Battery cell, battery, and electrical apparatus

Abstract

A battery cell (10), a battery (100), and an electrical apparatus (1000). The battery cell (10) comprises: a housing (11), comprising a housing cover (112) and a housing body (111), wherein the housing (11) is provided with electrode columns (12); an electrode assembly (2), comprising a conductive portion (22) and an active substance coating portion (21), wherein the conductive portion (22) is electrically connected to the active substance coating portion (21) and the electrode columns (12); a support (3), arranged within the housing body (111) and located at the end of the active substance coating portion (21) away from the housing cover (112); an insulating piece (4), comprising a main body insulating portion (41), a first insulating portion (42) and a second insulating portion (43), wherein the main body insulating portion (41) is arranged on the peripheral side of the active substance coating portion (21), the first insulating portion (42) is arranged between the support (3) and the end of the active substance coating portion (21) away from the housing cover (112), and the second insulating portion (43) is arranged at the end of the active substance coating portion (21) close to the housing cover (112). The risk of failure and damage of the electrode assembly (2) is reduced, the risk of corrosion of the housing (11) is reduced, and the reliability and stability of the battery cell (10) are improved.

Description

Battery cells, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420118210.X and application date January 17, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sustainable development. Battery technology is a crucial factor in the development of electric vehicles. However, the reliability of battery cells remains a challenge, hindering further improvements in battery reliability.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery cell, a battery and an electrical device with higher reliability.

[0007] 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 provided in the shell, the conductive part electrically connecting the active material coating part and the pole; a bracket, provided in the shell body and located at an end of the active material coating part away from the shell cover; an insulating part, comprising a main insulating part, a first insulating part and a second insulating part, the main insulating part being provided on the peripheral side of the active material coating part, the first insulating part being provided between the bracket and the end of the active material coating part away from the shell cover, and the second insulating part being provided at an end of the active material coating part close to the shell cover.

[0008] In the technical solution of the embodiment of the present application, the insulating part is set 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 fully 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.

[0009] In some embodiments, the main insulating portion is provided with a plurality of spaced-apart liquid-through holes near the second insulating portion. The plurality of liquid-through holes can increase the fluidity of the electrolyte, increase the contact area between the electrolyte and the active material coating, and reduce the problem of poor wetting of the active material coating.

[0010] 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.

[0011] 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.

[0012] In some embodiments, the distance between the liquid through hole and the second insulating portion is 3 mm to 5 mm, which is beneficial to further improve the wetting effect of the insulating member.

[0013] 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 member may be easily broken, and if the diameter of the liquid hole is too small, the efficiency of the electrolyte infiltration may 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 member can be improved, but also the efficiency of the insulating member infiltrating the electrolyte can be improved.

[0014] 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 provided 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 in soaking the electrolyte.

[0015] 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 and the vent hole can be connected, so that the explosion-proof valve can normally exhaust and release pressure.

[0016] In some embodiments, the explosion-proof valve is located on a wall of the housing opposite the bracket, the vent is provided in the first insulating portion, and the bracket has an exhaust hole corresponding to the position of the explosion-proof valve. In the above technical solution, during the process of installing the electrode assembly wrapped with the insulating member into the housing, the first insulating portion can be moved along the direction of insertion to gradually approach the bracket until the vent aligns with the explosion-proof valve. This reduces the chance of the explosion-proof valve damaging the first insulating portion during insertion, substantially minimizes exposure of the active material coating, and reduces the risk of housing corrosion, thereby further improving the reliability and stability of the electrode assembly and battery cell.

[0017] In some embodiments, the number of the ventilation hole is one; or, the number of the ventilation holes is multiple and the multiple ventilation holes are spaced apart in the length direction of the first insulating portion, which can improve exhaust efficiency.

[0018] 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.

[0019] In some embodiments, the bracket includes: a bracket body having a first side and a second side disposed opposite each other in a thickness direction thereof, the vent extending through the first side and the second side; and a first abutting portion disposed on the first side and projecting away from the second side, configured to abut against an end of the active material coating portion remote from the shell cover, such that a first vent channel is formed between the vent and the active material coating portion. In the above technical solution, by disposing the first abutting portion on the first side of the bracket body and abutting against the end of the active material coating portion remote from the shell cover, the distance between the first side of the bracket body and the active material coating portion is increased, i.e., the distance between the vent and the active material coating portion is increased, thereby defining a first vent channel connected to the vent between the first side of the bracket body and the active material coating portion, thereby improving the venting capacity. When a battery cell is prone to thermal runaway, the generated gas can first enter the first vent channel, then pass through the bracket from the vent, 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 and reducing the impact on adjacent battery cells, thereby improving the reliability and stability of the battery.

[0020] 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 channel, and the gas channel is connected to the first exhaust channel. In the above technical solution, by providing a gas notch on the bracket, the gas notch and the shell can be used to define a gas channel. 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 channel at the corresponding position in a short time, so as to improve the timeliness of the pressure relief of the explosion-proof valve. At the same time, the gas in the first exhaust channel can flow to the exhaust hole and the gas channel 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.

[0021] In some embodiments, the bracket is provided with a plurality of spaced-apart gas passageways around its circumference, each of which forms a gas passageway with the housing. The plurality of gas passageways are arranged circumferentially around the first exhaust passageway. By providing a plurality of gas passageways, a plurality of gas passageways can be defined. A portion of the gas within the first exhaust passageway can diffuse outward, pass through the bracket through the plurality of gas passageways, and ultimately be discharged through the explosion-proof valve, significantly reducing the risk of combustion and explosion of the battery cells and greatly improving the reliability and stability of the battery. During injection, the electrolyte can flow toward the electrode assembly through the plurality of gas passageways, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0022] In some embodiments, a first extension portion is further provided protruding from the first side of the frame body. The first extension portion is disposed circumferentially around the frame body and defines a mating groove with the frame body. The end of the active material coating portion distal from the shell cover is disposed within the mating groove. In the above technical solution, the provision of the first extension portion can constrain one end of the electrode assembly, thereby improving the stability of the electrode assembly during shaking of the battery cell and reducing the probability of the outer layer of the active material coating portion of the electrode assembly becoming fluffy. It also protects one end of the electrode assembly, reducing the risk of one end of the electrode assembly contacting the shell, thereby reducing the possibility of the shell scratching the electrode assembly and improving the reliability of the battery cell.

[0023] In some embodiments, the gas passage notch is provided through the first extension portion and the frame body. The formed gas passage runs through both sides of the thickness direction of the frame to connect the first exhaust passage and the explosion-proof valve. Gas in the first exhaust passage can flow to the exhaust hole and the gas passage respectively in a short period of time, achieving 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 cells and improving the reliability and stability of the battery.

[0024] 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, achieving instantaneous pressure relief, and then pass through the bracket from multiple gas passages, and finally 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.

[0025] In some embodiments, the second side of the frame body is provided with a second abutting portion protruding in a direction away from the first side, and the second abutting portion is used to abut against the wall of the shell on which 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 the second abutting portion on the second side of the frame body, the second abutting portion abuts against the wall of the shell on which the explosion-proof valve is provided, so that a second exhaust channel connected to the gas passage is defined between the second side of the frame body and the wall of the shell, which increases the space occupied by the exhaust path, improves the exhaust capacity, reduces the risk of combustion and explosion of battery cells, reduces the impact on adjacent battery cells, and is conducive to improving the reliability and stability of the battery.

