A battery top cover and a single battery

Abstract

The utility model belongs to battery technical field discloses a kind of battery top cover and single battery.Battery top cover includes pole, heat conduction sheet and cover sheet, heat conduction sheet includes sleeve setting part and extension, sleeve setting part is sleeved in pole and is abutted with pole, pole is isolated with cover sheet, so that the heat on pole can be directly transferred to sleeve setting part when battery is charged and discharged, avoid the heat on pole to be heat-dissipated by battery inside layer by layer to battery shell, shorten battery heat transfer path, reduce battery thermal resistance, to accelerate the heat-dissipation speed of pole, in addition, extension can extend to the direction away from pole, utilize extension to enlarge the surface area of heat conduction sheet, heat is transferred from sleeve setting part to extension, can further improve the heat-dissipation efficiency of heat conduction sheet, to improve the uniformity of battery internal temperature distribution further, guarantee the good use performance and safety of battery, prolong the service life of battery.

Description

Technical Field

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

[0002] In recent years, the global electrification process has continued to advance, leading to a rapid increase in battery demand. Lithium-ion batteries are highly sensitive to temperature. At higher temperatures, lithium-ion battery impedance decreases and performance improves, but high temperatures also accelerate the degradation rate of lithium-ion batteries. Conversely, at lower temperatures, the internal resistance of lithium-ion batteries increases, and battery performance deteriorates. To ensure good performance and excellent cycle life of lithium-ion batteries, it is necessary to control their operating temperature within a certain range.

[0003] During battery charging or discharging, the areas with the most heat are mainly concentrated at the terminals. Since the battery casing has a relatively large area and the terminals have a relatively small area, the battery is usually cooled by dissipating heat through the surface of the casing. However, the thermal resistance in the process of heat transfer from the terminals to the casing is relatively large, resulting in a large temperature gradient inside the battery. This can easily lead to localized overheating, affecting the battery's performance, lifespan, and safety.

[0004] Therefore, there is an urgent need for a battery top cover and individual battery cells to solve the above problems. Utility Model Content

[0005] One objective of this invention is to provide a battery top cover that can directly transfer heat from the terminals to the outside of the battery, shorten the heat transfer path, reduce the battery thermal resistance, and ensure the battery's lifespan and safety.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery top cover is provided, comprising:

[0008] Cover plate;

[0009] The electrode post includes an upper electrode post and a through part, the upper electrode post being located above the cover plate, and the through part passing through the cover plate;

[0010] A heat-conducting sheet, the heat-conducting sheet including a sleeve portion and an extension portion, the sleeve portion being disposed between the cover plate and the through portion and abutting against the through portion, the extension portion being disposed between the upper pole and the cover plate.

[0011] As an alternative to the battery top cover, the battery top cover also includes a heat sink, which is sleeved on the upper electrode post and abuts against the upper surface of the extension.

[0012] As an alternative to the battery top cover, the heat sink has a plurality of protrusions on the side facing the extension, and the protrusions abut against the extension.

[0013] As an alternative to the battery top cover, the heat-conducting sheet is configured as an aluminum nitride ceramic sheet.

[0014] As an alternative to the battery top cover, a limiting groove is provided on the upper surface of the cover plate, and the extension is limited to the limiting groove.

[0015] As an alternative to the battery top cover, the battery top cover also includes an upper insulating member, which is located above the heat-conducting sheet and covers the bottom surface and side wall of the upper electrode post.

[0016] As an alternative to the battery top cover, the terminal post further includes a lower terminal post, which is connected to the through portion and located below the cover plate. The battery top cover also includes a lower insulating member, which is disposed between the lower terminal post and the cover plate.

[0017] As an alternative to the battery top cover, the battery top cover also includes a sealing ring, which is sleeved on the terminal post and located between the terminal post and the lower insulating member.

[0018] As an alternative to the battery top cover, the cover plate is provided with explosion-proof holes, and the battery top cover also includes an explosion-proof structure, which covers the explosion-proof holes and is connected to the cover plate.

[0019] Another objective of this invention is to provide a single-cell battery that can reduce the internal temperature gradient, improve the uniformity of internal temperature distribution, reduce uneven current distribution, and ensure the battery's lifespan and safety.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A single battery is provided, including a casing, a battery cell, and a battery top cover. The battery cell is disposed in the casing, the terminal post is electrically connected to the battery cell, and the cover plate is closedly connected to the casing.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a battery top cover, including terminals, a heat-conducting sheet, and a cover plate. The heat-conducting sheet includes a sleeve portion and an extension portion. The sleeve portion is sleeved on and abuts against the terminals, isolating the terminals from the cover plate. This allows heat from the terminals to be directly transferred to the sleeve portion during charging and discharging, preventing heat from the terminals from being dissipated layer by layer from the battery interior to the battery casing. This shortens the heat transfer path, reduces the battery's thermal resistance, and accelerates the heat dissipation of the terminals. Furthermore, the extension portion extends away from the terminals, increasing the surface area of ​​the heat-conducting sheet. Heat is transferred from the sleeve portion to the extension portion, further improving the heat dissipation efficiency of the heat-conducting sheet. This, in turn, improves the uniformity of temperature distribution inside the battery, ensuring good battery performance and safety, and extending the battery's lifespan.

