Battery cover plate and battery
By setting a flange on the battery cover plate and placing the pressure relief part in the exhaust hole, the welding part is located outside the plate body, the problem of deformation of the pressure relief part during welding is solved, and the valve opening pressure of the battery cover plate is ensured.
Patent Information
- Application Number
- CN202323264099.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2033-11-30
AI Technical Summary
When welding the lithium-ion battery cover plate, the pressure relief part deforms due to the close distance of the welding trajectory, causing the marks to become thinner and reduce the battery valve opening pressure.
Design a battery cover plate, by providing a first flange on the plate body and a second flange on the pressure relief member, and placing the pressure relief member in the exhaust hole, the welding part is located outside the plate body, and dissipating by heat To avoid stress on the pressure relief part.
It effectively avoids stretching deformation and thinning of the pressure relief parts, and ensures the opening pressure of the battery.
Smart Images
Figure CN222320383U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of battery technology, and in particular relates to a battery cover and a battery. Background Art
[0002] Lithium-ion batteries are widely used in electric vehicles and energy storage as power batteries. Lithium battery cover is a key accessory in lithium-ion batteries. Its functions are to weld with the shell to form a sealed cavity, lead out the positive and negative electrodes of the electrode group, and serve as an assembly carrier. The battery cover has a plain aluminum sheet and an explosion-proof sheet, which are connected by welding. There are exhaust holes on the plain aluminum sheet, and there is a sink for placing the explosion-proof sheet in the exhaust hole. The depth of the sink is consistent with the height of the edge of the explosion-proof sheet. The explosion-proof sheet is placed on the plain aluminum sheet sink and welded. However, since the welding tracks of the explosion-proof sheet and the plain aluminum sheet are close, the explosion-proof sheet will be stretched and deformed during welding cooling, causing the notch on the explosion-proof sheet to become thinner, reducing the battery valve opening pressure. Utility Model Content
[0003] Purpose of the utility model: The embodiment of the present application provides a battery cover plate, which aims to overcome the technical problem that when the pressure relief part is welded to the plate body, the welding track is close to the pressure relief part, which will cause the pressure relief part to be stretched and deformed.
[0004] Technical solution: A battery cover according to an embodiment of the present application, wherein the battery cover has a first direction and a second direction intersecting each other, including:
[0005] A plate body, the plate body comprising a main body and a first flange connected to each other, the main body is provided with an exhaust hole, the first flange is arranged around the exhaust hole, and the first flange is arranged to protrude from the main body along the first direction;
[0006] a pressure relief member, the pressure relief member covers the exhaust hole, the pressure relief member has a second flange extending along the first direction, and the second flange is connected to the first flange;
[0007] Wherein, along the second direction, at least a portion of the orthographic projection of the second flange is located within the orthographic projection of the first flange.
[0008] In some embodiments, a welding portion is formed between the first flange and the second flange, and at least a portion of the welding portion is located outside the exhaust hole.
[0009] In some embodiments, the exhaust hole includes a first through hole and a second through hole that are interconnected, the first through hole is configured to place the pressure relief member, and the second through hole is located on a side of the pressure relief member facing the battery.
[0010] In some embodiments, along the second direction, the first through hole has a first maximum dimension D1, and the second through hole has a second maximum dimension D2, satisfying: D1>D2.
[0011] In some embodiments, along the first direction, the body has a first surface and a second surface facing away from each other, the first flange has a first dimension D3 protruding from the first surface, satisfying: 0.5mm≤D3≤1mm, and the second flange has a second dimension D4 protruding from the first surface, satisfying: D3=D4.
[0012] In some embodiments, along the first direction, the welding portion has a third dimension D5 protruding from the first surface, satisfying: 0.4 mm≤D5≤0.6 mm.
[0013] In some embodiments, the body comprises:
[0014] A step is located in the exhaust hole and is arranged along the circumference of the pressure relief member; the pressure relief member is arranged on a side of the step close to the first flange.
[0015] In some embodiments, the plate body is provided with a first notch, and the first notch is located on the first flange;
[0016] The pressure relief member is provided with a second notch, and at least a portion of the second notch is located on the second flange.
[0017] In some embodiments, along the first direction, the orthographic projection of the second flange on the plane where the body is located is located within the orthographic projection of the step on the plane where the body is located.
[0018] Correspondingly, the present application also provides a battery, comprising the above-mentioned battery cover, wherein the battery is located on the side of the body facing the second surface.
