Battery cell, battery and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a battery and an electric device. The battery monomer comprises a shell, an electrode assembly, an insulating component and a supporting component, the shell is provided with a first wall, a second wall and a pressure relief mechanism, and the pressure relief mechanism is arranged on the first wall; the insulating member is provided with a first exhaust channel. The first exhaust channel communicates with the first space and the second space; the supporting component is arranged in the shell and located between the first wall and the insulating component, a second exhaust channel is formed in the supporting component, and the second exhaust channel is used for communicating the first space with the second space; wherein the melting point of the supporting component is larger than that of the insulating component, the insulating component is provided with at least two planes which are connected with each other and form an included angle, and a second exhaust channel is defined by the at least two planes. According to the battery monomer, the battery and the power utilization device provided by the invention, the side welding seam cracking risk of the battery monomer can be reduced, and the use safety of the battery monomer is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery and an electrical device. Background Art

[0002] Batteries are increasingly used. Batteries are repeatedly charged and discharged during use, generating high temperatures. When a battery experiences thermal runaway, the exhaust channel between the electrode assembly and the pressure relief mechanism of the battery cell is easily closed, causing the side weld of the battery cell to crack. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, aiming to improve the technical problem that the side weld of the battery cell is prone to cracking in the case of thermal runaway.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell having a first wall, a second wall and a pressure relief mechanism, wherein the pressure relief mechanism is arranged on the first wall, and the first wall and the second wall are arranged to intersect; an electrode assembly, arranged in the shell; a first space is formed between the outer peripheral wall of the electrode assembly and the second wall; an insulating member, arranged in the shell and located between the first wall and the electrode assembly, a second space is formed between the insulating member and the pressure relief mechanism, and a first exhaust channel is provided on the insulating member; the first exhaust channel connects the first space and the second space; and a supporting member, arranged in the shell and located between the first wall and the insulating member, a second exhaust channel is provided on the supporting member, and the second exhaust channel is used to connect the first space and the second space; wherein the melting point of the supporting member is greater than the melting point of the insulating member, and the insulating member has at least two planes connected to each other and arranged at an angle, and at least two of the planes surround the second exhaust channel.

[0005] The battery cell provided in the embodiment of the present application has a first exhaust channel set in the insulating member, a support member with a higher melting point than the insulating member is added to the battery cell, and a second exhaust channel is set in the support member. In this way, the structural reliability of the support member can be higher than the structural reliability of the insulating member, and the battery cell can be exhausted to the location of the pressure relief mechanism through the first exhaust channel in the early stage of thermal runaway. After the first exhaust channel is melted in the late stage of thermal runaway, exhaust can be achieved with the help of the second exhaust channel, so that the battery cell provided in this embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell.

[0006] In addition, the insulating component has at least two planes that are interconnected and set at an angle, and all the planes or all the planes and the first wall are arranged to form a second exhaust channel. In this way, at least two planes in the insulating component can form a structure with a triangular cross-section similar to a triangular pyramid, a triangular prism, etc. with the first wall or the third plane, which is not easily squeezed and collapsed by the electrode assembly in the middle and late stages of thermal failure. The exhaust space of the second exhaust channel can be less likely to be compressed, so that the gas on the side where the main body of the electrode assembly is located can quickly reach the location of the pressure relief mechanism through the second exhaust channel, thereby achieving rapid pressure relief, which can improve the safety of battery cell use to a certain extent.

[0007] In some embodiments, the first end surface of the electrode assembly in the first direction is spaced apart from the second wall, and at least a portion of the first space is formed therebetween, and the position of the support member corresponds to the position of the first end surface. By adopting the solution provided in this embodiment, the support member can be located above at least a portion of the first space, so that the gas in the first space can quickly pass through the support member into the second space in the case of hot melting, thereby achieving rapid exhaust.

[0008] In some embodiments, the support member is spaced apart from the second wall, and the second exhaust channel penetrates the support member along a second direction, and the second direction is parallel to the first direction or is arranged at an angle to the first direction. In this way, after the insulating member is hot-melted, the gas in the first space can quickly enter the second space through the second exhaust channel to achieve rapid exhaust.

[0009] In some embodiments, the first direction is the length direction of the electrode assembly. Under normal circumstances, the outer peripheral wall of the electrode assembly is surrounded by two end faces in the length direction and two end faces in the width direction. The above four end faces are generally spaced apart from the second wall of the shell. However, when the electrode assembly is fully charged, the two end faces in the width direction of the electrode assembly are generally in contact with the inner wall of the shell. At this time, only the two end faces in the length direction of the electrode assembly are spaced apart from the inner wall of the shell. Therefore, the first direction adopts the length direction of the electrode assembly, which can make the support member located above the end face in the length direction of the electrode assembly, so that in the hot melt state, the gas in the first space can enter the second exhaust channel through a shorter path to achieve rapid exhaust.

[0010] In some embodiments, the support member includes: at least one bending portion, the bending portion includes at least two sheets connected in sequence and arranged at an angle. The support member adopts the structure provided by this embodiment, which is simple and stable.

[0011] In some embodiments, the bent portions are provided in plurality, and the plurality of bent portions are arranged in sequence along the third direction. With the structure provided in this embodiment, the second exhaust passages can be provided in plurality, so that the exhaust area of ​​the support member is larger, and it is convenient for the gas in the middle and late stages of thermal failure to quickly pass through the second exhaust passages to reach the pressure relief mechanism, so as to achieve rapid exhaust, which can improve the safety of the battery to a certain extent.

[0012] In some embodiments, the third direction is the width direction of the first wall. In this way, multiple bends can be arranged along the width direction of the first wall, so that the gas reaching the support member from the side where the main body of the electrode assembly is located in the middle and late stages of thermal failure can enter different second exhaust channels and reach the pressure relief mechanism through different second exhaust channels. In this way, compared with the arrangement in which some second exhaust channels have overlapping areas in the length direction of the first wall, rapid exhaust can be achieved, thereby further improving the safety of the battery.

[0013] In some embodiments, at least two of the bent portions are in contact or connected with each other. Compared with the solution in which any two bent portions are arranged at intervals, the solution provided by this embodiment can improve the mechanical strength of the support member to a certain extent, making the support member structure stable.

[0014] In some embodiments, two adjacent bent portions are spaced apart. By adopting the solution provided in this embodiment, a larger exhaust channel can be formed between two adjacent bent portions, so that the ventilation area of ​​the second exhaust channel is larger, which is convenient for rapid exhaust in the middle and late stages of thermal failure.

[0015] In some embodiments, the support member further comprises: a connecting portion connecting two adjacent and spaced-apart bending portions. By adopting the solution provided in this embodiment, the support strength and structural stability of the support member can be enhanced to a certain extent.

[0016] In some embodiments, the connecting portion is spaced apart from the first wall, a third exhaust channel is formed between the connecting portion and the first wall, and the third exhaust channel is connected to the second exhaust channel. Compared with only setting the second exhaust channel, the solution provided by this embodiment can increase the number of exhaust channels in the support member and increase the area of ​​the exhaust structure, which is convenient for rapid exhaust in the middle and late stages of thermal failure.

[0017] In some embodiments, the surface of the connecting portion facing the first wall is a plane, which facilitates the processing of the connecting portion and reduces the resistance of the gas in contact with the connecting portion when the gas enters the third exhaust channel, thereby allowing the gas to quickly pass through the third exhaust channel.

[0018] In some embodiments, at least two of the bending portions have different structures, so that the bending portions at different positions of the support member can adopt different structures according to usage requirements to meet the usage requirements at different positions.

[0019] In some embodiments, at least one of the bent portions is disposed in a cavity surrounded by another of the bent portions. By adopting the solution provided in this embodiment, the support strength of the support member in the direction perpendicular to the first wall can be improved to a certain extent, so that when the electrode assembly moves toward the first wall under air pressure in the middle and late stages of thermal runaway, pressure is applied to the support member. If the outermost bent portion is deformed by pressure, the inner bent portion can still remain in its original state without being subjected to pressure, so that part of the second exhaust channel remains unobstructed, so that the exhaust channel between the electrode assembly and the first wall is not easily completely closed, and thus the battery cell can be used with higher safety.

[0020] In some embodiments, the bending portion includes at least three sheets connected in sequence, and any two adjacent sheets are arranged at an angle. The bending portion in this embodiment can enclose a plurality of second exhaust channels, so that the exhaust area of ​​the support member is larger, and only two sheets are arranged relative to the bending portion, which can further improve the structural stability of the bending portion, reduce the risk of the bending portion being squeezed and deformed by the electrode assembly during use, and improve the safety of battery use.

[0021] In some embodiments, the support member further includes: a first support portion, located on a side of the bent portion close to the first wall and connected to the bent portion, the first support portion being used to contact the first wall surface. The provision of the first support portion can increase the contact area between the support member and the first wall, and can improve the support strength of the support member to a certain extent, reduce the risk of the support member being squeezed and deformed by the electrode assembly during use, and improve the safety of the battery cell.

[0022] In some embodiments, two bending portions are provided, and the two bending portions are provided at two ends of the first supporting portion in the length direction. The solution provided in this embodiment is adopted to facilitate the processing of the bending portion.

[0023] In some embodiments, the distance between the two bending portions is greater than or equal to 2 mm and less than or equal to the length of the first support portion. In this way, an opening can be formed between the two bending portions, so that the first support portion and the first wall can be welded through the opening during processing.

[0024] In some embodiments, the support member further includes: a second support portion, the second support portion is located on a side of the bent portion away from the first support portion, and is connected to the bent portion to enclose at least one second exhaust channel with the bent portion. The solution provided in this embodiment can further increase the support strength of the support member, reduce the risk of the support member being squeezed and deformed by the electrode assembly during use, and improve the safety of the battery cell.

