DE102011101022B4 - Battery pack - Google Patents

Abstract

Battery pack, wherein the battery pack comprises a plurality of battery cells (11) and an arrangement for holding a plurality of battery cells (11), at least one device for electrically contacting at least one positive terminal of at least one battery cell (11) and at least one device for electrically contacting at least one negative terminal (25) of the at least one battery cell (11), wherein the arrangement for holding comprises at least one housing (1), at least one bottom-side holding device (5) and at least one top-side holding device (20), wherein the bottom-side holding device (5) is arranged on or forms a bottom side (3) of the housing (1), wherein the top-side holding device (20) is arranged on or forms a top side (2) of the housing (1), wherein the at least one device for electrically contacting a positive terminal electrically contacts at least one positive terminal of a battery cell (11), and wherein the at least one device for electrically contacting a negative terminal (25) at least one negative terminal (25) of the battery cell (11) is contacted, wherein the at least one device for electrically contacting a positive terminal or the at least one device for electrically contacting a negative terminal (25) is integrated into the bottom side (3) of the housing (1), characterized in that the bottom side (3) of the housing (1) is made of plastic, wherein the device for electrical contacting integrated into the bottom side (3) of the housing (1) is cast or injected into the bottom side (3) or the bottom-side retaining device (5), wherein the device for electrical contacting in the integrated state is at least partially encased by the bottom side (3), wherein the encasement has openings for electrical and thermal contacting of the device for electrical contacting, wherein the battery pack comprises at least one first cover plate (28), wherein the first cover plate (28) has predetermined breaking points (29) in areas corresponding to the receiving devices (6, 21) for receiving battery cells (11), wherein the battery pack comprises at least one further a cover plate (13) having a predetermined temperature resistance and/or fire resistance, wherein the first cover plate (28) and the further cover plate (13) are arranged on the lid side when the positive terminals of the battery cells (11) arranged in the housing (1) are oriented towards a lid side (2) or the first cover plate (28) and the further The cover plate (13) is arranged on the bottom side when the positive terminals of the battery cells (11) arranged in the housing (1) are oriented towards a bottom side (3).

Description

The invention relates to a battery pack.

There is a growing need in the automotive sector to develop alternatives to combustion engines that burn fossil fuels. One such alternative is electric or hybrid vehicles, which are powered entirely or partially by electricity. This electrical energy is stored in a traction battery and, in motor mode, is converted into mechanical drive energy by means of appropriate power electronics and an electric motor. In generator mode, the vehicle's kinetic energy can be converted into electrical energy, which is then stored in the traction battery.

A traction battery typically consists of multiple batteries or accumulators, also known as battery cells. These can be grouped into battery packs, with the traction battery comprising one or more such packs. High-voltage storage systems, such as those used to build traction batteries, utilize prismatic or cylindrical lithium-ion cells. A distinction is made between automotive cells and consumer cells. The 18650 cell, which is cylindrical, falls under the category of consumer cells. These 18650 cells are primarily used in electrical appliances in the white goods and household appliance industries. However, their use in automotive applications is also conceivable. For example, Tesla Motors uses 18650 form factor lithium-ion cells. Due to their intended application, these 18650 cells are small in terms of installation space and have a low capacity, but typically a high energy density. Because of the low capacity of the 18650 cells, it is necessary to electrically connect a large number of them to meet the requirements of a traction battery. This necessitates high process reliability in the electrical contacting of these multiple 18650 cells and corresponding tolerance compensation when arranging these cells in a battery pack. Furthermore, it is essential to prevent the spread of a fault in a battery pack or individual cell, which could, for example, lead to a thermal event such as a fire, to other cells or battery packs. Additional requirements include flexible electrical interconnection options between individual battery packs and their mounting to structural components of an electric or hybrid vehicle, as well as a lightweight design for the battery pack comprising the majority of battery cells.

The WO 2008/074034 A1 The document discloses a battery module comprising a plurality of battery cells. The battery module includes a housing, a bottom-side mounting device, and a top-side mounting device. At least the bottom-side mounting device has several receiving devices for battery cells. The battery cells can be arranged in these receiving devices. The document further discloses that a top-side mounting device has a larger receiving tolerance than the bottom-side mounting device. Therefore, so-called cell clamping plates are necessary for securing, in particular clamping, the battery cells. The document further discloses a busbar for electrically contacting the battery cells, which are not permanently integrated into the housing.

From the DE 10 2009 006 465 A1 A battery module is known comprising an electrical cell, a module housing that accommodates the electrical cell, and two or more contacting units attached to the module housing, each of which has at least two terminals.

From the DE 600 21 920 T2 A valve-regulated lead-acid battery cell with spiral plates is known.

• - ein unteres Gehäuse mit zwei oder mehr Taschen zur Aufnahme von Batterien,
• - ein oberes Gehäuse, das so konfiguriert ist, dass es mit dem unteren Gehäuse zusammenwirkt,
• - einen ersten Verbinder mit zwei oder mehr Leitern, die an ein elektronisches Gerät angeschlossen werden können,
• - ein elektrischer Schaltkreis, der so konfiguriert ist, dass, wenn zwei oder mehr Batterien alle in der gleichen Ausrichtung in die Taschen eingesetzt werden, am ersten Anschluss ein Potential bereitgestellt wird, das ungefähr der Summe der Spannung der in Reihe geschalteten Batterien entspricht, wobei der elektrische Schaltkreis eine elektrische Komponente aufweist in Reihe mit dem Anschluss und einer ersten Batterie, um zu verhindern, dass die erste Batterie eine zweite Batterie lädt/entlädt.

From the US 2007/0236170 A1 A battery housing is known to consist of:

• - a lower housing with two or more pockets for holding batteries,
• - an upper housing configured to interact with the lower housing,
• - a first connector with two or more conductors that can be connected to an electronic device,
• - an electrical circuit configured such that when two or more batteries are inserted into the pockets all in the same orientation, a potential is provided at the first terminal that is approximately equal to the sum of the voltages of the batteries connected in series, wherein the electrical circuit has an electrical component in series with the terminal and a first battery to prevent the first battery from charging/discharging a second battery.

From the CN 2016 38898 U Another battery pack is known as a traction battery for a motor vehicle.

From the DE 10 2009 012 180 A1 A battery pack for a power tool is known, consisting of at least one cell array with a plurality of individual cells arranged upright next to each other to form a cell container with a predetermined total number of cells, such that their cell axes are approximately perpendicular to a common reference plane, the cells being electrically contacted at their ends via cell connectors. Furthermore, the cell array of a cell container has a core cell located within a group of neighboring cells, the points where the cell axes of all neighboring cells intersect the reference plane on a closed, approximately elliptical curve, and the number of neighboring cells being more than one-third of the total number of cells in the cell container.

