Composite pole, cover plate structure and battery cell

Abstract

The utility model relates to energy storage equipment technical field especially relates to a kind of composite pole, cover plate structure and electric core, composite pole includes coaxially arranged aluminium part and copper part, copper part has the first through-hole being opened along the through hole of its own axial direction, the insertion part of aluminium part is inserted in the first through-hole, and the insertion part is interference fit with the inner wall of the first through-hole, composite pole is obtained by friction welding process from coaxial aluminium bar and copper pipe.Processing.Cover plate structure includes top cover and the composite pole described above, and top cover is provided with first assembly hole, and composite pole is inserted at first assembly hole.Electric core includes shell and the cover plate structure described above, and cover plate structure cover is set at the opening of shell.The composite pole, cover plate structure and electric core can help to reduce the amount of copper material, reduce the weight of cover plate structure, reduce the risk of composite pole copper-aluminum composite surface falling off, improve the quality of electric core.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a composite pole, cover plate structure and battery cell. Background Technology

[0002] Composite terminals are made of both copper and aluminum. Compared to pure aluminum terminals, composite terminals have significant advantages in core dimensions such as conductivity, mechanical properties, corrosion resistance, and compatibility. Current technology uses friction welding to process composite terminals. The raw materials for composite terminals, especially copper, are used in large quantities and are expensive. Furthermore, copper has a higher density, leading to increased weight. Moreover, the copper-aluminum composite surface still has a significant risk of detachment under certain conditions, which is detrimental to ensuring cell quality. Utility Model Content

[0003] One objective of this invention is to provide a composite electrode post that can reduce the amount of copper used, lighten the weight of the cover plate structure, and reduce the risk of copper-aluminum composite surface falling off, thereby improving the quality of the battery cell.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A composite electrode post is provided, comprising an aluminum part and a copper part arranged coaxially. The copper part has a first through hole extending along its own axial direction. An insertion part of the aluminum part is inserted into the first through hole, and the insertion part is interference-fitted with the inner wall of the first through hole. The composite electrode post is obtained by friction welding of a coaxial aluminum rod and a copper tube.

[0006] Optionally, the aluminum part includes a main body, which is connected to the insertion part, and the end face of the insertion part away from the main body is flush with the end face of the copper part away from the main body.

[0007] Optionally, the copper part has an annular boss protruding in a direction away from the main body, and the end face of the annular boss away from the main body is flush with the end face of the insertion part away from the main body.

[0008] Optionally, the aluminum part includes a main body part connected to the insertion part. The main body part has an annular end face facing the copper part, and the annular end face is connected to the copper part by a friction welding process.

[0009] Another objective of this invention is to provide a cover plate structure that can reduce weight and decrease the risk of the composite electrode copper-aluminum composite surface falling off, thereby improving the quality of the battery cell.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] A cover plate structure is provided, including a top cover and the aforementioned composite pole, wherein the top cover has a first mounting hole and the composite pole is inserted into the first mounting hole.

[0012] Optionally, it also includes a first connector, the first connector and the copper part are both located on the side of the top cover facing the inside of the cell, the first connector has a first plate with a limiting hole, and the copper part has an annular boss protruding towards the inside of the cell, the annular boss being inserted into the limiting hole.

[0013] Optionally, the annular boss is welded to the first plate.

[0014] Optionally, the copper portion has an annular surface surrounding the annular boss and facing inwards towards the inside of the battery cell, and the annular surface is attached to the end face of the first plate facing outwards from the battery cell.

[0015] Optionally, it also includes a protective film, which is attached to the end face of the first plate facing the inside of the cell, and the protective film covers the composite electrode post.

[0016] Another objective of this invention is to provide a battery cell that can reduce the weight of the cover plate structure, reduce the risk of the composite electrode copper-aluminum composite surface falling off, thereby improving the quality of the battery cell.

[0017] To achieve this objective, the present invention adopts the following technical solution:

[0018] A battery cell is provided, including a housing and the aforementioned cover structure, the cover structure covering an opening in the housing.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a composite electrode post, comprising an aluminum portion and a copper portion coaxially arranged. The copper portion has a first through hole extending along its own axial direction. An insertion portion of the aluminum portion is inserted into the first through hole, with an interference fit between the insertion portion and the inner wall of the first through hole. The composite electrode post is manufactured by friction welding of coaxial aluminum rods and copper tubes. Compared to using solid copper rods, this composite electrode post uses hollow copper tubes as raw materials, which reduces the amount of copper used, lowers costs, and reduces the weight of the cover plate structure. Furthermore, the interference fit between the insertion portion of the aluminum portion and the inner wall of the first through hole in the copper portion further enhances the bonding strength between the aluminum and copper portions, thereby improving the quality of the battery cell.

