Battery cell top cover

Abstract

The utility model relates to a battery cell top cover, which can improve the overall stability of the battery cell top cover by fixedly arranging a pole assembly in a top cover assembly. The accommodating groove communicated with the mounting guide hole is formed in the pole assembly, so that the material consumption of the pole assembly is successfully reduced, the weight of the pole assembly is reduced, the tab of the external battery cell can penetrate through the mounting guide hole and then enter the first accommodating cavity, and an accommodating space can be provided for the tab of the external battery cell. Through the arrangement, on the premise of realizing correct connection between the external battery cell and the battery cell top cover, the internal occupied space of the battery cell is also reduced, so that the lightweight design of the battery cell is better realized.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell top cover. Background Technology

[0002] The new energy market is becoming increasingly competitive, and companies need to continuously optimize cell structures to improve the competitiveness of their battery cells. The top cover, as a crucial component of the cell, has a structure and manufacturing process that determines its cost and also affects its capacity. Many cells on the market use copper-aluminum adapter plates as a carrier to connect the bare cell and the top cover, resulting in high manufacturing costs. Furthermore, the terminal post structures on the market are relatively thick, increasing the cost of the top cover and occupying internal space within the cell, severely impacting the lightweight design of the battery. Utility Model Content

[0003] Therefore, it is necessary to provide a cell top cover to solve the technical problems existing in the background technology.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A battery cell top cover includes: a top cover assembly, on which terminal post assemblies are spaced apart, the terminal post assemblies are fixedly connected to the top cover assembly, the terminal post assemblies have a receiving groove inside, and the top cover assembly has an installation guide hole communicating with the receiving groove.

[0006] In one embodiment, the top cover assembly includes: a cover plate and an insulating base connected to each other, the cover plate having a mounting through hole, the pole assembly passing through the mounting through hole, the pole assembly being disposed between the cover plate and the insulating base, and the mounting guide hole being formed in the insulating base.

[0007] In one embodiment, the pole assembly includes an upper pole pressing member and a lower pole pressing member. A limiting groove is formed on the insulating base. The lower pole pressing member passes through the mounting guide hole and abuts against the side wall of the limiting groove. The upper pole pressing member passes through the mounting through hole and is fixedly connected to the lower pole pressing member. The receiving groove is formed in the lower pole pressing member.

[0008] In one embodiment, the pole assembly further includes a seal, which is sleeved on the outer surface of the pole pressing member and the outer surface of the seal abuts against the side wall of the limiting groove.

[0009] In one embodiment, a limiting part is provided on each side of the pole pressing member, and the outer surfaces of the two limiting parts abut against the side wall of the limiting groove, respectively.

[0010] In one embodiment, the sealing element is sleeved on the outer surface of the pole post pressing element, the sealing element is located between the limiting part and the limiting groove, the first surface of the sealing element is connected to the surface of the limiting part, and the second surface of the sealing element abuts against the side wall of the limiting groove.

[0011] In one embodiment, the pole assembly further includes an insulating member, which is sleeved on the outer surface of the pressure member on the pole and at least partially enters the mounting through hole.

[0012] In one embodiment, the upper pressure member of the pole post has a slot at one end near the insulating base, and the lower pressure member of the pole post is inserted into the slot at one end near the cover plate.

[0013] In one embodiment, the end of the upper electrode pressure member away from the insulating base is provided with a welding groove for fixing the upper electrode pressure member and the lower electrode pressure member together.

[0014] In one embodiment, the pole assembly further includes a pressure ring, wherein the pole lower pressure member passes through the mounting guide hole and the mounting through hole in sequence, and the pressure ring passes through the mounting through hole and is sleeved on the outer surface of the pole lower pressure member and then fixedly connected to the pole lower pressure member.

[0015] The beneficial effects of this invention are as follows: By fixing the terminal assembly inside the top cover assembly, the overall stability of the battery cell top cover is improved. The presence of a receiving groove communicating with the mounting guide hole within the terminal assembly successfully reduces the amount of material used in the terminal assembly, thus lightening its weight. Furthermore, the tabs of the external battery cell can pass through the mounting guide hole and enter the first receiving cavity, providing space for the tabs of the external battery cell. Through the above design, while ensuring a correct connection between the external battery cell and the battery cell top cover, the internal space occupied by the battery cell is also reduced, thereby achieving a better lightweight design for the battery cell. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the top cover of the battery cell in Example 1;

[0018] Figure 2 This is a three-dimensional exploded view of the top cover of the battery cell in Example 1;

[0019] Figure 3 This is a schematic cross-sectional view of the upper pressure component of the positive electrode post, the lower pressure component of the positive electrode post, and the top cover assembly in Example 1.