The technical problem is to create a battery pack and an arrangement for holding a plurality of battery cells that enables mechanically secure mounting of battery cells while simultaneously providing good electrical contactability, whereby the battery pack can be manufactured cost-effectively, with optimized weight and high process reliability, and at the same time offers improved protection against contact during and after the assembly with battery cells.

The solution to the technical problem arises from the subject matter with the features of claim 1. Further advantageous embodiments of the invention arise from the dependent claims.

A battery pack is proposed. The battery pack comprises a plurality of battery cells. In particular, the battery pack comprises a plurality of so-called 18650 cells, which may be lithium-ion cells. The battery pack may also include cells with a cell chemistry different from that of 18650 cells, for example, nickel-metal hydride cells. The battery cells may also have a form factor different from the 18650 form factor, for example, a 26650 form factor. The battery cells may be cylindrical or prismatic. However, other shapes, such as cuboids, are also possible. A battery cell, in this context, refers to a single battery or accumulator.

Furthermore, the battery pack comprises an arrangement for holding a plurality of battery cells, at least one device for electrically contacting a positive terminal of at least one battery cell of the plurality of battery cells, and at least one device for electrically contacting a negative terminal of at least one battery cell of the plurality of battery cells.

The battery pack in this context forms in particular a traction battery or part of a traction battery of an electric or hybrid vehicle, wherein electrical energy for driving the electric or hybrid vehicle can be stored in the battery cells of the battery pack.

The arrangement for holding the battery cells comprises at least one housing. The housing may, in particular, be cuboid in shape, with each cuboid having a top, a bottom, and four sides. The arrangement further comprises at least one bottom-side holding device and at least one top-side holding device. The bottom-side holding device is located on or forms the bottom of the housing. The bottom-side holding device may also have a plurality of receiving devices for holding battery cells.

The lid-side holding device is arranged on or forms one side of the lid of the housing. The lid-side holding device can also have multiple receiving devices for holding battery cells.

The majority of battery cells can be arranged between the bottom and top mounting devices. In particular, the majority of battery cells can be arranged in corresponding receiving devices of the top and bottom mounting devices. For example, a bottom end of a battery cell can be arranged on the top mounting device, in particular in a receiving device of the top mounting device, and a top end of the battery cell can be arranged on the bottom mounting device, in particular in a corresponding receiving device of the bottom mounting device.

Furthermore, the at least one device for electrically contacting a positive terminal contacts at least one positive terminal of a battery cell, which is preferably arranged in corresponding receiving devices of the lid-side and bottom-side holding devices. Similarly, the at least one device for electrically contacting a negative terminal contacts at least one negative terminal of the battery cell, which is preferably arranged in the corresponding receiving devices of the lid-side and bottom-side holding devices. The devices are arranged in the following configurations. Preferably, one device for electrically contacting a positive terminal, or several devices for electrically contacting a positive terminal, each contact one or more positive terminals of battery cells arranged in corresponding receiving devices. Similarly, one device for electrically contacting a negative terminal, or several devices for electrically contacting one or more negative terminals, contact at least one or more negative terminals of battery cells arranged in the corresponding receiving devices.

According to the invention, the at least one device for electrically contacting a positive terminal or the at least one device for electrically contacting a negative terminal is integrated into the bottom of the housing. The housing, in particular the bottom-side mounting device and optionally also the side walls, are made of plastic, for example by injection molding, wherein the device for electrical contacting is cast or injected into the bottom or the bottom-side mounting device of the housing. Preferably, the bottom is permanently connected to the side walls, for example, formed integrally with the side walls. The device for electrical contacting is integrated into the housing, in particular into its bottom, during the manufacturing or production of the housing. In the integrated state, the device for electrical contacting is at least partially enclosed by the bottom wall, the enclosure having openings for electrical and thermal contacting of the device for electrical contacting.

Preferably, the device for electrically contacting a positive pole is integrated into the bottom side of the housing.

The integration of the electrical contacting device advantageously results in improved protection against contact with the electrical contacting device during and after the housing is fitted with battery cells.

The battery pack further comprises at least one first cover plate, the first cover plate being arranged on the lid side if the positive terminals of the battery cells arranged in the housing, particularly in the mounting devices, are oriented towards a lid side. Alternatively, the first cover plate is arranged on the bottom side if the positive terminals of the battery cells arranged in the housing, particularly in the mounting devices, are oriented towards a bottom side of the housing. The first cover plate has predetermined breaking points or so-called burst zones in the areas corresponding to the mounting device. For example, the first cover plate may be perforated in the areas corresponding to the mounting device. Generally, the positive terminal side of a battery cell, particularly an 18650 cell, is considered the weakest structural element of the battery cell. In the event of a cell defect or cell damage, flames and/or solid particles can escape predominantly from this positive terminal side. To prevent flames or solid particles from escaping the battery cell or the battery pack, the first cover plate has predetermined breaking points in areas corresponding to the positive terminals of the battery cells arranged in the battery pack. In the event of a defect, flames and/or solid particles can penetrate the first cover plate in these areas and thus advantageously escape in a directed manner from an internal volume of the battery pack. This advantageously results in increased operational reliability of the battery pack according to the invention.

Furthermore, the battery pack has at least one additional cover plate, the additional cover plate being arranged on the lid side if the positive terminals of the battery cells arranged in the housing, particularly in the receiving devices, are oriented towards a lid side. Alternatively, the additional cover plate is arranged on the bottom side if the positive terminals of the battery cells arranged in the housing, particularly in the receiving devices, are oriented towards a bottom side. The additional cover plate has a predetermined temperature resistance and/or fire resistance. The additional cover plate can, for example, form an air channel, whereby flames and/or solid particles escaping from a battery cell can flow into the air channel, optionally through a predetermined breaking point in a first cover plate. The additional cover plate advantageously provides protection for further battery packs or other elements arranged in the electric or hybrid vehicle. This, in turn, results in increased operational reliability of the battery pack according to the invention.

In a further embodiment, the at least one device for electrically contacting at least one negative terminal of at least one battery cell is mechanically rigidly connected to the at least one negative terminal of the at least one battery cell, and/or the at least one device for electrically contacting at least one positive terminal of at least one battery cell is mechanically rigidly connected to the at least one positive terminal of the at least one battery cell. "Mechanically rigid" here means that no or only one Very little relative movement is possible between the battery cell and the electrical contacting device in the connected state.

Preferably, the at least one device for electrically contacting at least one negative terminal is connected to the at least one negative terminal of the at least one battery cell by means of a laser welding process, thereby mechanically connecting the battery cell to the device for electrically contacting the at least one negative terminal on its negative terminal side. For example, in a first step, the device for electrically contacting at least one negative terminal can be rigidly mechanically connected to the negative terminal, and then the assembly consisting of the device for electrically contacting the at least one negative terminal and the battery cell can be inserted into the housing from a cover side. In this case, the device for electrically contacting the at least one negative terminal thus forms at least part of the retaining device on the cover side.

