Shell assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a shell assembly, a battery, a battery pack and electric equipment. The shell assembly comprises a first shell, a second shell and an insulating part, the first shell is provided with a first cavity, the second shell is provided with a second cavity, and the insulating part is provided with a third cavity. The insulating part is provided with a first connecting part and a second connecting part. The first shell and the second shell are provided with a first matching part and a second matching part respectively. The first connecting part is provided with a first annular groove, and the second connecting part is provided with a second annular groove. The first matching part is fixed to the first annular groove, and the groove wall face of the first annular groove abuts against the outer circumferential face and the inner circumferential face of the first matching part. The second matching part is fixed to the second annular groove, and the groove wall face of the second annular groove abuts against the outer circumferential face and the inner circumferential face of the second matching part. The first cavity, the third cavity and the second cavity are communicated to form a containing cavity. The battery has the advantages of fewer structural parts, simple structure, low cost and better sealing performance.

Description

Technical Field

[0001] The present application relates to the automotive field, and in particular to a housing assembly, a battery, a battery pack, and an electrical device. Background Art

[0002] In the field of power batteries, the battery needs to be equipped with positive and negative electrodes to connect with the positive and negative electrodes of the electrical equipment so that the battery can power the electrical equipment. Currently, the batteries on the market mainly use two poles as the positive and negative electrodes of the battery. The poles need to be riveted and assembled with the cover plate, seal and insulation parts. The structure is complex, the sealing is difficult, and the sealing effect is poor. Utility Model Content

[0003] The purpose of the present application is to provide a shell assembly, a battery, a battery pack and an electrical device with fewer structural parts, a simple structure, low cost and better battery sealing.

[0004] In a first aspect, the present application provides a housing assembly, comprising: a first housing, a second housing and an insulating member. The first housing is provided with a first cavity, the second housing is provided with a second cavity, and the insulating member is provided with a third cavity.

[0005] The insulating member is provided with a first connecting portion and a second connecting portion at opposite ends thereof; the first shell and the second shell are provided with a first matching portion and a second matching portion respectively; or the first shell is provided with a first connecting portion and the second shell is provided with a second connecting portion, and the insulating member is provided with a first matching portion and a second matching portion at opposite ends thereof.

[0006] Along the length direction of the shell assembly, the insulating member is located between the first shell and the second shell, the first connecting portion is provided with a first annular groove, and the second connecting portion is provided with a second annular groove.

[0007] The first matching part is fixed to the first annular groove, and the groove wall of the first annular groove abuts against the outer circumference and inner circumference of the first matching part. The second matching part is fixed to the second annular groove, and the groove wall of the second annular groove abuts against the outer circumference and inner circumference of the second matching part.

[0008] The first cavity, the third cavity and the second cavity are connected in sequence to form a receiving cavity. The receiving cavity is used to receive the battery cell, the first shell is used to be electrically connected to the positive electrode ear of the battery cell, and the second shell is used to be electrically connected to the negative electrode ear of the battery cell.

[0009] When the shell assembly is used for a battery, the first shell and the second shell serve as the positive and negative electrodes of the battery, and the battery does not need to be provided with a pole, and the battery cover does not need to be provided with a pole hole. The battery cover does not need to be riveted with the pole, the seal and the insulating member to achieve the sealing of the pole hole and the insulation of the pole and the cover. The battery cover can be integrated with the battery shell, which simplifies the structure and assembly process of the battery, thereby reducing costs. In addition, the number of structural parts in the battery is reduced, and the capacity of the battery is increased.

[0010] In addition, along the axial direction of the shell assembly, the first connecting part and the second connecting part are provided with a first annular groove and a second annular groove, the first matching part is fixed to the first annular groove, and the two groove sides of the first annular groove abut against the inner circumference and outer circumference of the first matching part. The second matching part is fixed to the second annular groove, and the two groove sides of the second annular groove abut against the inner circumference and outer circumference of the second matching part. This makes the sealing between the first shell, the second shell and the insulating part better, the battery does not need to be sealed with glue, and the production process is optimized, thereby meeting the battery performance requirements while reducing costs.

[0011] In some embodiments, the first matching portion is provided with a first clamping member, and the first annular groove is provided with a second clamping member. The first clamping member and the second clamping member are fixedly connected. By providing the first clamping member and the second clamping member, the relative axial movement and radial movement of the first shell and the insulating member are limited, the first shell is prevented from loosening, the stability of the connection between the first shell and the insulating member is improved, and the sealing of the battery is thereby improved.

[0012] In some embodiments, the first clamping member includes a first groove and a first protrusion. The first groove is recessed on the outer circumferential surface of the first matching portion, and the first protrusion is protruding on the inner circumferential surface of the first matching portion. The second clamping member includes a second groove and a second protrusion, the second groove is recessed on the inner groove side of the first annular groove, and the second protrusion is protruding on the outer groove side of the first annular groove.

[0013] Alternatively, the first groove is recessed on the inner circumference of the first matching portion, and the first protrusion is recessed on the outer circumference of the first matching portion. The second groove is recessed on the outer groove side of the first annular groove, and the second protrusion is recessed on the inner groove side of the first annular groove. The first protrusion is clamped to the second groove, and the second protrusion is clamped to the first groove.

[0014] By arranging the first protrusion to be clamped in the second groove and the second protrusion to be clamped in the first groove, the relative axial and radial movements of the first shell and the insulating member are restricted, the first shell is prevented from loosening, the stability of the connection between the first shell and the insulating member is improved, and the sealing of the battery is further improved.

[0015] In some embodiments, the second matching portion is provided with a third clamping member, and the second annular groove is provided with a fourth clamping member. The third clamping member is fixedly connected to the fourth clamping member. By providing the third clamping member and the fourth clamping member, the relative axial movement and radial movement of the second shell and the insulating member are limited, the second shell is prevented from loosening, the stability of the connection between the second shell and the insulating member is improved, and the sealing of the battery is improved.

[0016] In some embodiments, the third clamping member includes a third groove and a third protrusion. The third groove is recessed on the outer circumferential surface of the second matching portion, and the third protrusion is protruding on the inner circumferential surface of the second matching portion. The fourth clamping member includes a fourth groove and a fourth protrusion, and the fourth groove is recessed on the inner groove side of the second annular groove. The fourth protrusion is protruding on the outer groove side of the second annular groove.

[0017] Alternatively, the third groove is recessed on the inner circumference of the second matching portion, and the third protrusion is recessed on the outer circumference of the second matching portion. The fourth groove is recessed on the outer groove side of the second annular groove. The fourth protrusion is recessed on the inner groove side of the second annular groove. The third protrusion is clamped to the fourth groove, and the fourth protrusion is clamped to the third groove.