[0021] This utility model also provides a cover plate structure, including a top cover and the aforementioned composite electrode post. The top cover has a first mounting hole, and the composite electrode post is inserted into the first mounting hole. This cover plate structure can reduce weight and decrease the risk of the copper-aluminum composite surface of the composite electrode post falling off, thereby improving the quality of the battery cell.

[0022] This utility model also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure being disposed over the opening of the housing. This battery cell can reduce the weight of the cover structure and decrease the risk of the copper-aluminum composite surface of the composite electrode detaching, thereby improving the quality of the battery cell. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the composite pole provided in an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the composite pole provided in this embodiment of the utility model;

[0025] Figure 3 This is a structural schematic diagram of the processing of the composite pole provided in this embodiment of the utility model;

[0026] Figure 4 This is a structural cross-sectional view of the composite pole provided in this embodiment of the present invention during the processing.

[0027] Figure 5 This is a first-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0028] Figure 6 This is a second-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0029] Figure 7 This is an exploded view of the cover plate structure provided in this embodiment of the utility model;

[0030] Figure 8 This is a partially enlarged cross-sectional view of the cover plate structure provided in this embodiment of the utility model.

[0031] In the picture:

[0032] 1. Composite pole; 11. Aluminum part; 111. Insertion part; 112. Main body part; 1121. Annular end face; 12. Copper part; 121. Annular boss; 122. Annular surface; 101. Aluminum rod; 1011. Edge overflow; 1012. Center overflow; 102. Copper tube;

[0033] 2. Top cover; 21. First assembly hole;

[0034] 3. First connecting piece; 31. First plate; 311. Limiting hole; 32. Second plate;

[0035] 4. Protective film; 5. Positive electrode post; 6. Second connector; 7. Upper plastic; 8. Lower plastic; 9. Sealing ring; 10. Explosion-proof valve. Detailed Implementation

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] like Figures 1-8 As shown, the composite pole 1 of this embodiment includes an aluminum part 11 and a copper part 12 arranged coaxially. The copper part 12 has a first through hole that extends through it along its own axial direction. The insertion part 111 of the aluminum part 11 is inserted into the first through hole. The insertion part 111 is interference-fitted with the inner wall of the first through hole. The composite pole 1 is obtained by friction welding of a coaxial aluminum rod 101 and a copper tube 102.

[0040] Compared to using solid copper rods, this composite electrode post 1 uses hollow copper tubes 102 as raw materials, which can reduce the amount of copper used, lower costs, and reduce the weight of the cover plate structure. Moreover, the composite electrode post 1, through the interference fit between the insertion portion 111 of the aluminum part 11 and the inner wall of the first through hole on the copper part 12, can further improve the bonding strength between the aluminum part 11 and the copper part 12, thereby improving the quality of the battery cell.

[0041] An aluminum rod 101 and a copper tube 102 are coaxially arranged, with one end of the aluminum rod 101 friction-welded to one end of the copper tube 102. This means they move relative to each other, and their contact surfaces are subjected to force, causing the aluminum rod 101 to deform and form a shape similar to... Figures 3-4In the structure shown, deformation of the aluminum rod 101 will create an edge overflow 1011 on the outer side of the contact surface, and part of the material from the aluminum rod 101 will enter the hollow cavity of the copper tube 102, forming a central overflow 1012. This intermediate structure can then be CNC machined to obtain... Figures 1-2 The composite pole 1 shown. The overflow material 1012 in the middle will form the insertion part 111 of the aluminum part 11 after processing, which is interference fit with the first through hole of the copper part 12, further strengthening the bonding force between the aluminum part 11 and the copper part 12.

[0042] like Figures 1-2 As shown, optionally, the aluminum part 11 includes a main body 112, which is connected to the insertion part 111. The end face of the insertion part 111 away from the main body 112 is flush with the end face of the copper part 12 away from the main body 112. One end of the insertion part 111 is located inside the battery cell, and the flush end face is beneficial for the arrangement inside the battery cell.

[0043] Optionally, the copper portion 12 has an annular boss 121 protruding in a direction away from the main body portion 112. The end face of the annular boss 121 away from the main body portion 112 is flush with the end face of the insertion portion 111 away from the main body portion 112. The annular boss 121 and the insertion portion 111 together form a columnar protrusion, which facilitates the assembly of the composite electrode post 1 with the components inside the battery cell.

