Battery top cover structure and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover structure and a single battery. The cover plate comprises a cover plate body, a first plastic part and at least one electrode assembly, the electrode assembly comprises a pole, a second plastic part and a fixing block, the pole comprises a first end and a second end, the first end is arranged on the side, away from the cover plate body, of the first plastic part, and the first plastic part, the cover plate body, the second plastic part and the fixing block are all provided with mounting holes. The second end hermetically penetrates through the mounting hole of the first plastic part, the mounting hole of the cover plate body, the mounting hole of the second plastic part and the mounting hole of the fixing block and is fixedly connected with the fixing block; a first exhaust groove is formed in the side, facing the cover plate body, of the fixing block, and the first exhaust groove communicates with the mounting hole and the outside. According to the battery top cover structure, on the basis of ensuring the structural strength of the pole, the first exhaust groove is additionally arranged to exhaust gas generated during welding of the pole and the cover plate body, and the accuracy of a helium detection sealing test result is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover structure and a single cell battery. Background Art

[0002] With the rapid development of new energy vehicles, the power battery, as the power source of new energy vehicles, is one of the key components of new energy vehicles. The battery top cover structure is the core component of safety and sealing performance, and its performance stability is crucial for the battery.

[0003] Currently, the battery top cover structures applied in the market usually include a cover body and several pole column assemblies. Between the pole column assemblies and the cover body, and between the cover body and the battery housing, they are mainly fixed by welding to ensure the structural strength of the battery top cover structure. However, high-temperature and high-pressure steam is easily generated during welding. The upper plastic and the fixing block in the pole column assembly are in a fitting state and cannot discharge the steam, so that the steam is discharged from the molten welding area, resulting in bulges and welding holes on the battery top cover, thereby affecting the performance of the battery using this battery top cover structure. Moreover, the upper plastic and the fixing block in the pole column assembly are in a fitting state, with a certain sealing performance. If the sealing ring is omitted between the pole column and the cover body, there is a possibility that the helium leak detection equipment cannot detect the omission of the sealing ring during the sealing performance detection, so there is a possibility that defective products flow out to the client.

[0004] Therefore, there is an urgent need for a battery top cover structure and a single cell battery to solve the above technical problems. Summary of the Utility Model

[0005] An object of the utility model is to provide a battery top cover structure, which can increase a first exhaust groove on the basis of ensuring the structural strength of the pole column itself to discharge the gas generated during the welding of the pole column and the cover body, and is helpful to improve the accuracy of the helium leak detection and sealing test results.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery top cover structure includes a cover body, a first plastic part and at least one electrode assembly. The electrode assembly includes a pole column, a second plastic part and a fixing block. The pole column includes a first end and a second end. The first end is arranged on the side of the first plastic part away from the cover body. The first plastic part, the cover body, the second plastic part and the fixing block are all provided with mounting holes. The second end is hermetically inserted through the mounting holes of the first plastic part, the cover body, the second plastic part and the fixing block and is fixedly connected to the fixing block. Wherein, a first exhaust groove is formed on the side of the fixing block facing the cover body, and the first exhaust groove communicates the mounting hole with the outside.

[0008] Optionally, the first exhaust groove includes an annular groove and at least one connecting groove. The annular groove is arranged to communicate with the mounting hole, and the connecting groove communicates with the annular groove and penetrates through the side wall of the fixing block from the annular groove towards the outside to communicate with the outside.

[0009] Optionally, the first exhaust groove further includes a plurality of heat dissipation grooves. The heat dissipation grooves are uniformly arranged on one side of the fixing block facing the cover plate body, and the heat dissipation grooves communicate with the annular groove and / or the connecting groove.

[0010] Optionally, the groove depth of the first exhaust groove is W, and the thickness of the fixing block is D, where W ≤ 1 / 2D.

[0011] Optionally, the first exhaust groove is formed by stamping.

[0012] Optionally, a second exhaust groove is provided on one side of the second plastic part facing the fixing block, and the second exhaust groove communicates with the mounting hole and the outside.

[0013] Optionally, the electrode assembly further includes a seal, and the seal is arranged between the pole post and the hole wall of the mounting hole.

