Battery shell and battery
By integrally extruding the battery casing and forming explosion-proof grooves in local areas, the problems of difficult and costly preparation of the explosion-proof valve structure of the battery casing are solved, achieving low-cost production and stable explosion-proof pressure control.
Patent Information
- Application Number
- CN202423239239.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-26
AI Technical Summary
The existing battery casings present challenges in manufacturing explosion-proof valve structures, including high manufacturing difficulty, low yield, and high production costs. Furthermore, CNC machining centers cannot be used in vibrating environments, resulting in large machining errors that affect the normal operation of the explosion-proof valve.
The battery casing and the first groove are integrally extruded. By forming explosion-proof grooves in local areas of the battery casing, the extruder directly forms the grooves, avoiding CNC machining, reducing production costs and ensuring consistent groove bottom wall thickness. The corners of the explosion-proof grooves are designed as sharp corners to facilitate tearing and pressure relief.
This enables low-cost production of battery casings, ensures stable control and minimal fluctuations in explosion-proof pressure values, meets the explosion-proof pressure control requirements of enterprises, and reduces battery production costs.
Smart Images
Figure CN223956755U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery field, especially a battery shell and a battery using the battery shell. BACKGROUND
[0002] It is known that with the development of society and the continuous progress of science and technology, new energy vehicles are more and more popular, wherein the most important energy storage device of new energy vehicles is a battery, and the battery is a device for converting chemical energy into electrical energy. The existing battery generally adopts the following structure, including a battery shell and a battery core, the inside of the battery shell is provided with a containing cavity, the side wall of the battery shell is provided with an inlet and outlet communicated with the containing cavity, the battery core passes through the inlet and outlet and is placed in the containing cavity of the battery shell, a battery cover plate assembly is installed at the inlet and outlet, the battery cover plate assembly can seal the inlet and outlet of the battery shell, so that the containing cavity forms a sealed cavity.
[0003] Although the battery is a device with relatively stable performance, the containing cavity is loaded with chemical substances such as electrolyte, in some cases, the electrolyte in the containing cavity reacts violently, resulting in a substantial increase in the pressure inside the battery shell. In order to avoid the explosion of the battery shell due to the pressure inside the battery shell, the existing battery generally has an explosion-proof valve on the battery cover plate assembly, when the pressure inside the battery shell reaches a preset value, the pressure exceeds the pressure that the explosion-proof valve can withstand, the explosion-proof valve will tear, thereby relieving the pressure inside the battery shell, thereby avoiding the explosion of the battery. The existing battery realizes the purpose of preventing the explosion of the battery by adopting the structure of setting the explosion-proof valve on the battery cover plate assembly, but the preparation difficulty of setting the explosion-proof valve on the battery cover plate assembly is large, thereby leading to low yield and high production cost of the battery cover plate assembly.
[0004] Therefore, some batteries with explosion-proof valve structure arranged on the bottom wall of the battery shell appear in the market, which generally adopts an aluminum battery shell. The thickness of the bottom surface of the aluminum battery shell is large due to structural limitations, and is generally above 0.8 mm. The explosion-proof valve structure arranged on the bottom wall of the battery shell needs to thin the thickness of the bottom wall of the battery shell to the range of 0.15-0.25 mm. Due to the large compression ratio, the conventional method is to process the explosion-proof valve structure by CNC, that is, to cut the bottom surface of the aluminum battery shell by CNC, so as to thin the bottom surface of the aluminum battery shell and form the explosion-proof valve structure. However, due to the CNC processing, the battery shell needs to be clamped on the CNC machining center, and the clamping error fluctuation of the battery shell is above 0.020 mm. The CNC machining center also produces a machining error fluctuation of above 0.025 mm during the machining process, so that the thickness fluctuation of the explosion-proof valve structure processed by the CNC center can be up to 0.045 mm. If the machining error fluctuation deviates to the thick direction, the explosion-proof valve structure cannot normally exhaust and depressurize at the rated pressure value due to the excessive thickness of the explosion-proof valve structure. When the machining error fluctuation deviates to the thin direction, the explosion-proof valve structure will exhaust and depressurize in advance due to the excessive thinness of the explosion-proof valve structure when the pressure value does not reach the rated pressure, so as to cause the battery to be damaged in advance.
