DE102015008985A1 - Cell module, battery module and electric battery - Google Patents

Abstract

The invention relates to a cell module (1) for an electric battery (2) having - a plurality of individual cells (1.1), - at least two cell pole connectors (1.2, 1.3), by means of which the individual cells (1.1) are electrically connected in parallel or in series with one another, and - at least one tempering element (4) for tempering the individual cells (1.1). According to the invention, it is provided that the at least one tempering element (4) is thermally conductively connected to a first cell pole connector (1.2), wherein - each individual cell (1.1) is electrically and thermally conductively connected to the first cell pole connector (1.2) and - the at least one tempering element (4) has two sections (4.1, 4.2) arranged at right angles to one another, wherein a first section (4.1) is arranged parallel to a flat side of the first cell pole connector (1.2) and perpendicular to a longitudinal orientation of the individual cells (1.1), and wherein a second section (4.2) is arranged parallel to the longitudinal orientation of the individual cells (1.1). Furthermore, the invention relates to a battery module (3) comprising a plurality of cell modules (1) connected electrically in series with one another and an electric battery (2) comprising at least one such battery module (3).

Description

The invention relates to a cell module for an electric battery according to the preamble of claim 1. The invention further relates to a battery module having a plurality of such cell modules and an electric battery having at least one such battery module.

In the US 2009/0111009 A1 is a device for powering a vehicle, in particular a passenger car or a motorcycle, described with a plurality of electrochemical storage cells. At least one of the electrodes arranged in each case in the memory cells is made of metal or is largely provided over the entire surface with a metal layer. The metal electrode or the metal layer, in particular a metal foil, is electrically conductively connected via a connection element to a connection terminal provided outside the memory cell. The device is provided in particular for a temporary electromotive drive of a motor vehicle, to which it has a heat-conducting cooling plate, which is in thermal contact with substantially each of the terminals of the memory cells. The cooling plate discharges the heat energy supplied from the metal electrodes or metal layers of the electrodes to the terminal via the terminal.

The object of the invention is to specify a cell module that is improved over the prior art, a battery module that is improved over the prior art, and an improved electrical battery compared with the prior art.

With regard to the cell module, the object is achieved according to the invention with the features specified in claim 1. With regard to the battery module, the object is achieved according to the invention with the features specified in claim 7. With regard to the electric battery, the object is achieved according to the invention with the features specified in claim 9.

Advantageous embodiments of the invention are the subject of the dependent claims.

A cell module for an electric battery comprises a plurality of individual cells, at least two cell pole connectors, by means of which the individual cells are electrically connected in parallel or in series with one another, and at least one tempering element for tempering the individual cells. According to the invention, it is provided that the at least one tempering element is thermally conductively connected to a first cell pole connector, wherein each individual cell is electrically and thermally conductively connected to the first cell pole connector and wherein the at least one tempering element has two sections arranged at right angles to one another, wherein a first section has a contact surface forms for the first Zellpolverbinder and is arranged parallel to a flat side of the first Zellpolverbinders and perpendicular to a longitudinal orientation of the individual cells, and wherein a second portion is arranged parallel to the longitudinal direction of the individual cells.

The cell module thus formed allows a modular design of the electric battery, whereby a repair and replacement of individual components of the electric battery over the prior art are simplified and less expensive. Furthermore, the cell module enables an efficient and easy-to-install cooling of the individual cells, wherein each individual cell is thermally conductively connected to the temperature control element via the first cell pole connector and thus an indirect temperature control of the individual cells is possible. The tempering is, for example, a cooling plate with a number of cooling channels, which are traversed by a cooling medium.

In this case, a plurality of cell modules can be coupled to a single tempering element, wherein the individual cells are not firmly connected to the tempering, so that disassembly and reassembly of one or more cell modules can be carried out in a very simple manner. The arrangement of the tempering also allows space-saving dimensions of the cell module and thus also the electric battery. The electric battery is provided, for example, as a traction battery in a vehicle.

Embodiments of the invention are explained in more detail below with reference to drawings.