[0026] In some embodiments, a second extension portion is further provided protruding from the second side of the bracket body. The second extension portion and the second abutting portion are spaced apart to form a second guide channel. The second guide channel connects at least one of the gas passages and the second exhaust channel. The second guide channel can, on the one hand, increase the space occupied by the exhaust path, thereby improving exhaust capacity. On the other hand, it can serve as a guide. A portion of the gas that passes through the bracket from the gas passage can flow along the second guide channel to the second exhaust channel and ultimately be discharged from the explosion-proof valve to achieve pressure relief, further reducing the risk of combustion and explosion of the battery cells and improving the reliability and stability of the battery. In addition, the second guide channel can guide the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0027] In some embodiments, there are multiple gas-passing notches on both sides of the exhaust hole along the length of the battery cell, and multiple gas-passing notches on the same side share a single second flow guide channel. In the above technical solution, gas passing through the bracket can be guided by the second flow guide channel to flow toward the second exhaust channel located in the middle, and ultimately discharged from the explosion-proof valve, achieving final pressure relief, further reducing the risk of combustion and explosion of the battery cell and improving the reliability and stability of the battery. Under the guidance of the second flow guide channel, the electrolyte can flow toward the multiple gas-passing notches, shortening the infiltration time and improving the infiltration efficiency.

[0028] In some embodiments, the pole includes a first pole, the first pole is provided on the wall of the shell body opposite to the shell cover, and the first insulating portion is provided with an avoidance hole, the avoidance hole is used for the conductive portion to pass through, so that the conductive portion can be connected to the first pole. In the above technical solution, by providing the avoidance hole on the first insulating portion, the first insulating portion can be made to avoid the conductive portion, which can, on the one hand, reduce the damage to the conductive portion by the first insulating portion, and on the other hand, facilitate the electrical connection between the conductive portion and 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.

[0029] In some embodiments, the terminal includes two first terminals of opposite polarity, and the first insulating portion is provided with two avoidance holes. The two first terminals can be electrically connected to the conductive portions at the two avoidance holes on the first insulating portion, respectively, making the connection more convenient and facilitating improved assembly efficiency of the battery cells.

[0030] In some embodiments, the main body insulating portion includes multiple main body portions; the multiple main body portions are connected end to end in a ring shape, and the multiple main body portions are collectively wrapped around the circumference of the active material coating portion, and any two adjacent main body portions are connected, and the first insulating portion and the second insulating portion are respectively located at the axial ends of the ring structure formed by the multiple main body portions. After the multiple main body portions are connected, they form a ring shape, which can completely wrap around the circumference of the active material coating portion, completely isolating the circumference of the active material coating portion from the inner wall of the shell. The first insulating portion and the second insulating portion wrap around the axial ends of the active material coating portion, completely isolating the axial ends of the active material coating portion from the axial ends of the shell, reducing the risk of leakage of the active material coating portion and improving the reliability and stability of the battery cell.

[0031] In some embodiments, the connection positions of any two adjacent main bodies partially overlap. In the above technical solution, on the one hand, the connection positions of the main bodies overlap, which is beneficial to the connection of the two adjacent main bodies. For example, it is beneficial for the two adjacent main bodies to be connected using the first adhesive 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, thereby improving 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 member can be wrapped around the circumference of the active material coating part, fully reduce the exposure of the active material coating part, reduce the risk of corrosion of the shell, and further improve the reliability and stability of the electrode assembly and the battery cell.

[0032] In some embodiments, the peripheral side of the active material coating portion has multiple surfaces; each of the main body portions includes a main body surface and two flanges provided on both sides of the main body surface, and any two adjacent main body portions are connected by the flanges, and the connection structure of each main body surface and each two flanges respectively wraps around different surfaces of the peripheral side of the active material coating portion. In the above technical solution, on the one hand, the connection of any two adjacent main body portions by flanges can ensure the reliability of the connection, thereby improving the reliability and stability of the electrode assembly and the battery cell; on the other hand, the main body surface and the connection position of each two flanges respectively wrap around different surfaces of the peripheral side of the active material coating portion, so that each surface of the peripheral side of the active material coating portion can be effectively wrapped, which can further improve the reliability of the electrode assembly and improve the stability and reliability of the battery cell.

[0033] 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, namely 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 of the peripheral side of the active material coating portion arranged in sequence. 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 and cover a small surface on the peripheral side of the active material coating portion. The second flange and the fourth flange are connected 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.

[0034] In some embodiments, the second insulating portion includes a plurality of insulating sub-portions, each of which is connected to the main surface of the main body portion in a one-to-one correspondence, with any two adjacent insulating sub-portions being connected. During the process of installing the electrode assembly into the housing, the first insulating portion enters the housing first, and the second insulating portion enters the housing last. During this process, the insulating member can be inserted into the housing in the direction of insertion, and the housing will not scrape the edges of the insulating member, thereby reducing movement and slippage of the insulating member.

[0035] In some embodiments, any two adjacent insulating sections partially 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, fully reducing the leakage of the active material coating part, reducing the risk of corrosion of the shell, and improving the reliability of the electrode assembly to improve the stability and reliability of the battery cell.

[0036] 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 a portion of the conductive portion extends into the receiving portion after passing through the avoidance hole and the through hole and is connected to the pole. Since the pole is provided with a receiving portion, the hollow structure of the receiving portion can, on the one hand, reduce the weight of the pole to a certain extent, thereby improving the weight energy density of the battery cell and the battery; on the other hand, the conductive portion can be accommodated in the receiving portion, thereby improving the assembly efficiency of the conductive portion, saving the space occupied by the conductive portion, and making 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, making the structure of the battery cell more compact, and more conducive to improving the energy density of the battery cell.

[0037] In some embodiments, it further includes: a protective member, which is provided on at least one side of the circumference of the first insulating part and is stacked on the outside of the main insulating part. In the above technical solution, by providing a protective member on at least one side of the circumference 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 easier to install the electrode assembly into the shell, and can also protect the insulating member, reducing the chance of the shell scratching the insulating member, and reducing 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 exposure 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.

[0038] In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment. In the technical solution of the embodiment of the present application, by adopting the above battery cell, the reliability and stability of the battery can be improved.

[0039] In a third aspect, the present application provides an electrical device comprising the battery cell of the above embodiment; or comprising the battery of the above embodiment. In the technical solutions of the embodiments of the present application, the reliability and stability of the electrical device can be improved by adopting the above battery cell or battery.

[0040] 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

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0043] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0044] FIG3 is a perspective view of a battery provided in some embodiments of the present application;

[0045] FIG4 is an exploded view of a battery provided in some embodiments of the present application;

[0046] FIG5 is a schematic structural diagram of an electrode assembly, an insulating member, and a protective member of a battery provided in some embodiments of the present application;

[0047] FIG6 is a side view of the structure shown in FIG5 at one viewing angle;

[0048] FIG7 is a cross-sectional view of a battery structure provided by some embodiments of the present application;

[0049] FIG8 is an enlarged view of portion A shown in FIG7 ;

[0050] FIG9 is an enlarged view of portion B shown in FIG7 ;

[0051] FIG10 is a schematic structural diagram of a battery cell bracket provided in some embodiments of the present application from a viewing angle;

[0052] FIG11 is a partial enlarged view of the bracket shown in FIG10;

[0053] FIG12 is a schematic structural diagram of a battery cell bracket provided by some embodiments of the present application from another perspective;

[0054] FIG13 is a partial enlarged view of the bracket shown in FIG12;

[0055] FIG14 is a schematic structural diagram of an electrode assembly, an insulating member, and a protective member of a battery provided in some embodiments of the present application;

[0056] FIG. 15 is a top view of the structure shown in FIG. 14 .