[0025] In some embodiments, the bending portion has a first end and a second end facing the first support portion, the first end is connected to the first support portion, and the second end is spaced apart, in contact with, or connected to the first support portion. When the second end of the bending portion is spaced apart or in contact with the first support portion, the support member can be made by bending a sheet, which is easy to process. When the second end of the bending portion is connected to the first support portion, as shown in the figure, the structure of the support member is more stable.

[0026] In some embodiments, the first support portion includes at least one sheet. The solution provided in this embodiment makes the structure of the first support portion simple and easy to process.

[0027] In some embodiments, the first support portion and the bending portion are formed by bending a sheet, so that the support member is easy to process and the connection between the first support portion and the bending portion is stable.

[0028] In some embodiments, the bending portion has a first sheet and a second sheet connected to each other and arranged at an angle, and the height of the first sheet and the width of the second sheet satisfy the following relationship: A0 / B0=0.2-2; wherein B0 is the width of the second sheet, and A0 is the height of the first sheet. The solution provided in this embodiment makes the bending portion structure stable, and the triangular structure formed by the first sheet, the second sheet and the first support portion can be stable, with high support strength, and not easily deformed by the electrode assembly.

[0029] In some embodiments, the bending portion has a first sheet and a second sheet connected to each other and arranged at an angle, and the height of the first sheet and the width of the second sheet satisfy the following relationship: A0 / B0=0.5-1.3; wherein B0 is the width of the second sheet, and A0 is the height of the first sheet. The solution provided in this embodiment makes the bending portion structure stable, and the triangular structure formed by the first sheet, the second sheet and the first support portion can be stable, with high support strength, and not easily deformed by the electrode assembly.

[0030] In some embodiments, the width of the second sheet and the width of the first wall satisfy the following condition: B0 / L0=0.02-0.5; wherein L0 is the width of the first wall. The solution provided by this embodiment can make the support strength greater, require less material and occupy less space, and can meet the use requirements at the same time, achieving multiple goals at one stroke.

[0031] In some embodiments, the width of the bending portion is 0.5 mm to 100 mm. If the width of the bending portion is less than the above range, the width of the bending portion is too small, resulting in insufficient support strength. If the width of the bending portion is greater than the above range, the width of the bending portion is too large, resulting in too much space being occupied. Therefore, by adopting the range provided in this embodiment, the support strength of the bending portion can be greater and the space occupied can be smaller, achieving multiple goals at one stroke.

[0032] In some embodiments, the width of the bending portion is 1 mm to 50 mm. By adopting the range provided by this embodiment, the supporting strength of the bending portion can be greater and the space occupied can be smaller, achieving multiple goals at one stroke.

[0033] In some embodiments, the insulating member is provided with a receiving groove, and at least part of the supporting member is located in the receiving groove. The solution provided by this embodiment can make the volume of the assembly of the insulating member and the supporting member smaller, which is convenient for the miniaturization design of the battery cell.

[0034] In some embodiments, the entire support member is located in the receiving groove. Compared with a support member partially located in the receiving groove and another part located outside the receiving groove, the solution provided by this embodiment can further reduce the volume of the assembly of the insulating member and the support member, facilitating the miniaturization design of the battery cell.

[0035] In some embodiments, the insulating member has a boss protruding toward the electrode assembly, and the boss is provided with the receiving groove. The solution provided by this embodiment can reduce the thickness of the main body of the insulating member, which is convenient for the lightweight design of the battery cell.

[0036] In some embodiments, the width direction of the support member is parallel to the width direction of the boss, and the width of the support member and the width of the boss meet the following conditions: W1 / W0=0.15-0.87; wherein W1 is the width of the support member, and W0 is the width of the boss. The solution provided in this embodiment can make the support strength greater and require less material, while meeting the use requirements, achieving multiple goals at one stroke.

[0037] In some embodiments, the height direction of the support member is parallel to the height direction of the boss, and the height of the support member and the height of the boss meet the following conditions: A0 / H0=0.2-0.91; wherein A0 is the height of the support member, and H0 is the height of the boss. The solution provided in this embodiment makes the exhaust space of the second exhaust channel larger, which can meet the use needs in the middle and late stages of thermal runaway, and at the same time will not waste the height space of the electrode assembly, achieving multiple goals at one stroke.

[0038] In some embodiments, the height direction of the support member is parallel to the height direction of the boss, and the height of the support member and the height of the boss meet the following conditions: A0 / H0=0.35-0.83; wherein A0 is the height of the support member, and H0 is the height of the boss. The solution provided in this embodiment makes the exhaust space of the second exhaust channel larger, which can meet the use needs in the middle and late stages of thermal runaway, and at the same time will not waste the height space of the electrode assembly, achieving multiple goals at one stroke.

[0039] In some embodiments, the length direction of the support member is parallel to the width direction of the first wall, and the length of the support member and the width of the first wall satisfy the following condition: L1 / L0=0.1-0.8; wherein L1 is the length of the support member, and L0 is the width of the first wall. The solution provided in this embodiment makes the exhaust space of the second exhaust channel larger, which can meet the use needs in the middle and late stages of thermal runaway, maintain a better channel function, and at the same time will not cause material waste of the support member, achieving multiple goals at one stroke.

[0040] In some embodiments, the length direction of the support member is parallel to the width direction of the first wall, and the length of the support member and the width of the first wall satisfy the following condition: L1 / L0=0.2-0.6; wherein L1 is the length of the support member, and L0 is the width of the first wall. The solution provided in this embodiment makes the exhaust space of the second exhaust channel larger, which can meet the use needs in the middle and late stages of thermal runaway, maintain a better channel function, and at the same time will not cause material waste of the support member, achieving multiple goals at one stroke.

[0041] In some embodiments, the distance between the first center line of the projection figure of the support member on the first wall and the second center line of the projection figure of the pressure relief mechanism on the first wall is [0mm, 30mm], and the first center line and the second center line are both parallel to the length direction of the first wall.

[0042] The solution provided in this embodiment is adopted to facilitate the positioning of the support member, and can enable the gas passing through the second exhaust channel to reach the pressure relief mechanism as quickly as possible, thereby making the battery safer to use.

[0043] In some embodiments, the support member is connected to the first wall, so that after the insulating member is melted, the position of the support member does not change, so that it can still be supported between the first wall and the main body of the electrode assembly to ensure the exhaust effect of the second exhaust channel.

[0044] In some embodiments, the material of the support member is the same as that of the first wall. The solution provided by this embodiment is adopted to facilitate the welding operation between the support member and the first wall.

[0045] In some embodiments, the wall thickness of the support member is 0.4 mm to 2 mm. The structure provided in this embodiment can make the support member have a greater support strength and can meet general use requirements.

[0046] In some embodiments, the height of the support member is 1 mm to 20 mm. By adopting the solution provided in this embodiment, the height of the second exhaust channel can be made larger, thereby making the exhaust space of the second exhaust channel larger, so that the gas in the middle and late stages of thermal runaway can reach the pressure relief mechanism as soon as possible through the second exhaust channel, achieving rapid exhaust.

[0047] In some embodiments, the height of the support member is 2 mm to 10 mm. By adopting the solution provided in this embodiment, the height of the second exhaust channel can be made larger, thereby making the exhaust space of the second exhaust channel larger, so that the gas in the middle and late stages of thermal runaway can reach the pressure relief mechanism as soon as possible through the second exhaust channel, achieving rapid exhaust.

[0048] In some embodiments, the cross-sectional area of ​​at least one of the second exhaust channels is greater than or equal to 5 mm 2 By adopting the solution provided in this embodiment, the cross-sectional area of ​​the second exhaust channel is made larger, so that the gas can quickly pass through the second exhaust channel to reach the pressure relief mechanism.

[0049] In some embodiments, the melting point of the support member is greater than or equal to 350° C. The solution provided in this embodiment makes the melting point of the support member higher, so that it can maintain structural stability in the middle and late stages of thermal failure of the battery cell.

[0050] In some embodiments, the cross section of the second exhaust channel is a triangular structure, a trapezoidal structure or a groove structure. The solution provided in this embodiment makes the structure of the second exhaust channel stable and not easily deformed by extrusion.

[0051] In some embodiments, the support member is an integrally formed structure. The solution provided in this embodiment is adopted to make the structure of the support member stable.

[0052] In some embodiments, the support member is a metal member. The structure provided by this embodiment makes the support member stable, strong and has a high melting point.

[0053] In some embodiments, the support member is provided with two groups, and the two groups of the support members are respectively provided on both sides of the pressure relief mechanism, and the second exhaust channel extends toward the pressure relief mechanism. By adopting the solution provided in this embodiment, the gas on both sides of the electrode assembly can flow to the pressure relief mechanism through the corresponding support members, which can achieve rapid exhaust, reduce the risk of cracking on any side of the battery cell, and improve the safety of the battery cell.

[0054] In the second aspect, the embodiments of the present application provide a battery, including the battery cell provided by any of the above embodiments. The battery provided by the embodiments of the present application, including the battery cell provided by any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking of the side of the battery cell and improve the safety of the battery cell and the battery in use.

[0055] In a third aspect, an embodiment of the present application provides an electrical device, including a battery provided by any of the above embodiments. The electrical device provided by an embodiment of the present application, including a battery provided by any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking of the side of the battery cell, and improve the safety of the battery cell, the battery, and the electrical device.

