Battery shell with anti-explosion valve structure and battery

Abstract

The utility model discloses a battery shell with an anti-explosion valve structure and a battery adopting the battery shell. A battery shell with an anti-explosion valve structure comprises a battery shell body, a first groove and an anti-explosion nick groove, a containing cavity is formed in the battery shell body, and the first groove is formed in the outer surface of the bottom of the battery shell body; the anti-explosion nick groove is formed in the groove bottom wall of the first groove; the first groove is formed in one side, deviating from the bottom center of the battery shell body, of the bottom outer surface of the battery shell body. Due to the fact that the first groove is eccentrically formed in one side of the center of the bottom of the battery shell body, the connecting piece can be directly welded to the center of the outer surface of the bottom of the battery shell, the connecting piece and the battery shell do not need to be positioned and calibrated again, and the welding efficiency of the connecting piece and the battery shell is improved; and the connecting sheet cannot be welded and covered on the explosion-proof valve structure, so that the detonation pressure of the explosion-proof valve structure cannot be influenced, and the normal use of the exhaust and pressure relief functions of the battery shell can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially a battery shell with explosion -proof valve structure and the battery of using this battery shell. BACKGROUND

[0002] With the development of the times and the continuous progress of science and technology, new energy vehicles are more and more popular, and the most important energy storage device of new energy vehicles is battery. The existing battery generally adopts the following structure, including battery shell and electric core, the inside of battery shell is provided with accommodating cavity, the side wall of battery shell is provided with inlet and outlet which is communicated with accommodating cavity, electric core passes through inlet and outlet and is placed in the inside of accommodating cavity of battery shell, battery cover plate assembly is installed at inlet and outlet, battery cover plate assembly can seal inlet and outlet of battery shell, so that accommodating cavity forms a sealed cavity. Although the battery is a kind of device with relatively stable performance, due to the fact that the accommodating cavity is loaded with electrolyte and other chemical substances, when the battery is impacted under certain conditions, the electrolyte in the accommodating cavity reacts violently, which leads to 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 explosion-proof valve will tear when the pressure exceeds the pressure that the explosion-proof valve can withstand, thereby relieving the pressure inside the battery shell and avoiding the explosion of the battery. The existing battery achieves the purpose of preventing the explosion of the battery by setting an explosion-proof valve on the battery cover plate assembly. However, the preparation of the explosion-proof valve on the battery cover plate assembly is difficult, which leads to a low yield and high production cost of the battery cover plate assembly.

[0003] Therefore, some batteries with explosion-proof valve structure on the bottom wall of the battery shell have appeared on the market. These batteries generally use an aluminum battery shell formed by conventional cold extrusion, and the explosion-proof valve structure is provided at the central position of the outer surface of the bottom of the aluminum battery shell. Although the battery with the above structure can meet the explosion-proof requirements, it is convenient for production and helps to reduce production costs.

[0004] However, the energy storage device used by the new energy vehicle is generally a battery containing a plurality of the above structures, and when manufacturing the energy storage device of the new energy vehicle, a connecting piece is needed to weld a plurality of batteries in series or in parallel. When the explosion-proof valve structure is designed in the center of the bottom surface, because the explosion-proof valve structure needs a thinner base material, the thickness of the bottom of the aluminum battery shell of the battery is generally 0.15-0.25 mm, and if the connecting piece is directly welded in the center of the bottom of the aluminum battery shell, the welding pool will directly penetrate the bottom of the aluminum battery shell, resulting in the loss of sealing performance of the bottom of the aluminum battery shell. In addition, if the connecting piece is directly welded in the position of the explosion-proof valve structure in the center of the bottom of the aluminum battery shell, the explosion pressure of the explosion-proof valve structure will be affected, and the exhaust pressure relief function will be lost. However, if the connecting piece is welded away from the central position of the bottom of the aluminum battery shell, the position of the connecting piece and the aluminum battery shell needs to be re-adjusted before each welding to position, which will increase the welding time, greatly reducing the welding efficiency of the battery and the connecting piece, and further affecting the production efficiency of the energy storage device. Practical new type content

