Battery cell, vehicle, and method for manufacturing a battery cell

Abstract

The present disclosure relates to a battery cell (10) comprising a housing (20) having a wall (22) and at least one battery terminal (30, 40), the battery cell (10) comprising an electrode material (50) having an electrode tab (51), at least a portion of the electrode material (50) extending along the wall (22) within the housing (20), the electrode tab (51) being electrically connected to the at least one battery terminal (30, 40), and the battery cell (10) further comprising a deflection structure (80), the deflection structure is configured to deflect at least some of the electrode tabs (51) away from the wall (22). The present disclosure also relates to a vehicle comprising a battery element having at least one such battery cell (10). The present disclosure also relates to a method (100) for manufacturing a battery cell (10).

Description

Technical Field

[0001] The present disclosure relates to a battery cell, a vehicle, and a method of manufacturing a battery cell. Background Art

[0002] Battery electric vehicles (BEVs) run on electricity stored in battery cells, which are configured in various configurations of the vehicle, such as modules, cell to pack, or cell to body. Once the power is depleted, the battery cells must be recharged. Many car owners and drivers want to get to their destination as quickly as possible and value short charging stops to get back on the road and reach their destination quickly.

[0003] Refueling a gasoline car is simple and involves inserting the fuel handle and nozzle into the vehicle's fuel pipe. The subsequent pumping action will move the gasoline and fill a regular-sized car tank in a minute or two. Aside from running the electric pump to move the gasoline, little energy is lost in the process of moving the liquid. All in all, transferring gasoline through pipes can itself be considered a lossless process.

[0004] The process of charging a battery electric vehicle involves the transfer of electrons (i.e., electric current) compared to the transfer of chemical energy stored in the form of a flammable liquid and is therefore fundamentally different. When large currents are transmitted through wires, transmission losses increase significantly because the losses are related to and proportional to the resistance in the wires. This phenomenon is unique to BEVs and has no equivalent in traditional internal combustion engine vehicles. Therefore, recharging a BEV requires careful design considerations and system selections that mitigate multiple parameters related to, for example, resistive heat losses, cooling power, battery electrolyte temperature, and possible degradation, while aiming to provide a fast charging experience that can match that of an internal combustion engine vehicle.

[0005] In addition to all the technical design and system challenges associated with BEV recharging, the production of battery cells is a very complex manufacturing process. Specifically, for most applications, such as vehicles, battery cells should be manufactured with a high energy density per unit weight. Therefore, the manufacturing process is complex and involves many different manufacturing steps. For example, fully automated manufacturing requires a large investment to purchase and fine-tune production equipment to achieve the desired quality, output, and cost targets. Small process improvements, such as reducing time or integrating two or more process steps into one, can quickly achieve large-scale savings, increased profitability and output. Summary of the invention

[0006] The above-mentioned problems are at least partially solved or alleviated by the subject matter of the independent claims of the present disclosure, wherein more examples are included in the dependent claims.

[0007] According to a first aspect of the present disclosure, a battery cell is provided, comprising a housing having a wall and at least one battery terminal. The battery cell comprises an electrode material having an electrode sheet, at least a portion of which extends along the wall inside the housing. The electrode sheet is electrically connected to at least one battery terminal. The battery cell further comprises a deflection structure configured to deflect at least some of the electrode sheets away from the wall.

[0008] By deflecting at least part of the electrode sheet away from the wall by the deflection structure, no advantageous deflection of the electrode sheet is required before the electrode material with the electrode sheet is inserted into the housing when assembling the battery cell. The deflection structure can therefore be understood as a built-in feature of each battery cell, which provides an advantageous sheet deflection when assembling the battery cell. This saves an additional time-consuming manufacturing step and any machines or tools required for this purpose in the corresponding manufacturing step. This in turn saves costs in manufacturing the battery cell. Considering how many battery cells are used in different applications, especially in vehicles, these cost savings become very significant cumulatively.