[0020] Figure 4 This is a cross-sectional structural diagram of the explosion-proof component and the top cover component of Example 1;

[0021] Figure 5 This is a schematic cross-sectional view of the upper negative electrode post, the lower negative electrode post, and the top cover assembly in Example 1.

[0022] Figure 6 This is a three-dimensional exploded view of the top cover of the battery cell in Example 2;

[0023] Figure 7 This is a cross-sectional structural diagram of the pressure ring, the lower pressure member of the positive electrode post, and the top cover assembly in Example 2;

[0024] Figure 8 This is a schematic cross-sectional view of the pressure ring, negative electrode post lower pressure component, and top cover assembly in Example 2.

[0025] Figure 9 This is a cross-sectional structural diagram of the battery cell and its top cover in Example 1.

[0026] In the attached diagram, 10 is the electrode assembly; 11 is the upper electrode pressing component; 110 is the welding groove; 111 is the slot; 112 is the upper negative electrode pressing component; 113 is the upper positive electrode pressing component; 12 is the lower electrode pressing component; 120 is the receiving groove; 121 is the limiting part; 122 is the lower negative electrode pressing component; 123 is the lower positive electrode pressing component; 13 is the sealing component; 14 is the insulating component; 140 is the mounting groove; 15 is the pressure ring; 150 is the mounting hole; 20 is the top cover assembly; 21 is the cover plate; 210 is the mounting through hole; 211 is the mounting cavity; 22 is the insulating base; 220 is the mounting guide hole; 221 is the limiting groove; 222 is the shielding hole; 30 is the explosion-proof component; 31 is the explosion-proof valve; 32 is the protective film; 40 is the battery cell; and 41 is the electrode tab. Detailed Implementation

[0027] Example 1

[0028] Battery cell top cover, such as Figures 1 to 5 , Figure 9As shown, the battery includes: a top cover assembly 20, on which terminal post assemblies 10 are spaced apart, the terminal post assemblies 10 are fixedly connected to the top cover assembly 20, and a receiving groove 120 is formed inside the terminal post assembly 10. The top cover assembly 20 has a mounting guide hole 220 communicating with the receiving groove 120. There are two terminal post assemblies 10, namely a positive terminal post assembly 10 and a negative terminal post assembly 10, which differ in name and material. The receiving groove 120 is used to accommodate the tabs 41 of the battery cell 40. The battery cell 40 is the external structure outside the top cover of the cell 40. Both the positive and negative electrode post assemblies 10 have receiving slots 120. The two receiving slots 120 serve the same purpose: the tabs 41 of the battery cell 40 are the positive and negative tabs, respectively. In use, the positive and negative tabs of the battery cell 40 pass through two mounting guide holes 220 and enter their corresponding receiving slots 120. For example, the positive tab enters the receiving slot 120 of the positive electrode post assembly 10, and the negative tab enters the receiving slot 120 of the negative electrode post assembly 10. After entering the receiving slots 120, the tabs 41 of the battery cell 40 are gathered within the first receiving cavity and abut against the side wall of the receiving slot 120. Preferably, laser welding is used to weld the tabs 41 of the battery cell 40 into the receiving slots 120. By providing receiving slots 120, the electrode post assembly 10 not only reduces material usage and overall weight but also provides integrated placement space for the tabs 41 of the battery cell 40. This not only reduces the space occupied inside the battery, but also further achieves battery weight reduction.

