Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer. The battery top cover comprises a top cover sheet, upper plastic, lower plastic, a pole and a sealing ring, a first mounting hole is formed in the top cover piece, the upper plastic is tightly attached to one side of the top cover piece, a first air channel is formed in the side wall of the upper plastic, a second air channel is formed in the contact range of the upper plastic and the top cover piece, a second mounting hole is formed in the lower plastic, and the lower plastic is located on one side of the top cover piece. The pole sequentially penetrates through the second mounting hole and the first mounting hole and is riveted with the pressing block in the upper plastic; first gaps are reserved between the pole and the first mounting hole and between the pole and the second mounting hole; a third air passage is arranged between the pole and the lower plastic, the first air passage, the second air passage, the first gap, the third air passage and the interior of the battery are sequentially communicated, and the first air passage is communicated with the outside. The sealing ring sleeves the pole and can seal the first gap. The battery top cover can prevent neglected loading of the sealing ring; and the electrolyte can be prevented from corroding the top cover of the 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 battery cell. Background Technology

[0002] Typically, a battery top cover includes components such as an aluminum sheet, upper plastic, lower plastic, a sealing ring, and terminals. These components are joined together using riveting or other processes, ensuring a tight fit under the riveting force and guaranteeing the battery top cover's sealing performance. Even if the sealing ring is missing, this type of battery top cover can still maintain a certain level of sealing due to the compression and deformation of the upper and lower plastics, allowing the battery to pass helium emission testing. However, in actual use, if the relative positions of the terminals and the aluminum sheet change, the unstable (temporary) seal formed by the upper and lower plastics may fail, leading to battery leakage.

[0003] Therefore, there is an urgent need to propose a battery top cover and a battery cell to solve the above problems. Utility Model Content

[0004] The first objective of this invention is to provide a battery top cover that can prevent the sealing ring from being missing, thereby improving the battery yield rate; it can also prevent electrolyte overflowing onto the top cover sheet during battery filling from flowing into the second air passage, thus avoiding corrosion of the battery top cover.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Battery top cover, including:

[0007] Top cover plate, wherein the top cover plate is provided with a first mounting hole;

[0008] The upper plastic is attached to the side of the top cover sheet away from the battery cell. The upper plastic has a first air channel on its side wall and a second air channel within the contact area between the upper plastic and the top cover sheet.

[0009] The lower plastic sheet has a second mounting hole and is located on the side of the top cover sheet facing the battery cell.

[0010] The electrode post is sequentially passed through the second mounting hole and the first mounting hole and riveted to the pressure block inside the upper plastic. A first gap is left between the electrode post and the first mounting hole and the second mounting hole. A third air channel is provided between the electrode post and the lower plastic. The first air channel, the second air channel, the first gap, the third air channel and the inside of the battery are sequentially connected, and the first air channel is connected to the outside.

[0011] A sealing ring is fitted onto the pole post and is capable of sealing the first gap.

[0012] As an optional technical solution for the battery top cover, a first venting groove is provided on the inner sidewall of the upper plastic, and a first air passage is defined between the first venting groove and the outer sidewall of the pressure block.

[0013] As an optional technical solution for the battery top cover, the top cover sheet is provided with a second venting groove on the side facing the upper plastic. The first venting groove penetrates the bottom wall of the upper plastic and communicates with the second venting groove. The second venting groove and the upper plastic define a second air passage.

[0014] As an optional technical solution for the battery top cover, there are multiple first venting slots and multiple second venting slots, with each second venting slot corresponding to one of the first venting slots, and the multiple second venting slots are evenly spaced along the outer circumference of the first mounting hole.

[0015] As an optional technical solution for the battery top cover, multiple protrusions are provided along the circumferential direction of the inner sidewall of the upper plastic, and the first venting groove is defined between two adjacent protrusions.

[0016] As an optional technical solution for the battery top cover, along the thickness direction of the top cover sheet, the height of the boss is lower than the height of the side wall of the upper plastic, and the pressure block is mounted on the boss.

[0017] As an optional technical solution for the battery top cover, the terminal post includes a column and a base. The column is connected to the base. The column passes through the second mounting hole and the first mounting hole. The base abuts against the lower plastic. The third air passage is located between the base and the lower plastic.

[0018] As an optional technical solution for the battery top cover, the lower plastic is provided with a third exhaust groove on the side facing the chassis, and the third exhaust groove and the chassis define the third air passage.