[0019] Beneficial effect: The battery cover of the embodiment of the present application is provided with a first flange on the main body so that the first flange protrudes from the first surface of the main body, and then a second flange is provided on the pressure relief piece. After the pressure relief piece is placed inside the exhaust hole, the second flange on the pressure relief piece also protrudes from the first surface of the main body, and the first flange and the second flange are at the same height. Then, the surfaces where the first flange and the second flange are in contact are welded. Since the welding position is outside the plate body, during welding, the heat source acts on the first flange and the second flange, so that the welding track is away from the pressure relief piece, and the heat generated during welding is easier to dissipate, which makes the stress acting on the pressure relief piece easier to release. This can avoid the pressure relief piece from being stretched and deformed to a certain extent, prevent the notch on the pressure relief piece from becoming thinner, and ensure the battery valve opening pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0021] Figure 1 This is a schematic diagram of the structure in which the plate body and the pressure relief member are connected as one body in an embodiment of the present application;
[0022] Figure 2 For the embodiment of this application Figure 1 Schematic diagram of the enlarged structure of area A in the middle;
[0023] Figure 3 This is a schematic diagram of the structure of the board according to an embodiment of the present application;
[0024] Figure 4 This is a schematic diagram of the structure of a pressure relief component according to an embodiment of the present application;
[0025] Figure 5 This is a schematic cross-sectional view of the connection between the plate body and the pressure relief member of the embodiment of the present application;
[0026] Figure 6 This is a schematic diagram of the structure of the exhaust hole in an embodiment of the present application;
[0027] Figure markings: 1-plate body; 11-exhaust hole; 111-first through hole; 112-second through hole; 12-main body; 121-step; 122-first surface; 123-second surface; 13-first flange; 14-first notch; 2-pressure relief member; 21-second flange; 22-second notch; 3-welding portion; X-first direction; Y-second direction. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0029] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.
[0030] It should also be noted that in the drawings of the embodiments of the present application, the arrows marked with X and Y represent the first direction X and the second direction Y respectively. The first direction X and the second direction Y are introduced in the description of the present application to more clearly describe the structure and relative position relationship of each component in the waste heat boiler, wherein the first direction X and the second direction Y are two relative directions intersecting each other. In practical applications, the first direction X can be the thickness direction of the plate body, and the second direction Y can be the length direction of the plate body. Preferably, the first direction X and the second direction Y are perpendicular to each other.
[0031] Lithium-ion batteries are widely used in electric vehicles and energy storage as power batteries. Lithium battery cover is a key accessory in lithium-ion batteries. Its functions are to weld with the shell to form a sealed cavity, lead out the positive and negative electrodes of the electrode group, and serve as an assembly carrier. There are plain aluminum sheets and explosion-proof sheets on the battery cover, which are connected by welding. There are exhaust holes on the plain aluminum sheet, and there is a sink for placing the explosion-proof sheet in the exhaust hole. The depth of the sink is consistent with the height of the edge of the explosion-proof sheet. The explosion-proof sheet is placed on the plain aluminum sheet sink and then welded. However, due to the close distance between the welding tracks of the explosion-proof sheet and the plain aluminum sheet, the close welding position may cause the temperature of the explosion-proof sheet to rise during the welding process. When cooling after welding, the explosion-proof sheet will be stretched and deformed under the action of stress, causing the notch on the explosion-proof sheet to become thinner or even crack, which affects the service life of the explosion-proof sheet and reduces the battery valve opening pressure.
[0032] In view of this, an embodiment of the present application provides a battery cover to overcome at least one of the above-mentioned technical problems.
