Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises: a housing, which comprises a housing cover and a housing body, and is provided with a pole; the electrode assembly comprises a conductive part and an active material coating part, and the conductive part is electrically connected with the active material coating part and the pole; the bracket is arranged in the shell body and is positioned at one end, far away from the shell cover, of the active substance coating part; the insulating part comprises a main body insulating part, a first insulating part and a second insulating part, the main body insulating part is arranged on the peripheral side of the active substance coating part, the first insulating part is arranged between the support and one end, far away from the shell cover, of the active substance coating part, and the second insulating part is arranged at one end, close to the shell cover, of the active substance coating part. According to the technical scheme provided by the embodiment of the invention, the risk of failure and damage of the electrode assembly can be reduced, the risk of corrosion of the shell is reduced, and the reliability and stability of the battery monomer are improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development. Among the related technologies, the reliability of battery cells needs to be improved, which hinders the further improvement of battery reliability. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device with higher reliability.

[0004] In the first aspect, the present application provides a battery cell, comprising: a shell, comprising a shell cover and a shell body with an opening, the shell cover covering the opening, and the shell being provided with a pole; an electrode assembly, comprising a conductive part and an active material coating part arranged in the shell, the conductive part electrically connecting the active material coating part and the pole; a bracket, arranged in the shell body at an end of the active material coating part away from the shell cover; an insulating member, comprising a main insulating part, a first insulating part and a second insulating part, the main insulating part being arranged on the peripheral side of the active material coating part, the first insulating part being arranged between the bracket and the end of the active material coating part away from the shell cover, and the second insulating part being arranged at an end of the active material coating part close to the shell cover.

[0005] In the technical solution of the embodiment of the present application, the insulating part is arranged to include a main insulating part, a first insulating part and a second insulating part, so that the insulating part can completely wrap the electrode assembly. During the process of loading the electrode assembly wrapped with the insulating part into the shell, the probability of the insulating part detaching from the electrode assembly can be reduced. After the electrode assembly is loaded into the shell, the first insulating part of the insulating part is located between the bracket and the active material coating part, that is, the active material coating part is further separated from the shell by the bracket, so as to substantially reduce the exposure of the active material coating part, further reduce the risk of failure and damage of the electrode assembly, and reduce the risk of corrosion of the shell, thereby improving the reliability and stability of the battery cell.

[0006] In some embodiments, the main insulating part is provided with a plurality of spaced liquid holes near the second insulating part. The plurality of liquid holes can increase the fluidity of the electrolyte, increase the contact area between the electrolyte and the active material coating part, and reduce the problem of poor wetting of the active material coating part.

[0007] In some embodiments, the plurality of liquid through holes are spaced apart in the length direction of the main insulating portion, which can improve the wetting effect of the insulating member.

[0008] In some embodiments, the distance between the liquid through hole and the second insulating portion is 1 mm-8 mm, which can improve the wetting effect of the insulating member.

[0009] In some embodiments, the distance between the liquid through hole and the second insulating portion is 3 mm-5 mm, which is beneficial to further improve the wetting effect of the insulating member.

[0010] In some embodiments, the diameter of the liquid hole is 0.5 mm to 1 mm. If the diameter of the liquid hole is too large, the insulating part will be easily broken, and if the diameter of the liquid hole is too small, the efficiency of the electrolyte infiltration will be affected. In this embodiment, by limiting the diameter of the liquid hole to meet the above conditions, not only the reliability of the insulating part can be improved, but also the efficiency of the insulating part infiltrating the electrolyte can be improved.

[0011] In some embodiments, the main insulating part includes multiple main parts; the multiple main parts are connected end to end in a ring shape, the multiple main parts are jointly wrapped around the circumference of the active material coating part and any two adjacent main parts are connected, the liquid holes are arranged in the main parts and the number of the liquid holes on each main part is greater than or equal to 3, which can improve the efficiency of the insulating part infiltrating the electrolyte.

[0012] In some embodiments, the housing is provided with an explosion-proof valve, and the insulating member has a vent hole corresponding to the position of the explosion-proof valve. By providing the vent hole in the insulating member, the explosion-proof valve can be connected to the vent hole, so that the explosion-proof valve can normally exhaust and release pressure.

[0013] In some embodiments, the explosion-proof valve is located on the wall of the shell body opposite to the bracket, the air vent is provided on the first insulating part, and the bracket has an exhaust hole corresponding to the position of the explosion-proof valve. In the above technical solution, in the process of installing the electrode assembly wrapped with the insulating member into the shell body, the first insulating part can move along the shell entry direction to gradually approach the bracket until the air vent corresponds to the explosion-proof valve, thereby reducing the probability of the explosion-proof valve damaging the first insulating part during the shell entry process, substantially reducing the bare leakage of the active material coating part, and reducing the risk of the shell being corroded, so as to further improve the reliability and stability of the electrode assembly and the battery cell.

[0014] In some embodiments, the number of the air holes is one; or, the number of the air holes is multiple and the multiple air holes are arranged at intervals in the length direction of the first insulating portion, which can improve exhaust efficiency.

[0015] In some embodiments, the number of the exhaust hole is one; or, the number of the exhaust holes is multiple and the multiple exhaust holes are arranged at intervals in the length direction and / or width direction of the bracket, which can improve the exhaust efficiency.

[0016] In some embodiments, the bracket includes: a bracket body, the bracket body having a first side and a second side arranged opposite to each other in the thickness direction thereof, the exhaust hole passing through the first side and the second side; a first abutting portion, arranged on the first side and protruding in a direction away from the second side, for abutting against an end of the active material coating portion away from the shell cover, so that the exhaust hole and the active material coating portion jointly form a first exhaust channel. In the above technical solution, by arranging the first abutting portion on the first side of the bracket body, the first abutting portion abuts against an end of the active material coating portion away from the shell cover, the distance between the first side of the bracket body and the active material coating portion can be increased, that is, the distance between the exhaust hole and the active material coating portion is increased, so that the first exhaust channel connected to the exhaust hole is defined between the first side of the bracket body and the active material coating portion, and the exhaust capacity is improved. When the battery cell has a tendency to thermal runaway, the generated gas can first enter the first exhaust channel, then pass through the bracket from the exhaust hole, and finally be discharged from the explosion-proof valve to achieve rapid pressure relief, thereby reducing the risk of combustion and explosion of the battery cell, reducing the impact on adjacent battery cells, and helping to improve the reliability and stability of the battery.

[0017] In some embodiments, the bracket is provided with a gas notch that passes through the first side and the second side, and the gas notch and the shell together form a gas passage, and the gas passage is connected to the first exhaust passage. In the above technical solution, by setting a gas notch on the bracket, the gas notch and the shell can be used to define a gas passage. On the one hand, the gas generated in the circumference of the electrode assembly can move to the explosion-proof valve position through the gas passage at the corresponding position in a short time to improve the timeliness of the pressure relief of the explosion-proof valve. At the same time, the gas in the first exhaust passage can flow to the exhaust hole and the gas passage respectively in a short time to achieve instantaneous pressure relief, and finally can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell, and improving the reliability and stability of the battery. On the other hand, during liquid injection, the electrolyte can flow toward the electrode assembly through the gas notch, which can shorten the infiltration time and improve the infiltration efficiency.

[0018] In some embodiments, the bracket is provided with a plurality of gas notches arranged at intervals on its circumference, each of the gas notches and the shell together form a gas passage, and the plurality of gas passages are arranged around the circumference of the first exhaust passage. By providing a plurality of gas notches, a plurality of gas passages can be defined, and a portion of the gas in the first exhaust passage can diffuse to the surroundings, pass through the bracket from the plurality of gas passages, and finally be discharged from the explosion-proof valve, which greatly reduces the risk of combustion and explosion of the battery monomer, greatly improves the reliability and stability of the battery, and the electrolyte can flow toward the electrode assembly through the plurality of gas notches during injection, further shortening the infiltration time and greatly improving the infiltration efficiency.

[0019] In some embodiments, the first side of the frame body is further provided with a first extension portion, the first extension portion is arranged around the circumference of the frame body and defines a matching groove with the frame body, and the end of the active material coating portion away from the shell cover is arranged in the matching groove. In the above technical solution, by providing the first extension portion, one end of the electrode assembly can be constrained, the stability of the electrode assembly during the shaking of the battery cell can be improved, the probability of the outer layer of the active material coating portion of the electrode assembly becoming fluffy can be reduced, and one end of the electrode assembly can be protected, reducing the problem of one end of the electrode assembly touching the shell, thereby reducing the phenomenon of the shell scratching the electrode assembly and improving the reliability of the battery cell.

[0020] In some embodiments, the gas notch is arranged through the first extension part and the frame body. The formed gas passage runs through both sides of the thickness direction of the support to connect the first exhaust passage and the explosion-proof valve. The gas in the first exhaust passage can flow to the exhaust hole and the gas passage respectively in a short time to achieve instantaneous pressure relief, and finally can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery monomer, and improving the reliability and stability of the battery.

[0021] In some embodiments, the first extension portion and the first abutment portion are spaced apart to form a first guide channel, and the first guide channel connects at least one of the gas passages and the first exhaust channel. In the above technical solution, the gas entering the first exhaust channel can flow to both sides of the exhaust hole in the length direction of the battery cell under the guidance of the two first guide channels to achieve instantaneous pressure relief, and then pass through the bracket from multiple gas passages, and finally can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell, and improving the reliability and stability of the battery. During liquid injection, the electrolyte can flow under the guidance of the two first guide channels, shortening the infiltration time and improving the infiltration efficiency.

[0022] In some embodiments, the second side of the frame body is provided with a second abutment portion protruding in a direction away from the first side, and the second abutment portion is used to abut against the wall of the shell where the explosion-proof valve is provided, and together form a second exhaust channel; the second exhaust channel is connected to at least one of the gas passages. In the above technical solution, by providing a second abutment portion on the second side of the frame body, the second abutment portion abuts against the wall of the shell where the explosion-proof valve is provided, so that the second exhaust channel connected to the gas passage is defined between the second side of the frame body and the wall of the shell, the space occupied by the exhaust path is increased, the exhaust capacity is improved, the risk of combustion and explosion of battery cells is reduced, and the impact on adjacent battery cells is reduced, which is conducive to improving the reliability and stability of the battery.

[0023] In some embodiments, a second extension portion is further convexly provided on the second side of the frame body, and the second extension portion is spaced apart from the second abutting portion to form a second guide channel, and the second guide channel connects at least one of the gas passages and the second exhaust channel. On the one hand, the second guide channel can increase the space occupied by the exhaust path, which is conducive to improving the exhaust capacity. On the other hand, it can play a guiding role. A part of the gas passing through the bracket from the gas passage can flow along the second guide channel to the second exhaust channel, and finally can be discharged from the explosion-proof valve to achieve pressure relief, further reducing the risk of combustion and explosion of the battery monomer, and improving the reliability and stability of the battery. In addition, the second guide channel can guide the flow of electrolyte, further shorten the infiltration time, and greatly improve the infiltration efficiency.

[0024] In some embodiments, in the length direction of the battery cell, the number of the gas notches on both sides of the exhaust hole is multiple, and the multiple gas notches on the same side share one second guide channel. In the above technical solution, the gas passing through the bracket can flow to the second exhaust channel located in the middle under the guidance of the second guide channel, and can eventually be discharged from the explosion-proof valve to achieve the final pressure relief, further reduce the risk of combustion and explosion of the battery cell, and improve the reliability and stability of the battery. The electrolyte can flow to multiple gas notches under the guidance of the second guide channel, shortening the infiltration time and improving the infiltration efficiency.