[0005] The utility model discloses at least one of the technical problems existing in the prior art. To this end, the utility model discloses a first aspect of a battery shell body with explosion-proof valve structure, which helps to shorten the welding time of the battery shell body and the connecting piece. The utility model discloses a second aspect of a battery using the above battery shell body, which helps to shorten the welding time of the battery shell body and the connecting piece, and improve the welding efficiency of the battery and the connecting piece.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0007] According to the battery shell body with explosion-proof valve structure of some embodiments of the utility model, the battery shell body includes a battery shell body, a first groove and an explosion-proof notch groove, the inside of the battery shell body is provided with a containing cavity, and the upper part of the battery shell body is provided with an inlet and outlet in communication with the containing cavity. The first groove is arranged on the outer surface of the bottom of the battery shell body, and the first groove is recessed in the direction from the outer surface of the bottom of the battery shell body to the inside of the containing cavity. The explosion-proof notch groove is arranged on the groove bottom wall of the first groove, and the explosion-proof notch groove is recessed in the direction from the groove bottom wall of the first groove to the inside of the containing cavity. The first groove is located on one side of the outer surface of the bottom of the battery shell body deviated from the center of the bottom of the battery shell body.

[0008] The battery shell of some embodiments of the utility model has the advantages that: the battery shell of the embodiment is provided with a first groove on one side of the bottom center of the battery shell body, and the first groove and the explosion-proof notch groove form an explosion-proof valve structure, which can tear the bottom wall of the battery shell and release pressure when the pressure inside the battery shell reaches the detonation pressure value, thereby meeting the requirement of enterprises on the explosion-proof performance of the battery shell.

[0009] In some embodiments of the utility model, the distance between the outer periphery of the first groove and the center of the bottom of the battery shell body is L1, and L1>5mm.

[0010] In some embodiments of the utility model, the first groove is a circular groove, and the diameter of the first groove gradually decreases along the direction from the outer surface of the bottom of the battery shell body to the inside of the accommodating cavity.

[0011] In some embodiments of the utility model, the angle between the side wall of the first groove and the horizontal plane is R, and 22°<R<45°.

[0012] In some embodiments of the utility model, the cross-sectional shape of the explosion-proof notch groove is polygonal.

[0013] In some embodiments of the utility model, the cross-sectional shape of the explosion-proof notch groove is trapezoidal, the bottom edge of the trapezoid close to the accommodating cavity is the lower bottom edge, the bottom edge of the trapezoid away from the accommodating cavity is the upper bottom edge, and the length of the upper bottom edge is greater than the length of the lower bottom edge.

[0014] In some embodiments of the utility model, the battery shell body is an aluminum shell.

[0015] In some embodiments of the utility model, the battery shell body is an internally hollow cylindrical shell.

[0016] In some embodiments of the utility model, the distance between the first groove outer periphery and the battery shell body outside lateral wall is L2, and 2.08mm < L2 < 2.73mm is met.

[0017] According to the battery of some embodiments of the utility model, the electric core is arranged inside the accommodating cavity.

[0018] The battery of some embodiments of the utility model has the beneficial effects that: the battery of the embodiment adopts the above-mentioned battery shell, which is convenient for welding of the connecting piece and the battery, improves the welding efficiency of the connecting piece and the battery, does not affect the explosion-proof performance of the battery, and meets the needs of enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described in detail in combination with the drawings and specific embodiments.

[0020] Figure 1 It is the appearance structure schematic diagram of the battery shell of some embodiments of the utility model;

[0021] Figure 2 It is Figure 1 It is the bottom structure schematic diagram of the battery shell shown;

[0022] Figure 3 It is Figure 1 It is the internal structure sectional view of the battery shell shown;

[0023] Figure 4 It is Figure 3 It is the enlarged schematic diagram of A in the middle;

[0024] Figure 5 It is Figure 4 It is the enlarged schematic diagram of B in the middle. DETAILED DESCRIPTION

[0025] This part will describe the specific embodiments of the utility model in detail, and the preferred embodiments of the utility model are shown in the drawings, and the drawings are used to supplement the description of the text part in the form of 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 the limitation of the protection scope of the utility model.