[0005] In addition, since the aluminum shell is generally formed by cold extrusion of aluminum material by an extruder, the extruder will produce vibration during the extrusion process. The CNC machining center cannot be arranged in the vibration environment due to the requirements of precision and the machine itself. Therefore, when the CNC is used to process the explosion-proof valve structure on the battery shell, an isolation needs to be arranged between the extruder and the CNC center, and full-automatic transfer, clamping of the aluminum battery shell and the like cannot be realized between the extruder and the CNC center. Therefore, when the CNC machining center is used to process the explosion-proof valve structure of the aluminum battery shell, special personnel for carrying, feeding and discharging and the like need to be added, so as to greatly increase the production cost of the product. Practical new type content
[0006] The present utility model aims at solving at least one of the technical problems existing in the prior art. To this end, the present utility model provides a battery shell in the first aspect, which is convenient for producing and processing the explosion-proof valve structure, and helps to reduce the production cost of the battery shell. The present utility model provides a battery using the above battery shell in the second aspect, which can reduce the production cost of the battery and enhance the social competitiveness of enterprises.
[0007] In order to solve the above technical problems, the present utility model adopts the following technical solutions:
[0008] According to the battery shell of some embodiments of the utility model, including battery shell body, first recess and anti -explosion score groove, the inside of battery shell body is provided with containing chamber, the lateral wall of battery shell body is provided with with containing chamber The import and export that links and communicates of first recess is set up, first recess is set up in the lateral wall of battery shell body, and first recess is recessed along by containing chamber outside to containing chamber inside direction, anti -explosion score groove is set up in the groove bottom wall of first recess, anti -explosion score groove is recessed along by containing chamber outside to containing chamber inside direction, the cross -section shape of anti -explosion score groove is polygon, wherein, battery shell body and first recess are integrative extrusion forming.
[0009] The battery shell of some embodiments of the utility model has the beneficial effects that: the battery shell of the embodiment adopts the structure that the battery shell body and the first recess are integrally extruded, so that the battery shell body and the first recess can be directly integrally extruded by using an extruder when the battery shell is produced, the traditional method of cold extrusion forming the battery shell body by using an extruder and machining the first recess on the outer surface of the lateral wall of the battery shell body by using a CNC machining center is abandoned, the technical problem of large thickness fluctuation of the groove bottom wall of the first recess caused by machining the first recess by using the CNC machining center is solved, the thickness of the first recess of the battery shell of the embodiment is basically consistent and has small fluctuation, manual moving and feeding of the CNC machining center by workers are not needed, the production cost of the battery shell of the embodiment is greatly reduced, in addition, the groove bottom wall of the first recess is provided with the anti-explosion score groove, the cross-section shape of the anti-explosion score groove is polygon, the corners of the anti-explosion score groove are sharp corners, when the inside of the containing chamber is impacted by air pressure, the corner position of the anti-explosion score groove serves as a tearing point to generate tearing, so that the bottom of the first recess is torn to form a pressure relief port, the control of a smaller anti-explosion pressure value and the control of a smaller anti-explosion pressure fluctuation value are realized, and the anti-explosion pressure control requirements of enterprises on the battery shell are met.
[0010] In some embodiments of the utility model, the first recess is a circular recess, and the diameter of the first recess gradually decreases along the direction from the outside of the containing chamber to the inside of the containing chamber.
[0011] In some embodiments of the utility model, the diameter of the groove bottom wall of the first recess is D, and 9.6mm≤D≤10.5mm is met.
[0012] In some embodiments of the utility model, the thickness of the groove bottom wall of the first recess is L, and 0.15mm≤L≤0.25mm is met.
[0013] In some embodiments of the utility model, the cross-section shape of the anti-explosion score groove is trapezoidal or triangular.
[0014] In some embodiments of the utility model, the section shape of the anti -explosion score groove is trapezoidal, the bottom of trapezoidal near the containing cavity is lower bottom, the bottom of trapezoidal far from the containing cavity is upper bottom, the length of upper bottom is greater than the length of lower bottom, wherein the chamfer diameter of one corner of anti -explosion score groove bottom is R, satisfy R < 0.02mm.
[0015] In some embodiments of the utility model, the battery shell body is an aluminum shell.