[0033] Please also read Figures 1 to 6 In the embodiment of the present application, the battery cover has a first direction X and a second direction Y that intersect, and preferably, the first direction X is perpendicular to the second direction Y. The battery cover includes a plate body 1 and a pressure relief member 2. The plate body 1 includes a main body 12 and a first flange 13 that are connected to each other. The main body 12 is provided with an exhaust hole 11, and the first flange 13 is arranged around the exhaust hole 11, and the first flange 13 is arranged to protrude from the main body 12 along the first direction X. Specifically, the plate body 1 is arranged on the battery to seal the battery. The exhaust hole 11 is arranged on the plate body 1. During the use of the battery, some gas will be generated inside due to some chemical reactions. These gases can be discharged to the outside through the exhaust hole 11 to avoid excessive pressure inside the battery and explosion. The shape of the first flange 13 is the same as that of the exhaust hole 11, and the size of the first flange 13 is slightly larger than the exhaust hole 11, so it can be arranged outside the exhaust hole 11 around the exhaust hole 11, and at the same time, it is arranged to protrude from the main body 12 along the first direction X. In the first direction X, the height of the first flange 13 is greater than the height of the main body 12;
[0034] The pressure relief member 2 covers the exhaust hole 11. The pressure relief member 2 has a second flange 21 extending along the first direction X. The second flange 21 is connected to the first flange 13. Specifically, the pressure relief member 2 covers the exhaust hole 11 to block the gas passing through the exhaust hole 11, and also isolates the external environment from the interior of the battery to prevent foreign matter from falling into the interior of the battery. A second notch 22 is provided on the pressure relief member 2. When more gas is generated inside the battery and the pressure inside the battery reaches a preset pressure value, the second notch 22 will rupture, so that the gas can be discharged through the exhaust hole 11 to achieve the purpose of pressure relief. The pressure relief member 2 has a second flange 21 extending along the first direction X, and the second flange 21 protrudes from the pressure relief member 2.
[0035] Among them, along the second direction Y, at least part of the orthographic projection of the second flange 21 is located within the orthographic projection of the first flange 13, that is, the second flange 21 also protrudes from the main body 12, and the height of the second flange 21 is also greater than the height of the main body 12, so that outside the exhaust hole 11, even if the heights of the first flange 13 and the second flange 21 are different, at least part of the first flange 13 and the second flange 21 are in contact and can be welded.
[0036] Specifically, the plate body 1 may be a plain aluminum sheet, and the pressure relief component 2 may be an explosion-proof sheet;
[0037] Please also read Figures 1 to 5 In some embodiments, a welding portion 3 is formed between the first flange 13 and the second flange 21, and at least a portion of the welding portion 3 is located outside the exhaust hole 11; the welding portion 3 is located at the position where the first flange 13 and the second flange 21 are in contact, and the depth of the welding portion 3 can be determined according to the welding requirements and the heights of the first flange 13 and the second flange 21. Since the welding portion 3 is located outside the exhaust hole 11 and is far away from the pressure relief member 2, the heat generated by the welding is easy to dissipate during the welding process, which makes it easier to release the stress acting on the pressure relief member during the welding process, which can avoid the pressure relief member from being stretched and deformed to a certain extent, prevent the notch on the pressure relief member from becoming thinner, and ensure the battery valve opening pressure.
[0038] See also Figure 6 In some embodiments, the exhaust hole 11 includes a first through hole 111 and a second through hole 112 that are interconnected. The first through hole 111 is configured to place the pressure relief member 2, and the second through hole 112 is located on the side of the pressure relief member 2 facing the battery. The first through hole 111 and the second through hole 112 are connected and pass through the body 12 together. The first through hole 111 is used to place the pressure relief member 2, and can be used to play a certain positioning role when the pressure relief member 2 is installed.
[0039] In some embodiments, along the second direction Y, the first through hole 111 has a first maximum dimension D1, and the second through hole 112 has a second maximum dimension D2, satisfying: D1>D2; that is, the projection of the first through hole 111 along the first direction X is at least partially located outside the projection of the second through hole 112 along the first direction X, so that the pressure relief member 2 can be placed inside the first through hole 111.
[0040] Please also read Figures 1 to 5 In some embodiments, along the first direction X, the body 12 has a first surface 122 and a second surface 123 that are opposite to each other, and the first flange 13 has a first dimension D3 protruding from the first surface 122, that is, in the first direction X, the height of the first flange 13 is higher than the height of the first surface 122, the protruding dimension is D3, and satisfies: 0.5mm≤D3≤1mm, and the second flange 21 has a second dimension D4 protruding from the first surface 122. In the first direction X, the height of the second flange 21 is greater than the height of the first surface 122, the protruding dimension is D4, and satisfies: D3=D4, that is, the protruding height of the first flange 13 is the same as the protruding height of the second flange 21, and at the same time, D4 also satisfies 0.5mm≤D4≤1mm.