[0026] In the description of the utility model, it should be understood that the position description such as the position or location relationship indicated by up, down, front, back, left, right and the like is based on the position or location relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific position, a specific position and operation, so it cannot be understood as the limitation of the utility model.

[0027] In the description of the utility model, if several meanings are one or more, the meaning of multiple is more than three, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described to the first, second and the like, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0028] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, 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.

[0029] Referring to Figures 1 to 5 , the utility model discloses a battery shell with explosion-proof valve structure, in order to facilitate the description, sometimes below is simply referred to as "battery shell". A battery shell with explosion-proof valve structure includes battery shell body 100, the inside of battery shell body 100 is provided with containing cavity 110, the upper portion of battery shell body 100 is provided with the import and export 120 that communicates with containing cavity 110, the outer surface of the bottom of battery shell body 100 is provided with first recess 200, first recess 200 is recessed along the direction from the outer surface of the bottom of battery shell body 100 to the inside of containing cavity 110, and then the thickness of battery shell body 100 corresponding to first recess 200 is smaller than the thickness of other positions, that is, first recess 200 is the thickness thinning area of the bottom surface of battery shell, the groove bottom wall of first recess 200 is provided with explosion-proof score groove 300, explosion-proof score groove 300 is recessed along the direction from the groove bottom wall of first recess 200 to the inside of containing cavity 110, wherein, first recess 200 is located on the one side of the bottom center of battery shell body 100 deviating from the bottom surface of battery shell body 100.

[0030] The battery shell of the embodiment is provided with the first groove 200 on one side of the bottom center of the battery shell body 100, and the first groove 200 and the explosion-proof notch groove 300 form an explosion-proof valve structure. When the pressure inside the battery shell reaches the explosion pressure value, the explosion-proof valve structure formed by the first groove 200 and the explosion-proof notch groove 300 can tear the bottom wall of the battery shell and release pressure, meeting the requirements of enterprises on the explosion-proof performance of the battery shell. In addition, the first groove 200 is eccentrically arranged on one side of the bottom center of the battery shell body 100, so that when the external connecting sheet is welded and fixed to the battery shell, the connecting sheet can be directly welded at the center position of the bottom outer surface of the battery shell, without the need for positioning and calibration of the connecting sheet and the battery shell. The technical problem of positioning and calibration of the connecting sheet and the battery shell in the prior art is solved, the welding efficiency of the connecting sheet and the battery shell is improved, and in addition, the connecting sheet does not cover the explosion-proof valve structure, so the explosion pressure of the explosion-proof valve structure is not affected, and the exhaust pressure relief function of the battery shell can be normally used.

[0031] With reference to Figure 2 and Figure 3 , in order to better weld the connecting sheet to the battery shell, in some embodiments of the utility model, the first groove 200 is eccentrically arranged on one side of the bottom center of the battery shell body 100, and the first groove 200 is a certain distance from the bottom center of the battery shell body 100. In the embodiment, the distance between the outer periphery of the first groove 200 and the bottom center of the battery shell body 100 is L1, and L1>5mm. By adopting the above structure, the first groove 200 is offset from the bottom center of the battery shell body 100, which facilitates better welding of the connecting sheet to the battery shell. In addition, by adopting the above structure, the bottom center of the battery shell body 100 has a blank area with a diameter of more than 10mm, so the welding area of the connecting sheet and the battery shell body 100 is a circular area with a diameter of more than 10mm. Therefore, the connecting sheet and the battery shell body 100 have sufficient contact area, ensuring that the connecting sheet and the battery shell have sufficient conductivity.

[0032] With reference to Figures 1 to 3, in order to facilitate the production and processing of the battery shell, in some embodiments of the utility model, the battery shell body 100 is a hollow cylindrical shell, by setting up the battery shell body 100 cylindrical, it is convenient to adopt extruding machine extrusion forming to obtain the battery shell body 100, further, the battery shell body 100 and the first recess 200 are integrally extruded, the battery shell of this embodiment is extruded by the structure of integrally extruding the battery shell body 100 and the first recess 200, so when producing the battery shell, it can be directly integrally formed by extruding machine, and the production and processing are more convenient, which helps to reduce the production cost.

