DE102022001673A1 - Lid assembly for a battery cell and battery cell - Google Patents

Abstract

The invention relates to a cover assembly (1) for a battery cell (2), having a carrier plate (5) which has at least one cutout (8) for a pole terminal (3), and at least one pole terminal (3) which passes through the cutout ( 8) is passed through, with an adhesive (4) being arranged in a gap between the carrier plate (5) and the pole terminal (3), by means of which the carrier plate (5) and the pole terminal (3) are connected to one another. According to the invention, between the An elastic sealing element (11) is arranged on the support plate (5) and the pole terminal (3) and delimits the gap on the circumference, with an outer peripheral area of the sealing element (11) having a greater thickness than an inner peripheral area of the sealing element (11) adjoining it in the direction of the adhesive (4). 11). The invention also relates to a battery cell (2)

Description

The invention relates to a cover assembly for a battery cell according to the features of the preamble of claim 1 and a battery cell.

Are from the prior art, as in the DE 10 2018 212 451 A1 described, a cover assembly for a battery cell and a method for producing the same known. The cover assembly includes a cover panel and at least one terminal. The cover plate and the terminal are mechanically connected to one another and electrically insulated from one another by a plastic insulator arranged in a gap between the cover plate and the terminal and made of a thermoplastic material injected into the gap, with at least one contact surface between the plastic insulator and the cover plate or the terminal being at least partially isolated is pretreated.

The invention is based on the object of specifying a cover assembly for a battery cell that is improved compared to the prior art and a battery cell that is improved compared to the prior art.

The object is achieved according to the invention by a cover assembly for a battery cell having the features of claim 1 and a battery cell having the features of claim 3.

Advantageous configurations of the invention are the subject matter of the dependent claims.

A cover assembly for a battery cell comprises a support plate, in particular made of metal, which has at least one cutout for a pole terminal, and at least one pole terminal, in particular made of metal, which is guided through the cutout, with a gap between the support plate and an adhesive is arranged on the pole terminal, by means of which the carrier plate and the pole terminal are connected to one another.

According to the invention, an elastic sealing element is arranged between the carrier plate and the pole terminal and delimits the gap on the peripheral side, with an outer peripheral area of the sealing element having a greater thickness than an inner peripheral area of the sealing element adjoining it in the direction of the adhesive. The sealing element is in particular an O-ring with a sealing lip formed thereon on the inner peripheral side, the O-ring forming the outer peripheral area of the sealing element and the sealing lip forming the inner peripheral area of the sealing element.

A battery cell according to the invention comprises such a cover assembly and a housing, in particular made of metal, in which an electrochemically active content with at least one first electrical conductor and at least one second electrical conductor for each electrical potential is arranged and which is closed with the cover assembly. The electrochemically active content is in particular an electrode foil stack or electrode foil coil, comprising a plurality of anode foils and cathode foils arranged alternately, between which a separator foil is arranged in each case. Furthermore, in particular an electrolyte is arranged in the housing. Electrochemically active content and electrolyte are also referred to as cell chemistry. The cover assembly can also be used with cell chemistries without an electrolyte, such as so-called 'solid-state cells'.

For example, the first electrical arrester is electrically conductively connected to the pole terminal and the second electrical arrester is electrically conductively connected to the housing, for example to a base of the housing opposite the cover assembly. The first electrical conductor is, for example, an electrically negative conductor and the second electrical conductor is an electrically positive conductor of the electrochemically active content. The support plate is advantageously connected to the housing in an electrically conductive manner. The pole terminal thus forms an electrical cell pole and the housing and thus advantageously also the carrier plate forms the other electrical cell pole of the battery cell.

The battery cell is provided in particular for a drive battery for supplying electrical energy to at least one electric drive motor for driving a vehicle, in particular an electric vehicle or hybrid vehicle.

The solution according to the invention, in particular the cover assembly according to the invention, requires fewer components, fewer interfaces and less effort during assembly than solutions known from the prior art. The solution according to the invention is also a particularly cost-effective solution. In addition, the solution according to the invention achieves a particularly compact design of the cover assembly, which allows an increase in installation space for the cell chemistry in the battery cell and thus a longer range of the vehicle with the drive battery of the same size.

