Cover plate assembly, battery cell and battery

Abstract

The utility model relates to a battery field provides a kind of cover plate assembly, electric core and battery.Cover plate assembly includes cover plate body, is provided with explosion vent on cover plate body, explosion vent is provided with explosion-proof patch on the side of cover plate body, and opening is set up in explosion-proof patch.The explosion-proof patch in the cover plate assembly can block impurities and particles, prevent them from entering the inside of explosion vent, ensure the normal work of explosion vent.In extreme case, explosion vent opens and releases pressure, and explosion-proof patch can also slow down the release speed of gas to a certain extent, reduce the secondary injury that may be caused by high-speed ejection of gas, such as impact and damage to surrounding equipment.Explosion-proof patch can also prevent the direct leakage of chemical substances in the battery to the outside environment, and play a certain environmental protection effect.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a cover plate assembly, a battery cell, and a battery. Background Technology

[0002] Lithium-ion batteries have become the representative of modern high-performance batteries due to their advantages such as high operating voltage, high specific energy, large capacity, low self-discharge, good cycle performance, long service life, light weight, and small size.

[0003] An explosion-proof valve is integrated into the cover plate to facilitate the directional discharge of high-temperature and high-pressure gas inside the battery when thermal runaway occurs due to an internal short circuit, thereby improving battery safety performance.

[0004] However, in actual use, explosion-proof valves may be contaminated, leading to a decrease in their venting performance and thus affecting the safety performance of the cells and batteries. Utility Model Content

[0005] This utility model provides a cover plate assembly to address the defect in related technologies where explosion-proof valves are at risk of contamination.

[0006] This utility model embodiment also provides a battery cell.

[0007] This utility model embodiment also provides a battery.

[0008] The first aspect of this utility model provides a cover plate assembly, including a cover plate body, an explosion-proof valve is provided on the cover plate body, an explosion-proof patch is provided on the side of the explosion-proof valve opposite to the cover plate body, and an opening is provided on the explosion-proof patch.

[0009] According to one embodiment of the present invention, there are multiple openings, and adjacent openings are spaced apart.

[0010] According to one embodiment of the present invention, the plurality of openings are arranged in a ring, and the openings include two sets of straight hole groups arranged opposite each other and arc-shaped hole groups located at both ends of the two sets of straight hole groups. The minimum distance between the two sets of straight hole groups is less than or equal to the distance between the two rows of grooves in the explosion-proof valve.

[0011] According to one embodiment of the present invention, the length of the explosion-proof patch is less than the length of the explosion-proof valve along the length direction of the explosion-proof valve.

[0012] According to one embodiment of the present invention, half of the difference between the length of the explosion-proof patch and the length of the explosion-proof valve ranges from 0.5 mm to 5 mm.

[0013] According to one embodiment of the present invention, the width of the opening ranges from 0.05 mm to 0.2 mm.

[0014] According to one embodiment of the present invention, a soldering station is formed on the explosion-proof valve along the length direction of the explosion-proof patch, and a portion of the edge of the explosion-proof patch overlaps the soldering station.

[0015] According to one embodiment of the present invention, along the length direction of the explosion-proof patch, the value of the overlapping portion of a portion of the edge of the explosion-proof patch with the soldering station ranges from 0.5 mm to 2 mm.

[0016] A second aspect of this utility model provides a battery cell, including a housing and a cover plate assembly as described above, the cover plate assembly being disposed on the housing.

[0017] A third aspect of this utility model provides a battery, including the cover assembly as described above, or the battery cell as described above.

[0018] According to the cover assembly provided in the first aspect of this utility model, the explosion-proof patch can block impurities and particles, preventing them from entering the explosion-proof valve and ensuring its normal operation. In extreme cases, when the explosion-proof valve opens to release pressure, the explosion-proof patch can also slow down the gas release rate to a certain extent, reducing secondary damage that may be caused by high-speed gas ejection, such as impact and damage to surrounding equipment. In addition, the explosion-proof patch can also prevent the chemical substances inside the battery from directly leaking into the external environment, playing a certain environmental protection role. The overall structural design of the cover assembly allows the various components to cooperate and protect each other. The cover body provides stable support for the explosion-proof valve and the explosion-proof patch, and the explosion-proof patch and the explosion-proof valve work together to improve the reliability and service life of the entire cover assembly, reducing product replacement and maintenance costs caused by battery failure.