[0056] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0058] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0059] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0060] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0061] Figure 4 for Figure 3 The schematic diagram of the main structure of the battery cell shown;

[0062] Figure 5 For battery cells Figure 4 Schematic diagram of the cross-sectional structure in the AA direction;

[0063] Figure 6 A schematic diagram of a partial cross-sectional structure of a battery cell according to some embodiments of the present application;

[0064] Figure 7 for Figure 3 Schematic diagram of the exploded structure of the insulating member and the supporting member;

[0065] Figure 8 A schematic diagram of the structure of a support member in a battery cell in some embodiments of the present application;

[0066] Fig. 9 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0067] Fig.10 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0068] Fig.11 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0069] Fig.12 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0070] Fig.13 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0071] Fig.14 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0072] Fig.15 for Figure 5 A schematic bottom view of the structure of the combined structure of the first wall and the supporting member;

[0073] Fig.16 The combined structure of the first wall and the support member in the battery cell is Fig.15 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0074] Fig.17 for Fig.16 Structural schematic diagram of the middle support member;

[0075] Fig.18 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0076] Fig.19 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0077] Fig. 20 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0078] Fig.21 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0079] Fig. 22 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0080] Fig.23 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0081] Fig.24 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0082] Fig.25 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0083] Fig.26 A schematic diagram of the structure of a support member in a battery cell in some other embodiments of the present application;

[0084] Fig. 27 It is a schematic partial cross-sectional structure diagram of a first wall, an insulating member and a supporting member in a battery cell according to some embodiments of the present application.

[0085] The reference numerals in the specific implementation manner are as follows:

[0086] 1000. Vehicles;

[0087] 100, battery; 200, controller; 300, motor;

[0088] 10. Box body; 11. First part; 12. Second part;

[0089] 20. Battery cell; 20', housing; 21. End cap; 21a. Electrode terminal; 22. Housing; 22a. First wall; 22b. Pressure relief mechanism; 22c. Second wall; 23. Electrode assembly; 23a. Tab; 23b. Main body; 23c. First end face; 24. Insulating member; 24a. First exhaust channel; 25. Support member; 25a. Second exhaust channel; 25b. Third exhaust channel; 26. Insulating sheet; 27. Adapter sheet; 28. Bottom support plate; 29. ​​Wrapping paper;

[0090] 241, receiving groove; 242, boss; 251, bending portion; 252, connecting portion; 253, first supporting portion; 254, second supporting portion;

[0091] 2511, first sheet; 2512, second sheet;

[0092] L, first center line; L', second center line; X, first direction; Y, second direction; Z, third direction; a, first space; b, second space. DETAILED DESCRIPTION

[0093] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0095] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0096] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0097] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0098] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0099] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0100] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0101] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0102] Research on battery thermal runaway is becoming increasingly important. Battery thermal runaway refers to a cumulative enhancement of current and battery temperature and gradual damage when the battery is charged at a constant voltage. This is mainly due to the fact that the heat generation inside the battery is much higher than the heat dissipation rate, and a large amount of heat is accumulated inside the battery, causing a chain reaction, leading to battery fire and explosion. There are both internal and external factors that cause battery thermal runaway. Among them, the internal factors are mainly: internal short circuit caused by defects in battery production; improper use of batteries, resulting in the generation of lithium dendrites inside, causing short circuits between the positive and negative electrodes, etc. The external factors are mainly: external factors such as extrusion and puncture causing battery short circuits; external short circuits of batteries causing excessive accumulation of heat inside the battery, etc.

[0103] In order to reduce the risk of explosion in the state of thermal runaway of the battery, an explosion-proof valve is generally provided on the battery. In addition, an insulating component is generally provided between the electrode assembly of the battery and the explosion-proof valve. The insulating component is provided with an exhaust channel so that the gas on the electrode assembly side can quickly pass through the exhaust channel to the location of the explosion-proof valve in the state of thermal runaway, and exhaust is achieved through the explosion-proof valve, so that the pressure can be released in time during the thermal runaway process of the battery.

[0104] However, the current insulating components have a low melting point and are easily melted in a thermal runaway state. At the same time, the electrode assembly is easily moved toward the side of the explosion-proof valve under the impact of the high-pressure airflow in the battery casing, thereby abutting against the side wall of the battery cell equipped with the explosion-proof valve, closing the exhaust channel between the electrode assembly and the explosion-proof valve, and preventing the gas in the side cavity from quickly flowing to the bottom of the explosion-proof valve for exhaust, causing the side weld of the battery cell to burst, and high-temperature metal particles to spray to adjacent battery cells, causing heat spread.

[0105] In order to improve the above problems, an embodiment of the present application provides a battery cell, in which a first exhaust channel is provided in an insulating member, a support member having a higher melting point than the insulating member is added to the battery cell, and a second exhaust channel is provided in the support member. In this way, the structural reliability of the support member can be higher than that of the insulating member, and the battery cell can be exhausted to the location of the pressure relief mechanism through the first exhaust channel in the early stage of thermal runaway. After the first exhaust channel is melted in the late stage of thermal runaway, exhaust can be achieved with the help of the second exhaust channel, so that the battery cell provided in this embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell.

[0106] In addition, the insulating component has at least two planes that are interconnected and set at an angle, and at least two planes are arranged to form a second exhaust channel. In this way, at least two planes in the insulating component can form a structure with a triangular cross-section similar to a triangular pyramid, a triangular prism, etc. with the first wall or the third plane, which is not easily squeezed and collapsed by the electrode assembly in the middle and late stages of thermal failure. The exhaust space of the second exhaust channel can be less likely to be compressed, so that the gas on the side where the main body of the electrode assembly is located can quickly reach the location of the pressure relief mechanism through the second exhaust channel, thereby achieving rapid pressure relief, which can improve the safety of battery cell use to a certain extent.

[0107] The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0108] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0109] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0110] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0111] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc. In some cases, the battery cells can also be directly installed in the vehicle without a box or shell, that is, there is no need to form a battery pack, and the structure of the vehicle body itself serves as a fixing structure for the battery cells.

[0112] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0113] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0114] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3The battery cell 20 includes a shell 20', an electrode assembly 23 and other functional components. Among them, the shell 20' is a closed structure, which can form the internal environment of the battery cell 20, and generally includes an end cap 21 and a shell 22. The shell 22 and the end cap 21 can be two independent components. An opening can be set on the shell 22, and the shell 20' is formed by covering the opening with the end cap 21 at the opening. Without limitation, the shell 20' can also be an integrated structure, that is, the end cap 21 and the shell 22 are integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the interior of the shell 22, the end cap 21 is covered with the shell 22.

[0115] Among them, the end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0116] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0117] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body 23b of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body 23b or respectively at both ends of the main body 23b. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0118] like Figures 3 to 8 As shown, the embodiment of the present application provides a battery cell 20 , which includes a housing 20 ′, an electrode assembly 23 , an insulating member 24 and a supporting member 25 .

[0119] The housing 20' has a first wall 22a, a second wall 22c and a pressure relief mechanism 22b, wherein the pressure relief mechanism 22b is disposed on the first wall 22a. The first wall 22a and the second wall 22c are disposed to intersect. The electrode assembly 23 is disposed in the housing 20'. A first space a is formed between the outer peripheral wall of the electrode assembly 23 and the second wall 22c.

[0120] The insulating member 24 is disposed in the housing 20' and is located between the first wall 22a and the electrode assembly 23. A second space b is formed between the insulating member 24 and the pressure relief mechanism 22b. A first exhaust channel 24a is provided on the insulating member 24. The first exhaust channel 24a communicates with the first space a and the second space b. The supporting member 25 is disposed in the housing 20' and is located between the first wall 22a and the insulating member 24. A second exhaust channel 25a is provided on the supporting member 25. The second exhaust channel 25a is used to communicate the first space a and the second space b.

[0121] The melting point of the supporting member 25 is greater than the melting point of the insulating member 24. The insulating member 24 has at least two planes connected to each other and arranged at an angle, and the at least two planes surround and form a second exhaust channel 25a.

[0122] As mentioned above, the outer shell 20' is a closed structure, which is used to form the internal environment of the battery cell 20, and generally includes an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent components, or an integrated structure, which will not be repeated here. Among them, the shell 22 generally has multiple side walls and a bottom wall, and the end cover 21 is generally a single plate or a composite plate with a certain thickness. The first wall 22a can be a side wall in the shell 22 or the bottom wall of the shell 22, or it can be an end cover 21, which can be set according to the needs of use. The second wall 22c is one or more side walls connected to the first wall 22a.

[0123] The pressure relief mechanism 22b may be an explosion-proof valve, or other mechanisms that can achieve pressure relief. For example, a notch is set on the shell 20'. When the air pressure in the shell 20' is high, the gas can break through the notch to achieve pressure relief. At this time, the notch and the area surrounded by the notch are the pressure relief mechanism 22b.

[0124] The first exhaust channel 24a can be a hole, a microporous structure, an opening, etc. opened on the insulating member 24, and can be determined according to the use requirements. Through the first exhaust channel 24a, the gas located on the side where the main body 23b of the electrode assembly 23 is located (i.e., in the first space a) can flow to the space between the insulating member 24 and the first wall 22a (i.e., the second space b). Among them, the main body 23b of the electrode assembly 23 is the part of the electrode assembly 23 where the positive electrode sheet has an active material layer and the negative electrode sheet has an active material layer, and is also the part of the electrode assembly 23 except the tab 23a.

