Battery cover plate assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate assembly and a single battery. The battery cover plate assembly comprises a cover plate body, a temperature-sensitive valve structure and at least one pole, the at least one pole is arranged on the cover plate body in an insulated and sealed mode, the pole is provided with a first end and a second end, the first end is used for being electrically connected with a battery cell, the second end is used for being externally connected, the second end is provided with an installation groove, and the installation groove communicates with the first end; an edge rolling stop part is arranged at the position, close to an opening of the second end, of the groove wall of the mounting groove, and a temperature-sensitive valve structure is arranged in the mounting groove in a sealed mode and limited and stopped by the edge rolling stop part. According to the battery cover plate assembly, the stability of the battery cover plate assembly in the production process and the reliability of the product quality can be improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover plate assembly and a single battery. Background Technique

[0002] A battery cover plate refers to a plate-shaped material used to cover new energy batteries and is usually used to wrap and protect the batteries. It can be used for various types of new energy batteries, including lithium batteries, lithium cobalt oxide batteries, nickel-metal hydride batteries, etc. Moreover, the battery cover plate usually needs to have a certain strength and wear resistance to protect the internal structure of the battery from the external environment and collisions. At the same time, it also needs to have a certain heat conduction performance to help the battery dissipate heat. With the rapid development of new energy vehicles, the new energy battery cover plate is constantly being improved and innovated to meet the changing needs.

[0003] In the prior art, a temperature-sensitive valve is also equipped in the battery cover plate to monitor the temperature of the single battery, thereby improving safety. However, the installation process of the temperature-sensitive valve configured in the battery cover plate is complex and has significant defects. The specific process is as follows: First, a groove is opened on the cover plate body and a sealing ring is embedded, then the cover plate body is placed on the sealing ring, and then a temperature-sensitive valve plastic part is installed thereon. During the above process, when connecting the plastic part to the cover plate body through a welding ring, due to the extremely unstable welding operation, welding quality problems are likely to occur, including but not limited to phenomena such as welding holes, explosion of the welding flame, false welding, and welding deviation, seriously affecting the product quality. Particularly seriously, the use of the welding positioning ring often causes local burning of the temperature-sensitive valve plastic part, thereby leading to air leakage problems, with a low product qualification rate and high costs. This series of problems not only increases the defective rate during the production process but also poses a major challenge to the manufacturing efficiency and reliability of the entire battery top cover.

[0004] Therefore, there is an urgent need for a new type of battery cover plate assembly and a single battery, aiming to solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery cover plate assembly, which can improve the stability of the production process of the battery cover plate assembly and the reliability of the product quality, and at the same time reduce the production cost.

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

[0007] The battery cover plate assembly includes:

[0008] A cover plate body;

[0009] At least one terminal post, which is insulated and hermetically arranged on the cover plate body. The terminal post has a first end and a second end. The first end is used for electrically connecting with the battery cell, and the second end is used for external electrical connection. An installation groove is formed at the second end. The installation groove communicates with the first end, and a hemming stop portion is arranged on the groove wall of the installation groove near the opening of the second end. A thermosensitive valve structure is hermetically arranged in the installation groove, and the thermosensitive valve structure is limited and stopped by the hemming stop portion.

[0010] Optionally, a sealing groove is formed at the bottom of the installation groove, and a first sealing member is arranged in the sealing groove. The first sealing member is used for hermetically connecting the thermosensitive valve structure with the installation groove.

[0011] Optionally, a through hole is formed at the bottom of the installation groove, and the through hole extends through the first end so that the installation groove communicates with the first end.

[0012] Optionally, the thermosensitive valve structure includes a connected thermosensitive plastic component and a transition piece, and the transition piece is arranged on the side of the thermosensitive plastic component facing the first end.

[0013] Optionally, the transition piece is formed by a heat-conducting member.

[0014] Optionally, the thermosensitive valve structure includes a step portion, and the step portion is used for cooperating with the hemming stop portion to limit and stop the thermosensitive valve structure in the installation groove by the hemming stop portion.

[0015] Optionally, at least one terminal post assembly hole is formed in the cover plate body, and a terminal post assembly groove is formed on the hole wall of the terminal post assembly hole. The terminal post is insulated and hermetically installed in the terminal post assembly groove; an annular hemming is arranged on the side of the terminal post assembly groove facing the second end, and the annular hemming is used for limiting and stopping the terminal post.

[0016] Optionally, the battery cover plate assembly includes a rubber-coated part, and the rubber-coated part covers the outer periphery of the terminal post to insulate the terminal post and the groove wall of the terminal post assembly groove.