[0019] As an optional technical solution for the battery top cover, the sealing ring includes a first sealing part and a second sealing part that are connected to each other. The first sealing part is sandwiched between the hole wall of the first mounting hole and the side wall of the column, and the second sealing part is located in the second mounting hole and sandwiched between the top cover plate and the chassis.

[0020] The second objective of this invention is to provide a battery cell with high yield and high safety.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] A battery cell includes a battery cell, a battery casing, and a top cover. The battery cell is located inside the battery casing, and the top cover is disposed over the opening of the battery casing.

[0023] The beneficial effects of this utility model are:

[0024] The battery top cover provided by this utility model includes a top cover sheet, an upper plastic, a lower plastic, terminals, and a sealing ring. The upper plastic is tightly attached to the top cover sheet, and the lower plastic is located on one side of the top cover sheet. The terminals are riveted to a pressure block inside the upper plastic. A first air channel is provided on the side wall of the upper plastic, and a second air channel is provided within the contact area between the upper plastic and the top cover sheet. A first gap is left between the terminals and both the first and second mounting holes. A third air channel is provided between the terminals and the lower plastic. The first air channel, the second air channel, the first gap, the third air channel, and the battery interior are sequentially connected, and the first air channel is connected to the outside. The sealing ring is fitted onto the terminals and can seal the first gap. During actual assembly, due to the riveting action of the terminals and the pressure block, the upper plastic, the pressure block, the top cover sheet, and the lower plastic are tightly fitted at the joint to form a seal. The sealing ring can seal the first gap, ensuring the sealing performance of the battery top cover. If the sealing ring is omitted during actual assembly, although the upper plastic, pressure block, top cover, and lower plastic are tightly fitted at the joints to form a seal, external gas can still enter the battery through the first air passage, second air passage, first gap, and third channel because the first gap is not blocked by the sealing ring. This will prevent the battery from passing the helium test, thus preventing the sealing ring from being omitted and improving the battery yield. Furthermore, since the first air passage is located on the side wall of the upper plastic and the second air passage is located within the contact area between the upper plastic and the top cover, neither the first nor the second air passage exceeds the projection range of the upper plastic on the top cover. The upper plastic is also tightly fitted to the top cover, preventing electrolyte overflowing onto the top cover during battery filling from flowing into the second air passage and thus avoiding corrosion of the battery top cover. Attached Figure Description

[0025] Figure 1 This is a partial cross-sectional view of the battery top cover provided in an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the upper plastic provided in this embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the top cover sheet provided in this embodiment of the utility model;

[0028] Figure 4 This is a partial structural diagram of the lower plastic provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the pole structure provided in an embodiment of the present invention;

[0030] Figure 6This is a schematic diagram of the sealing ring provided in an embodiment of the present invention.

[0031] In the picture:

[0032] 100. Top cover plate; 110. First mounting hole; 120. Second exhaust groove; 101. Second air passage; 200. Upper plastic; 210. First exhaust groove; 220. Boss; 201. First air passage; 300. Lower plastic; 310. Second mounting hole; 320. Third exhaust groove; 301. Third air passage; 400. End post; 410. Post body; 420. Chassis; 500. Sealing ring; 510. First sealing part; 520. Second sealing part; 600. Pressure block. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] This embodiment provides a battery top cover that can prevent the sealing ring from being missing, thereby improving the battery yield rate; it can also prevent electrolyte overflowing onto the top cover sheet during battery filling from flowing into the second air channel, thus avoiding corrosion of the battery top cover.

[0038] Specifically, such as Figures 1 to 4 As shown, the battery top cover includes a top cover sheet 100, an upper plastic sheet 200, a lower plastic sheet 300, a terminal post 400, and a sealing ring 500. Typically, the top cover sheet 100 is a plain aluminum sheet, and it has a first mounting hole 110. The upper plastic sheet 200 has a groove structure, with its outer bottom wall tightly attached to the side of the top cover sheet 100 facing away from the battery cell. A first air passage 201 is provided on the side wall of the upper plastic sheet 200, and a second air passage 101 is provided within the contact area between the upper plastic sheet 200 and the top cover sheet 100. That is, the second air passage 101 does not extend beyond the edge of the groove bottom wall of the upper plastic sheet 200, and is located within the orthographic projection range of the upper plastic sheet 200 onto the top cover sheet 100. The lower plastic sheet 300 has a second mounting hole 310 and is located on the side of the top cover sheet 100 facing the battery cell. The terminal post 400 passes through the second mounting hole 310 and the first mounting hole 110 in sequence and is riveted to the pressure block 600 inside the upper plastic 200. A first gap is left between the terminal post 400 and the first mounting hole 110 and the second mounting hole 310. A third air passage 301 is provided between the terminal post 400 and the lower plastic 300. The first air passage 201, the second air passage 101, the first gap, the third air passage 301 and the inside of the battery are sequentially connected, and the first air passage 201 is connected to the outside. A sealing ring 500 is fitted onto the terminal post 400 and can seal the first gap.