[0125] The support member 25 can be used to support between the main body 23b of the electrode assembly 23 and the first wall 22a after at least part of the insulating member 24 is heat-melted, so that the gas on the side of the main body 23b of the electrode assembly 23 (i.e., the gas in the first space a) can flow to the location of the pressure relief mechanism 22b (i.e., the second space b) through the second exhaust channel 25a on the support member 25. Exemplarily, the support member 25 can be made of a material having a melting point higher than that of the insulating member 24, such as metal or ceramic. The second exhaust channel 25a can be a hole, a microporous structure, an opening, etc., which can be determined according to the needs of use. The second exhaust channel 25a is used to connect the first space a and the second space b, which means that in the initial state, that is, before the insulating member 24 is heat-melted, the second exhaust channel 25a can be blocked or exposed, as long as it can connect the first space a and the second space b after the insulating member 24 is heat-melted.

[0126] The melting point is the temperature at which a solid changes its physical state from solid to liquid. The melting point of the support member 25 is the temperature at which the physical state of the support member 25 changes from solid to liquid, and the melting point of the insulating member 24 is the temperature at which the physical state of the insulating member 24 changes from solid to liquid.

[0127] The insulating member 24 has at least two planes connected to each other and arranged at an angle, which means that the at least two planes can enclose a structure with a triangular cross section similar to a triangular pyramid or a triangular prism with the first wall 22a or the third plane, and the enclosed structure is the second exhaust channel 25a. The at least two planes enclosing the second exhaust channel 25a include at least the following two situations: the first situation is that there are three planes, and the three planes enclose a structure with a triangular cross section similar to a triangular pyramid or a triangular prism; the second situation is that there are two planes, and the two planes enclose a structure with a triangular cross section similar to a triangular pyramid or a triangular prism with the first wall 22a.

[0128] The exhaust method of the battery cell 20 provided in the embodiment of the present application in the thermal runaway state is as follows:

[0129] In the initial state, the second exhaust channel 25 a on the supporting member 25 may be exposed outside the insulating member 24 or may be blocked by the insulating member 24 .

[0130] In the early stage of thermal runaway, the insulating component 24 has not melted and the first exhaust channel 24a still exists. At this time, the gas on the side where the main body 23b of the electrode assembly 23 is located (that is, the gas in the first space a) can enter the second space b through the first exhaust channel 24a and reach the position of the pressure relief mechanism 22b, and exhaust is achieved through the pressure relief mechanism 22b.

[0131] In the middle and late stages of thermal runaway, when the temperature inside the housing 20' is greater than the melting point of the insulating member 24 but less than the melting point of the supporting member 25, the insulating member 24 melts, the first exhaust channel 24a disappears, and the second exhaust channel 25a is exposed. The supporting member 25 is supported between the electrode assembly 23 and the first wall 22a. The gas on the side where the main body 23b of the electrode assembly 23 is located (i.e., the gas in the first space a) can enter the second space b through the second exhaust channel 25a and reach the position of the pressure relief mechanism 22b, and exhaust is achieved through the pressure relief mechanism 22b.

[0132] The battery cell 20 provided in the embodiment of the present application has a first exhaust channel 24a disposed in the insulating member 24, a support member 25 having a higher melting point than the insulating member 24 is added to the battery cell 20, and a second exhaust channel 25a is disposed in the support member 25. In this way, the structural reliability of the support member 25 can be higher than the structural reliability of the insulating member 24, and the battery cell 20 can be exhausted to the location of the pressure relief mechanism 22b through the first exhaust channel 24a at the beginning of thermal runaway, and the second exhaust channel 25a can be used to exhaust after the first exhaust channel 24a is melted in the later stage of thermal runaway, so that the battery cell 20 provided in the present embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism 22b at various stages of thermal failure, so as to reduce the risk of cracking of the side of the battery cell 20 and improve the safety of the use of the battery cell 20.

[0133] In addition, the insulating component 24 has at least two planes that are interconnected and set at an angle, and at least two planes are arranged to form a second exhaust channel 25a. In this way, at least two planes in the insulating component 24 can form a structure with a triangular cross-section similar to a triangular pyramid, a triangular prism, etc. with the first wall 22a or the third plane, which is not easily squeezed and collapsed by the electrode assembly 23 in the middle and late stages of thermal failure. The exhaust space of the second exhaust channel 25a can be less compressed, so that the gas on the side of the main body 23b of the electrode assembly 23 can quickly reach the position of the pressure relief mechanism 22b through the second exhaust channel 25a, thereby achieving rapid pressure relief, which can improve the safety of the battery cell 20 to a certain extent.

[0134] like Figure 3 As shown, in some embodiments, the first end surface 23c of the electrode assembly 23 is spaced apart from the second wall 22c in the first direction X, and at least a portion of the first space a is formed therebetween. The position of the support member 25 corresponds to the position of the first end surface 23c.

[0135] The first direction X may be a length direction of the electrode assembly 23 or a width direction of the electrode assembly 23 .

[0136] At least part of the first space a is formed between the two, including the following situations: first, the first space a is formed only between the end face of the electrode assembly 23 in the first direction X and the second wall 22c. At this time, the first end face 23c of the electrode assembly 23 in the first direction X and the second wall 22c form the entire second space; second, the first space a includes not only the space formed between the first end face 23c of the electrode assembly 23 in the first direction X and the second wall 22c, but also other spaces, such as the space formed between the other end faces of the electrode assembly 23 and the second wall 22c. At this time, the first end face 23c of the electrode assembly 23 in the first direction X and the second wall 22c form a part of the second space.

[0137] The position of the support member 25 corresponds to the position of the first end surface 23c, which means that the support member 25 is located above the first end surface 23c of the electrode assembly 23, which can be directly above or obliquely above, depending on the specific usage requirements.

[0138] By adopting the solution provided in this embodiment, the support member 25 can be located above at least a portion of the first space a, so that the gas in the first space a can quickly pass through the support member 25 into the second space under hot melting conditions, thereby achieving rapid exhaust.

[0139] like Figure 6 and Figure 7 As shown, in some embodiments, the support member 25 is spaced apart from the second wall 22c. The second exhaust channel 25a penetrates the support member 25 along the second direction Y. The second direction Y is parallel to the first direction X or is arranged at an angle to the first direction X.

[0140] The support member 25 and the second wall 22c are spaced apart, which means that they are not in contact with each other. After the insulating member 24 is at least partially melted, the first space a can be connected to the second exhaust channel 25a through the gap between the support member 25 and the second wall 22c, thereby achieving communication with the second space. The second direction Y can be a straight line direction or a curved line direction.

[0141] The second direction Y is parallel to the first direction X or is arranged at an angle to the first direction X, so that the gas in the first space a can quickly enter the second space through the second exhaust channel 25a after the insulating component 24 is thermally melted, thereby achieving rapid exhaust.

[0142] like Figure 3 As shown, in some embodiments, the first direction X is the length direction of the electrode assembly 23 .

[0143] Because under normal circumstances, the outer peripheral wall of the electrode assembly 23 is formed by connecting two end faces in the length direction and two end faces in the width direction end to end. The above four end faces are generally spaced apart from the second wall 22c of the shell 22. However, when the electrode assembly 23 is fully charged, the two end faces in the width direction of the electrode assembly 23 are generally in contact with the inner wall of the shell 22. At this time, only the two end faces in the length direction of the electrode assembly 23 are spaced apart from the inner wall of the shell 22. Therefore, the first direction X adopts the length direction of the electrode assembly 23, which can make the support member 25 located above the end face in the length direction of the electrode assembly 23, so that in the hot melt state, the gas in the first space a can enter the second exhaust channel 25a through a shorter path to achieve rapid exhaust.

[0144] like Figures 8 to 10As shown, in some embodiments, the support member 25 includes at least one bending portion 251. The bending portion 251 includes at least two sheets connected in sequence and arranged at an angle.

[0145] The sheet body means that the size of the component in at least one direction is much larger than its size in the thickness direction. It is understood that the at least one direction is a direction other than the thickness direction, such as the length direction, the width direction, etc. Much larger means that the size in the other direction is at least 4 times larger than the size in the thickness direction.

[0146] The supporting member 25 adopts the structure provided in this embodiment, which is simple and stable.

[0147] like Fig.11 and Fig.12 As shown, in some embodiments, a plurality of bending portions 251 are provided, and the plurality of bending portions 251 are arranged in sequence along the third direction Z.

[0148] The third direction Z can be the length direction, width direction or other direction of the first wall 22a, which can be determined according to the use requirements. The sequential arrangement can be sequentially connected, or sequentially spaced, or one part of the bending portions 251 is sequentially connected, and the other part is sequentially spaced.

[0149] By adopting the structure provided in this embodiment, it is possible to have multiple second exhaust channels 25a, so that the exhaust area of ​​the support member 25 is larger, which makes it easier for the gas in the middle and late stages of thermal failure to quickly pass through the second exhaust channels 25a to reach the pressure relief mechanism 22b, so as to achieve rapid exhaust, which can improve the safety of the battery 100 to a certain extent.

[0150] In some embodiments, the third direction Z is the width direction of the first wall 22a. In this way, the plurality of bent portions 251 can be arranged along the width direction of the first wall 22a, so that the gas reaching the support member 25 from the side where the main body 23b of the electrode assembly 23 is located in the middle and late stages of thermal failure can enter different second exhaust channels 25a and reach the pressure relief mechanism 22b through different second exhaust channels 25a. In this way, compared with the arrangement in which some second exhaust channels 25a have overlapping areas in the length direction of the first wall 22a, rapid exhaust can be achieved, thereby further improving the safety of the battery 100.

