Battery cell, battery, and electric device

Abstract

A battery cell, a battery, and an electric device. The battery cell comprises: a casing, poles being provided on the casing, and the casing comprising a casing cover and a casing body; an electrode assembly; an insulating member, the insulating member covering the circumference of the electrode assembly and comprising a first insulating part covering the side of the electrode assembly away from an opening; and a protective member provided on at least one of peripheral sides of the first insulating part and located between the insulating member and the casing. By providing the protective member, the probability that the casing scrapes the insulating member can be reduced, the exposure of an active substance coated part is fully reduced, the risk of corrosion of the casing is reduced, and the reliability and stability of the electrode assembly and the battery cell 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 202321954544.2 and application date of July 24, 2023, 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] Application Contents

[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, on which a pole is provided, comprising a shell cover and a shell body with an opening, the shell cover covering the opening; 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; an insulating part covering the circumference of the electrode assembly and comprising a first insulating part covering the side of the electrode assembly away from the opening; a protective part arranged on at least one side of the circumference of the first insulating part and located between the insulating part and the shell.

[0008] In the technical solution of the embodiment of the present application, a protective part is provided on at least one side of the circumference of the first insulating part. On the one hand, the protective part can play a guiding role in the process of installing the electrode assembly into the shell, making it convenient to install the electrode assembly into the shell, and can also protect the insulating part, reducing the chance of the shell scratching the insulating part, and reducing the movement and slippage of the insulating part. On the other hand, after the electrode assembly is installed in the shell, the protective part is located between a part of the insulating part and the shell, which can further isolate the active material coating part from the shell, and cooperate with the insulating part to achieve double insulation, fully reduce the leakage of the active material coating part, and reduce the risk of corrosion of the shell, so as to further improve the reliability and stability of the electrode assembly and the battery cell.

[0009] In some embodiments, the protective member comprises one; alternatively, the protective member comprises multiple members, and the multiple members are arranged along the circumference of the first insulating portion. In the above technical solution, the provision of multiple protective members can guide the electrode assembly in the circumferential direction when it is inserted into the casing and protect the insulating member, which is conducive to further improving the reliability and stability of the electrode assembly and battery cells.

[0010] In some embodiments, the protective member is disposed on at least one side of the first insulating portion in the longitudinal direction, and the width of the protective member is smaller than the width of the first insulating portion. This configuration reduces the risk of the protruding sharp portion of the protective member being bent and scratching the insulating member when the electrode assembly wrapped with the insulating member is installed into the housing, and reduces the risk of the housing being corroded, thereby further improving the reliability and stability of the electrode assembly and battery cell.

[0011] In some embodiments, the distance between the protective member and the edge of the same side of the first insulating portion in the width direction is greater than zero and less than half the thickness of a single battery cell of the electrode assembly, or is equal to half the thickness of a single battery cell of the electrode assembly. In the above technical solution, the protective member can, on the one hand, cover the area between the middle arc corners of the two outermost battery cells, reducing the risk of the protective member being caught in the groove between two adjacent battery cells. On the other hand, it can reduce the risk of the protruding sharp portion of the protective member formed after bending and scratching the insulating member, reducing the risk of corrosion of the shell, thereby further improving the reliability and stability of the electrode assembly and battery cells.

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

[0013] In some embodiments, the explosion-proof valve is located on a wall of the housing opposite the first insulating portion, and the vent is formed in the first insulating portion. In this technical solution, during the process of installing the electrode assembly wrapped with the insulating member into the housing, the first insulating portion can gradually approach the explosion-proof valve along the direction of insertion until the vent aligns with the explosion-proof valve. This reduces the chance of the explosion-proof valve damaging the first insulating portion, 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 cells.

[0014] In some embodiments, the pole includes a first pole, and the first pole is arranged on the wall of the shell body opposite to the shell cover. The first insulating part is located on the side of the insulating part close to the first pole, and the first insulating part is provided with an avoidance hole, and the avoidance hole is used for the conductive part to pass through so that the conductive part can be connected to the first pole. In the above technical solution, by providing an avoidance hole on the first insulating part, the conductive part can be avoided. On the one hand, it can reduce the damage to the conductive part by the first insulating part, and on the other hand, it is convenient for the conductive part to be electrically connected to 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 speed up the infiltration speed of the electrolyte.

[0015] In some embodiments, the terminal includes two first terminals of opposite polarity, and the first insulating portion has two avoidance holes. The two first terminals are disposed on the same side of the housing and can be electrically connected to the conductive portions of the two avoidance holes on the first insulating portion, respectively, making connection more convenient and facilitating improved assembly efficiency of the battery cells.

[0016] In some embodiments, the insulating member further comprises: a main insulating portion, the main insulating portion wrapping around the circumference of the active material coating portion, the protective member stacked on the outside of the main insulating portion; a second insulating portion, the second insulating portion being arranged at an end of the main insulating portion away from the first pole and wrapping around the side of the active material coating portion away from the first pole, and the first insulating portion being arranged on a side of the main insulating portion close to the first pole. The insulating member is composed of multiple parts, and the multiple parts can wrap around the circumference and both ends of the active material coating portion, and can completely separate the active material coating portion from the shell, so as to fully reduce the exposure of the active material coating portion, reduce the risk of failure and damage of the electrode assembly, reduce the risk of corrosion of the shell, and improve the reliability and stability of the battery cell.