The solution according to the invention also achieves an improvement in the electrical and thermal properties of the battery cell. A cooling of cell poles of the battery cell is from outside in a simple manner, since the pole terminal forming a cell pole and the carrier plate can be arranged flush with one another.

The solution according to the invention enables different variants of the battery cell, for example a polar battery cell and/or a mutual arrangement of the cell poles.

The adhesive is, for example, a hardened plastic, i. H. it is filled into the gap in the liquid state during manufacture of the cover assembly and then hardens. This hardened plastic enables high forces to be transferred, so that the battery cell is not damaged even when high forces are applied.

In particular, the adhesive also provides electrical insulation of the pole terminal relative to the carrier plate and thus relative to the housing. This makes it possible to use the housing for power transmission, i. H. as one of the two electrical cell poles, for example as an electrically positive cell pole, of the battery cell, which means that a collector can be omitted. In this case, the at least one first electrical conductor, for example the electrically negative conductor, is electrically conductively connected to the at least one pole terminal and the second electrical conductor, for example the electrically positive conductor, is connected to the housing, for example to the base opposite the cover assembly of the housing, electrically conductively connected.

The sealing and power transmission functions are separated by the additional sealing element. The elastic sealing element is used to seal an interior of the housing from the outside of the battery cell and the adhesive is used in particular or exclusively to connect the pole terminal to the carrier plate and a possible power transmission from the pole terminal to the carrier plate or vice versa. This separation of the sealing and power transmission functions makes the solution according to the invention particularly robust.

The advantageously provided sealing lip on the sealing element ensures that the adhesive does not affect the properties of the sealing element during curing, so that the sealing function of the sealing element is ensured even after the adhesive has cured.

Solutions are also conceivable in which the adhesive also assumes the sealing function, thereby eliminating the need for the O-ring as a sealing ring. In this case, it is advantageous to use an electrolyte or acid-resistant adhesive. In this case, the adhesive can also replace all other subsequent components that assume an insulating function.

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

• 1 schematisch eine perspektivische Darstellung einer Ausführungsform einer Deckelbaugruppe für eine Batteriezelle,
• 2 schematisch eine Schnittdarstellung der Ausführungsform der Deckelbaugruppe gemäß 1,
• 3 schematisch eine Detailvergrößerung des Details III in 2,
• 4 schematisch eine Detailvergrößerung des Details IV in 3,
• 5 schematisch eine perspektivische Schnittdarstellung eines Ausschnitts einer Ausführungsform einer Batteriezelle,
• 6 schematisch eine Teilexplosionsdarstellung von 5,
• 7 schematisch eine weitere Teilexplosionsdarstellung von 5,
• 8 schematisch eine Schnittdarstellung eines Dichtelements der Batteriezelle,
• 9 schematisch eine Ausführungsform miteinander elektrisch verschalteter Batteriezellen in einer Draufsicht von oben,
• 10 schematisch eine Seitenansicht einer Batteriezelle der Ausführungsform gemäß 9,
• 11 schematisch eine weitere Ausführungsform miteinander elektrisch verschalteter Batteriezellen in einer Draufsicht von oben,
• 12 schematisch eine Seitenansicht einer Batteriezelle der Ausführungsform gemäß 11,
• 13 schematisch eine weitere Ausführungsform miteinander elektrisch verschalteter Batteriezellen in einer Draufsicht von oben,
• 14 schematisch eine Seitenansicht einer Batteriezelle der Ausführungsform gemäß 13,
• 15 schematisch eine weitere Ausführungsform miteinander elektrisch verschalteter Batteriezellen in einer Draufsicht von oben,
• 16 schematisch die Ausführungsform gemäß 15 in einer Draufsicht von unten, und
• 17 schematisch eine Seitenansicht einer Batteriezelle der Ausführungsform gemäß 15.

show:

• 1 schematically a perspective view of an embodiment of a cover assembly for a battery cell,
• 2 schematically shows a sectional view of the embodiment of the cover assembly according to FIG 1 ,
• 3 schematically a detail enlargement of detail III in 2 ,
• 4 schematically an enlargement of detail IV in 3 ,
• 5 schematically a perspective sectional view of a section of an embodiment of a battery cell,
• 6 Schematically a partial exploded view of 5 ,
• 7 schematically another partial exploded view of 5 ,
• 8th a schematic sectional view of a sealing element of the battery cell,
• 9 schematically an embodiment of electrically interconnected battery cells in a plan view from above,
• 10 schematically shows a side view of a battery cell according to the embodiment 9 ,
• 11 schematically another embodiment of electrically interconnected battery cells in a plan view from above,
• 12 schematically shows a side view of a battery cell according to the embodiment 11 ,
• 13 schematically another embodiment of electrically interconnected battery cells in a plan view from above,
• 14 schematically shows a side view of a battery cell according to the embodiment 13 ,
• 15 schematically another embodiment of electrically interconnected battery cells in a plan view from above,
• 16 schematically according to the embodiment 15 in a plan view from below, and
• 17 schematically shows a side view of a battery cell according to the embodiment 15 .

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

Based on 1 until 17 In the following, embodiments of a cover assembly 1 for a battery cell 2 and embodiments of a battery cell 2 with such a cover assembly 1 are described. The battery cell 2 is provided in particular for a drive battery for supplying electrical energy to at least one electric drive motor for driving a vehicle, in particular an electric vehicle or hybrid vehicle.

Cover assemblies 1 of battery cells 2 fulfill various functions, for example electrical insulation of pole terminals 3, sealing against the ingress of moisture and leakage of electrolyte, conducting electrical currents, tapping electrical voltages and/or absorbing forces. Correspondingly, such cover assemblies 1 have hitherto been of complex construction and design.

In the prior art, the individual functions are performed by different components. However, the large number of components requires complex matching of the individual components to one another. In addition, assembly of the cover assembly 1 is particularly complicated due to the large number of components. The cover assemblies 1 from the prior art require a large amount of space, resulting in a low degree of filling of the battery cell 2 . The cover assemblies 1 known from the prior art are also error-prone solutions, for example with regard to leaks, electrolyte resistance and other criteria. In addition, the cover assemblies 1 known from the prior art have a number of connection points in the current path, for example ultrasonic weld connections, laser weld seams, roll-clad elements, press connections and/or other connections that lead to high contact resistance and heat generation. They are particularly disadvantageous for the thermal behavior of the battery cell 2 when charging and discharging.

Solutions for glued cover assemblies 1 have also shown that fulfilling a simultaneous force function and sealing function through an adhesive 4 used can be problematic. Furthermore, these solutions are not consistently thought through and also contain several electrical interfaces with corresponding contact resistances, which have a negative effect on the electrical properties.

Furthermore, in the case of the cover assemblies 1 known from the prior art, small connection areas and a small cross section of collectors lead to an inhomogeneous current density distribution with large cell dimensions. In the case of the cover assemblies 1 from the prior art, two pole terminals 3 are also always provided, which are each completely electrically insulated from a carrier plate 5 and a housing 6 of the battery cell 2 .

Furthermore, the cover assemblies 1 from the prior art only have small bursting discs 7, with corresponding disadvantages in the event of a thermal event which requires excess pressure to escape from the battery cell 2.

So far, it has been a problem to provide a cover assembly 1 that does not have these disadvantages known from the prior art, but instead integrates all of the above functions or at least several, in particular a vast majority, of the above functions in a compact installation space and thereby a high degree of filling for a cell chemistry in the battery cell 2 provides. This problem is solved by the solution described below. This solution enables a compact installation space for the cover assembly 1. It also enables, in particular through different embodiments of the cover assembly 1, different embodiments of a respective optimized cell design with improved electrical and thermal properties and the improved transmission of high currents and thus a quick charging capability of the battery cell 2. Some of the possible embodiments are described below by way of example.

the 1 until 4 show an embodiment of the cover assembly 1. The 5 until 7 show a section of a battery cell 2 with a further embodiment of the cover assembly 1.

In all of the embodiments, the cover assembly 1 comprises the carrier plate 5, which has at least one cutout 8 for a pole terminal 3, and at least one pole terminal 3, which is guided through the cutout 8. For this purpose, the pole terminal 3 has an upper, narrow section, the cross section of which is smaller than the clear width of the cutout 8, so that it can be arranged in the cutout 8 or passed through it. Furthermore, the pole terminal 3 has a lower wide section whose cross section is larger than the clear width of the recess 8, so that a The pole terminal 3 is prevented from falling out of the recess 8 .

