Secondary battery and battery pack

Abstract

The utility model discloses a secondary battery and a battery pack, and belongs to the technical field of batteries, the secondary battery comprises a shell, a bottom cover, an insulating part and a supporting part, the shell is provided with an accommodating cavity; the bottom cover is connected with one end, in the first direction, of the shell and covers the containing cavity, and the bottom cover is provided with an anti-explosion valve; the insulating part is arranged in the containing cavity and connected with the bottom cover, the insulating part is provided with a containing groove facing the anti-explosion valve, a through hole is formed in the insulating part, and the through hole is communicated with the containing groove; the supporting piece is arranged in the accommodating groove and is connected with one side, close to the insulating piece, of the bottom cover; the supporting piece comprises a first part and a second part, the second part is connected with the side, deviating from the anti-explosion valve, of the first part in the first direction, exhaust holes penetrate through the first part and the second part, a through groove is formed between the first part and the second part, and the through groove communicates with the exhaust holes and the containing groove. According to the explosion-proof valve, the supporting piece placed in the insulating piece containing groove is arranged to support the electrode assembly, so that the electrode assembly is prevented from directly pressing the explosion-proof valve, and the damage probability of the explosion-proof valve is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a secondary battery and battery pack. Background Technology

[0002] The bottom cover assembly of the secondary battery has an explosion-proof valve. When the secondary battery experiences thermal runaway, the explosion-proof valve will rupture and release the high-pressure gas inside the secondary battery to reduce the internal pressure and prevent the secondary battery from exploding.

[0003] However, when the explosion-proof valve is located at the bottom of the secondary battery, the electrode assembly may squeeze the explosion-proof valve under the action of gravity, causing damage to the explosion-proof valve. Utility Model Content

[0004] The purpose of this utility model is to provide a secondary battery to solve the technical problem that the electrode assembly may squeeze the explosion-proof valve and cause damage to the explosion-proof valve under the action of gravity; another purpose of this application is to provide a battery pack.

[0005] Technical solution: This application provides a secondary battery with a first orientation. The secondary battery includes:

[0006] The shell has a receiving cavity;

[0007] A bottom cover is connected to one end of the housing along the first direction and seals the receiving cavity; the bottom cover is equipped with an explosion-proof valve.

[0008] An insulating component is disposed within the receiving cavity and connected to the bottom cover. The insulating component has a receiving groove facing the explosion-proof valve. The bottom wall of the receiving groove has a through hole that communicates with the receiving groove.

[0009] A support member is disposed in the receiving groove and connected to the bottom cover on the side near the insulating member; the support member includes a first part and a second part, the second part is connected to the first part on the side away from the explosion-proof valve along the first direction, the first part and the second part are provided with exhaust holes, and a through groove is formed between the first part and the second part, the through groove connecting the exhaust holes and the receiving groove.

[0010] In some embodiments, the support member further includes a connecting portion located between the first portion and the second portion along the first direction and connecting the first portion and the second portion respectively, wherein the first portion, the second portion and the connecting portion surround to form the through groove.

[0011] In some embodiments, the connecting portion extends from the edge of the first portion near the vent hole to the edge away from the vent hole.

[0012] In some embodiments, the insulating element includes:

[0013] The main body is connected to the bottom cover on one side facing the receiving cavity along the first direction;

[0014] The protrusion is connected to the main body and protrudes along the first direction toward the side opposite to the bottom cover to form the receiving groove. The protrusion is provided with the through hole.

[0015] In some embodiments, the number of connecting portions is multiple, the support member has multiple through slots, and the multiple connecting portions are arranged circumferentially spaced along the first portion; adjacent two connecting portions, the first portion and the second portion surround to form the through slots.

[0016] In some embodiments, the bottom cover is provided with a through pressure relief hole, the explosion-proof valve cover seals the pressure relief hole, and the bottom cover is provided with a limiting groove on the side facing the receiving groove, the limiting groove is connected to the receiving groove, and the limiting groove is spaced apart from the pressure relief hole;

[0017] The support member further includes a support portion connected to the first portion on one side facing the bottom cover along the first direction, and at least a portion of the support portion is disposed within the limiting groove.