[0025] In some embodiments, the pole includes a first pole, the first pole is arranged on the wall of the shell body opposite to the shell cover, and the first insulating part is provided with an avoidance hole, the avoidance hole is used for the conductive part to pass through, so that the conductive part can be connected to the first pole. In the above technical solution, by providing the avoidance hole on the first insulating part, the first insulating part can avoid the conductive part, on the one hand, it can reduce the damage of the conductive part by the first insulating part, and on the other hand, it is convenient for the conductive part to be electrically connected with the first pole on the shell. In addition, when the electrolyte is injected into the shell, the electrolyte can enter the electrode assembly through the avoidance hole to accelerate the infiltration speed of the electrolyte.

[0026] In some embodiments, the pole includes two first poles with opposite polarities, and the first insulating portion is provided with two avoidance holes. The two first poles can be electrically connected to the conductive portions at the two avoidance holes on the first insulating portion, respectively, which makes the connection more convenient and helps to improve the assembly efficiency of the battery cell.

[0027] In some embodiments, the main body insulating part includes a plurality of main body parts; the plurality of main body parts are connected end to end in a ring shape, the plurality of main body parts are wrapped together on the peripheral side of the active material coating part and any two adjacent main body parts are connected, and the first insulating part and the second insulating part are respectively located at the axial ends of the ring structure formed by the plurality of main body parts. After the plurality of main body parts are connected, they are in a ring shape, which can completely wrap the peripheral side of the active material coating part, so that the peripheral side of the active material coating part is completely separated from the inner wall of the shell, and the first insulating part and the second insulating part wrap the axial ends of the active material coating part, so that the axial ends of the active material coating part are completely separated from the axial ends of the shell, reducing the risk of naked leakage of the active material coating part and improving the reliability and stability of the battery cell.

[0028] In some embodiments, the connection positions of any two adjacent main bodies are partially overlapped. In the above technical solution, on the one hand, the connection positions of the main bodies overlap, which is conducive to the connection of the two adjacent main bodies. For example, it is conducive to the connection of the two adjacent main bodies using the first tape, so that the connection position is not easy to separate or disconnect, which can reduce the probability and risk of insulation failure at the overlapping position of the two, and can improve the reliability of the electrode assembly, so as to improve the stability and reliability of the battery cell; on the other hand, the connection positions of the main bodies overlap, which can fully ensure that the entire insulating part can be wrapped around the circumference of the active material coating part, fully reduce the bare leakage of the active material coating part, and reduce the risk of corrosion of the shell, so as to further improve the reliability and stability of the electrode assembly and the battery cell.

[0029] In some embodiments, the peripheral side of the active material coating portion has multiple faces; each of the main body portions includes a main body face and two flanges arranged on both sides of the main body face, any two adjacent main body portions are connected by the flanges, and the connection structure of each main body face and each two flanges respectively wraps different faces of the peripheral side of the active material coating portion. In the above technical scheme, on the one hand, the connection of any two adjacent main body portions by flanges can ensure the reliability of the connection, so as to improve the reliability and stability of the electrode assembly and the battery cell; on the other hand, the main body face and the connection position of each two flanges respectively wrap different faces of the peripheral side of the active material coating portion, so that each face of the peripheral side of the active material coating portion can be effectively wrapped, which can further improve the reliability of the electrode assembly, so as to improve the stability and reliability of the battery cell.

[0030] In some embodiments, the peripheral side of the active material coating portion has four surfaces; the main insulating portion includes two main portions arranged on both sides of the first insulating portion, which are respectively a first main portion and a second main portion, the first main portion includes a first main surface and a first flange and a second flange arranged on both sides of the first main surface, the second main portion includes a second main surface and a third flange and a fourth flange arranged on both sides of the second main surface, the first flange and the third flange are connected, and the second flange and the fourth flange are connected; the first main surface, the first flange and the third flange connection structure, the second main surface, the second flange and the fourth flange connection structure respectively wrap the four surfaces arranged in sequence on the peripheral side of the active material coating portion. In an embodiment of the present application, the peripheral side of the active material coating portion has four surfaces, namely, two relatively large surfaces and two relatively small surfaces. The first main surface and the second main surface respectively cover the two relatively large surfaces on the peripheral side of the active material coating portion. The first flange and the third flange are connected to each other and cover a small surface on the peripheral side of the active material coating portion. The second flange and the fourth flange are connected to each other and cover another small surface on the peripheral side of the active material coating portion. The first insulating portion covers the end of the active material coating portion facing away from the opening, and the second insulating portion covers the end of the active material coating portion close to the opening.

[0031] In some embodiments, the second insulating portion includes a plurality of insulating sub-parts, and the plurality of insulating sub-parts are connected to the main body surfaces of the plurality of main body parts in a one-to-one correspondence, and any two adjacent insulating sub-parts are connected. In the process of installing the electrode assembly into the shell, the first insulating part enters the shell first, and the second insulating part enters the shell last. In this process, the insulating part can enter the shell along the shell entry direction, and the shell will not scrape the edge of the insulating part, thereby reducing the movement and slippage of the insulating part.

[0032] In some embodiments, any two adjacent insulating sections have partial overlap, making it difficult to separate the two adjacent insulating sections, reducing the probability and risk of insulation failure at the overlapping position of the two sections, substantially reducing the exposure of the active material coating section, reducing the risk of shell corrosion, and improving the reliability of the electrode assembly to improve the stability and reliability of the battery cell.

[0033] In some embodiments, the bracket is provided with a through hole exposing the first pole, the through hole is arranged opposite to the avoidance hole, the pole is provided with a receiving portion connected to the through hole, and at least part of the conductive portion passes through the avoidance hole and the through hole and then extends into the receiving portion and is connected to the pole. Since the pole is provided with a receiving portion, the hollow structure of the receiving portion can reduce the weight of the pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery, and on the other hand, the conductive portion can be accommodated in the receiving portion, which improves the assembly efficiency of the conductive portion, saves the space occupied by the conductive portion, and makes full use of the space of the battery cell, so that the cooperation between the bracket and the pole, and between the bracket and the conductive portion are tighter and more reliable, so that the structure of the battery cell is more compact, which is more conducive to the improvement of the energy density of the battery cell.

[0034] In some embodiments, it also includes: a protective member, which is arranged on at least one side of the peripheral side of the first insulating part and overlapped on the outer side of the main insulating part. In the above technical solution, by arranging the protective member on at least one side of the peripheral side of the first insulating part, on the one hand, the protective member can play a guiding role in the process of installing the electrode assembly into the shell, making it convenient to install the electrode assembly into the shell, and can also protect the insulating member, reduce the probability of the shell scratching the insulating member, and reduce the movement and slippage of the insulating member. On the other hand, after the electrode assembly is installed in the shell, the protective member is located between a part of the insulating member and the shell, which can further isolate the active material coating part from the shell, and cooperate with the insulating member to achieve double insulation, fully reduce the bare leakage of the active material coating part, and reduce the risk of the shell being corroded, so as to further improve the reliability and stability of the electrode assembly and the battery cell.

[0035] In a second aspect, the present application provides a battery, which includes the battery monomer in the above embodiment. In the technical solution of the embodiment of the present application, by adopting the above battery monomer, the reliability and stability of the battery can be improved.

[0036] In a third aspect, the present application provides an electric device, which includes the battery cell in the above embodiment; or, it includes the battery in the above embodiment. In the technical solution of the embodiment of the present application, by using the above battery cell or battery, the reliability and stability of the electric device can be improved.

[0037] 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

[0038] 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:

[0039] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0040] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0041] Figure 3 A perspective view of a battery provided for some embodiments of the present application;

[0042] Figure 4 An exploded view of a battery provided in some embodiments of the present application;

[0043] Figure 5 A schematic diagram of the structure of the electrode assembly, insulating member and protective member of the battery provided in some embodiments of the present application;

[0044] Figure 6 for Figure 5 The structure shown in is a side view at one viewing angle;

[0045] Figure 7 A structural cross-sectional view of a battery provided in some embodiments of the present application;

[0046] Figure 8 for Figure 7 An enlarged view of section A shown in;

[0047] Fig. 9 for Figure 7 An enlarged view of section B shown in;

[0048] Fig.10 A schematic structural diagram of a battery cell bracket provided in some embodiments of the present application at a viewing angle;

[0049] Fig.11 for Fig.10 A partial enlarged view of the bracket shown in;

[0050] Fig.12A schematic structural diagram of a battery cell bracket provided in some embodiments of the present application from another perspective;

[0051] Fig.13 for Fig.12 A partial enlarged view of the bracket shown in;

[0052] Fig.14 A schematic diagram of the structure of the electrode assembly, insulating member and protective member of the battery provided in some embodiments of the present application;

[0053] Fig.15 for Fig.14 A top view of the structure shown in FIG.

[0054] The reference numerals in the specific implementation manner are as follows:

[0055] Electric device 1000, battery 100, controller 200, motor 300,

[0056] Battery cell 10,

[0057] Box 20, first part 201, second part 202,

[0058] Shell 11, shell body 111, opening 1110, shell cover 112, first mounting hole 113, second mounting hole 114, first hole section 1151, second hole section 1152, third hole section 1153, fourth hole section 1154, first step surface 1161, second step surface 1162, third step surface 1163, upper plastic 117, lower plastic 118,

[0059] Pole 12, first pole 121, through hole 12130,

[0060] The electrode assembly 2, the active material coating portion 21, the conductive portion 22, the first conductive portion 221,

[0061] Bracket 3, matching groove 30, air passage 301, first exhaust passage 302, second exhaust passage 303, first guide passage 304, second guide passage 305, bracket body 31, first side 311, second side 312, exhaust hole 313, through hole 314, air notch 315, mounting recess 316, air hole 317, weight reduction groove 319, first abutting portion 321, second abutting portion 322, first extension portion 331, second extension portion 332,

[0062] Insulating member 4, notch 401, first notch 401a, second notch 401b, third notch 401c, main insulating portion 41, main portion 410, liquid hole 410a, first main portion 411, first main surface 4111, first flange 4112, second flange 4113, second main portion 412, second main surface 4121, third flange 4122, fourth flange 4123, first insulating portion 42, air hole 421, avoidance hole 422, second insulating portion 43, insulating sub-portion 430,

[0063] Protective part 5, explosion-proof valve 6, protective sheet 61, slot cover 7. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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).

[0070] 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.

[0071] 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.

[0072] 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.

[0073] In the related art, a battery cell generally includes a shell body with an opening, a shell cover, an electrode assembly, an insulating part and a plastic part. The insulating part is connected to the peripheral side of the plastic part to cover the electrode assembly together to achieve insulation between the electrode assembly and the shell. However, when the electrode assembly of the above structure is installed in the shell, the insulating part is prone to wrinkles and edge curling during the friction with the shell, and even easily detaches from the plastic part, resulting in the electrode assembly being exposed, so that the electrode assembly contacts the inner wall surface of the shell, causing the shell to be corroded, affecting the reliability of the battery cell.

[0074] In view of this, in order to solve the above-mentioned problems, the present application provides a battery cell including a shell, an electrode assembly, a bracket and an insulating part. The insulating part can completely wrap the electrode assembly. During the process of loading the electrode assembly wrapped with the insulating part into the shell, the probability of the insulating part detaching from the electrode assembly can be reduced. After the electrode assembly is loaded into the shell, the first insulating part of the insulating part is located between the bracket and the active material coating part. The bracket can be used to separate the first insulating part and the shell, thereby further reducing the risk of corrosion of the shell.

