Battery cell shell and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell shell and a battery cell. The battery cell shell comprises a shell body, and an opening communicated with the inside and the outside is formed in at least one end of the shell body in the first preset direction; the side wall of the opening comprises a variable wall area and a non-variable wall area which are sequentially arranged from the outside of the shell to the inside of the shell along a first preset direction; the wall thickness of the variable wall area is gradually increased from the outside of the shell to the inside of the shell in the first preset direction, and the inner wall of the variable wall area is obliquely arranged; an assembling end face is formed at the end, away from the invariable wall area, of the variable wall area. The wall-variable area is designed at the open end for assembling the battery cell shell and the shell cover, so that the inner side wall of the open end is inclined, on one hand, a guiding effect is achieved, and on the other hand, the problem of excessive extrusion deformation after the shell and the shell cover are matched can be avoided, so that the efficiency and the precision when the shell and the shell cover are assembled are greatly improved; and the subsequent welding precision and yield can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell housing and a battery cell. Background Art

[0002] Currently, a battery cell includes a housing, an electrode assembly, and a housing cover. Among them, the electrode assembly is installed inside the housing, and the housing cover is installed at the open end of the housing. Currently, a plug-in portion is provided on the housing cover. After the housing cover is installed on the housing, the plug-in portion can be inserted into the open end of the housing. During the installation process, the situation where it cannot be accurately inserted in place often occurs, resulting in low assembly efficiency, poor accuracy, and thus low welding yield. Summary of the Invention

[0003] The purpose of this application is to provide a battery cell housing and a battery cell, which to a certain extent solve the technical problem existing in the prior art that during the assembly of the housing cover and the housing of the battery cell housing, the situation of incomplete assembly often occurs, resulting in low assembly efficiency, poor accuracy, and thus low welding yield.

[0004] This application provides a battery cell housing, including a housing. Along a first preset direction, at least one end of the housing is formed with an opening communicating with its interior and the outside world, and the side wall of the opening includes a variable wall thickness region and a constant wall thickness region sequentially arranged along the first preset direction from the outside of the housing towards its interior; along the first preset direction from the outside of the housing towards its interior, the wall thickness of the variable wall thickness region gradually increases, and the inner wall of the variable wall thickness region is inclined; an assembly end face is formed at one end of the variable wall thickness region far from the constant wall thickness region.

[0005] In the above technical solution, further, along the first preset direction, the length of the variable wall thickness region is A, and 0.2 mm ≤ A ≤ 0.8 mm.

[0006] In any of the above technical solutions, further, the wall thickness of the constant wall thickness region is T, and the wall thickness of the end of the variable wall thickness region far from the constant wall thickness region is B, and 0.5×T ≤ B ≤ 0.8×T.

[0007] In any of the above technical solutions, further, the wall thickness of the constant wall thickness region is T, and T.

[0008] In any of the above technical solutions, further, the assembly end face is arranged perpendicular to the first preset direction.

[0009] In any of the above technical solutions, further, a nickel plating layer is provided on the inner wall of the housing.

[0010] In any of the above technical solutions, further, the housing includes a side housing and an end cover connected to each other; wherein, the side housing has a hollow interior and two open ends, and the end cover seals one of the open ends of the side housing; the thickness of the nickel plating layer provided on the inner wall of the side housing is t1, and t1 ≥ 0.1 μm; the thickness of the nickel plating layer provided on the inner wall of the end cover is t2, and t2 ≥ 0.1 μm.

[0011] In any of the above technical solutions, further, a nickel plating layer is provided on the outer wall of the housing.