[0018] In some embodiments, along the first direction, the maximum size of the support portion is greater than the maximum size of the limiting groove.

[0019] In some embodiments, the bottom cover has a plurality of limiting grooves, which are arranged around the pressure relief hole; the support member includes a plurality of support portions, which are respectively disposed in the plurality of limiting grooves, and one support member is disposed in one limiting groove.

[0020] In some embodiments, the insulating element includes a plurality of through holes arranged in an array.

[0021] Accordingly, this application also provides a battery pack, including a secondary battery as described in any of the above embodiments.

[0022] Beneficial Effects: Compared with the prior art, the secondary battery provided in this application includes a shell, a bottom cover, an insulating component, and a support component. The shell has a receiving cavity; the bottom cover is connected to one end of the shell along a first direction and seals the receiving cavity, and the bottom cover is provided with an explosion-proof valve; the insulating component is disposed in the receiving cavity and connected to the bottom cover, and the insulating component has a receiving groove facing the explosion-proof valve, and the insulating component has a through hole communicating with the receiving groove; the support component is disposed in the receiving groove; the support component includes a first part and a second part, the first part is connected to the side of the bottom cover near the insulating component, and the second part is connected to the side of the first part along the first direction away from the explosion-proof valve, the first part and the second part have a through vent hole, and a through groove is formed between the first part and the second part, the through groove communicating with the vent hole and the receiving groove. This application provides a support component placed in the receiving groove of the insulating component to support the electrode assembly, thereby avoiding the electrode assembly directly pressing against the explosion-proof valve, reducing the probability of damage to the explosion-proof valve, and improving the reliability of the secondary battery. Attached Figure Description

[0023] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0024] Figure 1 An exploded view of a secondary battery provided in an embodiment of this application;

[0025] Figure 2 A cross-sectional view of a secondary battery provided in an embodiment of this application;

[0026] Figure 3 for Figure 2 Detailed view of section A in the middle frame;

[0027] Figure 4 for Figure 2 Another detail view of section A in the middle frame;

[0028] Figure 5 A schematic diagram of the structure of the support member for the secondary battery provided in an embodiment of this application;

[0029] Figure 6 A schematic diagram of the structure of a support member for a secondary battery provided in another embodiment of this application;

[0030] Figure 7 A schematic diagram of the structure of the insulating component of the secondary battery provided in the embodiments of this application;

[0031] Figure 8 A bottom view of the bottom cover of the secondary battery provided in an embodiment of this application;

[0032] Figure 9 A bottom view of the insulating component of a secondary battery provided in another embodiment of this application;

[0033] Reference numerals in the attached drawings: 100-shell, 110-receiving cavity, 200-bottom cover, 210-pressure relief hole, 220-limiting groove, 300-insulating component, 310-receiving groove, 320-through hole, 330-main body, 340-protrusion, 400-explosion-proof valve, 500-support component, 510-support part, 520-vent hole, 530-first part, 531-first hole wall, 532-first surface, 540-second part, 541-second hole wall, 542-second surface, 550-connecting part, 551-third hole wall, 552-third surface, 560-through groove, 600-electrode assembly, X-second direction, Y-third direction, Z-first direction. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0036] It should also be noted that in the accompanying drawings of the embodiments of this application, the arrows labeled X, Y, and Z respectively represent the second direction X, the third direction Y, and the first direction Z. The description of this application introduces the second direction X, the third direction Y, and the first direction Z to more clearly express the relative positional relationship involved in this application. The second direction X, the third direction Y, and the first direction Z are three intersecting relative directions, not absolute directions. In practical applications, the second direction X, the third direction Y, and the first direction Z can point to any direction in space, as long as the intersection relationship between them is maintained.

[0037] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0038] The bottom cover 200 assembly of the secondary battery has an explosion-proof valve 400. When the secondary battery experiences thermal runaway, the explosion-proof valve 400 will rupture and release the high-pressure gas inside the secondary battery to reduce the pressure inside the secondary battery and prevent the secondary battery from exploding.