In a second step, it is possible to connect the at least one device for electrically contacting at least one positive terminal to the at least one positive terminal of the at least one battery cell by means of a laser welding process, thereby mechanically connecting the battery cell to the device for electrically contacting the at least one positive terminal on the positive terminal side as well. This advantageously results in a clearly defined mechanical fit of the battery cell in the housing.

The mechanically rigid mounting advantageously results in good thermal contact of the battery cell in addition to good electrical contact. In particular, good thermal contact of a battery cell can be achieved on the negative terminal side, for example by arranging a heat sink on the electrical contact device of at least one negative terminal, which cools the battery cells on the negative terminal side via the electrical contact device of the at least one negative terminal.

Alternatively, in the second step, the at least one device for electrically contacting at least one positive terminal can be mechanically flexibly connected to the at least one positive terminal of the at least one battery cell, for example, by means of a wire bonding process. Mechanically flexible here means that relative movement between the battery cell and the device for electrical contacting is possible even when connected, which, for example, advantageously compensates for manufacturing tolerances in the positioning of the battery cells in the housing.

In a further embodiment, the bottom-side holding device has a plurality of receiving devices for receiving battery cells and the lid-side holding device has a plurality of receiving devices for receiving battery cells, wherein the plurality of battery cells are arranged in corresponding receiving devices of the lid-side and bottom-side holding devices.

The battery cell is not entirely contained within the corresponding mounting devices, but only its head and foot sections are. This advantageously allows a cooling fluid, such as air, to flow through the space between the battery cells arranged in the mounting devices.

The receiving device serves as a mechanical holder, in particular a mechanical fixation, of the battery cell arranged within it. The receiving device can be designed to adapt to the physical shape of the battery cell to be arranged within it. For example, if the battery cells to be arranged in the receiving device are cylindrical, the receiving device can have at least a partially circular cross-section, with the radius of the circle being selected based on the radius of the cylindrical battery cell.

The receiving devices prevent movement of the battery cells arranged within them relative to the housing, in particular to the wall sides, the lid side and the bottom side.

The receiving devices of the lid-side and/or bottom-side holding device each have at least one spring element. The spring element exerts a predetermined spring force on a battery cell arranged in the respective receiving device. This predetermined spring force serves as a holding force for the mechanical fixation of the battery cell. When a battery cell is arranged or inserted into a receiving device, the spring element can be deflected from its initial state, with the spring force exerted after arrangement or insertion being proportional to the deflection of the spring element during arrangement or insertion. In its initial state, the spring element may already be pre-tensioned.

The spring element advantageously enables a simple and resolvable solution. Mechanical fastening, fixing, and holding of a battery cell, which advantageously allows, for example, individual defective battery cells to be replaced without having to remove the remaining battery cells from their holders. The spring elements also enable the simplest and most secure mechanical fastening of the battery cells during a wire bonding process for the electrical connection of the positive and/or negative terminals of the battery cells to the corresponding electrical contact devices. For this purpose, the battery cells are first inserted into the holding devices on the bottom and/or top, and then the electrical connection is established using a wire bonding process.

The spring elements can be designed as part of the bottom and top retaining devices. For example, the spring elements can be formed together with the top or bottom retaining device in a single manufacturing step, such as an injection molding process.

The retaining device on the lid side and/or the retaining device on the bottom side can be designed, in particular, as a retaining or positioning grid. The retaining or positioning grid can form the receiving devices and the spring elements according to the invention. In particular, the receiving devices can be arranged in a honeycomb pattern on a surface of the retaining or positioning grid. The retaining or positioning grid preferably consists of plastic or a metal structure coated with an insulating material, e.g., plastic.

A bottom-mounted holding or positioning grid can have raised ribs above its surface, with the ribs forming edges or boundaries between individual receiving devices. Furthermore, the bottom-mounted holding or positioning grid can have openings, where one dimension, e.g., a diameter, of an opening is smaller than the outer dimensions, e.g., a diameter, of a battery cell. For example, the ribs described above can encompass a circular section of the surface of the bottom-mounted holding or positioning grid, where a radius or diameter of this circular section corresponds to a radius or diameter of, for example, a cylindrical battery cell. The ribs can be designed such that at least one section of a rib projects into the circular section of the surface encompassed by that rib. When a battery cell is inserted into the receiving device formed by the circular section of the surface and the ribs encompassing this section, the section of the rib projecting into the circular section is pressed radially outward. This section of the bridge represents a spring element according to the invention, which, after radial displacement, exerts a predetermined spring force on the battery cell inserted into the receiving device. The opening described above can be arranged in the area of the circular section of the surface of the bottom-side retaining or positioning grid, particularly in a central area. As explained in more detail below, electrical contact can be made through this opening with the battery cell arranged in the receiving device.

The described design of the bottom-side holding device advantageously enables cost-effective and simple manufacturing of the bottom-side holding device, in particular by means of an injection molding process.

Bridges can also encompass or delimit a rectangular or polygonal section of the surface of the bottom-side retaining or positioning grid.

A retaining or positioning grid on the lid side can have corresponding ribs or rib elements, the sections of which are also designed as spring elements. Preferably, however, the ribs comprise an opening in the retaining or positioning grid on the lid side. If the ribs of a receiving device are arranged, for example, along the circumference of a circular section of a surface of the retaining or positioning grid on the lid side, the ribs comprise a circular opening whose radius is equal to the radius of the circular section. If the radius of the opening corresponds to the radius of a cylindrical battery cell, the retaining or positioning grid on the lid side can be arranged between the lateral surfaces of battery cells and does not rest on, for example, a top or bottom surface of the battery cell. The resulting maximum opening advantageously improves the electrical contactability of the battery cell arranged in the receiving device.

Preferably, the battery cells are arranged in the battery pack such that the positive terminals of all battery cells in the battery pack are oriented towards the bottom and the negative terminals of the battery cells towards the top. It is also conceivable that the positive terminals of all battery cells in the battery pack are oriented towards the top and the negative terminals of these battery cells towards the bottom.

ZB can have multiple receiving devices on the bottom side only, wherein the positive terminals of the battery cells to be arranged therein are positioned in these receiving devices and are, for example, mechanically and flexibly connected to at least one device for electrically contacting at least one positive terminal. On the negative terminal side, the battery cells can be mechanically and rigidly connected to at least one device for electrically contacting at least one negative terminal. In this case, only the bottom-side receiving devices each have at least one spring element.