[0075] 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.

[0076] For the convenience of description, the following embodiments are described by taking an electric device 1000 of an embodiment of the present application as a vehicle as an example.

[0077] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 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, and the battery 100 may be provided at the bottom, head or tail of the vehicle. The battery 100 may be used to power the vehicle, for example, the battery 100 may be used as an operating power source for the vehicle. The vehicle 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.

[0078] In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0079] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a battery cell 10 , wherein the battery cell 10 is accommodated in the housing 20 .

[0080] The box 20 is used to provide a storage space for the battery cell 10, and the box 20 can adopt a variety of structures. In some embodiments, the box 20 may include a first part 201 and a second part 202, the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage space for accommodating the battery cell 10. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage space; the first part 201 and the second part 202 may also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box 20 formed by the first part 201 and the second part 202 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0081] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 100 may also be a battery 100 module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. 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 10.

[0082] Each battery cell 10 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 10 may be cylindrical, flat, rectangular, or in other shapes.

[0083] Please refer to Figure 3 and Figure 4 , Figure 3 A three-dimensional diagram of a battery 100 provided in accordance with some embodiments of the present application. Figure 4 The exploded view of the battery 100 provided in some embodiments of the present application. The battery cell 10 refers to the smallest unit constituting the battery 100 , and the battery cell 10 includes a housing 11 , an electrode assembly 2 and an insulating member 4 , and the housing 11 includes a housing cover 112 and a housing body 111 with an opening 1110 .

[0084] The shell cover 112 refers to a component that covers the opening 1110 of the shell body 111 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the shell cover 112 can be adapted to the shape of the shell body 111 to match the shell body 111. Optionally, the shell cover 112 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the shell cover 112 is not easily deformed when it is squeezed and collided, so that the battery cell 10 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the shell cover 112. The electrode terminal can be used to electrically connect to the electrode assembly 2 for outputting or inputting electrical energy of the battery cell 10. In some embodiments, the shell cover 112 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The material of the shell cover 112 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 4 may be provided inside the shell cover 112 to isolate the electrical connection components in the shell body 111 from the shell cover 112 to reduce the risk of short circuit. For example, the insulating member 4 may be made of plastic, rubber, or the like.

[0085] The shell body 111 is a component used to cooperate with the shell cover 112 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 2, the electrolyte and other components. The shell body 111 and the shell cover 112 can be independent components, and an opening 1110 can be set on the shell body 111, and the shell cover 112 is made to cover the opening 1110 at the opening 1110 to form the internal environment of the battery cell 10. Without limitation, the shell cover 112 and the shell body 111 can also be integrated. Specifically, the shell cover 112 and the shell body 111 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell body 111, the shell cover 112 is made to cover the shell body 111. The shell body 111 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 body 111 can be determined according to the specific shape and size of the electrode assembly 2. The shell 111 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special limitation on this.

[0086] The electrode assembly 2 is a component where electrochemical reactions occur in the battery cell 10 . Figure 3 and Figure 4The X direction is the length direction of the electrode assembly 2, the Y direction is the thickness direction of the electrode assembly 2, and the Z direction is the height direction of the electrode assembly 2. The electrode assembly 2 may include one or more battery cells. The electrode assembly 2 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 2, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0087] In some embodiments, the electrode terminal is a pole 12 and the pole 12 is disposed on the shell 11. The electrode assembly 2 includes a conductive part 22 and an active material coating part 21. The active material coating part 21 is disposed in the shell 11. The conductive part 22 electrically connects the active material coating part 21 and the pole 12 to form a current loop.

[0088] Please refer again Figure 4 , and further refer to Figure 5 , Figure 5 The schematic diagram of the structure of the electrode assembly 2, the insulating member 4 and the protective member 5 of the battery 100 provided in some embodiments of the present application. The battery cell 10 further includes a bracket 3, which is arranged in the shell body 111 and is located at one end of the active material coating portion 21 away from the shell cover 112.

[0089] The battery cell 10 also includes an insulating member 4, which includes a main insulating portion 41, a first insulating portion 42 and a second insulating portion 43. The main insulating portion 41 is arranged on the peripheral side of the active material coating portion 21, and the first insulating portion 42 is arranged between the bracket 3 and the end of the active material coating portion 21 away from the shell cover 112, that is, the first insulating portion 42 of the insulating member 4 is clamped between the bracket 3 and the end of the active material coating portion 21 away from the shell cover 112, and the second insulating portion 43 is arranged at the end of the active material coating portion 21 close to the shell cover 112.

[0090] Among them, the cross-section of the active material coating part 21 can be circular, rectangular or polygonal, etc. When the cross-section of the active material coating part 21 is circular, the main insulating part 41 can be rolled into a shape that matches the shape of the circumference (cylindrical surface) of the active material coating part 21 to wrap the circumference of the active material coating part 21, that is, the cross-sectional shape of the main insulating part 41 is a circular ring. When the cross-section of the active material coating part 21 is rectangular, the main insulating part 41 can be folded into a shape that matches the shape of the circumference (four side walls) of the active material coating part 21 to wrap the circumference of the active material coating part 21, that is, the cross-sectional shape of the main insulating part 41 is a rectangular ring. When the cross-section of the active material coating part 21 is polygonal, the main insulating part 41 can be folded into a shape that matches the shape of the circumference (multiple side walls) of the active material coating part 21 to wrap the circumference of the active material coating part 21, that is, the cross-sectional shape of the main insulating part 41 is a polygonal ring.

[0091] In the technical solution of the embodiment of the present application, by setting the insulating part 4 to include a main insulating part 41, a first insulating part 42 and a second insulating part 43, the insulating part 4 can completely wrap the electrode assembly 2. During the process of installing the electrode assembly 2 wrapped with the insulating part 4 into the shell 11, the probability of the insulating part 4 detaching from the electrode assembly 2 can be reduced. After the electrode assembly 2 is installed into the shell 11, the first insulating part 42 of the insulating part 4 is located between the bracket 3 and the active material coating part, that is, the bracket 3 is used to further separate the active material coating part 21 from the shell 11, so as to fully reduce the exposure of the active material coating part 21, further reduce the risk of failure and damage of the electrode assembly 2, and reduce the risk of corrosion of the shell 11, thereby improving the reliability and stability of the battery cell 10.

[0092] Please refer again Figure 5 The main insulating part 41 is provided with a liquid through hole 410a near the second insulating part 43. The number of the liquid through holes 410a can be multiple, and the multiple liquid through holes 410a are arranged at intervals. The multiple liquid through holes 410a can increase the fluidity of the electrolyte, increase the contact area between the electrolyte and the active material coating part 21, and reduce the problem of poor wetting of the active material coating part 21.

[0093] Among them, the shape of the liquid hole 410a can be a round hole, a square hole, etc., the shapes of multiple liquid holes 410a can be the same or different, and the flow areas of multiple liquid holes 410a can be equal or different. The number of liquid holes 410a can be two, three or more than three. The shape and parameter design of the liquid hole 410a can be selected according to actual needs.

[0094] Please refer again Figure 5 , and further refer to Figure 6 , Figure 6 for Figure 5 The structure shown in FIG. 1 is a side view at a viewing angle. As an optional embodiment, a plurality of liquid holes 410a are arranged at intervals in the length direction of the main body insulating portion 41, and the sum of the dimensions of the plurality of liquid holes 410a in the length direction of the main body insulating portion 41 is less than half of the length L of the main body insulating portion 41, so that the insulating member 4 has the effect of being infiltrated with electrolyte, and the influence on the strength of the insulating member 4 is reduced as much as possible.

[0095] In order to improve the wetting effect of the insulating member 4, the distance h between the liquid through hole 410a and the second insulating portion 43 can be 1mm-8mm, for example, the distance h between each liquid through hole 410a and the second insulating portion 43 can be 1mm, 2mm, 5mm, 6mm, or 8mm.

[0096] In some specific embodiments, the distance h between the liquid through hole 410 a and the second insulating portion 43 is 3 mm-5 mm, which is beneficial to further improve the wetting effect of the insulating member 4 .

[0097] Please refer again Figure 6 , the diameter d of the liquid hole 410a is 0.5mm-1mm. For example, the diameter of the liquid hole 410a can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm. If the diameter of the liquid hole 410a is too large, the insulating member 4 will be easily broken, and if the diameter of the liquid hole 410a is too small, the efficiency of the electrolyte infiltration will be affected. In this embodiment, by limiting the diameter of the liquid hole 410a to meet the above conditions, not only the reliability of the insulating member 4 can be improved, but also the efficiency of the insulating member 4 infiltrating the electrolyte can be improved.

[0098] Please refer again Figure 5 and Figure 6 The main insulating portion 41 includes a plurality of main portions 410; the plurality of main portions 410 are connected end to end in a ring shape, the plurality of main portions 410 are wrapped together on the peripheral side of the active material coating portion 21 and any two adjacent main portions 410 are connected, liquid holes 410a are provided in the main portions 410, and the number of liquid holes 410a on each main portion 410 is greater than or equal to 3, thereby improving the efficiency of the insulating member 4 infiltrating the electrolyte.

[0099] In some embodiments, the distance between two adjacent liquid holes 410a is m1, and in the two adjacent side walls of the electrode assembly 2, the distance between the outermost liquid hole 410a on the main body 410 covering one of the side walls and the other side wall is m2, and m2 is smaller than m1, which can further improve the efficiency of the insulating member 4 in soaking the electrolyte. Among them, m1 can be 20mm-35mm, for example, m1 can be 20mm, 24mm, 28mm, 30mm, 32mm, 35mm, etc., and m2 can be 5mm-20mm, for example, m2 can be 5mm, 8mm, 10mm, 15mm, 20mm, etc.

[0100] The housing 11 is provided with an explosion-proof valve 6, and the insulating member 4 has an air hole 421, which corresponds to the position of the explosion-proof valve 6. The explosion-proof valve 6 is an integrally formed member and has a thinned portion on the explosion-proof valve 6; or, the explosion-proof valve 6 is a split structure. By providing the air hole 421 on the insulating member 4, the explosion-proof valve 6 can be connected to the air hole 421, so that the explosion-proof valve 6 can be normally exhausted and depressurized.

[0101] In some embodiments, the explosion-proof valve 6 may be disposed on the shell cover 112 , and correspondingly, the air vent 421 is disposed on the second insulating portion 43 of the insulating member 4 .

[0102] In other embodiments, the explosion-proof valve 6 may be disposed on the side wall of the shell body 111 , and correspondingly, the air vent 421 is disposed on the main insulating portion 41 of the insulating member 4 .

[0103] Please refer again Figure 3-Figure 5 The explosion-proof valve 6 is located on the wall of the shell body 111 opposite to the bracket 3, the air hole 421 is provided in the first insulating portion 42, and the bracket 3 has an exhaust hole 313, and the exhaust hole 313 corresponds to the position of the explosion-proof valve 6.

[0104] In the above technical solution, in the process of installing the electrode assembly 2 wrapped with the insulating part 4 into the shell body 111, the first insulating part 42 can move along the shell entry direction to gradually approach the bracket 3 until the air vent 421, the exhaust hole 313 on the bracket 3, and the explosion-proof valve 6 correspond to each other, thereby reducing the probability of the explosion-proof valve 6 damaging the first insulating part 42 during the shell entry process, substantially reducing the exposure of the active material coating part 21, and reducing the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0105] Please refer to further Figure 7-Figure 8 , Figure 7 A structural cross-sectional view of a battery 100 provided in some embodiments of the present application, Figure 8 for Figure 7 The explosion-proof valve 6 and the shell body 111 can be fixedly connected or detachably connected.