[0016] In some embodiments of the utility model, the battery shell body is an internally hollow cylindrical shell.
[0017] In some embodiments of the utility model, the first groove is opened in the bottom wall outer surface of the battery shell body.
[0018] According to the battery of some embodiments of the utility model, including electric core and above-mentioned battery shell, the electric core is arranged in the containing cavity.
[0019] The battery of some embodiments of the utility model has the beneficial effects that: the battery of the embodiment greatly reduces the production cost of the battery shell by adopting the above-mentioned battery shell, thereby reducing the production cost of the battery, and realizing the control of smaller anti -explosion pressure value and smaller anti -explosion pressure fluctuation value, which well meets the anti -explosion pressure control requirements of enterprises for the battery. BRIEF DESCRIPTION OF DRAWINGS
[0020] The utility model will be explained further in detail in combination with the drawings and specific embodiment.
[0021] Figure 1 It is the appearance structure schematic drawing of the battery shell of some embodiments of the utility model;
[0022] Figure 2 It is Figure 1 It is the bottom structure schematic drawing of the battery shell shown;
[0023] Figure 3 It is Figure 1 It is the internal structure cutaway view of the battery shell shown;
[0024] Figure 4 It is Figure 3 It is the enlarged schematic drawing of A place in;
[0025] Figure 5 It is Figure 4 It is the enlarged schematic drawing of B place. SPECIFIC EMBODIMENT
[0026] The detailed embodiments of the utility model will be described in this part, the preferred embodiment of the utility model is shown in the drawings, the role of the drawings is to supplement the description of the written part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.
[0027] In the description of the utility model, it needs to be understood that the orientation description such as the orientation or position relationship indicated by up, down, front, back, left, right and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.
[0028] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than three, greater than, less than, more than and the like are not included in the number, above, below and the like are included in the number.If there is a description to the first, the second and the like, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0029] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation and connection should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.
[0030] As described in the background section of the present application, the preparation difficulty in the prior art is large, thereby causing the problems of low yield and high production cost of the battery shell, and it is found through research that the explosion-proof valve of the battery in the prior art generally adopts the following structure, that is, a punching machine is used to punch and process the required explosion-proof sheet, then an explosion-proof hole is processed on the surface of the battery cover plate, and finally a laser welding device is used to seal and weld the explosion-proof sheet at the peripheral surface of the explosion-proof hole.The explosion-proof valve structure has high requirements for the punching quality of the explosion-proof sheet and the welding quality of the explosion-proof sheet welded on the explosion-proof hole, thereby causing high production cost of the explosion-proof valve structure, and low good product rate of the product, which cannot meet the production demand of enterprises.
[0031] In view of the above technical problems, the battery shell provided in the embodiments of the present application is formed by locally extruding part of the battery shell, thinning the thickness of the locally extruded area of the battery shell, forming a thickness reduction area, and then forming an explosion marking groove on the thickness reduction area as an explosion-proof valve of the battery shell.When the pressure in the battery shell is greater than a preset value, the explosion marking groove will burst to release the pressure inside the battery shell, thereby avoiding the explosion of the battery.
[0032] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.
[0033] With reference to Figures 1 to 5 The battery shell body of some embodiments of the utility model for the convenience of description, sometimes referred to below as "battery shell body". A battery shell body includes battery shell body 100, first recess 200 and explosion-proof score groove 300. The battery shell body 100 is internally provided with containing cavity 110, containing cavity 110 is used for accommodating the battery cell, the side wall of battery shell body 100 is provided with the import and export 120 communicated with containing cavity 110;First recess 200 is set up in the outer side wall of battery shell body 100, and first recess 200 is recessed along the direction from the outside of containing cavity 110 to the inside of containing cavity 110, that is, the thickness of the first recess 200 is the thickness reduction area of the side wall of battery shell body 100, the thickness of the groove bottom wall of first recess 200 is less than the thickness of other positions of the side wall of battery shell body 100. The groove bottom wall of first recess 200 is provided with explosion-proof score groove 300, and the explosion-proof score groove 300 is recessed along the direction from the outside of containing cavity 110 to the inside of containing cavity 110, and the cross-sectional shape of the explosion-proof score groove 300 is polygonal;In the embodiment, the battery shell body 100 and first recess 200 are integrally extruded.