[0012] In any of the above technical solutions, further, the housing includes a side housing and an end cover connected to each other; wherein, the side housing has a hollow interior and two open ends, and the end cover seals one of the open ends of the side housing; the thickness of the nickel plating layer provided on the outer wall of the side housing is t3, and t3 ≥ 1.3 μm; the thickness of the nickel plating layer provided on the outer wall of the end cover is t4, and 1.3 μm ≤ t4 ≤ 2 μm. The present application also provides an electric core, which includes a pole group, a case cover, and the electric core housing according to any of the above technical solutions. The case cover is installed at the opening of the electric core housing and is used to seal the pole group inside the electric core housing. Therefore, all the beneficial technical effects of the electric core housing are achieved, and details are not described herein again.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows:

[0014] For the electric core housing provided by the present application, a variable wall region is designed at the opening end where it is assembled with the case cover, and along a first preset direction and from the inside of the housing towards its outside, the wall thickness of the variable wall region gradually decreases. That is to say, the inner side wall of the opening end of the housing is inclined. When assembled with the case cover, on the one hand, it plays a guiding role, and on the other hand, it can also avoid the problem of excessive extrusion deformation after the two are fitted. It can be seen that the efficiency and precision of the assembly of the housing and the case cover are greatly improved, and it is also helpful to improve the subsequent welding precision and yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the electric core housing provided by the embodiment of the present application;

[0017] Figure 2A cross-sectional view of the battery cell housing provided by the embodiment of the present application;

[0018] Figure 3 is Figure 2 an enlarged schematic structural view at A.

[0019] Reference numerals:

[0020] 1 - housing, 11 - side housing, 111 - opening, 1111 - variable wall region, 1112 - constant wall region, 1113 - assembly end face, 12 - end cap. Detailed implementation manners

[0021] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application.

[0022] The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0023] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0024] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0026] Next, refer to Figures 1 to 3 to describe the battery cell housing and the battery cell according to some embodiments of the present application.

[0027] Example 1

[0028] See Figures 1 to 3 As shown, an embodiment of the present application provides a battery cell housing, including a housing 1. Along a first preset direction a, at least one end of the housing 1 is formed with an opening 111 communicating with its interior and the outside, and the side wall of the opening 111 includes a variable wall region 1111 and a non-variable wall region 1112 arranged in sequence along the first preset direction a from the outside to the inside of the housing 1; along the first preset direction a from the outside to the inside of the housing 1, the wall thickness of the variable wall region 1111 gradually increases, and the inner wall of the variable wall region 1111 is inclined; an assembly end face 1113 is formed at one end of the variable wall region 1111 away from the non-variable wall region 1112.

[0029] According to the structure described above, for the battery cell housing provided by the present application, a variable wall region 1111 is designed at the opening end where it is assembled with the housing cover. And along the first preset direction a from the outside to the inside of the housing 1, the wall thickness of the variable wall region 1111 gradually increases. That is to say, the inner side wall of the opening end of the housing 1 is inclined. When assembled with the housing cover, on the one hand, it plays a guiding role, and on the other hand, it can also avoid the problem of excessive extrusion deformation after the two are matched. It can be seen that the efficiency and precision of the assembly of the housing 1 and the housing cover are greatly improved, and it is also helpful to improve the subsequent welding precision and yield.

[0030] Further, preferably, along the first preset direction a, only one end of the housing 1 is formed with an opening 111 communicating with its interior and the outside. Of course, it is not limited to this, and both ends of the housing 1 can also be formed with the aforementioned opening 111, which is specifically designed according to actual needs.

[0031] In this embodiment, preferably, as Figure 3 shown, along the first preset direction a, the length of the variable wall region 1111 is A, and 0.2 mm ≤ A ≤ 0.8 mm.

[0032] According to the structure described above, along the first preset direction a, if the length A of the variable wall region 1111 is too small, the cooperation between the housing 1 and the housing cover is poor, and finally the welding yield of the housing 1 and the housing cover is reduced; along the first preset direction a, if the length A of the variable wall region 1111 is too large, the upper surface of the housing cover is lower than the housing 1, and welding cannot be performed. Therefore, by making the length A of the variable wall region 1111 take values in the range of 0.2 mm - 0.8 mm along the first preset direction a, precise assembly of the housing 1 and the housing cover can be ensured, which is convenient for subsequent welding and greatly improves the welding yield.

[0033] It should be noted that: not limited to the above value range, the length A of the variable wall region 1111 can also be made A < 0.2 mm, or the length A of the variable wall region 1111 can be made A > 0.8 mm, and the specific selection is based on actual needs.

