Battery monomer, battery pack and electric equipment

Abstract

The utility model relates to a battery monomer, battery pack and electric equipment, the battery monomer comprises a shell and a roll core, the shell comprises an annular side wall and a circular connecting part, the connecting part is provided with a first surface and a second surface which are opposite to each other, and the first surface of the connecting part is connected with one end of the annular side wall at an included angle; the second surface of the connecting part is provided with a groove communicated with the annular side wall, the groove bottom surface of the groove is provided with anti-explosion scribed lines so that a blasting area communicated with the annular side wall can be formed on the groove bottom surface of the groove, and the roll core is contained in the containing cavity. That is to say, when the battery monomer is subjected to pressure relief, the blasting area is communicated with the side wall, and the gap exists between the side wall and the roll core, so that the gas can be quickly discharged, the stress of the annular side wall is further reduced, and the side wall or the associated position thereof is prevented from cracking due to unsmooth pressure relief.

Description

Technical Field

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

[0002] When the battery is in short circuit, overcharge, continuous heating until out of control, etc., 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 so that when the air pressure inside the battery is too high, the gas inside can be discharged to the outside of the battery through the explosion-proof structure, thereby avoiding the explosion and fire of the battery.

[0003] In the related art, the main measure to prevent explosion when the battery fails is to set an explosion-proof scribe line at the bottom of the battery case. When the gas is generated due to battery failure, the explosion-proof scribe line breaks and discharges the gas inside the battery, reducing the pressure inside the battery case, thereby avoiding the explosion of the battery. However, the current explosion-proof scribe line is generally set at the center or an eccentric position at the bottom of the battery case, directly facing the winding core inside the battery case. This not only makes the flow of gas interfered by the winding core, resulting in poor air flow and affecting the pressure relief effect. At the same time, the explosion-proof structure is far from the side wall. After the air pressure inside the battery case rises, the gas accumulated at the inner wall of the side wall is difficult to discharge, which may cause the side wall or its associated position to crack. Summary of the Utility Model

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a battery cell, a battery pack and an electrical equipment.

[0005] In a first aspect, the present application provides a battery cell, including:

[0006] A housing, which includes an annular side wall and a circular connecting part. The connecting part has opposite first and second surfaces. The first surface of the connecting part is connected to one end of the annular side wall at an angle, so as to form a receiving cavity with an opening inside the housing. The second surface of the connecting part is provided with a groove communicating with the annular side wall. The bottom surface of the groove is provided with an explosion-proof scribe line to form a blasting area communicating with the annular side wall on the bottom surface of the groove.

[0007] In a possible implementation manner, the surface of the blasting area is lower than the second surface of the connecting part.

[0008] In a possible implementation manner, the explosion-proof scribe line is arranged around the center of the groove.

[0009] In a possible implementation manner, the side surface of the groove is a conical wall surface that extends obliquely around from the bottom to the opening.

[0010] In a possible implementation, the number of the explosion-proof engraved lines is at least one, and all the explosion-proof engraved lines are circumferentially arranged in the groove, and two adjacent explosion-proof engraved lines are arranged at intervals.

[0011] In a possible implementation, the explosion-proof engraved lines are arc-shaped.

[0012] In a possible implementation, the number of the grooves is one or more, and all the grooves are arranged at intervals around the center of the connecting part.

[0013] In a possible implementation, the connecting part and the annular side wall are an integral part or a split part.

[0014] In a second aspect, the present application further provides a battery pack, including a plurality of battery cells as described above.

[0015] In a third aspect, the present application further provides an electrical device, including the battery pack as described above.

[0016] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0017] By providing a groove communicating with the annular side wall on the second surface of the connecting part, and arranging explosion-proof engraved lines on the groove bottom surface of the groove, a blasting area communicating with the annular side wall is formed in the groove. Since there is a gap between the winding core and the side wall, it is beneficial to the rapid discharge of gas, thereby reducing the stress on the annular side wall, and thus avoiding cracking of the side wall or its associated position due to unsmooth pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] In the drawings:

[0021] Figure 1 is a schematic structural diagram of a battery cell of the present application;

[0022] Figure 2 is a schematic structural diagram of the cooperation between the groove and the explosion-proof engraved lines in a battery cell of the present application;

[0023] Figure 3Schematic structural diagram of a connection part in a battery cell of the present application;

[0024] Figure 4 It is a schematic cross-sectional view showing the cooperation of a groove and an explosion-proof scoring line in a battery cell of the present application.