An insulating element 9 is provided for the electrical insulation of the pole terminal 3 from the carrier plate 5 and is arranged between the lower section of the pole terminal 3 and the carrier plate 5 so that the pole terminal 3 does not bear against the carrier plate 5 .

Furthermore, a gap is formed between the pole terminal 3 , in particular its upper narrow section, and the carrier plate 5 . The adhesive 4, in particular a casting compound, is arranged in this gap. This adhesive 4 is, for example, a duroplast, which can also have glass fibers, for example, so that a glass fiber reinforced plastic (GRP) is formed in the cured state. The adhesive 4 is filled into the gap, in particular in the liquid state, for example poured or injected, fills it and hardens therein. The pole terminal 3 is connected to the carrier plate 5 by means of this adhesive 4 and is also electrically insulated from the carrier plate 5 . The adhesive 4 thus achieves an electrically insulating and stable direct connection of the carrier plate 5 with the pole terminal 3 .

To optimize this connection, the gap into which the adhesive 4 is filled can have, for example, one or more grooves 10, bevels and/or recesses. As a result, a contact surface for the adhesive 4 on the carrier plate 5 and/or on the pole terminal 3 is enlarged. In addition, one or more undercuts can thereby be formed, in particular by grooves 10 and/or recesses. The adhesive 4 then penetrates into these undercuts, as a result of which, after the adhesive 4 has hardened, not only an integral connection but also a positive connection is formed. The embodiment according to 5 until 7 shows an example of such a groove 10 in an outer circumference of the upper narrow section of the pole terminal 3. Depending on the viscosity of the adhesive, ventilation channels can also be provided in the carrier plate, which enable the gap to be filled with the adhesive more quickly.

Provision is also made for an elastic sealing element 11 which delimits the gap on the peripheral side to be arranged between the carrier plate 5 and the pole terminal 3 . An outer peripheral area of the sealing element 11 has a greater thickness than an inner peripheral area of the sealing element 11 adjoining it in the direction of the adhesive 4, as shown in FIG 8th shown in a cross-sectional representation of the sealing element 11 . The sealing element 11 is in particular an O-ring 11.1 with a sealing lip 11.2 formed thereon on the inner peripheral side, the O-ring 11.1 forming the outer peripheral area of the sealing element 11 and the sealing lip 11.2 forming the inner peripheral area of the sealing element 11.

The sealing lip 11.2, through which a shoulder to the outer peripheral area with greater thickness is formed, allows freedom of movement of the sealing element 11, in particular of the outer peripheral area advantageously formed as an O-ring 11.1, because the sealing lip 11.2 prevents the hardened adhesive 4 from restricting this freedom of movement. The sealing element 11 seals an interior space of the battery cell 2 from an external environment, so that no moisture can enter and no electrolyte can escape. In this case, this sealing function is taken over in particular by the outer peripheral region of the sealing element 11 which is designed, for example, as an O-ring 11.1 with a greater thickness, while the sealing lip 11.2, i. H. the inner peripheral region of the sealing element 11 adjoining it in the direction of the adhesive 4 with a smaller thickness forms a barrier for the adhesive 4 during its curing.

The sealing lip 11.2 thus prevents the still liquid adhesive 4 from penetrating as far as the outer peripheral area of the sealing element 11, which is designed in particular as an O-ring 11.1, and sticking, damaging and/or hardening it with it, as a result of which it would no longer be elastic and movable and thus its Sealing function could no longer fulfill. Since this is prevented by the sealing lip 11.2, a movement of the elastic sealing element 11, in particular of the outer peripheral region advantageously designed as an O-ring 11.1, outwards, i. H. away from the adhesive 4 and pole terminal 3 and in the direction of the insulating element 9. For this purpose, a free space 12 is provided between the sealing element 11 and the insulating element 9, into which the sealing element 11 can move.