In a further embodiment, the at least one spring element of the receiving device of the bottom-side holding device and/or the at least one spring element of the receiving device of the top-side holding device exerts an axial spring force on the battery cell arranged in the receiving device. Preferably, only one receiving device of the bottom-side holding device has a spring element that exerts an axial spring force on the battery cell arranged in the receiving device. An axial spring force here refers to a spring force that is oriented perpendicular to a surface of the bottom-side holding device and/or top-side holding device. For example, the bottom-side holding device can have at least one spring tongue, with a free end of the spring tongue projecting beyond a surface of the bottom-side holding device. If, for example, circular sections of a surface of a bottom-side holding or positioning grid are encompassed by previously described webs, such spring tongues can be arranged in the circular section of the surface of the holding or positioning grid encompassed by the webs. Preferably, several, for example three, spring elements exerting an axial spring force are arranged in this circular area. The spring tongues can, for example, have an L-shaped profile in cross-section, with a first leg arranged in a plane of the surface of the bottom-side holding device and a second leg projecting out of this surface of the bottom-side holding device. The bottom-side holding device is arranged with respect to the housing such that the free end of the spring tongue projects into an internal volume of the housing. When a battery cell is inserted into the receiving device, with a top or bottom surface of the battery cell bearing against at least a portion of the surface of the bottom-side holding device in the area of the receiving device, the spring tongue is deflected against a spring force of this spring tongue, thereby exerting a predetermined spring force on the battery cell in the axial direction when the battery cell is inserted.

This advantageously results in a simple device for axially fixing a battery cell, which prevents the battery cell from slipping relative to the bottom and top sides when the battery cell is clamped.

A retaining or positioning grid on the lid side can also have or form such spring tongues. However, this is only possible if the openings of a retaining or positioning grid described above have a smaller dimension, for example a smaller diameter, than the external dimensions, for example diameter, of the battery cells to be inserted into the receiving devices of the retaining or positioning grid on the lid side.

In a further embodiment, the at least one spring element or a further spring element of the receiving devices of the bottom-side holding device and/or the at least one spring element or a further spring element of the receiving devices of the top-side holding device exerts a radial spring force on the battery cell arranged in the receiving device. A radial spring force here refers to a spring force with a direction parallel to a surface of the bottom-side and/or top-side holding device. In particular, the radial spring force and the axial spring force described above form a right angle. Such a spring element, which exerts a radial spring force, can, for example, as described above, be designed as a section of a web raised from a surface of the bottom-side or top-side holding device, in particular from a surface of a bottom-side holding or positioning grid or a top-side holding or positioning grid. Such spring elements advantageously prevent the battery cell arranged in the receiving device from slipping relative to the side walls of the housing.

Preferably, a receiving device of the bottom-side holding device has at least one spring element which exerts an axial spring force on the battery cell arranged in the receiving device, and at least one further spring element which exerts a radial spring force on the battery cell arranged in the receiving device.

Preferably, a corresponding receiving device of the lid-side holding device has one or more spring elements that exert exclusively a radial spring force on the battery cell arranged in the receiving device.

In a further embodiment, the housing has at least one partition wall, wherein the at least one partition wall divides an internal volume of the housing into at least two battery chambers. A predetermined number of battery cells can be arranged in each chamber. The battery cells arranged in a battery chamber can also be referred to as a sub-package. This advantageously results in a spatial separation of sub-packages as well as improved mechanical and/or thermal insulation of battery cells from different sub-packages. In particular, battery cells of a sub-package can be connected electrically in parallel and different sub-packages can be connected electrically in series. This advantageously allows a battery pack to be divided into sub-packages, which in turn comprise several battery cells, in such a way that a desired capacity of the battery pack can be ensured.

In a further embodiment, the at least one device for electrically contacting a positive terminal is designed as a positive-pole contact plate, wherein the positive-pole contact plate is arranged on the lid side or the bottom side, and the positive terminals of at least a first number of battery cells arranged in the housing, in particular in the receiving devices, are electrically connected to the positive-pole contact plate. If the positive terminals of battery cells arranged in the battery pack are oriented towards a bottom side, the at least one positive-pole contact plate is integrated into a bottom side of the housing. If the battery cells are arranged in the battery pack such that the positive terminals of the battery cells are oriented towards a lid side, the at least one positive-pole contact plate is arranged on a lid side. The contact plate here contacts the positive terminals of several battery cells arranged in the housing, in particular in the receiving devices, which are thus electrically connected in parallel. Electrical contact between the battery cells and the positive-pole contact plate is preferably achieved by means of a bonding process, in particular a wire bonding process. The electrical contact is advantageously made through the openings described above in the holding device on the bottom and/or lid side.

Alternatively or cumulatively, the at least one device for electrically contacting a negative pole is designed as a negative pole-side contact plate, wherein the negative pole-side contact plate is arranged on the lid side or the bottom side and negative poles of at least a further number of battery cells arranged in the housing, in particular in the receiving devices, are electrically connected to the negative pole-side contact plate.

Preferably, the negative terminals of all battery cells arranged in the battery pack can be electrically contacted by means of a negative-terminal contact plate, which is, for example, located on the lid side. Also, particularly in this case, the positive terminals of all battery cells arranged in the battery pack can be electrically contacted by means of a positive-terminal contact plate integrated into a base side. The negative-terminal contact plate can be rigidly or flexibly connected to the negative terminals. The positive-terminal contact plate is preferably flexibly connected to the positive terminals. The contact plates can be electrically connected, for example, to external connection points integrated into the housing (e.g., injection-molded or cast in) or arranged on the housing, by means of which the battery pack can be electrically connected, for example, to a traction network of an electric or hybrid vehicle. By designing the electrical contact devices as contact plates, a simple connection of a plurality of battery cells arranged in the battery pack is advantageously achieved.

In a further embodiment, the battery pack has a positive-pole and a negative-pole contact plate for each battery chamber. The positive-pole contact plate for each battery chamber is located on the lid side or integrated into the bottom side of the battery chamber, with the positive terminals of all battery cells arranged in, and in particular in, the receiving devices of, the respective battery chamber being electrically connected to the positive-pole contact plate. The negative-pole contact plate is similarly integrated into the bottom side or located on the lid side of the battery chamber, with the negative terminals of all battery cells arranged in, and in particular in, the receiving devices of, the battery chamber being electrically connected to the negative-pole contact plate. If the battery cells of the respective battery chamber are arranged in the housing such that the positive terminals of the battery cells are oriented towards a lid side, the positive-pole contact plate is located on the The battery cells are arranged on the top side of the housing. In this case, the negative terminal contact plate is integrated into the bottom side of the housing. If the battery cells are arranged in reverse within the battery chamber, the negative terminal contact plate is located on a top side of the housing, and the positive terminal contact plate is integrated into the bottom side of the housing. This advantageously results in the simplest possible electrical contact for all battery cells in a sub-package, i.e., all battery cells in a battery chamber. All battery cells in this sub-package are electrically connected in parallel.