[0014] Optionally, a gap is provided between the inner peripheral wall of the second plastic part and the outer peripheral wall of the fixing block, and the first exhaust groove communicates with the gap so that the mounting hole communicates with the outside; or

[0015] A through groove is provided on the outer peripheral wall of the fixing block, and the through groove communicates the first exhaust groove and the outside.

[0016] Optionally, the second plastic part includes a connected horizontal part and a vertical part. The horizontal part is arranged between the fixing block and the cover plate body, and the gap or the through groove is provided between the vertical part and the outer peripheral wall of the fixing block.

[0017] Another object of the present invention is to provide a single cell, which can increase the first exhaust groove on the basis of ensuring the structural strength of the pole post itself, so as to discharge the gas generated during the welding of the pole post and the cover plate body, and is helpful to improve the accuracy of the helium leak detection sealing test result.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A single cell includes a housing, an electric core, and the above-mentioned battery top cover structure. The electric core is arranged in the housing, and the battery top cover structure is hermetically connected to the opening of the housing.

[0020] The beneficial effects of the present invention:

[0021] The present utility model provides a battery top cover structure and a single cell battery. By providing a first exhaust groove on one side of the fixing block facing the cover body, during the welding process of the fixing block and the pole column, the high-temperature and high-pressure steam generated can be discharged through the first exhaust groove between the fixing block and the second plastic part, thus effectively avoiding the problems of bulging and welding holes caused by the inability to discharge high-temperature and high-pressure steam, and improving the reliability of the battery top cover structure. At the same time, when the single cell battery equipped with this battery top cover structure is subjected to helium leak detection and sealing test, the exhaust groove forms a helium leak detection channel, which can directly detect whether the installation hole is sealed, improving the accuracy of the helium leak detection and sealing test results. Moreover, the setting of the first exhaust groove does not significantly affect the structural strength of the fixing block, and the first exhaust groove provided on the fixing block can ensure the manufacturing precision of the first exhaust groove during the processing, enabling it to better play the role of welding exhaust and helium leak detection channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded view of the battery top cover structure provided by the specific embodiment of the present utility model;

[0023] Figure 2 is a top view of the battery top cover structure provided by the specific embodiment of the present utility model;

[0024] Figure 3 is Figure 2 a sectional view taken along line A-A in

[0025] Figure 4 is Figure 3 an enlarged view of B in

[0026] Figure 5 is an axonometric view of the fixing block provided by some embodiments of the present utility model;

[0027] Figure 6 is an axonometric view of the fixing block provided by some other embodiments of the present utility model;

[0028] Figure 7 is an axonometric view of the second plastic part provided by some embodiments of the present utility model.

[0029] In the figure:

[0030] 101, installation hole; 10, cover body; 20, first plastic part;

[0031] 30, electrode assembly; 31, pole column; 32, second plastic part; 321, horizontal part; 322, vertical part; 323, second exhaust groove; 33, fixing block; 34, first exhaust groove; 341, annular groove; 342, communication groove; 343, heat dissipation groove; 35, gap; 36, through groove; 37, seal;

[0032] 40, liquid injection structure; 50, explosion-proof structure. Detailed implementation manners

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0037] Next, refer to Figures 1 to 7 to introduce the battery top cover structure and the single cell provided by the present utility model.

[0038] Please refer to Figures 1 to 4, this embodiment provides a battery top cover structure, which includes a cover plate body 10, a first plastic part 20, and at least one electrode assembly 30. The electrode assembly 30 includes a pole column 31, a second plastic part 32, and a fixing block 33. The pole column 31 includes a first end and a second end. The first end is disposed on the side of the first plastic part 20 away from the cover plate body 10. The first plastic part 20, the cover plate body 10, the second plastic part 32, and the fixing block 33 are all provided with mounting holes 101. The second end is hermetically passed through the mounting hole 101 of the first plastic part 20, the mounting hole 101 of the cover plate body 10, the mounting hole 101 of the second plastic part 32, and the mounting hole 101 of the fixing block 33 and fixedly connected to the fixing block 33. Wherein, a first exhaust groove 34 is formed on the side of the fixing block 33 facing the cover plate body 10, and the first exhaust groove 34 communicates the mounting hole 101 with the outside.