[0106] Specifically, a first mounting hole 113 and a second mounting hole 114 are provided on the shell body 111, the pole 12 is arranged in the first mounting hole 113, and the explosion-proof valve 6 is arranged at the second mounting hole 114 and covers the second mounting hole 114 to close the second mounting hole 114, isolating the environment inside the shell body 111 from the external environment.

[0107] Among them, one side of the explosion-proof valve 6 faces the inside of the shell body 111, and this side of the explosion-proof valve 6 will be affected by the pressure inside the battery cell 10. When the pressure inside the battery cell 10 is higher than the critical value, the pressure inside the battery cell 10 can break through the explosion-proof valve 6. At this time, the inside of the shell body 111 is connected to the external environment to achieve pressure relief of the battery cell 10. The provision of the explosion-proof valve 6 can improve the safety of the use of the battery cell 10 and reduce the possibility of explosion of the battery cell 10.

[0108] Please refer again Figure 7 , and further refer to Fig. 9 , Fig. 9 for Figure 7 The second mounting hole 114 includes a first hole segment 1151 and a second hole segment 1152, which are arranged and connected in the thickness direction of the shell body 111, and the second hole segment 1152 is closer to the inner cavity of the shell body 111 relative to the first hole segment 1151.

[0109] A first step surface 1161 is formed between the first hole section 1151 and the second hole section 1152 , and the explosion-proof valve 6 is disposed in the first hole section 1151 and matched with the first step surface 1161 .

[0110] Optionally, the second mounting hole 114 also includes a third hole section 1153, the third hole section 1153 is connected to an end of the first hole section 1151 away from the second hole section 1152, a second step surface 1162 is formed between the first hole section 1151 and the third hole section 1153, the explosion-proof valve 6 is welded to the shell body 111 to form a weld, and the third hole section 1153 is used to accommodate the weld.

[0111] Alternatively, if Figure 3 and Figure 4 , Figure 7-Figure 8 As shown, the battery cell 10 further includes a protective sheet 61, which is disposed on the side of the explosion-proof valve 6 away from the second hole section 1152 and is used to cover the explosion-proof valve 6. The protective sheet 61 may be a plate-like structure or a membrane-like structure, which is not limited here.

[0112] In the above technical solution, the protective sheet 61 covering the explosion-proof valve 6 can separate the explosion-proof valve 6 from the external environment, play a dust-proof role, and can reduce the area of ​​contact between the explosion-proof valve 6 and the external air, which is convenient to reduce the oxidation rate of the explosion-proof valve 6.

[0113] Among them, the second mounting hole 114 also includes a fourth hole section 1154, the fourth hole section 1154 is connected to the end of the third hole section 1153 away from the first hole section 1151, a third step surface 1163 is formed between the fourth hole section 1154 and the third hole section 1153, and the protective sheet 61 is arranged in the fourth hole section 1154 and cooperates with the third step surface 1163.

[0114] In some embodiments, the number of the exhaust hole 313 is one. In other embodiments, please refer to Figure 4 There are multiple exhaust holes 313, and the multiple exhaust holes 313 are arranged at intervals in the length direction and / or width direction of the bracket 3. Such an arrangement can improve the exhaust efficiency.

[0115] In some embodiments, the number of the vent hole 421 is one. In other embodiments, please refer to Figure 5 There are multiple air holes 421, and the multiple air holes 421 are arranged at intervals in the length direction of the first insulating part 42. The multiple air holes 421 can be arranged in the middle of the length direction of the first insulating part 42 and at intervals in the length direction of the first insulating part 42. Such an arrangement can improve the exhaust efficiency.

[0116] Please refer to Fig.10 and Fig.11 , Fig.10 A schematic structural diagram of a bracket 3 of a battery cell 10 provided in some embodiments of the present application at a viewing angle; Fig.11 for Fig.10 The bracket 3 includes a bracket body 31, the bracket body 31 has a first side 311 and a second side 312, the first side 311 and the second side 312 are arranged opposite to each other in the thickness direction of the bracket body 31, and the exhaust hole 313 runs through the first side 311 and the second side 312.

[0117] The bracket 3 also includes a first abutment portion 321, which is arranged on the first side 311 of the bracket body 31, and the first abutment portion 321 protrudes in the direction away from the second side 312 of the bracket body 31. The first abutment portion 321 is used to abut against an end of the active material coating portion 21 away from the shell cover 112, so that the exhaust hole 313 and the active material coating portion 21 jointly form a first exhaust channel 302.

[0118] The first abutting portion 321 is arranged on the first side 311 of the frame body 31. Specifically, the first abutting portion 321 is arranged on the side of the frame body 31 facing the active material coating portion 21. Since the first abutting portion 321 abuts against the end of the active material coating portion 21 away from the shell cover 112, the first side 311 of the frame body 31 and the end of the active material coating portion 21 away from the shell cover 112 are separated and arranged to define a first exhaust channel 302 between the first side 311 of the frame body 31 and the active material coating portion 21, and the exhaust hole 313 is connected between the first exhaust channel 302 and the explosion-proof valve 6.

[0119] In the above technical solution, by setting the first abutting portion 321 on the first side 311 of the frame body 31, the first abutting portion 321 abuts against the end of the active material coating portion 21 away from the shell cover 112, so that the distance between the first side 311 of the frame body 31 and the active material coating portion 21 can be increased, that is, the distance between the exhaust hole 313 and the active material coating portion 21 is increased, so that the first side 311 of the frame body 31 and the active material coating portion 21 are defined with the first exhaust channel 302 connected with the exhaust hole 313, thereby improving the exhaust capacity. When the battery cell 10 tends to have thermal runaway, the generated gas can first enter the first exhaust channel 302, and then pass through the bracket 3 from the exhaust hole 313, and finally can be discharged from the explosion-proof valve 6 to achieve rapid pressure relief, thereby reducing the risk of combustion and explosion of the battery cell 10 and reducing the impact on adjacent battery cells 10, which is conducive to improving the reliability and stability of the battery 100.

[0120] Please refer again Fig.10 and Fig.11 The bracket 3 is provided with an air-passing notch 315 in the circumference thereof, and the air-passing notch 315 passes through the first side 311 and the second side 312 of the bracket body 31. The circumference of the bracket 3 cooperates with the shell 11, so that an air-passing channel 301 is formed between the air-passing notch 315 and the shell 11, and the air-passing channel 301 is connected to the first exhaust channel 302.

[0121] The meaning of the notch is a gap formed by a missing piece on the edge of a structure. The air gap 315 in the embodiment of the present application refers to a gap formed by a missing piece on the circumference of the bracket 3. When the bracket 3 is matched with the shell 11, the shell 11 can close the opening 1110 of the air gap 315 to define the air passage 301.

[0122] When the battery cell 10 tends to experience thermal runaway, the generated gas can first enter the first exhaust channel 302, part of the gas can pass through the bracket 3 through the exhaust hole 313, and the other part of the gas can pass through the bracket 3 through the gas passage 301, and finally can be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0123] In the above technical scheme, by setting a gas notch 315 on the bracket 3, the gas notch 315 can be used to define a gas channel 301 with the shell 11. On the one hand, the gas generated in the circumference of the electrode assembly 2 can move to the position of the explosion-proof valve 6 through the gas channel 301 at the corresponding position in a short time, so as to improve the timeliness of the pressure relief of the explosion-proof valve 6. At the same time, the gas in the first exhaust channel 302 can flow to the exhaust hole 313 and the gas channel 301 respectively in a short time to achieve instantaneous pressure relief, and finally can be discharged from the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. On the other hand, when injecting liquid, the electrolyte can flow toward the electrode assembly 2 through the gas notch 315, which can shorten the infiltration time and improve the infiltration efficiency.

[0124] In some embodiments, a plurality of air gaps 315 are provided around the circumference of the bracket 3, and the plurality of air gaps 315 are arranged at intervals. For example, the plurality of air gaps 315 may be evenly distributed around the circumference of the bracket 3, or may be concentrated at local positions around the circumference of the bracket 3. Each air gap 315 forms an air passage 301 together with the shell 11, and the plurality of air passages 301 are arranged around the circumference of the first exhaust passage 302.

[0125] Therefore, by setting a plurality of gas gaps 315, a plurality of gas passages 301 can be defined, and a portion of the gas in the first exhaust passage 302 can diffuse to the surroundings, pass through the bracket 3 from the plurality of gas gaps 301, and finally be discharged from the explosion-proof valve 6, thereby greatly reducing the risk of combustion and explosion of the battery cell 10, and greatly improving the reliability and stability of the battery 100. During liquid injection, the electrolyte can flow toward the electrode assembly 2 through the plurality of gas gaps 315, further shortening the infiltration time and greatly improving the infiltration efficiency.

[0126] Please refer again Fig.10 and Fig.11 A first extension portion 331 is also protruded from the first side 311 of the frame body 31. The first extension portion 331 is arranged around the circumference of the frame body 31, and the first extension portion 331 and the frame body 31 define a matching groove 30, and the end of the active material coating portion 21 away from the shell cover 112 is arranged in the matching groove 30.

[0127] That is, the bracket body 31 is arranged at the end of the electrode assembly 2, and the first extension portion 331 is arranged on the peripheral side of the electrode assembly 2. It should be noted that the bracket 3 can be assembled with the electrode assembly 2 and then installed into the shell 11 together, or the bracket 3 can be pre-installed on the shell 11, and then the electrode assembly 2 is installed in the shell 11 and matched with the bracket 3.

[0128] In the embodiment where the bracket 3 and the electrode assembly 2 are assembled and loaded into the shell 11 together, during the shell insertion process, the first extension portion 331 can protect the electrode assembly 2, reduce the probability of the electrode assembly 2 touching the shell 11, and further reduce the occurrence of the shell 11 scratching the electrode assembly 2, so as to reduce the possibility of the active material of the electrode assembly 2 falling off, to a certain extent prevent the internal short circuit caused by the overlapping of the fallen active material and the pole piece of opposite polarity, and to a certain extent prevent the chemical reaction between the fallen active material and the shell 11, thereby causing the shell 11 to be corroded and penetrated, thereby improving the reliability of the battery cell 10, and the first extension portion 331 and the electrode assembly 2 can be snap-connected, to a certain extent prevent the bracket 3 from falling off before entering the shell, thereby improving the product quality rate of the battery cell 10. After entering the shell, the first extension portion 331 can constrain one end of the electrode assembly 2, reduce the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protect one end of the electrode assembly 2, reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the phenomenon of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0129] In an embodiment in which the bracket 3 is pre-installed on the shell 11 and the electrode assembly 2 is subsequently installed into the shell 11, the first extension portion 331 can constrain one end of the electrode assembly 2, reduce the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protect one end of the electrode assembly 2, thereby reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the phenomenon of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0130] Therefore, in the above technical solution, by setting the first extension portion 331, one end of the electrode assembly 2 can be constrained, thereby improving the stability of the electrode assembly 2 during the shaking of the battery cell 10, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and protecting one end of the electrode assembly 2, thereby reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0131] The gas notch 315 is arranged through the first extension part 331 and the frame body 31. The formed gas passage 301 passes through both sides of the thickness direction of the bracket 3 to connect the first exhaust passage 302 and the explosion-proof valve 6. The gas in the first exhaust passage 302 can flow to the exhaust hole 313 and the gas passage 301 in a short time to achieve instantaneous pressure relief, and finally can be discharged from the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100.