[0151] like Fig.11As shown, in some embodiments, at least two bending portions 251 are in contact or connected with each other. At least two bending portions 251 are in contact or connected with each other, including but not limited to the following situations: First, there are portions in contact with each other between the outer walls of at least two bending portions 251, but there is no connection relationship between the outer walls of different bending portions 251; Second, there are portions in contact and connected with each other between the outer walls of at least two bending portions 251. The scheme provided by this embodiment can improve the mechanical strength of the support member 25 to a certain extent compared with the scheme in which any two bending portions 251 are arranged at intervals, so that the structure of the support member 25 is stable.

[0152] like Fig.12 As shown, in some embodiments, two adjacent bending portions 251 are arranged at intervals.

[0153] The interval arrangement means that there is a gap between two adjacent bending portions 251 .

[0154] By adopting the solution provided in this embodiment, a larger exhaust channel can be formed between two adjacent bent portions 251, so that the ventilation area of ​​the second exhaust channel 25a is larger, which is convenient for rapid exhaust in the middle and late stages of thermal failure.

[0155] like Fig.12 As shown, in some embodiments, the supporting member 25 further includes a connecting portion 252. The connecting portion 252 connects two adjacent bending portions 251 that are spaced apart.

[0156] The connecting portion 252 is used to connect two adjacent and spaced-apart bending portions 251, and can be composed of one component or multiple components. The above components can be plate-shaped structures, columnar structures, etc., which can be determined according to the use requirements.

[0157] By adopting the solution provided in this embodiment, the supporting strength and structural stability of the supporting member 25 can be enhanced to a certain extent.

[0158] like Fig.12 As shown, in some embodiments, the connection portion 252 is spaced apart from the first wall 22a. A third exhaust passage 25b is formed between the connection portion 252 and the first wall 22a. The third exhaust passage 25b is in communication with the second exhaust passage 25a.

[0159] The third exhaust passage 25b is a passage connecting at least two oppositely disposed side surfaces of the support member 25. The structure of the third exhaust passage 25b may be the same as or different from that of the second exhaust passage 25a.

[0160] Compared with only providing the second exhaust channel 25a, the solution provided in this embodiment can increase the number of exhaust channels in the support member 25 and increase the area of ​​the exhaust structure, thereby facilitating rapid exhaust in the middle and late stages of thermal failure.

[0161] like Fig.12 As shown, in some embodiments, the surface of the connecting portion 252 facing the first wall 22a is a plane, that is, the surface of the connecting portion 252 in contact with the third exhaust channel 25b is a plane. This facilitates the processing of the connecting portion 252, and at the same time, the resistance of the gas in contact with the connecting portion 252 when entering the third exhaust channel 25b is small, so that the gas can quickly pass through the third exhaust channel 25b.

[0162] like Fig.13 As shown, in some embodiments, the structures of at least two bending portions 251 are different.

[0163] In this way, the bending portions 251 at different positions of the supporting member 25 can adopt different structures according to usage requirements to meet the usage requirements at different positions.

[0164] like Fig.14 As shown, in some embodiments, at least one bending portion 251 is disposed in a cavity surrounded by another bending portion 251 .

[0165] The cavity surrounded by the other bent portion 251 may be a cavity with only two ends open, or a cavity with three or more sides open.

[0166] By adopting the solution provided in this embodiment, the support strength of the support member 25 in the direction perpendicular to the first wall 22a can be improved to a certain extent, so that when the electrode assembly 23 moves toward the first wall 22a under air pressure in the middle and late stages of thermal runaway, pressure is applied to the support member 25. If the outermost bent portion 251 is deformed by compression, the inner bent portion 251 can still remain in its original shape without being subjected to pressure, so that part of the second exhaust channel 25a still remains unobstructed, making it difficult for the exhaust channel between the electrode assembly 23 and the first wall 22a to be completely closed, thereby making the battery cell 20 safer to use.

[0167] like Figures 9 to 12 As shown, in some embodiments, the bending portion 251 includes at least three sheets connected in sequence, and any two adjacent sheets are arranged at an angle.

[0168] The bending portion 251 in this embodiment can enclose a plurality of second exhaust channels 25a, so that the exhaust area of ​​the support member 25 is larger, and only two sheets are provided relative to the bending portion 251, which can further improve the structural stability of the bending portion 251, reduce the risk of the bending portion 251 being squeezed and deformed by the electrode assembly 23 during use, and improve the safety of the battery 100.

[0169] like Figures 15 to 24As shown, in some embodiments, the support member 25 further includes a first support portion 253. The first support portion 253 is located on a side of the bending portion 251 close to the first wall 22a and connected to the bending portion 251. The first support portion 253 is used to contact the first wall 22a.

[0170] The first support portion 253 is a part of the support member 25, and is used to contact the first wall 22a. The first support portion 253 can be composed of one component, such as a sheet, a plate, etc., or can be composed of multiple components, such as two spaced sheets, plates, etc. The first support portion 253 in this embodiment can be connected with the bending portion 251 to form at least one hollow triangular prism structure or a triangular prism-like structure.

[0171] The provision of the first support portion 253 can increase the contact area between the support member 25 and the first wall 22a, and can improve the support strength of the support member 25 to a certain extent, reduce the risk of the support member 25 being squeezed and deformed by the electrode assembly 23 during use, and improve the safety of the battery cell 20.

[0172] like Fig.17 As shown, in some embodiments, two bending portions 251 are provided, and the two bending portions 251 are respectively provided at two ends of the first supporting portion 253 in the length direction.

[0173] As mentioned above, the first support portion 253 is generally a sheet, plate or other structure, and generally has a length direction and a width direction.

[0174] The solution provided in this embodiment is adopted to facilitate the processing of the bending portion 251 .

[0175] like Fig.17 As shown, in some embodiments, the distance L2 between the two bending portions 251 is greater than or equal to 2 mm, and less than or equal to the length L1 of the first supporting portion 253 .

[0176] In this way, an opening may be formed between the two bent portions 251 , so that the first supporting portion 253 and the first wall 22 a can be welded through the opening during processing.

[0177] like Fig.25 and Fig.26 As shown, in some embodiments, the support member 25 further includes a second support portion 254. The second support portion 254 is located on a side of the bending portion 251 away from the first support portion 253 and is connected to the bending portion 251 to enclose at least one second exhaust channel 25a.

[0178] The second support portion 254 is also a part of the support member 25, and may be composed of one component, such as a sheet, a plate, etc., or may be composed of multiple components, such as two spaced sheets, plates, etc. The second support portion 254 in this embodiment may be connected to a side of the bending portion 251 away from the first support portion 253 to form at least one second exhaust channel 25a, and the cross section of the second exhaust channel 25a may be a triangular structure, or a similar triangular structure.

[0179] By adopting the solution provided in this embodiment, the support strength of the support member 25 can be further increased, the risk of the support member 25 being squeezed and deformed by the electrode assembly 23 during use can be reduced, and the safety of the battery cell 20 can be improved.

[0180] like Fig.19 and Fig. 20 As shown, in some embodiments, the bending portion 251 has a first end and a second end facing the first support portion 253. The first end is connected to the first support portion 253, and the second end is spaced apart, in contact with, or connected to the first support portion 253.

[0181] The interval setting means that there is a certain interval between the second end of the bending portion 251 and the first supporting portion 253, such as Fig. 20 Contact means that there is at least one region where the second end of the bending portion 251 and the first supporting portion 253 are in contact with each other.

[0182] When the second end of the bending portion 251 is spaced apart from or in contact with the first supporting portion 253, the supporting member 25 can be made by bending a sheet, which is easy to process. Fig.19 As shown, the structure of the supporting member 25 is more stable.

[0183] In some embodiments, the first support portion 253 includes at least one sheet. In this embodiment, the first support portion 253 may include only one sheet, or may include other structures besides one sheet, such as multiple sheets, or a sheet with reinforcing ribs.

[0184] By adopting the solution provided in this embodiment, the structure of the first support portion 253 is simple and easy to process.

[0185] In some embodiments, the first supporting portion 253 and the bending portion 251 are formed by bending a sheet.

[0186] In this way, the support member 25 is easy to process and the connection between the first support portion 253 and the bending portion 251 is stable.

[0187] like Fig.17As shown, in some embodiments, the bending portion 251 has a first sheet 2511 and a second sheet 2512 connected to each other and arranged at an angle. The height of the first sheet 2511 and the width of the second sheet 2512 satisfy the following relationship:

[0188] A0 / B0=0.2~2;

[0189] Wherein, B0 is the width of the second sheet 2512 , and A0 is the height of the first sheet 2511 .

[0190] The height of the first sheet 2511 refers to the dimension of the first sheet 2511 in the normal direction of the first wall 22a facing the support member 25. The width of the second sheet 2512 refers to the dimension of the second sheet 2512 in its width direction. The width direction is also a direction perpendicular to the thickness direction and perpendicular to the extension direction of the second exhaust passage 25a.

[0191] By adopting the solution provided in this embodiment, the bending portion 251 has a stable structure, and the triangular structure formed by the first sheet 2511, the second sheet 2512 and the first supporting portion 253 can be stable, with high supporting strength and not easily squeezed and deformed by the electrode assembly 23.

[0192] In some embodiments, the bending portion 251 has a first sheet 2511 and a second sheet 2512 connected to each other and arranged at an angle, and the height of the first sheet 2511 and the width of the second sheet 2512 satisfy the following relationship:

[0193] A0 / B0=0.5-1.3;

[0194] Wherein, B0 is the width of the second sheet 2512 , and A0 is the height of the first sheet 2511 .

[0195] By adopting the solution provided in this embodiment, the bending portion 251 has a stable structure, a strong supporting strength, and is not easily squeezed and deformed by the electrode assembly 23 .

[0196] like Fig.17 As shown, in some embodiments, the width of the support member 25 and the width of the first wall 22a satisfy the following conditions:

[0197] B0 / L0=0.02~0.5;

[0198] Here, B0 is the width of the supporting member 25, and L0 is the width of the first wall 22a.

