Battery shell and battery

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery shell which comprises a shell bottom plate and a shell side wall connected with the shell bottom plate, the shell bottom plate is provided with an anti-explosion valve and comprises a plate body and a supporting part, a mounting hole is formed in the center of the plate body, and the supporting part is arranged in the mounting hole. The mounting hole is used for mounting the explosion-proof valve, and the supporting part is arranged to be a bulge upwards formed by the plate body along the height direction of the battery shell; a mounting hole is formed in the plate body, a step part is arranged on the inner circumferential side of the mounting hole, the step part is provided with a first step body, a second step body and a third step body which are continuous, the first step body is located on the side, close to the side wall of the shell, of the plate body, and the third step body is located on the side, away from the side wall of the shell, of the plate body. In practical application, the area of the anti-explosion valve is not limited, and the bottom of the shell is kept flat. In addition, the utility model also discloses a battery comprising the battery shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a battery shell and a battery. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.

[0003] In order to dissipate the internal high-pressure gas directly when the battery is over-pressured or over-temperatured to achieve the purpose of explosion-proof, most batteries are equipped with explosion-proof valves. However, in the existing battery structure, the area of ​​the explosion-proof valve is limited by the pole, and the bottom of the battery may be uneven during installation. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to provide a battery housing in view of the deficiencies of the prior art, wherein an explosion-proof valve is separately installed at the bottom of the housing so that the volume of the explosion-proof valve is not limited by the pole; a step portion in the mounting hole is arranged corresponding to the explosion-proof valve so that the bottom of the battery housing is flat.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery shell, comprising a shell bottom plate and a shell side wall connected to the shell bottom plate, the shell bottom plate is provided with an explosion-proof valve, the shell bottom plate comprises a plate body and a support portion, a mounting hole is provided at the center of the plate body, the mounting hole is used to install the explosion-proof valve, the support portion is configured as a protrusion of the plate body formed upward along the height direction of the battery shell; a step portion is provided on the inner peripheral side of the mounting hole, the step portion is provided with a continuous first step body, a second step body and a third step body, the first step body is located on the side of the plate body away from the shell side wall, and the third step body is located on the side of the plate body close to the shell side wall.

[0007] As an improvement of the battery housing described in the utility model, the explosion-proof valve includes a valve body and a patch, a fixing glue is provided on a side of the patch close to the valve body, and the patch is adhered to the valve body through the fixing glue.

[0008] In some technical solutions, a gap is left between the patch and the valve body by cutting the glue or setting micropores. The patch can prevent foreign matter from entering the explosion-proof valve. At the same time, the installation method with a gap is convenient for helium inspection. The helium inspection can detect the installation reliability of the explosion-proof valve, thereby improving the safety of the battery housing.

[0009] As an improvement of the battery shell described in the utility model, the first step body and the supporting part are located in the same horizontal plane, the plane where the first step body is located is perpendicular to the plane where the second step body is located, and the third step body and the plane where the second step body is located are perpendicular to each other.

[0010] As an improvement of the battery housing described in the utility model, the first step body and the second step body form a first space, the first space is used to install the valve body, and the depth of the first space in the height direction is greater than or equal to the thickness of the valve body.

[0011] As an improvement of the battery shell described in the utility model, the first step body is provided with at least one hole, the penetration direction of the hole is perpendicular to the height direction of the battery shell, and the hole increases the circulation area of ​​the internal gas to ensure the realization of the pressure relief and explosion-proof function of the explosion-proof valve.

[0012] As an improvement of the battery housing of the utility model, the second step body and the third step body form a second space, the second space is used to paste the patch, and the depth of the second space in the height direction is greater than or equal to the thickness of the patch. The setting of the first space and the second space ensures the flatness of the bottom plate of the housing while meeting the installation requirements of the explosion-proof valve and the patch.

[0013] As an improvement of the battery housing described in the utility model, the plate body has a gas channel, and the gas channel is configured as a depression formed between the support portion and the step portion, and the gas channel ensures smooth circulation of internal gas.