[0018] By arranging the third protrusion to be clamped in the fourth groove and the fourth protrusion to be clamped in the third groove, the relative axial and radial movements of the second shell and the insulating member are restricted, the second shell is prevented from loosening, the stability of the connection between the second shell and the insulating member is improved, and the sealing of the battery is further improved.

[0019] In some embodiments, the insulating member is provided with an explosion-proof groove, which is concavely arranged on the outer circumference of the insulating member or the inner circumference of the insulating member, and is located between the bottom surface of the first annular groove and the bottom surface of the second annular groove. By providing the explosion-proof groove, when the battery fails and the gas pressure inside the battery increases, the explosion-proof groove can explode and release the pressure, thereby avoiding the explosion caused by excessive gas pressure inside the battery, thereby improving the safety performance of the battery.

[0020] In other embodiments, the insulating member is not provided with an explosion-proof groove. The shell assembly is provided with an explosion-proof valve, and the insulating member is provided with an explosion-proof hole. The explosion-proof hole penetrates the outer circumference and the inner circumference of the insulating member, and the explosion-proof hole is provided between the bottom surface of the first annular groove and the bottom surface of the second annular groove. The explosion-proof valve is fixed to the explosion-proof hole and closes the explosion-proof hole. By providing an explosion-proof valve, when a battery fails and the air pressure inside the battery increases, the explosion-proof valve can explode and release pressure, thereby avoiding explosion caused by excessive air pressure inside the battery, thereby improving the safety performance of the battery.

[0021] In some embodiments, the first housing includes a first sleeve and a first cover plate, and along the length direction of the housing assembly, opposite ends of the first sleeve are open. The first cover plate is fixed to the opening of the first sleeve away from the insulating member, the first cover plate and the first sleeve enclose a first cavity, and the first connecting portion or the first matching portion is arranged at one end of the first sleeve away from the first cover plate.

[0022] The second shell includes a second sleeve and a second cover plate. The second sleeve is open at two opposite ends. The second cover plate is fixed to the opening of the second sleeve away from the insulating member. The second cover plate and the second sleeve enclose a second cavity. The second connecting portion or the second matching portion is arranged at one end of the second sleeve away from the second cover plate.

[0023] The first shell is configured as a first sleeve and a first cover plate, and the second shell is configured as a second sleeve and a second cover plate. When the shell assembly is used for a battery, the battery cell is first installed in the accommodating cavity, and then the first cover plate is fixed to the opening of the first shell, and the second cover plate is fixed to the opening of the second shell. The assembly is convenient, the production efficiency is improved, and the production cost is reduced.

[0024] In some embodiments, the housing assembly further includes a first current collecting disc and a second current collecting disc. The first current collecting disc is disposed inside the first cavity, is stacked on the first cover plate, is electrically connected to the first cover plate, and is used to electrically connect to the positive terminal of the battery cell.

[0025] The second current collecting disk is disposed in the second cavity, is stacked on the second cover plate, is electrically connected to the second cover plate, and is used to be electrically connected to the positive electrode ear of the battery cell.

[0026] The positive electrode ear is electrically connected to the first cover plate through the first current collecting plate, and the negative electrode ear is electrically connected to the second cover plate through the second current collecting plate. The electrical connection is more stable, so that the battery can stably transmit electrical energy to the outside of the battery.

[0027] In some embodiments, the first current collecting disc is provided with a first elastic portion, and the second current collecting disc is provided with a second elastic portion. Along the axial direction of the housing assembly, the first elastic portion is convexly disposed toward the second current collecting disc; and the second elastic portion is convexly disposed toward the first current collecting disc.

[0028] When the shell assembly is used for a battery, the battery cell is installed between the first elastic part and the second elastic part, and the first elastic part and the second elastic part respectively support the two ends of the battery cell. When the battery is vibrated by external impact, the first elastic part and the second elastic part respectively abut against the opposite ends of the battery cell, and the first elastic part and the second elastic part play a buffering role on the battery cell, preventing the battery cell from hitting the first shell and the second shell and being damaged, thereby improving the service life of the battery.

[0029] The second aspect of the present application provides a battery, including a battery cell and the shell assembly provided in the first aspect of the present application, the battery cell including a positive electrode ear and a negative electrode ear, the battery cell is arranged in a receiving cavity, the first shell is electrically connected to the positive electrode ear, and the second shell is electrically connected to the negative electrode ear.

[0030] In some embodiments, the second shell is provided with a liquid injection hole, and along the axial direction of the second shell, the liquid injection hole penetrates the cavity bottom surface of the second cavity and the side away from the cavity bottom surface of the second shell. The battery cell is provided with a liquid injection cavity and a liquid injection port connected to the liquid injection cavity, and the liquid injection hole is connected to the liquid injection port. The electrolyte can be added to the liquid injection cavity of the battery cell through the liquid injection port.

[0031] The third aspect of the present application provides a battery pack, comprising a box and the battery provided by the second aspect of the present application. The box is provided with a storage cavity, and a plurality of batteries are fixed in the storage cavity.

[0032] The fourth aspect of the present application provides an electrical device, including the battery pack provided by the third aspect of the present application, and the battery pack supplies power to the electrical device.

[0033] The shell assembly provided in the embodiment of the present application is used for a battery, and the first shell and the second shell are set as the positive and negative electrodes of the battery. The battery does not need to be provided with a pole, the battery cover does not need to be provided with a pole hole, and the battery cover does not need to be riveted with the pole, the seal and the insulating member to achieve the sealing of the pole hole and the insulation of the pole and the cover. The cover of the battery can be directly integrated with the shell of the battery, which simplifies the structure and assembly process of the battery, thereby reducing costs. The first connecting portion and the second connecting portion are respectively provided with a first annular groove and a second annular groove, and the first matching portion is fixed to the first annular groove, and the groove wall surface of the first annular groove abuts the inner circumference and outer circumference of the first matching portion. The second matching portion is fixed to the second annular groove, and the groove wall surface of the second annular groove abuts the inner circumference and outer circumference of the second matching portion. The sealing between the first shell, the second shell and the insulating member is better, and the battery does not need to be sealed with glue, which optimizes the production process, thereby meeting the battery performance requirements while reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation scheme are briefly introduced below.

[0035] Figure 1 It is a schematic diagram of the structure of the battery provided in the embodiment of the present application.

[0036] Figure 2 yes Figure 1 Exploded view of the battery shown in .

[0037] Figure 3 yes Figure 1 A plan cross-sectional view of the battery shown in FIG.

[0038] Figure 4 yes Figure 3 A partial enlarged view of the battery shown in .

[0039] Figure 5 yes Figure 3 A partial enlarged view of the battery shown in .