[0057] The accompanying drawings in the specific implementation manner are as follows:

[0058] Electric device 1000, battery 100, controller 200, motor 300,

[0059] Battery cell 10, box body 20, first part 201, second part 202,

[0060] Housing 11, housing 111, opening 1110, housing 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,

[0061] Pole 12, first pole 121, through hole 12130,

[0062] Electrode assembly 2, active material coating portion 21, conductive portion 22, first conductive portion 221,

[0063] Bracket 3, matching groove 30, air passage 301, first exhaust passage 302, second exhaust passage 303, first guide passage 304, second guide passage 305, frame 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,

[0064] 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, vent hole 421, avoidance hole 422, second insulating portion 43, insulating sub-portion 430,

[0065] Protective part 5, explosion-proof valve 6, protective sheet 61, slot cover 7. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0069] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0071] 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).

[0072] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0073] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0074] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0075] In related art, a battery cell generally includes a shell with an opening, a shell cover, an electrode assembly, an insulating member, and a plastic member. The insulating member is connected to the periphery of the plastic member to cover the electrode assembly, thereby insulating the electrode assembly from the shell. However, when the electrode assembly of this structure is installed in the shell, the insulating member is prone to wrinkling and curling due to friction with the shell, and may even detach from the plastic member, resulting in leakage of the electrode assembly, contact with the inner wall of the shell, and corrosion of the shell, which affects the reliability of the battery cell.

[0076] In view of this, in order to solve the above 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, further reducing the risk of corrosion of the shell.

[0077] The battery cells 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 include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, among others.

[0078] For the convenience of description, the following embodiments are described by taking an electric device 1000 according to an embodiment of the present application as a vehicle as an example.

[0079] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can 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 can be provided at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle. For example, the battery 100 can be used as an operating power source for the vehicle. The vehicle can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0080] In some embodiments of the present application, the battery 100 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0081] Please refer to Figure 2, which is an exploded view of a 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.

[0082] The housing 20 is used to provide a storage space for the battery cells 10. The housing 20 can adopt various structures. In some embodiments, the housing 20 can include a first portion 201 and a second portion 202. The first portion 201 and the second portion 202 cover each other, and the first portion 201 and the second portion 202 together define a storage space for the battery cells 10. The second portion 202 can be a hollow structure with one end open. The first portion 201 can be a plate-like structure. The first portion 201 covers the open side of the second portion 202, so that the first portion 201 and the second portion 202 together define a storage space. The first portion 201 and the second portion 202 can also be hollow structures with one end open, with the open side of the first portion 201 covering the open side of the second portion 202. Of course, the housing 20 formed by the first portion 201 and the second portion 202 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0083] 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 hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 100 may be housed within the housing 20. Of course, the battery 100 may also be in the form of a battery module 100, in which multiple battery cells 10 are first connected in series, in parallel, or in a hybrid connection, and then the multiple battery modules 100 are further connected in series, in parallel, or in a hybrid connection to form an entire battery 100, and then housed within the housing 20. The battery 100 may also include other structures, for example, the battery 100 may further include a busbar component for electrically connecting the multiple battery cells 10.

[0084] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0085] Please refer to Figures 3 and 4. Figure 3 is a perspective view of a battery 100 provided in some embodiments of the present application. Figure 4 is an exploded view of a battery 100 provided in some embodiments of the present application. A battery cell 10 is the smallest unit comprising the battery 100. The battery cell 10 includes a housing 11, an electrode assembly 2, and an insulating member 4. The housing 11 includes a housing cover 112 and a housing body 111 having an opening 1110.

[0086] The shell cover 112 is a component that fits over 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 match the shape of the shell body 111 to complement the shell body 111. Optionally, the shell cover 112 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the shell cover 112 from deforming when subjected to compression or collision, thereby providing the battery cell 10 with greater structural strength and improved reliability. The shell cover 112 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the electrode assembly 2 for inputting or outputting electrical energy to the battery cell 10. In some embodiments, the shell cover 112 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The shell cover 112 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this. In some embodiments, an insulating member 4 may be provided inside the housing cover 112 to isolate the electrical connection components in the housing body 111 from the housing cover 112 to reduce the risk of short circuit.

[0087] 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, electrolyte, and other components. The shell body 111 and the shell cover 112 can be independent components. An opening 1110 can be provided on the shell body 111, and the shell cover 112 is closed 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 inserted into the shell. When the interior of the shell body 111 needs to be encapsulated, the shell cover 112 is closed to the shell body 111. The shell body 111 can have a variety of 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 can 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 restrictions on this.

[0088] The electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur. In Figures 3 and 4, the 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 a positive electrode sheet and a 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 tab. The positive electrode tab and the negative electrode tab 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 tabs connect the electrode terminals to form a current loop.

[0089] In some embodiments, the electrode terminal is a pole 12 and the pole 12 is arranged 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 arranged in the shell 11. The conductive part 22 electrically connects the active material coating part 21 and the pole 12, thereby forming a current loop.

[0090] Referring again to FIG. 4 and further to FIG. 5 , FIG. 5 illustrates the structure of the electrode assembly 2, the insulating member 4, and the protective member 5 of the battery 100 according to some embodiments of the present application. The battery cell 10 further includes a bracket 3 disposed within the housing 111 and located at the end of the active material coating portion 21 away from the housing cover 112.

[0091] The battery cell 10 also includes an insulating part 4, which includes a main insulating part 41, a first insulating part 42 and a second insulating part 43. The main insulating part 41 is arranged on the peripheral side of the active material coating part 21, and the first insulating part 42 is arranged between the bracket 3 and the end of the active material coating part 21 away from the shell cover 112, that is, the first insulating part 42 of the insulating part 4 is clamped between the bracket 3 and the end of the active material coating part 21 away from the shell cover 112, and the second insulating part 43 is arranged at the end of the active material coating part 21 close to the shell cover 112.

[0092] 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 is adapted to 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 is adapted to 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 is adapted to 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.

[0093] In the technical solution of the embodiment of the present application, the insulating part 4 is set to include a main insulating part 41, a first insulating part 42 and a second insulating part 43, so that the insulating part 4 can completely wrap the electrode assembly 2. During the process of the electrode assembly 2 wrapped with the insulating part 4 being installed 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.

[0094] Referring again to Figure 5 , the main insulating portion 41 is provided with a liquid passage hole 410 a near the second insulating portion 43. Multiple liquid passage holes 410 a may be provided, and the multiple liquid passage holes 410 a are spaced apart. The multiple liquid passage holes 410 a can increase the fluidity of the electrolyte, increase the contact area between the electrolyte and the active material coating portion 21, and reduce the problem of poor wetting of the active material coating portion 21.

[0095] 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.