In a further embodiment, a negative-terminal contact plate of at least one first battery chamber is electrically connected to a positive-terminal contact plate of a battery chamber adjacent to the first battery chamber. Alternatively, a positive-terminal contact plate of at least one battery chamber can be electrically connected to a negative-terminal contact plate of a battery chamber adjacent to the first battery chamber. This advantageously makes it possible to connect battery cell subsets, comprising electrically parallel-connected battery cells, in series. For this purpose, the positive-terminal and/or negative-terminal contact plates can have or form contact tongues. A contact tongue can, for example, project perpendicularly from a surface of the contact plate and have an angled or S-shaped profile. This advantageously makes it possible, on the one hand, to electrically connect a contact plate integrated in the bottom side to a contact plate of an adjacent battery chamber arranged on the lid side, wherein the contact plate of the adjacent battery chamber is arranged laterally offset from the first contact plate in the housing. Preferably, the contact plates or the contact tongues formed by the contact plates can be electrically connected by means of a laser welding process. The contact tongue(s) can also be integrated into the housing, in particular into the housing walls, especially by injection molding or casting.

This allows for the advantageous creation of a battery pack that has a desired capacity and a desired output voltage.

Furthermore, the housing can have devices for accommodating temperature sensors and/or electrical connection points, or these devices can be integrated into the housing. The electrical connection points can be electrically connected to a contact plate on the positive or negative terminal side. Advantageously, these connection points enable external electrical contacting of the battery pack according to the invention, for example, connection to a traction network of an electric or hybrid vehicle.

Furthermore, it is advantageous that temperature sensors for monitoring the operating temperature of battery cells can be arranged in the housing.

Overall, the proposed integration of the individual elements of the proposed battery pack advantageously reduces the required installation space, weight, and/or assembly time. Furthermore, functional safety during manufacturing and assembly of the battery pack can be advantageously increased by incorporating contact protection for the contact plates. Additionally, series connection of sub-packages can also be implemented with extensive contact protection.

• 1 eine perspektivische Darstellung eines Gehäuses,
• 2 eine weitere perspektivische Darstellung des in 1 gezeigten Gehäuses,
• 3a eine erste minuspolseitige Kontaktierungsplatte,
• 3b eine zweite minuspolseitige Kontaktierungsplatte,
• 3c eine dritte minuspolseitige Kontaktierungsplatte,
• 4 eine perspektivische Darstellung eines Gehäuses mit deckelseitiger Halteeinrichtung,
• 5 eine deckelseitige Halteeinrichtung,
• 6 eine perspektivische Darstellung eines Gehäuses mit eingesetzten Batteriezellen,
• 7 eine perspektivische Darstellung eines Gehäuses mit eingesetzten pluspolseitigen Kontaktierungsplatten,
• 8a eine erste pluspolseitige Kontaktierungsplatte,
• 8b eine zweite pluspolseitige Kontaktierungsplatte,
• 8c eine dritte pluspolseitige Kontaktierungsplatte,
• 9 eine perspektivische Darstellung eines Gehäuses mit einer ersten Abdeckplatte,
• 10 eine perspektivische Darstellung eines Gehäuses mit einer weiteren Abdeckplatte,
• 11 einen Querschnitt durch das in 10 dargestellte Batteriepaket,
• 12 eine perspektivische Darstellung eines Ausschnitts eines Gehäuses und
• 13 eine weitere perspektivische Darstellung eines Ausschnitts eines Gehäuses.

The invention is explained in more detail using an exemplary embodiment. The figures show:

• 1 a perspective view of a housing,
• 2 another perspective view of the in 1 shown case,
• 3a a first contact plate on the negative terminal side,
• 3b a second contact plate on the negative terminal side,
• 3c a third contact plate on the negative terminal side,
• 4 a perspective view of a housing with a lid-side holding device,
• 5 a lid-side holding device,
• 6 a perspective view of a housing with inserted battery cells,
• 7 a perspective view of a housing with inserted positive-pole contact plates,
• 8a a first contact plate on the positive terminal side,
• 8b a second contact plate on the positive terminal side,
• 8c a third contact plate on the positive terminal side,
• 9 a perspective view of a housing with a first cover plate,
• 10 a perspective view of a housing with an additional cover plate,
• 11 a cross-section through the in 10 battery pack shown,
• 12 a perspective view of a section of a housing and
• 13 Another perspective view of a section of a housing.

In the following, identical reference symbols denote elements with the same or similar technical characteristics.

In 1 A housing 1 is shown. The housing has a cover 2, a bottom 3, and four wall sides 4. The housing 1 is cuboid in shape. A bottom-side retaining device 5 is arranged on the bottom 3 of the housing 1, forming the bottom 3 of the housing 1. The bottom-side retaining device 5 has a plurality of receiving devices 6, wherein in 1 Only one such receiving device 6 is designated as an example. On the bottom side 3, further positive-pole contact plates 7a, 7b, 7c are arranged, which are, for example, 2 and 3 are shown. A second negative-pole contact plate 7b and a third negative-pole contact plate 7c have contact tongues 8b, 8c (see also 3b and 3c ) on, whose ends in 1 The positive terminal contact plates 7a, 7b, 7c are integrated into the bottom side 3 and the contact tongues 8b, 8c are integrated into the side walls of the housing 1, in particular cast in place. Furthermore, the housing 1 has connection contacts 9 for electrical contacting, the connection contacts 9 being arranged on opposite side walls 4. The housing 1 and the bottom-side retaining device 5 serve to accommodate cylindrical battery cells 11, which are, for example, in 6 are shown. Threaded holes 12 are provided on the edges of the housing 1, which are used to screw the housing 1 to, for example, a 10 The additional cover plate 13 shown serves as a means of communication. Furthermore, temperature sensors 10 are arranged in the side walls 4 of the housing 1. Also shown are contact surfaces 22 on the side walls 4, the function of which is explained in more detail below.

Furthermore, in 1 shown that the housing 1 has partitions 15 which divide an internal volume 16 of the housing 1 into a first battery chamber 17a, a second battery chamber 17b, a third battery chamber 17c, a fourth battery chamber 17d and a fifth battery chamber 17e.

In 2 is that in 1 The housing 1 is shown in perspective, with the housing 1 depicted transparently to reveal a first positive-pole contact plate 7a, a second positive-pole contact plate 7b, and a third positive-pole contact plate 7c. The positive-pole contact plates 7a, 7b, 7c and the contact tongues 8b, 8c of the second and third positive-pole contact plates 7b, 7c, which are also shown, are cast into the housing 1. The positive-pole contact plates 7a, 7b, 7c are located below the housing 1. 1 arranged in the bottom-side holding device 5 shown.

In 1 and 2 It is shown that receiving devices 6 of the bottom-side holding device 5 each have an opening 14, wherein an electrical contact between negative poles 25 of the e.g. in 6 shown battery cells 11 and the positive terminal contact plates 7a, 7b, 7c can be bonded, for example by means of a wire bonding process.

Out of 2 It is evident that the first positive-pole contact plate 7a is assigned to a first battery chamber 17a, wherein the first positive-pole contact plate 7a electrically contacts the positive poles of all battery cells 11 arranged in the first battery chamber 17a. Similarly, the second positive-pole contact plates 7b are assigned to a second, third, and fourth battery chamber 17b, 17c, 17d, and the third positive-pole contact plate 7c to a fifth battery chamber 17e.