[0132] In some embodiments, the first extension portion 331 and the first abutment portion 321 are spaced apart from each other, and the first extension portion 331 and the first abutment portion 321 together form a first guide channel 304 , and the first guide channel 304 connects at least one gas passage 301 and the first exhaust channel 302 .

[0133] On the one hand, the first guide channel 304 can increase the space occupied by the exhaust path, which is conducive to improving the exhaust capacity. On the other hand, it can play a guiding role, so that part of the gas entering the first exhaust channel 302 can flow along the first guide channel 304 to the gas passage 301. The gas passes through the bracket 3 through the gas passage 301 and can eventually be discharged from the explosion-proof valve 6 to achieve pressure relief, further reducing the risk of combustion and explosion of the battery cell 10 and improving the reliability and stability of the battery 100. In addition, the first guide channel 304 can guide the flow of electrolyte, further shorten the infiltration time, and greatly improve the infiltration efficiency.

[0134] In the length direction of the battery cell 10 (the X direction as shown in the figure), there are multiple gas holes 315 on both sides of the exhaust hole 313, and the multiple gas holes 315 on the same side of the exhaust hole 313 share a first guide channel 304.

[0135] That is to say, the multiple air gaps 315 can be divided into two parts, and the two parts of the air gaps 315 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. Correspondingly, the number of the first guide channels 304 is two, and the two first guide channels 304 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. In the length direction of the battery cell 10, the first guide channel 304 located on one side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the first guide channel 304 is connected with the multiple air gaps 315 at the corresponding positions, and the first guide channel 304 located on the other side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the first guide channel 304 is connected with the multiple air channels 301 at the corresponding positions.

[0136] When the battery cell 10 tends to experience thermal runaway, the generated gas can first enter the first exhaust channel 302, a part of the gas can pass through the bracket 3 through the exhaust hole 313 and flow to the second side 312 of the bracket body 31, and the other part of the gas can be diverted through the two first guide channels 304, and then pass through the bracket 3 from multiple gas passages 301, flow to the second side 312 of the bracket body 31, and finally can be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0137] In the above technical solution, the gas entering the first exhaust channel 302 can flow to both sides of the exhaust hole 313 in the length direction of the battery cell 10 under the guidance of the two first guide channels 304 to achieve instantaneous pressure relief, and then pass through the bracket 3 from multiple gas passages 301, and finally be discharged from the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. During liquid injection, the electrolyte can flow under the guidance of the two first guide channels 304, shortening the infiltration time and improving the infiltration efficiency.

[0138] Please refer again Fig.10 and Fig.11 The first abutting portion 321 is arranged in an arc shape, so that the first abutting portion 321 and the first extending portion 331 define an arc-shaped first guide channel 304, and can reduce the contact area between the bracket 3 and the end of the electrode assembly 2, thereby reducing the probability of pressure loss of the bracket 3 on the end of the electrode assembly 2.

[0139] There are two first abutting portions 321, which are respectively located at two sides of the exhaust hole 313. For example, the two first abutting portions 321 are respectively formed as arc-shaped plates, and the two ends of each arc-shaped plate are spaced apart and arranged opposite to the exhaust hole 313.

[0140] Among them, multiple air notches 315 located on the same side of the exhaust hole 313 are arranged at circumferential intervals around the corresponding first abutment portion 321, so that the multiple air notches 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding first guide channel 304, so that the multiple air channels 301 are all connected to the same first guide channel 304, and the gas at the first exhaust channel 302 flows around the first exhaust channel 302 under the guidance of the two first guide channels 304, passes through the bracket 3 through the multiple air channels 301, and can finally be discharged from the explosion-proof valve 6.

[0141] Therefore, in the above technical solution, the first abutting portion 321 is arranged in an arc shape, which can reduce the probability of pressure loss of the bracket 3 on the end of the electrode assembly 2, and on the other hand, it can define the first guide channel 304 arranged in an arc shape with the first extension portion 331, increase the occupied space of the first guide channel 304, make the multiple gas notches 315 located on the same side of the exhaust hole 313 communicate with the first guide channel 304, improve the space utilization of the bracket 3, and further improve the exhaust capacity. In addition, the infiltration time can be further shortened and the infiltration efficiency can be improved.

[0142] Please refer again Fig.10 , and further refer to Fig.12 and Fig.13 , Fig.12This is a schematic structural diagram of the bracket 3 of the battery cell 10 provided in some embodiments of the present application at another viewing angle. Fig.13 for Fig.12 A partial enlarged view of the bracket 3 is shown in FIG. A second abutting portion 322 is provided on the second side 312 of the bracket body 31. The second abutting portion 322 is protruded in a direction away from the first side 311. The second abutting portion 322 is used to abut against the wall of the shell 11 where the explosion-proof valve 6 is provided. The bracket 3 and the shell 11 jointly form a second exhaust channel 303. The second exhaust channel 303 is connected to at least one gas passage 301.

[0143] The second abutment portion 322 is arranged on the second side 312 of the frame body 31. Specifically, the second abutment portion 322 is arranged on a side of the end of the frame body 31 away from the electrode assembly 2. Since the second abutment portion 322 abuts against the wall of the shell 11 where the explosion-proof valve 6 is arranged, the second side 312 of the frame body 31 is separated from the wall of the shell 11 to define a second exhaust channel 303 between the second side 312 of the frame body 31 and the wall of the shell 11.

[0144] When the battery cell 10 tends to experience thermal runaway, the generated gas can first enter the first exhaust channel 302, part of the gas passes through the bracket 3 from the exhaust hole 313, and the other part of the gas passes through the bracket 3 through the gas channel 301, and finally gathers in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0145] In the above technical solution, by setting a second abutment portion 322 on the second side 312 of the frame body 31, the second abutment portion 322 abuts against the wall of the shell 11 where the explosion-proof valve 6 is set, so that a second exhaust channel 303 connected to the air passage 301 is defined between the second side 312 of the frame body 31 and the wall of the shell 11, thereby increasing the space occupied by the exhaust path, improving the exhaust capacity, reducing the risk of combustion and explosion of the battery cell 10, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0146] Please refer again Fig.12 and Fig.13 A second extension portion 332 is also protruded from the second side 312 of the frame body 31 . The second extension portion 332 is spaced apart from the second abutting portion 322 . The second extension portion 332 and the second abutting portion 322 together form a second guide channel 305 . The second guide channel 305 connects at least one air passage 301 and the second exhaust channel 303 .

[0147] On the one hand, the second guide channel 305 can increase the space occupied by the exhaust path, which is conducive to improving the exhaust capacity. On the other hand, it can play a guiding role. A part of the gas passing through the bracket 3 from the gas passage 301 can flow along the second guide channel 305 to the second exhaust channel 303, and finally can be discharged from the explosion-proof valve 6 to achieve pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. In addition, the second guide channel 305 can guide the flow of electrolyte, further shorten the infiltration time, and greatly improve the infiltration efficiency.

[0148] In the length direction of the battery cell 10 , there are multiple gas-passing holes 315 on both sides of the exhaust hole 313 , and the multiple gas-passing holes 315 on the same side share one second guide channel 305 .

[0149] That is to say, the multiple air gaps 315 can be divided into two parts, and the two parts of the air gaps 315 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. Correspondingly, the number of the second guide channels 305 is two, and the two second guide channels 305 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. In the length direction of the battery cell 10, the second guide channel 305 located on one side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding position, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding position, and the second guide channel 305 located on the other side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding position, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding position.

[0150] When the battery cell 10 tends to experience thermal runaway, the generated gas can first enter the first exhaust channel 302, a portion of the gas can pass through the bracket 3 through the exhaust hole 313 and flow to the second side 312 of the bracket body 31, and another portion of the gas can pass through the bracket 3 through multiple gas passages 301 and flow to the second side 312 of the bracket body 31, and then flow along the second guide channel 305, and finally converge in the second exhaust channel 303, and be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0151] When injecting liquid, the electrolyte can flow along the second guide channel 305 to the multiple gas holes 315. The electrolyte passing through the gas holes 315 can first flow along the second guide channel 305 and then flow toward the electrode assembly 2, or flow directly toward the electrode assembly 2, thereby shortening the electrolyte infiltration time and improving the infiltration efficiency.

[0152] In the above technical solution, the gas passing through the bracket 3 can flow to the second exhaust channel 303 located in the middle under the guidance of the second guide channel 305, and can finally be discharged from the explosion-proof valve 6 to achieve the final pressure relief, further reduce the risk of combustion and explosion of the battery cell 10, and improve the reliability and stability of the battery 100. The electrolyte can flow to the multiple gas-passing gaps 315 under the guidance of the second guide channel 305, shortening the infiltration time and improving the infiltration efficiency.

[0153] Please refer again Fig.13 The second side 312 of the frame body 31 has a mounting recess 316, which is recessed toward the first side 311. A second exhaust channel 303 is defined between the mounting recess 316 and the wall of the shell 11 where the explosion-proof valve 6 is set, and the exhaust hole 313 is set on the bottom wall of the mounting recess 316.

[0154] The mounting recess 316 refers to a groove that is recessed relative to the surface of the second side 312 of the frame body 31 , and the bottom wall of the mounting recess 316 is lower than the surface of the second side 312 of the frame body 31 , so that the surface where the exhaust hole 313 is located is lower than the surface of the second side 312 of the frame body 31 .

[0155] In the above technical solution, by setting a mounting recess 316 on the second side 312 of the frame body 31, the distance between the wall of the shell 11 where the explosion-proof valve 6 is set and the exhaust hole 313 can be increased, thereby increasing the space occupied by the exhaust path, improving the exhaust capacity, further reducing the risk of combustion and explosion of the battery cell 10, and reducing the impact on adjacent battery cells 10, which is beneficial to improving the reliability and stability of the battery 100.

[0156] Among them, the side wall of the mounting recess 316 is provided with an air hole 317, which connects the second guide channel 305 and the second exhaust channel 303. The gas in the second guide channel 305 can flow to the second exhaust channel 303 through the air hole 317, and can finally be discharged from the explosion-proof valve 6 to achieve pressure relief, thereby reducing the risk of combustion and explosion of the battery cell 10 and reducing the impact on adjacent battery cells 10, which is beneficial to improving the reliability and stability of the battery 100.

[0157] In some embodiments, the second side 312 of the frame body 31 is further provided with a weight-reducing groove 319, which can not only reduce the weight of the bracket 3, but also further increase the occupied space of the exhaust path, improve the exhaust capacity, and improve the space utilization.

[0158] Please refer again Fig.12 and Fig.13 The second abutting portion 322 is arranged in an arc shape, so that the second abutting portion 322 and the second extending portion 332 define an arc-shaped second guide channel 305 .

[0159] There are two second abutting portions 322, and the two second abutting portions 322 are respectively located on both sides of the exhaust hole 313. By way of example, the two first abutting portions 321 are respectively formed into arc-shaped plates, and the two ends of each arc-shaped plate are arranged at intervals and are arranged opposite to the exhaust hole 313. By way of another example, the two first abutting portions 321 are respectively formed into closed annular plates.