[0014] As an improvement of the battery case described in the utility model, the plate body further includes a welding portion, which is arranged in the area between the protrusion and the side wall of the case, and is used for welding the case bottom plate and the current collecting plate or the pole ear.

[0015] As an improvement of the battery shell described in the utility model, the support part is configured as a circular ring structure, and the support part is arranged around the mounting hole. The support part can support the pole ear or the current collecting plate installed corresponding to the explosion-proof valve while isolating the two, which can not only ensure the realization of the explosion-proof valve function, but also avoid the heat transfer to the pole ear during welding, thereby reducing the possibility of damage to the pole ear; in addition, the support part can increase the strength and rigidity of the battery shell without increasing the thickness of the side wall of the shell, thereby avoiding deformation of the battery shell, saving material usage, reducing weight, and reducing costs.

[0016] In other technical solutions, the support part is configured as a plurality of fan-ring structures with equal center and radius, the plurality of support parts are arranged around the mounting hole, and the plurality of support parts are spaced apart to form gaps, thereby increasing the area for gas flow and further ensuring the realization of the pressure relief and explosion-proof functions of the explosion-proof valve.

[0017] The second purpose of the present utility model is to provide a battery, comprising the battery housing as described above.

[0018] The beneficial effects of the utility model are:

[0019] (1) The battery case of the utility model includes a case bottom plate and a case side wall connected to the case bottom plate, the case bottom plate is provided with an explosion-proof valve, the case bottom plate includes a plate body and a support portion, a mounting hole is provided at the center of the plate body, the mounting hole is used to install the explosion-proof valve, the support portion is provided as a protrusion formed upwardly by the plate body along the height direction of the battery case; a step portion is provided on the inner peripheral side of the mounting hole, the step portion is provided with a continuous first step body, a second step body and a third step body, the first step body is located on the side of the plate body away from the case side wall, and the third step body is located on the side of the plate body close to the case side wall. The battery case of the utility model is only provided with an explosion-proof valve on the case bottom plate, and no other components are provided to limit the volume of the explosion-proof valve, thereby meeting the safety of battery use;

[0020] (2) The setting of the support part in the utility model isolates the explosion-proof valve from the correspondingly installed pole ear or collecting plate, while ensuring the function of the explosion-proof valve, improving the space utilization rate at the bottom of the battery shell, thereby increasing the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0022] Figure 1 This is one of the structural schematic diagrams of implementation mode 1 of the present utility model.

[0023] Figure 2This is the second structural diagram of the first implementation mode of the present utility model.

[0024] Figure 3 It is a schematic structural diagram of the shell bottom plate in the first embodiment of the utility model.

[0025] Figure 4 It is a schematic structural diagram of the shell bottom plate in the second embodiment of the utility model.

[0026] The reference numerals are described as follows:

[0027] 1. Shell bottom plate; 11. Plate body; 111. Mounting hole; 1111. Step portion; 1112. First step body; 1113. Second step body; 1114. Third step body; 112. Gas channel; 113. Welding portion; 12. Support portion;

[0028] 2. Shell side wall;

[0029] 3. Explosion-proof valve; 31. Valve body; 32. Patch. DETAILED DESCRIPTION

[0030] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0033] The following is combined with Figures 1 to 4 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.

[0034] Implementation Method 1

[0035] The following is combined with Figures 1 to 3 Description of Implementation Method 1

[0036] A battery shell comprises a shell bottom plate 1 and a shell side wall 2 connected to the shell bottom plate 1, wherein the shell bottom plate 1 is provided with an explosion-proof valve 3, and the shell bottom plate 1 comprises a plate body 11 and a support portion 12, wherein a mounting hole 111 is provided at the center of the plate body 11, wherein the mounting hole 111 is used to mount the explosion-proof valve 3, and the support portion 12 is configured as a protrusion formed upwardly along the height direction of the battery shell by the plate body 11; a step portion 1111 is provided on the inner peripheral side of the mounting hole 111, wherein the step portion 1111 is provided with a continuous first step body 1112, a second step body 1113 and a third step body 1114, wherein the first step body 1112 is located on a side of the plate body 11 away from the shell side wall 2, and the third step body 1114 is located on a side of the plate body 11 close to the shell side wall 2.