[0199] If the ratio of B0 / L0 is less than the above range, the size of the support member 25 is small, the support strength is small, and it is easy to be squeezed and deformed by the electrode assembly 23 during use, resulting in the blocking of the second exhaust channel 25a; if the ratio of B0 / L0 is greater than the above range, the size of the support member 25 will be large, more materials will be required, resulting in waste, and the support member 25 will occupy a large space. Therefore, the solution provided in this embodiment can make the support strength larger, the required materials are less and the space occupied is smaller, and it can meet the use needs at the same time, achieving multiple goals at one stroke.

[0200] In some embodiments, the width of the bending portion 251 is 0.5 mm to 100 mm.

[0201] The width of the bent portion 251 refers to the dimension of the bent portion 251 in its width direction. The width direction is also a direction perpendicular to the normal direction of the first wall 22a toward the support member 25 and perpendicular to the extending direction of the second exhaust passage 25a.

[0202] If the width of the bending portion 251 is smaller than the above range, the width of the bending portion 251 is too small, resulting in insufficient support strength. If the width of the bending portion 251 is larger than the above range, the width of the bending portion 251 is too large, resulting in too much space being occupied. Therefore, by adopting the range provided in this embodiment, the support strength of the bending portion 251 can be greater and the space occupied can be smaller, achieving multiple goals at one stroke.

[0203] In some embodiments, the width of the bending portion 251 is 1 mm to 50 mm.

[0204] By adopting the range provided in this embodiment, the support strength of the bending portion 251 can be greater and the space occupied can be smaller, thereby achieving multiple goals at one stroke.

[0205] like Fig. 27 As shown, in some embodiments, the insulating member 24 is provided with a receiving groove 241 , and at least a portion of the supporting member 25 is located in the receiving groove 241 .

[0206] The receiving groove 241 is a groove body for receiving at least part of the support member 25, and can be directly prepared when preparing the insulating member 24, or can be prepared by cutting, stamping, etc. after the insulating member 24 is formed. The size of the receiving groove 241 can be prepared according to the size of the support member 25 and its use requirements.

[0207] By adopting the solution provided in this embodiment, the volume of the assembly of the insulating member 24 and the supporting member 25 can be reduced, which facilitates the miniaturization design of the battery cell 20 .

[0208] In some embodiments, the entirety of the support member 25 is located within the receiving groove 241 .

[0209] Compared with a part of the support member 25 being located in the receiving groove 241 and the other part being located outside the receiving groove 241 , the solution provided in this embodiment can further reduce the volume of the assembly of the insulating member 24 and the support member 25 , facilitating the miniaturization design of the battery cell 20 .

[0210] In some embodiments, the insulating member 24 has a boss 242 protruding toward the electrode assembly 23 , and each boss 242 is provided with a receiving groove 241 .

[0211] The boss 242 is generally a block protruding from the side of the insulating member 24 facing the electrode assembly 23, and one or more bosses 242 may be provided. The boss 242 may be integrally formed with the main body of the insulating member 24, or may be installed on the main body of the insulating member 24 by plugging, snapping, etc. The main body of the insulating member 24 refers to the portion of the insulating member 24 excluding the boss 242.

[0212] Since the accommodating groove 241 can accommodate the entire support member 25, and a second exhaust channel 25a is provided on the support member 25, the size of the support member 25 in the normal direction of the first wall 22a facing the side of the support member 25 is generally larger than the thickness of the main body of the insulating member 24. The solution provided in this embodiment can make the thickness of the main body of the insulating member 24 smaller, which is convenient for the lightweight design of the battery cell 20.

[0213] like Fig. 27 As shown, in some embodiments, the width direction of the support member 25 is parallel to the width direction of the boss 242, and the width of the support member 25 and the width of the boss 242 meet the following conditions:

[0214] W1 / W0=0.15-0.87;

[0215] Wherein, W1 is the width of the supporting member 25 , and W0 is the width of the boss 242 .

[0216] If the ratio of W1 / W0 is less than the above range, the size of the support member 25 is small, the support strength is small, and it is easy to be squeezed and deformed by the electrode assembly 23 during use, resulting in the blocking of the second exhaust channel 25a; if the ratio of W1 / W0 is greater than the above range, the size of the support member 25 will be large, and more materials will be required, resulting in waste. Therefore, the solution provided in this embodiment can make the support strength of the support member 25 larger and the required material less, while meeting the use needs, achieving multiple goals at one stroke.

[0217] In some embodiments, the height direction of the support member 25 is parallel to the height direction of the boss 242, and the height of the support member 25 and the height of the boss 242 satisfy the following conditions:

[0218] A0 / H0=0.2~0.91;

[0219] Wherein, A0 is the height of the supporting member 25 , and H0 is the height of the boss 242 .

[0220] The height direction of the support member 25 is parallel to the height direction of the boss 242 , and both directions are parallel to the normal direction of the first wall 22 a toward the support member 25 .

[0221] If the ratio of A0 / H0 is less than the above range, the size of the support member 25 is small, and the exhaust space of the second exhaust channel 25a is small, which is not conducive to the discharge of gas in the middle and late stages of thermal runaway; if the ratio of A0 / H0 is greater than the above range, the size of the support member 25 is large, and the size of the boss 242 is large, which will occupy more space in the housing 20', resulting in waste of the height space of the electrode assembly 23. Therefore, the solution provided in this embodiment is adopted, so that the exhaust space of the second exhaust channel 25a is large, which can meet the use needs in the middle and late stages of thermal runaway, and at the same time, the height space of the electrode assembly 23 will not be wasted, achieving multiple goals at one stroke.

[0222] In some embodiments, the height direction of the support member 25 is parallel to the height direction of the boss 242, and the height of the support member 25 and the height of the boss 242 satisfy the following conditions:

[0223] A0 / H0=0.35~0.83;

[0224] Wherein, A0 is the height of the supporting member 25 , and H0 is the height of the boss 242 .

[0225] By adopting the solution provided in this embodiment, the exhaust space of the second exhaust channel 25a is larger, which can meet the use needs in the middle and late stages of thermal runaway, and at the same time will not waste the height space of the electrode assembly 23, thus achieving multiple goals at one stroke.

[0226] like Fig.16 As shown, in some embodiments, the length direction of the support member 25 is parallel to the width direction of the first wall 22a. The length of the support member 25 and the width of the first wall 22a satisfy the following conditions:

[0227] L1 / L0=0.1~0.8;

[0228] Wherein, L1 is the length of the supporting member 25, and L0 is the width of the first wall 22a.

[0229] If the ratio of L1 / L0 is less than the above range, the size of the support member 25 is small, and the exhaust space of the second exhaust channel 25a is small, which is not conducive to the discharge of gas in the middle and late stages of thermal runaway; if the ratio of L1 / L0 is greater than the above range, the size of the support member 25 is large, and more materials are required to make it, which will cause material waste of the support member 25. Therefore, the solution provided in this embodiment is adopted to make the exhaust space of the second exhaust channel 25a larger, which can meet the use needs in the middle and late stages of thermal runaway, maintain a better channel function, and at the same time will not cause material waste of the support member 25, achieving multiple goals at one stroke.

[0230] In some embodiments, the length direction of the support member 25 is parallel to the width direction of the first wall 22a, and the length of the support member 25 and the width of the first wall 22a satisfy the following conditions:

[0231] L1 / L0=0.2~0.6;

[0232] Wherein, L1 is the length of the supporting member 25, and L0 is the width of the first wall 22a.

[0233] By adopting the solution provided in this embodiment, the exhaust space of the second exhaust channel 25a is larger, which can meet the use needs in the middle and late stages of thermal runaway and maintain a better channel function, while not causing material waste of the support member 25, thus achieving multiple goals at one stroke.

[0234] like Fig.15 As shown, in some embodiments, the spacing between the first center line L of the projection pattern of the support member 25 on the first wall 22a and the second center line L' of the projection pattern of the pressure relief mechanism 22b on the first wall 22a is [0mm, 30mm]. The first center line L and the second center line L' are both parallel to the length direction of the first wall 22a.

[0235] The first center line L is the center line of the projection pattern of the support member 25 on the first wall 22a parallel to the length direction of the first wall 22a. The second center line L' is the center line of the projection pattern of the pressure relief mechanism 22b on the first wall 22a parallel to the length direction of the first wall 22a.

[0236] The distance between the first center line L of the projection figure of the support member 25 on the first wall 22a and the second center line L' of the projection figure of the pressure relief mechanism 22b on the first wall 22a is [0mm, 30mm], which means that the distance between the first center line L and the second center line L' is greater than or equal to 0mm and less than or equal to 30mm.

[0237] The solution provided in this embodiment is adopted to facilitate the positioning of the support member 25 and enable the gas passing through the second exhaust channel 25a to reach the pressure relief mechanism 22b as quickly as possible, so that the battery 100 is safer to use.

[0238] In some embodiments, the support member 25 is connected to the first wall 22a.

[0239] The support member 25 and the first wall 22a can be connected by welding, integral molding, or the like.

[0240] In this way, after the insulating member 24 is melted, the position of the supporting member 25 will not change, so that it can still be supported between the first wall 22a and the main body 23b of the electrode assembly 23 to ensure the exhaust effect of the second exhaust channel 25a.

[0241] In some embodiments, the material of the support member 25 is the same as the material of the first wall 22a.

[0242] In general, the support member 25 is connected to the first wall 22a by welding. The solution provided in this embodiment is adopted to facilitate the welding operation between the support member 25 and the first wall 22a.