[0029] Specifically, such as Figure 2 , Figure 3As shown in Figure 5, the top cover assembly 20 includes a cover plate 21 and an insulating base 22 connected to each other. The cover plate 21 is located above the insulating base 22, and the cover plate 21 and the insulating base 22 are detachably connected. The pole assembly 10 includes an upper pole pressing member 11 and a lower pole pressing member 12. The cover plate 21 has two spaced-apart mounting through holes 210, and the insulating base 22 has mounting guide holes 220 corresponding to the two mounting through holes 210. The insulating base 22 also has two limiting grooves 221. It should be noted that, for ease of description regarding the assembly of the pole assembly 10 and the top cover assembly 20, the end of the lower pole pressing member 12 closest to the insulating base 22 is defined as the first end of the lower pole pressing member 12, and the end of the lower pole pressing member 12 furthest from the insulating base 22 is defined as the second end. The end of the upper pressure member 11 near the insulating base 22 is defined as the first end of the upper pressure member 11, and the end of the upper pressure member 11 away from the insulating base 22 is defined as the second end of the upper pressure member 11. During assembly, firstly, the cover plate 21 and the insulating base 22 are aligned and connected. Then, the second end of the lower pressure member 12 passes through the mounting guide hole 220, and the surface of the first end of the lower pressure member 12 abuts against the bottom wall of the limiting groove 221. The limiting groove 221 restricts the position of the lower pressure member 12, ensuring the correct installation position. Then, the first end of the upper pressure member 11 passes through the mounting through hole 210 and connects to the second end of the lower pressure member 12. The second end of the second pole mounting member abuts against the surface of the cover plate 21. Finally, a through-welding method is preferred to weld the first end of the upper electrode pressure member 11 and the second end of the lower electrode pressure member 12 into a single unit, so that the upper electrode pressure member 11 and the lower electrode pressure member 12 clamp the insulating base 22 and the cover plate 21, thereby forming a stable whole between the electrode assembly 10 and the top cover assembly 20. It should be noted that since there are two electrode assemblies 10, the assembly method and steps between the two electrode assemblies 10 and the top cover assembly 20 are the same as described above. The receiving groove 120 is formed in the lower electrode pressure member 12, and the receiving groove 120 penetrates through the first and second ends of the electrode. Since the battery cell 40 is mostly located below the top cover of the battery cell 40, forming the receiving groove 120 on the lower electrode pressure member 12 facilitates the assembly between the battery cell 40 and the top cover of the battery cell 40.

[0030] It should be noted that the cover plate 21 is made of aluminum alloy or other lightweight and corrosion-resistant materials, and the insulating base 22 is made of polyphenylene sulfide, which is corrosion-resistant and insulating. Therefore, using this material as the insulating base 22 can meet the usage requirements of the top cover of the battery cell 40. The upper pressing parts 11 on the two pole columns need to be distinguished in terms of material. Among them, the materials of the upper pressing part 113 of the positive pole column and the lower pressing part 123 of the positive pole column are both aluminum. Aluminum is light in weight and excellent in electrical conductivity. The materials of the upper pressing part 112 of the negative pole column and the lower pressing part 122 of the negative pole column are copper-aluminum alloy. The outer surface of the lower pressing part 12 of the pole column is aluminum, and a copper layer is provided on the side wall of the accommodating groove 120, so as to facilitate welding the tab 41 of the battery cell 40 to the side wall of the accommodating groove 120.

[0031] Preferably, as Figure 3 and Figure 5 shown, the width of the limiting groove 221 is the same as that of the first end of the lower pressing part 12 of the pole column, so that when the lower pressing part 12 of the pole column is assembled, the first end of the lower pressing part 12 of the pole column can be perfectly fitted into the limiting groove 221.

[0032] Preferably, as Figure 2 , Figure 3 and as shown in 5, the vertical cross-sectional shape of the lower pressing part 12 of the pole column is a "ji" character shape. One limiting part 121 is provided on each side of the lower pressing part 12 of the "ji" character shape. When the lower pressing part 12 of the pole column passes through the installation through hole 210 and exits from the installation guiding hole 220, the two limiting parts 121 of the lower pressing part 12 of the pole column abut against the side wall of the limiting groove 221.

[0033] Preferably, as Figure 3 and Figure 5 shown, the pole column assembly 10 further includes: an insulating part 14 and a sealing part 13. The insulating part 14 is sleeved on the outer surface of the upper pressing part 11 of the pole column, and the sealing part 13 is sleeved on the outer surface of the second end of the lower pressing part 12 of the pole column. After the pole column assembly 10 and the top cover assembly 20 are assembled, the sealing part 13 is located between the bottom wall of the limiting groove 221 and the lower pressing part 12 of the pole column. The first surface of the sealing part 13 abuts against the surface of the limiting part 121, and the second surface of the sealing part 13 abuts against the bottom wall of the limiting groove 221. At least part of the insulating part 14 enters the installation through hole 210 and abuts against the sealing part 13. Through the above settings, the insulating part 14 can be used to isolate the upper pressing part 11 and the lower pressing part 12 of the pole column, avoid the direct contact between the upper pressing part 11 and the lower pressing part 12 of the pole column and the cover plate 21, and improve the stability during the use of the top cover of the battery cell 40. The sealing part 13 can be used to seal the gap between the lower pressing part 12 of the pole column and the limiting groove 221, prevent the leakage of the internal electrolyte of the battery or the intrusion of external moisture and impurities, and ensure the sealing performance of the battery cell 40. Among them, the material of the insulating part 14 is plastic. The sealing part 13 is made of fluororubber or other high-elastic rubber materials.