[0039] In the battery top cover structure of this embodiment, by forming a first exhaust groove 34 on the side of the fixing block 33 facing the cover plate body 10, during the welding process of the fixing block 33 and the pole column 31, the high-temperature and high-pressure steam generated can be discharged through the first exhaust groove 34 between the fixing block 33 and the second plastic part 32, thereby effectively avoiding the problems of bulging and welding holes caused by the inability to discharge high-temperature and high-pressure steam, and improving the reliability of the battery top cover structure. At the same time, when the single cell equipped with this battery top cover structure is subjected to helium leak detection and sealing test, the exhaust groove forms a helium leak detection channel, and the sealing of the mounting hole 101 can be directly detected, improving the accuracy of the helium leak detection and sealing test results. Moreover, the setting of the first exhaust groove 34 does not greatly affect the structural strength of the fixing block 33, and the first exhaust groove 34 formed on the fixing block 33 can ensure the manufacturing accuracy of the first exhaust groove 34 during the processing, enabling it to better play the role of welding exhaust and helium leak detection channel.

[0040] Please refer to Figure 4 and Figure 5 , specifically, the first exhaust groove 34 includes an annular groove 341 and at least one connecting groove 342. The annular groove 341 is communicated with the mounting hole 101. The connecting groove 342 is communicated with the annular groove 341 and penetrates through the side wall of the annular groove 341 facing the fixing block 33 to communicate with the outside, so as to realize the communication between the mounting hole 101 and the outside.

[0041] Optionally, a plurality of connecting grooves 342 are provided at intervals, that is, the exhaust channels are increased, thereby accelerating the discharge rate of the high-temperature and high-pressure steam.

[0042] Please refer to Figure 6, in some embodiments, the first exhaust groove 34 further includes a plurality of heat dissipation grooves 343, which are evenly distributed on the side of the fixed block 33 facing the cover plate body 10, and the heat dissipation grooves 343 communicate with the annular groove 341 and / or the communication groove 342. With this setting, most positions of the fixed block 33 can communicate with the outside, avoiding problems such as bulging caused by the inability to discharge local gas, and further improving the reliability of the battery top cover structure.

[0043] Optionally, the groove depth of the first exhaust groove 34 is W, and the thickness of the fixed block 33 is D, where W ≤ 1 / 2D. This setting can avoid reducing the structural strength of the fixed block 33 and achieve its exhaust connection function.

[0044] Optionally, the first exhaust groove 34 is formed by stamping, which is simple to manufacture and has high manufacturing accuracy.

[0045] Please refer to Figure 4 , in some embodiments, there is a gap 35 between the inner peripheral wall of the second plastic part 32 and the outer peripheral wall of the fixed block 33, and the first exhaust groove 34 communicates with the gap 35 so that the mounting hole 101 communicates with the outside. That is, the gap 35 existing between the inner peripheral wall of the second plastic part 32 and the outer peripheral wall of the fixed block 33 is used to realize the communication between the first exhaust groove 34 and the outside, without adding other structures, which is simple to manufacture.

[0046] Please refer to Figure 7 , in some embodiments, a through groove 36 is formed in the outer peripheral wall of the fixed block 33, and the through groove 36 communicates the first exhaust groove 34 with the outside. This setting increases the communication area between the first exhaust groove 34 and the outside, so that the high-temperature and high-pressure steam generated during welding can be discharged better and faster, and the test structure accuracy of helium leak detection is also higher.

[0047] Specifically, the second plastic part 32 includes a connected horizontal part 321 and a vertical part 322. The horizontal part 321 is arranged between the fixed block 33 and the cover plate body 10, and there is a gap 35 or a through groove 36 between the vertical part 322 and the outer peripheral wall of the fixed block 33, so that the communication between the first exhaust groove 34 and the outside can be realized.

[0048] In some embodiments, a second exhaust groove 323 is provided on the side of the second plastic part 32 facing the fixed block 33. The second exhaust groove 323 communicates the mounting hole 101 with the outside. The setting of the second exhaust groove 323 further increases the exhaust area between the second plastic part 32 and the fixed block 33, thereby further increasing the exhaust area of the high-temperature and high-pressure steam generated during welding and the accuracy of helium leak detection.

[0049] It should be noted that the specific structure of the second exhaust groove 323 can be the same as that of the first exhaust groove 34, which will not be elaborated here.