[0009] The deflection structure is configured to deflect the electrode sheet away from the wall, which may mean that the deflection structure is arranged and / or designed to deflect at least some of the electrode sheets of the electrode material away from the wall. In particular, the electrode sheet can deviate from a portion of the electrode material, in particular a first portion extending along the wall and / or parallel to the wall in its extension direction. For example, the deflection of the electrode sheet by the deflection structure can be a one-time effect and / or a permanent effect. When the electrode material with the electrode sheet is inserted into the housing, a one-time effect can be achieved during the manufacture or assembly of the battery cell. In this case, the electrode sheet can be deflected, in particular bent relative to the first portion of the electrode material. The electrode sheet can then remain bent. A permanent effect may be when the deflection structure applies a force to at least some of the electrode sheets even after manufacture and thus remains bent upward.

[0010] The deflection structure configured to deflect at least some of the electrode pads away from the wall may alternatively be stated as the deflection structure by which at least some of the electrode pads are deflected away from the wall. The at least some of the electrode pads deflected away from the wall may comprise most or all of the electrode pads.

[0011] In particular, the electrode sheets can be deflected so that at least some, most or substantially all of the electrode sheets are in contact with each other, particularly in electrical contact through physical contact. This facilitates electrical contact between the individual electrode sheets to improve electrical conductivity from the electrode sheets to the battery terminals.

[0012] The deflection structure and / or the electrode material may be configured to bend at least part of the electrode sheet. This means that the electrode material is bent, in particular along a line that runs perpendicular to the direction in which the electrode material runs along the wall. This bending line may run between the sheet portion and another part of the electrode material. The other part may be referred to as the first part in this article, and the sheet portion may be referred to as the second part in this article to distinguish between the two parts. The bending of the electrode material may have a bending angle, which may be provided by the deflection structure, in particular its configuration, such as size, orientation, etc.

[0013] In particular, the battery cell may include two battery terminals, specifically a first battery terminal and a second battery terminal. The first battery terminal may be connected to the electrode sheet. The battery cell may further include at least one, in particular, two electrode materials, specifically a first electrode material and a second electrode material. The electrode material with the electrode sheet may be referred to as the first electrode material in this article. The battery cell may also include a separator material that may be disposed between the two electrode materials. The electrode material and the separator material may be part of an electrode assembly within the housing, which may be, for example, a jelly roll type.

[0014] The electrode sheet may be part of one of the plurality of electrode materials. In particular, the electrode sheet may be arranged at the end of the electrode material or form the end of the electrode material. The electrode material may have a first part and a second part, for example, as described above. The first part may be a part different from the second part, which may have an electrode sheet. The first part and / or the second part may extend at least partially along the wall of the housing. For example, the extension direction of the first part, in particular the longitudinal extension direction, may be parallel to the wall. The deflection may cause the extension directions of the first part of the electrode material and the second part of the electrode material, in particular the longitudinal extension direction, to be different from each other. In particular, the second part may extend away from the wall along it (longitudinal extension). In particular, there may be a bend between the two parts provided by the deflection of the deflection structure, for example along the above-mentioned bending line. Similarly, or in other words, there may be an angle between the extension directions of the two parts.

[0015] In one example, the housing may include at least part of the deflection structure. In particular, the housing may include most or all of the deflection structure. In addition, the housing and the deflection structure may be designed as a single piece or integral with each other. The incorporation of the deflection structure into the housing simplifies the provision of a deflection process during the manufacturing process of the battery cell.

[0016] In one example, the deflection structure may be formed at least partially by a wall portion of a wall. The wall portion may be an inner wall portion or an inner and outer wall portion. For an inner wall portion, the wall portion forming at least part of the deflection structure may be arranged only on the interior of the housing or inside the housing. For a variant of an inner and outer wall portion, the deflection structure is arranged on the interior and the exterior of the housing. Forming the deflection structure at least partially (which may mean that it is formed mostly or entirely by a wall portion of the wall) allows a simple and cost-effective design of the housing incorporating the deflection structure.

[0017] In one example, the wall portion may be a chamfered portion of the wall. The chamfered portion may be visible from the outside of the housing. Chamfering the wall allows a particularly simple and cost-effective design of the housing incorporating the deflection structure. Because the size of the chamfered portion may be limited by the longitudinal extension and / or position of the electrode sheet, the chamfer does not negatively limit the internal volume of the battery cell and thus the battery capacity of the battery cell which is typically related to the size of the electrode assembly.