To ensure the sealing function, the sealing element 11, in particular the outer peripheral area advantageously designed as an O-ring 11.1, is advantageously pressed in a predetermined manner between the carrier plate 5 and the pole terminal 3 during assembly of the cover assembly 1 until the adhesive 4 is filled in and hardened. The fact that this compression takes place in a predetermined manner is also ensured by the insulation element 9 between the pole terminal 3 and the carrier plate 5, which forms a spacer for this compression and thus prevents the sealing element 11 from being compressed too much.

In the solution described, the sealing element 11 thus assumes the sealing of the battery cell 2. The adhesive 4 is used in particular for power transmission and the insulating connection of the metal pole terminal 3 with the metal carrier plate 5. The adhesive 4 can also take on a sealing function, due to of the sealing element 11, however, this is not absolutely necessary. If the adhesive also assumes the sealing function, the O-ring 11 can be omitted.

In addition, the adhesive can also replace the insulation element 9, so that a particularly simple solution is achieved with an adhesive or casting compound with high functional integration.

the 9 and 10 , 11 and 12 , 13 and 14 and 15 to 17 show different embodiments of battery cells 2 with different embodiments of the cover assembly 1 by way of example 9 , 11 , 13 and 15 each a plan view from above of two electrically interconnected battery cells 2 and the 10 , 12 , 14 and 17 each show one of the battery cells 2 of the respective embodiment in a side view, with a side wall of the housing 6 of the battery cell 2 not being shown, so that the inside of the cell is visible. the 16 additionally shows a plan view from below of the two battery cells 2 electrically connected to one another according to the embodiment 15 .

The respective embodiment of the battery cell 2 includes the respective embodiment of the cover assembly 1 and the housing 6 which is closed with the cover assembly 1 . An electrochemically active content 13 with at least one first electrical conductor A1 and at least one second electrical conductor A2 for one electrical potential each is arranged in the housing 6 . The first electrical conductor A1 is, for example, an electrically negative conductor and the second electrical conductor A2 is an electrically positive conductor of the electrochemically active content 13.

The electrochemically active content 13 is in particular an electrode foil stack or electrode foil coil, comprising a plurality of anode foils and cathode foils arranged alternately, between which a separator foil is arranged in each case. Furthermore, in particular an electrolyte, in particular a liquid electrolyte, is arranged in the housing 6, which is not shown in the figures. Electrochemically active content 13 and electrolyte are also referred to as cell chemistry.

In the embodiment according to FIG 9 and 10 the first electrical arrester A1 is electrically conductively connected to the pole terminal 3 and the second electrical arrester A2 is electrically conductively connected directly to the carrier plate 5 of the cover assembly 1 . Thus, the pole terminal 3 and the carrier plate 5 each form an electrical cell pole P1, P2 of the battery cell 2. A cell connector 14 for electrically connecting the two battery cells 2 is thus electrically conductive with the pole terminal 3 of one battery cell 2 and the carrier plate 5 of the other battery cell 2 tied together.

The cover assembly 1 used for this embodiment of the battery cell 2 corresponds, for example, to that in FIGS 1 until 4 illustrated embodiment, because only one pole terminal 3 is provided here. A connection section 15 for the second electrical arrester A2 is in the embodiment according to FIG 1 until 4 however slightly raised on the outside, ie slightly projecting over a remaining outer surface of the support plate 5, while in the embodiment according to FIGS 9 and 10 the support plate 5 is flat.

In this embodiment of the battery cell 2, the carrier plate 5 of the cover assembly 1 also has a pressure release opening 16 closed by a bursting disk 7, which is arranged here between the two cell poles P1, P2. The pressure relief opening 16 is used for a controlled release of excess pressure in the event of a thermal event, in particular a so-called thermal runaway, of the battery cell 2 exceeds the specified upper limit. This closed with the bursting disc 7 pressure relief opening 16 is also in the embodiment of the cover assembly 1 according to FIG 1 until 4 provided in the support plate 5.

In the embodiment according to FIG 11 and 12 the cover assembly 1 has two pole terminals 3 which are each arranged in an end face area of the carrier plate 5 . In this case, a longitudinal extent of the respective pole terminal 3 runs parallel to a longitudinal extent of the carrier plate 5. The respective pole terminal 3 is not arranged centrally in the width direction of the carrier plate 5, but offset in the direction of a longitudinal side of the carrier plate 5, with the two pole terminals 3 offset in the direction of the same longitudinal side are arranged.