[0040] Figure 6 yes Figure 3 A partial enlarged view of the battery shown in .

[0041] Figure 7 It is a planar cross-sectional view of another embodiment of the explosion-proof valve of the battery provided in an embodiment of the present application.

[0042] Description of the accompanying drawings: 1000-battery, 100-battery cell, 101-positive ear, 102-negative ear, 200-first shell, 201-first cavity, 202, 302-cavity bottom, 203-first sleeve, 204-first cover, 205-first clamping member, 206-first groove, 207-first protrusion, 210-first matching part, 300-second shell, 301-second cavity, 303-second sleeve, 304-second cover, 305-third clamping member, 306-third groove, 307-third protrusion, 310-liquid injection hole, 311-second matching part, 400-insulating member, 401-third cavity, 402-first annular groove, 403-second annular groove, 404-first An insulating end face, 405-a second insulating end face, 412-a second clamping piece, 413-a second groove, 414-a second protrusion, 415-a fourth clamping piece, 416-a fourth groove, 417-a fourth protrusion, 418-an explosion-proof groove, 424-an explosion-proof hole, 425-a first connecting part, 426-a second connecting part, 500-an accommodating chamber, 600-an explosion-proof valve, 700-a first excitation disk, 701-a first elastic part, 800-a second current collecting disk, 801-a second elastic part, 900-a shell assembly, 209, 309, 420-an inner peripheral surface, 208, 308, 419-an outer peripheral surface, 406, 409-an inner groove side surface, 407, 410-an outer groove side surface, 421, 422, 423-a groove bottom surface. DETAILED DESCRIPTION

[0043] The technical solution in the embodiment of the present application will be described clearly and completely below in conjunction with the drawings in the embodiment of the present application. For ease of understanding, the length direction of the battery 1000 is defined as the Y axis, the radial direction of the battery 1000 is defined as the X axis, and the X axis and the Y axis are perpendicular.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 The battery 1000 provided in the embodiment of the present application includes: a battery cell 100 and a shell assembly 900, wherein the shell assembly 900 includes a first shell 200, a second shell 300 and an insulating member 400. The battery cell 100 includes a positive electrode ear 101 and a negative electrode ear 102. The first shell 200 is provided with a first cavity 201, the second shell 300 is provided with a second cavity 301, and the insulating member 400 is provided with a third cavity 401.

[0045] In this embodiment, the first connecting portion 425 and the second connecting portion 426 are respectively provided at opposite ends of the insulating member 400; the first housing 200 and the second housing 300 are respectively provided with a first matching portion 210 and a second matching portion 311. The first connecting portion 425 is the end of the insulating member 400 facing the first housing 200, and the second connecting portion 426 is the end of the insulating member 400 facing the second housing 300. The first matching portion 210 is the end of the first housing 200 facing the insulating member 400, and the second matching portion 311 is the end of the second housing 300 facing the insulating member 400.

[0046] In other embodiments, the positions of the first connection portion 425 and the first matching portion 210 on the insulating member 400 and the first housing 200 can be exchanged, and the positions of the second connection portion 426 and the second matching portion 311 on the insulating member 400 and the second housing 300 can be exchanged. That is, the first connection portion 425 and the second connection portion 426 can also be respectively arranged on the first housing 200 and the second housing 300, and the first matching portion 210 and the second matching portion 311 can also be arranged at opposite ends of the insulating member 400 along the Y-axis direction.

[0047] The drawings of this embodiment illustrate that the first connecting portion 425 and the second connecting portion 426 are respectively provided at opposite ends of the insulating member 400; the first housing 200 and the second housing 300 are respectively provided with a first matching portion 210 and a second matching portion 311. Another embodiment may refer to this embodiment.

[0048] Along the length direction of the battery 1000 , the insulating member 400 is located between the first shell 200 and the second shell 300 . The first connecting portion 425 is provided with a first annular groove 402 , and the second connecting portion 426 is provided with a second annular groove 403 .

[0049] The first matching portion 210 is fixed to the first annular groove 402, and the groove wall of the first annular groove 402 abuts against the outer and inner circumferences of the first matching portion 210. The second matching portion 311 is fixed to the second annular groove 403, and the groove wall of the second annular groove 403 abuts against the outer and inner circumferences of the second matching portion 311.

[0050] The first cavity 201, the third cavity 401 and the second cavity 301 are connected in sequence to form a receiving cavity 500. The battery cell 100 is disposed in the receiving cavity 500. The positive electrode tab 101 is electrically connected to the first shell 200, and the negative electrode tab 102 is electrically connected to the second shell 300.

[0051] For details, please refer to Figure 2 and Figure 3In this embodiment, the first shell 200 and the second shell 300 are cylindrical, the first shell 200 is provided with a first cavity 201 with an opening on one side, the first matching portion 210 is arranged at the end of the first shell 200 with an opening, the opening of the first cavity 201 faces the insulating member 400, and the first matching portion 210 faces the insulating member 400.

[0052] The second shell 300 is provided with a second cavity 301 with an opening on one side. The second matching portion 311 is disposed at the end of the second shell with the opening. The opening of the second cavity 301 faces the insulating member 400 , and the second matching portion 311 faces the insulating member 400 .

[0053] Please refer to Figure 2 , Figure 3 and Figure 4 The insulating member 400 is in a circular shape, and the first connecting portion 425 and the second connecting portion 426 are respectively two ends of the insulating member 400 along the Y-axis direction. The first connecting portion 425 faces the first shell 200, and the second connecting portion 426 faces the second shell 300.

[0054] The end surface of the first connection portion 425 facing the first housing 200 is the first insulating end surface 404, and the end surface of the second connection portion 426 facing the second housing 300 is the second insulating end surface 405. The first insulating end surface 404 is recessed with a first annular groove 402, and the second insulating end surface 405 is recessed with a second annular groove 403.

[0055] The first matching portion 210 is fixed to the first annular groove 402 , the inner groove side surface 406 and the outer groove side surface 407 of the first annular groove 402 respectively abut against the inner peripheral surface 209 and the outer peripheral surface 208 of the first matching portion 210 , and the groove bottom surface 421 of the first annular groove 402 abuts against the end surface of the first matching portion 210 .

[0056] Continue to refer Figure 2 , Figure 3 and Figure 4 The second matching portion 311 is fixed to the second annular groove 403, the inner groove side surface 409 and the outer groove side surface 410 of the second annular groove 403 respectively abut the inner peripheral surface 309 and the outer peripheral surface 308 of the second matching portion 311, and the groove bottom surface 422 of the second annular groove 403 abuts the end surface of the second matching portion 311. The first cavity 201, the third cavity 401 and the second cavity 301 are connected in sequence to form the accommodating cavity 500.