[0039] Based on the above design, the upper plastic 200 is tightly attached to the top cover plate 100, the lower plastic 300 is located on one side of the top cover plate 100, and the terminal post 400 is riveted to the pressure block 600 inside the upper plastic 200; a first air passage 201 is provided on the side wall of the upper plastic 200, a second air passage 101 is provided within the contact area between the upper plastic 200 and the top cover plate 100, a first gap is left between the terminal post 400 and the first mounting hole 110 and the second mounting hole 310, and a third air passage 301 is provided between the terminal post 400 and the lower plastic 300. The first air passage 201, the second air passage 101, the first gap, the third air passage 301 and the inside of the battery are connected in sequence, and the first air passage 201 is connected to the outside. The sealing ring 500 is sleeved on the terminal post 400 and can seal the first gap. During actual assembly, the riveting action between the terminal post 400 and the pressure block 600 ensures that the upper plastic 200, pressure block 600, top cover plate 100, and lower plastic 300 are tightly fitted together at the connection point to form a seal. The sealing ring 500 can seal the first gap, ensuring the sealing performance of the battery top cover. If the sealing ring 500 is omitted during actual assembly, although the upper plastic 200, pressure block 600, top cover plate 100, and lower plastic 300 are tightly fitted together at the connection point to form a seal, external gas can still enter the battery through the first gas channel 201, the second gas channel 101, the first gap, and the third channel because the first gap is not sealed by the sealing ring 500. This will prevent the battery from passing the helium test, thus preventing the sealing ring 500 from being omitted and improving the battery yield. In addition, since the first air passage 201 is located on the side wall of the upper plastic 200 and the second air passage 101 is located within the contact range between the upper plastic 200 and the top cover plate 100, that is, neither the first air passage 201 nor the second air passage 101 will exceed the projection range of the upper plastic 200 on the top cover plate 100. The upper plastic 200 is also in close contact with the top cover plate 100, which can prevent the electrolyte that overflows onto the top cover plate 100 during battery filling from flowing into the second air passage 101, so as to avoid corrosion of the battery top cover.

[0040] Optionally, continue as follows Figure 2 As shown, a first venting groove 210 is provided on the inner sidewall of the upper plastic 200, and a first air passage 201 is defined between the first venting groove 210 and the outer sidewall of the pressure block 600. By placing the first venting groove 210 on the inner sidewall of the upper plastic 200, the connection between the first air passage 201 and the second air passage 101 is prevented from being exposed outside the upper plastic 200, thereby preventing electrolyte overflowing onto the top cover plate 100 during battery filling from flowing into the second air passage 101; and the first air passage 201 defined between the first venting groove 210 and the outer sidewall of the pressure block 600 allows gas to enter and exit only at the first air passage 201, while other parts of the inner sidewall of the upper plastic 200 (except for the first venting groove 210) are in close contact with the sidewall of the pressure block 600 to ensure the sealing performance of the battery top cover.

[0041] Furthermore, continue as Figure 3As shown, the top cover 100 has a second venting groove 120 on the side facing the upper plastic 200. The first venting groove 210 penetrates the bottom wall of the upper plastic 200 and communicates with the second venting groove 120 to prevent the connection between the first venting groove 210 and the second venting groove 120 from being exposed outside the upper plastic 200. The second venting groove 120 and the upper plastic 200 define a second air passage 101 to prevent air leakage from the second air passage 101.

[0042] In order to shorten the gas flow, the first exhaust groove 210 is a strip-shaped groove extending through the thickness of the top cover plate 100; the second exhaust groove 120 is a strip-shaped groove extending radially from the edge of the first mounting hole 110 (through the first mounting hole 110) toward the direction away from the first mounting hole 110 to the first exhaust groove 210.