[0024] This invention also provides a single-cell battery in which the terminals can dissipate heat directly to the outside of the battery through a heat-conducting sheet, reducing the thermal resistance of the terminals, lowering the temperature gradient inside the battery, and forming a more uniform temperature distribution inside the battery. This reduces the problem of uneven current distribution, helps to slow down the battery's lifespan degradation during cyclic charging and discharging, and extends the battery's service life. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the battery top cover provided by this utility model;

[0026] Figure 2 This is an exploded view of the battery top cover provided by this utility model.

[0027] In the picture:

[0028] 100. Cover plate; 110. Limiting groove; 120. Explosion-proof hole;

[0029] 200, pole post; 210, upper pole post; 220, through-hole section; 230, lower pole post;

[0030] 300. Heat-conducting plate; 310. Sleeve fitting; 320. Extension part;

[0031] 400. Heat sink; 410. Protrusion;

[0032] 500. Upper insulation component;

[0033] 600. Lower insulation component;

[0034] 700, sealing ring;

[0035] 800. Explosion-proof structure; 810. Explosion-proof valve; 820. Protective membrane. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] like Figures 1 to 2 As shown, the battery top cover of this embodiment includes a cover plate 100, a terminal post 200, and a heat-conducting sheet 300. The terminal post 200 includes an upper terminal post 210 and a through portion 220. The upper terminal post 210 is connected above the through portion 220 and is located above the cover plate 100. The through portion 220 passes through the cover plate 100. The heat-conducting sheet 300 includes a sleeve portion 310 and an extension portion 320. The extension portion 320 is connected above the sleeve portion 310. The sleeve portion 310 is disposed between the cover plate 100 and the through portion 220 and abuts against the through portion 220. The extension portion 320 is disposed between the upper terminal post 210 and the cover plate 100.

[0041] Based on the above design, the sleeve portion 310 in the battery top cover provided in this embodiment is sleeved on and abuts against the terminal post 200, isolating the terminal post 200 from the cover plate 100. This allows the heat on the terminal post 200 to be directly transferred to the sleeve portion 310 during charging and discharging, preventing the heat on the terminal post 200 from being transferred layer by layer from the battery interior to the battery casing. This shortens the heat transfer path on the terminal post 200, reduces the thermal resistance of the battery, and thus accelerates the heat dissipation speed of the terminal post 200. In addition, the extension portion 320 can extend away from the terminal post 200, which can increase the surface area of ​​the heat-conducting sheet 300, allowing heat to be transferred from the sleeve portion 310 to the extension portion 320, further improving the heat dissipation efficiency of the heat-conducting sheet 300, thereby improving the uniformity of the internal temperature distribution of the battery, ensuring good battery performance and safety, and extending the battery's service life.

[0042] In this embodiment, the heat-conducting sheet 300 is an aluminum nitride ceramic sheet. Aluminum nitride ceramic sheets have a high thermal conductivity, achieving excellent heat conduction; they also possess good stability, are resistant to high temperatures and chemical corrosion, and have a long service life; they have a low coefficient of expansion, high strength, and strong resistance to deformation, reducing the risk of deformation after prolonged use; furthermore, they have high resistivity and low dielectric loss, providing good insulation and preventing short circuits between the electrode post 200 and the cover plate 100. In some other embodiments, the heat-conducting sheet 300 can also be made of alumina, boron nitride, silicone rubber, magnesium oxide, etc., which will not be elaborated further here.

[0043] Optionally, a limiting groove 110 is provided on the upper surface of the cover plate 100, and the extension 320 is limited within the limiting groove 110. The upper surface of the extension 320 is flush with the upper surface of the cover plate 100. This can not only achieve the positioning of the heat-conducting sheet 300 on the cover plate 100, but also avoid increasing the volume of the battery top cover, thus occupying more installation space and improving the space utilization of the battery.

[0044] Furthermore, the battery top cover also includes a heat sink 400, which is sleeved on the upper terminal post 210 and abuts against the upper surface of the extension 320. The heat sink 400 can be connected to the battery thermal management system to monitor the battery temperature in real time. The thermal management system can cool or heat the heat sink 400 to ensure that the battery always operates within the optimal operating temperature range, thereby improving the battery's efficiency and performance.

[0045] Optionally, the heat sink 400 has a plurality of protrusions 410 on the side facing the extension 320. The protrusions 410 abut against the extension 320, and the protrusions 410 are spaced apart from each other. While ensuring the heat conduction efficiency between the heat sink 400 and the extension 320, it also ensures that the upper surface of the extension 320 can be in full contact with the air, thereby ensuring the heat conduction efficiency between the air and the extension 320.

