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, an insulating part and at least one electrode assembly, wherein the cover plate body can be installed on a shell of a single battery in a sealing mode, a supporting piece is arranged at the position, close to the edge, of one side wall of the cover plate body, and the supporting piece is used for abutting against and pressing a pole group of the single battery; the at least one electrode assembly is arranged on the cover plate body and can be electrically connected with the electrode group; the insulating part is arranged on one side wall of the cover plate body, the insulating part is used for insulating the cover plate body and the structure in the shell of the single battery, and the supporting part penetrates through the insulating part and can abut against the pole group. According to the battery cover plate assembly, auxiliary limiting can be added to a pole group in the length direction of the pole group, so that the limiting effect of the battery cover plate assembly on the pole group in the length direction of the battery cover plate assembly is improved, the pole group is prevented from moving after an insulating part loses efficacy, the safety of the pole group and the smoothness of an exhaust channel are improved, and meanwhile, the assembly of a single battery is also facilitated.

Description

Technical Field

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

[0002] With the rapid development of the electric vehicle industry, automakers are increasingly demanding long-range batteries, driving the rapid development of high-energy-density lithium-ion batteries. Lithium-ion batteries, due to their high operating voltage, high energy density, large capacity, low self-discharge, excellent cyclability, long service life, light weight, and compact size, have gradually become one of the primary batteries used in electric vehicles.

[0003] Currently, lithium-ion batteries typically consist of a cover plate, a housing, an electrode assembly, and an electrolyte. The cover plate integrates the electrode posts, explosion-proof valve, and lower plastic components. The electrode assembly is installed within the housing, with the cover plate sealing the housing opening. The electrode assembly is electrically connected to the cover plate posts via tabs welded to the cover plate posts. The length of the electrode assembly is primarily secured by the pressure of the lower plastic component beneath the cover plate. The cover plate incorporates an explosion-proof valve structure to facilitate the directional discharge of high-temperature, high-pressure gases from the battery when thermal runaway occurs due to an internal short circuit. However, existing lower plastic components lack strength and high-temperature resistance. When thermal runaway occurs, the lower plastic component often melts, rendering its securing function on the tabs ineffective and allowing the electrode assembly to move freely within the housing. This can compromise the safety of the electrode assembly, especially when the explosion-proof valve begins to release pressure. The electrode assembly may follow the direction of gas discharge and move toward the explosion-proof valve, blocking the exhaust path and significantly reducing the valve's exhaust efficiency, thereby degrading the safety of the lithium-ion battery.

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

[0005] One purpose of the present utility model is to provide a battery cover assembly that can add auxiliary limiters to the length direction of the electrode group, thereby improving the limiting effect of the battery cover assembly on the electrode group along its own length direction, so as to avoid the movement of the electrode group after the insulation fails, improve the safety of the electrode group and the smoothness of the exhaust channel, and also facilitate the assembly of single batteries.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Battery cover assembly, including:

[0008] The cover body can be sealed and mounted on the housing of the single cell. A support member is provided near the edge of one side wall of the cover body. The support member is used to abut and press the electrode group of the single cell.

[0009] At least one electrode assembly is disposed on the cover body, and the electrode assembly can be electrically connected to the electrode group;

[0010] The insulating member is provided on a side wall of the cover body and is used to insulate the cover body from the structure inside the shell of the single battery. The supporting member passes through the insulating member and can abut against the electrode group.

[0011] Optionally, the support member includes a plurality of protrusions and a plurality of connecting portions, the protrusions and the connecting portions are staggered, the connecting portions are fixedly connected to a side wall of the cover body near the edge, the protrusions are passed through the insulating member and can abut against the pole group.

[0012] Optionally, the support member is stamped and formed, and the support member and the cover plate body are connected by welding.

[0013] Optionally, the support member and the cover body are integrally formed, and the support member includes a plurality of protrusions, which are arranged on a side wall of the cover body near an edge.

[0014] Optionally, the distance between the support member and the edge of a side wall of the cover body is D, 5mm≤D≤10mm.

[0015] Optionally, the height of the supporting member is not greater than the thickness of the insulating member.

