Adapter and battery cell

Abstract

The utility model relates to an adapter and a battery monomer. The adapter comprises a tab connecting part, a pole connecting part and a conductive flexible part, the conductive flexible part is connected with the tab connecting part and the pole connecting part, and the conductive flexible part can be telescopically deformed along a preset direction so as to adjust the distance between the tab connecting part and the pole connecting part in the preset direction. According to the utility model, the distance between the tab connecting part and the pole connecting part is adjusted through the conductive flexible part, so that enough space can be provided for welding the pole connecting part and the pole. The single battery provided by the utility model comprises a battery cell, a top cover plate and the adapter. According to the utility model, the battery cell and the top cover plate can be welded with each other in an included angle through the adapter, so that the length of the tab can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a switching component and a battery monomer. Background Art

[0002] Lithium-ion batteries stand out among chemical energy storage devices because of their high energy density, no memory effect, long cycle life, and environmental friendliness. They have attracted widespread attention from industries such as electric vehicles and 3C. At present, the commonly used connecting pieces for square batteries are copper-aluminum hard adapters, and the tabs of the battery cell and the poles on the top cover are welded to the adapters. The height of the tabs is crucial in the design of the battery cell. Tabs that are too long will lead to excessive tab redundancy, inverted tab insertion and cost waste, and tabs that are too short will cause the tabs to tear when bent. Utility Model Content

[0003] To this end, the utility model provides a transition piece and a battery cell, so that the battery cell and the top cover can be welded to each other at an angle, thereby reducing the length of the pole ear.

[0004] In order to solve the above technical problems, the utility model provides a adapter, including a pole lug connection part, a pole post connection part and a conductive flexible part, wherein the conductive flexible part connects the pole lug connection part and the pole post connection part, and the conductive flexible part can be telescopically deformed along a preset direction to adjust the spacing between the pole lug connection part and the pole post connection part in the preset direction.

[0005] Furthermore, the tab connection portion and the pole connection portion are arranged in sequence along a first direction, and two ends of the conductive flexible portion along a preset direction are respectively connected to the tab connection portion and the pole connection portion; the first direction and the preset direction are perpendicular to each other.

[0006] Furthermore, the pole connecting portion includes a first part and a second part, the first part extending along a first direction to have a second part; the pole lug connecting portion is arranged at a gap formed between the first part and the second part; the pole lug connecting portion and the pole connecting portion are connected by a conductive flexible portion, and the first direction and the preset direction are perpendicular to each other.

[0007] Furthermore, the conductive flexible portion is made of rubber material; the conductive flexible portion is integrally connected with the pole lug connecting portion and the pole connecting portion by injection molding.

[0008] Furthermore, a portion of the pole lug connection portion connected to the conductive flexible portion and a portion of the pole connection portion connected to the conductive flexible portion both have rough surfaces.

[0009] Furthermore, the conductive flexible portion, the pole lug connecting portion and the pole connecting portion are connected by riveting or clamping.

[0010] Furthermore, the conductive flexible portion is made of rubber material, and the elastic coefficient of the conductive flexible portion is 5-10N / M.

[0011] Furthermore, in a cross section, an area of ​​the conductive flexible portion accounts for 10%-15% of an area of ​​the adapter, the cross section and the second direction are perpendicular to each other, and the second direction and the first direction are perpendicular to each other.

[0012] The utility model also provides a battery monomer, comprising a battery core, a top cover sheet and the adapter, wherein the preset direction is the width direction of the top cover assembly.

[0013] Furthermore, the battery cell includes a battery cell body and a pole ear extending from the battery cell body, and the extension length of the pole ear is 2mm-9mm.

[0014] Furthermore, a first weld mark is formed after the adapter is welded to the pole ear, and a second weld mark is formed after the adapter is welded to the pole, wherein the pole is arranged on the top cover sheet; in the length direction of the top cover sheet, a distance L between a center line of the second weld mark and a center line of the first weld mark is 50 mm-60 mm.