[0243] like Fig.17 As shown, in some embodiments, the wall thickness T0 of the support member 25 is 0.4 mm to 2 mm.

[0244] Since the support member 25 can be formed by bending a single sheet or by combining a plurality of sheets, the wall thickness of the support member 25 refers to the thickness of the sheet.

[0245] By adopting the structure provided in this embodiment, the support member 25 can have a greater supporting strength and can meet general usage requirements.

[0246] In some embodiments, the height A0 of the support member 25 is 1 mm to 20 mm.

[0247] By adopting the solution provided in this embodiment, the height of the second exhaust channel 25a can be made larger, and thus the exhaust space of the second exhaust channel 25a can be made larger, so that the gas in the middle and late stages of thermal runaway can reach the pressure relief mechanism 22b as soon as possible through the second exhaust channel 25a, achieving rapid exhaust.

[0248] In some embodiments, the height A0 of the support member 25 is 2 mm to 10 mm.

[0249] By adopting the solution provided in this embodiment, the height of the second exhaust channel 25a can be made larger, and thus the exhaust space of the second exhaust channel 25a can be made larger, so that the gas in the middle and late stages of thermal runaway can reach the pressure relief mechanism 22b as soon as possible through the second exhaust channel 25a, achieving rapid exhaust.

[0250] In some embodiments, the cross-sectional area of ​​at least one second exhaust channel 25a is greater than or equal to 5 mm 2 .

[0251] The cross-sectional area of ​​the second exhaust passage 25a is the area of ​​a cross section obtained by cutting the second exhaust passage 25a with a plane perpendicular to the extending direction of the second exhaust passage 25a.

[0252] By adopting the solution provided in this embodiment, the cross-sectional area of ​​the second exhaust channel 25a is made larger, so that the gas can quickly pass through the second exhaust channel 25a to reach the pressure relief mechanism 22b.

[0253] In some embodiments, the melting point of support member 25 is greater than or equal to 350°C.

[0254] By adopting the solution provided in this embodiment, the supporting member 25 has a higher melting point, so that the supporting member 25 can maintain a stable structure in the middle and late stages of thermal failure of the battery cell 20 .

[0255] In some embodiments, the cross-section of the second exhaust passage 25 a is a triangular structure, a trapezoidal structure, or a groove structure.

[0256] By adopting the solution provided in this embodiment, the structure of the second exhaust passage 25a is stable and not easily deformed by squeezing.

[0257] In some embodiments, support member 25 is an integrally formed structure.

[0258] In this embodiment, the support member 25 can be manufactured by an integral forming process such as casting, molding, and bending.

[0259] The solution provided in this embodiment is adopted to ensure that the structure of the supporting member 25 is stable.

[0260] In some embodiments, the support member 25 is a metal member.

[0261] The structure provided in this embodiment makes the supporting member 25 have a stable structure, a strong supporting strength and a high melting point.

[0262] like Figure 7 As shown, in some embodiments, two groups of support members 25 are provided, and the two groups of support members 25 are respectively provided on both sides of the pressure relief mechanism 22b. The second exhaust channel 25a extends toward the pressure relief mechanism 22b.

[0263] Each group of support members 25 may be provided with one or more support members 25, which may be determined according to the use requirements. The second exhaust channel 25a extends toward the pressure relief mechanism 22b, which means that the flow direction of the gas discharged through the outlet of the second exhaust channel 25a is toward the pressure relief mechanism 22b.

[0264] By adopting the solution provided in this embodiment, the gas on both sides of the electrode assembly 23 can flow to the pressure relief mechanism 22b through the corresponding support member 25, which can achieve rapid exhaust, reduce the risk of cracking on any side of the battery cell 20, and improve the safety of the use of the battery cell 20.

[0265] According to some embodiments of the present application, the present application also provides a battery, which includes the battery cell provided by any of the above embodiments.

[0266] The battery provided in the embodiments of the present application, including the battery cell provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell and the battery in use.

[0267] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery provided by any of the above embodiments.

[0268] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0269] The electrical device provided in the embodiments of the present application, including the battery provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell, the battery and the electrical device.

[0270] Please refer to Figures 3 to 27 As shown, the present invention embodies a battery cell 20. The battery cell 20 includes a housing 20', an electrode assembly 23, an insulating member 24 and a supporting member 25.

[0271] The housing 20' has a first wall 22a, a second wall 22c and a pressure relief mechanism 22b, wherein the pressure relief mechanism 22b is disposed on the first wall 22a. The first wall 22a and the second wall 22c are disposed to intersect. The electrode assembly 23 is disposed in the housing 20'. A first space a is formed between the outer peripheral wall of the electrode assembly 23 and the second wall 22c.

[0272] The insulating member 24 is disposed in the housing 20' and is located between the first wall 22a and the electrode assembly 23. A second space b is formed between the insulating member 24 and the pressure relief mechanism 22b. A first exhaust channel 24a is provided on the insulating member 24. The first exhaust channel 24a communicates with the first space a and the second space b. The supporting member 25 is disposed in the housing 20' and is located between the first wall 22a and the insulating member 24. A second exhaust channel 25a is provided on the supporting member 25. The second exhaust channel 25a is used to communicate the first space a and the second space b.

[0273] The melting point of the support member 25 is greater than that of the insulating member 24. The insulating member 24 has at least two planes connected to each other and arranged at an angle, and all the planes or all the planes and the first wall 22a are surrounded to form a second exhaust channel 25a.

[0274] In some embodiments, the first wall 22a is an end cap 21, and the second wall 22c is one or more side walls connected to the first wall 22a. The pressure relief mechanism 22b is an explosion-proof valve. The first exhaust channel 24a can be a hole, a microporous structure, an opening, etc. opened on the insulating member 24, which can be determined according to the specific use requirements.

[0275] The first end surface 23c of the electrode assembly 23 in the first direction X is spaced apart from the second wall 22c, and at least a portion of the first space a is formed therebetween. The position of the support member 25 corresponds to the position of the first end surface 23c. The first direction X is the length direction of the electrode assembly 23. The support member 25 is spaced apart from the second wall 22c. The second exhaust channel 25a penetrates the support member 25 along the second direction Y. The second direction Y is parallel to the first direction X.

[0276] The support member 25 is an integrally formed metal member formed by bending a sheet. The support member 25 has a first support portion 253 and two bending portions 251. The two bending portions 251 are respectively formed at both ends of the length direction of the first support portion 253 and are spaced apart from each other. The spacing L2 between the two bending portions 251 is greater than or equal to 2 mm and less than or equal to the length of the first support portion 253. Any bending portion 251 and the first support portion 253 enclose a hollow channel with a triangular cross section. The hollow channel is the second exhaust channel 25a.

[0277] The support member 25 is welded to the first wall 22 a via the first support portion 253 .

[0278] In some embodiments, the bending portion 251 has a first sheet 2511 and a second sheet 2512 connected to each other and arranged at an angle. The height of the first sheet 2511 and the width of the second sheet 2512 satisfy the following relationship:

[0279] A0 / B0 is 0.2 to 2, preferably 0.5 to 1.3;

[0280] Wherein, B0 is the width of the second sheet 2512 , and A0 is the height of the first sheet 2511 .

[0281] The width of the bending portion 251 is 0.5 mm to 100 mm, preferably 1 mm to 50 mm.

[0282] In some embodiments, the insulating member 24 is provided with a receiving groove 241, and at least a portion of the support member 25 is located in the receiving groove 241. The entire support member 25 is located in the receiving groove 241. The insulating member 24 has a boss 242 protruding toward the electrode assembly 23, and the boss 242 is provided with a receiving groove 241. In this way, the positioning relationship of the support member 25 should take into account the position of the boss 242.

[0283] The width direction of the support member 25 is parallel to the width direction of the boss 242, and the width of the support member 25 and the width of the boss 242 satisfy the following conditions:

[0284] W1 / W0 is 0.15 to 0.87;

[0285] Wherein, W1 is the width of the supporting member 25 , and W0 is the width of the boss 242 .

[0286] The height direction of the support member 25 is parallel to the height direction of the boss 242, and the height of the support member 25 and the height of the boss 242 satisfy the following conditions:

[0287] A0 / H0 is 0.2 to 0.91, preferably 0.35 to 0.83;

[0288] Wherein, A0 is the height of the supporting member 25 , and H0 is the height of the boss 242 .

[0289] The length direction of the support member 25 is parallel to the width direction of the first wall 22a. The length of the support member 25 and the width of the first wall 22a satisfy the following conditions:

[0290] L1 / L0 is 0.1 to 0.8, preferably 0.2 to 0.6;

[0291] Wherein, L1 is the length of the supporting member 25, and L0 is the width of the first wall 22a.

[0292] A first center line of a projection pattern of the support member 25 on the first wall 22a and a second center line L of a projection pattern of the pressure relief mechanism 22b on the first wall 22a are located on the same straight line as much as possible, with a deviation of ≤30 mm.

[0293] The width of the support member 25 and the width of the first wall 22a satisfy the following conditions:

[0294] B0 / L0=0.02~0.5;

[0295] Here, B0 is the width of the supporting member 25, and L0 is the width of the first wall 22a.

[0296] The support member 25 is formed by bending and has a uniform wall thickness to ensure that it has sufficient strength. The wall thickness T0 of the support member 25 is 0.4 mm to 2 mm.

[0297] The height of the support member 25 is 1 mm to 20 mm, preferably 2 mm to 10 mm.

[0298] The cross-sectional area of ​​any second exhaust passage 25a is greater than or equal to 5 mm 2 .