[0160] Among them, multiple air notches 315 located on the same side of the exhaust hole 313 are arranged at circumferential intervals around the corresponding second abutment portion 322, so that the multiple air notches 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding second guide channel 305, so that the multiple air channels 301 are all connected to the same second guide channel 305, and the gas flowing out of the multiple air channels 301 is guided by the second guide channel 305 and converges in the second exhaust channel 303, and can finally be discharged from the explosion-proof valve 6.

[0161] Therefore, in the above technical solution, the second abutment portion 322 is arranged in an arc shape, and the plurality of air-passing notches 315 located on the same side of the exhaust hole 313 are arranged at intervals around the corresponding second abutment portion 322 in the circumferential direction, so that the second guide channel 305 arranged in an arc shape can be defined, the occupied space of the second guide channel 305 is increased, the space utilization rate of the bracket 3 is improved, and the exhaust capacity can be further improved. In addition, the infiltration time can be further shortened and the infiltration efficiency can be improved.

[0162] Please refer again Figure 3-Figure 5 The pole 12 includes a first pole 121, which is arranged on the wall opposite to the shell body 111 and the shell cover 112. The first insulating portion 42 is provided with an avoidance hole 422, which is used for the conductive portion 22 to pass through so that the conductive portion 22 can be connected to the first pole 121.

[0163] In the above technical solution, by providing the avoidance hole 422 on the first insulating part 42, the first insulating part 42 can avoid the conductive part 22, which can reduce the damage of the conductive part 22 by the first insulating part 42 on one hand, and facilitate the electrical connection between the conductive part 22 and the first pole 121 on the shell 11 on the other hand. In addition, when the electrolyte is injected into the shell 11, the electrolyte can enter the electrode assembly 2 through the avoidance hole 422 to accelerate the infiltration speed of the electrolyte.

[0164] As an optional solution, the pole 12 includes two first poles 121 with opposite polarities, and two avoidance holes 422 are provided on the first insulating portion 42. One of the first poles 121 is a positive pole and the other first pole 121 is a negative pole.

[0165] That is to say, the two first poles 121 are arranged on the same side of the shell 11, and the two first poles 121 can be electrically connected to the conductive parts 22 at the two avoidance holes 422 on the first insulating part 42 respectively, which makes the connection more convenient and helps to improve the assembly efficiency of the battery cell 10.

[0166] Please refer to 3 and Figure 4 The pole 12 has a through hole 12130, which connects the inner and outer spaces of the shell 11. The conductive part 22 can pass through the avoidance hole 422 of the first insulating part 42, the bracket 3, and the through hole 12130 of the pole 12 in sequence, and the conductive part 22 is connected to the pole 12.

[0167] A groove is provided on one side of the pole 12 away from the active material coating portion 21 , and the through hole 12130 passes through the bottom wall of the groove. The battery cell 10 may further include a groove cover 7 , which is provided on the pole 12 and covers the notch of the groove.

[0168] In the above technical solution, by setting the slot cover 7 for sealing the groove, the pole 12 can be indirectly electrically connected to the busbar component through the slot cover 7. The position and structure of the slot cover 7 can be adjusted to make the electrical connection between the slot cover 7 and the busbar component more convenient and the electrical connection area larger.

[0169] Please refer again Figure 5-Figure 7 , and further refer to Fig.14 and Fig.15 , Fig.14 A schematic diagram of the structure of the electrode assembly 2, the insulating member 4, and the protective member 5 of the battery 100 provided in some embodiments of the present application; Fig.15 for Fig.14 The main body insulating part 41 includes a plurality of main body parts 410, which are connected end to end in a ring shape, and the plurality of main body parts 410 are wrapped around the circumference of the active material coating part 21, and any two adjacent main body parts 410 are connected, and the first insulating part 42 and the second insulating part 43 are respectively located at the axial ends of the ring structure formed by the plurality of main body parts 410.

[0170] Specifically, the number of the main body parts 410 can be two, three or more than three, which can be selected according to the shape of the active material coating part 21. For example, the number of the main body parts 410 and the number of the surfaces on the peripheral side of the active material coating part 21 can be set in a one-to-one correspondence, that is, multiple main body parts 410 cover multiple surfaces on the peripheral side of the active material coating part in a one-to-one correspondence. For another example, the number of main body parts 410 can be less than the number of surfaces on the peripheral side of the active material coating part 21, that is, when the insulating part 4 is in the unfolded state, the surface area of ​​at least one main body part 410 is greater than the surface area of ​​one surface on the peripheral side of the active material coating part 21, so that the main body part 410 can be used to cover two or more surfaces on the peripheral side of the active material coating part 21. For another example, the number of main body parts 410 can be more than the number of surfaces on the peripheral side of the active material coating part 21, so that at least a portion of the multiple main body parts 410 can be overlapped.

[0171] After being connected, multiple main body parts 410 are in a ring shape, which can completely wrap the circumference of the active material coating part 21, so that the circumference of the active material coating part 21 is completely separated from the inner wall of the shell 11. The first insulating part 42 and the second insulating part 43 wrap the axial ends of the active material coating part 21, so that the axial ends of the active material coating part are completely separated from the axial ends of the shell 11, reducing the risk of leakage of the active material coating part 21 and improving the reliability and stability of the battery cell 10.

[0172] Among them, any two adjacent main body parts 410 are connected by a first tape (not shown in the figure). The connection method of the first tape is used instead of the hot melt connection method. On the one hand, hot fuses can be saved and material costs can be reduced. On the other hand, no hot melt connection equipment and other structures are required, which can simplify the connection steps and further reduce production costs.

[0173] As an optional solution, in the embodiment of the present application, the connection positions of any two adjacent main bodies 410 are partially overlapped. In the above technical solution, on the one hand, the connection positions of the main bodies 410 are overlapped, which is beneficial to the connection of the two adjacent main bodies 410. For example, it is beneficial to connect the two adjacent main bodies 410 with the first tape, so that the connection position is not easy to separate or disconnect, which can reduce the probability and risk of insulation failure at the overlapping position of the two, and improve the reliability of the electrode assembly 2, so as to improve the stability and reliability of the battery cell 10; on the other hand, the connection positions of the main bodies 410 are overlapped, which can fully ensure that the entire insulating member 4 can be wrapped around the circumference of the active material coating part 21, fully reduce the bare leakage of the active material coating part 21, and reduce the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0174] Optionally, the peripheral side of the active material coating portion 21 has multiple surfaces; please refer again to Fig. 9Each main body portion 410 includes a main body surface and two flanges, the two flanges are arranged on both sides of the main body surface, and any two adjacent main body portions 410 are connected by the flanges. The connection structure of each main body surface and each two flanges respectively wraps different surfaces of the peripheral side of the active material coating portion 21.

[0175] Specifically, the peripheral side of the active material coating part 21 may have four surfaces, six surfaces, or more surfaces. In the embodiment where the peripheral side of the active material coating part 21 has four surfaces, the number of the main body parts 410 may be two, and the main surfaces of the two main body parts 410 may cover the two oppositely disposed surfaces of the active material coating part 21. The same side flanges of the two main body parts 410 are connected together to cover the other surface of the active material coating part 21.

[0176] In the embodiment in which the circumferential side of the active material coating portion 21 has six surfaces, for the convenience of description, the circumferential side of the active material coating portion 21 can be defined as having three first surfaces and three second surfaces, and the three first surfaces and the three second surfaces are alternately arranged in the circumferential direction of the active material coating portion, that is, a second surface is provided between two adjacent first surfaces, and a first surface is provided between two adjacent second surfaces. Correspondingly, the number of main body portions 410 can be three, and the main body surfaces of the three main body portions 410 can respectively cover the three spaced-apart first surfaces of the active material coating portion 21, and the flanges of two adjacent main body portions 410 are connected together to cover the second surface of the active material coating portion 21.

[0177] In the above technical solution, on the one hand, any two adjacent main body parts 410 can ensure the reliability of the connection through the flange connection, so as to improve the reliability and stability of the electrode assembly 2 and the battery cell 10; on the other hand, the main body surface and the connection position of each two flanges respectively wrap different surfaces of the peripheral side of the active material coating part 21, so that each surface of the peripheral side of the active material coating part 21 can be effectively wrapped, which can further improve the reliability of the electrode assembly 2 and improve the stability and reliability of the battery cell 10.

[0178] Please refer again Figure 5 , Figure 14-15 The active material coating portion 21 has four surfaces on its circumferential side, that is, the cross-sectional outer contour of the active material coating portion 21 is a quadrilateral.

[0179] The main insulating portion 41 includes two main portions 410, and the two main portions 410 are arranged on both sides of the first insulating portion 42. The two main portions 410 are respectively a first main portion 411 and a second main portion 412. The first main portion 411 includes a first main surface 4111, a first flange 4112 and a second flange 4113. The first flange 4112 and the second flange 4113 are arranged on both sides of the first main surface 4111. The second main portion 412 includes a second main surface 4121, a third flange 4122 and a fourth flange 4123. The third flange 4122 and the fourth flange 4123 are arranged on both sides of the second main surface 4121. The first flange 4112 is connected to the third flange 4122, and the second flange 4113 is connected to the fourth flange 4123.

[0180] Among them, the first main surface 4111, the connection structure of the first flange 4112 and the third flange 4122, and the connection structure of the second main surface 4121, the second flange 4113 and the fourth flange 4123 respectively wrap the four surfaces arranged in sequence on the peripheral side of the active material coating part 21.

[0181] In an embodiment of the present application, the circumferential side of the active material coating portion 21 has four surfaces, namely, two relatively large surfaces and two relatively small surfaces. The first main surface 4111 and the second main surface 4121 respectively cover the two relatively large surfaces on the circumferential side of the active material coating portion 21. The first flange 4112 and the third flange 4122 are connected and cover a small surface on the circumferential side of the active material coating portion 21. The second flange 4113 and the fourth flange 4123 are connected and cover another small surface on the circumferential side of the active material coating portion 21. The first insulating portion 42 covers the end of the active material coating portion 21 facing away from the opening 1110, and the second insulating portion 43 covers the end of the active material coating portion 21 close to the opening 1110.

[0182] When the peripheral side of the active material coating part 21 has four surfaces, the battery cell 10 is roughly square. At this time, the first main body 411 and the second main body 412, as well as their connection structure can completely cover the four peripheral sides of the active material coating part 21, so that the four peripheral sides of the active material coating part 21 are completely separated from the inner wall of the shell 11, reducing the risk of leakage of the active material coating part 21, and fully improving the reliability and stability of the square battery cell 10.

[0183] In some embodiments, the first flange 4112 and the third flange 4122 partially overlap, and the first flange 4112 and the third flange 4122 are connected by a first tape, the middle of the first tape is bonded to the outside of the first flange 4112 and the third flange 4122, and the two ends of the first tape are bonded to the outside of the first main body surface 4111 and the second main body surface 4121. The second flange 4113 and the fourth flange 4123 partially overlap, and the second flange 4113 and the fourth flange 4123 are connected by a first tape, the middle of the first tape is bonded to the outside of the second flange 4113 and the fourth flange 4123, and the two ends of the first tape are bonded to the outside of the first main body surface 4111 and the second main body surface 4121.