[0015] The above technical solution of the utility model has the following advantages compared with the prior art:

[0016] 1) The adapter and battery cell of the battery described in the utility model are provided with a pole ear connection part, a pole column connection part and a conductive flexible part, and the relative position of the pole ear connection part and the pole column connection part can be adjusted as needed. After the pole ear is welded, the relative position of the pole ear connection part and the pole column connection part can be adjusted, that is, the relative position of the battery cell and the pole column connection part can be adjusted, thereby avoiding the welding equipment, so that there is enough space for the pole column connection part to be welded with the pole column. The adapter of the utility model enables the battery cell and the top cover to be welded to each other at an angle, thereby reducing the length of the pole ear;

[0017] 2) The battery adapter and battery cell of the utility model are provided with a conductive flexible portion as a conductive rubber portion, which can realize mutual conductivity between the pole ear connection portion and the pole column connection portion on the one hand, and on the other hand, the conductive rubber portion is elastic and can be elastically deformed, thereby making the relative position of the pole ear connection portion and the pole column connection portion adjustable;

[0018] 3) The battery adapter and battery cell of the utility model are manufactured by injection molding, and the conductive rubber part is connected with the pole ear connection part and the pole connection part at the same time, so the production efficiency of the adapter is greatly improved;

[0019] 4) The battery adapter and battery cell of the utility model can ensure a higher connection strength between the tab connection part, the post connection part and the conductive rubber part by providing a rough surface on the tab connection part and the post connection part;

[0020] 5) The adapter and battery cell of the battery described in the utility model set the elastic coefficient of the conductive flexible part to 5-10N / M, so that the adapter is easy to deform and the structure is stable;

[0021] 6) The battery adapter and battery cell of the utility model are configured such that the area of ​​the conductive flexible portion is set to account for 10%-15% of the area of ​​the adapter, and while ensuring that the distance between the tab connection portion and the pole connection portion is adjustable, the tab connection portion and the pole connection portion have sufficient area to connect the tab and the pole;

[0022] 7) The battery adapter and battery cell described in the utility model can adjust the relative position of the pole connection part and the pole ear connection part, so that the bare battery cell and the top cover assembly can be welded at an angle to each other, making the pole ear shorter, achieving the ultimate utilization of the pole ear height and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the adapter in the first embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of the conductive flexible portion of the adapter in the first embodiment of the utility model after being extended along a preset direction;

[0026] Figure 3 It is a schematic diagram of the adapter in the second embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the conductive flexible portion of the adapter in the second embodiment of the utility model after being extended along a preset direction;

[0028] Figure 5 This is a schematic diagram of a battery cell in the first embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the welding tool in the first embodiment of the utility model.

[0030] Explanation of the reference numerals in the drawings in the specification: 1. adapter; 11. pole ear connection portion; 12. pole column connection portion; 13. conductive flexible portion; 21. load-bearing plane; 22. load-bearing inclined plane; 3. top cover sheet; 4. battery cell; 41. pole ear. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0032] See also Figure 1 and Figure 2 As shown, an embodiment of the adapter provided by the utility model.

[0033] Since the adapter 1 is used in a battery, a brief introduction to the battery is given before describing the adapter 1. The battery includes a battery cell, a shell, a top cover assembly, and an electrolyte. The battery cell is mainly divided into two types: a wound battery cell and a laminated battery cell. The wound battery cell is formed by stacking a positive electrode sheet, a negative electrode sheet, and a diaphragm, and then winding. The laminated battery cell is formed by stacking a positive electrode sheet, a negative electrode sheet, and a diaphragm. Both the wound battery cell and the laminated battery cell have a pole ear; the pole ear is arranged on one side of the height direction of the battery cell. The shell is used to accommodate the battery cell and the electrolyte, and the shell is provided with an open opening on one side of the height direction of the battery cell. The top cover assembly is arranged at the open opening, and the top cover assembly includes a top cover sheet, an insulating member, and a pole column. The top cover sheet seals the open opening, and the insulating member is used to insulate the bare battery cell and the top cover sheet. The pole column is arranged on the top cover sheet, and the pole column is connected to the pole ear through the adapter.