[0016] Optionally, the width of the support member is W, 5mm≤W≤10mm.

[0017] Optionally, the insulating member is provided with an avoidance hole, and the supporting member is passed through the avoidance hole.

[0018] Optionally, a projected area of ​​the avoidance hole on the cover body is larger than a projected area of ​​the support member on the cover body.

[0019] Another object of the present invention is to provide a single cell battery that can limit the pole group along its own length direction to prevent the pole group from moving, thereby improving the safety of the single cell battery and the smoothness of the exhaust channel, and also facilitating the assembly of the single cell battery.

[0020] To achieve this purpose, the present invention adopts the following technical solutions:

[0021] The single cell comprises a shell, an electrode group and the above-mentioned battery cover assembly. The above-mentioned electrode group is arranged in the above-mentioned shell, and the above-mentioned battery cover assembly is sealed at the opening of the above-mentioned shell.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a battery cover assembly and a single cell. By arranging a support member near the edge of a side wall of the cover body, and when the battery cover assembly is assembled on the single cell, the support member is arranged through the insulating member and abuts against the electrode group, thereby improving the limiting and fixing effect on the length direction of the electrode group. Even if the internal electrode group undergoes thermal runaway and causes the insulating member in the battery cover assembly to melt, the electrode group can still be limited in the length direction, avoiding the safety problem caused by the blockage of the exhaust channel due to the movement of the electrode group, thereby improving the safety of the single cell equipped with the battery cover assembly and the smooth flow of the exhaust channel. In addition, the arrangement of the support member near the edge of the battery cover assembly will not affect the assembly of the electrode group, nor will it affect the use and assembly of other structures on the battery cover assembly, making it more convenient to use and assemble the battery cover assembly and the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded view of a battery cover assembly provided by some embodiments of the present invention;

[0025] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 3 is an exploded view of a battery cover assembly provided by some other embodiments of the present utility model;

[0027] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0028] Figure 5 It is an exploded diagram of a single battery provided by some embodiments of the present invention.

[0029] In the picture:

[0030] 10. Cover plate body;

[0031] 20. Support member; 21. Protrusion; 22. Connecting portion; 23. Protrusion;

[0032] 30. Insulation; 31. Avoidance hole;

[0033] 40. Explosion-proof valve;

[0034] 200. Shell. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] Refer to the following Figures 1 to 5 The utility model introduces a battery cover assembly and a single battery.

[0040] Please refer to Figure 1 and Figure 3 This embodiment provides a battery cover assembly, comprising a cover body 10, an insulating member 30, and at least one electrode assembly. The cover body 10 can be sealed and mounted on the housing 200 of a single cell. A support member 20 is provided near the edge of a side wall of the cover body 10. The support member 20 is used to abut and compress the electrode group of the single cell. At least one electrode assembly is disposed on the cover body 10 and can be electrically connected to the electrode group. The insulating member 30 is disposed on a side wall of the cover body 10. The insulating member 30 is used to insulate the cover body 10 from the structure within the housing 200 of the single cell. The support member 20 passes through the insulating member 30 and can abut the electrode group.

[0041] The battery cover assembly in this embodiment is provided with a support member 20 near the edge of one side wall of the cover body 10. When the battery cover assembly is assembled on a single cell, the support member 20 is passed through the insulating member 30 and abuts against the electrode group, thereby improving the limiting support function in the length direction of the electrode group. Even if the internal electrode group undergoes thermal runaway and the insulating member 30 in the battery cover assembly melts, the electrode group can still be limited in the length direction, avoiding the safety problems caused by the blockage of the exhaust channel caused by the movement of the electrode group, thereby improving the safety of the single cell equipped with the battery cover assembly and the smooth flow of the exhaust channel. In addition, the provision of the support member 20 near the edge of the battery cover assembly will not affect the assembly of the electrode group, nor will it affect the use and assembly of other structures on the battery cover assembly, making it more convenient to use and assemble the battery cover assembly and the single cell equipped with the battery cover assembly.

[0042] It should be noted that the above-mentioned support member 20 provides limited support to the electrode group to avoid blocking the exhaust channel, which includes but is not limited to blocking the exhaust channel inside the shell 200 and blocking the exhaust port on the battery cover assembly.