In 3a A first positive-pole contact plate 7a is shown. The external dimensions of this first positive-pole contact plate are similar to the shape of the first battery chamber 17a (see 2 ) adapted. A first number of battery cells 11 (see) are connected by means of the first positive-pole-side contact plate 7a. 6 ) electrically contactable, in particular their positive poles. For this purpose, the first positive-pole-side contacting plate 7a has so-called bonding sections 18.

In 3b and 3c A second positive-pole-side contact plate 7b and a third positive-pole-side contact plate 7c are shown. These have the same features as the first positive-pole-side contact plate 7a (see 3a) Bonding sections 18 for electrical contacting in battery chambers 17b, 17c, 17d or in a fifth battery chamber 17e (see 2 ) arranged battery cells 11 (see 6 ). Furthermore, the second and third positive-pole contact plates 7b, 7c each have contact tongues 8b, 8c. The contact tongues extend perpendicular to a surface of the positive-pole contact plates. The contact tongues 8b, 8c are located on the positive-pole contact plates 7b, 7c and thus protrude perpendicularly from the surface of the positive-pole contact plate 7b, 7c. A first tongue end is positioned on the positive-pole contact plate 7b, 7c. A free, second tongue end is positioned laterally and vertically offset from the first tongue end. For this purpose, the contact tongues 8b, 8c have a curved profile. By positioning the contact tongues 8b, 8c perpendicular to the positive-pole contact plate 7b, 7c, a desired vertical distance between the second, free tongue end and the first tongue end, i.e., from the surface of the positive-pole contact plate 7b, 7c, is achieved. The curved profile achieves a desired lateral offset of the second, free tongue end relative to the first tongue end. As described in [reference to relevant section], the contact tongues 8b, 8c can be used to [further details to be added]. 1 shown are negative terminal contact plates 19a, 19b, 19c, which are arranged on the cover side of the housing 1 (see 7 ) can be contacted. For example, a first negative-pole-side contact plate 19a, located on the lid side and assigned to the first battery chamber 17a, can be contacted by means of the contact tongue 8b of the second positive-pole-side contact plate 7b, which is assigned to the second battery chamber 17b. This advantageously allows for a series connection of electrically parallel-connected battery cells 11 of a battery chamber 17a, 17b, 17c, 17d, 17e.

Furthermore, the positive-pole contact plates 7a, 7b, 7c have circular holes 26 through which, as explained in more detail below, flames or solid particles can escape from battery cells 11 in the event of a defect. The holes 26 of the positive-pole contact plates 7a, 7b, 7c correspond to the positive terminals of the battery cells 11 inserted into the receiving devices 6, 21. The holes 26 also provide access to the positive terminals for electrical contact.

In 4 Figure 1 shows a perspective view of a housing 1 with an inserted lid-side retaining device 20. The lid-side retaining device 20 has honeycomb-arranged receiving elements 21, of which only one receiving element 21 is provided with a reference numeral as an example. The receiving element is designed as a hollow retaining cylinder. The diameter of one retaining cylinder is equal to or approximately equal to the diameter of a battery cell 11 (see Figure 1). 6 The retaining cylinders form receiving devices 21 of the lid-side retaining device 20. Each lid-side receiving device 21 corresponds to a receiving device 6 of the bottom-side retaining device (see 1 ). Correspondence can mean, for example, that a central axis of the receiving device 21 of the cover-side holding device 20 is equal to a central axis of the receiving device 6 of the bottom-side holding device 5. The cover-side holding device 20 is thereby attached to a cover side 2 of the housing 1 (see 1 ) placed. For this purpose, the housing 1 can have support surfaces 22 arranged on the side walls 4, onto which side webs 23 of the lid-side holding device 20 can be placed.

In 5 A lid-side holding device 20 is shown in isolation. It is shown that receiving devices 21, each belonging to a specific battery chamber 17a, 17b, 17c, 17d, 17e (see 2 ) are assigned, lie flush against each other. Connecting webs 24 are arranged between receiving devices 21 of adjacent battery chambers 17a, 17b, 17c, 17d, 17e, which ensure that the e.g. in 1 The partition walls shown can run as follows: 15.

In 6 A housing 1 with inserted battery cells 11 is shown. A retaining device 20 on the lid is also shown. 6 It is evident that the foot-side end sections of the battery cells 11 differ from those in 5 The battery cells are enclosed in the depicted receiving devices 21, which are designed as retaining cylinders. The end sections of the battery cells 11 at the head end, which are not shown, are enclosed in the receiving devices 21 when installed. 1 The battery cells are arranged in the bottom-side receiving devices 6 shown. In such a state, relative movements of the battery cells 11 with respect to the wall sides 4 are prevented. 6 The figure shows that the negative terminals 25 of the battery cells 11 are arranged on the top side, which necessarily means that the positive terminals of the battery cells 11 are arranged on the bottom side. Thus, a bottom-side end section or shell section of battery cells 11 denotes a negative-terminal end section of these battery cells 11, and a top-side end section or shell section of battery cells 11 denotes a positive-terminal end section of battery cells 11.

In 7 is a housing 1 with inserted battery cells 11 (see 6 ) and inserted negative-pole contact plates 19a, 19b, 19c, which are also in 8a , 8b , 8c The diagrams are shown. A first negative-terminal contact plate 19a is assigned to a first battery chamber 17a. Second negative-terminal contact plates 19b are each assigned to a second, a third, and a fourth battery chamber 17b, 17c, and 17d, respectively. A third negative-terminal contact plate 19c is assigned to a fifth battery chamber 17e. The external dimensions of the negative-terminal contact plates 19a, 19b, are shown. 19c is adapted to the shape of the respective battery chambers 17a, 17b, 17c, 17d, 17e. The negative terminal contact plates 19a, 19b, 19c are pressed onto the lid side of the 6 The battery cells 11 shown are placed on the lid-side holding device 20. With respect to the housing 1, the negative terminal contact plates 19a, 19b, 19c are thus arranged above the lid-side holding device 20.

In 8a A first negative-pole contact plate 19a is shown. This is, as in 7 evidently, assigned to a first battery chamber 17a. The first negative-pole contact plate 19a has, analogous to the one in 3a The first positive-pole-side contact plate 7a has bonding sections 18. The first negative-pole-side contact plate 19a connects negative poles 25 (see 6 All battery cells 11 arranged in the first battery chamber 17a can be contacted simultaneously, the battery cells 11 arranged in the first battery chamber 17a being electrically connected in parallel. The negative-pole contact plates 19a, 19b, 19c also have circular holes 26, which serve for the exit of flames and/or solid particles and for the accessibility of the negative poles 25 for electrical contact.

8b shows a second negative-pole-side contact plate 19c and 8c a third negative-pole contact plate 19b. These also have, analogous to the first one in 8a The first negative-pole contact plate 19a has bonding sections 18 and holes 26. The first and second negative-pole contact plates 19a, 19b each have a contact section 27a, 27b.