[0019] According to the second aspect of the present invention, when the internal pressure of the battery cell rises sharply due to short circuits, overcharging, or other reasons, the explosion-proof valve and explosion-proof patch on the cover assembly work together to release the pressure in a timely manner, preventing serious safety accidents such as battery cell explosion or fire, and effectively protecting the safety of equipment and personnel using the battery cell. The tight connection between the housing and the cover assembly prevents electrolyte leakage, which not only ensures the normal performance of the battery cell but also avoids corrosion and damage to the surrounding environment and equipment by the electrolyte. At the same time, good sealing also prevents external moisture and air from entering the battery cell, preventing the electrode materials from being oxidized or damp, thereby extending the service life and stability of the battery cell.

[0020] According to the battery provided in the third aspect embodiment of this utility model, the explosion-proof design of the cover assembly greatly improves the battery's safety performance. When abnormal conditions such as overcharging or short circuits occur inside the battery, causing pressure to rise, the explosion-proof valve and explosion-proof patch work together to release pressure in a timely manner, preventing the battery from exploding or catching fire, effectively protecting the safety of users and equipment. The openings on the explosion-proof patch allow gas to escape while blocking dust, impurities, etc., from entering the battery, preventing damage to the battery's internal structure and performance, and extending the battery's service life. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic exploded view of the cover plate assembly provided by this utility model.

[0023] Figure 2 This is a schematic top view of the cover plate assembly provided by this utility model.

[0024] Figure 3 yes Figure 2 A schematic cross-sectional view along the AA direction.

[0025] Figure 4 This is a schematic exploded view of the explosion-proof valve and explosion-proof patch provided by this utility model.

[0026] Figure 5 This is a schematic top view of the explosion-proof valve and explosion-proof patch provided by this utility model.

[0027] Figure label:

[0028] 100. Cover plate body; 102. Explosion-proof valve; 104. Explosion-proof patch; 106. Opening; 108. Welding station. Detailed Implementation

[0029] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0030] like Figures 1 to 5As shown, the first aspect of this utility model provides a cover plate assembly, including a cover plate body 100, an explosion-proof valve 102 is provided on the cover plate body 100, an explosion-proof patch 104 is provided on the side of the explosion-proof valve 102 away from the cover plate body 100, and an opening 106 is provided on the explosion-proof patch 104.

[0031] According to the cover assembly provided in the first aspect of this utility model, the explosion-proof patch 104 can block impurities and particles, preventing them from entering the explosion-proof valve 102 and ensuring the normal operation of the explosion-proof valve 102. In extreme cases, when the explosion-proof valve 102 opens to release pressure, the explosion-proof patch 104 can also slow down the gas release rate to a certain extent, reducing secondary damage that may be caused by high-speed gas ejection, such as impact and damage to surrounding equipment. In addition, the explosion-proof patch 104 can also prevent the chemical substances inside the battery from directly leaking into the external environment, playing a certain environmental protection role. The overall structural design of the cover assembly allows the various components to cooperate and protect each other. The cover body 100 provides stable support for the explosion-proof valve 102 and the explosion-proof patch 104, and the explosion-proof patch 104 and the explosion-proof valve 102 work together to improve the reliability and service life of the entire cover assembly and reduce the product replacement and maintenance costs caused by battery failure.

[0032] Please continue reading Figures 1 to 5 In this cover assembly, the cover body 100 serves as the fundamental support structure for the entire assembly. It is typically made of a metal material with sufficient strength and corrosion resistance to withstand certain pressures and environmental influences during battery use. An explosion-proof valve 102 is precisely positioned on the cover body 100. Its function is to open promptly when the internal pressure of the battery abnormally increases, releasing pressure and preventing dangerous situations such as battery explosion. The explosion-proof valve 102 is designed to fit tightly with the cover body 100 and is installed using appropriate processes to ensure sealing and connection stability between the two.