[0299] The melting point of the support member 25 is greater than or equal to 350°C. The support member 25 is mainly made of aluminum alloy material, which is convenient for welding with the end cover 21, preferably Al 3003H18. The support member 25 is provided with two groups, which are arranged at both ends of the length direction of the end cover 21. After welding, the Z-direction tension of the support member 25 is ≥30N to ensure that it will not be washed away by the airflow.

[0300] The support member 25 adopts the solution provided in this embodiment, and the structure is stable and reliable. In the post-thermal runaway cavity, the support member 25 can form a stable triangular (or nearly triangular) structure to support until the thermal runaway process ends. In this way, when the battery cell 20 provided in this embodiment is adopted, in the late stage of thermal runaway of the battery cell 20, when the insulating member 24 melts, the support member 25 can continue to conduct the side cavity and the bottom of the pressure relief mechanism 22b like a bridge that will not fall down until the thermal runaway process ends.

[0301] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing having a first wall, a second wall and a pressure relief mechanism, wherein the pressure relief mechanism is arranged on the first wall, and the first wall and the second wall are arranged to intersect; An electrode assembly is disposed in the housing; a first space is formed between the outer peripheral wall of the electrode assembly and the second wall; an insulating member, disposed in the housing and between the first wall and the electrode assembly, a second space being formed between the insulating member and the pressure relief mechanism, and a first exhaust channel being provided on the insulating member; The first exhaust passage communicates with the first space and the second space; as well as a supporting member, disposed in the housing and between the first wall and the insulating member, wherein the supporting member is provided with a second exhaust passage, and the second exhaust passage is used to connect the first space and the second space; The melting point of the supporting member is greater than the melting point of the insulating member, the insulating member has at least two planes that are connected to each other and arranged at an angle, and at least two of the planes are arranged to form the second exhaust channel.

2. The battery cell according to claim 1, characterized in that: The first end surface of the electrode assembly in the first direction is spaced apart from the second wall, and at least a portion of the first space is formed therebetween. The position of the support member corresponds to the position of the first end surface.

3. The battery cell according to claim 2, characterized in that: The support member is spaced apart from the second wall, and the second exhaust passage penetrates the support member along a second direction, and the second direction is parallel to the first direction or is arranged at an angle to the first direction.

4. The battery cell according to claim 2, characterized in that: The first direction is the length direction of the electrode assembly.

5. The battery cell according to claim 1, characterized in that: The supporting member comprises: At least one bending portion, wherein the bending portion includes at least two sheets connected in sequence and arranged at an angle.

6. The battery cell according to claim 5, characterized in that: There are multiple bending portions, and the multiple bending portions are arranged in sequence along the third direction.

7. The battery cell according to claim 6, characterized in that: The third direction is a width direction of the first wall.

8. The battery cell according to claim 6, characterized in that: At least two of the bent portions are in contact with or connected to each other.

9. The battery cell according to claim 6, characterized in that: Two adjacent bending portions are arranged at intervals.

10. The battery cell according to claim 9, characterized in that: The support member further comprises: The connecting portion connects two adjacent bending portions that are spaced apart.

11. The battery cell according to claim 10, characterized in that: The connecting portion is spaced apart from the first wall, a third exhaust passage is formed between the connecting portion and the first wall, and the third exhaust passage is communicated with the second exhaust passage.

12. The battery cell according to claim 10, characterized in that: A surface of the connecting portion facing the first wall is a plane.

13. The battery cell according to any one of claims 5 to 12, characterized in that: At least two of the bending portions have different structures.

14. The battery cell according to any one of claims 5 to 12, characterized in that: At least one of the bent portions is disposed in a cavity surrounded by another of the bent portions.

15. The battery cell according to any one of claims 5 to 12, characterized in that: The bending portion includes at least three sheets connected in sequence, and any two adjacent sheets are arranged at an angle.

16. The battery cell according to any one of claims 5 to 12, characterized in that: The support member further comprises: The first supporting portion is located on a side of the bending portion close to the first wall and connected to the bending portion. The first supporting portion is used to contact the first wall surface.

17. The battery cell according to claim 16, characterized in that: There are two bending portions, and the two bending portions are arranged at two ends of the first supporting portion in the length direction.

18. The battery cell according to claim 17, characterized in that: The distance between the two bending portions is greater than or equal to 2 mm and less than or equal to the length of the first supporting portion.

19. The battery cell according to claim 16, characterized in that: The support member further comprises: The second supporting portion is located at a side of the bending portion away from the first supporting portion and is connected to the bending portion to enclose at least one second exhaust channel with the bending portion.

20. The battery cell according to claim 16, characterized in that: The bending portion has a first end and a second end facing the first supporting portion, the first end is connected to the first supporting portion, and the second end is spaced apart from, in contact with, or connected to the first supporting portion.

21. The battery cell according to claim 16, characterized in that: The first supporting portion includes at least one sheet.

22. The battery cell according to claim 16, characterized in that: The first supporting portion and the bending portion are formed by bending a sheet.

23. The battery cell according to any one of claims 5 to 12, characterized in that: The bending portion comprises a first sheet and a second sheet connected to each other and arranged at an angle, and the height of the first sheet and the width of the second sheet satisfy the following relationship: A0 / B0=0.2~2; Wherein, B0 is the width of the second sheet, and A0 is the height of the first sheet.

24. The battery cell according to any one of claims 5 to 12, characterized in that: The bending portion comprises a first sheet and a second sheet connected to each other and arranged at an angle, and the height of the first sheet and the width of the second sheet satisfy the following relationship: A0 / B0=0.5-1.3; Wherein, B0 is the width of the second sheet, and A0 is the height of the first sheet.

25. The battery cell according to claim 24, characterized in that The width of the second sheet and the width of the first wall satisfy the following conditions: B0 / L0=0.02~0.5; Wherein, L0 is the width of the first wall.

26. The battery cell according to any one of claims 5 to 12, characterized in that: The width of the bending portion is 0.5 mm to 100 mm.

27. The battery cell according to any one of claims 5 to 12, characterized in that: The width of the bending portion is 1 mm to 50 mm.

28. The battery cell according to any one of claims 1 to 12, characterized in that: The insulating member is provided with a receiving groove, and at least a portion of the supporting member is located in the receiving groove.

29. The battery cell according to claim 28, characterized in that The entirety of the supporting member is located in the receiving groove.

30. The battery cell according to claim 28, characterized in that The insulating component has a boss protruding toward the electrode assembly, and the boss is provided with the receiving groove.

31. The battery cell according to claim 30, characterized in that The width direction of the support member is parallel to the width direction of the boss, and the width of the support member and the width of the boss meet the following conditions: W1 / W0=0.15-0.87; Wherein, W1 is the width of the supporting member, and W0 is the width of the boss.

32. The battery cell according to claim 30, characterized in that The height direction of the support member is parallel to the height direction of the boss, and the height of the support member and the height of the boss meet the following conditions: A0 / H0=0.2~0.91; Wherein, A0 is the height of the supporting member, and H0 is the height of the boss.

33. The battery cell according to claim 30, characterized in that The height direction of the support member is parallel to the height direction of the boss, and the height of the support member and the height of the boss meet the following conditions: A0 / H0=0.35~0.83; Wherein, A0 is the height of the supporting member, and H0 is the height of the boss.

34. The battery cell according to claim 30, characterized in that The length direction of the support member is parallel to the width direction of the first wall, and the length of the support member and the width of the first wall satisfy the following conditions: L1 / L0=0.1~0.8; Wherein, L1 is the length of the supporting member, and L0 is the width of the first wall.

35. The battery cell according to claim 30, characterized in that The length direction of the support member is parallel to the width direction of the first wall, and the length of the support member and the width of the first wall satisfy the following conditions: L1 / L0=0.2~0.6; Wherein, L1 is the length of the supporting member, and L0 is the width of the first wall.

36. The battery cell according to claim 31, characterized in that The distance between the first center line of the projection figure of the support member on the first wall and the second center line of the projection figure of the pressure relief mechanism on the first wall is [0mm, 30mm], and the first center line and the second center line are both parallel to the length direction of the first wall.

37. The battery cell according to any one of claims 1 to 12, characterized in that: The support member is connected to the first wall.

38. The battery cell according to claim 37, characterized in that The material of the supporting member is the same as that of the first wall.

39. The battery cell according to any one of claims 1 to 12, characterized in that: The wall thickness T0 of the supporting member is 0.4 mm to 2 mm.

40. The battery cell according to any one of claims 1 to 12, characterized in that: The height of the supporting member is 1 mm to 20 mm.

41. The battery cell according to any one of claims 1 to 12, characterized in that: The height of the supporting member is 2 mm to 10 mm.

42. The battery cell according to any one of claims 1 to 12, characterized in that: The cross-sectional area of ​​at least one of the second exhaust passages is greater than or equal to 5 mm 2 .

43. The battery cell according to any one of claims 1 to 12, characterized in that: The supporting member has a melting point greater than or equal to 350°C.

44. The battery cell according to any one of claims 1 to 12, characterized in that: The cross section of the second exhaust channel is a triangular structure, a trapezoidal structure or a groove structure.

45. The battery cell according to any one of claims 1 to 12, characterized in that: The supporting member is an integrally formed structure.

46. ​​The battery cell according to any one of claims 1 to 12, characterized in that: The supporting member is a metal member.

47. The battery cell according to any one of claims 1 to 12, characterized in that: The support members are provided in two groups, and the two groups of support members are respectively arranged on both sides of the pressure relief mechanism, and the second exhaust passage extends toward the pressure relief mechanism.

48. A battery, characterized in that: A battery cell comprising any one of claims 1-47.

49. An electrical device, characterized in that: Comprising the battery of claim 48.

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