[0057] Continue to refer Figure 3The battery cell 100 is disposed in the accommodating cavity 500. Along the Y-axis direction, the positive electrode ear 101 and the negative electrode ear 102 of the battery cell 100 are disposed opposite to each other at the two ends of the battery cell 100. The positive electrode ear 101 faces the cavity bottom surface 202 of the first cavity 201, and the positive electrode ear 101 is electrically connected to the cavity bottom surface 202 of the first cavity 201, so as to realize the electrical connection between the positive electrode ear 101 and the first shell 200. The negative electrode ear 102 faces the cavity bottom surface 302 of the second cavity 301, and the negative electrode ear 102 is electrically connected to the cavity bottom surface 302 of the second cavity 301, so as to realize the electrical connection between the negative electrode ear 102 and the second shell 300.

[0058] In the battery 1000 provided in the embodiment of the present application, the first shell 200 and the second shell 300 can both be made of conductive metal, and then the first shell 200 and the second shell 300 can be set as the positive and negative poles of the battery 1000. The insulating member separates the first shell 200 and the second shell 300, so that the first shell 200 and the second shell 300 are insulated from each other. On the one hand, the battery 1000 does not need to be provided with a pole, the battery cover does not need to be provided with a pole hole, and the battery cover does not need to be riveted with the pole, the seal and the insulating member to achieve the sealing of the pole hole and the insulation of the pole and the cover. The battery cover can be directly integrated with the shell of the battery 1000, which simplifies the structure and assembly process of the battery, thereby reducing the cost. In addition, the battery can omit the insulating member and the seal at the battery cover, reduce the structural parts in the battery, and increase the capacity of the battery.

[0059] On the other hand, the first connecting portion 425 and the second connecting portion 426 of the insulating member 400 are provided with a first annular groove 402 and a second annular groove 403, the first matching portion 210 is fixed to the first annular groove 402, the inner groove side surface 406 and the outer groove side surface 407 of the first annular groove 402 respectively abut against the inner peripheral surface 209 and the outer peripheral surface 208 of the first matching portion 210, and the groove bottom surface 421 of the first annular groove 402 abuts against the end surface of the first matching portion 210. The second matching portion 311 is fixed to the second annular groove 403, the inner groove side surface 409 and the outer groove side surface 410 of the second annular groove 403 respectively abut against the inner peripheral surface 309 and the outer peripheral surface 308 of the second matching portion 311, and the groove bottom surface 422 of the second annular groove 403 abuts against the end surface of the second matching portion 311.

[0060] It can be understood that the first shell 200 is provided with an open end, that is, the first matching portion 210 is wrapped by the first annular groove 402, and the second shell 300 is provided with an open end, that is, the second matching portion 311 is wrapped by the second annular groove 403. This makes the sealing of the connection position between the first shell 200, the second shell 300 and the insulating member 400 better. That is, the sealing of the battery 1000 is better, and the battery 1000 does not need additional glue sealing, which optimizes the production process, thereby meeting the performance requirements of the battery while reducing the cost.

[0061] In this embodiment, the battery 1000 is a cylindrical battery. Correspondingly, the first shell 200, the second shell 300 and the insulating member 400 are cylindrical in shape, the cavity contours of the first cavity 201, the second cavity 301 and the third cavity 401 are also cylindrical, and the annular contours of the first annular groove 402 and the second annular groove 403 are circular.

[0062] In other embodiments, the battery 1000 may also be configured as a rectangular parallelepiped battery, a cube battery, a polygonal battery, etc. The shapes of the first shell 200, the second shell 300 and the insulating member 400 may also be configured as a rectangular parallelepiped, a cube, a polygon, etc., the cavity contours of the first cavity 201, the second cavity 301 and the third cavity 401 may also be configured as a rectangular parallelepiped, a cube, a polygon, etc., and the annular contours of the first annular groove 402 and the second annular groove 403 may also be configured as a rectangle, a square, a polygon, etc.

[0063] That is, the shapes of the battery 1000, the first shell 200, the second shell 300 and the insulating member 400 are not restricted, the cavity contours of the first cavity 201, the second cavity 301 and the third cavity 401 are not restricted, and the annular contours of the first annular groove 402 and the second annular groove 403 are not restricted.

[0064] In some embodiments, please refer to Figure 2 and Figure 3 In some embodiments, the first housing 200 includes a first sleeve 203 and a first cover plate 204. The first sleeve 203 has openings at opposite ends along the length direction of the battery 1000. The first cover plate 204 is fixed to the opening of the first sleeve 203 away from the insulating member 400. The first cover plate 204 and the first sleeve 203 enclose a first cavity 201. The first connecting portion 425 or the first matching portion 210 is disposed at one end of the first sleeve 203 away from the first cover plate 204.

[0065] The second housing 300 includes a second sleeve 303 and a second cover plate 304. The second sleeve 303 has openings at opposite ends. The second cover plate 304 is fixed to the opening of the second sleeve 303 away from the insulating member 400. The second cover plate 304 and the second sleeve 303 enclose a second cavity 301. The second connecting portion 426 or the second matching portion 311 is disposed at one end of the second sleeve 303 away from the second cover plate 304. Figure 2 and Figure 3 In this embodiment, the first matching portion 210 is disposed at the end of the first sleeve 203 facing the insulating member 400 , and the second matching portion 311 is disposed at the end of the second sleeve 303 facing the insulating member 400 .

[0066] Along the Y-axis direction, the first cavity 201 passes through the opposite ends of the first sleeve 203, and the first cover plate 204 is welded and fixed to the opening of the first sleeve 203 away from the insulating member 400, and closes the opening of the first sleeve 203. Along the Y-axis direction, the second cavity 301 passes through the opposite ends of the second sleeve 303, and the second cover plate 304 is fixed to the opening of the second sleeve 303 away from the insulating member 400, and closes the opening of the second sleeve 303.

[0067] By configuring the first housing 200 as the first sleeve 203 and the first cover plate 204, and configuring the second housing 300 as the second sleeve 303 and the second cover plate 304. On the one hand, when producing the battery 1000, the first sleeve 203, the insulating member 400 and the second sleeve 303 are assembled first, and then the battery cell 100 is first installed in the accommodating cavity 500, and finally the first cover plate 204 is fixed to the opening of the first housing 200, and the second cover plate 304 is fixed to the opening of the second housing 300. The assembly is convenient, the production efficiency is improved, and the production cost is reduced.