[0018] In one example, the wall portion at least partially forming the deflection structure may be arranged at one of two opposite end portions of the housing. The opposite end portion may be located at a longitudinal end of the housing. By arranging the wall portion at least partially forming the deflection structure, the inner volume of the battery cell is not negatively affected by the deflection structure. Furthermore, it can be ensured that the electrode material is deflected, in particular bent, only when required, for example at its ends, in particular corresponding to the above-mentioned electrode sheet portions.

[0019] In one example, at least some of the electrode sheets may overlap each other. In particular, the electrode sheets, in particular the majority of the electrode sheets, may overlap other electrode sheets. In particular, a flower-like pattern of the electrode sheets may be provided by the deflection structure, in particular when the housing is cylindrical. When viewed from below, i.e. from the end of the housing, a flower-like pattern may appear. By overlapping the individual electrode sheets, the electrode sheets are electrically connected to each other by direct contact. Thereby, the conductivity for charging via the corresponding battery terminal is significantly increased.

[0020] In one example, the housing may be cylindrical. In addition, the housing may have an electrode assembly that includes an electrode sheet and is roll-type. This design of the housing and the electrode assembly is a non-limiting advantageous example. Alternatively, for example, the housing may be rectangular in shape.

[0021] In one example, at least part of the housing can be configured as at least one battery terminal. Specifically, at least one end portion or plate of the housing can be configured as at least one battery terminal. In addition, most or all of the housing can be configured as at least one battery terminal. The end portion or plate can be in electrical contact with an electrode sheet of an electrode material. For example, the entire housing can be used as a battery terminal, particularly a negative battery terminal.

[0022] In one example, the housing may include a bridging material that structurally connects the electrode sheet to at least one battery terminal. Thus, the bridging material may provide structural support for at least the electrode sheet to deflect, in particular bend, relative to the battery terminal.

[0023] In one example, the bridging material may be thermally and / or electrically conductive. This may allow heat to be thermally conducted from the electrode sheet to the battery terminals, particularly the housing, via the bridging material. In addition, or alternatively, this may allow current to be conducted through the bridging material, effectively improving the electrical properties between the battery terminals and the electrode sheets. Specifically, the internal resistance between the electrode sheets (especially due to their deflected shape) and the battery terminals may be significantly reduced by thermally and / or electrically conductive bridging materials. Although the connection between the electrode sheets and the battery terminals may typically be a bottleneck for charging, particularly fast charging, this problem can be overcome by the bridging material proposed herein.

[0024] In one example, the bridging material may be a paste and / or an adhesive. The advantage of the stickiness of the paste or adhesive is that the bridging material is somewhat flexible to the electrode sheet surrounded by the bridging material to obtain better conductive properties. As an adhesive, the bridging material can further enhance the structural performance. Once the electrode sheet is thus enclosed, the adhesive can harden, or in other words, become solid, which strengthens the structure and can ensure that the electrolyte in the battery cell (which can be a liquid type) does not mix with the bridging material.

[0025] By means of the bridging material proposed herein, an improved electrode sheet to battery terminal design is provided, potentially resolving the problem of limited charging current due to the setback described in the introduction to this specification. The bridging material allows for higher currents and better heat dissipation from the electrode assembly inside the battery cell. This can reduce the required cooling power and even allow for a reduction in the size of the cooling system for battery elements including the battery cell as disclosed herein. Thus, by means of the battery cell disclosed herein, further benefits such as reduced vehicle cost and weight can be achieved.

[0026] In one example, the other electrode material and / or separator material inside the housing can be spaced apart from the bridging material. Thus, the other electrode material and / or separator material can be electrically isolated from the electrode material with the electrode sheet to prevent short circuits.

[0027] According to a second aspect, there is provided a vehicle comprising a battery element having at least one battery cell according to the first aspect of the present disclosure.

[0028] The vehicle may be of any type, such as a hybrid electric vehicle or a battery electric vehicle. The battery element may be of any type, such as a traction battery element.

[0029] According to a third aspect of the present disclosure, there is provided a method for manufacturing a battery cell, the method comprising:

[0030] providing a housing having a wall and at least one battery terminal,

[0031] providing at least one electrode material having an electrode sheet for electrical connection to at least one battery terminal,

[0032] The at least one electrode material is inserted into the housing such that at least parts of the electrode material extend along a wall inside the housing and a deflection structure of the battery cell, in particular the housing, deflects, in particular bends, at least some of the electrode sheets away from the wall.