[0037] Furthermore, in this embodiment, the explosion-proof valve 3 is arranged at the center of the housing bottom plate 1, thereby avoiding the eccentric arrangement requiring special positioning manufacturing method and optimizing the process.

[0038] Compared with the existing solution in which the explosion-proof valve 3 and the pole are arranged at the same end of the battery, the battery shell of the present application is only provided with an explosion-proof valve 3 on the shell bottom plate 1, and no other components are provided to limit the volume of the explosion-proof valve 3, thereby meeting the safety of battery use.

[0039] Preferably, the explosion-proof valve 3 includes a valve body 31 and a patch 32 , and a fixing glue is provided on a side of the patch 32 close to the valve body 31 , and the patch 32 is adhered to the valve body 31 by the fixing glue.

[0040] In this embodiment, a gap is left between the patch 32 and the valve body 31 by cutting the glue or setting micropores on the fixing glue. The patch 32 can prevent foreign matter from entering the explosion-proof valve 3. At the same time, the installation method with a gap is convenient for helium inspection. The helium inspection can detect the installation reliability of the explosion-proof valve 3, thereby improving the safety of the battery.

[0041] Preferably, the plane where the first step body 1112 is located is perpendicular to the plane where the second step body 1113 is located, and the third step body 1114 is perpendicular to the plane where the second step body 1113 is located. The first step body 1112 and the second step body 1113 form a first space, and the first space is used to install the valve body 31. The depth of the first space in the height direction is greater than or equal to the thickness of the valve body 31; the second step body 1113 and the third step body 1114 form a second space, and the second space is used to paste the patch 32. The depth of the second space in the height direction is greater than or equal to the thickness of the patch 32. The setting of the first space and the second space meets the installation requirements while ensuring the flatness of the shell bottom plate 1.

[0042] Preferably, the first step body 1112 is provided with at least one hole, the penetration direction of the hole is perpendicular to the height direction of the battery shell, and the hole increases the circulation area of ​​the internal gas to ensure the realization of the pressure relief and explosion-proof function of the explosion-proof valve 3.

[0043] Preferably, the first step body 1112 and the support portion 12 are located in the same horizontal plane, and the depression formed between the support portion 12 and the step portion 1111 forms a gas channel 112, and the gas channel 112 is used for the circulation of battery gas; the plate body 11 also includes a welding portion 113, and the welding portion 113 is arranged in the area between the protrusion and the shell side wall 2, and the welding portion 113 is used for welding the shell bottom plate 1 and the pole ear or the collecting plate.

[0044] Preferably, the support portion 12 is configured as a plurality of fan-ring structures with equal centers and radii, the plurality of support portions 12 are arranged around the mounting hole 111, the plurality of support portions 12 are spaced apart, and the intervals between the plurality of support portions 12 are connected to the gas channel 112, thereby increasing the area of ​​the gas flowable region and further ensuring the fluidity of the battery gas.

[0045] In this embodiment, the support portion 12 can support the pole ear or collecting plate installed corresponding to the explosion-proof valve 3 while isolating the two, which can not only ensure the function of the explosion-proof valve 3, but also avoid the heat transfer to the pole ear during welding, thereby reducing the possibility of damage to the pole ear; in addition, the support portion 12 can increase the strength and rigidity of the battery shell without increasing the thickness of the shell side wall 2, thereby avoiding deformation of the battery shell, saving material usage, reducing weight, and reducing costs.