[0068] On the other hand, the insulating part 400 is processed by nano injection molding. When processing the insulating part 400, the first sleeve 203 and the first sleeve 203 can be placed in the injection mold and nano injection molded together with the insulating part 400. The first matching portion 210 of the first sleeve 203 can be more firmly fixed in the first annular groove 402, the inner groove side surface 406 and the outer groove side surface 407 of the first annular groove 402 are more closely fitted to the inner circumferential surface 209 and the outer circumferential surface 208 of the first matching portion 210, and the groove bottom surface 421 of the first annular groove 402 is more closely fitted to the end surface of the first matching portion 210.

[0069] The second matching part 311 can be more firmly fixed in the second annular groove 403, the inner groove side 409 and the outer groove side 410 of the second annular groove 403 are more closely fitted to the inner circumferential surface 309 and the outer circumferential surface 308 of the second matching part 311, and the groove bottom surface 422 of the second annular groove 403 is more closely fitted to the end surface of the second matching part 311. The sealing between the first shell 200, the insulating part 400 and the second shell 300 is better, and the sealing of the battery 1000 is better. The battery 1000 can be sealed without applying sealant, which simplifies the process. After the injection molding of the insulating part 400 is completed, the assembly of the first sleeve 203, the second sleeve 303 and the insulating part 400 is completed, which improves the production efficiency and reduces the production cost.

[0070] In some embodiments, please refer to Figure 2 and Figure 5 The first matching portion 210 fixed to the first annular groove 402 is provided with a first clamping member 205, and a second clamping member 412 is provided in the first annular groove 402. The first clamping member 205 and the second clamping member 412 are fixedly connected.

[0071] Specifically, the number of the first clamping member 205 and the second clamping member 412 is multiple, and the multiple first clamping members 205 are arranged on the first matching portion 210, and the multiple first clamping members 205 are arranged at intervals around the axial direction of the first matching portion 210. Correspondingly, the number of the second clamping members 412 is multiple, and the multiple second clamping members 412 are arranged in the first annular groove 402, and the multiple second clamping members 412 are arranged at intervals around the axial direction of the annular groove. When the first matching portion 210 is fixed to the first annular groove 402, the multiple first clamping members 205 and the multiple second clamping members 412 are clamped and fixed. The relative axial movement and radial movement of the first shell 200 and the insulating member 400 are limited, and the first shell 200 is prevented from loosening when the first shell 200 is subjected to axial tension and radial tension, thereby improving the stability of the connection between the first shell 200 and the insulating member 400. The situation of poor battery sealing due to loosening of the first shell 200 is avoided, and the sealing of the battery 1000 is better.

[0072] In some embodiments, please refer to Figure 2 and Figure 5 The first clamping member 205 includes a first groove 206 and a first protrusion 207. The first groove 206 is recessed on the outer circumferential surface 208 of the first matching portion 210, and the first protrusion 207 is protruded on the inner circumferential surface 209 of the first matching portion 210. The second clamping member 412 includes a second groove 413 and a second protrusion 414. The second groove 413 is recessed on the inner groove side surface 406 of the first annular groove 402, and the second protrusion 414 is protruded on the outer groove side surface 407 of the first annular groove 402.

[0073] Alternatively, the first groove 206 is recessed on the inner circumferential surface 209 of the first matching portion 210, and the first protrusion 207 is protruded on the outer circumferential surface 208 of the first matching portion 210. The second groove 413 is recessed on the outer groove side surface 407 of the first annular groove 402, and the second protrusion 414 is protruded on the inner groove side surface 406 of the first annular groove 402. The first protrusion 207 is clamped in the second groove 413, and the second protrusion 414 is clamped in the first groove 206.

[0074] For details, please refer to Figure 2 and Figure 5 A plurality of first clips 205 are formed by stamping from the outer circumferential surface 208 of the first matching portion 210 toward the inner circumferential surface 209 of the first matching portion 210 , so that a plurality of first grooves 206 are formed on the outer circumferential surface 208 of the first matching portion 210 , and a plurality of first protrusions 207 are formed on the inner circumferential surface 209 of the first matching portion 210 .

[0075] Correspondingly, the inner groove side surface 406 of the first annular groove 402 is provided with a plurality of second grooves 413, and the outer groove side surface 407 of the first annular groove 402 is provided with a plurality of second protrusions 414. When the insulating member 400 is separately injection molded, after the insulating member 400 is processed, it is assembled with the first housing 200, and the plurality of first protrusions 207 are clamped in the plurality of second grooves 413, and the plurality of second protrusions 414 are clamped in the plurality of first grooves 206.

[0076] In other embodiments, the insulating member 400 and the first sleeve 203 of the first housing 200 are injection molded, and the molten plastic fills the plurality of first grooves 206, so that the outer groove side surface 407 of the first annular groove 402 forms a plurality of second protrusions 414 that engage with the first grooves 206. The first protrusions 207 occupy the position of the mold cavity, so that the inner groove side surface 406 of the first annular groove 402 forms a second groove 413 that engages with the first protrusions 207.

[0077] In other embodiments, multiple first clips 205 are formed by stamping from the inner circumferential surface 209 of the first matching portion 210 toward the outer circumferential surface 208 of the first matching portion 210, so that the outer circumferential surface 208 of the first matching portion 210 forms multiple first protrusions 207 and the inner circumferential surface 209 of the first matching portion 210 forms a first groove 206.

[0078] Correspondingly, the outer groove side surface 407 of the first annular groove 402 is provided with a plurality of second grooves 413, and the inner groove side surface 406 of the first annular groove 402 is provided with a plurality of second protrusions 414. When the insulating member 400 is separately injection molded, after the insulating member 400 is processed, it is assembled with the first housing 200, and the plurality of first protrusions 207 are clamped in the plurality of second grooves 413, and the plurality of second protrusions 414 are clamped in the plurality of first grooves 206.

[0079] In other embodiments, the insulating member 400 and the first sleeve 203 of the first housing 200 are injection molded, the molten plastic fills the plurality of first grooves 206, and the inner groove side surface 406 of the first annular groove 402 forms a plurality of second protrusions 414 that engage with the first grooves 206. The first protrusion 207 occupies the position of the mold cavity, so that the outer groove side surface 407 of the first annular groove 402 forms a second groove 413 that engages with the first protrusion 207.

[0080] By setting the first protrusion 207 to be clamped in the second groove 413, and the second protrusion 414 to be clamped in the first groove 206, the relative axial movement and radial movement of the first shell 200 and the insulating member 400 are limited, and the first shell 200 is prevented from loosening when the first shell 200 is subjected to axial tension and radial tension, thereby improving the stability of the connection between the first shell 200 and the insulating member 400. The problem of poor sealing of the battery 1000 due to loosening of the first shell 200 is avoided, so that the sealing of the battery 1000 is better.

