Top cover assembly, battery shell and power battery

Abstract

The embodiment of the utility model discloses a top cover assembly, a battery shell and a power battery, and relates to the technical field of new energy batteries. The top cover assembly comprises a top cover, an upper pole block and a pole, the top cover is provided with a pole hole, the upper pole block is provided with a through hole communicated with the pole hole, the pole comprises a folded edge, a first pole body and a second pole body which are sequentially arranged in the axial direction of the pole hole, the second pole body is installed in the pole hole, the first pole body is arranged in the through hole and attached to the upper pole block, and the folded edge abuts against the upper pole block. The upper pole block is clamped on the top cover, and the first pole body is attached to the upper pole block, so that the attaching area of the pole and the upper pole block is large, the resistance is small, the overcurrent capacity is high, the folded edge abuts against the upper pole block, the pole is limited in the axial direction, the push-pull force of the pole relative to the top cover is increased, the pole is small in installation stress and not prone to deformation, the finished product size stability is high, and the electrical clearance is guaranteed; and the influence on parts (upper plastic and the top cover) outside the pole in the pole mounting process is small, and the pole is not easy to deform, so that the sealing ring is stable in pressure and reliable in sealing.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a top cover assembly, a battery casing and a power battery. Background Technology

[0002] Current new energy batteries, especially automotive power batteries, tend to adopt a narrow and long rectangular cell structure in order to improve the overall energy density of the battery pack and the performance of the cells. When connecting the terminal post to the upper electrode block (which provides the connection to the busbar, usually made of aluminum), the terminal post head is typically crimped first, followed by welding the terminal post to the upper electrode block. This creates an inverted structure on the terminal post, increasing the push-pull force and allowing current to flow smoothly from the inside to the outside of the cell. However, due to the uncontrollable crimping pressure, the terminal post can deform, reducing or disabling the functions of the top cover (insulation, sealing, etc.). Furthermore, the limited area of ​​the terminal post crimped and welded to the upper electrode block results in a limited contact area, leading to limited current carrying capacity (insufficient current carrying capacity). Utility Model Content

[0003] Therefore, it is necessary to provide a top cover assembly, a battery casing, and a power battery to solve the problem that the deformation of the terminal post caused by uncontrollable riveting pressure leads to a reduction or failure of the relevant functions of the top cover (insulation, sealing, etc.). Furthermore, the limitation of the area where the terminal post is riveted to the upper electrode block results in a limited contact area between the terminal post and the upper electrode block, leading to a limitation in current carrying capacity (insufficient current carrying capacity).

[0004] In a first aspect, the present invention provides a top cover assembly, comprising: a top cover, an upper electrode block, and an electrode post. The top cover has an electrode post hole, the upper electrode block has a through hole communicating with the electrode post hole, and the electrode post includes a flange, a first column, and a second column arranged sequentially along the axial direction of the electrode post hole. The second column is installed in the electrode post hole, the first column is disposed in the through hole and fits against the upper electrode block, and the flange abuts against the upper electrode block, clamping the upper electrode block to the top cover.

[0005] In one embodiment, the upper electrode block has a groove disposed around the through hole, and the folded edge is received in the groove.

[0006] In one embodiment, the upper pole block has a first step at the end of the groove near the through hole, and a second step is provided on the outer side of the connection between the folded edge and the first column. The first step, the second step, and the folded edge enclose a closed space.

[0007] In one embodiment, a third step is provided at the connection position between the first column and the second column, and the third step abuts against the end of the upper pole block away from the groove.

[0008] In one embodiment, the plane of the side of the folded edge away from the first column is lower than the plane of the side of the upper pole block away from the top cover.

[0009] In one embodiment, the pole post further includes a lower pole block, and the side of the second post away from the first post is connected to the lower pole block.

[0010] In one embodiment, the first column and the second column are coaxially arranged, and the cross-sections of the first column and the second column have a major axis and a minor axis perpendicular to the axial direction of the pole hole, wherein the major axis is parallel to the length direction of the top cover.

[0011] In one embodiment, the top cover assembly further includes an upper plastic and a sealing ring. The upper plastic includes a first portion and a second portion connected to the first portion. The first portion is connected between the upper electrode block and the top cover. The second portion is connected between the second column and the top cover. The sealing ring surrounds the second column and is sandwiched between the top cover and the second column. One end of the second portion facing the sealing ring has a chamfer facing the second column, and the chamfer contacts the sealing ring.