[0184] In the above technical solution, one of the first adhesive tapes can connect the first main body surface 4111, the second main body surface 4121, the first flange 4112 and the third flange 4122 together, and the other first adhesive tape can connect the first main body surface 4111, the second main body surface 4121, the second flange 4113 and the fourth flange 4123 together. On the one hand, the first main body 411 and the second main body 412 can be shaped so that the first main body 411 and the second main body 412 can be kept in a folded state that fits the circumference of the active material coating part 21. On the other hand, the connection area between the first adhesive tape and the first main body 411 and the second main body 412 is increased, and the connection reliability between the two is improved. It can fully ensure that the first main body 411 and the second main body 412 can be wrapped around the circumference of the active material coating part 21, fully reduce the bare leakage of the active material coating part 21, and reduce the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0185] Please refer again Figure 14-15 The second insulating portion 43 includes a plurality of insulating sub-portions 430 , and the plurality of insulating sub-portions 430 are connected to the main body surfaces of the plurality of main body portions 410 in a one-to-one correspondence, and any two adjacent insulating sub-portions 430 are connected.

[0186] Specifically, when the insulating member 4 completely covers the electrode assembly 2 , the multiple insulating sections 430 of the second insulating portion 43 are located on the wall of the active material coating portion 21 away from the conductive portion 22 , effectively reducing the corrosion of the shell 11 due to the exposure of the active material coating portion 21 .

[0187] When the electrode assembly 2 is installed into the shell 11, the first insulating part 42 enters the shell 11 first, and the second insulating part 43 enters the shell 11 last. During this process, the insulating part 4 can enter the shell 11 along the shell entry direction, and the shell 11 will not scratch the edge of the insulating part 4, thereby reducing the movement and slippage of the insulating part 4.

[0188] In some embodiments, any two adjacent insulating sections 430 are connected by a second tape (not shown in the figure). The second tape is used instead of the hot melt connection method. On the one hand, hot fuses can be saved and material costs can be reduced. On the other hand, there is no need for hot melt connection equipment and other structures, which can simplify the connection steps and further reduce production costs.

[0189] Part of the second adhesive tape is bonded to the outer sides of two adjacent insulating sections 430 , and another part of the second adhesive tape is bonded to the outer sides of two adjacent flanges.

[0190] In the above technical solution, the second tape can connect two adjacent insulating sections 430 and two adjacent flanges together. On the one hand, the two adjacent main bodies 410 and the second insulating parts 43 can be shaped, so that the two main bodies 410 and the second insulating parts 43 can be better maintained in a folded state that fits the active material coating part 21. On the other hand, the connection area between the second tape and the two adjacent main bodies 410 and the second insulating parts 43 is increased, and the connection reliability is improved. It can fully ensure that the two adjacent main bodies 410 and the second insulating parts 43 can wrap the active material coating part 21, fully reduce the bare leakage of the active material coating part 21, and reduce the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0191] In some embodiments, any two adjacent insulating sections 430 have partial overlap, making it difficult to separate the two adjacent insulating sections 430, which can reduce the probability and risk of insulation failure at the overlapping position of the two, fully reduce the leakage of the active material coating portion 21, and reduce the risk of corrosion of the shell 11, thereby improving the reliability of the electrode assembly 2 and improving the stability and reliability of the battery cell 10.

[0192] As an optional solution, the widths of two adjacent insulating sections 430 are unequal, and the insulating section 430 with a smaller width is located outside the insulating section 430 with a larger width.

[0193] Such a configuration facilitates the use of the second tape to connect two adjacent insulating sections 430 in the second insulating section 43, so that the connection positions of the two adjacent insulating sections 430 are not easily separated or disconnected, which can reduce the probability and risk of insulation failure at the overlapping positions of the two, and can improve the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0194] Optionally, in two adjacent insulating sections 430, chamfered structures are formed at both ends of the insulating section 430 located on the outside, so that the insulating section 430 located on the inside can expose more area, thereby increasing the connection area between the second tape and the insulating section 430 located on the inside, which can further reduce the probability and risk of insulation failure at the overlapping position of the two, and is more conducive to improving the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0195] Among the two adjacent flanges, a chamfered structure is formed at one end located on the outside and close to the insulating section 430, that is, a chamfered structure is formed at one end of the flange located on the outside and close to the insulating section 430, so that the flange located on the inside can expose more area, thereby increasing the connection area between the second tape and the flange located on the inside, which can further reduce the probability and risk of insulation failure at the overlapping position of the two, and is more conducive to improving the reliability of the electrode assembly 2, so as to improve the stability and reliability of the battery cell 10.

[0196] Please refer again Figure 14-15 , a notch 401 is formed at a connection position between the main surface of each main body portion 410 and the flange; and / or a notch 401 is formed at a connection position between the insulating portion 430 and the corresponding main surface.

[0197] Among them, the notch 401 serves as a boundary structure between two adjacent structures. After the insulating part 4 is manufactured, it can be pressed by a notching machine or other equipment to reduce the thickness of the insulating part 4 at the notch 401. It can also be preformed during the manufacturing process of the insulating part 4.

[0198] In the above technical solution, on the one hand, by setting the notch 401, the insulating part 4 can be easily folded to smoothly wrap the active material coating part 21, which is beneficial to improving production and manufacturing efficiency and saving production and manufacturing costs; on the other hand, such a setting can reduce the error in the process of coating the insulating part 4 to the active material coating part 21, and can improve the accuracy and reliability of the coating of the insulating part 4, so as to further improve the stability and reliability of the battery cell 10.

[0199] In some embodiments, a connection position between the main insulating portion 41 and the first insulating portion 42 has a notch 401 ; and / or a connection position between the main insulating portion 41 and the second insulating portion 43 has a notch 401 .

[0200] In the above technical solution, on the one hand, by setting the notch 401, the insulating part 4 can be easily folded to smoothly wrap the active material coating part 21, which is beneficial to improving production and manufacturing efficiency and saving production and manufacturing costs; on the other hand, such a setting can reduce the error in the process of coating the insulating part 4 to the active material coating part 21, and can improve the accuracy and reliability of the coating of the insulating part 4, so as to further improve the stability and reliability of the battery cell 10.

[0201] Please refer again Figure 14-15 In the present embodiment, the notch 401 includes a first notch 401a, a second notch 401b and a third notch 401c. The first notch 401a is the connection position between the main surface of each main body 410 of the main insulating part 41 and the first insulating part 42, the second notch 401b is the connection position between each main body 410 of the main insulating part 41 and the flange, and the third notch 401c is the connection position between the main surface of each main body 410 of the main insulating part 41 and the insulating sub-part 430 of the second insulating part 43.

[0202] Taking the shape of the electrode assembly 2 as a roughly rectangular parallelepiped as an example, the X direction in the figure is the length direction of the electrode assembly 2, the Y direction is the thickness direction of the electrode assembly 2, and the Z direction is the height direction of the electrode assembly 2. The peripheral side of the active material coating portion 21 has four surfaces, namely, two large surfaces arranged oppositely and two small surfaces arranged oppositely.

[0203] When the insulating member 4 is used to wrap the electrode assembly 2, the first insulating portion 42 of the insulating member 4 can first be covered on the end of the active material coating portion 21 provided on the conductive portion 22, and then the first main body portion 411 and the second main body portion 412 of the insulating member 4 are bent respectively according to the first notch 401a, so that the first main surface 4111 of the first main body portion 411 and the second main surface 4121 of the second main body portion 412 respectively cover the two relatively large surfaces of the active material coating portion 21, and then the first flange 4112, the second flange 4113, the third flange 4122 and the fourth flange 4123 are bent respectively according to the second notch 401b, and a first adhesive tape is used to connect the end of the first flange 4112 of the first main body portion 411 close to the first insulating portion 42 and the end of the third flange 4122 of the second main body portion 412 close to the first insulating portion 42, so that the first flange 4112 is connected to the conductive portion 22 of the second main body portion 412. The edge 4112 and the third flange 4122 cover a small face of the active material coating part 21, and another first adhesive tape is used to connect the end of the second flange 4113 of the first main body 411 close to the first insulating part 42 and the end of the fourth flange 4123 of the second main body 412 close to the first insulating part 42, and the second flange 4113 and the fourth flange 4123 cover another small face of the active material coating part 21; and then, the two insulating subsections 430 of the second insulating part 43 are bent according to the third notch 401c, and the ends of the first flange 4112 and the third flange 4122 close to the second insulating part 43 are connected to the two insulating subsections 430, and another second adhesive tape is used to connect the ends of the second flange 4113 and the fourth flange 4123 close to the second insulating part 43 to the two insulating subsections 430. The entire insulating member 4 is bent multiple times according to the notch 401 to cover the active material coating part 21.

[0204] Please refer to 4- Fig. 9 The bracket 3 is provided with a through hole 314 exposing the first pole 121, the through hole 314 is arranged opposite to the avoidance hole 422, the pole 12 is provided with a receiving portion connected to the through hole 314, at least part of the conductive portion 22 passes through the avoidance hole 422 and the through hole 314 and then extends into the receiving portion and is connected to the pole 12. That is, the pole 12 is arranged as a hollow structure.

[0205] Among them, at least part means that the conductive part 22 can be completely accommodated in the accommodating part, or part of the conductive part 22 can be accommodated in the accommodating part. Since the pole 12 is provided with an accommodating part, the hollow structure of the accommodating part can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100. On the other hand, the conductive part 22 can be accommodated in the accommodating part, which improves the assembly efficiency of the conductive part 22, saves the space occupied by the conductive part 22, and makes full use of the space of the battery cell 10, so that the cooperation between the bracket 3 and the pole 12, and between the bracket 3 and the conductive part 22 are tighter and more reliable, so that the structure of the battery cell 10 is more compact, which is more conducive to the improvement of the energy density of the battery cell 10.

[0206] More specifically, part or all of the conductive part 22 is contained in the containing part, so that the part of the conductive part 22 located in the containing part can occupy the space in the pole 12, which can reduce the space occupied by the conductive part 22 in the shell 11. When the size of the shell 11 is fixed, some space can be saved in the shell 11 to accommodate a larger active material coating part 21, thereby improving the volume energy density of the battery cell 10. For example, when the conductive part 22 is led out from the side of the active material coating part 21 close to the pole 12, the space occupied by the conductive part 22 between the active material coating part 21 and the pole 12 can be saved, the size of the active material coating part 21 in the direction of leading out the conductive part 22 can be increased, the distance between the active material coating part 21 and the pole 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0207] At the same time, by accommodating at least part of the conductive part 22 in the accommodating part, the space occupied by the battery cell 10 itself can be reduced, so that the battery 100 of the same volume can accommodate a larger number of battery cells 10, and the volume energy density of the battery 100 can be improved; in addition, accommodating at least part of the conductive part 22 in the accommodating part to occupy the space in the pole 12 can reduce the redundancy of the conductive part 22 in the shell 11 to at least a certain extent, reduce the probability of short circuit between the conductive part 22 and the active material coating part 21, reduce the probability of short circuit of the battery cell 10, and improve the working reliability and stability of the battery cell 10 and the battery 100.

[0208] It should be noted that, in the embodiment of the present application, the accommodation portion may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 away from the active material coating portion 21 .

[0209] Please refer again Fig. 9 The shell body 111 is provided with a first mounting hole 113, an upper plastic 117 and a lower plastic 118, the pole 12 is provided at the first mounting hole 113, the upper plastic 117 is provided around the first mounting hole 113 and is at least partially located outside the shell body 111, the upper plastic 117 is sleeved on the outer side of the pole 12 and is at least partially located between the hole wall of the first mounting hole 113 and the pole 12, the lower plastic 118 is provided around the first mounting hole 113 and is at least partially located inside the shell body 111, the lower plastic 118 is sleeved on the outer side of the pole 12 and is at least partially located between the hole wall of the first mounting hole 113 and the pole 12, thereby improving the sealing performance of the matching between the pole 12 and the shell body 11.