[0017] In some embodiments, the main body insulating portion includes a plurality of main body portions; the plurality of main body portions are connected end to end in a ring shape, the plurality of main body portions are wrapped together around the circumference of the active material coating portion, and any two adjacent main body portions are connected by a first adhesive tape, and the first insulating portion and the second insulating portion are respectively located at the axial ends of the ring structure formed by the plurality of main body portions. After the plurality of main body portions are connected, they are in a ring shape, which can completely wrap around the circumference of the active material coating portion, so that the circumference of the active material coating portion is completely separated 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, so that the axial ends of the active material coating portion are completely separated 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. The first adhesive tape connection method is used instead of the hot melt connection method. On the one hand, it can save thermal fuses and reduce material costs. On the other hand, it does not require structures such as hot melt connection equipment, which can simplify the connection steps and further reduce production costs.

[0018] 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.

[0019] 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; 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 the 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.

[0020] In some embodiments, the middle portion of the first tape is bonded to the outside of two adjacent flanges and the two ends are bonded to the outside of two adjacent main surfaces, and the protective member is stacked on the outside of the first tape. In the above technical solution, the first tape connects the two adjacent main surfaces and the two adjacent flanges together. On the one hand, it can shape the two adjacent main parts so that the two main parts can be kept in a folded state that fits the circumference of the active material coating part. On the other hand, it increases the connection area between the first tape and the two adjacent main parts, improves the connection reliability between the two, and can fully ensure that the two adjacent main parts can be wrapped around at least a portion of the circumference of the active material coating part, fully reducing the exposure of the active material coating part and reducing the risk of corrosion of the shell, thereby further improving the reliability and stability of the electrode assembly and the battery cell; the protective member is stacked on the outside of the first tape, so that the protective member can play a role in guiding and protecting the insulating member, facilitating the installation of the electrode assembly into the shell, reducing the chance of the shell scratching the insulating member, fully reducing the exposure of the active material coating part and reducing the risk of corrosion of the shell, thereby further improving the reliability and stability of the electrode assembly and the battery cell.

[0021] In some embodiments, the widths of the two adjacent flanges in two adjacent main bodies are unequal, with the smaller flange located outside the wider flange. This arrangement facilitates the use of the first adhesive tape to connect both adjacent flanges in the two adjacent main bodies, making the connection between the two adjacent flanges less susceptible to separation or disconnection. This reduces the probability and risk of insulation failure at the overlapping location, improves the reliability of the electrode assembly, and ultimately enhances the stability and reliability of the battery cell.

[0022] In some embodiments, in two adjacent main body portions, the width ratio of the two adjacent flanges is 1 / 3-2 / 3. By limiting the width ratio of the two adjacent flanges to meet the above conditions, when the smaller flange is stacked outside the larger flange, a portion of the larger flange can be exposed. This facilitates the simultaneous connection of the first tape to the two adjacent flanges, thereby reducing the probability and risk of insulation failure at the overlapping position, improving the reliability of the electrode assembly, and thus improving the stability and reliability of the battery cell.

[0023] In some embodiments, the active material coating portion has four sides; the main body insulating portion includes two main bodies disposed on either side of the first insulating portion, namely a first main body and a second main body. The first main body includes a first main surface and first and second flanges disposed on either side of the first main surface. The second main body includes a second main surface and third and fourth flanges disposed on either side of the second main surface. The first flange is connected to the third flange, and the second flange is connected to the fourth flange. The first main surface, the connecting structure of the first flange and the third flange, and the second main surface, the connecting structure of the second flange and the fourth flange respectively wrap around the four sides of the active material coating portion. When the active material coating portion has four sides, the battery cell is generally square. In this case, the first and second main bodies, as well as their connecting structure, can completely wrap around the four sides of the active material coating portion, completely isolating the four sides of the active material coating portion from the inner wall of the housing, reducing the risk of leakage of the active material coating portion and significantly improving the reliability and stability of the square battery cell.

[0024] In some embodiments, the first flange and the third flange partially overlap and are connected by a first tape, the middle portion of the first tape is bonded to the outside of the first flange and the third flange, and the two ends are bonded to the outside of the first main surface and the second main surface; the second flange and the fourth flange partially overlap and are connected by a first tape, the middle portion of the first tape is bonded to the outside of the second flange and the fourth flange, and the two ends are bonded to the outside of the first main surface and the second main surface; the protective member is stacked on the outside of the first tape. In the above technical solution, one of the first adhesive tapes can connect the first main body surface, the second main body surface, the first flange and the third flange together, and the other first adhesive tape can connect the first main body surface, the second main body surface, the second flange and the fourth flange together. On the one hand, the first main body and the second main body can be shaped so that the first main body and the second main body can be kept in a folded state that fits the circumference of the active material coating part. On the other hand, the connection area between the first adhesive tape and the first main body and the second main body is increased, thereby improving the connection reliability between the two, and fully ensuring that the first main body and the second main body can be wrapped around the circumference of the active material coating part, fully reducing the exposure of the active material coating part, and reducing the risk of corrosion of the shell, thereby further improving the reliability and stability of the electrode assembly and the battery cell; the two protective parts can play the role of guiding and protecting the insulating parts, making it convenient to install the electrode assembly into the shell, reducing the chance of the shell scratching the insulating parts, fully reducing the exposure of the active material coating part, and reducing the risk of corrosion of the shell, thereby further improving the reliability and stability of the electrode assembly and the battery cell.

[0025] In some embodiments, the second insulating portion includes a plurality of insulating sub-parts, and the plurality of insulating sub-parts are connected to the main body surfaces of the plurality of main body parts in a one-to-one correspondence, and any two adjacent insulating sub-parts are connected by a second adhesive tape. In the process of installing the electrode assembly into the shell, the first insulating part enters the shell first, and the second insulating part enters the shell last. During this process, the insulating part can enter the shell along the shell entry direction, and the shell will not scrape the edge of the insulating part, reducing the movement and slippage of the insulating part; after the electrode assembly is installed in place in the shell, the protective part is located between the shell and the main insulating part of the insulating part, further reducing the phenomenon of corrosion of the shell due to leakage of the active material coating part, and facilitating installation; any two adjacent insulating sub-parts are connected by a second adhesive tape. Using the second adhesive tape connection method instead of the hot melt connection method can save thermal fuses and reduce material costs on the one hand, and 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.