Showing:

1 FIG. 2 schematically a perspective view of a cell module with a cell pole connector in an embodiment according to the invention, FIG.

2 schematically a perspective view of the cell module according to 1 with another cell pole connector,

3 1 schematically a perspective view of a battery module with four cell modules and a tempering element,

4 schematically two interconnected battery modules with four cell modules in perspective view,

5 schematically two interconnected cell modules in a space with another tempering in a perspective view and

6 schematically a perspective view of a space with a plurality of battery modules.

Corresponding parts are provided in all figures with the same reference numerals.

1 and 2 each show schematically an embodiment of a cell module according to the invention 1 for an in 6 illustrated electric battery 2 in a perspective view.

In the present embodiment, the cell module comprises 1 43 single cells 1.1 , which are electrically connected in parallel with each other. Alternatively, the cell module comprises 1 one of the number shown deviating number of single cells 1.1 on.

The single cells 1.1 each include a cell housing 1.1.1 , in which an unrepresented inside of the cell, for example in the form of electrochemically active films, is arranged. The cell case 1.1.1 is designed circular cylindrical. A lateral surface of the cell housing 1.1.1 is z. B. of an electrically insulating material, such as plastic.

At the end faces of a single cell 1.1 in each case a cell pole (not shown) is arranged, wherein on one end face a positive pole and on the opposite end side a negative pole is arranged. In the present exemplary embodiment, all positive poles and negative poles of the individual cells are in each case 1.1 aligned in the same direction, so that the single cells 1.1 by means of cell pole connectors 1.2 . 1.3 electrically connected in parallel with each other.

In 1 is a first cell pole connector 1.2 shown which the minus poles of the single cells 1.1 connects electrically conductive with each other. The first cell pole connector 1.2 is made of an electrically and heat conductive material, for. As metal, formed, wherein the individual cells 1.1 firmly with the first Zellpolverbinder 1.2 are connected. For example, the cell case becomes 1.1.1 of the single cells 1.1 by laser welding, laser soldering or other suitable joining methods with a flat side of the first cell pole connector 1.2 firmly connected. This is a thermal conductivity of the individual cells 1.1 via the joints to the first cell pole connector 1.2 produced.

The first cell pole connector 1.2 further comprises one from the flat side in the direction of longitudinal alignment of the single cells 1.1 Angled connecting element 1.2.1 , which is preferably formed integrally with the flat side. The connecting element 1.2.1 protrudes from an edge, in particular from an end edge of the flat side of the first Zellpolverbinders 1.2 from. The connecting element 1.2.1 is for the electrical connection of the cell module 1 with another cell module 1 provided, as exemplified in 3 is shown.

In 2 is additionally a second Zellpolverbinder 1.3 shown which the positive poles of the single cells 1.1 connects electrically conductive with each other. The second cell pole connector 1.3 is in the present embodiment on a single cells 1.1 remote flat side of a plate or trough-shaped carrier body 1.3.1 arranged, which consists of an electrically insulating material, for. B. an injection molded plastic body is formed. The carrier body 1.3.1 has one with a number of single cells 1.1 corresponding number of recesses so that the positive poles of the single cells 1.1 electrically conductive with the second Zellpolverbinder 1.3 are connectable. The electrical connection of the positive poles with the second Zellpolverbinder 1.3 For example, by means of bonding wires, in particular by means of aluminum or Kupferbonddrähten. On the carrier body 1.3.1 are the single cells 1.1 , especially the cell case 1.1.1 cohesively fixed by means of a potting compound.

3 schematically shows a battery module 3 , which is four of the previously described cell modules 1 includes, in a perspective view.

The battery module shown 3 exemplifies a so-called base module for placement in the electric battery 2 with a nominal voltage of 14.6 volts.

The cell modules 1 are arranged side by side in pairs, with two cell modules each 1 form a cell module pair whose first cell connector poles 1.2 are arranged facing each other. The cell modules 1 are electrically connected together in series, so that the connecting element 1.2.1 of the first cell connector pole 1.2 one of the cell modules 1 with the second cell connector pole 1.2 of an adjacent cell module 1 is electrically connected. This is the connecting element 1.2.1 executed angled at the free end and is located on the second Zellverbinderpol 1.2 on.