[0017] Optionally, a rotation prevention structure is further arranged between the thermosensitive valve structure and the groove wall of the installation groove to prevent relative rotation between the thermosensitive valve structure and the groove wall of the installation groove.

[0018] Another object of the present invention is to provide a single battery cell, which can improve the stability in the production process of the single battery cell and the reliability of the product quality, and at the same time reduce the production cost.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] The single cell includes the above-mentioned battery cover assembly

[0021] Advantages of the present utility model:

[0022] The present utility model provides a battery cover assembly and a single cell. The battery cover assembly is provided with a temperature-sensitive valve structure that can be opened when the temperature in the single cell where the battery cover assembly is installed reaches a preset value, improving the safety of the product. Moreover, by arranging the temperature-sensitive valve structure on the pole column, when there is a problem with the installation or the temperature-sensitive valve structure itself, only the pole column needs to be replaced, reducing the cost of replacement and maintenance. In addition, the temperature-sensitive valve structure is fixed in the installation groove through the cooperation of the rolled edge stop portion and the bottom of the installation groove, that is, it is installed and fixed by the rolling process, which not only ensures the fixing stability of the temperature-sensitive valve structure, but also avoids welding to prevent the temperature-sensitive valve from opening prematurely due to overheating during welding, resulting in air leakage of the single cell where the battery cover assembly is installed, improving the stability of the product production process and the reliability of the product quality, thereby increasing the product yield rate, while also reducing the production cost and the finished product scrap rate. Description of the drawings

[0023] Figure 1 is the top view of the battery cover assembly provided by the specific embodiment of the present utility model;

[0024] Figure 2 is Figure 1 the cross-sectional view at A-A in

[0025] Figure 3 is Figure 2 the partial enlarged view of the installation of the temperature-sensitive valve structure at B in

[0026] Figure 4 is Figure 2 the partial enlarged view of the non-installation of the temperature-sensitive valve structure at B in

[0027] In the figure:

[0028] 10. Cover body; 11. Pole column assembly hole; 12. Pole column assembly groove; 13. Annular rolled edge;

[0029] 20. Pole column; 21. First end; 22. Second end; 221. Installation groove; 222. Sealing groove; 23. Rolled edge stop portion; 24. Through hole;

[0030] 30. Temperature-sensitive valve structure; 31. Temperature-sensitive plastic component; 311. Step portion; 32. Transition piece;

[0031] 40. First sealing member; 50. Encapsulation member; 60. Explosion-proof structure; 70. Liquid injection structure; 80. Second sealing member. Specific embodiments

[0032] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining 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 are shown in the drawings, rather than all the structures.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. 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 circumstances.

[0034] 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 of 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 and to the right", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the left", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0035] 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, and are 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, and therefore 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.

[0036] This embodiment provides a battery cover assembly to avoid the problem of the failure of the installation of the temperature-sensitive valve, improve the stability of the production process of the battery cover assembly and the reliability of the product quality, and at the same time reduce the production cost.

[0037] Please refer to Figures 1 to 4, specifically, the battery cover assembly includes a cover body 10, a temperature-sensitive valve structure 30, and at least one pole 20. The at least one pole 20 is insulated and sealed on the cover body 10. The pole 20 has a first end 21 and a second end 22. The first end 21 is used for electrical connection with the battery cell, and the second end 22 is used for external electrical connection. An installation groove 221 is formed at the second end 22. The installation groove 221 communicates with the first end 21, and a rolled-edge stop portion 23 is provided at the opening of the groove wall of the installation groove 221 near the second end 22. A temperature-sensitive valve structure 30 is sealed in the installation groove 221, and the temperature-sensitive valve structure 30 is limited and stopped by the rolled-edge stop portion 23.

[0038] The battery cover assembly in this embodiment is provided with a temperature-sensitive valve structure 30 that can be opened when the temperature in the single battery where the battery cover assembly is installed reaches a preset value, improving the product safety; and by arranging the temperature-sensitive valve structure 30 on the pole 20, when there is a problem with the installation of the temperature-sensitive valve structure 30 or the structure itself, only the pole 20 needs to be replaced, reducing the cost of replacement and maintenance. Moreover, the temperature-sensitive valve structure 30 is fixed in the installation groove 221 by the cooperation of the rolled-edge stop portion 23 and the bottom of the installation groove 221, that is, it is installed and fixed by the rolling process, which not only ensures the fixing stability of the temperature-sensitive valve structure 30, but also avoids welding to prevent the problem of premature opening and failure of the temperature-sensitive valve caused by overheating during welding, resulting in air leakage of the single battery where the battery cover assembly is installed, improving the stability of the product production process and the reliability of the product quality, thereby improving the product yield rate, and at the same time reducing the production cost and the finished product scrap rate.