[0033] The explosion-proof patch 104 is located on the side of the explosion-proof valve 102 away from the cover plate body 100. The explosion-proof patch 104 is made of a flexible material with a certain strength, such as a plastic film or metal foil with chemical corrosion resistance. The opening 106 on the explosion-proof patch 104 can be circular, square or other regular shapes to ensure that gas can pass through smoothly.

[0034] The size and distribution density of the openings 106 can be precisely calculated and arranged according to the battery type, capacity, and expected explosion-proof performance requirements. For example, for high-capacity batteries, larger or higher-density openings 106 can be provided to ensure that a large amount of gas can be discharged in a short time.

[0035] According to one embodiment of the present invention, there are multiple openings 106, and adjacent openings 106 are spaced apart.

[0036] In one embodiment of this utility model, there are multiple openings 106, with adjacent openings 106 spaced apart, and the multiple openings 106 are regularly distributed on the explosion-proof patch 104. The spacing can be designed according to the exhaust requirements and pollution prevention requirements of the explosion-proof valve 102 to ensure that the openings 106 are not interconnected, but can form an effective gas channel.

[0037] By setting multiple spaced openings 106, a uniform ventilation structure is formed on the explosion-proof patch 104. This ensures that the high-pressure gas inside the battery can be smoothly discharged through the openings 106, while the unopened areas between the openings 106 can be used to prevent larger particulate contaminants from directly contacting the explosion-proof valve 102, reducing the risk of contamination of the explosion-proof valve 102. At the same time, it avoids the patch strength from being reduced due to the openings 106 being too dense.

[0038] According to one embodiment of the present invention, a plurality of openings 106 are arranged in a ring. The openings 106 include two sets of straight holes arranged opposite each other and arc-shaped holes located at both ends of the two sets of straight holes. The minimum distance between the two sets of straight holes is less than or equal to the distance between the two rows of grooves in the explosion-proof valve 102.

[0039] In one embodiment of this utility model, a plurality of openings 106 are arranged in a ring, with the central axis of the explosion-proof valve 102 as the center, and are evenly distributed circumferentially. Thus, the plurality of openings 106 form two sets of oppositely arranged straight hole groups and two sets of oppositely arranged arc-shaped hole groups. The two sets of straight hole groups and the two sets of arc-shaped hole groups form a ring-shaped arrangement. The minimum distance W1 between two adjacent sets of straight hole groups is less than or equal to the distance W2 between two rows of grooves in the explosion-proof valve 102, so that the arrangement of the openings 106 corresponds to the position of the grooves in the explosion-proof valve 102.

[0040] It should be noted that the straight hole group mentioned here does not mean that the multiple openings 106 need to be arranged in a strict straight line. It is only necessary to ensure that the multiple openings 106 are arranged roughly along a straight line. Similarly, the curved hole group only needs to ensure that the multiple openings 106 are arranged roughly along a curved shape.

[0041] The annularly arranged openings 106 can work with the serrated structure of the explosion-proof valve 102 to ensure that the explosion-proof patch 104 breaks preferentially along the serrated direction when the internal pressure of the battery reaches the threshold. The spacing design of the openings 106 makes the patch breakage path consistent with the predetermined exhaust direction of the explosion-proof valve 102, thereby improving exhaust efficiency. At the same time, the pressure is evenly distributed through the annular structure to avoid abnormal breakage caused by local stress concentration.

[0042] According to one embodiment of the present invention, along the length direction of the explosion-proof valve 102, the length of the explosion-proof patch 104 is less than the length of the explosion-proof valve 102; half of the difference between the length of the explosion-proof patch 104 and the length of the explosion-proof valve 102 ranges from 0.5 mm to 5 mm.

[0043] In one embodiment of this utility model, along the length direction of the explosion-proof valve 102, the length L1 of the explosion-proof patch 104 is less than the length L2 of the explosion-proof valve 102, and half of the length difference between the two ranges from 0.5 mm to 5 mm. That is, the explosion-proof patch 104 leaves an uncovered area of ​​0.25 mm to 2.5 mm at each end of the explosion-proof valve 102. This area can be used to expose the connection structure between the explosion-proof valve 102 and the cover plate body 100 or for subsequent processing.