[0033] In one example, the method may comprise further steps, such as providing a bridging material in the housing, in particular directly at the battery terminals, further in particular before inserting the at least one electrode material into the housing.

[0034] In one example, the electrode material can be inserted into the housing as or with a complete electrode assembly, which can have another electrode material and a separator material, as described herein, and can be in a jellyroll form, for example.

[0035] In one example, the method may further include heating a first end of the housing, the first end being where the electrode sheet, in particular the battery terminal, is located, to join the electrode sheet to at least one battery terminal. Any joining method including providing heat may be used, such as but not limited to brazing. Thus, the inside of the first end of the housing may be coated with a pre-flux, such as tin. A connection between the first end and the electrode sheet may be formed by applying heat to the first end, which may be a bottom plate or side of the housing.

[0036] It should be noted that the above-mentioned aspects, examples and features may be combined with each other irrespective of the aspect involved.

[0037] The above and other aspects of the present disclosure will become apparent with reference to the examples described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Examples of the present disclosure will be described below with reference to the accompanying drawings shown below:

[0039] Figure 1 is a cross-sectional view of a battery cell according to the prior art;

[0040] Figure 2 is a cross-sectional view of a battery cell according to the present disclosure;

[0041] Figure 3 is another cross-sectional view of a battery cell according to the present disclosure;

[0042] Figure 4 yes Figure 3 A battery cell including details of an electrode assembly according to the present disclosure;

[0043] Figure 5 yes Figure 3 A battery cell further comprising a bridging material according to the present disclosure; and

[0044] Figure 6 It is used to manufacture Figure 5 A method for a battery cell. DETAILED DESCRIPTION

[0045] The drawings are schematic diagrams only and serve only to illustrate examples of the present disclosure. In principle, identical or equivalent elements have the same reference numerals.

[0046] The names of elements and steps are first, second, etc. As provided herein, it is only to make elements and steps mutually referenced and distinguishable. The designation of elements and steps does not constitute a limitation on the scope of the present disclosure. For example, when the present disclosure describes the third step of the method, the first or second step of the method does not need to exist or execute separately before the third step, unless they are explicitly referred to as themselves needing or before the third step. In addition, presenting elements or steps in a particular order is only an example for the convenience of the present disclosure, and does not constitute a limitation on the scope of the present disclosure. Usually, unless the order clearly required is mentioned, these steps can be performed in any feasible order.

[0047] Figure 1 A battery cell 10 according to the prior art is shown, as well as a cross-sectional view of the battery cell 10. The battery cell 10 comprises a housing 20, which in this example is cylindrical. The housing 20 is essentially formed by a cylindrical or container portion 21, a second end portion 24 and a first end portion 25. The housing has a first end 27 at the first end portion 25, which can be designed as a cover or a plate, for example, and has a second end 26 at the second end portion 24, which can be designed as a cover or a plate, for example. The first battery terminal 30 of the battery cell 10 is arranged at the first end 27, and the second battery terminal 40 is arranged at the second end 26.

[0048] The battery cell 10 also includes an electrode assembly 12. In the electrode assembly, there may be two electrode materials, which may be connected to battery terminals 30, 40, respectively.

[0049] In order to reduce the number of manufacturing steps required to produce a high-conductivity battery cell 10 with better charging performance, it is proposed that Figures 2 to 5 The battery cell 10 is shown.

[0050] For example, the battery cell 10 may be designed with reference Figure 1 Some or all of the features described. Figure 2 The battery cell 10 and Figure 1 The difference is at least that the battery cell 10 includes a deflection structure 80. The deflection structure 80 is configured to bend the electrode material 50 of the electrode assembly 12, as will be referred to in Figure 4 Described in more detail.

[0051] like Figure 2 As shown, the deflection structure 80 can be a separate structure inside the housing 20, or it can be included in the housing 20, especially integrally formed therewith. The deflection structure 80 can extend along part, most, or substantially all or the entire periphery of the wall 22 of the housing 20 and / or the interior of the cylindrical or container portion 21. Figure 2 In the example of , the deflection structure 80 can be formed by chamfering the inside of the wall 22 of the housing 20, or as a separate structure inserted into the housing 20 and located at the wall 22 thereof. Here, the wall 22 is provided at the cylindrical or container portion 21 of the housing 20.