[0026] In some embodiments, a portion of the second tape is bonded to the outside of two adjacent insulating sections and another portion is bonded to the outside of two adjacent flanges. In the above technical solution, the second tape can connect the two adjacent insulating sections and the two adjacent flanges together. On the one hand, it can shape the two adjacent main bodies and the second insulating section, so that the two main bodies and the second insulating section can be better maintained in a folded state that fits the active material coating section. On the other hand, it increases the connection area between the second tape and the two adjacent main bodies and the second insulating section, improving the connection reliability, fully ensuring that the two adjacent main bodies and the second insulating section can wrap the active material coating section, fully reducing the exposure of the active material coating section, and reducing the risk of corrosion of the shell, thereby further improving the reliability and stability of the electrode assembly and battery cell.

[0027] 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.

[0028] In some embodiments, the widths of two adjacent insulating segments are unequal, with the smaller insulating segment located outside the wider insulating segment. This arrangement facilitates the use of the second adhesive tape to connect both adjacent insulating segments in the second insulating portion, making the connection between the two adjacent insulating segments less susceptible to separation or disconnection. This reduces the probability and risk of insulation failure at the overlapping location, improves the reliability of the electrode assembly, and ultimately enhances the stability and reliability of the battery cell.

[0029] In some embodiments, in two adjacent insulating sections, chamfered structures are formed at both ends of the insulating section located on the outside, so that the insulating section located on the inside can expose more area, increase the connection area between the second tape and the insulating section located on the inside, further reduce the probability and risk of insulation failure at the overlapping position of the two, and be more conducive to improving the reliability of the electrode assembly, so as to improve the stability and reliability of the battery cell; in two adjacent flanges, a chamfered structure is formed at one end located on the outside and close to the insulating section, that is, a chamfered structure is formed at one end of the flange located on the outside close to the insulating section, 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, which can further reduce the probability and risk of insulation failure at the overlapping position of the two, and be more conducive to improving the reliability of the electrode assembly, so as to improve the stability and reliability of the battery cell.

[0030] In some embodiments, each main body portion has a notch at the connection between the main surface and the flange; and / or each insulating sub-section has a notch at the connection between the corresponding main surface. In the above technical solution, on the one hand, the provision of the notch facilitates folding of the insulating member to smoothly wrap around the active material coating portion, thereby improving production and manufacturing efficiency and saving production and manufacturing costs. On the other hand, such a configuration can reduce errors in the process of wrapping the insulating member around the active material coating portion, thereby improving the accuracy and reliability of the insulating member wrapping, thereby further improving the stability and reliability of the battery cell.

[0031] In some embodiments, the main body insulating portion and the first insulating portion are notched at their connection locations; and / or the main body insulating portion and the second insulating portion are notched at their connection locations. In the above technical solution, on the one hand, the provision of the notches facilitates folding of the insulating member to smoothly wrap the active material coating portion, thereby improving production and manufacturing efficiency and saving production and manufacturing costs. On the other hand, such a configuration can reduce errors in the process of wrapping the insulating member around the active material coating portion, thereby improving the accuracy and reliability of the insulating member wrapping, thereby further improving the stability and reliability of the battery cell.

[0032] 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.

[0033] In some embodiments, the plurality of liquid through holes are spaced apart in the length direction of the main insulating portion, and the sum of the dimensions of the plurality of liquid through holes in the length direction of the main insulating portion is less than half the length of the main insulating portion, so as to minimize the impact on the strength of the insulating portion while making the insulating portion have the effect of being immersed in electrolyte.

[0034] In some embodiments, the distance between the liquid through hole and the second insulating portion is 1 mm-8 mm to improve the wetting effect of the insulating member.

[0035] 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.

[0036] In some embodiments, there are multiple poles and at least one is a first pole, there are multiple conductive parts and at least one is a first conductive part; the battery cell further includes a bracket, the bracket is disposed within the shell and is located between the first pole and the active material coating part, the bracket has a via for exposing the first conductive part so that the first conductive part is connected to the first pole. In the above technical solution, after the electrode assembly and the bracket are installed in place within the shell, the bracket is located between the active material coating part of the electrode assembly and the wall of the shell opposite to the opening, and the first insulating part is pressed between the bracket and the active material coating part, which can further separate the active material coating part from the wall of the shell, reduce the risk of shell corrosion, and improve the reliability and stability of the battery cell.

[0037] In some embodiments, the electrode post includes two first electrode posts, and the bracket has two through-holes. During the process of installing the electrode assembly into the housing, the two conductive portions of the electrode assembly can be simultaneously and correspondingly passed through the two through-holes of the bracket, thereby facilitating electrical connection between the conductive portions and the corresponding first electrode posts, making the connection more convenient and improving the assembly efficiency of 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 a cross-sectional view of a battery structure provided by 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 top view of the structure shown in FIG5;

[0048] FIG7 is a side view of the structure shown in FIG5 at one viewing angle;

[0049] FIG8 is a side view of the structure shown in FIG5 at another viewing angle;

[0050] FIG9 is a schematic structural diagram of an insulating member and a protective member of a battery provided in some embodiments of the present application;

[0051] FIG10 is a schematic diagram of the assembly process of the electrode assembly, the insulating member, and the protective member of the battery according to some embodiments of the present application;

[0052] FIG11 is a schematic diagram of the assembly process of the electrode assembly, the insulating member, and the protective member of the battery according to some embodiments of the present application;

[0053] FIG12 is a schematic diagram of the assembly process of the electrode assembly, insulating member, and protective member of a battery according to some embodiments of the present application.