In the example shown, two first electrical conductors A1 are provided, each of which is electrically conductively connected to one of the pole terminals 3 . Furthermore, a second electrical arrester A2 is provided, which directly with is electrically conductively connected to the housing 6, more precisely to a bottom 17 of the housing 6 opposite the cover assembly 1. Thus, the two pole terminals 3 each form an electrical cell pole P1 with the same electrical polarity, for example a negative cell pole, and the housing 6 and thus also the carrier plate 5 of the cover assembly 1, which is electrically conductively connected to the housing 6, forms the cell pole P2 with the other electrical Polarity, for example a positive cell pole.

Two cell connectors 14 are provided here for the electrical interconnection of the two battery cells 2 , which are each electrically conductively connected to one of the pole terminals 3 of one battery cell 2 and the carrier plate 5 of the other battery cell 2 . To connect the respective cell connector 14 to the carrier plate 5, a region of the carrier plate 5 between the respective pole terminal 3 and the longitudinal side of the carrier plate 5 remote from the pole terminal 3 is used. The two pole terminals 3 and the two cell connectors 14 increase a total contact surface, for example, and thus reduce a contact resistance.

In this embodiment, the pressure release opening 16 closed by the bursting disk 7 is arranged in a middle area in the longitudinal direction of the carrier plate 5 between the two pole terminals 3 .

In the embodiment according to FIG 13 and 14 the cover assembly 1 has a pole terminal 3 which extends over a substantial part of the longitudinal extension of the carrier plate 5, ie from one end face area to the other end face area. The pole terminal 3 is not arranged centrally in the width direction of the carrier plate 5 but offset in the direction of a longitudinal side of the carrier plate 5 .

In the width direction of the carrier plate 5 next to the pole terminal 3 is the pressure release opening 16, which is closed by the bursting disk 7 and is shorter than the pole terminal 3. It is provided that an end face area of the pressure release opening 16 facing one end face of the carrier plate 5 and one of this end face the end face area of the pole terminal 3 facing the carrier plate 5 has, at least essentially, the same distance from this end face of the carrier plate 5 . Due to the shorter length of the pressure release opening 16, there is a free area on the support plate 5 between the other end face area of the pressure release opening 16 and the other end face of the support plate 5 next to the pole terminal 3, which is used for the connection with a cell connector 14.

The first electrical arrester A1 is electrically conductively connected to the pole terminal 3 and the second electrical arrester A2 is electrically conductively connected directly to the housing 6, more precisely to the base 17 of the housing 6 opposite the cover assembly 1. The pole terminal 3 thus forms an electrical cell pole P1 of the battery cell 2 and the housing 6 and thus also the carrier plate 5 of the cover assembly 1, which is electrically conductively connected to the housing 6, forms the other cell pole P2 of the battery cell 2. The cell connector 14 for the electrical connection of the two battery cells 2 is electrically conductively connected to the pole terminal 3 of one battery cell 2 and in the above-mentioned free area to the support plate 5 of the other battery cell 2.

The long pole terminal 3 enables a correspondingly large connection area between the first electrical arrester A1 and the pole terminal 3, as a result of which the contact resistance is reduced. Due to the long pressure relief opening 16, which extends over a significant part of the longitudinal extent of the support plate 5, a particularly rapid overpressure compensation is made possible in the event of a thermal event after the bursting disc 7 has ruptured.

In the embodiment according to FIG 15 until 17 the cover assembly 1 has a pole terminal 3, which extends over a substantial part of the longitudinal extent of the carrier plate 5, ie from one end face area to the other end face area, as in FIG 15 shown. The pole terminal 3 is here also arranged centrally in the width direction of the carrier plate 5 and also extends over a substantial part of the width of the carrier plate 5 between its two longitudinal sides. This enables a particularly long and wide pole terminal 3 and thus a large connecting surface for the cell connector 14 and also a large connecting area of the first electrical arrester A1 with the pole terminal 3, which reduces the contact resistance.