[0034] Among them, the current common practice is to first weld the adapter to the tab of the battery cell, then place the two battery cells and the top cover assembly flat on the welding workbench, and set the two battery cells on both sides of the width direction of the top cover sheet; finally, weld the adapter connected to the battery cell and the pole on the top cover assembly. Considering the problem of battery cell flipping, the length of the tab extending from the battery cell is generally designed to be less than 10mm and greater than 15mm.

[0035] According to the above introduction, the inventor thought of placing the battery cell and the top cover assembly at an angle, that is, the top cover assembly is placed flat on the welding workbench and the battery cell is tilted on the welding workbench. Although the above design can reduce the extension length of the pole ear, the tilted setting of the battery cell may cause interference with the welding head.

[0036] To this end, a adapter is introduced below, including a pole lug connection part 11, a pole post connection part 12 and a conductive flexible part 13, wherein the conductive flexible part 13 connects the pole lug connection part 11 and the pole post connection part 12, and the conductive flexible part 13 can be telescopically deformed along a preset direction to adjust the spacing between the pole lug connection part 11 and the pole post connection part 12 in the preset direction.

[0037] In this embodiment, since the conductive flexible portion 13 can be stretched and deformed along a preset direction, the preset direction is configured as the width direction of the top cover sheet 3. Therefore, when the adapter 1 and the pole need to be welded, the distance between the pole ear connection portion 11 and the pole connection portion 12 can be changed along the preset direction (see Figure 2 As shown in the figure), sufficient space is provided for the pole connection part and the pole welding, thereby shortening the length of the pole ear and avoiding interference with the welding head.

[0038] It should be noted that the preset direction is configured as the width direction of the top cover sheet 3 , and of course, it can also be slightly tilted relative to the width direction of the top cover sheet 3 .

[0039] See also Figure 6 As shown, in order to better illustrate the use of the adapter, the welding tool and welding method used during welding are introduced below. The welding tool includes a first jig and a second jig. The distance between the first jig and the second jig shell can be changed along a preset direction. The first jig has a bearing plane 21 for bearing the top cover assembly, and the second jig has a bearing inclined surface 22 for bearing the battery cell. An obtuse angle is formed between the bearing plane 21 and the bearing inclined surface 22. Specifically, the obtuse angle is 105°-145°. For example, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°.

[0040] The welding method comprises the following steps: step 1, setting the top cover assembly on the bearing plane 21 and fixing it on the first fixture, setting the battery cell connected with the adapter on the bearing inclined surface 22 of the second fixture and fixing it on the second fixture; step 2, pre-fixing the pole connecting part 12 of the adapter connected to the battery cell with the pole, and the pre-fixing here can be achieved by a clamp, and the clamp here only needs to achieve the pre-fixing of the pole connecting part 12 with the pole and reserve the position of the second welding mark, and the specific structure will not be repeated; step 3, according to actual use needs, the spacing between the first fixture and the second fixture is changed by the mobile drive mechanism, that is, the conductive flexible part 13 is stretched and deformed along the preset direction, and the mobile drive mechanism here has the possibility of controlling the movement of the first fixture or the second fixture or the relative movement of the first fixture and the second fixture, and the specific structure will not be repeated; step 4, using welding equipment to weld the pole and the pole connecting part 12, and step 5, after the welding is completed, the first fixture and the second fixture are controlled to be reset by the mobile drive mechanism, and the conductive flexible part 13 can also be reset at this time.

[0041] In some embodiments, see Figure 1As shown, the pole connecting portion 12 includes a first part and a second part, the first part extends along the first direction to have the second part; the pole lug connecting portion 11 is arranged at the gap formed between the first part and the second part; the pole lug connecting portion 11 and the pole connecting portion 12 are connected by a conductive flexible portion 13, and the first direction and the preset direction are perpendicular to each other.

[0042] In some embodiments, the conductive flexible portion 13 is made of rubber material; the conductive flexible portion 13 is integrally connected with the pole lug connection portion 11 and the pole connection portion 12 by injection molding.