[0039] However, when the explosion-proof valve 400 is located below the secondary battery, the electrode assembly 600 may squeeze the explosion-proof valve 400 under the action of gravity, causing damage to the explosion-proof valve 400.

[0040] To address the technical problem that the electrode assembly 600 might damage the explosion-proof valve 400, the first embodiment of this application provides a secondary battery. Please refer to... Figure 1 The secondary battery includes a housing 100, a bottom cover 200, an insulating component 300, and a support component 500. The housing 100 has a receiving cavity 110. The bottom cover 200 is connected to one end of the housing 100 along a first direction Z and seals the receiving cavity 110. The bottom cover 200 is provided with an explosion-proof valve 400. The insulating component 300 is disposed in the receiving cavity 110 and connected to the bottom cover 200. The insulating component 300 has a receiving groove 310 facing the explosion-proof valve 400. The bottom wall of the receiving groove 310 has a through hole 320. 0 is connected to the receiving groove 310; the support member 500 is disposed in the receiving groove 310 and connected to the side of the bottom cover 200 near the insulating member 300; the support member 500 includes a first part 530 and a second part 540, the second part 540 is connected to the first part 530 along the first direction Z away from the explosion-proof valve 400, the first part 530 and the second part 540 are connected by an exhaust hole 520, and a through groove 560 is formed between the first part 530 and the second part 540, the through groove 560 connects the exhaust hole 520 and the receiving groove 310.

[0041] Specifically, the bottom cover 200 is provided with a pressure relief hole 210, and the explosion-proof valve 400 is connected to the bottom cover 200 and seals the pressure relief hole 210.

[0042] Specifically, the support member 500 is provided with an exhaust hole 520 that penetrates the first part 530 and the second part 540 along the first direction Z. The exhaust hole 520 penetrates the surface of the first part 530 away from the second part 540 along the first direction Z, and also penetrates the surface of the second part 540 away from the first part 530 along the first direction Z.

[0043] Specifically, the first part 530 and the second part 540 are spaced apart along the first direction Z to form a through groove 560.

[0044] Specifically, the receiving groove 310 facing the explosion-proof valve 400 allows the gas in the receiving groove 310 to pass through the damaged explosion-proof valve 400 and enter the pressure relief hole 210.

[0045] Specifically, the support member 500, which is disposed in the receiving groove 310 and has an exhaust hole 520, allows the gas entering the receiving groove 310 from the receiving cavity 110 through the through hole 320 to pass through the exhaust hole 520 to reach the explosion-proof valve 400, and can break through the explosion-proof valve 400 and be discharged from the pressure relief hole 210.

[0046] In some embodiments, the secondary battery further includes an electrode assembly 600 disposed in the receiving cavity 110 and connected to the side of the insulating member 300 opposite to the bottom cover 200 along the first direction Z.

[0047] In some embodiments, the vent 520 is provided with an opening on the side of the support member 500 facing the bottom cover 200 along the first direction Z toward the explosion-proof valve 400.

[0048] In some embodiments, along the first direction Z, the orthographic projection of the vent wall of the vent 520 onto the plane of the bottom cover 200 facing the electrode assembly 600 overlaps with the orthographic projection of the explosion-proof valve 400 onto the plane of the electrode assembly 600.

[0049] In some embodiments, along the first direction Z, the orthographic projection of the wall of the vent 520 onto the plane of the bottom cover 200 facing the electrode assembly 600 lies within the orthographic projection of the explosion-proof valve 400 onto the plane of the electrode assembly 600.

[0050] In some embodiments, along the first direction Z, the orthographic projection of the explosion-proof valve 400 onto the plane of the surface facing the electrode assembly 600 is located within the orthographic projection of the wall of the vent 520 onto the plane of the bottom cover 200 facing the electrode assembly 600, so as to avoid the support member 500 from contacting the explosion-proof valve 400, thereby reducing the possibility that the support member 500 may squeeze and damage the explosion-proof valve 400.

[0051] In other embodiments, along the first direction Z, the orthographic projection of the explosion-proof valve 400 onto the plane of the surface facing the electrode assembly 600 is spaced from the orthographic projection of the vent wall of the vent 520 onto the plane of the bottom cover 200 facing the electrode assembly 600.