[0025] Reference numerals in the drawings:

[0026] 10. Housing; 11. Annular side wall; 12. Connection part; 12a. First surface; 12b. Second surface; 20. Groove; 30. Explosion-proof scoring line; A. Blasting area. Detailed implementation manners

[0027] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, with a specific orientation structure and operation, and are only for the convenience of describing the present technical solution, rather than indicating that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0028] It should also be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as being "above" or "below" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0030] Please refer to Figure 1 and Figure 2 , the present application provides a single cell, which includes a housing 10 and a wound core. The housing 10 includes an annular side wall 11 and a circular connecting portion 12. The connecting portion 12 has opposite first surface 12a and second surface 12b. The first surface 12a of the connecting portion 12 is connected to one end of the annular side wall 11 at an angle, so as to form a receiving cavity with an opening inside the housing 10. A groove 20 communicating with the annular side wall 11 is provided on the second surface 12b of the connecting portion 12. An explosion-proof scoring line 30 is provided on the bottom surface of the groove 20 to form a blasting area A communicating with the annular side wall 11 on the bottom surface of the groove 20. The wound core is received in the receiving cavity.

[0031] Based on the above technical features of the battery cell, by providing a groove 20 communicating with the annular side wall 11 on the second surface 12b of the connecting portion 12 and providing an explosion-proof scoring line 30 on the bottom surface of the groove 20 to form a blasting area A communicating with the annular side wall 11 on the bottom surface of the groove 20, and since there is a gap between the wound core received in the receiving cavity and the side wall, it is beneficial to the rapid discharge of gas, ensuring that the air pressure acting on the annular side wall 11 passes smoothly, thereby reducing the force on the annular side wall 11 and avoiding cracking of the side wall or its associated positions due to unsmooth pressure relief.

[0032] Exemplarily, referring to Figure 1 and Figure 3 , in this embodiment, the two opposite surfaces of the connecting portion 12 are respectively defined as the first surface 12a and the second surface 12b for the convenience of describing the connection relationship between the connecting portion 12 and the annular side wall 11. Among them, the first surface 12a refers to the surface connected to the annular side wall 11, and the second surface 12b refers to the surface facing away from the annular side wall 11. That is to say, after the connecting portion 12 and the annular side wall 11 are connected to form the housing, the first surface 12a of the connecting portion 12 is specifically the inner cavity bottom surface of the housing 10, and the second surface 12b of the connecting portion 12 is specifically the outer peripheral bottom surface of the housing 10.

[0033] Exemplarily, by providing a groove 20 on the second surface 12b of the connecting portion 12 and providing an explosion-proof scoring line 30 on the bottom surface of the groove 20, an explosion area A is formed on the bottom surface of the groove 20, thereby forming an explosion-proof structure composed of the groove 20 and the explosion-proof scoring line 30. That is to say, based on the surface of the explosion area A being lower than the second surface 12b of the connecting portion 12, it is to make the explosion area A of the battery recessed inward relative to the second surface 12b of the connecting portion 12. Thus, when the battery is bumped, it will first touch the second surface 12b of the connecting portion 12 and is not easily bumped against the explosion area A, ensuring that the battery has a highly reliable structure. In addition, the bottom surface of the explosion-proof scoring line 30 is an arc-shaped surface protruding toward the inside of the connecting portion 12, and it is not a sharp structure. The explosion-proof scoring line 30 of this structure can effectively improve the dispersion and resistance to pressure, and further reduce the fluctuation range of the opening of the explosion-proof structure, thereby improving the opening accuracy of the explosion-proof structure.

[0034] It should be noted that the above explosion-proof scoring line 30 is an indentation formed by stamping during the manufacturing process. Its function is to release gas to help relieve the internal pressure of the housing 10 when the battery undergoes abnormal conditions (such as overcharging, short circuit, continuous heating to thermal runaway, etc.), so as to prevent the battery from exploding or catching fire. In actual applications, the setting of the explosion-proof scoring line 30 weakens the strength of the connecting portion 12 at this place, so that when the gas generated inside the housing 10 increases to a certain extent, the gas inside will break through the explosion-proof scoring line 30, and then open the explosion area A, allowing the gas to quickly escape from the housing 10, thereby avoiding the explosion and fire of the single battery.

[0035] As Figure 2 shown, in a possible implementation manner, the center of the explosion area A coincides with the center of the groove 20. In this way, it can be ensured that the explosion area A can overlap as much as possible with the bottom surface of the groove 20, so that when the single battery relieves pressure, the explosion area A broken through by the gas is larger, which is beneficial to the rapid discharge of the gas inside the housing 10.

[0036] In a possible implementation manner, the explosion-proof scoring line 30 is provided around the center of the groove 20. In this way, it is easier to process the explosion-proof scoring line 30. Among them, the explosion-proof scoring line 30 being provided around the center of the groove 20 means that it can be concentrically arranged or eccentrically arranged, and the present application does not limit this.