As from 7 As can be seen, for example, the first negative-pole contact plate 19a is contacted by means of the contact section 27a with a free end of a contact tongue 8b of a second positive-pole contact plate 7b, and the second negative-pole contact plates 19b are contacted by means of their contact sections 27b with free ends of contact tongues 8b, 8c of a second and a third positive-pole contact plate 7b, 7c. From the overall view of 2 and 7 This results in the electrically parallel connected battery cells 11 of the first battery chamber 17a being connected in series to the electrically parallel connected battery cells 11 of the second battery chamber 17b.

In 9 A housing 1 with a first cover plate 28 arranged on its bottom is shown. With respect to the housing 1, the first cover plate 28 is arranged below the positive-pole contact plates 7a, 7b, 7c. In the area of the positive terminals of battery cells 11 arranged in the housing 1 (see 6 The first cover plate 28 has predetermined breaking points 29 or burst points, with only one predetermined breaking point 29 being shown as an example. The first cover plate 28 is perforated in the area of the predetermined breaking point 29. If, in the event of a defect, flames and/or solid particles escape from the positive terminal of a battery cell 11, the first cover plate 28 will break open in the area of the predetermined breaking point 29, thus allowing the flames and/or solid particles to escape in a directed manner.

In 10 Figure 1 shows a perspective view of a housing 1 with an additional cover plate 13, the additional cover plate 13 being located at the bottom. With respect to the housing 1, the additional cover plate 13 is below the first cover plate 28 (see Figure 2). 9 The first cover plate 13 has holes 30 at its edges or corners, which, when the second cover plate 13 is placed on the housing 1, align with holes in the housing 1. The second cover plate 13 can be screwed onto the housing 1 via these holes 30. The second cover plate 13 is made of refractory material and has a predetermined temperature resistance.

On the lid side, a pressure plate (not shown) can be attached using the [unclear] 1 The holes 12 shown are screwed onto the housing 1. When screwed on, the pressure plate generates a contact force which is transmitted via the pressure plate and the negative-pole contact plates 19a, 19b, 19c (see 7 ) on the battery cells 11 arranged in the housing 1 (see 6 ) is exerted. Thus, relative movement towards a cover side 2 or a bottom side 3 of the battery cells 11 is also prevented. The contact force presses particularly in 12 The illustrated spring tongues 36 of bottom-side receiving devices 6 from a starting position of these spring tongues.

In 11 is a cross-section through the in 10 The housing is shown. It is shown that an air channel 31 is formed between a further cover plate 13 and a first cover plate 28. In the event of a defect, a flame and/or solid particles from a battery cell 11, which escape from a positive terminal of the battery cell 11, can enter this air channel 31 through the first cover plate 28, particularly in the area of a predetermined breaking point 29 (see figure). 9 ) escape. Further on is in 11 The lid-side holding device 20 and the bottom-side holding device 5 are shown, as well as the positive-pole-side contact plates 7a, 7b, 7c and the negative-pole-side contact plates 19a, 19b, 19c. A cooling element 32 is also shown. The battery cells 11 are arranged on the lid side of the housing 1. The arrangement of the battery cells 11 in corresponding receiving devices 6, 21 of the bottom-side and lid-side holding devices 5, 20 results in a free space 33 between the battery cells 11. This free space can be used, for example, for a cooling fluid to flow between the battery cells 11.

In 12 Figure 1 shows a perspective view of a section of a housing 1, where the housing 1 is only partially equipped with battery cells 11. In particular, Figure 1 shows 12 The detailed design of the bottom-side holding device 5. The bottom-side holding device 5 has several receiving elements 6. The receiving elements 6 are bounded by webs 34 that encompass circular sections of a surface of the bottom-side holding device 5. The webs 34 do not completely encompass the circular sections of the surface of the bottom-side holding device 5. One diameter of the circular sections is equal to or approximately equal to the diameter of the battery cells 11. A first section 35a of a first web 34 extends along a circumference of the circular section. A further section 35b of the web 34 projects into the circular section. This further section 35b is designed as a spring element. If a battery cell 11 is inserted into the circular section that forms part of the receiving device 6, the further section 35b is pushed out of the circular section and exerts a spring force, determined by its spring stiffness and deflection, on the battery cell 11 in a direction parallel to a surface of the bottom-side holding device 5. The further section 35b exerts a radial spring force on the battery cell 11 and thus mechanically secures it.

Further shown are spring tongues 36, which are arranged freely in the surface of the bottom-side retaining device 5. Here, a free end of the spring tongues 36 projects into an internal volume 16 (see 1 ) of the housing 1. When the battery cell 11 is inserted into the receiving device 6 of the bottom-side holding device 5 and force is exerted on the battery cell 11 from a cover side 2 towards the bottom side 3, for example, a clamping force by screwing the further cover plate 13 to the housing 1, a free end of the spring tongues 36 of the circular section 6 is pressed out of the inner volume 16 towards an outer volume (not shown). Due to mechanical properties and the deflection, the spring tongue 36 then exerts a spring force in the axial direction, i.e., perpendicular to a surface of the bottom-side holding device 5, on the battery cell 11. It is further shown that a receiving device 6 of the bottom-side holding device 5 has a circular opening 37, wherein the circular opening 37 has a smaller diameter than a battery cell 11. Thus, a negative terminal end of the battery cell 11 can be placed flat on the surface of the bottom-side holding device 5 in the area of the receiving devices 6.

In 13 is the in 12 The illustrated section of the housing 1 is shown, in particular a further embodiment of the lid-side retaining device 20 is shown. Analogous to the bottom-side retaining device 5, the lid-side retaining device 20 has webs 38. The webs 38 encompass a circular opening 39 of the lid-side retaining device 20, wherein a first section 40a of a web 38 extends along a circumference of the circular opening 39 and a further section 40b of the web 38 projects into the circular opening 39. A radius of the opening 39 is equal to or approximately equal to a radius of a battery cell 11. When the lid-side retaining device is placed on the lid side of the housing 1, the webs 38 enclose or encompass a foot- or positive-pole-side end section or shell section of battery cells 11. Analogous to the further sections 35b of the webs 34 (see 12 ) the further subsections 40b are pushed out of the circular opening 39 by the battery cell 11 and, in the inserted state of the battery cells 11, exert a spring force parallel to a surface of the lid-side holding device 20 on the battery cells 11.

In this case, the further subsections 35b, 40b of the webs 34, 38 can be designed to float freely above the surface of the bottom and top-side holding device 5, 20.