[0034] In this embodiment, preferably, as Figure 3 shown, the wall thickness of the constant wall region 1112 is T, and the wall thickness of the end of the variable wall region 1111 far from the constant wall region 1112 is B. That is to say, the width of the assembly end face 1113 is B, and 0.5×T ≤ B ≤ 0.8×T.

[0035] According to the structure described above, if the wall thickness B of the end of the wall region far from the constant wall region 1112 is too small, the support area of the assembly end face 1113 of the housing 1 for the housing cover is too small, and the support effect is not good, ultimately affecting the welding of the housing 1 and the housing cover; if the wall thickness B of the end of the wall region far from the constant wall region 1112 is too large, it is not convenient for the housing cover to be assembled with the housing 1. Therefore, the wall thickness B of the end of the wall region far from the constant wall region 1112 is preferably within the range of 0.5×T - 0.8×T, which can not only ensure that the housing 1 has sufficient support area for the housing cover, but also ensure the assembly effect.

[0036] It should be noted that: not limited to the above value range, the wall thickness B of the end of the variable wall region 1111 far from the constant wall region 1112 can also be made B < 0.5×T, or the wall thickness B of the end of the variable wall region 1111 far from the constant wall region 1112 can be made B > 0.8×T, and the specific selection is based on actual needs.

[0037] In this embodiment, preferably, as Figure 3 shown, along the direction perpendicular to the first preset direction a, the wall thickness of the constant wall region 1112 is T, and 0.4 mm ≤ T ≤ 0.8 mm, which meets the requirements such as strength and conforms to the current usage requirements. Of course, not limited to this, T can also be made T < 0.4 mm, or T > 0.8 mm, and the specific selection is based on actual needs.

[0038] In summary, in order to further verify the influence of the size of the variable wall region 1111 on the assembly process of the battery cell housing and the housing cover, corresponding experiments were carried out, and the specific experimental data and conclusions are shown in Table 1 below:

[0039]

[0040]

[0041]

[0042] Table 1

[0043] Combined with the above experiments, it can be seen that along the first preset direction a, if the length A of the variable wall region 1111 is too small, the cooperation between the housing 1 and the housing cover is poor, ultimately resulting in a reduction in the welding yield of the housing 1 and the housing cover; along the first preset direction a, if the length A of the variable wall region 1111 is too large, the upper surface of the housing cover is lower than the housing 1, and welding cannot be performed. Therefore, when the length A of the variable wall region 1111 takes a value within the range of 0.2 mm - 0.8 mm along the first preset direction a, it can ensure the precise assembly of the housing 1 and the housing cover, thereby facilitating subsequent welding and greatly improving the welding yield;

[0044] If the wall thickness B of the end of the wall region far from the constant wall region 1112 is too small, the supporting area of the assembly end face 1113 of the housing 1 for the housing cover is too small, and the supporting effect is poor, ultimately affecting the welding of the housing 1 and the housing cover; if the wall thickness B of the end of the wall region far from the constant wall region 1112 is too large, it is not convenient for the housing cover to be assembled with the housing 1. Therefore, when the wall thickness B of the end of the wall region far from the constant wall region 1112 takes a value within the range of 0.5×T - 0.8×T, it can not only ensure that the housing 1 has sufficient supporting area for the housing cover but also ensure the assembly effect;

[0045] Along the direction perpendicular to the first preset direction a, the wall thickness of the constant wall region 1112 is T, and 0.4 mm ≤ T ≤ 0.8 mm, which meets requirements such as strength and conforms to the current usage needs.

[0046] It can be seen that reasonable selection of the values of T, A, and B is required to ensure that after the housing and the housing cover, that is, the housing cover, are assembled, a wire is generated, and the welding yield of the housing cover > 99.9%.

[0047] In this embodiment, preferably, as Figure 3 shown, the assembly end face 1113 is arranged perpendicular to the first preset direction a.

[0048] According to the structure described above, the assembly end face 1113 is designed as a planar structure, and it is a plane perpendicular to the first preset direction a, which is more convenient for assembling with the housing cover and helps to improve the assembly accuracy and stability after assembly.