[0046] Furthermore, the battery top cover also includes an upper insulating member 500, which is located above the heat-conducting sheet 300 and covers the bottom surface and side wall of the upper electrode post 210, thereby achieving insulation between the upper electrode post 210 and the extension 320.

[0047] Furthermore, the terminal post 200 also includes a lower terminal post 230, which is connected to the through portion 220 and located below the cover plate 100. The battery top cover also includes a lower insulating member 600, which is disposed between the lower terminal post 230 and the cover plate 100 to ensure insulation between the battery interior and the cover plate 100.

[0048] Optionally, the battery top cover also includes a sealing ring 700, which is sleeved on the terminal post 200 and located between the terminal post 200 and the lower insulating member 600 to ensure that the battery top cover has good sealing performance.

[0049] Furthermore, the cover plate 100 is provided with an explosion-proof hole 120, and the battery top cover also includes an explosion-proof structure 800, which covers the explosion-proof hole 120 and is connected to the cover plate 100. When the internal gas pressure of the battery is too high, the high-pressure gas flows into the explosion-proof hole 120, and the explosion-proof structure 800 can rupture under the action of the high-pressure gas, thereby releasing the high-pressure gas, realizing the venting of the battery interior, and ensuring the safety of the battery structure.

[0050] Specifically, the explosion-proof structure 800 includes an explosion-proof valve 810 and a protective membrane 820. The explosion-proof valve 810 covers the explosion-proof hole 120 and is connected to the lower surface of the cover plate 100. The explosion-proof valve 810 has grooves with a small thickness at the grooves, which can rupture under the action of high-pressure gas, thereby releasing the high-pressure gas. The protective membrane 820 covers the explosion-proof hole 120 and is connected to the upper surface of the cover plate 100 to prevent foreign objects from bumping or scratching the explosion-proof valve 810 during battery top cover assembly or use, ensuring that the explosion-proof valve 810 functions properly.

[0051] This embodiment also provides a single battery cell, including a casing, a battery cell, and the aforementioned battery top cover. The battery cell is disposed in the casing, and the terminal post 200 is electrically connected to the battery cell. The cover plate 100 is sealed to the casing. The terminal post 200 of this single battery cell can dissipate heat directly to the outside of the single battery cell through the heat-conducting plate 300. Compared with the case where the terminal post 200 dissipates heat to the outside of the battery cell through the battery cell and casing, it can reduce the thermal resistance of heat dissipation of the terminal post 200, reduce the temperature gradient inside the battery, and form a more uniform temperature distribution inside the battery. This reduces the problem of uneven current distribution, helps to slow down the battery's lifespan degradation during charge-discharge cycles, and extends the battery's service life.

[0052] 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 battery top cover, characterized in that, include: Cover plate (100); The pole (200) includes an upper pole (210) and a through part (220), the upper pole (210) being located above the cover plate (100), and the through part (220) passing through the cover plate (100); A heat-conducting sheet (300) includes a sleeve portion (310) and an extension portion (320). The sleeve portion (310) is disposed between the cover plate (100) and the through portion (220) and abuts against the through portion (220). The extension portion (320) is disposed between the upper pole post (210) and the cover plate (100).

2. The battery top cover according to claim 1, characterized in that, The battery top cover also includes a heat sink (400), which is sleeved on the upper pole (210) and abuts against the upper surface of the extension (320).

3. The battery top cover according to claim 2, characterized in that, The heat sink (400) has a plurality of protrusions (410) on the side facing the extension (320), and the protrusions (410) abut against the extension (320).

4. The battery top cover according to claim 1, characterized in that, The heat-conducting sheet (300) is configured as an aluminum nitride ceramic sheet.

5. The battery top cover according to claim 1, characterized in that, The upper surface of the cover plate (100) is provided with a limiting groove (110), and the extension (320) is limited within the limiting groove (110).

6. The battery top cover according to claim 1, characterized in that, The battery top cover also includes an upper insulating member (500), which is located above the heat-conducting sheet (300) and covers the bottom surface and side wall of the upper pole post (210).

7. The battery top cover according to claim 1, characterized in that, The terminal post (200) further includes a lower terminal post (230), which is connected to the through portion (220) and located below the cover plate (100). The battery top cover also includes a lower insulating member (600), which is disposed between the lower terminal post (230) and the cover plate (100).

8. The battery top cover according to claim 7, characterized in that, The battery top cover also includes a sealing ring (700), which is sleeved on the terminal post (200) and located between the terminal post (200) and the lower insulating member (600).

9. The battery top cover according to claim 1, characterized in that, The cover plate (100) is provided with an explosion-proof hole (120), and the battery top cover also includes an explosion-proof structure (800), which covers the explosion-proof hole (120) and is connected to the cover plate (100).

10. A single-cell battery, characterized in that, The battery includes a housing, a battery cell, and a battery top cover as described in any one of claims 1-9, wherein the battery cell is disposed in the housing, the terminal post (200) is electrically connected to the battery cell, and the cover plate (100) is closedly connected to the housing.

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