[0043] Optionally, there are multiple first venting grooves 210 and multiple second venting grooves 120. Each second venting groove 120 corresponds to a first venting groove 210. Multiple second venting grooves 120 are evenly spaced along the outer periphery of the first mounting hole 110 to improve the visibility of the result indicating the missing sealing ring 500 during battery helium testing.

[0044] In this embodiment, the pole post 400 is a pseudo-cylinder 410, the upper plastic 200 is a pseudo-cubic prism, and there are four first exhaust grooves 210 and four second exhaust grooves 120. The four first exhaust grooves 210 are respectively located on the four side walls of the upper plastic 200 and extend along the thickness direction of the top cover plate 100. Two of the second exhaust grooves 120 extend along the length direction of the top cover plate 100, and the other two second exhaust grooves 120 extend along the width direction of the top cover plate 100.

[0045] It should be noted that there are locking posts and locking slots between the upper plastic 200 and the top cover plate 100, and the locking posts and locking slots are set to avoid the second exhaust slot 120.

[0046] To increase the sidewall thickness of the upper plastic 200, continue as follows Figure 1 and Figure 2 As shown, a plurality of protrusions 220 are provided along the circumferential direction of the inner sidewall of the upper plastic 200, and a first venting groove 210 is defined between two adjacent protrusions 220, thereby improving the sealing performance of the upper plastic 200.

[0047] Furthermore, along the thickness direction of the top cover sheet 100, the height of the boss 220 is lower than the side wall height of the upper plastic 200, and the pressure block 600 is placed on the boss 220 to achieve the riveting of the outer side wall of the pressure block 600 and the upper plastic 200, thereby improving the sealing performance of the battery top cover.

[0048] It should be noted that there is a second gap between the inner wall of the upper plastic 200 outside the boss 220 and the outer wall of the pressure block 600, through which external gas can enter the first air passage 201.

[0049] like Figure 1 and Figure 5 As shown, the pole post 400 includes a pole body 410 and a base plate 420. The pole body 410 is connected to the base plate 420. The pole body 410 has a second mounting hole 310 and a first mounting hole 110. The base plate 420 abuts against the lower plastic 300. The third air passage 301 is located between the base plate 420 and the lower plastic 300 to ensure the sealing of the connection between the pole post 400 and the lower plastic 300.

[0050] Optionally, continue as follows Figure 4 As shown, a third vent groove 320 is provided on the side of the lower plastic 300 facing the chassis 420. The third vent groove 320 and the chassis 420 define a third air passage 301 to ensure the sealing performance of the third air passage 301.

[0051] The number of third exhaust grooves 320 can be multiple, for example, two, three, four or six. In this embodiment, the number of third exhaust grooves 320 is four, and the multiple third exhaust grooves 320 are evenly spaced along the outer periphery of the second mounting hole 310.

[0052] In this embodiment, an annular groove is provided on the lower plastic 300 along the outer periphery of the second mounting hole 310, and the chassis 420 is located in the annular groove, which increases the sealing between the chassis 420 and the lower plastic 300.

[0053] It should be noted that the third exhaust groove 320 is located at the bottom of the annular groove, and a third gap is left between the outer periphery of the chassis 420 and the inner wall of the annular groove, which allows the gas in the third exhaust groove 320 to enter the battery through the third gap.

[0054] To shorten the gas flow, the third exhaust groove 320 is a strip-shaped groove extending radially from the edge of the second mounting hole 310 (through the second mounting hole 310) toward the inner wall of the annular groove.

[0055] Optionally, such as Figure 6 As shown, the sealing ring 500 includes a first sealing part 510 and a second sealing part 520 connected to each other. The first sealing part 510 is sandwiched between the hole wall of the first mounting hole 110 and the side wall of the column 410. The second sealing part 520 is located in the second mounting hole 310 and sandwiched between the top cover plate 100 and the chassis 420 to seal the entire first gap.

[0056] In this embodiment, the battery top cover includes two terminals 400, two upper plastic parts 200, two pressing blocks 600, and two sealing rings 500. One terminal 400 is a positive terminal, and the other is a negative terminal. The top cover plate 100 has two first mounting holes 110, and the lower plastic part 300 has two second mounting holes 310. The first mounting holes 110 and the second mounting holes 310 correspond one-to-one, and both the first mounting holes 110 and the second mounting holes 310 correspond one-to-one with the terminals 400. The assembly methods of the positive and negative terminals can be the same or different, which will not be described in detail here.