[0049] It should be noted that: it is not limited to the assembly end face 1113 being arranged perpendicular to the first preset direction a, and it can also form an acute angle with the first preset direction a, etc., which is specifically selected according to actual needs.

[0050] In this embodiment, preferably, as Figure 1 and Figure 2 shown, a nickel plating layer (not shown) is provided on the inner wall of the housing 1.

[0051] According to the structure described above, a nickel plating layer is provided on the inner wall of the housing 1, which can effectively prevent the electrolyte from corroding the steel shell, thereby helping to ensure the performance and lifespan of the battery.

[0052] In this embodiment, preferably, as Figure 1 and Figure 2 shown, the housing 1 includes a connected side housing 11 and an end cap 12; wherein, the side housing 11 has a structure that is hollow inside and has openings 111 at both ends, and the end cap 12 seals one of the openings 111 of the side housing 11; the thickness of the nickel plating layer provided on the inner wall of the side housing 11 is t1, and t1 ≥ 0.1 μm; the thickness of the nickel plating layer provided on the inner wall of the end cap 12 is t2, and t2 ≥ 0.1 μm.

[0053] According to the structure described above, if the thickness t1 of the nickel plating layer provided on the inner wall of the side housing 11 is too small, it will not play a role in anti-corrosion, so t1 ≥ 0.1 μm; similarly, if the thickness t2 of the nickel plating layer provided on the inner wall of the end cap 12 is too small, it will not play a role in anti-corrosion, so t2 ≥ 0.1 μm.

[0054] It should be noted that: the structure of the housing 1 is not limited to the above, and it may also only include the side housing 11, that is to say, the housing 1 has a structure that is hollow inside and has openings at both ends.

[0055] In this embodiment, preferably, as Figure 1 and Figure 2 shown, a nickel plating layer (the nickel plating layer is not shown) is provided on the outer wall of the housing 1.

[0056] According to the structure described above, providing a nickel plating layer on the outer wall of the housing 1 can play a role in anti-corrosion, thereby helping to ensure the performance and lifespan of the battery.

[0057] In this embodiment, preferably, as Figure 1 and Figure 2 shown, the housing 1 includes a connected side housing 11 and an end cap 12; wherein, the side housing 11 has a structure that is hollow inside and has openings 111 at both ends, and the end cap 12 seals one of the openings 111 of the side housing 11; the thickness of the nickel plating layer provided on the outer wall of the side housing 11 is t3, and t3 ≥ 1.3 μm; the thickness of the nickel plating layer provided on the outer wall of the end cap 12 is t4, and 1.3 μm ≤ t4 ≤ 2 μm.

[0058] According to the structure described above, if the thickness t3 of the nickel plating layer provided on the outer wall of the side shell 11 is too small, it cannot play a role in corrosion prevention, and thus t3 ≥ 1.3 μm; similarly, if the thickness t4 of the nickel plating layer provided on the outer wall of the end cover 12 is too small, it cannot play a role in corrosion prevention, and if the thickness t4 of the nickel plating layer provided on the inner wall of the end cover 12 is too large, the material cost is relatively high, and thus 1.3 μm ≤ t4 ≤ 2 μm.

[0059] It should be noted that: the structure of the shell 1 is not limited to the above, and it may also only include the side shell 11, that is to say, the shell 1 has a structure with a hollow interior and openings at both ends.

[0060] In summary, in order to further verify the influence of the thickness of the nickel plating layer at different positions on the corrosion resistance of the battery cell, etc., corresponding experiments were carried out, and the specific experimental data and conclusions are shown in Table 2 below:

[0061]

[0062]

[0063] Table 2

[0064] Combined with the above experiments, if the thickness t1 of the nickel plating layer provided on the inner wall of the side shell 11 is too small, it cannot play a role in corrosion prevention, and thus t1 ≥ 0.1 μm; similarly, if the thickness t2 of the nickel plating layer provided on the inner wall of the end cover 12 is too small, it cannot play a role in corrosion prevention, and thus t2 ≥ 0.1 μm;

[0065] If the thickness t3 of the nickel plating layer provided on the outer wall of the side shell 11 is too small, it cannot play a role in corrosion prevention, and thus t3 ≥ 1.3 μm; similarly, if the thickness t4 of the nickel plating layer provided on the outer wall of the end cover 12 is too small, it cannot play a role in corrosion prevention, and if the thickness t4 of the nickel plating layer provided on the inner wall of the end cover 12 is too large, the material cost is relatively high, and thus 1.3 μm ≤ t4 ≤ 2 μm.