[0039] It can be understood that when the battery cover assembly is not processed and assembled, a boss is provided at the opening of the installation groove 221 near the second end 22. During the assembly process, after the temperature-sensitive valve structure 30 is installed in the installation groove 221, the boss is roll-riveted into a rolled-edge stop portion 23 that limits and stops the temperature-sensitive valve structure 30 by means of roll-riveting, so as to realize the fixation of the temperature-sensitive valve structure 30.

[0040] Please refer to Figure 3 , optionally, the temperature-sensitive valve structure 30 includes a stepped portion 311. The stepped portion 311 is used for cooperating and connecting with the rolled-edge stop portion 23, so that the temperature-sensitive valve structure 30 is limited and stopped by the rolled-edge stop portion 23 in the installation groove 221, that is, the stepped portion 311 is used for cooperating with the rolled-edge stop portion 23, so that it limits the temperature-sensitive valve structure 30 not only axially but also radially, improving the connection stability of the temperature-sensitive valve structure 30.

[0041] Please refer to Figure 4, optionally, a through hole 24 is formed in the bottom of the installation groove 221, and the through hole 24 extends through the first end 21, so that the installation groove 221 communicates with the first end 21, thereby enabling the temperature-sensitive valve structure 30 to communicate with the inside of the single cell equipped with the battery cover assembly, enabling it to detect the temperature inside the single cell in real time, and thus performing its own opening and closing control, thereby improving the safety of the single cell.

[0042] Optionally, a sealing groove 222 is formed in the bottom of the installation groove 221, and a first sealing member 40 is provided in the sealing groove 222. The first sealing member 40 is used to seal the connection between the temperature-sensitive valve structure 30 and the installation groove 221 to ensure the tightness of the battery cover assembly itself, so that the tightness of the single cell equipped with the battery cover assembly is better after installation.

[0043] Please refer to Figure 3 , in some embodiments, the temperature-sensitive valve structure 30 includes a connected temperature-sensitive plastic component 31 and a transition member 32. The transition member 32 is disposed on the side of the temperature-sensitive plastic component 31 facing the first end 21, so that the temperature-sensitive valve structure 30 can sense the temperature inside the single cell.

[0044] Specifically, a groove is formed on the side of the temperature-sensitive plastic component 31 facing the transition member 32, and the transition member 32 is disposed in the groove, thereby realizing the placement of the transition member 32.

[0045] Optionally, the transition member 32 is made of a heat-conducting member to conduct the heat inside the single cell, so that the temperature-sensitive plastic component 31 can be better used as a temperature-sensitive valve.

[0046] In some embodiments, a rotation prevention structure is further provided between the temperature-sensitive valve structure 30 and the groove wall of the installation groove 221 to prevent relative rotation between the temperature-sensitive valve structure 30 and the groove wall of the installation groove 221. Such a setting avoids problems such as sealing failure caused by the rotation of the temperature-sensitive valve structure 30 and improves the installation reliability of the temperature-sensitive valve structure 30.

[0047] Optionally, the rotation prevention structure includes a protrusion and a groove. One of the protrusion and the groove is disposed on the temperature-sensitive valve structure 30, and the other is disposed on the groove wall of the installation groove 221, thereby realizing the mating connection between the two. It can be understood that in other embodiments, the rotation prevention structure can also be other structures for preventing the rotation of the pole column 20 and the temperature-sensitive valve structure 30, which are not specifically limited herein.

[0048] Please refer to Figure 3 and Figure 4, in some embodiments, the cover body 10 is provided with at least one pole assembly hole 11. A pole assembly groove 12 is formed on the hole wall of the pole assembly hole 11. The pole 20 is installed in the pole assembly groove 12 in an insulated and sealed manner; an annular bead 13 is provided on one side of the pole assembly groove 12 facing the second end 22. The annular bead 13 is used to limit and stop the pole 20, so as to realize the installation and fixation of the pole 20 on the cover body 10. It can be understood that the annular bead 13 is also realized by the bead processing technology such as the above-mentioned bead stop portion 23, which will not be elaborated here.

[0049] In some embodiments, the battery cover assembly includes a rubber-coated part 50. The rubber-coated part 50 is wrapped around the outer periphery of the pole 20 to insulate the pole 20 and the groove wall of the pole assembly groove 12. The rubber-coated part 50 is used to insulate the outer periphery of the pole 20 from the cover body 10, so as to realize the insulation of the pole 20.