[0044] By controlling the length of the explosion-proof patch 104 to be less than that of the explosion-proof valve 102, and reserving edge areas at both ends of the explosion-proof valve 102, the patch is prevented from completely covering the grooves or connection structures of the explosion-proof valve 102. This ensures that the explosion-proof valve 102 can withstand force and break normally when venting. At the same time, the reserved edge areas facilitate the fixing of the explosion-proof patch 104 to the explosion-proof valve 102 by welding or pasting, thereby improving installation accuracy and structural stability.

[0045] According to one embodiment of the present invention, the width W3 of the opening 106 ranges from 0.05 mm to 0.2 mm.

[0046] In one embodiment of this utility model, the width W3 of a single opening 106 ranges from 0.05 mm to 0.2 mm. The width of the opening 106 is optimized according to the gas discharge rate inside the battery and the requirements for pollution prevention, so as to ensure that the opening 106 can both allow gas to pass through smoothly and block impurity particles with a diameter larger than the width of the opening 106.

[0047] The width of the opening 106 is limited to the range of 0.05 mm to 0.2 mm, which can meet the micro-ventilation requirements during normal battery operation (such as balancing internal air pressure) and effectively prevent larger pollutants such as dust and metal shavings from contacting the explosion-proof valve 102 through the opening 106, thus avoiding the deterioration of the exhaust performance of the explosion-proof valve 102 due to contamination, and achieving a balance between ventilation efficiency and anti-contamination capability.

[0048] According to one embodiment of the present invention, a soldering station 108 is formed on the explosion-proof valve 102 along the length direction of the explosion-proof patch 104, and a portion of the edge of the explosion-proof patch 104 overlaps with the soldering station 108; the value range of the overlap between the portion of the edge of the explosion-proof patch 104 and the soldering station 108 along the length direction of the explosion-proof patch 104 is 0.5 mm to 2 mm.

[0049] In one embodiment of this utility model, a soldering station 108 is formed on the explosion-proof valve 102 along the length direction of the explosion-proof patch 104. Part of the edge of the explosion-proof patch 104 overlaps with the soldering station 108. The value of the overlapping part W4 ranges from 0.5 mm to 2 mm, that is, the edge of the explosion-proof patch 104 extends beyond the edge of the soldering station 108 by 0.5 mm to 2 mm. The patch and the soldering station 108 are fixedly connected by a welding process.

[0050] By overlapping and welding the edge of the explosion-proof patch 104 with the soldering station 108, a reliable mechanical and electrical connection is formed, ensuring that the patch is not easy to fall off or shift during long-term battery use. At the same time, the size design of the overlapping area takes into account both welding strength and patch positioning accuracy, avoiding weak connection due to insufficient overlap or solder overflow and contamination of the explosion-proof valve 102 due to excessive overlap, thereby improving the overall reliability of the cover assembly.

[0051] A second aspect of this utility model provides a battery cell, including a housing and a cover plate assembly as described above, the cover plate assembly being disposed on the housing.

[0052] The casing within this battery cell is the housing structure for the entire cell. It is typically made of high-strength, corrosion-resistant metal or plastic, providing stable physical protection and a sealed environment for the electrodes, electrolyte, and other components inside the cell. Its shape and size are customized according to the specific application scenario and design requirements of the battery cell to ensure precise fit with all internal components.

[0053] The aforementioned cover assembly is mounted on the housing, and the two are tightly joined using sealing techniques such as welding and sealant application. This ensures the internal sealing of the battery cell, preventing electrolyte leakage and the ingress of external moisture, air, and other impurities. During installation, the positions of the explosion-proof valve 102 and explosion-proof patch 104 on the cover assembly are adapted to the internal battery structure of the housing to ensure that the explosion-proof device functions properly in the event of a battery malfunction. For example, the position of the explosion-proof valve 102 should correspond to areas within the battery where high-pressure gas may be generated, allowing for timely gas release when pressure increases.

[0054] According to the battery cell provided in the second aspect of this utility model, when the internal pressure of the battery cell rises sharply due to short circuits, overcharging, or other reasons, the explosion-proof valve 102 and explosion-proof patch 104 on the cover assembly work together to release the pressure in a timely manner, preventing serious safety accidents such as battery cell explosion or fire, and effectively protecting the safety of equipment and personnel using the battery cell. The tight connection between the shell and the cover assembly prevents electrolyte leakage, which not only ensures the normal performance of the battery cell but also avoids corrosion and damage to the surrounding environment and equipment by the electrolyte. At the same time, good sealing also prevents external moisture and air from entering the battery cell, preventing the electrode material from being oxidized or damp, thereby extending the service life and stability of the battery cell.