[0081] In some embodiments, please refer to Figure 2 and Figure 5 The second matching portion 311 fixed to the second annular groove 403 is provided with a third clamping member 305, and the second annular groove 403 is provided with a fourth clamping member 415. The third clamping member 305 and the fourth clamping member 415 are fixedly connected.

[0082] Specifically, there are multiple third clamping components 305 and multiple fourth clamping components 415 . Multiple third clamping components 305 are disposed on the second matching portion 311 , and multiple third clamping components 305 are arranged at intervals around the axial direction of the second matching portion 311 .

[0083] Correspondingly, there are multiple fourth clamping members 415, and multiple fourth clamping members 415 are disposed in the second annular groove 403, and multiple fourth clamping members 415 are arranged at intervals around the axial direction of the second annular groove 403. When the second matching portion 311 is fixed to the second annular groove 403, multiple third clamping members 305 and multiple fourth clamping members 415 are clamped and fixed. The relative axial movement and radial movement of the second shell 300 and the insulating member 400 are limited, and the second shell 300 is prevented from loosening when the battery 1000 is subjected to axial tension and radial tension, thereby avoiding the problem of poor sealing of the battery 1000 due to loosening of the second shell 300, and making the sealing of the battery 1000 better.

[0084] In some embodiments, please refer to Figure 2 and Figure 5 The third clamping member 305 includes a third groove 306 and a third protrusion 307. The third groove 306 is recessed on the outer circumferential surface 308 of the second matching portion 311, and the third protrusion 307 is protruded on the inner circumferential surface 309 of the second matching portion 311. The fourth clamping member 415 includes a fourth groove 416 and a fourth protrusion 417. The fourth groove 416 is recessed on the inner groove side surface 409 of the second annular groove 403. The fourth protrusion 417 is protruded on the outer groove side surface 410 of the second annular groove 403.

[0085] Alternatively, the third groove 306 is recessed in the inner circumferential surface 309 of the second matching portion 311, and the third protrusion 307 is protruded in the outer circumferential surface 308 of the second matching portion 311. The fourth groove 416 is recessed in the outer groove side surface 410 of the second annular groove 403. The fourth protrusion 417 is protruded in the inner groove side surface 409 of the second annular groove 403. The third protrusion 307 is clamped in the fourth groove 416, and the fourth protrusion 417 is clamped in the third groove 306.

[0086] For details, please refer to Figure 2 and Figure 5A plurality of third clips 305 are formed by stamping from the outer circumferential surface 308 of the second matching portion 311 toward the inner circumferential surface 309 of the second matching portion 311 , so that a plurality of third grooves 306 are formed on the outer circumferential surface 308 of the second matching portion 311 , and a plurality of third protrusions 307 are formed on the inner circumferential surface 309 of the second matching portion 311 .

[0087] Correspondingly, the inner groove side surface 409 of the second annular groove 403 is provided with a plurality of fourth grooves 416, and the outer groove side surface 410 of the second annular groove 403 is provided with a plurality of fourth protrusions 417. When the insulating member 400 is separately injection molded, after the insulating member 400 is processed, it is assembled with the second housing 300, and the plurality of third protrusions 307 are clamped in the plurality of fourth grooves 416, and the plurality of fourth protrusions 417 are clamped in the plurality of third grooves 306.

[0088] In other embodiments, the insulating member 400 and the second sleeve 303 of the second housing 300 are injection molded, and the molten plastic fills the plurality of third grooves 306, so that the outer groove side surface 410 of the second annular groove 403 forms a plurality of fourth protrusions 417 that are engaged with the third grooves 306. The third protrusions 307 occupy the position of the mold cavity, so that the inner groove side surface 409 of the insulating member 400 forms the fourth groove 416 that is engaged with the third protrusions 307.

[0089] In other embodiments, multiple third clips 305 are stamped from the inner circumferential surface 309 of the second matching portion 311 toward the outer circumferential surface 308 of the second matching portion 311, so that the outer circumferential surface 308 of the second matching portion 311 forms multiple third protrusions 307, and the inner circumferential surface 309 of the second matching portion 311 forms a third groove 306.

[0090] Correspondingly, the outer groove side surface 410 of the second annular groove 403 is provided with a plurality of fourth grooves 416, and the inner groove side surface 409 of the second annular groove 403 is provided with a plurality of fourth protrusions 417. When the insulating member 400 is separately injection molded, after the insulating member 400 is processed, it is assembled with the second housing 300, and the plurality of third protrusions 307 are clamped in the plurality of fourth grooves 416, and the plurality of fourth protrusions 417 are clamped in the plurality of third grooves 306.

[0091] In other embodiments, the insulating member 400 and the second sleeve 303 of the second housing 300 are injection molded, and the molten plastic fills the plurality of third grooves 306, so that the inner groove side surface 409 of the second annular groove 403 forms a plurality of fourth protrusions 417 that are engaged with the third grooves 306. The third protrusions 307 occupy the position of the mold cavity, so that the outer groove side surface 410 of the insulating member 400 forms the fourth groove 416 that is engaged with the third protrusions 307.

[0092] By providing the third protrusion 307 to be engaged with the fourth groove 416, and the fourth protrusion 417 to be engaged with the third groove 306, the relative axial movement and radial movement of the second shell 300 and the insulating member 400 are limited, and the second shell 300 is prevented from being loosened due to the axial tension and radial tension, and the problem of poor sealing of the battery 1000 due to the looseness of the second shell 300 is avoided, so that the sealing of the battery 1000 is better.

[0093] In some embodiments, please refer to Figure 2 , Figure 3 and Figure 6 The insulating member 400 is provided with an explosion-proof groove 418, which is recessed in the outer circumferential surface 419 of the insulating member 400 or the inner circumferential surface 420 of the insulating member 400, and is located between the groove bottom surface 421 of the first annular groove 402 and the groove bottom surface 422 of the second annular groove 403.

[0094] Specifically, the explosion-proof groove 418 has a conical shape. In other embodiments, the explosion-proof valve 600 may have an arc shape or a countersunk hole shape, and the shape of the explosion-proof groove 418 is not limited.

[0095] In this embodiment, please refer to Figure 6 The explosion-proof groove 418 is recessed in the outer circumferential surface 419 of the insulating member 400, and the end with a smaller diameter faces the inner circumferential surface 420 of the insulating member 400. The thickness of the groove bottom surface 423 of the explosion-proof groove 418 and the inner circumferential surface 420 of the insulating member 400 is relatively small. When the battery 1000 fails, the gas pressure inside the battery 1000 increases, and the gas pressure inside the battery 1000 acts on the inner circumferential surface of the insulating member 400, causing the area with a smaller thickness of the insulating member 400, that is, the explosion-proof groove 418 area, to explode. The gas in the battery 1000 is discharged from the explosion area, and the battery 1000 is depressurized, thereby preventing the battery 1000 from exploding and improving the safety performance of the battery 1000.