[0054] The accompanying drawings in the specific implementation manner are as follows:

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

[0056] First direction Z, second direction X, third direction Y,

[0057] Battery cell 10, box body 20, first part 201, second part 202,

[0058] Shell 11, shell body 111, opening 1110, shell cover 112, pole 12, first pole 121,

[0059] Electrode assembly 2, active material coating portion 21, conductive portion 22, first conductive portion 221,

[0060] Bracket 3, via 311,

[0061] 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,

[0062] Protective member 5 , first adhesive tape 61 , second adhesive tape 62 . DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] 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.

[0066] References herein to "embodiments" 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.

[0067] 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.

[0068] 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).

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In the related art, a battery cell generally includes a shell body with an opening, a shell cover, an electrode assembly, an insulating part and a plastic part. The electrode assembly is arranged in the shell body, and a pole is provided on the shell cover. The electrode assembly is electrically connected to the pole. The plastic part is arranged on the side of the shell cover close to the pole to provide insulation. The insulating part is covered on the bottom of the electrode assembly away from the shell cover, as well as the peripheral side of the electrode assembly, and is connected to the plastic part to ensure insulation between the electrode assembly and the shell, thereby ensuring the normal charging and discharging process of the battery.

[0073] However, when the electrode assembly of the above structure is installed into the shell, the insulating part is prone to wrinkles and curling of the edges due to friction with the shell, and may even easily fall off the plastic part, causing the electrode assembly to leak, making the electrode assembly contact with the inner wall surface of the shell, causing the shell to be corroded, and affecting the reliability of the battery cell.

[0074] In view of this, in order to solve the above problems, the present application provides a battery cell including a shell, an electrode assembly, an insulating part and a protective part. The protective part is arranged on at least one side of the circumferential side of the first insulating part of the insulating part. It can guide and protect the insulating part during the process of the electrode assembly being installed into the shell, making it convenient to install the electrode assembly wrapped with the insulating part into the shell, reducing the chance of the shell scratching the insulating part. After the electrode assembly is installed into the shell, the protective part can further isolate the active material coating part from the shell, fully reducing the leakage of the active material coating part, and reducing the risk of corrosion of the shell, so as to further improve the reliability and stability of the electrode assembly and the battery cell.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a 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.

[0082] 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.

[0083] 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 a cross-sectional view of the structure of a battery 100 provided in some embodiments of the present application. A battery cell 10 is the smallest unit that makes up 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.

[0084] 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.

[0085] The shell body 111 is a component used to cooperate with the shell cover 112 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 2, 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.

[0086] The electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur. The number of electrode assemblies 2 can be one or more. 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 can 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.

[0087] 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.

[0088] 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 an insulating member 4 that surrounds the circumference of the electrode assembly 2 and includes a first insulating portion 42 that covers the side of the electrode assembly 2 facing away from the opening 1110.

[0089] The battery cell 10 further includes a protective member 5 , which is disposed on at least one side of the circumference of the first insulating portion 42 . The protective member 5 is located between the insulating member 4 and the housing 11 .

[0090] 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 the role of 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.

[0091] In the technical solution of the embodiment of the present application, a protective part 5 is provided on at least one side of the circumference of the first insulating part 42. On the one hand, the protective part 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 part 4, reducing the probability of the shell 11 scratching the insulating part 4, and reducing the movement and sliding of the insulating part 4. On the other hand, after the electrode assembly 2 is installed into the shell 11, the protective part 5 is located between a part of the insulating part 4 and the shell 11, which can further isolate the active material coating part 21 from the shell 11, and cooperate with the insulating part 4 to achieve double insulation, fully reducing the leakage of the active material coating part 21, and reducing the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0092] 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.

[0093] 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.

[0094] Referring again to FIG5 and further to FIG6 , FIG6 is a top view of the structure shown in FIG5 . The first insulating portion 42 has a length direction (the X direction shown in the figure) and a width direction (the Y direction shown in the figure). The protective member 5 is disposed on at least one side of the length direction of the first insulating portion 42. The width m1 of the protective member 5 is smaller than the width m2 of the first insulating portion 42.

[0095] With such an arrangement, when the electrode assembly 2 wrapped with the insulating part 4 is installed into the shell 11, the risk of the protruding sharp portion formed after the protective part 5 is bent and scratching the insulating part 4 can be reduced, and the risk of the shell 11 being corroded can be reduced, thereby further improving the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0096] As an optional embodiment, the distance S between the protective member 5 and the edge of the first insulating part 42 in the width direction is greater than zero and less than half the thickness of a single battery cell of the electrode assembly 2, or equal to half the thickness of a single battery cell of the electrode assembly 2.

[0097] In the above technical solution, on the one hand, the protective member 5 can cover the area between the middle arc corners of the two outermost battery cells, reducing the risk of the protective member 5 being caught in the groove between the two adjacent battery cells. On the other hand, it can reduce the risk of the protruding sharp part formed after the protective member 5 is bent and scratching the insulating member 4, and reduce the risk of the shell 11 being corroded, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0098] The electrode assembly 2 may include two battery cells, and the distance S between the protective member 5 and the same side edge of the first insulating portion 42 in the width direction may be greater than zero and less than half the thickness of the battery cell. For example, the distance S between the protective member 5 and the same side edge of the first insulating portion 42 in the width direction may be greater than the thickness of the battery cell and less than 1.5 times the thickness of the battery cell. Of course, the electrode assembly 2 may also include three or more battery cells.