[0057] Furthermore, two first mounting holes 110 are spaced apart along the length of the top cover plate 100, an explosion-proof valve is located between the two first mounting holes 110, and an injection hole is located between the first mounting hole 110 where the positive electrode post 400 is located and the explosion-proof valve.

[0058] This embodiment also provides a battery cell with high yield and high safety.

[0059] Specifically, the battery cell includes a battery cell, a battery casing, and a battery top cover. The battery cell is located inside the battery casing, and the top cover 100 covers the opening of the battery casing. Because the battery top cover prevents the sealing ring 500 from being missing, it improves the yield rate of the battery cell. It also prevents electrolyte overflowing onto the top cover 100 during battery cell filling from flowing into the second vent 101, thus avoiding corrosion of the battery top cover and improving the safety performance of the battery cell.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments 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: A top cover plate (100) is provided with a first mounting hole (110); The upper plastic (200) is closely attached to the side of the top cover (100) away from the battery cell. A first air channel (201) is provided on the side wall of the upper plastic (200), and a second air channel (101) is provided within the contact area between the upper plastic (200) and the top cover (100). The lower plastic (300) is provided with a second mounting hole (310), and the lower plastic (300) is located on the side of the top cover (100) facing the battery cell; A terminal post (400) is sequentially passed through the second mounting hole (310) and the first mounting hole (110) and riveted to the pressure block (600) inside the upper plastic (200). A first gap is left between the terminal post (400) and the first mounting hole (110) and the second mounting hole (310). A third air passage (301) is provided between the terminal post (400) and the lower plastic (300). The first air passage (201), the second air passage (101), the first gap, the third air passage (301) and the inside of the battery are sequentially connected, and the first air passage (201) is connected to the outside. A sealing ring (500) is fitted onto the pole post (400) and is capable of sealing the first gap.

2. The battery top cover according to claim 1, characterized in that, A first venting groove (210) is provided on the inner sidewall of the upper plastic (200), and a first air passage (201) is defined between the first venting groove (210) and the outer sidewall of the pressure block (600).

3. The battery top cover according to claim 2, characterized in that, The top cover (100) has a second exhaust groove (120) on the side facing the upper plastic (200). The first exhaust groove (210) penetrates the bottom wall of the upper plastic (200) and communicates with the second exhaust groove (120). The second exhaust groove (120) and the upper plastic (200) define a second air passage (101).

4. The battery top cover according to claim 3, characterized in that, There are multiple first exhaust grooves (210) and multiple second exhaust grooves (120). The second exhaust grooves (120) correspond one-to-one with the first exhaust grooves (210). The multiple second exhaust grooves (120) are evenly spaced along the outer periphery of the first mounting hole (110).

5. The battery top cover according to claim 4, characterized in that, A plurality of protrusions (220) are provided along the circumferential direction of the inner sidewall of the upper plastic (200), and the first venting groove (210) is defined between two adjacent protrusions (220).

6. The battery top cover according to claim 5, characterized in that, Along the thickness direction of the top cover (100), the height of the boss (220) is lower than the side wall height of the upper plastic (200), and the pressure block (600) is placed on the boss (220).

7. The battery top cover according to claim 1, characterized in that, The pole post (400) includes a column (410) and a base (420). The column (410) is connected to the base (420). The column (410) passes through the second mounting hole (310) and the first mounting hole (110). The base (420) abuts against the lower plastic (300). The third air passage (301) is located between the base (420) and the lower plastic (300).

8. The battery top cover according to claim 7, characterized in that, The lower plastic (300) has a third exhaust groove (320) on the side facing the chassis (420), and the third exhaust groove (320) and the chassis (420) define the third air passage (301).

9. The battery top cover according to claim 7, characterized in that, The sealing ring (500) includes a first sealing part (510) and a second sealing part (520) connected to each other. The first sealing part (510) is sandwiched between the hole wall of the first mounting hole (110) and the side wall of the column (410). The second sealing part (520) is located in the second mounting hole (310) and sandwiched between the top cover plate (100) and the chassis (420).

10. A single battery cell, characterized in that, The battery includes a battery cell, a battery casing, and a battery top cover as described in any one of claims 1-9, wherein the battery cell is located inside the battery casing, and the top cover (100) is disposed over the opening of the battery casing.

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