[0052] Figure 3 An alternative embodiment of a deflection structure 80 is shown, which is formed by a wall portion 23 of a wall 22 of the housing 20. The wall portion 23 or the deflection structure 80 is in particular formed as a chamfered portion or chamfer of the wall 22. Figure 2 In contrast, the deflection structure 80 is arranged both inside and outside the housing 20 , which means that it can be seen both inside and outside the housing 20 .

[0053] exist Figure 2 and Figure 3 In the embodiment shown, the deflection structure 80 is arranged or located at the first end 25 of the battery cell 10 , where the first battery terminal 30 is formed.

[0054] Figure 2 or Figure 3 The first battery terminal 30 may be formed by the entire housing 20 , while the second battery terminal 40 may be located at an opening of the second end portion 24 of the housing 20 , for example.

[0055] Figure 4 Shows Figure 3 How the deflection structure 80 of the battery cell 10 affects the electrode assembly 12 inside the battery cell 10. Here, the electrode assembly 12 is only partially shown as a part of the battery cell 10 and is only an illustrative example. Of course, the electrode assembly 12 may include more Figure 4 Shown are further layers of electrode material 50, 60 and separator material 70. Furthermore, the bending of the electrode sheet 51 by the deflection structure 80 (as explained further below) is only illustratively shown here to explain the bending provided by the deflection structure 80.

[0056] like Figure 4As shown, first portions of the two electrode materials 50, 60 extend along the wall 22 of the cylindrical portion 21 of the housing 20 while being separated by a separator material 70. An electrolyte of, for example, a liquid type may be provided in the housing 20.

[0057] In order to guide the electrode sheet 51 (also referred to as the first electrode sheet 51) of the electrode material 50 (also referred to as the first electrode material 50) to the first battery terminal 30, the deflection structure 80 deflects (especially bends) the electrode sheet 51 away from the wall 22 of the housing. Figure 2 As shown, the electrode sheet 51 is bent away from the wall 22 toward the center C of the battery cell 10 in the deflection direction D shown. As a result, the electrode sheet 51 in the second portion of the electrode material 50 is bent away from the remaining portion or the first portion of the first electrode material 50, as shown in FIG. Figure 4 As explained, the first electrode material 50 can be distinguished by two parts, namely a first part extending parallel to the wall 22 and a second part having an electrode sheet 51 bent away from the first part.

[0058] Figure 4 For illustration only, it is not shown how the electrode sheets 51 are bent so that they overlap each other. The electrode sheets 51 can be deviated from each other so that they are in direct contact with each other, in particular, push themselves toward the center C, and establish electrical contact between each other. Thus, a flower-like pattern of the electrode sheets 51 can be produced at the first end portion 25 of the battery cell 10. This flower-like pattern allows high conductivity between the electrode sheets 51 and the first battery terminal 30.

[0059] Figure 4 Further shown is a second electrode sheet 61 of a second electrode material 60 which may be connected similarly to the first electrode sheet 51 or in another manner to a second battery terminal 40 which may be a positive battery terminal as opposed to the first battery terminal 30 which is a negative battery terminal.

[0060] In order to further improve the conductivity of the connection between the electrode sheet 51 and the first battery terminal 30, a bridging material 90 is provided between the first battery terminal 30 at the first end portion 25 and the electrode sheet 51 that contacts (especially overlaps) each other. The bridging material 90 has a thickness T so that it does not contact the second electrode material 60 and the separator material 70. For example, the bridging material 90 may be thermally and / or electrically conductive and is designed as a paste and / or an adhesive.

[0061] Figure 6 Describes the manufacturing Figure 5 The steps of method 100 of battery cell 10 are shown.

[0062] In a first step 101 of the method 100 , a housing 20 having a wall 22 and a first battery terminal 30 is provided.

[0063] In a second step 102 of the method 100 , an electrode assembly 12 having two electrode materials 50 , 60 , electrode sheets 51 , 61 and separator material 70 is provided for insertion into the housing 20 when the second end portion 24 and / or the first end portion 25 is open, ie the housing 20 is not closed.

[0064] In a third step 103 , a bridging material 90 is provided at the first end portion 25 of the housing 20 .

[0065] In a fourth step 104 of method 100, the electrode assembly 12 is inserted into the housing 20 so that a first portion of the electrode material 50 extends along the wall 22 within the housing 20, and the deflection structure 80 of the housing 20 causes at least some of the electrode sheets 51 to bend away from the wall 22 so that they overlap each other, particularly in the above-mentioned flower-like pattern.