[0096] Please refer again to Figure 5 and further to Figure 6, which is a side view of the structure shown in Figure 5 from one viewing angle. As an optional embodiment, multiple liquid holes 410a are spaced apart along the length of the main insulating portion 41, and the total length of the multiple liquid holes 410a along the length of the main insulating portion 41 is less than half the length L of the main insulating portion 41. This minimizes the impact on the strength of the insulating portion 4 while ensuring that the insulating portion 4 is wetted with electrolyte.

[0097] 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.

[0098] 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 .

[0099] Referring again to FIG. 6 , the diameter d of the liquid hole 410a is between 0.5 mm and 1 mm. For example, the diameter of the liquid hole 410a can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. A larger diameter of the liquid hole 410a can easily cause the insulating member 4 to rupture, while a smaller diameter can affect the efficiency of electrolyte infiltration. In this embodiment, by limiting the diameter of the liquid hole 410a to meet the above conditions, not only can the reliability of the insulating member 4 be improved, but also the efficiency of electrolyte infiltration of the insulating member 4 can be improved.

[0100] Please refer to Figures 5 and 6 again. The main insulating part 41 includes a plurality of main parts 410; the plurality of main parts 410 are connected end to end in a ring shape, the plurality of main parts 410 are wrapped together on the peripheral side of the active material coating part 21 and any two adjacent main parts 410 are connected, the liquid holes 410a are provided in the main parts 410, and the number of liquid holes 410a on each main part 410 is greater than or equal to 3, thereby improving the efficiency of the insulating part 4 in soaking the electrolyte.

[0101] In some embodiments, the distance between two adjacent liquid holes 410a is m1. Among two adjacent sidewalls of the electrode assembly 2, the distance between the outermost liquid hole 410a on the main body 410 covering one sidewall and the other sidewall is m2. m2 is smaller than m1, which further improves the efficiency of electrolyte infiltration of the insulating member 4. m1 can be 20 mm to 35 mm, for example, 20 mm, 24 mm, 28 mm, 30 mm, 32 mm, 35 mm, etc., and m2 can be 5 mm to 20 mm, for example, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, etc.

[0102] The housing 11 is provided with an explosion-proof valve 6, and the insulating member 4 has a vent hole 421, which corresponds to the position of the explosion-proof valve 6. The explosion-proof valve 6 is an integrally formed component with a thinned portion; alternatively, the explosion-proof valve 6 can be a separate component. The provision of the vent hole 421 in the insulating member 4 allows the explosion-proof valve 6 to communicate with the vent hole 421, allowing the explosion-proof valve 6 to properly vent and relieve pressure.

[0103] In some embodiments, the explosion-proof valve 6 may be provided on the housing cover 112 , and correspondingly, the vent hole 421 is provided on the second insulating portion 43 of the insulating member 4 .

[0104] In other embodiments, the explosion-proof valve 6 may be provided on the side wall of the shell 111 , and correspondingly, the air vent 421 is provided on the main insulating portion 41 of the insulating member 4 .

[0105] 3 to 5 again, the explosion-proof valve 6 is located on the wall of the housing 111 opposite to the bracket 3 , the vent 421 is provided in the first insulating portion 42 , and the bracket 3 has an exhaust hole 313 , which corresponds to the position of the explosion-proof valve 6 .

[0106] In the above technical solution, during 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, fully 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.

[0107] 7-8, FIG7 is a cross-sectional view of the structure of the battery 100 provided in some embodiments of the present application, and FIG8 is an enlarged view of the portion A shown in FIG7. The explosion-proof valve 6 and the housing 111 can be fixedly connected or detachably connected.

[0108] 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.

[0109] 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.

[0110] Referring again to FIG. 7 and further to FIG. 9 , which is an enlarged view of portion B shown in FIG. Second mounting hole 114 includes a first hole segment 1151 and a second hole segment 1152 . First hole segment 1151 and second hole segment 1152 are arranged and connected in the thickness direction of housing body 111 . Second hole segment 1152 is closer to the inner cavity of housing body 111 than first hole segment 1151 .

[0111] 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 cooperates with the first step surface 1161 .

[0112] Optionally, the second mounting hole 114 also includes a third hole section 1153, which is connected to the 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.

[0113] Optionally, as shown in Figures 3, 4, and 7-8, the battery cell 10 further includes a protective sheet 61, which is disposed on a side of the explosion-proof valve 6 facing 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, and no further restrictions are imposed herein.

[0114] 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 makes it easier to reduce the oxidation rate of the explosion-proof valve 6.

[0115] 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, and a third step surface 1163 is formed between the fourth hole section 1154 and the third hole section 1153. The protective sheet 61 is arranged in the fourth hole section 1154 and cooperates with the third step surface 1163.

[0116] In some embodiments, there is one exhaust hole 313. In other embodiments, referring again to FIG. 4 , there are multiple exhaust holes 313, which are spaced apart in the length direction and / or width direction of the bracket 3 to improve exhaust efficiency.

[0117] In some embodiments, there is one vent 421. In other embodiments, referring again to FIG. 5 , there are multiple vents 421, which are spaced apart along the length of the first insulating portion 42. Furthermore, the vents 421 can be disposed in the middle of the first insulating portion 42 and spaced apart along the length of the first insulating portion 42. This arrangement can improve exhaust efficiency.

[0118] Please refer to Figures 10 and 11. Figure 10 is a schematic structural diagram of a bracket 3 of a battery cell 10 according to some embodiments of the present application, viewed from one perspective; Figure 11 is a partially enlarged view of the bracket 3 shown in Figure 10. The bracket 3 includes a bracket body 31 having a first side 311 and a second side 312. The first side 311 and the second side 312 are arranged opposite each other in the thickness direction of the bracket body 31. The exhaust holes 313 extend through the first side 311 and the second side 312.

[0119] 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 the 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.

[0120] 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.

[0121] In the above technical solution, by providing a 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, thereby increasing the distance between the first side 311 of the frame body 31 and the active material coating portion 21, that is, increasing the distance between the exhaust hole 313 and the active material coating portion 21, so that a first exhaust channel 302 connected to the exhaust hole 313 is defined between the first side 311 of the frame body 31 and the active material coating portion 21, thereby improving the exhaust capacity. When the battery cell 10 tends to thermal runaway, the generated gas can first enter the first exhaust channel 302, then pass through the bracket 3 from the exhaust hole 313, and finally 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, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0122] 10 and 11 , the bracket 3 is provided with an air-passing notch 315 on its circumference. The air-passing notch 315 passes through the first side 311 and the second side 312 of the bracket body 31 . The bracket 3 is circumferentially matched with the housing 11 to form an air passage 301 between the air-passing notch 315 and the housing 11 . The air passage 301 is connected to the first exhaust passage 302 .

[0123] Among them, the meaning of the notch is a gap formed by a missing piece on the edge of the structure. The air gap 315 in the embodiment of the present application refers to the air 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 channel 301.

[0124] When the battery cell 10 is prone to 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 channel 301, and finally be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0125] In the above technical solution, 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 circumferentially by 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.

[0126] 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 can be evenly distributed around the circumference of the bracket 3, or the plurality of air gaps 315 can 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.

[0127] Therefore, by setting multiple gas holes 315, multiple gas channels 301 can be defined. Part of the gas in the first exhaust channel 302 can diffuse to the surroundings, pass through the bracket 3 from the multiple gas channels 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 multiple gas holes 315, further shortening the infiltration time and greatly improving the infiltration efficiency.