[0033] It should be noted that, in the above embodiment, the shape of the battery shell body 100 is cylindrical, and 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, which can be determined according to actual needs.

[0034] Further, the battery shell body 100 is an aluminum shell, that is, the extrusion machine is used to extrude aluminum to form the required battery shell body 100, which not only facilitates processing, but also prevents the battery shell body 100 from breaking, and at the same time, the battery shell has good electrical conductivity, in addition, the production cost of the battery shell can be reduced.

[0035] Referring to Figures 2 to 5 , in order to facilitate the extrusion forming of the first recess 200, in some embodiments of the utility model, the first recess 200 is a circular recess, and the diameter of the first recess 200 gradually decreases along the direction from the outer surface of the bottom of the battery shell body 100 to the inside of the accommodating cavity 110. By adopting the above structure, the first recess 200 is in a horn-shaped structure with a large outer diameter and a small inner diameter, which facilitates the extrusion of the extrusion machine to form the above-mentioned first recess 200, and the extrusion processing is simple and convenient, and the quality is good.

[0036] In some embodiments of the utility model, the included angle between the side wall of the first recess 200 and the horizontal plane is R, which satisfies 22° < R < 45°. By adopting the above structure, an inclined angle is formed between the side wall of the first recess 200 and the horizontal plane, which can guide the flow of the extrusion-formed metal material when the extrusion machine extrusion-forms the battery shell body 100, and can also reduce the resistance of the metal material flow. The metal material can be quickly introduced to the outside of the explosion-proof valve structure along the above-mentioned inclined angle, thereby solving the problem of cutting off the metal material flow path, and further improving the lack of material and wrinkling problems caused by cutting off the metal material flow path, greatly improving the extrusion forming quality of the battery shell.

[0037] In some embodiments of the utility model, the section shape of the explosion-proof score groove 300 is polygon, by the section shape of the explosion-proof score groove 300 is polygon, therefore the corner of explosion-proof score groove 300 is sharp angle, when the inside of battery shell is impacted by air pressure, the corner position of explosion-proof score groove 300 produces tearing as tearing point, thereby the groove bottom of first recess 200 is torn to form pressure relief port, realize smaller explosion-proof pressure value control and smaller explosion-proof pressure fluctuation value control, satisfy the explosion-proof pressure control requirement of enterprise to battery shell.In this embodiment, the section shape of explosion-proof score groove 300 is trapezoidal, the bottom edge of trapezoidal close to containing cavity 110 is lower bottom edge, the bottom edge of trapezoidal far from containing cavity 110 is upper bottom edge, and the length of upper bottom edge is greater than the length of lower bottom edge.By the section shape of explosion-proof score groove 300 is trapezoidal, it is convenient for enterprise to adopt extrusion or cutting mode and process the required explosion-proof score groove 300 in the groove bottom wall of first recess 200.Processing is more convenient and fast.

[0038] It should be noted that, in the above embodiment, the section shape of the explosion-proof score groove 300 is trapezoidal, and in some embodiments of the utility model, the section shape of the explosion-proof score groove 300 can be triangular or pentagonal or hexagonal, etc., which can be determined according to actual needs, and is not limited to the above-mentioned trapezoidal.

[0039] Referring to Figures 3 to 5 In some embodiments of the utility model, the distance between the outer periphery of the first recess 200 and the outer side wall of the battery shell body 100 is L2, which satisfies 2.08mm < L2 < 2.73mm. By adopting the above structure, a distance for material flow and recoil is reserved between the first recess 200 and the outer side wall of the battery shell body 100. When the enterprise uses an extrusion device to extrude the battery shell body 100, the metal material flows through the thinned position of the first recess 200 and then reassembles at the buffer position between the first recess 200 and the outer side wall of the battery shell body 100. The metal material then flows towards the outer side wall of the battery shell body 100 after turning at the circular arc chamfer of the bottom wall and the outer side wall of the battery shell body 100, ensuring that the circular arc chamfer of the bottom wall and the outer side wall of the battery shell body 100 and the outer side wall of the battery shell body 100 are full of material and do not have an edge material shortage phenomenon, greatly improving the quality of the extrusion molding of the battery shell.