[0055] A third aspect of this utility model provides a battery, including the cover assembly as described above, or the battery cell as described above.

[0056] When the battery uses the aforementioned cover assembly, it will be properly assembled with other key components of the battery. First, based on the specific design of the battery, the cover assembly will be precisely installed in the corresponding position on the battery, usually the top, serving as an important sealing and protective structure.

[0057] The cover body 100 in the cover assembly serves as the basic support, and its material and structure can withstand the pressure generated inside the battery and the influence of the external environment. The explosion-proof valve 102 is precisely set on the cover body 100 and corresponds to the gas-generating area inside the battery, ensuring timely opening when the internal pressure of the battery abnormally increases. The explosion-proof patch 104 is located on the side of the explosion-proof valve 102 away from the cover body 100. The openings 106 on it are carefully designed, and their size, shape, number, and distribution can be adjusted according to the performance and usage requirements of the battery to achieve optimal gas emission and pollution prevention effects.

[0058] If the battery uses the aforementioned cells, the cells are the core component of the battery, comprising a casing and a cover assembly mounted on the casing. The cells are strategically placed inside the battery casing, which is typically made of a robust and durable material with certain protective properties, providing further protection for the cells.

[0059] A buffer and fixing structure is installed between the outer casing and the battery cell to prevent the cell from shaking inside the battery and to provide some shock absorption. In addition, corresponding circuit connection structures are arranged to reliably connect the battery cell to the positive and negative output terminals of the battery to realize the battery's charging and discharging functions.

[0060] According to the battery provided in the third aspect embodiment of this utility model, the explosion-proof design of the cover assembly greatly improves the battery's safety performance. When abnormal conditions such as overcharging or short circuits occur inside the battery, causing pressure to rise, the explosion-proof valve 102 and the explosion-proof patch 104 work together to release pressure in a timely manner, preventing the battery from exploding or catching fire, and effectively protecting the safety of users and equipment. The opening 106 on the explosion-proof patch 104 allows gas to escape while blocking dust, impurities, etc., from entering the battery, preventing damage to the battery's internal structure and performance, and extending the battery's service life.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cover plate assembly, characterized in that, The device includes a cover plate body, on which an explosion-proof valve is provided. An explosion-proof patch is provided on the side of the explosion-proof valve opposite to the cover plate body, and the explosion-proof patch has an opening.

2. The cover plate assembly according to claim 1, characterized in that, There are multiple openings, and adjacent openings are spaced apart.

3. The cover plate assembly according to claim 2, characterized in that, The multiple openings are arranged in a ring, and the openings include two sets of straight holes arranged opposite each other and arc-shaped holes located at both ends of the two sets of straight holes. The minimum distance between the two sets of straight holes is less than or equal to the distance between the two rows of grooves in the explosion-proof valve.

4. The cover plate assembly according to claim 1, characterized in that, Along the length of the explosion-proof valve, the length of the explosion-proof patch is less than the length of the explosion-proof valve.

5. The cover plate assembly according to claim 4, characterized in that, The difference between the length of the explosion-proof patch and the length of the explosion-proof valve is half of the value ranging from 0.5 mm to 5 mm.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that, The width of the opening ranges from 0.05 mm to 0.2 mm.

7. The cover plate assembly according to any one of claims 1 to 5, characterized in that, Along the length of the explosion-proof patch, a soldering station is formed on the explosion-proof valve, and a portion of the edge of the explosion-proof patch overlaps the soldering station.

8. The cover plate assembly according to claim 7, characterized in that, Along the length of the explosion-proof patch, the overlap between a portion of the edge of the explosion-proof patch and the soldering station ranges from 0.5 mm to 2 mm.

9. A battery cell, characterized in that, It includes a housing and a cover assembly as described in any one of claims 1 to 8, the cover assembly being disposed on the housing.

10. A battery, characterized in that, It includes the cover plate assembly as described in any one of claims 1 to 8, or the battery cell as described in claim 9.

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