[0052] In other embodiments, the support 500 has a plurality of vent holes 520.

[0053] In some embodiments, the support member 500 is connected to the bottom cover 200, and the first part 530 and the bottom cover 200 are spaced apart along a first direction Z, so that gas can flow from the vent hole 520 through the opening of the first part 530 to the explosion-proof valve 400. Furthermore, the spaced-apart arrangement of the first part 530 and the bottom cover 200 can form a gap to avoid weld excess during welding of the bottom cover 200 and the explosion-proof valve 400.

[0054] In some embodiments, the explosion-proof valve 400 and the support member 500 are spaced apart along a first direction Z.

[0055] In some embodiments, please refer to Figure 3 and Figure 4 The explosion-proof valve 400 is embedded in the bottom cover 200 on the side facing the electrode assembly 600 along the first direction Z, so as to reduce the possibility of the support 500 squeezing and damaging the explosion-proof valve 400.

[0056] Understandably, since the support member 500 is connected to the bottom cover 200 and the electrode assembly 600 is connected to the side of the insulating member 300 away from the bottom cover 200, when the electrode assembly 600 is pressed towards the bottom cover 200 in the first direction Z, the insulating member 300, the support member 500, and the bottom cover 200 are successively pressurized and support the electrode assembly 600, while the explosion-proof valve 400 does not receive pressure from the electrode assembly 600. Simultaneously, when the gas in the receiving cavity 110 needs to be discharged, the gas can enter the receiving cavity 110 through the through hole 320, then sequentially pass through the through groove 560 and the exhaust hole 520 to contact the explosion-proof valve 400, and then be discharged after the explosion-proof valve 400 ruptures.

[0057] In the above embodiments, by providing a through groove 560 between the bottom cover 200 and the electrode assembly 600 to form a support between them, the electrode assembly 600 is prevented from pressing against the explosion-proof valve 400, reducing the possibility of the explosion-proof valve 400 being damaged by pressure from the electrode assembly 600. Simultaneously, the through groove 560 and vent 520 on the support member 500 allow gas to pass through the support member 500 to reach the explosion-proof valve 400, reducing the possibility of the support member 500 blocking the explosion-proof valve 400, causing gas to be unable to escape or to have difficulty escaping, thereby improving the reliability of the secondary battery. Furthermore, placing the support member 500 in the receiving groove 310 of the insulating member 300 allows the support member 500 to be limited in the direction perpendicular to the first direction Z, reducing the possibility of gas being unable to escape or having difficulty escaping due to displacement of the support member 500, and also reducing the possibility of the electrode assembly 600 pressing against the explosion-proof valve 400 due to displacement of the support member 500, further improving the reliability of the secondary battery. Among them, the direction perpendicular to the first direction Z can be the second direction X and the third direction Y of the secondary battery.

[0058] In some embodiments, please refer to Figure 5 and Figure 6 The support member 500 also includes a connecting part 550, which is located between the first part 530 and the second part 540 along the first direction Z and connects the first part 530 and the second part 540 respectively. The first part 530, the second part 540 and the connecting part 550 form a through groove 560.

[0059] In the above embodiment, by providing a connecting portion 550 to separate the first portion 530 and the second portion 540 in the first direction Z to form a through groove 560 that penetrates the outer surface of the support member 500 and communicates with the exhaust hole 520 in a direction perpendicular to the first direction Z, gas can pass through the through groove 560 and the exhaust hole 520 in sequence, thereby passing through the support member 500 to reach the explosion-proof valve 400.

[0060] In some embodiments, please refer again Figure 5 and Figure 6 The connecting portion 550 extends from the edge of the first portion 530 near the exhaust port 520 to the edge away from the exhaust port 520.

[0061] In some embodiments, the vent 520 has a radial direction perpendicular to the first direction Z, the connecting portion 550 extends in the radial direction, and the end face of the connecting portion 550 near one end of the vent 520 in the radial direction forms the wall of the vent 520. In some embodiments, the end face of the connecting portion 550 away from the vent 520 in the radial direction is connected to the side peripheral surface of the first portion 530 and the side peripheral surface of the second portion 540. In some embodiments, the side peripheral surfaces of the first portion 530 and the second portion 540 are perpendicular to the radial direction.