[0050] Please refer toFigure 3 and Figure 4 In some embodiments, the electrode assembly 30 further includes a seal 37 disposed between the pole column 31 and the wall of the mounting hole 101. The provision of the seal 37 can achieve the sealing between the pole column 31 and the mounting hole 101, ensuring the sealing inside the single cell with the battery top cover structure installed.

[0051] Please refer to Figure 2 In some embodiments, the battery top cover structure further includes a liquid injection structure 40 disposed on the cover body 10. The liquid injection structure 40 is used to inject electrolyte into the single cell with the battery top cover structure installed.

[0052] In some embodiments, the battery top cover structure further includes an explosion-proof structure 50 disposed on the cover body 10. The explosion-proof structure 50 is used for the explosion-proof and pressure relief of the single cell with the battery top cover structure installed.

[0053] This embodiment also provides a single cell, which includes a housing, an electrode core, and the battery top cover structure of any of the above solutions. The electrode core is disposed inside the housing, and the battery top cover structure is sealingly connected to the opening of the housing. The single cell includes all the beneficial effects of the battery top cover structure of any of the above solutions, which will not be elaborated here.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery top cover structure, characterized in that, It includes a cover plate body (10), a first plastic part (20) and at least one electrode assembly (30). The electrode assembly (30) includes a pole column (31), a second plastic part (32) and a fixing block (33). The pole column (31) includes a first end and a second end. The first end is arranged on the side of the first plastic part (20) away from the cover plate body (10). The first plastic part (20), the cover plate body (10), the second plastic part (32) and the fixing block (33) are all provided with mounting holes (101). The second end is hermetically inserted through the mounting hole (101) of the first plastic part (20), the mounting hole (101) of the cover plate body (10), the mounting hole (101) of the second plastic part (32) and the mounting hole (101) of the fixing block (33) and fixedly connected to the fixing block (33). Wherein, a first exhaust groove (34) is formed on the side of the fixing block (33) facing the cover plate body (10), and the first exhaust groove (34) communicates the mounting hole (101) with the outside.

2. The battery top cover structure according to claim 1, wherein, The first exhaust groove (34) includes an annular groove (341) and at least one connecting groove (342). The annular groove (341) is arranged to communicate with the mounting hole (101). The connecting groove (342) communicates with the annular groove (341) and penetrates through the side wall of the fixing block (33) from the annular groove (341) to communicate with the outside.

3. The battery top cover structure according to claim 2, wherein The first exhaust groove (34) further includes a plurality of heat dissipation grooves (343). The heat dissipation grooves (343) are uniformly arranged on the side of the fixing block (33) facing the cover plate body (10). The heat dissipation grooves (343) communicate with the annular groove (341) and / or the connecting groove (342).

4. The battery top cover structure according to claim 1, wherein, The groove depth of the first exhaust groove (34) is W, and the thickness of the fixing block (33) is D, where W ≤ 1 / 2D.

5. The battery top cover structure according to claim 1, characterized in that, The first exhaust groove (34) is formed by stamping.

6. The battery top cover structure according to claim 1, characterized in that, A second exhaust groove (323) is provided on the side of the second plastic part (32) facing the fixing block (33). The second exhaust groove (323) communicates the mounting hole (101) with the outside.

7. The battery top cover structure according to claim 1, characterized in that The electrode assembly (30) further includes a sealing member (37). The sealing member (37) is arranged between the pole column (31) and the inner wall of the mounting hole (101).

8. The battery top cover structure according to any one of claims 1-7, characterized in that a gap (35) is provided between the inner peripheral wall of the second plastic part (32) and the outer peripheral wall of the fixing block (33). The first exhaust groove (34) communicates with the gap (35) so that the mounting hole (101) communicates with the outside; or a through groove (36) is formed on the outer peripheral wall of the fixing block (33). The through groove (36) communicates the first exhaust groove (34) with the outside.

9. The battery top cover structure according to claim 8, wherein, The second plastic part (32) includes a transverse part (321) and a vertical part (322) that are connected to each other. The transverse part (321) is disposed between the fixed block (33) and the cover plate body (10), and a gap (35) or a through groove (36) is provided between the vertical part (322) and the outer peripheral wall of the fixed block (33).

10. A single cell, characterized in that, It includes a housing, an electric core, and a battery top cover structure as described in any one of claims 1-9. The electric core is disposed inside the housing, and the battery top cover structure is sealingly connected to the opening of the housing.

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