[0099] Referring again to Figure 6 , housing 11 is provided with an explosion-proof valve (not shown), and insulating member 4 further includes an air vent 421 corresponding to the position of the explosion-proof valve. Providing air vent 421 in insulating member 4 allows the explosion-proof valve to communicate with air vent 421, allowing the explosion-proof valve to properly vent and release pressure.

[0100] As an optional embodiment, the explosion-proof valve is located on the wall of the housing 11 opposite to the first insulating portion 42 , and the air vent 421 is opened in the first insulating portion 42 .

[0101] In the above technical solution, during the process of installing the electrode assembly 2 wrapped with the insulating part 4 into the shell 11, the first insulating part 42 can move along the shell entry direction to gradually approach the explosion-proof valve until the air vent 421 corresponds to the explosion-proof valve, thereby reducing the probability of the explosion-proof valve 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.

[0102] The number of the air holes 421 may be one or more. In an embodiment where the number of the air holes 421 is multiple, the multiple air holes 421 may be disposed in the middle of the length direction of the first insulating portion 42 and spaced apart in the length direction of the first insulating portion 42 .

[0103] Please refer again to Figures 5 and 6, and further to Figures 7 and 8. Figure 7 is a side view of the structure shown in Figure 5 from one perspective. Figure 8 is a side view of the structure shown in Figure 5 from another perspective. The pole 12 includes a first pole 121, which is disposed on the wall of the shell body 111 opposite to the shell cover 112. The first insulating portion 42 is located on the side of the insulating member 4 near the first pole 121. The first insulating portion 42 is provided with an avoidance hole 422 for the conductive portion 22 to pass through the avoidance hole 422 to enable the conductive portion 22 to connect with the first pole 121.

[0104] 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.

[0105] As an optional solution, as shown in FIG7 , the pole 12 includes two first poles 121 with opposite polarities, one of which is a positive pole and the other is a negative pole, and two avoidance holes 422 are provided on the first insulating portion 42 .

[0106] 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.

[0107] Please refer again to Figures 5 and 6, and further to Figure 9, which is a schematic diagram of the structure of the insulating member and protective member of the battery provided in some embodiments of the present application. The insulating member 4 also includes a main body insulating portion 41 and a second insulating portion 43. The main body insulating portion 41 is wrapped around the circumference of the active material coating portion 21. The protective member 5 is stacked on the outside of the main body insulating portion 41. The second insulating portion 43 is arranged at the end of the main body insulating portion 41 away from the first pole 121. The second insulating portion 43 wraps the side of the active material coating portion 21 away from the first pole 121. The first insulating portion 42 is arranged on the side of the main body insulating portion 41 close to the first pole 121.

[0108] The insulating part 4 is composed of multiple parts, and the multiple parts can cover the surrounding side and two ends of the active material coating part 21, and can completely 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, reduce the risk of failure and damage of the electrode assembly 2, reduce the risk of corrosion of the shell 11, and improve the reliability and stability of the battery cell 10.

[0109] 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.

[0110] 5 and 6 , the main insulating portion 41 includes a plurality of main portions 410 , which are connected end to end in a ring shape. The plurality of main portions 410 are wrapped together on the circumferential side of the active material coating portion 21 , and 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 portions 410 .

[0111] 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.

[0112] 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.

[0113] 5 and 6 , any two adjacent main bodies 410 are connected by a first adhesive tape 61 . The use of the first adhesive tape 61 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.

[0114] 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 adhesive tape 61, 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.

[0115] Further optionally, in an embodiment of the present application, 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 body surface and two flanges arranged on both sides of the main body surface, and any two adjacent main body portions 410 are connected by flanges, and the connection structure of each main body surface and each two flanges respectively wraps different surfaces of the peripheral side of the active material coating portion 21.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] Please refer to Figures 5 and 9 again, and further to Figures 10 to 12. Figure 10 is a schematic diagram of the assembly process of the electrode assembly, insulating parts, and protective parts of the battery in some embodiments of the present application. Figure 11 is a schematic diagram of the assembly process of the electrode assembly, insulating parts, and protective parts of the battery in some embodiments of the present application. Figure 12 is a schematic diagram of the assembly process of the electrode assembly, insulating parts, and protective parts of the battery in some embodiments of the present application. The middle part of the first tape 61 is bonded to the outside of the two adjacent flanges, and the two ends of the first tape 61 are bonded to the outside of the two adjacent main surfaces.

[0120] In the above technical solution, the first tape 61 connects two adjacent main body surfaces and two adjacent flanges together. On the one hand, it can shape the two adjacent main body parts 410 so that the two main body parts 410 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 tape 61 and the two adjacent main body parts 410, improves the connection reliability between the two, and can fully ensure that the two adjacent main body parts 410 can be wrapped in at least a part of 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.

[0121] Among them, the protective part 5 is stacked on the outside of the first tape 61, so that the protective part 5 can play the role of protecting the insulating part 4, making it convenient to install the electrode assembly 2 into the shell 11, reducing the chance of the shell 11 scratching the insulating part 4, and fully reducing the exposure of the active material coating part 21, 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.

[0122] As an optional embodiment, as shown in FIG9 , in two adjacent main body portions 410 , the widths of the two adjacent flanges are unequal, and the flange with the smaller width is located outside the flange with the larger width.

[0123] Such a configuration facilitates the use of the first tape 61 to connect with the two adjacent flanges in the two adjacent main body parts 410, so that the connection position of the two adjacent flanges 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, thereby improving the stability and reliability of the battery cell 10.

[0124] Specifically, in two adjacent main body portions 410, the width of the smaller flange of the two adjacent flanges is L1, the width of the larger flange is L2, and the width ratio L1 / L2 of the two adjacent flanges is 1 / 3-2 / 3. For example, the width ratio L1 / L2 of the two adjacent flanges can be 1 / 3, 5 / 12, 1 / 2, 7 / 12, 2 / 3, etc.