[0044] Optionally, the main body 112 of the aluminum part 11 has an annular end face 1121, which faces the copper part 12. The annular end face 1121 is connected to the copper part 12 by friction welding. That is, along the radial direction of the composite pole 1, the size of the main body 112 is larger than the size of the insertion part 111, so that the main body 112 has an end face, i.e., an annular end face 1121, that is, to engage with the copper part 12. This helps to ensure that the bonding force between the aluminum part 11 and the copper part 12 is sufficiently large.

[0045] like Figures 6-8 As shown, this embodiment also provides a cover plate structure, including a top cover 2 and the aforementioned composite electrode post 1. The top cover 2 has a first mounting hole 21, and the composite electrode post 1 is inserted into the first mounting hole 21. This cover plate structure can reduce weight and lower the risk of the copper-aluminum composite surface of the composite electrode post 1 falling off, thereby improving the cell quality.

[0046] Optionally, the cover structure further includes a first connector 3, which is used to connect the composite pole 1 to the electrode tab of the electrode group. The first connector 3 and the copper part 12 are both located on the side of the top cover 2 facing the inside of the cell. The first connector 3 has a first plate 31 with a limiting hole 311. The copper part 12 has an annular boss 121 protruding towards the inside of the cell. The annular boss 121 is inserted into the limiting hole 311 to ensure that the relative position of the first connector 3 and the composite pole 1 is fixed.

[0047] Optionally, the annular boss 121 is welded to the first plate 31. That is, the edge of the end face of the annular boss 121 is welded to the area surrounding the limiting hole 311 of the first plate 31. Optionally, the first connector 3 is also made of copper to ensure a firm weld with the annular boss 121 of the copper part 12. Optionally, the annular boss 121 is laser welded to the first plate 31.

[0048] Optionally, the copper part 12 has an annular surface 122, which is arranged around the annular boss 121 and faces the inside of the cell. The annular surface 122 is attached to the end face of the first plate 31 facing the outside of the cell. The annular surface 122 can support the first plate 31, and the attachment of the two is conducive to the conduction of electricity.

[0049] Optionally, the first connector 3 also includes a second plate 32. The surface of the first plate 31 is parallel to the top cover 2, and the second plate 32 is perpendicular to the first plate 31. The second plate 32 can also be configured as a bent structure, which is not limited here. The second plate 32 is used to connect with the electrode tabs of the electrode assembly.

[0050] To prevent corrosion of the end face of the insertion portion 111 of the aluminum part 11 from contacting the electrolyte, the cover structure may optionally include a protective film 4. The protective film 4 is attached to the end face of the first plate 31 facing the inside of the cell. The protective film 4 covers the composite electrode 1, thus isolating the composite electrode 1 from the electrolyte and preventing corrosion. Moreover, the protective film 4 is made of insulating material, which can also prevent short circuits.

[0051] Optionally, in this embodiment, the composite electrode 1 is disposed at the negative electrode, and correspondingly, the first connector 3 is located at the negative electrode. The cover plate structure also includes a positive electrode 5, which is inserted into the second mounting hole of the top cover 2.

[0052] Optionally, the cover plate structure further includes a second connector 6, which is used to connect the positive terminal 5 to the unit's tab. The structure of the second connector 6 is similar to that of the first connector 3, and will not be described in detail here.

[0053] Optionally, the positive terminal 5 is made of aluminum, and the second connector 6 is also made of aluminum. Optionally, the positive terminal 5 and the second connector 6 are welded together.

[0054] Optionally, the cover structure also includes a lower plastic 8, which is attached to the side of the top cover 2 facing the inside of the battery cell. The lower plastic 8 is partially sandwiched between the first plate 31 of the first connector 3 and the top cover 2, and partially sandwiched between the second connector 6 and the top cover 2, so as to ensure that the top cover 2 is insulated from both the positive and negative electrodes.

[0055] Optionally, the cover structure also includes two fixing blocks, both of which are located on the side of the top cover 2 facing the outside of the battery cell. One fixing block is used to connect with the aluminum part 11 of the composite electrode post 1, and the other fixing block is used to connect with the positive electrode post 5. Optionally, the connection method can be riveting, welding, or other methods.