[0096] In other embodiments, the thickness of the bottom surface 423 of the explosion-proof groove 418 and the inner circumferential surface 420 of the insulating member 400 can be adjusted according to the bursting pressure of the battery 1000 .

[0097] In other embodiments, please refer to Figure 7 , the insulating member 400 is not provided with an explosion-proof groove 418. The battery 1000 is provided with an explosion-proof valve 600, and the insulating member 400 is provided with an explosion-proof hole 424, which penetrates the outer circumference 419 and the inner circumference 420 of the insulating member 400, and the explosion-proof hole 424 is provided between the groove bottom surface 421 of the first annular groove 402 and the groove bottom surface 422 of the second annular groove 403. The explosion-proof valve 600 is fixed to the explosion-proof hole 424 and closes the explosion-proof hole 424.

[0098] Specifically, the material of the explosion-proof valve 600 is a heat-sensitive material or a pressure-sensitive material. The explosion-proof valve 600 fills the explosion-proof hole 424. When the battery 1000 fails, the temperature of the gas inside the battery 1000 rises and the air pressure increases. The higher temperature gas and the greater gas pressure act on the explosion-proof valve 600, and the explosion-proof valve 600 is heated and pressurized, causing the explosion-proof valve 600 to melt and loosen. The gas inside the battery 1000 can be discharged from the explosion-proof hole 424, and the battery 1000 can be depressurized, thereby avoiding the explosion of the battery 1000 and improving the safety performance of the battery 1000.

[0099] In some embodiments, please refer to Figure 2 and Figure 3 The battery 1000 further includes a first current collecting plate 700 and a second current collecting plate 800. The first current collecting plate 700 is disposed inside the first cavity 201, and along the Y-axis direction, the first current collecting plate 700 is located between the battery cell 100 and the first cover plate 204. The positive electrode tab 101 is electrically connected to the first cover plate 204 through the first current collecting plate 700.

[0100] The second current collecting plate 800 is disposed in the second cavity 301. Along the Y-axis direction, the second current collecting plate 800 is located between the battery cell 100 and the second cover plate 304. The negative electrode tab 102 is electrically connected to the second cover plate 304 through the second current collecting plate 800.

[0101] Along the Y-axis direction, the first cover plate 204 , the first current collecting plate 700 , the battery cell 100 , the second current collecting plate 800 and the second cover plate 304 are stacked in sequence.

[0102] Specifically, the first current collecting disc 700 and the second current collecting disc 800 are sheet structures. Along the Y-axis direction, the side of the first current collecting disc 700 facing the battery cell 100 is welded to the positive electrode tab 101, and the side of the first current collecting disc 700 facing the first cover plate 204 is welded to the first cover plate 204 to achieve electrical connection between the positive electrode tab 101 and the first cover plate 204.

[0103] Along the Y-axis direction, the side of the second current collecting plate 800 facing the battery cell 100 is welded to the negative electrode ear 102 , and the side of the second current collecting plate 800 facing the second cover plate 304 is welded to the second cover plate 304 to achieve electrical connection between the negative electrode ear 102 and the second cover plate 304 .

[0104] The positive electrode tab 101 is electrically connected to the first cover plate 204 through the first current collecting plate 700, and the negative electrode tab 102 is electrically connected to the second cover plate 304 through the second current collecting plate 800. The electrical connection is more stable, so that the battery 1000 can stably transmit electrical energy to the outside of the battery 1000.

[0105] In some embodiments, please refer to Figure 2 and Figure 3The first current collecting disc 700 is provided with a first elastic portion 701, and the second current collecting disc 800 is provided with a second elastic portion 801. Along the Y-axis direction, the first elastic portion 701 is convexly arranged toward the battery cell 100, and the first elastic portion 701 abuts against the battery cell 100. The second elastic portion 801 is convexly arranged toward the battery cell 100, and the second elastic portion 801 abuts against the battery cell 100.

[0106] Specifically, along the Y-axis direction, the first elastic portion 701 and the second elastic portion 801 are spaced apart from each other, the first elastic portion 701 is convex toward the second current collecting disk 800, and the second elastic portion 801 is convex toward the first current collecting disk 700. The battery cell 100 is disposed between the first elastic portion 701 and the second elastic portion 801.

[0107] There are multiple first elastic parts 701 , which are disposed on the edge of the first current collecting disk 700 , and are arranged axially at intervals around the first current collecting disk 700 . The multiple first elastic parts 701 protrude toward the battery cell 100 and abut against the end surface of the battery cell 100 .

[0108] There are multiple second elastic parts 801, which are arranged on the edge of the second current collecting disk 800, and are arranged axially at intervals around the second current collecting disk 800. The multiple second elastic parts 801 protrude toward the battery cell 100 and abut against the other end surface of the battery cell 100.

[0109] It can be understood that along the Y-axis direction, the first elastic part 701 and the second elastic part 801 are respectively arranged on opposite sides of the battery cell 100, and the first elastic part 701 applies an elastic force to the battery cell 100 in the direction of the second elastic part 801, and the second elastic part 801 applies an elastic force to the battery cell 100 in the direction of the first elastic part 701. That is, the battery cell 100 is supported by elastic forces in both the positive and negative directions of the Y-axis. When the battery 1000 is subjected to external impact, the battery cell 100 can be buffered by the elastic force, thereby avoiding the battery cell 100 from being damaged by external impact, thereby improving the service life of the battery 1000.

[0110] In some embodiments, please refer to Figure 2 and Figure 3 The second housing 300 is provided with a liquid injection hole 310, and along the Y-axis direction, the liquid injection hole 310 penetrates the cavity bottom surface of the second cavity 301 and the side of the cavity bottom surface away from the second cavity 301. That is, the liquid injection hole 310 is set on the second cover plate 304, and along the thickness direction of the second cover plate 304, the liquid injection hole 310 penetrates the second cover plate 304. The battery cell 100 is provided with a liquid injection cavity and a liquid injection port connected to the liquid injection cavity, and the liquid injection hole 310 is connected to the liquid injection port. The electrolyte can be added to the liquid injection cavity of the battery cell 100 through the liquid injection hole 310.

[0111] The embodiment of the present application also provides a battery pack, including a box and the battery 1000 provided in the embodiment of the present application. The box is provided with a storage cavity, and a plurality of batteries 1000 are fixed in the storage cavity, and the plurality of batteries are electrically connected.

[0112] The embodiment of the present application further provides an electric device, including the battery pack provided in the embodiment of the present application, the battery pack supplies power to the electric device, and the electric device may be a vehicle.

