Battery, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, a battery pack and electric equipment, the battery comprises a shell, the outer wall surface of the shell is provided with a groove, the groove bottom surface of the groove is provided with a pressure relief notch groove, so that the groove bottom surface of the groove forms a pressure relief blasting surface, and the groove bottom surface of the pressure relief notch groove is an arc-shaped surface recessed towards the interior of the shell. The groove and the pressure relief notch groove form an explosion-proof structure, and the pressure relief notch is arranged on the groove bottom surface of the groove, so that the groove bottom surface of the groove forms a pressure relief blasting surface, namely, the pressure relief blasting surface of the battery is inwards recessed relative to the outer wall surface of the shell, and therefore, when the battery is collided, the battery firstly collides with the outer wall surface of the battery shell and is not easy to collide with the pressure relief blasting surface; and the structural reliability of the battery is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery, a battery pack and an electrical device. Background Art

[0002] When the battery is in short circuit, overcharge, continuous heating to thermal runaway and other conditions, violent reactions will occur inside, and a large amount of gas will be generated. Therefore, the battery needs to be provided with an explosion-proof structure. When the air pressure inside the battery is too large, the gas inside can be discharged to the outside of the battery through the explosion-proof structure to avoid the explosion and fire of the battery. In the related art, the explosion-proof structure of the battery is a circular pressure relief notch, and the pressure relief notch is arranged on the outer wall surface of the battery. The inner side of the circular pressure relief notch is a pressure relief bursting surface, and its pressure relief bursting surface is flush with the outer wall surface of the battery. The pressure relief notch is in a groove shape, and the function of the pressure relief notch is to reduce the strength of this area of the battery. When the air pressure inside the battery is too large, the gas breaks through this area and leaks out from the battery. For the battery with this kind of structure, since the strength of the area where the pressure relief notch is provided is relatively weak compared with other places, and the area where the pressure relief notch is located is flush with the outer wall surface of the battery, this area is easily damaged by bumping, which will cause the battery to stop working. That is, for the battery with this kind of structure, it has the defect of relatively low structural reliability. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a battery with relatively high structural reliability.

[0004] To achieve the above purpose, the utility model provides a battery including a housing, wherein a groove is provided on the outer wall surface of the housing, and a pressure relief groove is provided on the groove bottom surface of the groove, so that the groove bottom surface of the groove forms a pressure relief bursting surface, and the groove bottom surface of the pressure relief groove is an arc surface recessed towards the inside of the housing.

[0005] In a specific embodiment of the utility model, the junction of the groove opening and the outer wall surface of the housing is circular.

[0006] In a specific embodiment of the utility model, the groove side surface is a conical wall surface extending obliquely around the circumference from the groove bottom to the groove opening.

[0007] In a specific embodiment of the utility model, the pressure relief groove is circular;

[0008] Or, the pressure relief groove is in a shape of a segment;

[0009] Or, the pressure relief groove is arc-shaped, and the number of the pressure relief grooves is at least two. All the pressure relief grooves are arranged circumferentially and the arc openings face inwards, and adjacent two pressure relief grooves are arranged at intervals.

[0010] In a specific embodiment of the utility model, the pressure relief groove is arranged around the center of the groove.

[0011] In a specific embodiment of the utility model, the battery further comprises a boss, the shell protrudes outward to form the boss, and the boss is located at the bottom surface of the groove and at the inner side of the pressure relief groove.

[0012] In a specific embodiment of the utility model, the boundary between the boss and the bottom surface of the groove, and the boundary between the inner edge of the pressure relief groove and the bottom surface of the groove are collinear.

[0013] In a specific embodiment of the present invention, in the depth direction of the groove, the length dimension of the boss is not greater than the depth dimension of the groove.

[0014] In a specific embodiment of the present invention, the shell is cylindrical, and the groove is arranged at one end of the shell along the length direction thereof.

[0015] The utility model further provides a battery pack, comprising a box and the battery as described above, wherein the battery is arranged in the box.

[0016] The utility model also provides an electrical device, comprising the battery or the battery pack as described above.