[0040] Referring to Figures 1 to 5The utility model discloses a battery of some embodiments, including electric core and above-mentioned battery shell, and electric core sets up in the accommodation cavity 110 inside. It needs to explain, and electric core can be composed of electrode assembly and electrolyte, wherein, electrode assembly is composed of positive pole sheet, negative pole sheet, the diaphragm of setting between positive pole sheet and negative pole sheet, and electric core mainly relies on the movement of metal ion (for example lithium ion) between positive pole sheet and negative pole sheet to provide electric energy. By the electric core for the known technology in the art, here no longer elaborates.

[0041] The battery of the embodiment improves the welding efficiency of the connecting piece and the battery by adopting the above-mentioned battery shell, and meanwhile, does not affect the explosion-proof performance of the battery, and meets the needs of enterprises.

[0042] The utility model has been described in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by ordinary skilled persons in the technical field without departing from the purpose of the utility model.

Claims

1. A battery case having an explosion-proof valve structure, characterized by comprising: The battery shell body (100) is internally provided with a containing cavity (110), and an inlet and outlet (120) is formed in the upper portion of the battery shell body (100) and communicates with the containing cavity (110); A first groove (200) is arranged on the outer surface of the bottom of the battery shell body (100), and the first groove (200) is recessed in the direction from the outer surface of the bottom of the battery shell body (100) to the inside of the containing cavity (110); An explosion-proof notch groove (300) is formed in the groove bottom wall of the first groove (200), and the explosion-proof notch groove (300) is recessed in the direction from the groove bottom wall of the first groove (200) to the inside of the containing cavity (110); The first groove (200) is located on one side of the outer surface of the bottom of the battery shell body (100) and deviates from the center of the bottom of the battery shell body (100).

2. The battery shell with an explosion-proof valve structure according to claim 1, wherein the distance between the outer periphery of the first groove (200) and the center of the bottom of the battery shell body (100) is L1, and L1>5mm.

3. The battery shell with an explosion-proof valve structure according to claim 2, wherein the first groove (200) is a circular groove, and the diameter of the first groove (200) gradually decreases in the direction from the outer surface of the bottom of the battery shell body (100) to the inside of the containing cavity (110).

4. The battery shell with an explosion-proof valve structure according to claim 3, wherein the included angle between the side wall of the first groove (200) and the horizontal plane is R, and 22° 5. The battery shell with an explosion-proof valve structure according to claim 1, wherein the cross-sectional shape of the explosion-proof notch groove (300) is a polygon. The cross-sectional shape of the explosion-proof notch groove (300) is a trapezoid, the bottom edge of the trapezoid close to the containing cavity (110) is a lower bottom edge, the bottom edge of the trapezoid away from the containing cavity (110) is an upper bottom edge, and the length of the upper bottom edge is greater than the length of the lower bottom edge.

7. The battery shell with an explosion-proof valve structure according to claim 1, wherein the battery shell body (100) is an aluminum shell.

8. The battery shell with an explosion-proof valve structure according to claim 1, wherein the battery shell body (100) is an internally hollow cylindrical shell.

9. The battery shell with an explosion-proof valve structure according to claim 1, wherein the distance between the outer periphery of the first groove (200) and the outer side wall of the battery shell body (100) is L2, and 2.08mm The battery shell body (100) is internally provided with a containing cavity (110), and an inlet and outlet (120) is formed in the upper portion of the battery shell body (100) and communicates with the containing cavity (110); 6. The battery case having an explosion-proof valve structure according to claim 5, wherein ​ ​ ​ ​ ​ ​ ​ 10. A battery, characterized by ​

Images