[0066] It can be seen that the values of t1, t2, t3 and t4 need to be reasonably selected to play a role in corrosion prevention while reducing costs.

[0067] Embodiment 2

[0068] Embodiment 2 of the present application further provides a battery cell, including a pole group, a shell cover and the battery cell shell described in Embodiment 1 above, wherein the shell cover is installed at the opening of the battery cell shell, and the shell cover is used to seal the pole group in the battery cell shell. Therefore, it has all the beneficial technical effects of the battery cell shell, and the same technical features and beneficial effects will not be repeated.

[0069] It should be noted that: the number of the shell covers is the same as the number of the openings 111 of the battery cell housing. Preferably, in this embodiment, when the battery cell housing is formed with one opening 111, the number of the shell covers is also one and is installed at this opening 111. Of course, it is not limited thereto. The battery cell housing may also be formed with two oppositely arranged openings 111, and then each opening 111 is provided with one of the aforementioned shell covers, which is specifically designed according to actual needs.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell housing, characterized in that, It includes a housing, and along a first preset direction, at least one end of the housing is formed with an opening communicating with its interior and the outside world, and the side wall of the opening includes a variable wall region and a constant wall region that are sequentially arranged along the first preset direction and from the outside of the housing towards its interior; along the first preset direction and from the outside of the housing towards its interior, the wall thickness of the variable wall region gradually increases, and the inner wall of the variable wall region is inclined; an assembly end face is formed at one end of the variable wall region away from the constant wall region.

2. The cell housing according to claim 1, wherein Along the first preset direction, the length of the variable wall region is A, and 0.2 mm ≤ A ≤ 0.8 mm.

3. The cell housing according to claim 1, wherein Along the direction perpendicular to the first preset direction, the wall thickness of the constant wall region is T, and the wall thickness of the end of the variable wall region away from the constant wall region is B, and 0.5×T ≤ B ≤ 0.8×T.

4. The cell housing according to claim 1, wherein Along the direction perpendicular to the first preset direction, the wall thickness of the constant wall region is T, and 0.4 mm ≤ T ≤ 0.8 mm.

5. The cell housing according to claim 1, characterized in that, The assembly end face is arranged perpendicular to the first preset direction.

6. The cell housing according to claim 1, wherein A nickel plating layer is provided on the inner wall of the housing.

7. The cell housing according to claim 6, characterized in that, The housing includes a connected side housing and an end cap; wherein, the side housing has a hollow interior and openings at both ends, and the end cap seals one opening of the side housing; the thickness of the nickel plating layer provided on the inner wall of the side housing is t1, and t1 ≥ 0.1 μm; the thickness of the nickel plating layer provided on the inner wall of the end cap is t2, and t2 ≥ 0.1 μm.

8. The cell housing according to any one of claims 1 to 7, characterized in that A nickel plating layer is provided on the outer wall of the housing.

9. The cell housing according to claim 8, wherein The housing includes a connected side housing and an end cap; wherein, the side housing has a hollow interior and openings at both ends, and the end cap seals one opening of the side housing; the thickness of the nickel plating layer provided on the outer wall of the side housing is t3, and t3 ≥ 1.3 μm; the thickness of the nickel plating layer provided on the outer wall of the end cap is t4, and 1.3 μm ≤ t4 ≤ 2 μm.

10. A battery cell, characterized in that, It includes a pole group, a shell cover, and the battery cell housing according to any one of claims 1 to 9, and the shell cover is installed at the opening of the battery cell housing and is used to seal the pole group in the battery cell housing.

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