[0037] In a possible implementation manner, the side surface of the groove 20 is a tapered wall surface that extends obliquely around from the bottom to the opening. In this way, when the groove 20 is processed and formed, the tapered shape of the groove 20 can make the housing 10 more easily feed during the forming process, making the size of the housing 10 more uniform.

[0038] In a possible implementation, the number of explosion-proof score lines 30 is one, which is arranged around the center of the groove 20 to form a larger explosion area A on the bottom surface of the groove 20, facilitating the rapid discharge of the gas inside the housing 10.

[0039] In another implementation, the number of explosion-proof score lines 30 is two or more. All the explosion-proof score lines 30 are circumferentially arranged in the groove 20, and adjacent explosion-proof score lines 30 are spaced apart. In this way, while achieving the pressure relief function, the bottom surface of the groove 20 can be divided into several explosion areas A, making the explosion pressures required for each explosion area A tend to be consistent and enabling a better pressure relief effect.

[0040] As Figure 4 shown, in a possible implementation, the explosion-proof score line 30 is arc-shaped. Optionally, the explosion-proof score line 30 is a major arc. When the explosion-proof score line 30 of this structure is used for pressure relief, a relatively large pressure relief opening can be formed inside, facilitating the rapid discharge of the gas inside the housing 10. It should be noted that the shape of the explosion-proof score line 30 can also be other shapes (such as semi-circular, annular, etc.), and the present application does not limit its shape and size.

[0041] In a possible implementation, the number of grooves 20 is one or more, and all the grooves 20 are arranged at intervals around the center of the connecting portion 12. In this way, multiple explosion-proof structures can be formed on the connecting portion 12 of the housing 10, facilitating the rapid discharge of the gas generated inside the housing 10 and achieving a better pressure relief effect.

[0042] In a possible implementation, the connecting portion 12 and the annular side wall 11 are an integral part or separate parts. That is to say, the connecting portion 12 and the annular side wall 11 can be made by an integral molding process, or the connecting portion 12 and the annular side wall 11 form two separate structures. After the connecting portion 12 and the annular side wall 11 are molded, they are then connected to form the housing 10.

[0043] Specifically, the housing 10 is formed by a stamping process so that the housing 10 can be formed into a structure including an annular side wall 11 and a circular connecting portion 12. The connecting portion 12 and the annular side wall 11 are an integral part, and one end of the connecting portion 12 is connected to the annular side wall 11 at an angle, which can eliminate the connection between the annular side wall 11 and the circular connecting portion 12 and ensure the structural strength of the housing 10.

[0044] Based on the above single cell, an embodiment of the present utility model further provides a battery pack, which includes a plurality of the above single cells. Among them, the plurality of single cells can be connected in series or in parallel, and this is not limited.

[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 single battery, which will not be elaborated here.

[0046] Based on the above battery pack, the present utility model further provides an electrical device, which includes the battery pack as described above.

[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 here.

[0048] Of course, the electrical device referred to in the present application may include, but is not limited to, energy storage, electric vehicles, electric bicycles, electric motorcycles, large batteries, etc.

[0049] It can be understood that the above embodiments only represent the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A battery cell, characterized in that, Comprising: A housing, which includes an annular side wall and a circular connecting portion. The connecting portion has opposite first and second surfaces. The first surface of the connecting portion is connected to one end of the annular side wall at an angle, so as to form a receiving cavity with an opening inside the housing. The second surface of the connecting portion is provided with a groove communicating with the annular side wall. The bottom surface of the groove is provided with an explosion-proof scoring line to form a blasting area communicating with the annular side wall on the bottom surface of the groove.

2. The battery cell according to claim 1, characterized in that, The surface of the blasting area is lower than the second surface of the connecting portion.

3. The battery cell according to claim 1, wherein The explosion-proof scoring line is arranged around the center of the groove.

4. The battery cell according to claim 1, wherein, The side wall surface of the groove is a conical wall surface that extends obliquely around from the bottom to the opening of the groove.

5. The battery cell according to claim 4, characterized in that, The number of the explosion-proof scoring lines is at least one. All the explosion-proof scoring lines are arranged circumferentially in the groove, and adjacent two explosion-proof scoring lines are arranged at intervals.

6. The battery cell according to claim 5, characterized in that, The explosion-proof scoring line is arc-shaped.

7. The battery cell according to claim 1, characterized in that, The number of the grooves is one or more. All the grooves are arranged at intervals around the center of the connecting portion.

8. The battery cell according to claim 1, wherein The connecting portion and the annular side wall are an integral part or a separate part.

9. A battery pack, characterized in that, Comprising a plurality of battery monomers as described in any one of claims 1 to 8.

10. An electrical device, characterized in that, Comprising a battery pack as described in claim 9.

Images