[0012] The top cover assembly also includes a lower plastic layer, which is connected between the top cover and the lower electrode block.

[0013] Secondly, the present invention also provides a battery casing, the battery casing including a housing and a top cover assembly of any of the above embodiments, the housing and the top cover assembly forming a closed space.

[0014] Thirdly, this utility model also provides a power battery, which includes a battery cell and a battery casing as described in the above embodiment, wherein the battery cell is installed in the enclosed space.

[0015] Implementing the embodiments of this utility model will have the following beneficial effects:

[0016] The top cover assembly, battery casing, and power battery of this utility model have a top cover with a terminal hole, an upper electrode block with a through hole communicating with the terminal hole, a second terminal installed in the terminal hole, a first post set in the through hole and fitted with the upper electrode block, and a folded edge abutting against the upper electrode block, clamping the upper electrode block to the top cover. By setting the first post in the through hole and fitting against the upper electrode block, the contact area between the terminal and the upper electrode block is large, the resistance is low, and the current carrying capacity is enhanced. By abutting against the upper electrode block with the folded edge, the axial direction of the terminal is limited, increasing the pushing and pulling force of the terminal relative to the top cover. Compared with the riveting of the prior art, the installation of the terminal is less stressed, less prone to deformation, has high dimensional stability of the finished product, ensures electrical clearance, and the installation process of the terminal has little impact on parts other than the terminal (upper plastic, top cover), is less prone to deformation, and makes the sealing ring pressure stable and the sealing reliable. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] in:

[0019] Figure 1 This is an isometric schematic diagram of the top cover assembly in one embodiment.

[0020] Figure 2 for Figure 1 Side view of the top cover assembly shown.

[0021] Figure 3 This is a cross-sectional view along the AA direction of the top cover assembly shown in Figure 2.

[0022] Figure 4 for Figure 3 A partially enlarged schematic diagram of part B in the top cover assembly shown.

[0023] Figure label:

[0024] 1. Top cover; 11. Pole post hole;

[0025] 2. Upper pole block; 21. Through hole; 22. Groove; 23. First step;

[0026] 3. Pole post; 31. Folded edge; 311. Second step; 32. First column; 33. Second column; 331. Third step; 34. Lower pole block;

[0027] 4. Apply plastic; 41. First part; 42. Second part; 421. Chamfer;

[0028] 5. Sealing ring; 6. Bottom plastic. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] Please combine them together Figures 1 to 4 The top cover assembly provided by this utility model will now be described. The top cover assembly 1 is used in the battery casing of a power battery.

[0035] The top cover assembly includes a top cover 1, an upper electrode block 2, and an electrode post 3. The top cover 1 has an electrode post hole 11. The upper electrode block 2 has a through hole 21 that communicates with the electrode post hole 11. The electrode post 3 includes a folded edge 31, a first column 32, and a second column 33 arranged sequentially along the axial direction of the electrode post hole 3. The second column 33 is installed in the electrode post hole 11. The first column 32 is disposed in the through hole 21 and fits against the upper electrode block 2. The folded edge 31 abuts against the upper electrode block 2, clamping the upper electrode block 2 to the top cover 1.

[0036] It is understood that the top cover 1 of the top cover assembly has a pole hole 11, the upper pole block 2 has a through hole 21 connected to the pole hole 11, the second pole 3 is installed in the pole hole 11, the first pole body 32 is set in the through hole 21 and fits against the upper pole block 2, and the folded edge 31 abuts against the upper pole block 2, clamping the upper pole block 2 to the top cover 1. By setting the first pole body 32 in the through hole 21 and fitting against the upper pole block 2, the contact area between the pole 3 and the upper pole block 2 is large, the resistance is small, and the current carrying capacity is enhanced. By abutting against the upper pole block 2 through the folded edge 31, the pole 3 is limited in the axial direction, increasing the pushing and pulling force of the pole 3 relative to the top cover 1. The installation of the pole 3 is less stressed than the riveting of the prior art, is not easy to deform, has high dimensional stability of the finished product, ensures electrical clearance, and the installation process of the pole 3 has little impact on the parts other than the pole 3 (upper plastic 4, top cover 1), is not easy to deform, and makes the pressure of the sealing ring 5 stable and the sealing reliable.

[0037] It should be noted that the folded edge 31, the first column 32, and the second column 33 are integrally formed. The integral pole post 3 can improve the strength and reliability of the pole post 3, reduce the number of process steps, and reduce costs. The first column 32 is set in the through hole 21 and is attached to the upper pole block 2, or the first column 32 is fused to the upper pole block 2.