[0043] Among them, the rubber material needs to have two properties: conductivity and rubber. By adding conductive fillers to rubber, it can be made conductive. The principle is mainly based on two aspects: rubber matrix and conductive fillers. The rubber matrix has good elasticity and softness; conductive fillers are the key to the conductive properties of conductive rubber. Commonly used conductive fillers mainly include metal fillers and carbon black fillers. Metal fillers mainly include copper powder, aluminum powder, etc., which have good conductive properties. Carbon black is a carbon filler that has conductive and antistatic properties. Conductive fillers can form a conductive path by adding them to the rubber matrix, so that the conductive rubber has conductive properties.

[0044] In this embodiment, the conductive flexible portion 13 is made of rubber material, which can achieve mutual conductivity between the pole lug connection portion 11 and the pole post connection portion 12 on the one hand, and has good elasticity on the other hand, so that the relative position of the pole lug connection portion 11 and the pole post connection portion 12 can be adjusted.

[0045] In addition, in this embodiment, in order to quickly connect the pole lug connection part 11 and the pole post connection part 12, the pole lug connection part 11 and the pole post connection part 12 can be connected by injection molding. Specifically, the pole lug connection part 11 and the pole post connection part 12 are respectively arranged in the cavity of the mold, and then the rubber material is injected into the cavity of the mold. After the rubber material solidifies, the conductive flexible part 13 can be formed while the connection between the pole lug connection part 11 and the pole post connection part 12 is realized.

[0046] Furthermore, in order to ensure that the conductive flexible portion 13 is firmly connected to the pole lug connection portion 11 and the pole post connection portion 12 when the pole lug connection portion 11 and the pole post connection portion 12 are connected by injection molding, the portion of the pole lug connection portion 11 connected to the conductive flexible portion 13 and the portion of the pole post connection portion 12 connected to the conductive flexible portion 13 are both designed to have rough surfaces.

[0047] In other embodiments, the conductive flexible portion 13 and the tab connection portion and the pole connection portion may be connected by riveting or clamping. For example, the edge of the conductive flexible portion 13 and the edge of the tab connection portion are first stacked and then anchored with rivets.

[0048] The preferred implementation method in this embodiment is to solve the problem that when the conductive flexible part is not easy to deform, changing the distance between the pole ear connecting part 11 and the pole connecting part 12 may tear the pole ear, and also to solve the problem that the adapter structure is unstable when the conductive flexible part is easy to deform. The conductive flexible part 13 is made of rubber material, and the elastic coefficient of the conductive flexible part 13 is 5-10N / M. For example, the elastic coefficient of the conductive flexible part 13 is 5N / M, 6N / M, 7N / M, 8N / M, 9N / M or 10N / M.

[0049] In this embodiment, the elastic coefficient of the conductive flexible portion 13 is designed to be 5-10 N / M, so that the overall structure of the adapter 1 is stable and the tab will not be torn when deformed.

[0050] In the preferred implementation mode of this embodiment, in the cross section, the area of ​​the above-mentioned conductive flexible part 13 occupies 10%-15% of the area of ​​the adapter, the cross section and the second direction are perpendicular to each other, and the second direction and the first direction are perpendicular to each other, where the second direction is the thickness direction of the top cover sheet 3.

[0051] In this embodiment, the proportion of the conductive flexible portion 13 should neither be too large nor too small. If it is too large, the tab connection portion 11 and the pole connection portion 12 will be small and difficult to connect with the tab and the pole. If it is too small, the conductive flexible portion 13 will not be easily deformed. Therefore, the proportion of the conductive flexible portion 13 should be set within a suitable range to ensure that the distance between the tab connection portion 11 and the pole connection portion 12 is adjustable while ensuring that the tab connection portion 11 and the pole connection portion 12 have enough area to connect with the tab and the pole. Specifically, in the cross section, the area of ​​the conductive flexible portion 13 accounts for 10%, 11%, 12%, 13%, 14% or 15% of the area of ​​the adapter.

[0052] See also Figure 5 As shown, a battery cell of this embodiment includes a battery cell 4, a top cover sheet 3 and the adapter 1 described above, and the preset direction is the width direction of the top cover sheet 3. The battery cell 4 includes a battery cell body and a pole ear 41 extending from the battery cell body, and the extension length of the pole ear 41 is 2mm-9mm. In this embodiment, compared with the extension length of the existing pole ear, the extension length of the pole ear 41 is shortened, and the specific extension length of the pole ear 41 can be 2mm or 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm.