[0046] Implementation Method 2

[0047] Different from the first embodiment, the support portion 12 in this embodiment is configured as a circular ring structure, and the support portion 12 is arranged around the mounting hole 111. The circular ring structure further increases the isolation effect and support effect between the explosion-proof valve 3 and the correspondingly installed pole ear or collecting plate, thereby preventing heat transfer during welding.

[0048] The other structures are the same as those in the first embodiment and will not be described again here.

[0049] Implementation Method 3

[0050] Different from the first embodiment, in this embodiment, both the support portion 12 and the first step body 1112 are provided with transversely penetrating holes, which further increases the area for gas circulation, reduces a part of the weight, and improves the performance of the cylindrical battery.

[0051] The other structures are the same as those in the first embodiment and will not be described again here.

[0052] Battery

[0053] Including the above-mentioned battery housing, the battery can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. In the battery assembly process of the utility model, the mounting hole 111 can be used to inject electrolyte, which reduces the production and installation of parts such as sealing nails and injection holes, simplifies the production process, and reduces the difficulty of assembly.

[0054] Electrical devices

[0055] Including the above-mentioned battery, the power-consuming device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned power-consuming devices.

[0056] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A battery housing, characterized in that: The invention comprises a housing bottom plate (1) and a housing side wall (2) connected to the housing bottom plate (1), wherein the housing bottom plate (1) is provided with an explosion-proof valve (3), and the housing bottom plate (1) comprises: A plate body (11), wherein a mounting hole (111) is provided at the center of the plate body (11), and the mounting hole (111) is used for mounting the explosion-proof valve (3); A support portion (12), the support portion (12) being arranged as a protrusion formed upwardly by the plate body (11) along a height direction of the battery housing; A step portion (1111) is provided on the inner peripheral side of the mounting hole (111), and the step portion (1111) is provided with a continuous first step body (1112), a second step body (1113) and a third step body (1114), wherein the first step body (1112) is located on a side of the plate body (11) away from the shell side wall (2), and the third step body (1114) is located on a side of the plate body (11) close to the shell side wall (2).

2. The battery case according to claim 1, characterized in that: The explosion-proof valve (3) comprises a valve body (31) and a patch (32); a fixing glue is provided on a side of the patch (32) close to the valve body (31); and the patch (32) is adhered to the valve body (31) by the fixing glue.

3. The battery case according to claim 2, characterized in that: The first step body (1112) and the support portion (12) are located in the same horizontal plane, the plane where the first step body (1112) is located is perpendicular to the plane where the second step body (1113) is located, and the plane where the third step body (1114) is located is perpendicular to the plane where the second step body (1113) is located.

4. The battery case according to claim 3, characterized in that: The first step body (1112) is provided with at least one hole, and the penetration direction of the hole is perpendicular to the height direction of the battery housing.

5. The battery case according to claim 3, characterized in that: The first step body (1112) and the second step body (1113) form a first space, the first space is used to install the valve body (31), and the depth of the first space in the height direction is greater than or equal to the thickness of the valve body (31).

6. The battery case according to claim 3, characterized in that: The second step body (1113) and the third step body (1114) form a second space, the second space is used for pasting the patch (32), and the depth of the second space in the height direction is greater than or equal to the thickness of the patch (32).

7. The battery case according to claim 1, characterized in that: The plate body (11) has a gas channel (112), and the gas channel (112) is arranged as a recess formed between the support portion (12) and the step portion (1111).

8. The battery case according to claim 1, characterized in that: The plate body (11) further comprises a welding portion (113), wherein the welding portion (113) is arranged in a region between the protrusion and the shell side wall (2).

9. The battery case according to claim 1, characterized in that: The support portion (12) is configured as a circular ring structure, and the support portion (12) is disposed around the mounting hole (111).

10. The battery case according to claim 1, characterized in that: The support portion (12) is arranged as a plurality of fan-ring structures with equal centers and radii, the plurality of support portions (12) are arranged around the mounting hole (111), and the plurality of support portions (12) are arranged at intervals.

11. A battery, characterized in that: A battery casing comprising the battery casing according to any one of claims 1 to 10.

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