[0038] In this embodiment, the upper electrode block 2 has a groove 22 circumferentially disposed in the through hole 21, and the folded edge 31 is received in the groove 22. In this way, the folded edge 31 can be turned outward to press against the upper electrode block 2, thereby fixing it to the top cover 1. The groove 22 is used to support and limit the lower surface of the folded edge 31.

[0039] In one embodiment, such as Figure 4 As shown, the upper electrode block 2 has a first step 23 at the end of the groove 22 near the through hole 21, and a second step 311 is provided on the outer side of the connection between the folded edge 31 and the first column 32. The first step 23, the second step 311 and the folded edge 31 enclose a closed space. Specifically, the first step 23 and the second step 311 can provide fusion welding between the outer side of the first column 32 and the inner wall of the through hole 21, while reducing the deformation of the electrode column 3 caused by the folding of the folded edge 31.

[0040] In this embodiment, a third step 331 is provided at the connection position of the first column 32 and the second column 33. The third step 331 abuts against the end of the upper electrode block 2 away from the groove 22. The third step 331 can reduce the relative displacement of the contact surface between the upper electrode block 2 and the electrode post 3 when the upper electrode block 2 is pressed down after the folded edge 31.

[0041] Furthermore, the plane of the side of the folded edge 31 that is away from the first column 32 is lower than the plane of the side of the upper pole block 2 that is away from the top cover 1. This ensures that welding to the busbar (busbar or busbar) will not be affected.

[0042] In one embodiment, continue as follows Figure 4 As shown, the pole post 3 also includes a lower pole block 34. The side of the second pole 33 away from the first pole 32 is connected to the lower pole block 34. The pole post 3 is a structural component made entirely of non-composite materials. Specifically, the pole post 3 and the lower pole block 34 are made entirely of non-composite materials, such as pure copper or pure aluminum, to ensure the strength and reliability of the pole post 3 itself.

[0043] In one embodiment, continue as follows Figure 4 As shown, the first column 32 and the second column 33 are coaxially arranged, and the cross-sections of the first column 32 and the second column 33 have a major axis and a minor axis perpendicular to the axial direction of the hole of the pole post 3, with the major axis parallel to the length direction of the top cover 1. That is to say, the cross-section of the pole post 3 is a flat and elongated non-circular structure (it can be elliptical, rectangular, etc.), thereby improving the flow capacity of the pole post 3.

[0044] In one embodiment, continue as follows Figure 4 As shown, the top cover assembly also includes an upper plastic 4 and a sealing ring 5. The upper plastic 4 includes a first part 41 and a second part 42 connected to the first part 41. The first part 41 is connected between the upper electrode block 2 and the top cover 1, and the second part 42 is connected between the second post 33 and the top cover 1. The sealing ring 5 surrounds the second post 33 and is sandwiched between the top cover 1 and the second post 33. The end of the second part 42 facing the sealing ring 5 has a chamfer 421 facing the second post 33, and the chamfer 421 contacts the sealing ring 5. The upper plastic 4 isolates the electrode 3 from the top cover 1 to increase the electrical clearance and prevent short circuit between the electrode 3 and the top cover 1. The chamfer 421 facing the second post 33 at the end of the second part 42 facing the sealing ring 5, and the chamfer 421 contacting the sealing ring 5, can increase the electrical clearance, prevent current from flowing between the electrode 3 and the top cover 1, and reduce the material of the sealing ring 5, thus reducing the overall cost.

[0045] In this embodiment, the top cover 1 assembly further includes a lower plastic 6, which is connected between the top cover 1 and the lower electrode block 34. This allows for insulation between the top cover 1 and the lower electrode block 34.

[0046] The present invention also provides a battery casing, which includes a housing and a top cover 1 assembly of any of the above embodiments, wherein the housing and the top cover 1 assembly are arranged to form a closed space.