[0125] In the above technical solution, the above conditions are met by limiting the width ratio of two adjacent flanges. When the flange with a smaller width is stacked on the outside of the flange with a larger width, a portion of the flange with a larger width can be exposed. This makes it convenient for the first tape 61 to connect the two adjacent flanges at the same time, thereby reducing the probability and risk of insulation failure at the overlapping position of the two, and improving the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0126] 9 to 12 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.

[0127] 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.

[0128] 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 .

[0129] 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.

[0130] 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.

[0131] Referring again to Figures 9 and 12, the first flange 4112 and the third flange 4122 partially overlap and are connected by a first adhesive tape 61. The middle portion of the first adhesive tape 61 is bonded to the outsides of the first and third flanges 4112, 4122, and the ends of the first adhesive tape 61 are bonded to the outsides of the first and second main surfaces 4111, 4121. The second flange 4113 and the fourth flange 4123 partially overlap and are connected by a first adhesive tape 61. The middle portion of the first adhesive tape 61 is bonded to the outsides of the second and fourth flanges 4113, 4123, and the ends of the first adhesive tape 61 are bonded to the outsides of the first and second main surfaces 4111, 4121.

[0132] In the above technical solution, one of the first adhesive tapes 61 can connect the first main body surface 4111, the second main body surface 4121, the first flange 4112 and the third flange 4122 together, and the other first adhesive tape 61 can connect the first main body surface 4111, the second main body surface 4121, the second flange 4113 and the fourth flange 4123 together. On the one hand, 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 61 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.

[0133] The protective member 5 is stacked on the outside of the first adhesive tape 61. Specifically, the protective member 5 may include two protective members 5, which are respectively provided on opposite sides of the first insulating portion 42, one of which is stacked on the outside of the first adhesive tape 61 outside the first flange 4112 and the third flange 4122, and the other protective member 5 is stacked on the outside of the first adhesive tape 61 outside the second flange 4113 and the fourth flange 4123.

[0134] The two protective parts 5 can guide and protect the insulating part 4, making it convenient to install the electrode assembly 2 into the shell 11, reducing the chance of the shell 11 scratching the insulating part 4, fully reducing the leakage of the active material coating part 21, and reducing the risk of corrosion of the shell 11, so as to further improve the reliability and stability of the electrode assembly 2 and the battery cell 10.

[0135] Referring again to FIG. 9 , the second insulating portion 43 includes a plurality of insulating sub-portions 430 . The plurality of insulating sub-portions 430 are connected to the main surfaces of the plurality of main portions 410 in a one-to-one correspondence.

[0136] 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 .

[0137] 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, reducing the movement and slippage 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 the active material coating part 21 corroding the shell 11 due to leakage, and the installation is convenient.

[0138] Please refer to Figures 9 and 12 again. Any two adjacent insulating sections 430 are connected by the second tape 62. The use of the second tape 62 instead of the hot melt connection method can save thermal fuses and reduce material costs. On the other hand, it does not require structures such as hot melt connection equipment, which can simplify the connection steps and further reduce production costs.

[0139] Part of the second adhesive tape 62 is bonded to the outer sides of two adjacent insulating sections 430 , and another part of the second adhesive tape 62 is bonded to the outer sides of two adjacent flanges.

[0140] In the above technical solution, the second tape 62 can connect the two adjacent insulating sections 430 and the two adjacent flanges together. On the one hand, it can shape the two adjacent main bodies 410 and the second insulating part 43, 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, it increases the connection area between the second tape 62 and the two adjacent main bodies 410 and the second insulating part 43, improves the connection reliability, and 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.

[0141] Please refer to Figure 9 again. Any two adjacent insulating sections 430 have partial overlap, making it difficult to separate the two adjacent insulating sections 430. This 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, reduce the risk of corrosion of the shell 11, and improve the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0142] 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.

[0143] Such a configuration facilitates the use of the second tape 62 to connect with 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.

[0144] Please refer to Figure 9 again. Among the two adjacent insulating sections 430, the two ends of the insulating section 430 located on the outside form a chamfered structure, so that the insulating section 430 located on the inside can expose more area, increase the connection area between the second tape 62 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.

[0145] 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, thereby increasing the connection area between the second tape 62 and the flange located on the inside, which can further reduce the probability and risk of insulation failure at the overlapping position of the two, and is more conducive to improving the reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0146] 9 and 10 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.

[0147] 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.

[0148] 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.

[0149] 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 .

[0150] 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.

[0151] Please refer to Figures 9 and 10 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.

[0152] 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.

[0153] When the insulating member 4 is used to wrap the electrode assembly 2, first, as shown in FIG10, the first insulating portion 42 of the insulating member 4 can be covered on one end of the active material coating portion 21 located on the pole 12. Then, as shown in FIG11, the first main body portion 411 and the second main body portion 412 of the insulating member 4 are bent respectively according to the first notch 401a, so that the first main surface 4111 of the first main body portion 411 and the second main surface 4121 of the second main body portion 412 respectively cover the two oppositely arranged large surfaces of the active material coating portion 21. Then, as shown in FIG12, 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 61 is used to connect the end of the first flange 4112 of the first main body portion 411 close to the first insulating portion 42 and the end of the third flange 4122 of the second main body portion 412 close to the first insulating portion 42. Together, the first flange 4112 and the third flange 4122 cover a small surface on the side of the active material coating part 21, and another first tape 61 is used to connect the end of the second flange 4113 of the first main body 411 close to the first insulating part 42 and the end of the fourth flange 4123 of the second main body 412 close to the first insulating part 42, and the second flange 4113 and the fourth flange 4123 cover another small surface on the side of the active material coating part 21; then, according to the third notch 401c, the two insulating sections 430 of the second insulating part 43 are bent respectively, and a second tape 62 is used to connect the end of the first flange 4112 and the third flange 4122 close to the second insulating part 43 with the two insulating sections 430, and another second tape 62 is used to connect the second flange 4113 and the end of the fourth flange 4123 close to the second insulating part 43 with the two insulating sections 430. The entire insulating member 4 is bent multiple times along the notches 401 to cover the active material coating portion 21 .