[0017] The battery, battery pack and electrical equipment of the present utility model have the following beneficial effects compared with the prior art:

[0018] In the battery of the embodiment of the utility model, the groove and the pressure relief groove constitute an explosion-proof structure, and the pressure relief groove is arranged on the groove bottom surface of the groove, so that the groove bottom surface of the groove forms a pressure relief explosion surface, that is, the pressure relief explosion surface of the battery is recessed inward relative to the outer wall surface of the shell, thereby, when the battery is bumped, it will first hit the outer wall surface of the battery shell and is not easy to hit the pressure relief explosion surface, and the structural reliability of the battery is relatively high; and when the battery is applied to the battery pack, when the battery is depressurized, the groove cavity of the groove provides an escape space, and the pressure relief explosion surface does not contact the relevant structure of the battery pack, thereby, the pressure relief explosion surface is more easily broken open, which is conducive to the exhaust of the battery;

[0019] In addition, the bottom surface of the pressure relief groove is an arc-shaped surface protruding toward the inside of the shell, and it is not a sharp structure. The pressure relief groove of this structure can effectively disperse and resist pressure, thereby further reducing the fluctuation range of the opening of the explosion-proof structure, improving the opening accuracy of the explosion-proof structure, and making the structure of the explosion-proof structure stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a battery in an embodiment of the utility model;

[0021] Figure 2 This is a structural diagram of the matching of the groove and the pressure relief groove in the embodiment of the utility model;

[0022] Figure 3 This utility model embodiment Figure 2 A cross-sectional schematic diagram of the cooperation between the middle groove and the pressure relief groove;

[0023] Figure 4 It is another cross-sectional schematic diagram of the matching of the groove and the pressure relief groove in the embodiment of the utility model.

[0024] In the figure, 1, outer shell; 2, groove; 3, pressure relief groove; 4, boss. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the present application, the pressure relief groove described below is an indentation formed by a stamping process during the manufacturing process. Its function is to help relieve internal pressure and release gas when an abnormal situation occurs in the battery (such as overcharging, short circuit, continuous heating to thermal runaway, etc.) to prevent the battery from exploding or catching fire.

[0027] like Figure 1 As shown, a battery of an embodiment of the utility model includes a shell 1, the outer wall surface of the shell 1 is provided with a groove 2, and the bottom surface of the groove 2 is provided with a pressure relief groove 3, so that the bottom surface of the groove 2 forms a pressure relief explosion surface, and the bottom surface of the pressure relief groove 3 is an arc-shaped surface recessed toward the shell 1.

[0028] Specifically, the groove 2 and the pressure relief groove 3 constitute an explosion-proof structure, and the pressure relief groove 3 is arranged on the bottom surface of the groove 2, so that the bottom surface of the groove 2 forms a pressure relief explosion surface, that is, the pressure relief explosion surface of the battery is recessed inward relative to the outer wall surface of the outer shell 1, thereby, when the battery is bumped, it will first hit the outer wall surface of the battery shell 1 and is not easy to hit the pressure relief explosion surface, and the structural reliability of the battery is relatively high; when the battery is applied to the battery pack, when the battery is depressurized, the groove cavity of the groove 2 provides an escape space, and the pressure relief explosion surface does not contact the relevant structure of the battery pack, thereby, the pressure relief explosion surface is more easily broken open, which is beneficial to the battery exhaust.

[0029] In addition, the bottom surface of the pressure relief groove 3 is an arc-shaped surface protruding toward the inside of the shell 1, and it is not a sharp structure. The pressure relief groove 3 of this structure can effectively disperse and resist pressure, thereby further reducing the fluctuation range of the opening of the explosion-proof structure, improving the opening accuracy of the explosion-proof structure, and also making the explosion-proof structure of the shell 1 stable and reliable.

[0030] Moreover, since the bottom surface of the pressure relief groove 3 is an arc surface, the surface of the mold used to stamp the pressure relief groove 3 to form the arc surface is also an arc, and it has a non-sharp structure. Therefore, the mold is not easily damaged and has the advantage of a long service life.

[0031] In practical applications, the setting of the pressure relief groove 3 weakens the strength of the housing 1 at this place. Therefore, when the gas generated in the battery increases to a certain extent, the gas in it breaks through the pressure relief groove 3, and the gas escapes from the rupture of the battery to avoid the battery exploding and catching fire.