[0056] Optionally, the cover structure also includes two upper plastic plates 7, located at the positive and negative electrodes respectively. One upper plastic plate 7 is partially sandwiched between the fixing block of the negative electrode and the top cover 2, and the upper plastic plate 7 has sides to wrap around the sidewall of the fixing block, ensuring that the fixing block, the composite electrode post 1, and the top cover 2 are insulated from each other. The other upper plastic plate 7 is partially sandwiched between the fixing block of the positive electrode and the top cover 2, and this upper plastic plate 7 also has sides to wrap around the sidewall of the fixing block, ensuring that the fixing block, the positive electrode post 5, and the top cover 2 are insulated from each other.

[0057] Optionally, the cover structure also includes two sealing rings 9. One sealing ring 9 is fitted onto the main body 112 of the composite electrode post 1. This sealing ring 9 is located inside the first mounting hole 21 of the top cover 2. One end of the sealing ring 9 abuts against the upper plastic 7, and the other end abuts against the copper part 12. The outer wall of the sealing ring 9 abuts against the inner wall of the first mounting hole 21 of the top cover 2 to ensure insulation and sealing at this location. The other sealing ring 9 is fitted onto the positive electrode post 5. This sealing ring 9 is located inside the second mounting hole of the top cover 2. One end of the sealing ring 9 abuts against the upper plastic 7, and the other end abuts against the bottom plate of the positive electrode post 5. The outer wall of the sealing ring 9 abuts against the inner wall of the second mounting hole of the top cover 2 to ensure insulation and sealing at this location.

[0058] Optionally, the cover structure also includes an explosion-proof valve 10, which is located at the explosion-proof through hole of the top cover 2 to ensure the safety of the battery cell.

[0059] This embodiment also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure being disposed at the opening of the housing. This battery cell can reduce the use of copper, lower costs, and reduce the weight of the cover structure. Moreover, by using a copper tube 102 to process the composite electrode post 1, aluminum material can be pressed into the hollow cavity during friction welding, so that the insertion part 111 expands and fixes the copper part 12. In extreme cases, such as in the event of failure of copper-aluminum friction welding, the above structure can reduce the risk of copper material falling off, i.e., the composite electrode post 1 breaking, and help maintain the copper-aluminum bonding force of the composite electrode post 1, thereby improving the quality of the battery cell.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A composite electrode, characterized in that, The composite pole (1) includes an aluminum part (11) and a copper part (12) arranged coaxially. The copper part (12) has a first through hole that extends along its own axial direction. The insertion part (111) of the aluminum part (11) is inserted into the first through hole. The insertion part (111) is interference-fitted with the inner wall of the first through hole. The composite pole (1) is obtained by friction welding of a coaxial aluminum rod (101) and a copper tube (102).

2. The composite electrode according to claim 1, characterized in that, The aluminum part (11) includes a main body part (112), which is connected to the insertion part (111). The end face of the insertion part (111) away from the main body part (112) is flush with the end face of the copper part (12) away from the main body part (112).

3. The composite electrode according to claim 2, characterized in that, The copper part (12) has an annular boss (121) protruding in a direction away from the main body part (112), and the end face of the annular boss (121) away from the main body part (112) is flush with the end face of the insertion part (111) away from the main body part (112).

4. The composite electrode according to any one of claims 1-3, characterized in that, The aluminum part (11) includes a main body (112), which is connected to the insertion part (111). The main body (112) has an annular end face (1121) which faces the copper part (12). The annular end face (1121) is connected to the copper part (12) by friction welding.

5. A cover plate structure, characterized in that, Includes a top cover (2) and a composite pole as described in any one of claims 1-4, wherein the top cover (2) has a first mounting hole (21) and the composite pole (1) is inserted into the first mounting hole (21).

6. The cover plate structure according to claim 5, characterized in that, It also includes a first connector (3), the first connector (3) and the copper part (12) are both located on the side of the top cover (2) facing the inside of the cell. The first connector (3) has a first plate (31) with a limiting hole (311) on the first plate (31). The copper part (12) has an annular boss (121) protruding towards the inside of the cell, and the annular boss (121) is inserted into the limiting hole (311).

7. The cover plate structure according to claim 6, characterized in that, The annular boss (121) is welded to the first plate (31).

8. The cover plate structure according to claim 6, characterized in that, The copper part (12) has an annular surface (122) which surrounds the annular boss (121) and faces the inside of the cell. The annular surface (122) is attached to the end face of the first plate (31) facing the outside of the cell.

9. The cover plate structure according to claim 6, characterized in that, It also includes a protective film (4), which is attached to the end face of the first plate (31) facing the inside of the cell and covers the composite pole (1).

10. A battery cell, characterized in that, It includes a housing and a cover structure as described in any one of claims 5-9, the cover structure covering the opening of the housing.

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