[0034] The battery shell body 100 and the first groove 200 are integrally extruded in the battery shell body of the embodiment, so that the battery shell body can be directly integrally extruded by an extruder during production of the battery shell, the traditional method of cold extrusion of the battery shell body by the extruder and machining of the first groove 200 on the outer surface of the side wall of the battery shell body 100 by a CNC machining center is abandoned, the technical problem of large thickness fluctuation of the groove bottom wall of the first groove 200 caused by machining of the first groove 200 by the CNC machining center is solved, the thickness of the groove bottom wall of the first groove 200 of the battery shell of the embodiment is basically uniform and has small fluctuation, manual moving and feeding of the CNC machining center by workers is not needed, the production cost of the battery shell of the embodiment is greatly reduced, and in addition, the groove bottom wall of the first groove 200 is provided with the anti-explosion score groove 300, the cross-sectional shape of the anti-explosion score groove 300 is polygonal, the corners of the anti-explosion score groove 300 are sharp, the corners of the anti-explosion score groove 300 are torn as tear points when the internal cavity is impacted by air pressure, the bottom of the first groove 200 is torn to form a pressure relief port, smaller anti-explosion pressure value control and smaller anti-explosion pressure fluctuation value control are realized, and the anti-explosion pressure control requirements of enterprises on the battery shell are met.
[0035] With reference to Figures 1 to 3 , in order to facilitate production and processing of the battery shell body 100, in some embodiments of the utility model, the battery shell body 100 is an internally hollow cylindrical shell, the battery shell body 100 is obtained by extrusion molding by an extruder, production and processing are more convenient, and production cost is reduced.
[0036] It should be noted that, in the above embodiments, the shape of the battery shell body 100 is cylindrical, while in other embodiments of the utility model, the shape of the battery shell body 100 is cuboid or spherical or other shapes, and is not limited to the above-mentioned cylindrical shape, and can be determined according to actual needs.
[0037] Further, the battery shell body 100 is an aluminum shell, that is, the required battery shell body 100 is obtained by extrusion molding of aluminum by an extruder, which not only facilitates processing, but also prevents the battery shell body 100 from being easily broken.
[0038] With reference to Figures 2 to 5 , in order to facilitate extrusion molding of the first groove 200, in some embodiments of the utility model, the first groove 200 is a circular groove, and the diameter of the first groove 200 gradually decreases along the direction from the outside of the accommodating cavity 110 to the inside of the accommodating cavity 110. By adopting the above structure, the first groove 200 has a horn-shaped structure with a large outer diameter and a small inner diameter, which facilitates extrusion of the first groove 200 by an extruder, and extrusion processing is simple and convenient, and the quality is good.
[0039] In some embodiments of this utility model, the diameter of the bottom wall of the first groove 200 is D, which satisfies 9.6mm≤D≤10.5mm. By adopting the above structure, the area of the region where the thickness of the first groove 200 is reduced can be effectively controlled, avoiding overload of the extruder when extruding the first groove 200, which could damage the battery casing body 100 or the extruder.
[0040] Furthermore, in order to enable the first groove 200 to tear and release pressure when subjected to air pressure impact inside the battery casing 100, in some embodiments of this utility model, the thickness of the bottom wall of the first groove 200 is L, satisfying 0.15mm≤L≤0.25mm. By adopting the above structure, the battery casing 100 can release air pressure at the rated pressure value.
[0041] In order to enable the explosion-proof groove 300 to tear and release pressure when subjected to air pressure impact, in some embodiments of this utility model, the cross-sectional shape of the explosion-proof groove 300 is trapezoidal, with the bottom edge of the trapezoid closer to the receiving cavity 110 being the lower bottom edge, and the bottom edge of the trapezoid farther from the receiving cavity 110 being the upper bottom edge. The length of the upper bottom edge is greater than the length of the lower bottom edge, that is, the explosion-proof groove 300 is a trapezoidal groove that is larger at the top and smaller at the bottom. By adopting the above structure, it is easier to extrude or cut the explosion-proof groove 300, and the processing is simpler and more convenient. In some embodiments of this utility model, the chamfer diameter of one corner of the bottom of the explosion-proof groove 300 is R, which satisfies R < 0.02 mm. By adopting the above structure, the corner of the bottom of the explosion-proof groove 300 is sharper. When the battery casing body 100 is subjected to air pressure impact, the corner of the bottom of the explosion-proof groove 300 is easier to tear and release pressure. As a result, the explosion-proof pressure value of the battery casing can reach a minimum of 1.2 MPa, and the explosion-proof pressure value fluctuates within ±0.3 MPa, which satisfies both the low-pressure valve opening requirement and the stability requirement.