[0047] It is understood that the battery casing of this utility model uses the aforementioned top cover assembly, such that the top cover 1 of the top cover assembly has a terminal post hole 11, the upper electrode block 2 has a through hole 21 communicating with the terminal post hole 11, the second terminal post 3 is installed in the terminal post hole 11, the first post 32 is disposed in the through hole 21 and fits against the upper electrode block 2, the folded edge 31 abuts against the upper electrode block 2, clamping the upper electrode block 2 to the top cover 1. By setting the first post 32 to be disposed in the through hole 21 and fits against the upper electrode block 2, the... The electrode post 3 has a large contact area with the upper electrode block 2, resulting in low resistance and enhanced current carrying capacity. The folded edge 31 abuts against the upper electrode block 2, limiting the axial direction of the electrode post 3 and increasing the pushing and pulling force of the electrode post 3 relative to the top cover 1. Compared with the existing riveting technology, the installation of the electrode post 3 is subject to less force, is not easily deformed, has high dimensional stability, ensures electrical clearance, and has little impact on other parts (upper plastic 4, top cover 1) during the installation process, making them less prone to deformation. This ensures stable pressure on the sealing ring 5 and reliable sealing.

[0048] This utility model also provides a power battery, which includes a battery cell and a battery casing as described in the above embodiment, with the battery cell installed in an enclosed space.

[0049] It is understood that the battery casing of the power battery of this utility model uses the aforementioned top cover assembly, such that the top cover 1 of the top cover assembly has a terminal post hole 11, the upper electrode block 2 has a through hole 21 communicating with the terminal post hole 11, the second terminal post 3 is installed in the terminal post hole 11, the first post 32 is disposed in the through hole 21 and fits against the upper electrode block 2, the folded edge 31 abuts against the upper electrode block 2, clamping the upper electrode block 2 to the top cover 1, by setting the first post 32 disposed in the through hole 21 and fitting against the upper electrode block 2. The combination of the two makes the contact area between the pole post 3 and the upper electrode block 2 large, the resistance low, and the current carrying capacity enhanced. The folded edge 31 abuts against the upper electrode block 2, which limits the axial direction of the pole post 3 and increases the pushing and pulling force of the pole post 3 relative to the top cover 1. The installation of the pole post 3 is less stressed than the existing riveting technology, is not easy to deform, has high dimensional stability, ensures electrical clearance, and has little impact on other parts (upper plastic 4, top cover 1) during the installation process, making them less prone to deformation. This also makes the pressure of the sealing ring 5 stable and the sealing reliable.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A cap assembly, characterized by, The application relates to a top cover, an upper pole block and a pole column, wherein the top cover is provided with a pole column hole, the upper pole block is provided with a through hole communicated with the pole column hole, the pole column comprises a folded edge, a first column body and a second column body arranged along the axial direction of the pole column hole in sequence, the second column body is arranged in the pole column hole, the first column body is arranged in the through hole and is attached to the upper pole block, the folded edge abuts against the upper pole block and clamps the upper pole block on the top cover. The upper pole block is provided with a groove arranged in the circumferential direction of the through hole, and the folded edge is arranged in the groove.

2. The roof assembly of claim 1, wherein, The upper pole block is provided with a first step at one end close to the through hole in the position of the groove, the outer side of the connection position of the folded edge and the first column body is provided with a second step, and the first step, the second step and the folded edge form a closed space.

3. The roof assembly of claim 2, wherein, The connection position of the first column body and the second column body is provided with a third step, and the third step abuts against one end of the upper pole block far away from the groove.

4. The roof assembly of claim 3, wherein, The plane where the side of the folded edge far away from the first column body is arranged is lower than the plane where the side of the upper pole block far away from the top cover is arranged.

5. The roof assembly of claim 2, wherein, The pole column further comprises a lower pole block, and the side of the second column body far away from the first column body is connected with the lower pole block.

6. The roof assembly of claim 1, wherein, The first column body and the second column body are coaxially arranged, and the cross section of the first column body and the second column body has a long axis and a short axis perpendicular to the axial direction of the pole column hole, and the long axis is parallel to the length direction of the top cover.

7. The roof assembly of any one of claims 1 to 6, wherein, The top cover assembly further comprises an upper plastic and a sealing ring, the upper plastic comprises a first part and a second part connected with the first part, the first part is connected between the upper pole block and the top cover, the second part is connected between the second column body and the top cover, the sealing ring is arranged around the second column body and is clamped between the top cover and the second column body, and the end of the second part facing the sealing ring is provided with a chamfer facing the second column body, and the chamfer is in contact with the sealing ring.

8. The roof assembly of claim 6, wherein, The top cover assembly further comprises a lower plastic, and the lower plastic is connected between the top cover and the lower pole block. The battery shell comprises a shell and the top cover assembly according to any one of claims 1 to 8, and the shell and the top cover assembly form a closed space.

9. A battery housing, characterized by The power battery comprises an electric core and the battery shell according to claim 9, and the electric core is arranged in the closed space.

10. A power cell, characterized by ​

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