[0032] In this embodiment, as Figure 2 and Figure 3 shown, the area where the housing 1 is provided with the groove 2 forms a pressure relief area. The pressure relief area has only one boundary, and the boundary is the intersection of the notch of the groove 2 and the outer wall surface of the housing 1, and this boundary is annular; optionally, the groove 2 is a circular groove body. At this time, this boundary is circular. This kind of explosion-proof structure is simple in structure and convenient to process. It should be noted that the diameter of the groove 2 is set according to actual applications, and the groove 2 can also be an elliptical groove body. At this time, this boundary is elliptical, and the present application does not limit this.

[0033] Furthermore, the groove side wall of the groove 2 is a conical wall surface that extends obliquely around the circumference from the groove bottom to the groove opening. Therefore, when the groove 2 is processed and formed, the setting of the conical wall surface makes the feeding process easier during the forming process of the housing 1, making the size of the housing 1 more uniform.

[0034] Among them, the pressure relief groove 3 is annular and extends along a closed trajectory connected end to end. Optionally, the pressure relief groove 3 is circular, and its diameter is set according to actual applications. Therefore, when the battery is depressurized and breaks through the pressure relief groove 3, a relatively large range of air release ports will be formed, which is beneficial to improving the air release efficiency; in addition, the pressure relief groove 3 is arranged around the center of the groove 2 and is easy to process. Among them, the two can be concentrically arranged or eccentrically arranged, and the present application does not limit this. In addition, the shape of the pressure relief groove 3 being generally annular is also within the protection scope of the present application. For example, the pressure relief groove 3 is generally annular as a whole, and only part of it bulges inward or outward. At this time, the pressure relief groove 3 is an irregular ring.

[0035] It should be noted that the shape of the pressure relief groove 3 can also be elliptical annular, crescent-shaped, etc. The present application does not limit its shape and size. For this kind of pressure relief groove 3 with such a structure, when it is depressurized, a relatively large range of pressure relief ports are formed inside it, which is beneficial to rapid exhaust; and in a plane perpendicular to the extension trajectory of the pressure relief groove 3, the cross-sectional contour of the pressure relief groove 3 can be V-shaped (V-shaped with an arc-shaped bottom surface), U-shaped, semi-circular or other shapes that can play a pressure relief role, and the present application does not limit this.

[0036] In some other embodiments, the pressure relief groove 3 is arc-shaped, and the number of the pressure relief grooves 3 is at least two. All the pressure relief grooves 3 are arranged circumferentially with the arc-shaped openings facing inwards, and adjacent two pressure relief grooves 3 are arranged at intervals. At this time, it can also achieve the pressure relief function, and when it relieves pressure, a relatively large range of pressure relief openings will be formed on its inner side, which is beneficial to rapid exhaust.

[0037] Further, as Figure 4 shown, the battery further includes a boss 4. The outer shell 1 bulges outwards to form the boss 4. The boss 4 is located on the bottom surface of the groove 2. The junction between the boss 4 and the bottom surface of the groove 2 and the junction between the inner edge of the pressure relief groove 3 and the bottom surface of the groove 2 are collinear, that is, the boss 4 is located inside the pressure relief groove 3. Specifically, when the pressure relief groove 3 is processed by stamping, the outer shell 1 feeds to form the boss 4, that is, the die for processing the pressure relief groove 3 has an avoidance groove, and the avoidance groove is located inside the forming protrusion for processing the pressure relief groove 3. Based on this, when the die processes the pressure relief groove 3, the outer shell 1 feeds towards the avoidance groove and forms the above-mentioned boss 4. Through this method, an explosion-proof structure is formed. The structure of the outer shell 1 is reliable, the processing accuracy of the pressure relief groove 3 is high, the fluctuation range of the opening of the explosion-proof structure is small, and the explosion-proof structure has a high opening accuracy.

[0038] Furthermore, in the depth direction of the groove 2, the length dimension of the boss 4 is not greater than the depth dimension of the groove 2, that is, the boss 4 is completely accommodated in the groove 2 without protruding outside the groove 2. Thus, the boss 4 will not affect the assembly of the battery into the battery pack or the electrical equipment.

[0039] It should be noted that since the boss 4 is formed by the feeding of the outer shell 1 during the stamping process, the surface of the boss 4 facing away from the bottom surface of the groove 2 and the part of the inner wall surface of the outer shell 1 relative to the boss 4 are not absolutely flat. The application does not limit the shape of the boss 4.

[0040] The outer edge of the pressure relief groove 3 and the bottom surface of the groove 2 can be transitioned by an arc surface or by a stepped surface. The application does not limit this.