[0043] Specifically, the battery cover assembly includes an explosion-proof valve 40, which is arranged near the center of the cover body 10. The support member 20 will not interfere with the pressure relief function of the explosion-proof valve 40. At the same time, the support member 20 also limits the pole group to avoid the problem of poor pressure relief effect caused by the pole group blocking the explosion-proof valve 40, thereby improving the safety of the single battery.

[0044] In some embodiments, the support member 20 and the cover body 10 are integrally formed or the support member 20 and the cover body 10 are welded.

[0045] Please refer to Figure 1 and Figure 2 Optionally, the support member 20 and the cover body 10 are provided separately, with one end of the support member 20 connected to the cover body 10 and the other end protruding and capable of abutting the pole group. Specifically, the support member 20 includes a plurality of protrusions 21 and a plurality of connecting portions 22, which are arranged alternately. The connecting portion 22 is fixedly connected to a side wall of the cover body 10 near the edge. The protrusion 21 passes through the insulating member 30 and can abut the pole group. This can not only realize the support member 20's role of limiting the support of the pole group, but also achieve a fixed connection between the support member 20 and the cover body 10.

[0046] Specifically, the support member 20 is stamped and formed, and the support member 20 and the cover body 10 are welded together, specifically, the connecting portion 22 is welded together with the cover body 10 , thereby realizing the forming of the support member 20 and the connection with the cover body 10 .

[0047] Please refer to Figure 3 and Figure 4 Optionally, the support member 20 and the cover body 10 are integrally formed. Specifically, the support member 20 includes a plurality of protrusions 23, which are arranged near the edge of a side wall of the cover body 10. The protrusions 23 form support columns, which can realize the limiting support function of the support member 20 on the electrode group.

[0048] It is understandable that in some other embodiments, the support member 20 and the cover body 10 can also be integrally formed by stamping. This arrangement not only realizes the forming of the protrusion 23 of the support member 20, but also improves the structural strength of the cover body 10.

[0049] Optionally, the distance D between the support member 20 and the edge of a side wall of the cover body 10 is 5mm≤D≤10mm, which can avoid interference between the support member 20 and the cavity wall of the housing 200, thereby ensuring better assembly of the battery cover assembly and the housing 200. At the same time, it will not be close to the center of the cover body 10, causing interference with the connection of the tab and the electrode assembly and short circuit problems, thereby improving the safety of the single battery assembled with the battery cover assembly.

[0050] Optionally, the height of the support member 20 is not greater than the thickness of the insulating member 30. Since the insulating member 30 is a structure that limits the support in the length direction of the electrode group, the insulating member 30 also abuts against the electrode group. If the height of the support member 20 is greater than the thickness of the insulating member 30, it may cause excessive pressure on the electrode group and damage the electrode group, thereby avoiding assembly interference and improving the safety of the single battery assembled with the battery cover assembly.

[0051] Exemplarily, the height of the support member 20 is 2 mm to 4 mm, and within this range, the support of the electrode group can be satisfied without causing interference.

[0052] Optionally, the width of the support member 20 is W, 5mm≤W≤10mm, which can support the electrode group without occupying a large volume, thereby improving volume utilization.

[0053] Please refer to Figure 1 and Figure 3 In some embodiments, the insulating member 30 is provided with an avoidance hole 31 , and the support member 20 is passed through the avoidance hole 31 , so that the support member 20 can pass through the insulating member 30 and support the pole group.

[0054] Specifically, the opening shape of the avoidance hole 31 can be a triangle, a square, etc., as long as it can fit through the support member 20, and is not specifically limited here. For example, the opening shape of the avoidance hole 31 in this embodiment is a square.

[0055] Optionally, a projection area of ​​the avoidance hole 31 on the cover body 10 is larger than a projection area of ​​the support member 20 on the cover body 10 , so as to ensure that the support member 20 can pass through.

[0056] In some embodiments, the cover body 10 is further provided with a liquid injection hole to facilitate injection of electrolyte into the housing 200 .