[0113] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea.

Claims

1. A housing assembly, characterized in that: include: A first shell, a second shell and an insulating member; the first shell is provided with a first cavity, the second shell is provided with a second cavity, and the insulating member is provided with a third cavity; The first connecting portion and the second connecting portion are respectively provided at opposite ends of the insulating member; the first shell and the second shell are respectively provided with a first matching portion and a second matching portion, or the first shell is provided with a first connecting portion, the second shell is provided with a second connecting portion, and the first matching portion and the second matching portion are respectively provided at opposite ends of the insulating member; Along the length direction of the housing assembly, the insulating member is located between the first housing and the second housing, the first connecting portion is provided with a first annular groove, and the second connecting portion is provided with a second annular groove; The first matching portion is fixed to the first annular groove, and the groove wall surface of the first annular groove abuts against the outer circumferential surface and the inner circumferential surface of the first matching portion; the second matching portion is fixed to the second annular groove, and the groove wall surface of the second annular groove abuts against the outer circumferential surface and the inner circumferential surface of the second matching portion; The first cavity, the third cavity and the second cavity are connected in sequence to form a accommodating cavity; the accommodating cavity is used to accommodate the battery cell, the first shell is used to be electrically connected to the positive electrode ear of the battery cell, and the second shell is used to be electrically connected to the negative electrode ear of the battery cell.

2. The housing assembly according to claim 1, characterized in that: The first matching portion is provided with a first clamping piece, and the first annular groove is provided with a second clamping piece; the first clamping piece and the second clamping piece are fixedly connected.

3. The housing assembly according to claim 2, characterized in that: The first clamping member includes a first groove and a first protrusion; the first groove is concavely arranged on the outer circumferential surface of the first matching portion, and the first protrusion is convexly arranged on the inner circumferential surface of the first matching portion; the second clamping member includes a second groove and a second protrusion, the second groove is concavely arranged on the inner groove side surface of the first annular groove, and the second protrusion is convexly arranged on the outer groove side surface of the first annular groove; Alternatively, the first groove is recessed on the inner circumferential surface of the first matching portion, and the first protrusion is recessed on the outer circumferential surface of the first matching portion; the second groove is recessed on the outer groove side surface of the first annular groove, and the second protrusion is recessed on the inner groove side surface of the first annular groove; The first protrusion is clamped in the second groove, and the second protrusion is clamped in the first groove.

4. The housing assembly according to claim 1, characterized in that: The second matching portion is provided with a third clamping piece, and the second annular groove is provided with a fourth clamping piece; the third clamping piece is fixedly connected to the fourth clamping piece.

5. The housing assembly according to claim 4, characterized in that: The third clamping member includes a third groove and a third protrusion; the third groove is recessed on the outer circumferential surface of the second matching portion, and the third protrusion is recessed on the inner circumferential surface of the second matching portion; the fourth clamping member includes a fourth groove and a fourth protrusion, the fourth groove is recessed on the inner groove side surface of the second annular groove; the fourth protrusion is recessed on the outer groove side surface of the second annular groove; Alternatively, the third groove is recessed on the inner circumferential surface of the second matching portion, and the third protrusion is recessed on the outer circumferential surface of the second matching portion; the fourth groove is recessed on the outer groove side of the second annular groove; the fourth protrusion is recessed on the inner groove side of the second annular groove; the third protrusion is clamped to the fourth groove, and the fourth protrusion is clamped to the third groove.

6. The housing assembly according to claim 1, characterized in that: The insulating member is provided with an explosion-proof groove, which is recessed on the outer circumferential surface of the insulating member or the inner circumferential surface of the insulating member, and is located between the groove bottom surface of the first annular groove and the groove bottom surface of the second annular groove.

7. The housing assembly according to claim 1, characterized in that: It also includes an explosion-proof valve, the insulating part is provided with an explosion-proof hole, the explosion-proof hole passes through the outer circumference and the inner circumference of the insulating part, the explosion-proof hole is arranged between the bottom surface of the first annular groove and the bottom surface of the second annular groove; the explosion-proof valve is fixed to the explosion-proof hole and closes the explosion-proof hole.

8. The housing assembly according to claim 1, characterized in that: The first housing comprises a first sleeve and a first cover plate. Along the length direction of the housing assembly, opposite ends of the first sleeve are open; the first cover plate is fixed to the opening of the first sleeve away from the insulating member, and the first cover plate and the first sleeve enclose the first cavity; the first connecting portion or the first matching portion is arranged at one end of the first sleeve away from the first cover plate; The second shell includes a second sleeve and a second cover plate. The second sleeve has openings at opposite ends. The second cover plate is fixed to the opening of the second sleeve away from the insulating member. The second cover plate and the second sleeve enclose the second cavity. The second connecting portion or the second matching portion is arranged at an end of the second sleeve away from the second cover plate.

9. The housing assembly according to claim 8, characterized in that: It also includes a first current collecting disk and a second current collecting disk; the first current collecting disk is disposed inside the first cavity, the first current collecting disk is stacked on the first cover plate, and the first current collecting disk is electrically connected to the first cover plate, and the first current collecting disk is used to be electrically connected to the positive electrode ear of the battery cell; The second current collecting disk is disposed in the second cavity, is stacked on the second cover plate, is electrically connected to the second cover plate, and is used to be electrically connected to the negative electrode tab of the battery cell.

10. The housing assembly according to claim 9, characterized in that: The first current collecting disc is provided with a first elastic portion, and the second current collecting disc is provided with a second elastic portion; along the axial direction of the housing assembly, the first elastic portion protrudes toward the second current collecting disc; and the second elastic portion protrudes toward the first current collecting disc.

11. A battery, characterized in that: It comprises a battery cell and a shell assembly according to any one of claims 1 to 10, wherein the battery cell comprises a positive electrode ear and a negative electrode ear, and the battery cell is arranged in the accommodating cavity; the first shell is electrically connected to the positive electrode ear, and the second shell is electrically connected to the negative electrode ear.

12. The battery according to claim 11, characterized in that The second shell is provided with an injection hole, and along the axial direction of the second shell, the injection hole passes through the bottom surface of the second cavity and the side of the cavity away from the bottom surface of the second cavity; the battery cell is provided with an injection cavity and an injection port connected to the injection cavity, and the injection hole is connected to the injection port.

13. A battery pack, characterized in that: It comprises a box body and a plurality of batteries as claimed in claim 11 or 12; the box body is provided with a storage cavity, and the plurality of batteries are fixed in the storage cavity.

14. An electrical device, characterized in that: Including the battery pack as described in claim 13, the battery pack supplies power to the electrical device.

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