[0053] In the preferred implementation of this embodiment, the adapter 1 is welded to the pole lug 41 to form a first weld mark, wherein the size of the first weld mark is 6mm*20mm; the adapter 1 is welded to the pole to form a second weld mark, wherein the pole is arranged on the top cover sheet 3; in the length direction of the top cover sheet 3, the distance L between the center line of the second weld mark and the center line of the first weld mark is 50mm-60mm, specifically, L can be 52mm or 54mm or 56mm or 57mm or 59mm. In this embodiment, the distance between the second weld mark and the first weld mark is designed to be 50mm-60mm, which can achieve high flow efficiency. Embodiment 2

[0054] The basic structure of a switching element and a battery cell of this embodiment is the same as that of the first embodiment, except that: Figure 3 and Figure 4 As shown, the tab connection portion 11 and the pole connection portion 12 are arranged in sequence along a first direction, and the two ends of the conductive flexible portion 13 along a preset direction are respectively connected to the tab connection portion 11 and the pole connection portion 12; the first direction and the preset direction are perpendicular to each other.

[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A transfer component, characterized in that: The invention comprises a pole lug connection portion (11), a pole column connection portion (12) and a conductive flexible portion (13), wherein the conductive flexible portion (13) connects the pole lug connection portion (11) and the pole column connection portion (12), and the conductive flexible portion (13) can be extended and deformed along a preset direction to adjust the distance between the pole lug connection portion (11) and the pole column connection portion (12) in the preset direction.

2. The adapter according to claim 1, characterized in that: The pole lug connection portion (11) and the pole column connection portion (12) are arranged in sequence along a first direction, and the two ends of the conductive flexible portion (13) along a preset direction are respectively connected to the pole lug connection portion (11) and the pole column connection portion (12); the first direction and the preset direction are perpendicular to each other.

3. The adapter according to claim 1, characterized in that: The pole connecting portion (12) comprises a first portion and a second portion, the first portion extending along a first direction to form the second portion; the pole lug connecting portion (11) is arranged at a gap formed between the first portion and the second portion; the pole lug connecting portion (11) and the pole connecting portion (12) are connected via a conductive flexible portion (13), and the first direction and the preset direction are perpendicular to each other.

4. The adapter according to any one of claims 1 to 3, characterized in that: The conductive flexible portion (13) is made of rubber material; the conductive flexible portion (13) is integrally connected with the pole lug connection portion (11) and the pole column connection portion (12) by injection molding.

5. The adapter according to claim 4, characterized in that: The portion of the pole lug connection portion (11) connected to the conductive flexible portion (13) and the portion of the pole connection portion (12) connected to the conductive flexible portion (13) both have rough surfaces.

6. The adapter according to claim 1, characterized in that: The conductive flexible portion (13) is made of rubber material, and the elastic coefficient of the conductive flexible portion (13) is 5-10 N / M.

7. The adapter according to claim 2, characterized in that: In a cross section, the area of ​​the conductive flexible portion (13) accounts for 10%-15% of the area of ​​the adapter, the cross section and the second direction are perpendicular to each other, and the second direction and the first direction are perpendicular to each other.

8. A battery cell, characterized in that: It comprises a battery cell, a top cover sheet (3), and an adapter (1) according to any one of claims 1 to 7, wherein the preset direction is the width direction of the top cover sheet (3).

9. The battery cell according to claim 8, characterized in that: The battery cell (4) comprises a battery cell body and a pole ear (41) extending from the battery cell body, and the extension length of the pole ear (41) is 2 mm-9 mm.

10. The battery cell according to claim 8, characterized in that: The adapter (1) is welded to the pole lug (41) to form a first weld mark, and the adapter (1) is welded to the pole to form a second weld mark, wherein the pole is arranged on the top cover sheet (3); in a first direction, a distance L between a center line of the second weld mark and a center line of the first weld mark is 50 mm-60 mm, and the first direction is the length direction of the top cover sheet (3).

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