[0062] Specifically, the first part 530 has a first hole wall 531 and a first surface 532 that are opposite to each other in a direction perpendicular to the first direction Z; the second part 540 has a second hole wall 541 and a second surface 542 that are opposite to each other in a direction perpendicular to the first direction Z; the connecting part 550 has a third hole wall 551 and a third surface 552 that are opposite to each other in a direction perpendicular to the first direction Z; wherein, in the first direction Z, the third hole wall 551 is disposed between the first hole wall 531 and the second hole wall 541, and the third hole wall 551 connects the first hole wall 531 and the second hole wall 541 respectively, and surrounds to form an exhaust hole 520; in the first direction Z, the third surface 552 is disposed between the first surface 532 and the second surface 542, and connects the first surface 532 and the second surface 542 respectively.

[0063] In some embodiments, a plurality of connecting portions 550 are arranged at circumferential intervals along the vent hole 520.

[0064] In some embodiments, the connecting portion 550 extends in a direction perpendicular to the first direction Z; in some embodiments, please refer to Figure 6, Figure 6 The vent 520 of the support member 500 is a circular hole, and the connecting part 550 extends in the radial direction of the vent 520.

[0065] In the above embodiment, since one end of the connecting part 550 can extend from the hole wall of the exhaust hole 520 to the outer peripheral surface of the support member 500, the length of the support member 500 can be extended as much as possible, thereby improving the support for the second part 540, reducing the possibility that the second part 540 will deform under pressure, resulting in a reduction in the flow cross-sectional area of ​​the through groove 560 and a reduction in the ability of the through groove 560 to flow gas, thereby improving the reliability of the support member 500 and thus improving the reliability of the secondary battery.

[0066] In some embodiments, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 7 The insulating component 300 includes a main body 330 and a protrusion 340. The main body 330 is connected to the bottom cover 200 on the side facing the receiving cavity 110 along the first direction Z. The protrusion 340 is connected to the main body 330 and protrudes along the first direction Z to the side away from the bottom cover 200 to form a receiving groove 310. The protrusion 340 is provided with a through hole 320.

[0067] In some embodiments, the insulating element 300 is attached to the side of the bottom cover 200 facing the electrode assembly 600 along the first direction Z.

[0068] In the above embodiment, the main body 330 is used to isolate the bottom cover 200 and other substances in the receiving cavity 110, and the protrusion 340 is used to form a receiving groove 310 to receive the support member 500 while ensuring the insulating function of the insulating member 300.

[0069] In some embodiments, please refer to Figure 5 and Figure 6 The number of connecting parts 550 is multiple, the support member 500 has multiple through slots 560, and the multiple connecting parts 550 are arranged at intervals along the circumference of the first part 530; two adjacent connecting parts 550, the first part 530 and the second part 540 surround to form a through slot 560.

[0070] In some embodiments, the connecting portions 550 are spaced apart along a second direction X; in some embodiments, the connecting portions 550 are spaced apart along a third direction Y; in some embodiments, the connecting portions 550 are arranged in a matrix.

[0071] It is understandable that the support member 500 may need to bear the pressure from the electrode assembly 600 along the first direction Z. In the above embodiment, by providing the support member 500 to support the second part 540, the possibility of the flow cross-sectional area of ​​the through groove 560 decreasing due to the deformation of the second part 540 towards the first part 530 under the pressure from the electrode assembly 600 is reduced, thereby reducing the gas flow capacity of the through groove 560. This improves the reliability of the support member 500 and, consequently, the reliability of the secondary battery.

[0072] In some embodiments, please refer to Figure 8 and Figure 9 The bottom cover 200 is provided with a through pressure relief hole 210, and the explosion-proof valve 400 covers the pressure relief hole 210. The bottom cover 200 is provided with a limiting groove 220 on the side facing the receiving groove 310. The limiting groove 220 is connected to the receiving groove 310 and is spaced apart from the pressure relief hole 210. The support member 500 also includes a support part 510, which is connected to the side of the first part 530 facing the bottom cover 200 along the first direction Z. At least a part of the support part 510 is provided in the limiting groove 220.