[0154] Referring again to Figures 5 and 9-12 , the main insulating portion 41 has a plurality of spaced-apart liquid-through holes 410 a near the second insulating portion 43. These holes 410 a increase the fluidity of the electrolyte, increasing the contact area between the electrolyte and the active material coating 21 and mitigating the problem of poor wetting of the active material coating 21.

[0155] 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.

[0156] As an optional embodiment, please refer to Figure 9 again. The multiple liquid holes 410a are arranged at intervals in the length direction of the main insulating part 41, and the sum of the dimensions of the multiple liquid holes 410a in the length direction of the main insulating part 41 is less than half of the length L of the main insulating part 41. On the basis of making the insulating part 4 have the effect of being immersed in electrolyte, the impact on the strength of the insulating part 4 is minimized as much as possible.

[0157] In order to improve the wetting effect of the insulating member 4, the distance h between the liquid hole 410a and the second insulating part 43 can be set to 1mm-8mm. For example, the distance h between each liquid hole 410a and the second insulating part 43 can be 1mm, 2mm, 5mm, 6mm, or 8mm.

[0158] In some specific embodiments, the distance h between the liquid hole 410a and the second insulating portion 43 is 3 mm to 5 mm. Thus, after the electrode assembly 2 with the insulating member 4 is installed in the housing 11, the distance h between the liquid hole 410a and the housing cover 112 is 3 mm to 5 mm, which helps further improve the wetting effect of the insulating member 4.

[0159] Please refer to Figure 4 and Figure 12 again. There are multiple poles 12, at least one of which is a first pole 121. There are multiple conductive parts 22, at least one of which is a first conductive part 221. The 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 part 21. The bracket 3 has a through hole 311, and the first conductive part 221 can be exposed from the through hole 311 to facilitate the connection between the first conductive part 221 and the first pole 121.

[0160] In the above technical solution, after the electrode assembly 2 and the bracket 3 are installed in place in the shell 11, the bracket 3 is located between the active material coating part 21 of the electrode assembly 2 and the wall of the shell 11 opposite to the opening 1110, and the first insulating part 42 is pressed between the bracket 3 and the active material coating part 21, which can further separate the active material coating part 21 from the wall of the shell 11, reduce the risk of corrosion of the shell 11, and improve the reliability and stability of the battery cell 10.

[0161] As an optional solution, the pole 12 includes two first poles 121, and the bracket 3 has two through-holes 311. 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 311 of the bracket 3, facilitating electrical connection between the conductive portions 22 and the corresponding first poles 121. This makes the connection more convenient and helps improve the assembly efficiency of the battery cell 10.

[0162] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 10 of any of the above solutions.

[0163] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell 10 , the reliability and stability of the battery 100 can be improved.

[0164] According to some embodiments of the present application, the present application further provides an electric device 1000 , comprising the battery cell 10 of any of the above solutions, or comprising the battery 100 of the above solutions, and the battery 100 is used to provide electrical energy for the electric device 1000 .

[0165] The power-consuming device 1000 may be any of the aforementioned devices or systems using the battery 100 .

[0166] 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.

[0167] 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, characterized in that: include: A shell body, wherein the shell body is provided with a pole, and comprises a shell cover and a shell body having an opening, wherein the shell cover covers the opening; An electrode assembly, comprising a conductive portion and an active material coating portion disposed in the shell, wherein the conductive portion electrically connects the active material coating portion and the electrode column; an insulating member, covering the circumference of the electrode assembly and comprising a first insulating portion covering a side of the electrode assembly away from the opening; The protective member is disposed on at least one side of the circumference of the first insulating portion and is located between the insulating member and the housing.

2. The battery cell according to claim 1, characterized in that: The protective member includes one; or, the protective member includes a plurality of protective members, and the plurality of protective members are arranged along the circumferential direction of the first insulating portion.

3. The battery cell according to claim 1, characterized in that: The protection member is disposed on at least one side of the first insulating portion in a length direction, and a width of the protection member is smaller than a width of the first insulating portion.

4. The battery cell according to claim 3, characterized in that: The distance between the protective member and the same side edge of the first insulating portion in the width direction is greater than zero and less than half the thickness of a single battery cell of the electrode assembly, or equal to half the thickness of a single battery cell of the electrode assembly.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The shell is provided with an explosion-proof valve, and the insulating member also has a vent hole corresponding to the position of the explosion-proof valve.

6. The battery cell according to claim 5, characterized in that: The explosion-proof valve is located on a wall of the housing opposite to the first insulating portion, and the air vent is provided in the first insulating portion.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The pole includes a first pole, which is arranged on a wall of the shell body opposite to the shell cover, the first insulating portion is located on a side of the insulating member close to the first pole, and an avoidance hole is opened on the first insulating portion, and the avoidance hole is used for the conductive portion to pass through so that the conductive portion can be connected to the first pole.

8. The battery cell according to claim 7, characterized in that: The pole comprises two first poles with opposite polarities, and the first insulating portion is provided with two avoidance holes.