[0034] Preferred, such as Figure 3 and Figure 9 As shown, the first end of the upper electrode pressing member 11 has a slot 111, and the second end of the upper electrode pressing member 11 has a welding groove 110. The welding groove 110 and the slot 111 share a sidewall. After the second end of the lower electrode pressing member 12 passes through the mounting guide hole 220, the first end of the upper electrode pressing member 11 passes through the mounting through hole 210. At this time, the slot 111 of the upper electrode pressing member 11 abuts against the surface of the second end of the lower electrode pressing member 12. Finally, an external welding device moves along the welding groove 110. The laser welding beam emitted by the external welding device penetrates the sidewall shared by the welding groove 110 and the slot 111, thereby welding the lower electrode pressing member 12 to the bottom sidewall of the welding groove 110, so that the upper electrode pressing member 11 and the lower electrode pressing member 12 form a whole.

[0035] Example 2

[0036] Unlike Example 1, see [link to example]. Figures 6 to 8 The pole assembly 10 further includes a pressure ring 15. The specific installation steps for the pressure ring 15 are as follows: First, the sealing member 13 from Embodiment 1 is fitted onto the second end of the pole lower pressure member 12. The second end of the pole lower pressure member 12 passes through the mounting guide hole 220 and enters the mounting through hole 210. Simultaneously, one side of the sealing member 13 abuts against the limiting part 121, and the second side of the sealing member 13 abuts against the side wall of the limiting groove 221. Then, the insulating member 14 is fitted onto the outer surface of the pressure ring 15, and the pressure ring 15 is fitted onto the outer surface of the pole lower pressure member 12. The pressure ring 15 has a mounting hole 150, which allows the pressure ring 15 to be fitted onto the outer surface of the electrode lower pressure member 12. The insulating member 14 also has a mounting groove 140, the area of ​​which is the same as that of the pressure ring 15. After the pressure ring 15 is placed in the mounting groove 140, it and the insulating member 14 at least partially enter the mounting through hole 210, thereby isolating the pressure ring 15 and the electrode lower pressure member 12 from the pressure plate. Finally, the gap between the pressure ring 15 and the electrode lower pressure member 12 is welded together using an external welding device, so that the electrode lower pressure member 12 and the pressure ring 15 form a whole. Thus, the cover plate 21, the insulating base 22, the electrode lower pressure member 12, the sealing member 13, the insulating member 14, and the pressure ring 15 form a whole, thus forming a complete top cover structure.

[0037] Example 3

[0038] like Figure 2 , Figure 4 and Figure 6As shown, an explosion-proof component 30 is provided in the middle of the electrode assembly 10. Specifically, a mounting cavity 211 is formed in the middle of the cover plate 21, and a shielding hole 222 is formed in the middle of the insulating member 14, which is connected to the mounting cavity 211. The explosion-proof component 30 includes an explosion-proof valve 31 and a protective membrane 32. One end of the explosion-proof valve 31 is connected to the bottom wall of the shielding hole 222, and the other end of the explosion-proof valve 31 is located in the mounting cavity 211. The protective membrane 32 is connected to the first end of the explosion-proof valve 31. The explosion-proof valve 31 can release pressure to the battery cell 40, and the protective membrane 32 can prevent the explosion-proof valve 31 from being contaminated by the outside. The explosion-proof valve 31 is an aluminum sheet with an elliptical shape, and its shape changes with the shape of the mounting cavity 211. It should be noted that the shape of the mounting cavity 211 can also be set to other shapes according to production needs, and the material of the explosion-proof valve 31 can also be changed to other materials with good conductivity and light weight, such as titanium or titanium alloy, according to usage requirements.