For tempering the single cells 1.1 the cell modules 1 in the battery module 3 is a tempering element 4 provided, as shown by way of example in the present embodiment.

The tempering element 4 includes two sections 4.1 . 4.2 , which are each plate-shaped and arranged at right angles to each other. there is a first section 4.1 between the cell modules 1 the cell module pairs and thus in particular in each case between the first Zellverbinderpolen 1.1 the cell module pairs arranged. That is, the first section 4.1 is the first Zellverbinderpolen each with a flat side 4.1 two cell modules 1 arranged facing and perpendicular to a longitudinal alignment of the individual cells 1.1 ,

A second section 4.2 of the tempering 4 is perpendicular to the first section 4.1 arranged and thus runs parallel to the longitudinal orientation of the individual cells 1.1 , In the present embodiment, the second section runs 4.2 starting from the first section 4.1 respectively in the direction of the second Zellpolverbinder 1.3 the cell modules 1 ,

The tempering element 4 For example, is a cooling plate with a number of cooling channels through which a cooling medium, for. B. a cooling liquid flows. As every single cell 1.1 a cell module 1 electrically conductive and heat conductive with the first cell pole connector 1.2 are connected and the first cell pole connector 1.2 each with the tempering 4 thermally coupled, can waste heat of the individual cells 1.1 during operation of the cell module 1 effectively dissipated. Alternatively or additionally, the tempering 4 also for heating the individual cells 1.1 serve. Furthermore, to avoid a short circuit between the first section 4.1 and the first cell connector poles 1.2 as well as between the second section 4.2 and the single cells 1.1 in each case an electrically insulating heat-conducting foil 5 arranged. The heat-conducting foil 5 For example, consists of a soft and elastic plastic base material, eg. As soft silicone, which with good thermal conductivity particles, eg. B. alumina, is filled.

In the illustrated construction of the battery module 3 is it possible to use single cell modules 1 to dismantle, z. B. in case of repair. A disassembly effort is due to the design and arrangement of the temperature control element shown 4 Compared to the prior art considerably simplified.

4 shows an extension of the base module described above, wherein two battery modules 3 each with four cell modules 1 electrically connected to each other in series and thus, for example, have a nominal voltage of 29.2 volts. The battery modules 3 are shown schematically in perspective view.

The battery modules 3 form a so-called double module, the battery modules 3 in a longitudinal orientation of the tempering 4 are arranged side by side. The tempering element 4 is in this case according to a dimension of the double module compared to in 3 shown embodiment extended or extended in the longitudinal direction.

The temperature of the individual cells 1.1 can in this case directly over the tempering 4 take place, which - as already described - flows through a cooling liquid. Alternatively, the tempering 4 also serve as a heat buffer and with another, traversed by a cooling liquid tempering 6 be connected thermally conductive.

In addition shows 5 exemplarily two interconnected cell modules 1 in a space B with another tempering 6 in a schematic, perspective view.

The space B is arranged for example in a vehicle, not shown, and serves to receive the electric battery 2 , which one or more electrically interconnected battery modules 3 includes. In the present embodiment, for better illustration only two cell modules 1 shown in the installation space B.

The tempering element 4 serves as a heat buffer for storing the waste heat of the individual cells 1.1 , where in the tempering 4 stored heat via the further tempering 6 is dissipated. The hollow sections shown in the further tempering 6 serve as cooling channels, which are flowed through by a cooling medium. For example, the cooling medium is a cooling fluid that is provided by an air conditioning circuit of the vehicle.

Furthermore, the cell modules shown are 1 each with the first cell connector pole 1.2 a battery housing bottom (not shown) arranged facing, in which case the tempering 4 not at the first cell connector poles 1.2 is arranged adjacent. In this case, a temperature control can also be done via the battery case floor.

7 shows an arranged in a space B electric battery 2 with a plurality of electrically interconnected battery modules 3 , The electric battery 2 is in a battery case 2.1 (Only partially shown in the present embodiment) arranged. The battery modules 3 are variably electrically connected in parallel and / or in series with each other.