[0041] In some other embodiments, the junction between the boss 4 and the bottom surface of the groove 2 and the junction between the inner edge of the pressure relief groove 3 and the bottom surface of the groove 2 are not collinear. The junction between the boss 4 and the bottom surface of the groove 2 is connected to the inner edge of the pressure relief groove 3 through a raised structure. Thus, when the die processes the pressure relief groove 3, the outer shell 1 can also feed towards the avoidance groove and form the above-mentioned boss 4. Through this method, an explosion-proof structure is formed. The outer shell 1 also has the advantage of reliable structure, the pressure relief groove 3 also has the advantage of high processing accuracy, the fluctuation range of the opening of the explosion-proof structure is small, and the explosion-proof structure has a high opening accuracy.

[0042] In this embodiment, the outer shell 1 is cylindrical, and the groove 2 is provided at one end of the outer shell 1 along its length direction. Thus, when the battery relieves pressure, it exhausts gas along its length direction. In practical applications, for a battery assembled in a battery pack or an electrical device, when it relieves pressure, it will not directly spray gas onto the adjacent components, reducing the adverse effects on the adjacent components.

[0043] In some other embodiments, the outer shell 1 is square, that is, the battery is a square battery, and its explosion-proof structure also has the advantage of relatively high opening accuracy.

[0044] Based on the above battery, an embodiment of the present invention further provides a battery pack, which includes a box body and the above battery. The battery is disposed in the box body. Among them, the number of batteries is multiple, and the multiple batteries are connected in series or in parallel.

[0045] It can be understood that the battery pack of the embodiment of the present application includes the technical features and technical effects of the foregoing battery, which will not be elaborated herein.

[0046] Based on the above battery, the present invention further provides an electrical device, which includes the above battery, or, the above battery pack;

[0047] It can be understood that the electrical device of the embodiment of the present application includes the technical features and technical effects of the foregoing battery, which will not be elaborated herein.

[0048] Of course, the electrical devices referred to in the present application may include, but are not limited to, electric vehicles, electric bicycles, electric motorcycles, large-sized storage batteries, etc.

[0049] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery, characterized in that: The invention comprises a shell (1), wherein the outer wall surface of the shell (1) is provided with a groove (2), and the bottom surface of the groove (2) is provided with a pressure relief groove (3), so that the bottom surface of the groove (2) forms a pressure relief explosion surface, and the bottom surface of the pressure relief groove (3) is an arc-shaped surface recessed toward the inside of the shell (1).

2. The battery according to claim 1, characterized in that The boundary between the notch of the groove (2) and the outer wall surface of the shell (1) is annular.

3. The battery according to claim 1 or 2, characterized in that: The groove side surface of the groove (2) is a conical wall surface extending obliquely in all directions from the groove bottom to the groove mouth.

4. The battery according to claim 3, characterized in that The pressure relief groove (3) is annular; Or, the pressure relief groove (3) is in the shape of a ring; Alternatively, the pressure relief grooves (3) are arc-shaped, the number of the pressure relief grooves (3) is at least two, all the pressure relief grooves (3) are arranged circumferentially with the arc-shaped openings facing inwards, and two adjacent pressure relief grooves (3) are arranged at intervals.

5. The battery according to claim 4, characterized in that The pressure relief groove (3) is arranged around the center of the groove (2).

6. The battery according to claim 5, characterized in that The battery further comprises a boss (4), the outer shell (1) protrudes outward to form the boss (4), and the boss (4) is located at the bottom surface of the groove (2) and at the inner side of the pressure relief groove (3).

7. The battery according to claim 6, characterized in that The boundary between the boss (4) and the bottom surface of the groove (2), and the boundary between the inner edge of the pressure relief groove (3) and the bottom surface of the groove (2) are collinear.

8. The battery according to claim 6, characterized in that In the depth direction of the groove (2), the length dimension of the boss (4) is not greater than the depth dimension of the groove (2).

9. The battery according to claim 1, characterized in that The shell (1) is cylindrical, and the groove (2) is arranged at one end of the shell (1) along its length direction.

10. A battery pack, characterized in that: It comprises a box and a battery as described in any one of claims 1 to 9, wherein the battery is arranged in the box.

11. An electrical device, characterized in that: Comprising the battery as described in any one of claims 1 to 9 or the battery pack as described in claim 10.

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