[0042] It should be noted that in the above embodiments, the cross-sectional shape of the explosion-proof groove 300 is trapezoidal. However, in some embodiments of this utility model, the cross-sectional shape of the explosion-proof groove 300 can be triangular, pentagonal, or hexagonal, etc., depending on actual needs, and is not limited to the trapezoidal shape described above.
[0043] In some embodiments of this utility model, the first groove 200 is formed on the outer surface of the bottom wall of the battery case body 100, while the inlet / outlet 120 is formed on the top of the battery case body 100. By adopting the above structure, the structure of the battery case body 100 is more compact and reasonable, which facilitates manufacturing and processing and helps to reduce production costs.
[0044] Reference Figures 1 to 5The battery of some embodiments of the present application comprises a battery shell and an electric core, and the electric core is arranged in the accommodating cavity 110.
[0045] The battery of the present application has the advantages of low production cost of the battery shell, low production cost of the battery, small explosion pressure value control, small explosion pressure fluctuation value control, and high explosion pressure control requirement satisfaction.
[0046] The present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application.
Claims
1. A battery case characterized by comprising: The battery shell body (100) is internally provided with a containing cavity (110), and a side wall of the battery shell body (100) is provided with an inlet and outlet (120) communicating with the containing cavity (110); A first groove (200) is provided on the outer side wall of the battery shell body (100), and the first groove (200) is recessed along the direction from the outside of the containing cavity (110) to the inside of the containing cavity (110); An explosion-proof notch groove (300) is provided on the groove bottom wall of the first groove (200), the explosion-proof notch groove (300) is recessed along the direction from the outside of the containing cavity (110) to the inside of the containing cavity (110), and the cross-sectional shape of the explosion-proof notch groove (300) is polygonal; The battery shell body (100) and the first groove (200) are integrally extruded. The first groove (200) is a circular groove, and the diameter of the first groove (200) gradually decreases along the direction from the outside of the containing cavity (110) to the inside of the containing cavity (110).
2. A battery case according to claim 1, wherein The diameter of the groove bottom wall of the first groove (200) is D, and 9.6mm≤D≤10.5mm is satisfied.
3. A battery case according to claim 2, wherein The thickness of the groove bottom wall of the first groove (200) is L, and 0.15mm≤L≤0.25mm is satisfied.
4. A battery case according to claim 3, wherein The cross-sectional shape of the explosion-proof notch groove (300) is trapezoidal or triangular.
5. The battery case of claim 1, wherein The cross-sectional shape of the explosion-proof notch groove (300) is trapezoidal, the bottom edge of the trapezoid close to the containing cavity (110) is the lower bottom edge, the bottom edge of the trapezoid away from the containing cavity (110) is the upper bottom edge, the length of the upper bottom edge is greater than the length of the lower bottom edge, wherein the chamfer diameter of one corner of the bottom of the explosion-proof notch groove (300) is R, and R<0.02mm is satisfied.
6. A battery case according to claim 5, wherein The battery shell body (100) is an aluminum shell.
7. The battery case of claim 1, wherein The battery shell body (100) is an internally hollow cylindrical shell.
8. The battery case of claim 1, wherein 9. The battery shell of claim 1, wherein The first groove (200) is provided on the outer surface of the bottom wall of the battery shell body (100). The battery shell body, the battery shell body comprising a containing cavity (110), an inlet and outlet (120) communicating with the containing cavity (110), a first groove (200) provided on the outer side wall of the battery shell body (100), and the first groove (200) being recessed along the direction from the outside of the containing cavity (110) to the inside of the containing cavity (110), an explosion-proof notch groove (300) provided on the groove bottom wall of the first groove (200), the explosion-proof notch groove (300) being recessed along the direction from the outside of the containing cavity (110) to the inside of the containing cavity (110), and the cross-sectional shape of the explosion-proof notch groove (300) being polygonal.
10. A battery, characterized by