[0210] Please refer again Figure 3-Figure 4 , Figure 7 There are multiple poles 12, at least one of which is a first pole 121. The conductive battery cell 10 also includes a bracket 3, which is arranged in the shell body 111 and between the first pole 121 and the active material coating portion 21. The bracket 3 has a through hole 314, and the first conductive portion 221 can be exposed from the through hole 314, so as to facilitate the connection between the first conductive portion 221 and the first pole 121.

[0211] As an optional solution, the pole 12 includes two first poles 121, and the bracket 3 is provided with two through holes 314. In the process of installing the electrode assembly 2 into the housing 11, the two conductive parts 22 of the electrode assembly 2 can pass through the two through holes 314 of the bracket 3 at the same time, one by one, so that the conductive parts 22 are conveniently electrically connected to the corresponding first poles 121, and the connection is more convenient, which is conducive to improving the assembly efficiency of the battery cell 10.

[0212] Please refer again Figure 5 , Fig.14 and Fig.15 The battery cell 10 further includes a protection member 5 , which is disposed on at least one side of the circumference of the first insulating portion 42 and is stacked on the outer side of the main insulating portion 41 .

[0213] Before the electrode assembly 2 wrapped with the insulating part 4 is installed into the shell 11, the protective part 5 can be arranged obliquely relative to the insulating part 4. In the process of installing the electrode assembly 2 into the shell 11, the first insulating part 42 enters the shell 11 before other structures of the insulating part 4, and the protective part 5 can enter the shell 11 along the shell entry direction, play a role in guiding and protecting the insulating part 4, reduce the scratching of the insulating part 4 by the shell 11, and reduce the movement and sliding of the insulating part 4. After the electrode assembly 2 is installed in place in the shell 11, the protective part 5 is located between the shell 11 and the main insulating part 41 of the insulating part 4, further reducing the phenomenon of corrosion of the shell 11 by the active material coating part 21 due to leakage.

[0214] In the above technical scheme, by arranging a protective member 5 on at least one side of the circumferential side of the first insulating part 42, on the one hand, the protective member 5 can play a guiding role in the process of the electrode assembly 2 being installed into the shell 11, so as to facilitate the installation of the electrode assembly 2 into the shell 11, and can also protect the insulating member 4, thereby reducing the probability of the shell 11 scratching the insulating member 4, and reducing the movement and sliding of the insulating member 4. On the other hand, after the electrode assembly 2 is installed into the shell 11, the protective member 5 is located between a part of the insulating member 4 and the shell 11, which can further isolate the active material coating part 21 from the shell 11, and cooperate with the insulating member 4 to achieve double insulation, thereby fully reducing the bare leakage of the active material coating part 21 and reducing the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0215] Among them, the protective member 5 includes one; or, the protective member 5 includes multiple, and the multiple protective members 5 are arranged along the circumference of the first insulating part 42. For example, the number of protective members 5 can be two and the two protective members 5 are arranged on the opposite sides of the first insulating part 42. For example, the number of protective members 5 can be three and the three protective members 5 are arranged on the circumferential side of the first insulating part 42.

[0216] In the above technical solution, multiple protective members 5 are provided to guide the electrode assembly 2 into the shell and protect the insulating member 4 in the circumferential direction of the electrode assembly 2, which is beneficial to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0217] According to some embodiments of the present application, the present application further provides a battery 100 including any of the above battery cells 10. In the technical solution of the embodiment of the present application, by using the above battery cells 10, the reliability and stability of the battery 100 can be improved.

[0218] According to some embodiments of the present application, the present application further provides an electric device 1000 including the battery 100 of the above solution, and the battery 100 is used to provide power to the electric device 1000. The electric device 1000 may be any of the aforementioned devices or systems using the battery 100.

[0219] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell 10 or battery 100, the reliability and stability of the electric device 1000 can be improved.

[0220] 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: The shell comprises a shell cover and a shell body with an opening, wherein the shell cover covers the opening, and a pole is provided on the shell; An electrode assembly, comprising a conductive portion and an active material coating portion disposed in the shell, wherein the conductive portion electrically connects the active material coating portion and the electrode column; A bracket, disposed in the shell body and located at an end of the active material coating portion away from the shell cover; The insulating part includes a main insulating part, a first insulating part and a second insulating part. The main insulating part is arranged on the peripheral side of the active material coating part, the first insulating part is arranged between the bracket and an end of the active material coating part away from the shell cover, and the second insulating part is arranged at an end of the active material coating part close to the shell cover.

2. The battery cell according to claim 1, characterized in that: A plurality of fluid passage holes arranged at intervals are provided on the main body insulating part at a position close to the second insulating part.

3. The battery cell according to claim 2, characterized in that: The plurality of liquid through holes are arranged at intervals in the length direction of the main insulating portion.

4. The battery cell according to claim 2, characterized in that: The distance between the liquid through hole and the second insulating part is 1 mm-8 mm.

5. The battery cell according to claim 4, characterized in that: The distance between the liquid through hole and the second insulating part is 3mm-5mm.

6. The battery cell according to claim 2, characterized in that: The diameter of the liquid through hole is 0.5mm-1mm.

7. The battery cell according to claim 2, characterized in that: The main insulating part includes multiple main parts; the multiple main parts are connected end to end in a ring shape, the multiple main parts are wrapped together on the circumference of the active material coating part and any two adjacent main parts are connected, the liquid holes are arranged in the main parts and the number of the liquid holes on each main part is greater than or equal to 3.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The shell is provided with an explosion-proof valve, and the insulating member has a vent hole corresponding to the position of the explosion-proof valve.

9. The battery cell according to claim 8, characterized in that: The explosion-proof valve is located on the wall of the shell body opposite to the bracket, the air vent is arranged in the first insulating part, and the bracket has an exhaust hole corresponding to the position of the explosion-proof valve.

10. The battery cell according to claim 9, characterized in that: The number of the ventilation hole is one; or, the number of the ventilation holes is multiple and the multiple ventilation holes are arranged at intervals in the length direction of the first insulating part.

11. The battery cell according to claim 9, characterized in that: The number of the exhaust hole is one; or, the number of the exhaust holes is multiple and the multiple exhaust holes are arranged at intervals in the length direction and / or width direction of the bracket.

12. The battery cell according to claim 9, characterized in that: The support comprises: A frame body, the frame body having a first side and a second side oppositely arranged in a thickness direction thereof, the exhaust hole penetrating the first side and the second side; The first abutment portion is disposed on the first side and protrudes in a direction away from the second side, and is used to abut against an end of the active material coating portion away from the shell cover, so that a first exhaust channel is formed between the exhaust hole and the active material coating portion.

13. The battery cell according to claim 12, characterized in that: The bracket is provided with a gas notch penetrating the first side and the second side in the circumferential direction, and the gas notch and the shell together form a gas passage, and the gas passage is communicated with the first exhaust passage.

14. The battery cell according to claim 13, characterized in that: The bracket is provided with a plurality of air-passing notches arranged at intervals in the circumferential direction, each of the air-passing notches and the shell together form an air-passing channel, and the plurality of air-passing channels are arranged around the circumference of the first exhaust channel.

15. The battery cell according to claim 13, characterized in that: A first extension portion is also protruded from the first side of the frame body. The first extension portion is arranged around the circumference of the frame body and defines a matching groove with the frame body. One end of the active material coating portion away from the shell cover is arranged in the matching groove.

16. The battery cell according to claim 15, characterized in that: The air passage notch is disposed through the first extension portion and the frame body.

17. The battery cell according to claim 15, characterized in that: The first extension portion and the first abutment portion are spaced apart to form a first flow guiding channel together, and the first flow guiding channel is connected to at least one of the air passages and the first exhaust channel.

18. The battery cell according to any one of claims 13 to 17, characterized in that: A second abutment portion is provided on the second side of the frame body and protrudes in a direction away from the first side. The second abutment portion is used to abut against the wall of the shell on which the explosion-proof valve is arranged, and together form a second exhaust channel; the second exhaust channel is connected to at least one of the air passages.

19. The battery cell according to claim 18, characterized in that: A second extension portion is also protruded from the second side of the frame body. The second extension portion and the second abutment portion are spaced apart to form a second flow guiding channel. The second flow guiding channel is connected to at least one of the air passages and the second exhaust channel.

20. The battery cell according to claim 19, characterized in that: In the length direction of the battery cell, the number of the gas-passing notches on both sides of the exhaust hole is multiple, and the multiple gas-passing notches on the same side share one second guide channel.

21. The battery cell according to any one of claims 1 to 20, characterized in that: The pole comprises a first pole, which is arranged on a wall of the shell body opposite to the shell cover, and a avoidance hole is opened on the first insulating part, and the avoidance hole is used for the conductive part to pass through so that the conductive part can be connected to the first pole.

22. The battery cell according to claim 21, characterized in that: The pole comprises two first poles with opposite polarities, and the first insulating portion is provided with two avoidance holes.

23. The battery cell according to claim 21, characterized in that: The main insulating part includes multiple main parts; the multiple main parts are connected end to end in sequence to form a ring shape, the multiple main parts are commonly wrapped around the circumference of the active material coating part and any two adjacent main parts are connected, and the first insulating part and the second insulating part are respectively located at the axial ends of the ring structure formed by the multiple main parts.

24. The battery cell according to claim 23, characterized in that: The connection positions of any two adjacent main bodies are partially overlapped.

25. The battery cell according to claim 23, characterized in that: The peripheral side of the active material coating portion has a plurality of surfaces; Each of the main body parts includes a main body surface and two flanges arranged on both sides of the main body surface, any two adjacent main body parts are connected by the flanges, and the connection structure of each main body surface and every two flanges respectively wraps different surfaces of the peripheral side of the active material coating part.

26. The battery cell according to claim 25, characterized in that: The peripheral side of the active material coating portion has four surfaces; The main body insulating part includes two main bodies arranged on both sides of the first insulating part, namely a first main body and a second main body, the first main body includes a first main body surface and a first flange and a second flange arranged on both sides of the first main body surface, the second main body includes a second main body surface and a third flange and a fourth flange arranged on both sides of the second main body surface, the first flange is connected to the third flange, and the second flange is connected to the fourth flange; The first main body surface, the connection structure of the first flange and the third flange, the second main body surface, and the connection structure of the second flange and the fourth flange respectively wrap four surfaces sequentially arranged on the peripheral side of the active material coating portion.

27. The battery cell according to claim 25, characterized in that: The second insulating portion includes a plurality of insulating sub-portions, the plurality of insulating sub-portions are connected to the main body surfaces of the plurality of main body portions in a one-to-one correspondence, and any two adjacent insulating sub-portions are connected.

28. The battery cell according to claim 27, characterized in that: Any two adjacent insulating sections partially overlap.

29. The battery cell according to any one of claims 21 to 28, characterized in that: The bracket is provided with a through hole exposing the first pole, the through hole is arranged opposite to the avoidance hole, the pole is provided with a receiving portion connected to the through hole, at least part of the conductive portion passes through the avoidance hole and the through hole and then extends into the receiving portion and is connected to the pole.

30. The battery cell according to any one of claims 1 to 29, characterized in that: Also includes: The protective member is disposed on at least one side of the circumference of the first insulating portion and is stacked on the outer side of the main insulating portion.

31. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 30.

32. An electrical device, characterized in that: Comprising a battery according to claim 31.

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