[0128] Please refer to Figures 10 and 11 again. The first side 311 of the frame body 31 is further provided with a first extension portion 331. 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. The end of the active material coating portion 21 away from the shell cover 112 is arranged in the matching groove 30.

[0129] That is, the bracket body 31 is provided at the end of the electrode assembly 2, and the first extension portion 331 is provided on the circumference 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 housing 11 together. Alternatively, the bracket 3 can be pre-installed on the housing 11, and then the electrode assembly 2 is installed into the housing 11 and matched with the bracket 3.

[0130] In an embodiment in which the bracket 3 and the electrode assembly 2 are assembled and then installed together into the shell 11, 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 fallen active material from chemically reacting with 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 snapped together, 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 occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0131] 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, 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.

[0132] 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.

[0133] The gas notch 315 is provided through the first extension portion 331 and the frame body 31. The formed gas passage 301 runs through both sides of the thickness of the frame 3 to connect the first exhaust passage 302 and the explosion-proof valve 6. The gas in the first exhaust passage 302 can quickly flow to the exhaust hole 313 and the gas passage 301, respectively, achieving instantaneous pressure relief. Finally, the gas can be discharged from the explosion-proof valve 6 for 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.

[0134] In some embodiments, the first extension portion 331 and the first abutting portion 321 are spaced apart from each other. The first extension portion 331 and the first abutting portion 321 together form a first guide channel 304 . The first guide channel 304 connects at least one air passage 301 and the first exhaust channel 302 .

[0135] First guide channel 304 not only increases the space occupied by the exhaust path, thereby improving exhaust capacity, but also serves as a guide, allowing some of the gas entering first exhaust channel 302 to flow along first guide channel 304 to gas passage 301. The gas then passes through gas passage 301, through bracket 3, and ultimately out of explosion-proof valve 6 to relieve pressure, further reducing the risk of combustion and explosion of battery cells 10 and improving the reliability and stability of battery 100. Furthermore, first guide channel 304 guides the flow of electrolyte, further shortening the infiltration time and significantly improving infiltration efficiency.

[0136] 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. The multiple gas holes 315 on the same side of the exhaust hole 313 share one first guide channel 304.

[0137] 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 channels 301 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.

[0138] When the battery cell 10 is prone to 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. The other portion of the gas can be diverted through the two first guide channels 304, then pass through the bracket 3 through the multiple gas passages 301 and flow to the second side 312 of the bracket body 31. Finally, it can be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0139] In the above technical solution, gas entering the first exhaust channel 302 can flow toward both sides of the exhaust hole 313 along the length of the battery cell 10 under the guidance of the two first guide channels 304, achieving instantaneous pressure relief. The gas then passes through the bracket 3 through the multiple gas passages 301 and is ultimately discharged through the explosion-proof valve 6, achieving final pressure relief. This further reduces the risk of combustion and explosion of the battery cell 10 and improves the reliability and stability of the battery 100. During electrolyte injection, the electrolyte can flow under the guidance of the two first guide channels 304, shortening the infiltration time and improving the infiltration efficiency.

[0140] Please refer to Figures 10 and 11 again. The first abutting portion 321 is arranged in an arc shape, so that the first abutting portion 321 and the first extension 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.

[0141] There are two first abutting portions 321 , which are respectively located on both sides of the exhaust hole 313 . For example, the two first abutting portions 321 are formed as arc-shaped plates, with both ends of each arc-shaped plate spaced apart and facing the exhaust hole 313 .

[0142] Among them, multiple air gaps 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 gaps 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 gaps 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 gaps 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 gaps 301, and can finally be discharged from the explosion-proof valve 6.

[0143] Therefore, in the above technical solution, the arc-shaped first abutting portion 321 can, on the one hand, reduce the probability of pressure loss on the end of the bracket 3 against the electrode assembly 2. On the other hand, it can define an arc-shaped first guide channel 304 with the first extension portion 331, thereby increasing the space occupied by the first guide channel 304 and allowing the multiple air-passing notches 315 located on the same side of the exhaust hole 313 to communicate with the first guide channel 304. This improves the space utilization of the bracket 3 and further enhances the exhaust capacity. In addition, the infiltration time can be further shortened, thereby improving the infiltration efficiency.

[0144] Please refer to Figure 10 again, and further to Figures 12 and 13. Figure 12 is a schematic structural diagram of the bracket 3 of the battery cell 10 provided in some embodiments of the present application from another perspective. Figure 13 is a partial enlarged view of the bracket 3 shown in Figure 12. The second side 312 of the bracket body 31 is provided with a second abutment portion 322, and the second abutment portion 322 is protruded in a direction away from the first side 311. The second abutment portion 322 is used to abut against the wall of the shell 11 where the explosion-proof valve 6 is provided, and the bracket 3 and the shell 11 together form a second exhaust channel 303, and the second exhaust channel 303 is connected to at least one gas passage 301.

[0145] The second abutting portion 322 is arranged on the second side 312 of the frame body 31. Specifically, the second abutting portion 322 is arranged on the side of the end of the frame body 31 away from the electrode assembly 2. Since the second abutting portion 322 abuts against the wall of the shell 11 where the explosion-proof valve 6 is set, 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.

[0146] When the battery cell 10 is prone to 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 converges in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0147] In the above technical solution, a second abutting portion 322 is provided on the second side 312 of the frame body 31, and the second abutting portion 322 abuts against the wall of the shell 11 on which the explosion-proof valve 6 is provided, 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.

[0148] 12 and 13 , a second extension portion 332 is further 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 of the air passage 301 and the second exhaust channel 303 .

[0149] The second guide channel 305 not only increases the space occupied by the exhaust path, thereby improving exhaust capacity, but also serves as a guide. A portion of the gas that passes through the bracket 3 from the gas passage 301 can flow along the second guide channel 305 to the second exhaust channel 303, ultimately being discharged through the explosion-proof valve 6 to achieve pressure relief. This further reduces the risk of combustion and explosion of the battery cell 10 and improves the reliability and stability of the battery 100. Furthermore, the second guide channel 305 guides the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0150] In the longitudinal direction of the battery cell 10 , there are multiple gas passage openings 315 on both sides of the exhaust hole 313 , and the multiple gas passage openings 315 on the same side share one second guide channel 305 .

[0151] 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 positions, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding positions. 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 positions, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding positions.

[0152] When the battery cell 10 is prone to 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. 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. Then, it flows along the second guide channel 305 and finally converges in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0153] When injecting liquid, the electrolyte can flow along the second guide channel 305 to the multiple gas gaps 315. The electrolyte passing through the gas gaps 315 can first flow along the second guide channel 305 and then flow toward the electrode assembly 2, or it can flow directly toward the electrode assembly 2, shortening the electrolyte infiltration time and improving the infiltration efficiency.

[0154] In the above technical solution, gas passing through the bracket 3 can be guided by the second flow channel 305 to flow toward the second exhaust channel 303 located in the middle, and ultimately discharged through the explosion-proof valve 6, achieving 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. The electrolyte can also flow toward the multiple gas holes 315 under the guidance of the second flow channel 305, shortening the infiltration time and improving the infiltration efficiency.

[0155] Please refer to Figure 13 again. The second side 312 of the frame body 31 has a mounting recess 316, which is recessed toward the first side 311. The mounting recess 316 and the wall of the shell 11 where the explosion-proof valve 6 is set define a second exhaust channel 303. The exhaust hole 313 is provided on the bottom wall of the mounting recess 316.