The pressure release opening 16 closed by the bursting disk 7 is not arranged in the support plate 5 here, but in the bottom 17 of the housing 6, as in FIG 16 shown. It extends over a substantial part of the longitudinal extent of the base 17, ie from one end face area to the other end face area. This long pressure release opening 16 enables a particularly rapid overpressure equalization in the event of a thermal event after the bursting disk 7 has ruptured.

The first electrical arrester A1 is electrically conductively connected to the pole terminal 3 and the second electrical arrester A2 is directly connected to the Housing 6, more precisely with the cover assembly 1 opposite bottom 17 of the housing 6, electrically conductively connected. The pole terminal 3 thus forms an electrical cell pole P1 of the battery cell 2 and the housing 6 and thus also the carrier plate 5 of the cover assembly 1, which is electrically conductively connected to the housing 6, forms the other cell pole P2 of the battery cell 2. The cell connector 14 for the electrical connection of the two battery cells 2 is electrically conductively connected to the pole terminal 3 of one battery cell 2 and to an area of the carrier plate 5 of the other battery cell 2 which is located next to the pole terminal 3 of the other battery cell 2 in the width direction.

In all of the illustrated embodiments, a direct connection of the respective electrical arrester A1, A2 to the pole terminal 3, the housing 6 or the support plate 5 is provided, whereby disadvantageous additional connection points and interfaces that would increase the contact resistance in the current path are avoided and also a complexity of the Battery cell 2 is reduced. Furthermore, this reduces the amount of space required, so that additional space is available for the cell chemistry, as a result of which a higher capacity of the battery cell 2 is made possible.

The solution described, in particular some of the embodiments described above, has/have a particularly large pole terminal 3, as already mentioned above. This enables a large connection cross-section for high power transmission and low heat development.

The solution described, in particular some of the embodiments described above, has/have a particularly large pressure relief opening 16 with a rupture disk 7, which enables particularly favorable behavior in the event of a thermal event, in particular a particularly rapid overpressure equalization after the rupture disk 7 bursts.

Reference List

1

lid assembly

2

battery cell

3

pole terminal

4

adhesive

5

backing plate

6

Housing

7

rupture disc

8th

recess

9

isolation element

10

groove

11

sealing element

11.1

o ring

11.2

sealing lip

12

free space

13

electrochemically active content

14

cell connector

15

connection section

16

pressure relief port

17

floor

A1, A2

electrical arrester

P1, P2

cell pole

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 102018212451 A1 [0002]

Claims (6)

Cover assembly (1) for a battery cell (2), having a carrier plate (5) which has at least one cutout (8) for a pole terminal (3), and at least one pole terminal (3) that is guided through the cutout (8). , wherein an adhesive (4) is arranged in a gap between the carrier plate (5) and the pole terminal (3), by means of which the carrier plate (5) and the pole terminal (3) are connected to one another, characterized in that between the carrier plate ( 5) and the pole terminal (3) there is an elastic sealing element (11) which delimits the gap on the peripheral side, with an outer peripheral area of the sealing element (11) having a greater thickness than an inner peripheral area of the sealing element (11) adjoining it in the direction of the adhesive (4). ). cover assembly (1). claim 1 , characterized in that the sealing element (11) is an O-ring (11.1) with a sealing lip (11.2) formed thereon on the inner peripheral side, the O-ring (11.1) forming the outer peripheral region of the sealing element (11) and the sealing lip (11.2) forms the inner peripheral area of the sealing element (11). Battery cell (2) with a cover assembly (1). claim 1 or 2 and a housing (6) in which an electrochemically active content (13) with at least one first electrical conductor (A1) and at least one second electrical conductor (A2) for each electrical potential is arranged and which is closed with the cover assembly (1). is. Battery cell (2) after claim 3 , characterized in that the first electrical arrester (A1) is electrically conductively connected to the pole terminal (3) and the second electrical arrester (A2) is electrically conductively connected to the housing (6). Battery cell (2) after claim 4 , characterized in that the second electrical arrester (A2) is electrically conductively connected to a base (17) of the housing (6) opposite the cover assembly (1). Battery cell (2) according to one of claims 3 until 5 , characterized in that the first electrical conductor (A1) is an electrically negative conductor and the second electrical conductor (A2) is an electrically positive conductor of the electrochemically active content (13).

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