[0050] In some embodiments, the battery cover assembly further includes a lower plastic part. The lower plastic part is arranged on one side of the cover body 10. Specifically, it is arranged on the side close to the inside of the single cell, so that the cover body 10 is insulated from the battery core inside the single cell.

[0051] In some embodiments, the battery cover assembly further includes an explosion-proof structure 60. The explosion-proof structure 60 is arranged on the cover body 10 to realize the explosion-proof pressure relief of the single cell assembled by the battery cover assembly.

[0052] In some embodiments, the battery cover assembly further includes a liquid injection structure 70. The liquid injection structure 70 is arranged on the cover body 10 to realize the liquid injection of the single cell assembled by the battery cover assembly.

[0053] In some embodiments, the battery cover assembly further includes a second seal 80. The second seal 80 is arranged between the pole 20 and the pole assembly hole 11, so that the pole 20 and the pole assembly hole 11 are sealed, improving the sealing performance of the battery cover assembly.

[0054] This embodiment also provides a single cell. The single cell includes the battery cover assembly described in any of the above solutions. The single cell has the beneficial effects of the battery cover assembly described in any of the above solutions, which will not be elaborated here. Specifically, by arranging the temperature-sensitive valve structure 30 on the pole 20 in the form of a bead, the single cell not only reduces the maintenance and production costs, but also improves the installation reliability of the temperature-sensitive valve structure 30, thereby improving the stability of the product production process and the reliability of the product quality, thus improving the product yield rate, and at the same time reducing the production cost and the finished product scrap rate.

[0055] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. 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 utility model. 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 utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Battery cover assembly, characterized in that, Comprising: A cover body (10); At least one pole post (20), which is insulated and hermetically arranged on the cover body (10). The pole post (20) has a first end (21) and a second end (22). The first end (21) is used for electrically connecting with the battery cell, and the second end (22) is used for external electrical connection. An installation groove (221) is formed at the second end (22). The installation groove (221) communicates with the first end (21), and a hemming stop portion (23) is arranged on the groove wall of the installation groove (221) near the opening of the second end (22). A thermosensitive valve structure (30) is hermetically arranged in the installation groove (221), and the thermosensitive valve structure (30) is limited and stopped by the hemming stop portion (23).

2. The battery cover plate assembly according to claim 1, wherein, A sealing groove (222) is formed at the bottom of the installation groove (221). A first sealing member (40) is arranged in the sealing groove (222), and the first sealing member (40) is used for hermetically connecting the thermosensitive valve structure (30) with the installation groove (221).

3. The battery cover plate assembly according to claim 1, wherein, A through hole (24) is formed at the bottom of the installation groove (221). The through hole (24) extends through the first end (21) so that the installation groove (221) communicates with the first end (21).

4. The battery cover plate assembly according to claim 1, characterized in that, The thermosensitive valve structure (30) includes a connected thermosensitive plastic component (31) and a transition member (32). The transition member (32) is arranged on the side of the thermosensitive plastic component (31) facing the first end (21).

5. The battery cover assembly according to claim 4, wherein The transition member (32) is made of a heat-conducting member.

6. The battery cover assembly according to claim 1, characterized in that The thermosensitive valve structure (30) includes a step portion (311), and the step portion (311) is used for cooperating and connecting with the hemming stop portion (23) so that the thermosensitive valve structure (30) is limited and stopped by the hemming stop portion (23) in the installation groove (221).

7. The battery cover plate assembly according to claim 1, wherein, The cover body (10) is provided with at least one pole post assembly hole (11). A pole post assembly groove (12) is formed on the hole wall of the pole post assembly hole (11). The pole post (20) is insulated and hermetically installed in the pole post assembly groove (12). An annular hemming (13) is arranged on the side of the pole post assembly groove (12) facing the second end (22), and the annular hemming (13) is used for limiting and stopping the pole post (20).

8. The battery cover assembly according to claim 7, wherein, The battery cover assembly includes a rubber-coated member (50). The rubber-coated member (50) covers the outer periphery of the pole post (20) to insulate the pole post (20) and the groove wall of the pole post assembly groove (12).

9. The battery cover assembly according to any one of claims 1-8, characterized in that, A rotation prevention structure is further arranged between the thermosensitive valve structure (30) and the groove wall of the installation groove (221) to prevent relative rotation between the thermosensitive valve structure (30) and the groove wall of the installation groove (221).

10. A single cell, characterized in that, Including the battery cover assembly according to any one of claims 1-9.

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