Reference symbol list

1

Housing

2

Cover side

3

bottom

4

side wall

5

floor-mounted holding device

6

Reception facility

7a

first positive terminal contact plate

7b

second positive-pole contact plate

7c

third positive-pole contact plate

8b

Contact tongue

8c

Contact tongue

9

Connection contacts

10

temperature sensor

11

Battery cell

12

Hole, threaded hole

13

additional cover plate

14

opening

15

partition

16

Internal volume

17a

first battery chamber

17b

second battery chamber

17c

third battery chamber

17d

fourth battery chamber

17e

fifth battery chamber

18

Bonding connection point

19a

first negative terminal contact plate

19b

second negative terminal contact plate

19c

third negative terminal contact plate

20

Lid-side holding device

21

Reception facility

22

Contact surface

23

Sidebar

24

Connecting bridge

25

negative terminal

26

opening

27a

Contact section

27b

Contact section

28

first cover plate

29

predetermined breaking point

30

opening

31

air duct

32

Cooling element

33

open space

34

web

35a

first section

35b

further subsection

36

spring tongue

37

opening

38

web

39

opening

40a

first section

40b

further subsection

Claims (9)

Battery pack, wherein the battery pack comprises a plurality of battery cells (11) and an arrangement for holding a plurality of battery cells (11), at least one device for electrically contacting at least one positive terminal of at least one battery cell (11) and at least one device for electrically contacting at least one negative terminal (25) of the at least one battery cell (11), wherein the arrangement for holding comprises at least one housing (1), at least one bottom-side holding device (5) and at least one top-side holding device (20), wherein the bottom-side holding device (5) is arranged on or forms a bottom side (3) of the housing (1), wherein the top-side holding device (20) is arranged on or forms a top side (2) of the housing (1), wherein the at least one device for electrically contacting a positive terminal electrically contacts at least one positive terminal of a battery cell (11), and wherein the at least one device for electrically contacting a negative terminal (25) at least one negative terminal (25) of the battery cell (11) is contacted, wherein the at least one device for electrically contacting a positive terminal or the at least one device for electrically contacting a negative terminal (25) is integrated into the bottom side (3) of the housing (1), characterized in that the bottom side (3) of the housing (1) is made of plastic, wherein the device for electrical contacting integrated into the bottom side (3) of the housing (1) is cast or injected into the bottom side (3) or the bottom-side retaining device (5), wherein the device for electrical contacting in the integrated state is at least partially encased by the bottom side (3), wherein the encasement has openings for electrical and thermal contacting of the device for electrical contacting, wherein the battery pack comprises at least one first cover plate (28), wherein the first cover plate (28) has predetermined breaking points (29) in areas corresponding to the receiving devices (6, 21) for receiving battery cells (11), wherein the battery pack comprises at least one further cover plate (13) which has a predetermined temperature resistance and/or fire resistance the first cover plate (28) and the further cover plate (13) are arranged on the lid side if the positive terminals of the battery cells (11) arranged in the housing (1) are oriented towards a lid side (2) or the first cover plate (28) and the further cover plate (13) are arranged on the bottom side if the positive terminals of the battery cells (11) arranged in the housing (1) are oriented towards a bottom side (3). Battery pack after Claim 1 , characterized in that the at least one device for electrically contacting at least one negative pole (25) of at least one battery cell (11) is mechanically rigidly connected to the at least one negative pole (25) of the at least one battery cell (11) and/or the at least one device for electrically contacting at least one positive pole of at least one battery cell (11) is mechanically rigidly connected to the at least one positive pole of the at least one battery cell (11). Battery pack according to one of the preceding claims, characterized in that the bottom-side holding device (5) has a plurality of receiving devices (6) for receiving battery cells (11) and the top-side holding device (20) has a plurality of receiving devices (21) for receiving battery cells (11), wherein the plurality of battery cells (11) are arranged in corresponding receiving devices (6, 21) of the top-side and bottom-side holding device (5, 20), wherein the receiving devices (6, 21) of the top-side and/or bottom-side holding device (5, 20) each have at least one spring element which exerts a predetermined spring force on a battery cell (11) arranged in the respective receiving device (6, 21). Battery pack after Claim 3 , characterized in that the at least one spring element exerts an axial spring force on the battery cell (11) arranged in the receiving device (6, 21). Battery pack after one of the Claims 3 or 4 , characterized in that the at least one spring element or a further spring element exerts a radial spring force on the battery cell (11) arranged in the receiving device (6, 21). Battery pack after one of the Claims 1 until 5 , characterized in that the housing (1) has at least one partition (15), wherein the at least one partition (15) divides an internal volume (16) of the housing (1) into at least two battery chambers (17a, 17b, 17c, 17d, 17e). Battery pack after one of the Claims 1 until 6 , characterized in that the at least one device for electrically contacting a positive terminal is designed as a positive-pole-side contact plate (7a, 7b, 7c), wherein the positive-pole-side contact plate (7a, 7b, 7c) is arranged on the cover side (2) and positive terminals of at least a first number of battery cells (11) are electrically connected to the positive-pole-side contact plate (7a, 7b, 7c), and the at least one device for electrically contacting a negative terminal (25) is designed as a negative-pole-side contact plate (19a, 19b, 19c), wherein the negative-pole-side contact plate (19a, 19b, 19c) is arranged on the bottom side (3) and negative terminals (25) of at least a further number of battery cells (11) are electrically connected to the negative-pole-side contact plate (19a, 19b, 19c), or that the at least one device for electrically contacting a positive terminal as positive terminal contact plate (7a, 7b, 7c) is formed, wherein the positive terminal contact plate (7a, 7b, 7c) is arranged on the bottom side (3) and positive terminals of at least a first number of battery cells (11) are electrically connected to the positive terminal contact plate (7a, 7b, 7c), and the at least one device for electrically contacting a negative terminal (25) is formed as a negative terminal contact plate (19a, 19b, 19c), wherein the negative terminal contact plate (19a, 19b, 19c) is arranged on the cover side (2) and negative terminals (25) of at least a further number of battery cells (11) are electrically connected to the negative terminal contact plate (19a, 19b, 19c). Battery pack after Claim 7 , characterized in that the battery pack has a positive terminal side and a negative terminal side contact plate (7a, 7b, 7c, 19a, 19b, 19c) for each battery chamber (17a, 17b, 17c, 17d, 17e), wherein the positive terminals of all battery cells (11) arranged in the battery chamber (17a, 17b, 17c, 17d, 17e) are electrically connected to the positive terminal side contact plate (7a, 7b, 7c) and the negative terminals (25) of all battery cells (11) arranged in the battery chamber (17a, 17b, 17c, 17d, 17e) are electrically connected to the negative terminal side contact plate (19a, 19b, 19c). Battery pack after Claim 8 , characterized in that a positive-pole-side contact plate of at least one first battery chamber (17a) is electrically connected to a negative-pole-side contact plate of a battery chamber (17b) adjacent to the first battery chamber (17a) or a negative-pole-side contact plate (19a) of at least one first battery chamber (17a) is electrically connected to a positive-pole-side contact plate of a battery chamber (17b) adjacent to the first battery chamber (17a) The contact plate (7b) is electrically connected to the battery chamber (17b) adjacent to the first battery chamber (17a).