[0057] In some embodiments, the insulating member 30 is further provided with a plurality of communication holes to connect the cover body 10 with the gas path within the single cell, ensuring that the explosion-proof valve 40 effectively relieves pressure and exhausts gas within the single cell. Furthermore, the insulating member 30 also has a through-hole to allow the electrode assembly to be electrically connected to the tab of the electrode group via the adapter, thereby achieving external electrical connection of the single cell.

[0058] Optionally, the electrode assembly includes structures such as poles and seals, which are commonly used structures in the art to achieve electrical connection between the inner pole group of the single cell and the outside. The specific structure will not be described here.

[0059] Please refer to Figure 5 This embodiment also provides a single cell battery comprising a housing 200, an electrode group, and a battery cover assembly as described in any of the above-described embodiments. The electrode group is disposed within the housing 200, and the battery cover assembly is sealed within the opening of the housing 200. This single cell battery utilizes the aforementioned battery cover assembly, so that if the electrode group within the single cell experiences thermal runaway, even if the insulating member 30 melts and fails, the support member 20 can still provide positional support for the electrode group, preventing the electrode group from blocking the exhaust passage. This allows the explosion-proof valve 40 to function properly for explosion protection and pressure relief, thereby improving the safety of the single cell battery. This single cell battery can power electrical equipment such as battery packs, pure electric vehicles, hybrid electric vehicles, ships, and energy storage devices, and will not be further described here.

[0060] It is understandable that the number of openings of the shell 200, the number of battery cover assemblies and the number of electrode assemblies can be determined according to actual needs. For example, the number of openings of the commonly used shell 200 can be one or two, and the corresponding battery cover assemblies can also be one or two. Generally, when the number of openings of the shell 200 is one, the number of electrode assemblies of the battery cover assembly can be one or two, wherein, when the number of electrode assemblies is one, the shell 200 and the battery cover assembly serve as another electrode assembly to realize the output and input of two electrodes of different polarities of the single cell; when the number of openings of the shell 200 is two, the number of electrodes of the battery cover assembly is one, thereby realizing the output and input of two electrodes of different polarities of the single cell.

[0061] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Battery cover assembly, characterized in that: include: The cover body can be sealed and mounted on the housing of the single cell. A support member is provided near the edge of one side wall of the cover body, and the support member is used to abut and press the electrode group of the single cell. at least one electrode assembly, disposed on the cover body, the electrode assembly being electrically connected to the electrode group; An insulating member is provided on a side wall of the cover body, and is used to insulate the cover body from the structure inside the shell of the single battery. The supporting member passes through the insulating member and can abut against the electrode group.

2. The battery cover assembly according to claim 1, characterized in that: The support member includes a plurality of protrusions and a plurality of connecting portions, the protrusions and the connecting portions are arranged alternately, the connecting portion is fixedly connected to a side wall of the cover body near the edge, the protrusion is passed through the insulating member and can abut against the pole group.

3. The battery cover assembly according to claim 2, characterized in that: The support member is formed by stamping, and the support member and the cover plate body are welded together.

4. The battery cover assembly according to claim 1, characterized in that: The support member and the cover body are integrally formed. The support member includes a plurality of protrusions, and the protrusions are arranged near an edge of a side wall of the cover body.

5. The battery cover assembly according to claim 1, characterized in that: The distance between the support member and the edge of a side wall of the cover body is D, 5mm≤D≤10mm.

6. The battery cover assembly according to claim 1, characterized in that: The height of the supporting member is no greater than the thickness of the insulating member.

7. The battery cover assembly according to claim 1, characterized in that: The width of the support member is W, 5mm≤W≤10mm.

8. The battery cover assembly according to any one of claims 1 to 7, characterized in that: The insulating member is provided with an avoidance hole, and the supporting member is passed through the avoidance hole.

9. The battery cover assembly according to claim 8, characterized in that: The projected area of ​​the avoidance hole on the cover body is larger than the projected area of ​​the support member on the cover body.

10. A single cell battery, characterized in that: The battery cover assembly comprises a shell, an electrode group and a battery cover assembly according to any one of claims 1 to 9, wherein the electrode group is arranged in the shell, and the battery cover assembly is sealed at the opening of the shell.

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