The modular construction of the electric battery 2 allows optimal use of space B, with individual cell modules 1 and / or battery modules 3 are interchangeable in a simple way. In addition, the use of other cell types, e.g. B. frame flat cells in the installation space B, possible. For example, the electric battery includes 2 both round cells and frame flat cells as single cells 1.1 ,

LIST OF REFERENCE NUMBERS

1

cell module

1.1

single cell

1.1.1

cell case

1.2

first cell pole connector

1.2.1

connecting element

1.3

second cell pole connector

1.3.1

support body

2

electric battery

2.1

battery case

3

battery module

4

tempering

4.1

first section

4.2

second part

5

Heat conducting

6

another tempering element

B

space

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2009/0111009 A1 [0002]

Claims (10)

Cell module ( 1 ) for an electric battery ( 2 ) with - a plurality of individual cells ( 1.1 ), - at least two cell pole connectors ( 1.2 . 1.3 ), by means of which the individual cells ( 1.1 ) are electrically connected in parallel or in series with each other, and - at least one tempering element ( 4 ) for tempering the individual cells ( 1.1 ), characterized in that the at least one tempering element ( 4 ) with a first cell pole connector ( 1.2 ) is thermally conductively connected, wherein - each individual cell ( 1.1 ) electrically and thermally conductively connected to the first cell pole connector ( 1.2 ) and - the at least one tempering element ( 4 ) two sections arranged at right angles to each other ( 4.1 . 4.2 ), wherein a first section ( 4.1 ) parallel to a flat side of the first cell pole connector ( 1.2 ) and perpendicular to a longitudinal orientation of the individual cells ( 1.1 ), and wherein a second section ( 4.2 ) parallel to the longitudinal orientation of the individual cells ( 1.1 ) is arranged. Cell module ( 1 ) according to claim 1, characterized in that between the first cell pole connector ( 1.2 ) and the at least one tempering element ( 4 ) an electrically insulating heat conducting foil ( 5 ) is arranged. Cell module ( 1 ) according to claim 1 or 2, characterized in that the individual cells ( 1.1 ) are electrically connected to each other in parallel, wherein the first Zellpolverbinder ( 1.2 ) the negative poles of the single cells ( 1.1 ) electrically interconnects. Cell module ( 1 ) according to claim 3, characterized in that a second Zellpolverbinder ( 1.3 ) is arranged, which the positive poles of the single cells ( 1.1 ) electrically interconnects. Cell module ( 1 ) according to claim 4, characterized in that the second cell pole connector ( 1.3 ) a carrier body ( 1.3.1 ) of an electrically insulating material, in which the individual cells ( 1.1 ) are firmly bonded. Cell module ( 1 ) according to one of the preceding claims, characterized in that the individual cells ( 1.1 ) each have a circular cylindrical cross-section. Battery module ( 3 ), comprising a plurality of cell modules connected electrically in series with each other ( 1 ) according to any one of the preceding claims, wherein - all cell modules ( 1 ) thermally with a common tempering ( 4 ) and - on opposite flat sides of the first section ( 4.1 ) of the tempering element ( 4 ) several cell modules ( 1 ) are arranged side by side, wherein two cell modules ( 1 ) form a cell module pair and each with their first Zellpolverbindern ( 1.2 ) with the associated flat side of the first section ( 4.1 ) are thermally coupled. Battery module ( 3 ) according to claim 7, characterized by four cell modules ( 1 ), which are electrically connected with each other in series. Electric battery ( 2 ) comprising at least one battery module ( 3 ) according to claim 7 or 8. Electric battery ( 2 ) according to claim 9, characterized by a further tempering element ( 6 ), which with the tempering ( 4 ) of the at least one battery module ( 3 ) is thermally coupled, wherein the further tempering ( 6 ) parallel to the longitudinal orientation of the individual cells ( 1.1 ) and perpendicular to the flat side of the first Zellpolverbinders ( 1.2 ) of the respective cell modules ( 1 ) is aligned.

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