[0041] In some embodiments, along the first direction X, the welding portion 3 has a third dimension D5 protruding from the first surface 122, satisfying: 0.4mm≤D5≤0.6mm; that is, the welding portion 3 is located outside the main body 12, and the height of the welding portion 3 is also higher than the height of the first surface 122. The dimension D5 of the welding portion 3 satisfies: 0.4mm≤D5≤0.6mm. The dimension D5 of the welding portion 3 does not have to be equal to the dimensions of the first flange 13 and the second flange 21, and can also be smaller than the dimensions of the first flange 13 and the second flange 21, as long as it meets the welding requirements.
[0042] Please also read Figures 3 to 6 In some embodiments, the body 12 includes a step 121, which is located in the exhaust hole 11 and is arranged along the circumference of the pressure relief member 2, that is, the step 121 is actually formed by the first through hole 111 and the second through hole 112, and the step 121 is formed by the size difference between the two, for placing the pressure relief member 2; the pressure relief member 2 is arranged on the side of the step 121 close to the first flange 13.
[0043] In some embodiments, a first notch 14 is provided on the plate body 1, and the first notch 14 is located on the first flange 13; a second notch 22 is provided on the pressure relief member 2, and at least a portion of the second notch 22 is located on the second flange 21; that is, when the air pressure inside the battery breaks through the second notch 22, in order to ensure that the broken part of the pressure relief member 2 breaks more thoroughly, by providing the first notch 14 on the first flange 13 and the second notch 22 on the second flange 21, the broken part can be broken more thoroughly to avoid affecting the pressure relief inside the battery.
[0044] In some embodiments, along the first direction X, the orthographic projection of the second flange 21 on the plane where the body 12 is located is located within the orthographic projection of the step 121 on the plane where the body 12 is located, that is, the second flange 21 is arranged around the edge of the pressure relief member 2, and corresponds to the position of the step 121, so that the orthographic projection of the second flange 21 on the plane where the body 12 is located is located within the orthographic projection of the step 121 on the plane where the body 12 is located.
[0045] Correspondingly, a battery is also provided in this embodiment, including the above-mentioned battery cover, and the battery is located on the side of the body 12 facing the second surface 123. The battery includes the above-mentioned battery cover and has the functions of the above-mentioned battery cover.
[0046] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0047] The battery cover and battery provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by applying specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery cover, characterized in that: The battery cover has a first direction and a second direction intersecting each other, including: A plate body, the plate body comprising a main body and a first flange connected to each other, the main body is provided with an exhaust hole, the first flange is arranged around the exhaust hole, and the first flange is arranged to protrude from the main body along the first direction; a pressure relief member, the pressure relief member covers the exhaust hole, the pressure relief member has a second flange extending along the first direction, and the second flange is connected to the first flange; Wherein, along the second direction, at least a portion of the orthographic projection of the second flange is located within the orthographic projection of the first flange.
2. The battery cover according to claim 1, characterized in that: A welding portion is formed between the first flange and the second flange, and at least a portion of the welding portion is located outside the exhaust hole.
3. The battery cover according to claim 1, characterized in that: The exhaust hole includes a first through hole and a second through hole that are interconnected. The first through hole is configured to place the pressure relief member, and the second through hole is located on a side of the pressure relief member that faces the battery.
4. The battery cover according to claim 3, characterized in that: Along the second direction, the first through hole has a first maximum size D1, and the second through hole has a second maximum size D2, satisfying: D1>D2.
5. The battery cover according to claim 2, characterized in that: Along the first direction, the body has a first surface and a second surface facing away from each other, the first flange has a first dimension D3 protruding from the first surface, satisfying: 0.5mm≤D3≤1mm, and the second flange has a second dimension D4 protruding from the first surface, satisfying: D3=D4.
6. The battery cover according to claim 5, characterized in that: Along the first direction, the welding portion has a third dimension D5 protruding from the first surface, satisfying: 0.4 mm≤D5≤0.6 mm.
7. The battery cover according to claim 1, characterized in that: The body comprises: A step is located in the exhaust hole and is arranged along the circumference of the pressure relief member; the pressure relief member is arranged on a side of the step close to the first flange.
8. The battery cover according to claim 1, characterized in that: The plate body is provided with a first notch, and the first notch is located on the first flange; The pressure relief member is provided with a second notch, and at least a portion of the second notch is located on the second flange.
9. The battery cover according to claim 7, characterized in that: Along the first direction, the orthographic projection of the second flange on the plane where the body is located is located within the orthographic projection of the step on the plane where the body is located.
10. A battery, characterized in that: include: A battery cover as claimed in any one of claims 1 to 9.