[0073] In some embodiments, the pressure relief hole 210 penetrates the bottom cover 200 along the first direction Z. In some embodiments, the bottom cover 200 has a mounting groove on the side facing the electrode assembly 600 along the first direction Z, the mounting groove communicating with the pressure relief hole 210, and the explosion-proof valve 400 is disposed in the mounting groove.

[0074] In some embodiments, the support portion 510 is entirely located within the limiting groove 220; in some embodiments, please refer to Figure 3 and Figure 4 Only the portion of the support part 510 that is away from the first part 530 along the first direction Z is located in the limiting groove 220.

[0075] In some embodiments, please refer to Figure 8 The limiting groove 220 and the pressure relief hole 210 are spaced apart along the second direction X, and the support part 510 is located on one side of the pressure relief hole 210 along the second direction X; in some embodiments, please refer to Figure 9 The limiting groove 220 and the pressure relief hole 210 are spaced apart along the third direction Y, and the support part 510 is located on the side of the pressure relief hole 210 along the third direction Y.

[0076] In the above embodiments, by providing a limiting groove 220 and a support portion 510 that can be disposed within the limiting groove 220, the bottom cover 200 can limit the support member 500 in a direction perpendicular to the first direction Z. This reduces the possibility that gas cannot be discharged or has difficulty in discharge due to displacement of the support member 500, and also reduces the possibility that the electrode assembly 600 will press against the explosion-proof valve 400 due to displacement of the support member 500, further improving the reliability of the secondary battery. In addition, using the bottom cover 200 to limit the support member 500 also reduces the possibility that friction between the support member 500 and the insulating member 300 will cause damage to the insulating member 300, further improving the reliability of the secondary battery and extending its service life.

[0077] In some embodiments, please refer to Figure 3 and Figure 4 Along the first direction Z, the maximum size of the support part 510 is greater than the maximum size of the limiting groove 220.

[0078] It is understandable that the dimension of the support part 510 in the first direction Z is larger than the dimension of the limiting groove 220 in the first direction Z. When the support part 510 is placed in the limiting groove 220, a gap will be formed between the first part 530 and the bottom cover 200.

[0079] In the above embodiment, by limiting the dimensional relationship between the support part 510 and the limiting groove 220, the support member 500 can be spaced apart from the bottom cover 200, thereby reducing the possibility of the first part 530 and the explosion-proof valve 400 coming into contact and rubbing against each other, thereby reducing the possibility of the explosion-proof valve 400 being damaged, and thus improving the reliability of the secondary battery.

[0080] In some embodiments, please refer again Figure 8 and Figure 9 The bottom cover 200 has multiple limiting grooves 220, which surround the pressure relief hole 210; the support member 500 includes multiple support parts 510, which are respectively disposed in the multiple limiting grooves 220, and one support member 500 is disposed in one limiting groove 220.

[0081] In some embodiments, the number of support members 500 and limiting grooves 220 is the same, and one support member 500 is provided in each limiting groove 220; in some embodiments, the number of limiting grooves 220 is greater than the number of support members 500, and each support member 500 is provided in one limiting groove 220. Multiple limiting grooves 220 can eliminate the need for personnel to identify the orientation of the support member 500 when installing it, thereby improving the assembly efficiency of the secondary battery.

[0082] In the above embodiments, the interaction between the multiple support members 500 and the multiple limiting grooves 220 can limit the rotation of the support members 500, further reducing the possibility that gas cannot be discharged or is difficult to discharge due to the displacement of the support members 500, and also reducing the possibility that the electrode assembly 600 will be compressed by the displacement of the support members 500, thus further improving the reliability of the secondary battery.

[0083] In some embodiments, please refer to Figure 7 The insulating element 300 includes a plurality of through holes 320, which are arranged in an array.