[0156] The mounting recess 316 is a groove recessed relative to the surface of the second side 312 of the frame body 31 . 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 .

[0157] In the above technical solution, by providing 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 provided 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.

[0158] 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, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0159] In some embodiments, the second side 312 of the frame body 31 is further provided with a weight-reducing groove 319 , which not only reduces the weight of the bracket 3 , but also further increases the space occupied by the exhaust path, improves the exhaust capacity, and improves space utilization.

[0160] Referring again to FIG. 12 and FIG. 13 , the second abutting portion 322 is configured to be arc-shaped, so that the second abutting portion 322 and the second extending portion 332 define an arc-shaped second guide channel 305 .

[0161] There are two second abutting portions 322, one located on either side of the exhaust hole 313. For example, the two first abutting portions 321 are each formed as an arcuate plate, with both ends of each arcuate plate spaced apart and positioned opposite the exhaust hole 313. For another example, the two first abutting portions 321 are each formed as a closed annular plate.

[0162] Among them, the multiple air gaps 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 gaps 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.

[0163] Therefore, in the above technical solution, the second abutting 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 circumferentially and spaced apart around the corresponding second abutting portion 322. This defines an arc-shaped second guide channel 305, thereby increasing the space occupied by the second guide channel 305, improving the space utilization of the bracket 3, and further enhancing the exhaust capacity. Furthermore, the infiltration time can be further shortened, thereby improving the infiltration efficiency.

[0164] 3-5 , the pole 12 includes a first pole 121 , which is disposed on the wall opposite to the shell body 111 and the shell cover 112 . The first insulating portion 42 is provided with an escape 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 .

[0165] In the above technical solution, by providing the avoidance hole 422 on the first insulating portion 42, the first insulating portion 42 can be kept away from the conductive portion 22. On the one hand, this can reduce the risk of the first insulating portion 42 damaging the conductive portion 22, and on the other hand, it can facilitate the electrical connection between the conductive portion 22 and the first terminal 121 on the housing 11. In addition, when the electrolyte is injected into the housing 11, the electrolyte can enter the electrode assembly 2 through the avoidance hole 422, thereby accelerating the infiltration of the electrolyte.

[0166] As an optional solution, the pole 12 includes two first poles 121 with opposite polarities, and two avoidance holes 422 are defined 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.

[0167] 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.

[0168] Please refer to Figure 3 and Figure 4 again. 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.

[0169] A groove is provided on the 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.

[0170] In the above technical solution, by providing a 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.

[0171] Please refer again to Figures 5-7, and further to Figures 14 and 15. Figure 14 is 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; Figure 15 is a top view of the structure shown in Figure 14. The main body insulating portion 41 includes a plurality of main body portions 410, which are connected end to end in a ring shape. The plurality of main body portions 410 are collectively wrapped around the circumference of the active material coating portion 21, and any two adjacent main body portions 410 are connected. The first insulating portion 42 and the second insulating portion 43 are respectively located at the axial ends of the ring structure formed by the plurality of main body portions 410.

[0172] Specifically, the number of main body parts 410 can be two, three or more than three, and can be selected specifically according to the shape of the active material coating part 21. For example, the number of main body parts 410 and the number of 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 part of the multiple main body parts 410 can be overlapped.

[0173] After being connected, the multiple main body parts 410 form 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.

[0174] Among them, any two adjacent main body parts 410 are connected by a first tape (not shown in the figure). The first tape connection method is used instead of the hot melt connection method. On the one hand, it can save hot fuses and reduce material costs. On the other hand, it does not require hot melt connection equipment and other structures, which can simplify the connection steps and further reduce production costs.

[0175] 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 for the two adjacent main bodies 410 to be connected by 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 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 portion 21, fully reduce the bare leakage of the active material coating portion 21, reduce the risk of corrosion of the shell 11, and further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0176] Optionally, the peripheral side of the active material coating portion 21 has multiple surfaces; please refer to Figure 9 again, each main body portion 410 includes a main surface and two flanges, the two flanges are arranged on both sides of the main surface, and any two adjacent main bodies 410 are connected by the flanges. The connection structure of each main surface and each two flanges respectively wraps different surfaces of the peripheral side of the active material coating portion 21.

[0177] Specifically, the peripheral side of the active material coating part 21 can 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 can be two, and the main surfaces of the two main body parts 410 can 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.

[0178] 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, there is a second surface between two adjacent first surfaces, and there is a first surface between two adjacent second surfaces. Correspondingly, the number of main bodies 410 can be three, and the main surfaces of the three main bodies 410 can respectively cover the three spaced first surfaces of the active material coating portion 21, and the flanges of two adjacent main bodies 410 are connected together to cover the second surface of the active material coating portion 21.

[0179] In the above technical solution, on the one hand, any two adjacent main body parts 410 can be connected by flange connection to ensure the reliability of the 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.

[0180] 5 and 14 - 15 again, the active material coating portion 21 has four sides on its circumference, that is, the cross-sectional outer contour of the active material coating portion 21 is a quadrilateral.

[0181] The main insulating portion 41 includes two main portions 410, which 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 and the third flange 4122 are connected, and the second flange 4113 and the fourth flange 4123 are connected.

[0182] 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 sequentially arranged on the circumference of the active material coating portion 21 .

[0183] 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.

[0184] When the circumferential side of the active material coating portion 21 has four surfaces, the battery cell 10 is roughly square. At this time, the first main body portion 411 and the second main body portion 412, as well as their connection structure can completely cover the four circumferential sides of the active material coating portion 21, so that the four circumferential sides of the active material coating portion 21 are completely separated from the inner wall of the shell 11, reducing the risk of leakage of the active material coating portion 21 and fully improving the reliability and stability of the square battery cell 10.

[0185] In some embodiments, the first flap 4112 and the third flap 4122 partially overlap and are connected by a first adhesive tape. The middle portion of the first adhesive tape is bonded to the outside of the first and third flaps 4112, 4122, and the ends of the first adhesive tape are bonded to the outside of the first and second main surfaces 4111, 4121. The second flap 4113 and the fourth flap 4123 partially overlap and are connected by a first adhesive tape. The middle portion of the first adhesive tape is bonded to the outside of the second and fourth flaps 4113, 4123, and the ends of the first adhesive tape are bonded to the outside of the first and second main surfaces 4111, 4121.

[0186] In the above technical solution, one of the first adhesive tapes can connect the first main surface 4111, the second main surface 4121, the first flange 4112 and the third flange 4122 together, and the other first adhesive tape can connect the first main surface 4111, the second main surface 4121, the second flange 4113 and the fourth flange 4123 together. On the one hand, it can shape the first main body 411 and the second main body 412, so that the first main body 411 and the second main body 412 can be maintained in a folded state that fits the circumference of the active material coating part 21. On the other hand, it increases the connection area between the first adhesive tape and the first main body 411 and the second main body 412, thereby improving the connection reliability between the two, and 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 exposure 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.

[0187] 14-15 again, the second insulating portion 43 includes a plurality of insulating sub-portions 430 , which are connected to the main surfaces of the main body portions 410 in a one-to-one correspondence, and any two adjacent insulating sub-portions 430 are connected.

[0188] 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 .

[0189] During the process of installing the electrode assembly 2 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.