[0039] Example 4

[0040] The electrode post pressing member 12 has multiple weight reduction holes. By using these holes, the weight of the electrode post pressing member 12 can be further reduced while maintaining its original function, thereby reducing the overall weight of the top cover assembly 20 and the electrode post assembly 10 after assembly.

[0041] The other structures in this embodiment are the same as those in embodiments 1 to 3, and will not be described again here.

[0042] Example 5

[0043] The cover plate 21 has an insert, and the insulating base 22 has a slot 111. When assembling the cover plate 21 and the insulating base 22, the insert can be inserted into the slot 111, which facilitates quick positioning of the cover plate 21 and the insulating base 22 during assembly and improves the assembly speed.

[0044] The other structures in this embodiment are the same as those in embodiments 1 to 4, and will not be described again here.

[0045] Example 6

[0046] The cover plate 21 has a slot 111, and the insulating base 22 has a plug. When assembling the cover plate 21 and the insulating base 22, the plug can be inserted into the slot 111, which facilitates quick positioning of the cover plate 21 and the insulating base 22 during assembly and improves the assembly speed.

[0047] The other structures in this embodiment are the same as those in Embodiment 5, and will not be described again here.

Claims

1. A battery cell top cover, characterized in that, include: A top cover assembly (20) is provided with pole post assemblies (10) spaced apart on the top cover assembly (20). The pole post assemblies (10) are fixedly connected to the top cover assembly (20). A receiving groove (120) is provided in the pole post assembly (10). An installation guide hole (220) communicating with the receiving groove (120) is provided on the top cover assembly (20).

2. The cell top cover according to claim 1, characterized in that, The top cover assembly (20) includes a cover plate (21) and an insulating base (22) connected to each other. The cover plate (21) has a mounting through hole (210). The pole post assembly (10) passes through the mounting through hole (210). The pole post assembly (10) is disposed between the cover plate (21) and the insulating base (22). The mounting guide hole (220) is opened in the insulating base (22).

3. The cell top cover according to claim 2, characterized in that, The pole assembly (10) includes an upper pole pressing member (11) and a lower pole pressing member (12). A limiting groove (221) is formed on the insulating base (22). The lower pole pressing member (12) passes through the mounting guide hole (220) and abuts against the side wall of the limiting groove (221). The upper pole pressing member (11) passes through the mounting through hole (210) and is fixedly connected to the lower pole pressing member (12). The receiving groove (120) is formed on the lower pole pressing member (12).

4. The cell top cover according to claim 3, characterized in that, The pole assembly (10) further includes a sealing element (13), which is sleeved on the outer surface of the pole pressing element (12), and the outer surface of the sealing element (13) abuts against the side wall of the limiting groove (221).

5. The cell top cover according to claim 4, characterized in that, Each side of the pole post pressing member (12) is provided with a limiting part (121), and the outer surfaces of the two limiting parts (121) abut against the side wall of the limiting groove (221).

6. The cell top cover according to claim 5, characterized in that, The sealing element (13) is sleeved on the outer surface of the pole post pressing element (12). The sealing element (13) is located between the limiting part (121) and the limiting groove (221). The first surface of the sealing element (13) is connected to the surface of the limiting part (121), and the second surface of the sealing element (13) abuts against the side wall of the limiting groove (221).

7. The cell top cover according to claim 3, characterized in that, The pole assembly (10) further includes an insulating member (14), which is sleeved on the outer surface of the pole upper pressure member (11) and at least partially enters the mounting through hole (210).

8. The battery cell top cover according to any one of claims 3 to 7, characterized in that, The upper pressure member (11) of the pole post has a slot (111) at one end near the insulating base (22), and the lower pressure member (12) of the pole post is inserted into the slot (111) at one end near the cover plate (21).

9. The cell top cover according to any one of claims 3 to 7, characterized in that, The upper pressure member (11) of the pole post has a welding groove (110) at one end away from the insulating base (22) for fixing the upper pressure member (11) and the lower pressure member (12) of the pole post.

10. The cell top cover according to any one of claims 3 to 7, characterized in that, The pole assembly (10) further includes a pressure ring (15). The pole lower pressure member (12) passes through the mounting guide hole (220) and the mounting through hole (210) in sequence. After passing through the mounting through hole (210), the pressure ring (15) is sleeved on the outer surface of the pole lower pressure member (12) and fixedly connected to the pole lower pressure member (12).

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