[0066] In a fifth step 105 of the method 100 , the housing 20 is closed. This may include brazing the first end portion 25 to join the electrode tab 51 to the first battery terminal 30 .

[0067] By studying the drawings, the disclosure and the appended claims, a person skilled in the art may understand and implement other variations of the disclosed examples when implementing the claimed disclosure. In the claims, the words "comprising" or "having" do not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The fact that certain measures are cited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0068] Reference Symbols List

[0069] 10 battery cells

[0070] 12 electrode assembly

[0071] 20 Shell

[0072] 21 cylindrical part

[0073] 22 walls

[0074] 23 Wall section

[0075] 24 Second terminal portion

[0076] 25 First terminal part

[0077] 26 Second End

[0078] 27 First End

[0079] 30 First battery terminal

[0080] 40 Second battery terminal

[0081] 50First electrode material

[0082] 51 first electrode sheet

[0083] 60 Second electrode material

[0084] 61 second electrode sheet

[0085] 70 separator material

[0086] 80 deflection structure

[0087] 90 Bridging Materials

[0088] 100 Methods

[0089] 101 First Step

[0090] 102 Second Step

[0091] 103 Third Step

[0092] 104 Step 4

[0093] 105 Fifth Step

[0094] C Center

[0095] D Deflection direction

[0096] T thickness

Claims

1. A battery cell (10) comprising a housing (20) having a wall (22) and at least one battery terminal (30, 40), the battery cell (10) comprising an electrode material (50) having an electrode sheet (51), at least a portion of the electrode material (50) extending along the wall (22) within the housing (20), the electrode sheet (51) being electrically connected to the at least one battery terminal (30, 40), and the battery cell (10) further comprising a deflection structure (80) configured to deflect at least some of the electrode sheets (51) away from the wall (22).

2. The battery cell (10) according to claim 1, wherein the housing (20) includes at least a portion of the deflection structure (80).

3. The battery cell (10) according to claim 1 or 2, the deflection structure (80) being at least partially formed by a wall portion (23) of the wall (22).

4. The battery cell (10) according to claim 3, wherein the wall portion (23) is a chamfered portion of the wall (22).

5. The battery cell (10) according to claim 3, the wall portion (23) at least partially forming the deflection structure (80) being arranged at one of two opposite end portions (24, 25) of the housing (20).

6. The battery cell (10) according to claim 1 or 2, at least some of the electrode sheets (51) overlap each other.

7. The battery cell (10) according to claim 1 or 2, wherein the housing (20) is cylindrical, and the housing (20) has an electrode assembly (12), the electrode assembly (12) includes the electrode sheet (51) and is a roll type.

8. The battery unit (10) according to claim 1 or 2, at least a portion of the housing (20) being configured as the at least one battery terminal (30, 40).

9. The battery cell (10) according to claim 1 or 2, the housing (20) comprising a bridging material (90) which structurally connects the electrode sheet (51) and the at least one battery terminal (30, 40).

10. The battery cell (10) according to claim 9, wherein the bridging material (90) is thermally and / or electrically conductive.

11. The battery cell (10) according to claim 9, wherein the bridging material (90) is a paste and / or an adhesive.

12. The battery cell (10) according to claim 9, wherein another electrode material (60) and / or a separator material (70) in the housing (20) is spaced apart from the bridging material (90).

13. A vehicle comprising a battery element having at least one battery cell (10) according to any one of the preceding claims.

14. A method (100) for manufacturing a battery cell (10), the method (100) comprising: providing a housing (20) having a wall (22) and at least one battery terminal (30, 40), providing at least one electrode material (50) having an electrode sheet (51) for electrical connection to the at least one battery terminal (30, 40), The at least one electrode material (50) is inserted into the housing (20) such that at least a portion of the electrode material (50) extends along the wall (22) within the housing (20), and the deflection structure (80) of the battery cell (10) deflects at least some of the electrode sheets (51) away from the wall (22).

15. The method (100) according to claim 14, further comprising: A first end portion (25) of the housing (20), where the electrode sheet (51) is located, is heated to bond the electrode sheet (51) to the at least one battery terminal (30, 40).

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