[0190] In some embodiments, any two adjacent insulating sections 430 are connected using a second tape (not shown in the figure). Using the second tape connection method instead of the hot melt connection method can, on the one hand, save thermal fuses and reduce material costs. On the other hand, it does not require hot melt connection equipment and other structures, which can simplify the connection steps and further reduce production costs.

[0191] 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.

[0192] In the above technical solution, the second tape can connect the two adjacent insulating sections 430 and the two adjacent flanges together. On the one hand, the two adjacent main bodies 410 and the second insulating part 43 can be shaped, so that the two main bodies 410 and the second insulating part 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 part 43 is increased, thereby improving the connection reliability. It can fully ensure that the two adjacent main bodies 410 and the second insulating part 43 can wrap the active material coating part 21, fully reduce the exposure 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.

[0193] 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 part 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.

[0194] 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.

[0195] Such a configuration facilitates the use of the second tape to connect to both 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.

[0196] Optionally, in the 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, increase the connection area between the second tape and the insulating section 430 located on the inside, and further reduce the probability and risk of insulation failure at the overlapping position of the two, which is more conducive to improving the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0197] Of 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 close to the insulating section 430, so that the flange located on the inside can expose more area, increase the connection area between the second tape and the flange located on the inside, and further reduce the probability and risk of insulation failure at the overlapping position of the two, which is more conducive to improving the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0198] 14-15 again, each main body portion 410 has a notch 401 at the connection position between the main surface and the flange; and / or, the insulating portion 430 has a notch 401 at the connection position between the main surface and the corresponding main surface.

[0199] 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 using a notch machine or other equipment to reduce the thickness of the insulating part 4 at the notch 401. It can also be pre-formed during the manufacturing process of the insulating part 4.

[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 wrapping the insulating part 4 to the active material coating part 21, and can improve the accuracy and reliability of the wrapping of the insulating part 4, so as to further improve the stability and reliability of the battery cell 10.

[0201] In some embodiments, a notch 401 is formed at a connection position between the main insulating portion 41 and the first insulating portion 42 ; and / or a notch 401 is formed at a connection position between the main insulating portion 41 and the second insulating portion 43 .

[0202] 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 wrapping the insulating part 4 to the active material coating part 21, and can improve the accuracy and reliability of the wrapping of the insulating part 4, so as to further improve the stability and reliability of the battery cell 10.

[0203] Please refer to Figures 14 and 15 again. In this 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.

[0204] Taking 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 active material coating portion 21 has four surfaces on its circumference, namely, two large surfaces arranged oppositely and two small surfaces arranged oppositely.

[0205] When the insulating member 4 is used to wrap the electrode assembly 2, the first insulating portion 42 of the insulating member 4 can be first covered on the end of the active material coating portion 21 provided on the conductive portion 22, and then the first main body 411 and the second main body 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 411 and the second main surface 4121 of the second main body 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 411 close to the first insulating portion 42 and the end of the third flange 4122 of the second main body 412 close to the first insulating portion 42, so that the first flange The edge 4112 and the third flange 4122 cover a small surface around the active material coating portion 21. Another first adhesive tape is used to connect the end of the second flange 4113 of the first main portion 411 near the first insulating portion 42 to the end of the fourth flange 4123 of the second main portion 412 near the first insulating portion 42. The second flange 4113 and the fourth flange 4123 cover another small surface around the active material coating portion 21. The two insulating segments 430 of the second insulating portion 43 are then bent according to the third notch 401c. A second adhesive tape is used to connect the ends of the first and third flanges 4112, 4122 near the second insulating portion 43 to the two insulating segments 430. Another second adhesive tape is used to connect the ends of the second and fourth flanges 4113, 4123 near the second insulating portion 43 to the two insulating segments 430. The entire insulating member 4 is bent multiple times according to the notches 401 to encapsulate the active material coating portion 21.

[0206] Referring again to FIG. 4-9 , the bracket 3 defines a through-hole 314 through which the first pole 121 is exposed. The through-hole 314 is disposed opposite the avoidance hole 422. The pole 12 defines a receiving portion communicating with the through-hole 314. At least a portion of the conductive portion 22 extends through the avoidance hole 422 and the through-hole 314, then into the receiving portion and connects to the pole 12. In other words, the pole 12 is configured as a hollow structure.

[0207] Here, at least partially means that the conductive portion 22 can be completely accommodated in the accommodation portion, or only partially accommodated in the accommodation portion. Since the terminal 12 is provided with an accommodation portion, the hollow structure of the accommodation portion can, on the one hand, reduce the weight of the terminal 12 to a certain extent, thereby improving the weight energy density of the battery cell 10 and the battery 100. On the other hand, the conductive portion 22 can be accommodated in the accommodation portion, which improves the assembly efficiency of the conductive portion 22 and saves the space occupied by the conductive portion 22, making full use of the space in the battery cell 10, making the fit between the bracket 3 and the terminal 12, and between the bracket 3 and the conductive portion 22 tighter and more reliable, making the structure of the battery cell 10 more compact, and more conducive to improving the energy density of the battery cell 10.

[0208] More specifically, by partially or entirely containing the conductive portion 22 within the accommodating portion, the portion of the conductive portion 22 located within the accommodating portion can occupy the space within the terminal 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is extended from the side of the active material coating portion 21 close to the terminal 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the terminal 12 can be reduced, the size of the active material coating portion 21 in the direction in which the conductive portion 22 is extended can be increased, the distance between the active material coating portion 21 and the terminal 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0209] 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.

[0210] 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 facing away from the active material coating portion 21 .

[0211] Referring again to FIG. 9 , the housing 111 is provided with a first mounting hole 113, an upper plastic member 117, and a lower plastic member 118. The terminal 12 is provided at the first mounting hole 113. The upper plastic member 117 surrounds the first mounting hole 113 and is at least partially located outside the housing 111. The upper plastic member 117 sleeves around the outside of the terminal 12 and is at least partially located between the wall of the first mounting hole 113 and the terminal 12. The lower plastic member 118 surrounds the first mounting hole 113 and is at least partially located within the housing 111. The lower plastic member 118 sleeves around the outside of the terminal 12 and is at least partially located between the wall of the first mounting hole 113 and the terminal 12, thereby improving the sealing performance between the terminal 12 and the housing 11.

[0212] Please refer to Figures 3 to 4 and 7 again. 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 111 and is located 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 to facilitate the connection between the first conductive portion 221 and the first pole 121.

[0213] As an optional solution, the electrode 12 includes two first electrodes 121, and the bracket 3 has two through-holes 314. When the electrode assembly 2 is installed in the housing 11, the two conductive portions 22 of the electrode assembly 2 can be simultaneously and correspondingly passed through the two through-holes 314 of the bracket 3, facilitating electrical connection between the conductive portions 22 and the corresponding first electrodes 121. This makes the connection more convenient and helps improve the assembly efficiency of the battery cell 10.

[0214] Referring again to FIG. 5 , FIG. 14 and FIG. 15 , the battery cell 10 further includes a protective member 5 . The protective member 5 is disposed on at least one side of the circumference of the first insulating portion 42 and is stacked on the outside of the main insulating portion 41 .

[0215] Before the electrode assembly 2 wrapped with the insulating part 4 is installed into the shell 11, the protective part 5 can be tilted 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 the other structures of the insulating part 4, and the protective part 5 can enter the shell 11 along the shell entry direction, playing a role in guiding and protecting the insulating part 4, reducing the scratching of the insulating part 4 by the shell 11, and reducing 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 due to leakage of the active material coating part 21.