[0084] In some embodiments, portions of the plurality of through holes 320 are spaced apart along a second direction X, and portions of the plurality of through holes 320 are spaced apart along a third direction Y to form a rectangular array; in other embodiments, portions of the plurality of through holes 320 are spaced apart along any direction perpendicular to the first direction Z, and other portions of the plurality of through holes 320 are spaced apart along another direction perpendicular to the first direction Z.

[0085] In the above embodiment, providing multiple through holes 320 helps the gas to quickly enter the receiving groove 310, thereby improving the gas discharge efficiency.

[0086] In some embodiments, please refer to Figure 3 and Figure 4 The support 510 and the groove wall of the receiving groove 310 are spaced apart.

[0087] In some embodiments, the support member 500 and the receiving groove 310 are spaced apart along the first direction Z toward the groove wall of the bottom cover 200; in some embodiments, the support member 500 and the groove wall of the receiving groove 310 are spaced apart along a direction perpendicular to the first direction Z.

[0088] In the above embodiments, the support member 500 and the protrusion 340 are spaced apart to reduce the possibility of the support member 500 contacting and rubbing against the insulating member 300, thereby reducing the possibility of damage to the insulating member 300 and improving the reliability of the secondary battery.

[0089] Accordingly, this application also provides a battery pack including a secondary battery as described in any of the above embodiments.

[0090] The above provides a detailed description of a secondary battery and battery pack provided in the embodiments of this application. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A secondary battery characterized by comprising: The secondary battery has a first direction, and comprises: a housing having a receiving cavity; a bottom cover connected to one end of the housing along the first direction and covering the receiving cavity, the bottom cover being provided with an explosion-proof valve; an insulating member arranged in the receiving cavity and connected to the bottom cover, the insulating member being provided with a receiving groove facing the explosion-proof valve, a bottom wall of the receiving groove being provided with a through hole penetrating through and communicating with the receiving groove; a support member arranged in the receiving groove and connected to one side of the bottom cover close to the insulating member, the support member comprising a first part and a second part, the second part being connected to one side of the first part away from the explosion-proof valve along the first direction, the first part and the second part being provided with exhaust holes penetrating through, and a through groove being formed between the first part and the second part and communicating with the exhaust holes and the receiving groove.

2. The secondary battery according to claim 1, characterized by The support member further comprises a connecting part located between the first part and the second part along the first direction and connected to the first part and the second part respectively, and the first part, the second part and the connecting part surround to form the through groove.

3. The secondary battery according to claim 2, wherein the connecting part extends from an edge of the first part close to the exhaust hole to an edge away from the exhaust hole.

4. The secondary battery according to claim 2, characterized by The insulating member comprises: a main body part connected to one side of the bottom cover facing the receiving cavity along the first direction; a protruding part connected to the main body part, the protruding part being protruded away from the bottom cover along the first direction to form the receiving groove, and the protruding part being provided with the through hole.

5. The secondary battery according to claim 2, characterized by The number of the connecting parts is multiple, the support member has multiple through grooves, and multiple connecting parts are arranged at intervals along the circumference of the first part; and adjacent two connecting parts, the first part and the second part surround to form the through groove.

6. The secondary battery according to claim 1, wherein the bottom cover is provided with a pressure relief hole penetrating through, the explosion-proof valve covers the pressure relief hole, one side of the bottom cover facing the receiving groove is provided with a limiting groove, the limiting groove communicates with the receiving groove, and the limiting groove is arranged at intervals with the pressure relief hole; the support member further comprises a support part connected to one side of the first part facing the bottom cover along the first direction, and at least part of the support part is arranged in the limiting groove.

7. The secondary battery according to claim 6, characterized by In the first direction, the maximum size of the support part is greater than the maximum size of the limiting groove.

8. The secondary battery according to claim 6, characterized by The bottom cover has multiple limiting grooves, and multiple limiting grooves are arranged around the pressure relief hole; the support member comprises multiple support parts, multiple support parts are arranged in multiple limiting grooves respectively, and one support member is arranged in one limiting groove.

9. The secondary battery according to claim 1, characterized by The insulating member comprises multiple through holes, and multiple through holes are arranged in an array.

10. A battery pack, characterized by, The secondary battery comprises the secondary battery according to any one of claims 1-9.

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