9. The battery cell according to claim 7, characterized in that: The insulating member further comprises: a main body insulating portion, the main body insulating portion wrapping around the active material coating portion, the protective member stacked on the outside of the main body insulating portion; The second insulating part is arranged at one end of the main insulating part away from the first pole and wraps the side of the active material coating part away from the first pole. The first insulating part is arranged on the side of the main insulating part close to the first pole.

10. The battery cell according to claim 9, characterized in that: The main insulating part includes multiple main parts; the multiple main parts are connected end to end in sequence to form a ring shape, the multiple main parts are wrapped together on the circumference of the active material coating part and any two adjacent main parts are connected by a first tape, and the first insulating part and the second insulating part are respectively located at the axial ends of the ring structure formed by the multiple main parts.

11. The battery cell according to claim 10, characterized in that: The connection positions of any two adjacent main bodies are partially overlapped.

12. The battery cell according to claim 10, characterized in that: The peripheral side of the active material coating portion has a plurality of surfaces; Each of the main body parts includes a main body surface and two flanges arranged on both sides of the main body surface, any two adjacent main body parts are connected by the flanges, and the connection structure of each main body surface and every two flanges respectively wraps different surfaces of the peripheral side of the active material coating part.

13. The battery cell according to claim 12, characterized in that: The middle portion of the first adhesive tape is bonded to the outer sides of two adjacent flanges and the two ends are bonded to the outer sides of two adjacent main body surfaces, and the protective member is stacked on the outer side of the first adhesive tape.

14. The battery cell according to claim 12, characterized in that: In two adjacent main body parts, the widths of the two adjacent flanges are unequal, and the flange with a smaller width is located outside the flange with a larger width.

15. The battery cell according to claim 14, characterized in that: In two adjacent main body parts, the width ratio of two adjacent flanges is 1 / 3-2 / 3.

16. The battery cell according to any one of claims 12 to 15, characterized in that: The peripheral side of the active material coating portion has four surfaces; The main body insulating part includes two main bodies arranged on both sides of the first insulating part, namely a first main body and a second main body, the first main body includes a first main body surface and a first flange and a second flange arranged on both sides of the first main body surface, the second main body includes a second main body surface and a third flange and a fourth flange arranged on both sides of the second main body surface, the first flange is connected to the third flange, and the second flange is connected to the fourth flange; The first main body surface, the connection structure of the first flange and the third flange, the second main body surface, and the connection structure of the second flange and the fourth flange respectively wrap four surfaces sequentially arranged on the peripheral side of the active material coating portion.

17. The battery cell according to claim 16, characterized in that: The first flange and the third flange are partially overlapped and connected by a first adhesive tape, the middle portion of the first adhesive tape is bonded to the outside of the first flange and the third flange, and the two ends of the first adhesive tape are bonded to the outside of the first main body surface and the second main body surface; The second flange and the fourth flange are partially overlapped and connected by a first adhesive tape, the middle portion of the first adhesive tape is bonded to the outer sides of the second flange and the fourth flange, and the two ends of the first adhesive tape are bonded to the outer sides of the first main body surface and the second main body surface; The protection member is stacked on the outside of the first adhesive tape.

18. The battery cell according to any one of claims 12 to 17, characterized in that: The second insulating portion includes a plurality of insulating sub-portions, and the plurality of insulating sub-portions are connected to the main body surfaces of the plurality of main body portions in a one-to-one correspondence, and any two adjacent insulating sub-portions are connected by using a second adhesive tape.

19. The battery cell according to claim 18, characterized in that: A portion of the second adhesive tape is bonded to the outer sides of two adjacent insulating sections and another portion of the second adhesive tape is bonded to the outer sides of two adjacent flanges.

20. The battery cell according to claim 18, characterized in that: Any two adjacent insulating sections partially overlap.

21. The battery cell according to claim 20, characterized in that: The widths of the two adjacent insulating sections are unequal, and the insulating section with the smaller width is located outside the insulating section with the larger width.

22. The battery cell according to claim 20, characterized in that: In two adjacent insulating sections, two ends of the insulating section located on the outside form chamfered structures; In the two adjacent flanges, one end located on the outside and close to the insulating portion forms a chamfered structure.

23. The battery cell according to any one of claims 18 to 22, characterized in that: A connection position between the main surface of each main body portion and the flange is notched; and / or a connection position between the insulating portion and the corresponding main surface is notched.

24. The battery cell according to any one of claims 9 to 23, characterized in that: A connection position between the main body insulating portion and the first insulating portion has a notch; and / or a connection position between the main body insulating portion and the second insulating portion has a notch.

25. The battery cell according to any one of claims 9 to 24, characterized in that: A plurality of fluid passage holes arranged at intervals are provided on the main body insulating part at a position close to the second insulating part.

26. The battery cell according to claim 25, characterized in that: The plurality of liquid through holes are arranged at intervals in the length direction of the main body insulating portion, and the sum of sizes of the plurality of liquid through holes in the length direction of the main body insulating portion is less than half of the length of the main body insulating portion.

27. The battery cell according to claim 25, characterized in that: The distance between the liquid through hole and the second insulating part is 1 mm-8 mm.

28. The battery cell according to claim 27, characterized in that: The distance between the liquid through hole and the second insulating part is 3mm-5mm.

29. The battery cell according to any one of claims 7 to 28, characterized in that: There are multiple poles and at least one pole is a first pole, and there are multiple conductive parts and at least one conductive part is a first conductive part; The battery cell further includes a bracket, which is disposed in the shell and between the first pole and the active material coating portion. The bracket has a via hole for exposing the first conductive portion so as to connect the first conductive portion to the first pole.

30. The battery cell according to claim 29, characterized in that The pole includes two first poles, and the bracket is provided with two through holes.

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

32. An electrical device, characterized in that: Comprising the battery cell according to any one of claims 1-30; or comprising the battery according to claim 31.

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