[0216] In the above technical solution, a protective member 5 is provided on at least one side of the circumference 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, making it convenient to install the electrode assembly 2 into the shell 11, and can also protect the insulating member 4, reducing the probability of the shell 11 scratching the insulating member 4, and reducing the movement and slippage 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, fully 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.

[0217] 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 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.

[0218] 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.

[0219] 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 solutions of the embodiments of the present application, the reliability and stability of the battery 100 can be improved by adopting the above battery cells 10.

[0220] 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 can be any of the aforementioned devices or systems using the battery 100.

[0221] 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.

[0222] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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, wherein, Comprising: A housing, including a housing cover and a housing body with an opening, the housing cover covering the opening, and a pole provided on the housing; An electrode assembly, including a conductive part and an active material coating part provided in the housing, the conductive part electrically connecting the active material coating part and the pole; A bracket, provided in the housing body at an end of the active material coating part away from the housing cover; An insulating part, including a main body insulating part, a first insulating part, and a second insulating part, the main body insulating part provided on the periphery of the active material coating part, the first insulating part provided between the bracket and the end of the active material coating part away from the housing cover, and the second insulating part provided at an end of the active material coating part close to the housing cover.

2. The battery cell according to claim 1, wherein, A plurality of liquid through holes arranged at intervals are provided at a position of the main body insulating part close to the second insulating part.

3. The battery cell according to claim 2, wherein, The plurality of liquid through holes are arranged at intervals in the length direction of the main body insulating part.

4. The battery cell according to claim 2, wherein, 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, wherein, The distance between the liquid through hole and the second insulating part is 3 mm - 5 mm.

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

7. The battery cell according to claim 2, wherein, The main body insulating part includes a plurality of main body parts; the plurality of main body parts are sequentially connected end to end to form a ring shape, the plurality of main body parts jointly wrap around the periphery of the active material coating part and any two adjacent main body parts are connected, and the liquid through holes are provided in the main body parts and the number of the liquid through holes on each main body part is greater than or equal to 3.

8. The battery cell according to any one of claims 1-7, wherein, An explosion-proof valve is provided on the housing, and the insulating part has a ventilation hole corresponding to the position of the explosion-proof valve.

9. The battery cell according to claim 8, wherein, The explosion-proof valve is located on a wall body of the housing body opposite to the bracket, the ventilation hole is provided 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, wherein, The number of the ventilation holes 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, wherein, The number of the exhaust holes 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, wherein, The bracket includes: A bracket body, the bracket body having a first side and a second side oppositely arranged in its thickness direction, and the exhaust hole penetrating through the first side and the second side; A first abutting part, provided on the first side and protruding in a direction away from the second side, for abutting against an end of the active material coating part away from the housing cover, so as to jointly form a first exhaust channel between the exhaust hole and the active material coating part.

13. The battery cell according to claim 12, wherein, An air passing notch penetrating through the first side and the second side is provided in the circumferential direction of the bracket, and an air passing channel is jointly formed between the air passing notch and the housing, and the air passing channel is communicated with the first exhaust channel.

14. The battery cell according to claim 13, wherein, A plurality of the air passing notches arranged at intervals are provided in the circumferential direction of the bracket, and each air passing notch jointly forms an air passing channel with the housing, and the plurality of air passing channels are arranged in a circumferential ring around the first exhaust channel.

15. The battery cell according to claim 13, wherein, A first extension portion protrudes from the first side of the frame body. The first extension portion is circumferentially arranged around the frame body and defines a mating groove with the frame body. One end of the active material coating portion away from the shell cover is arranged in the mating groove.

16. The battery cell according to claim 15, wherein, The air passing notch penetrates through the first extension portion and the frame body.

17. The battery cell according to claim 15, wherein, The first extension portion and the first abutting portion are arranged at intervals to jointly form a first diversion channel, and the first diversion channel communicates with at least one of the air passing channels and the first exhaust channel.

18. The battery cell according to any one of claims 13-17, wherein, A second abutting portion protruding in a direction away from the first side is provided on the second side of the frame body. The second abutting portion is used to abut against the wall body of the housing where the explosion-proof valve is provided, and jointly forms a second exhaust channel; the second exhaust channel communicates with at least one of the air passing channels.

19. The battery cell according to claim 18, wherein, A second extension portion protrudes from the second side of the frame body. The second extension portion and the second abutting portion are arranged at intervals to jointly form a second diversion channel, and the second diversion channel communicates with at least one of the air passing channels and the second exhaust channel.

20. The battery cell according to claim 19, wherein, In the length direction of the battery cell, the number of the air passing notches on both sides of the exhaust hole is multiple, and a plurality of the air passing notches on the same side share one second diversion channel.

21. The battery cell according to any one of claims 1-20, wherein, The pole column includes a first pole column. The first pole column is arranged on the wall body of the shell body opposite to the shell cover. An avoidance hole is formed in the first insulating portion. The avoidance hole is used for the conductive portion to pass through so that the conductive portion can be connected to the first pole column.

22. The battery cell according to claim 21, wherein, The pole column includes two first pole columns with opposite polarities, and two avoidance holes are formed in the first insulating portion.

23. The battery cell according to claim 21, wherein, The main body insulating portion includes a plurality of main body portions; the plurality of main body portions are sequentially connected end to end in a ring shape. The plurality of main body portions jointly wrap around the circumferential side of the active material coating portion and any two adjacent main body portions are connected. The first insulating portion and the second insulating portion are respectively located at the axial two ends of the annular structure formed by the plurality of main body portions.

24. The battery cell according to claim 23, wherein, The connection positions of any two adjacent main body portions have partial overlaps.

25. The battery cell according to claim 23, wherein, The circumferential side of the active material coating portion has a plurality of surfaces; Each main body portion includes a main body surface and two flanges arranged on both sides of the main body surface. Any two adjacent main body portions are connected by the flanges, and each main body surface and the connection structures of every two flanges respectively wrap different surfaces on the circumferential side of the active material coating portion.

26. The battery cell according to claim 25, wherein, The circumferential side of the active material coating portion has four surfaces; The main body insulating portion includes two main body portions arranged on both sides of the first insulating portion, namely a first main body portion and a second main body portion. The first main body portion 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 portion 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 and the third flange are connected, and the second flange and the fourth flange are connected; The connection structures of the first main surface, the first flanging, and the third flanging, and the connection structures of the second main surface, the second flanging, and the fourth flanging respectively wrap four surfaces arranged in sequence on the peripheral side of the active material coating portion.

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

28. The battery cell according to claim 27, wherein, Any two adjacent insulating sub-portions have partial overlap.

29. The battery cell according to any one of claims 21-28, wherein, A through hole exposing the first pole column is formed in the bracket, the through hole is disposed opposite to the avoidance hole, a receiving portion communicating with the through hole is formed in the pole column, and at least a 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 column.

30. The battery cell according to any one of claims 1-29, wherein, Further comprising: A protection member is disposed on at least one side of the peripheral side of the first insulating portion and stacked outside the main body insulating portion.

31. A battery, wherein, Comprising the battery cell according to any one of claims 1-30.

32. An electrical device, wherein, Comprising the battery according to claim 31.

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