Battery cell, battery, energy storage device and electrical device

Abstract

Disclosed in the present application are a battery cell, a battery, an energy storage device and an electrical device. The battery cell comprises a casing, a first electrode terminal and a first insulating member. The casing is provided with a first wall. The first electrode terminal comprises a first flange, the first flange being located on the inner side of the first wall. In the direction of thickness of the first wall, at least part of the first insulating member is located between the first flange and the first wall. In the direction of thickness of the first wall, the projection of the first flange falls within the projection of the first insulating member. The technical solution provided in the present application can effectively improve the reliability of the battery.

Description

Battery cell, battery, energy storage device and electric device Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 202420714188.5, filed on April 8, 2024, entitled “Battery cell, battery, energy storage device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular, relates to a battery cell, a battery, an energy storage device and an electric device. BACKGROUND

[0003] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the development of battery technology, how to improve the reliability of the battery is a technical problem that needs to be solved in battery technology. SUMMARY

[0005] The present application provides a battery cell, a battery, an energy storage device and an electric device. The technical scheme provided by the present application can effectively improve the reliability of the battery.

[0006] In a first aspect, the present application provides a battery cell. The battery cell includes a housing, a first electrode terminal and a first insulating member. The housing has a first wall. The first electrode terminal includes a first flange, and the first flange is located on the inner side of the first wall. At least part of the first insulating member is located between the first flange and the first wall along the thickness direction of the first wall. Wherein, the projection of the first flange along the thickness direction of the first wall falls within the projection of the first insulating member.

[0007] In the above scheme, by arranging the first insulating member between the first flange of the first electrode terminal and the first wall, and making the projection of the first insulating member in the thickness direction of the first wall completely fall within the first insulating member, the first wall and the first flange can be effectively insulated and isolated, reducing the electrical connection between the first electrode terminal and the inner surface of the first wall, thereby reducing the risk of internal short circuit of the battery cell, and further making the battery have higher reliability.

[0008] According to some embodiments of the present application, the first flange has a first surface facing the first wall along the thickness direction of the first wall, and the first insulating member covers the entire first surface.

[0009] In the above scheme, by arranging the first insulating member between the first flange of the first electrode terminal and the first wall and covering the entire first surface of the first flange, the first wall and the first flange can be effectively insulated and isolated, the risk of internal short circuit of the battery cell caused by electrical connection between the first electrode terminal and the inner surface of the first wall can be reduced, and the reliability of the battery can be improved.

[0010] According to some embodiments of the present application, the first flange includes oppositely arranged first and second surfaces along the thickness direction of the first wall, and the outer circumferential surface of the first flange connects the first and second surfaces. The first insulating member covers at least a portion of the outer circumferential surface of the first flange.

[0011] In the above scheme, by covering at least a portion of the outer circumferential surface of the first flange with the first insulating member, the creepage distance between the first wall and the first flange can be effectively improved, the high-voltage resistance between the first wall and the first flange can be effectively improved, the risk of internal short circuit of the battery cell caused by electrical connection between the first electrode terminal and the inner surface of the first wall can be effectively reduced, and the reliability of the battery can be improved.

[0012] According to some embodiments of the present application, the first insulating member covers the entire outer circumferential surface of the first flange.

[0013] In the above scheme, by arranging the first insulating member to cover the entire outer circumferential surface of the first flange, the creepage distance between the first wall and the first flange can be effectively improved, the high-voltage resistance between the first wall and the first flange can be effectively improved, the risk of internal short circuit of the battery cell caused by electrical connection between the first electrode terminal and the inner surface of the first wall can be effectively reduced, and the reliability of the battery can be improved.

[0014] According to some embodiments of the present application, the first wall is provided with a first electrode lead-out hole, the first electrode terminal is arranged through the first electrode lead-out hole, and the first insulating member is at least partially located between the outer circumferential surface of the first electrode terminal and the hole wall of the first electrode lead-out hole.

[0015] In the above scheme, by arranging at least a portion of the first insulating member between the outer circumferential surface of the first electrode terminal and the hole wall of the first electrode lead-out hole, the first electrode terminal and the first wall can be effectively insulated and isolated, the risk of internal short circuit of the battery cell caused by electrical connection between the first electrode terminal and the first wall can be effectively reduced, and the reliability of the battery can be improved.

[0016] According to some embodiments of the present application, the first electrode terminal further comprises a first terminal body, the first wall is provided with a first electrode lead-out hole, and the first terminal body is arranged through the first electrode lead-out hole. The first insulating piece comprises a first insulating portion, a second insulating portion and a third insulating portion. In the radial direction of the first terminal body, the first insulating portion is located between the outer circumferential surface of the first terminal body and the hole wall of the first electrode lead-out hole. In the thickness direction of the first wall, the second insulating portion is located between the first flange and the first wall. The third insulating portion covers at least a portion of the outer circumferential surface of the first flange.

[0017] In the above scheme, the first insulating piece comprises a first insulating portion, a second insulating portion and a third insulating portion. By arranging the first insulating portion, the first terminal body and the hole wall of the first electrode lead-out hole can be effectively insulated and isolated. By arranging the second insulating portion, the first surface and the inner surface of the first wall can be effectively insulated and isolated. By arranging the third insulating portion, the creepage distance between the first wall and the first flange can be improved, the high-voltage resistance between the first wall and the first flange can be effectively improved, the risk of electrical connection between the first electrode terminal and the inner surface of the first wall can be effectively reduced, the risk of internal short circuit of the battery monomer can be caused, and the reliability of the battery can be improved.

[0018] According to some embodiments of the present application, the first insulating portion, the second insulating portion and the third insulating portion are integrally formed.

[0019] In the above scheme, by arranging the first insulating portion, the second insulating portion and the third insulating portion to be integrally formed, the first insulating piece can have high structural strength, thereby effectively insulating and isolating the first electrode terminal and the first wall, reducing the electrical connection between the first electrode terminal and the inner surface of the first wall, causing the risk of internal short circuit of the battery monomer, and improving the reliability of the battery.

[0020] According to some embodiments of the present application, the second insulating portion comprises a first part and a second part, the first part is connected with the first insulating portion, and the second part is connected with the third insulating portion; in the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part.

[0021] In the above scheme, by arranging the thickness of the first part of the second insulating portion to be greater than the thickness of the second part, the first insulating piece assembled between the first wall and the first electrode terminal is compressed to form a good sealing surface, thereby reducing the risk of leakage of electrolyte inside the battery monomer between the first terminal body and the hole wall of the first electrode lead-out hole, and improving the reliability of the battery.

[0022] According to some embodiments of the present application, the second insulating portion comprises a first part and a second part arranged separately, the first part is integrally formed with the first insulating portion, and the second part is integrally formed with the third insulating portion.

[0023] In the above scheme, the first insulating piece is a split structure, including a first part and a first insulating part integrally formed, and a second part and a third insulating part integrally formed, which can reduce the difficulty of assembling the first insulating piece between the first wall and the first electrode terminal, improve the assembly efficiency of the battery monomer, and further improve the manufacturing efficiency of the battery.

[0024] According to some embodiments of the present application, along the thickness direction of the first wall, the projection of the first part and the projection of the second part have an overlapping area.

[0025] In the above scheme, by setting the first part and the second part to be overlapped and misaligned, on the one hand, the first part and the second part can effectively cover the first surface, improving the insulation and voltage resistance performance of the first wall and the first surface, and on the other hand, a sealing surface with good sealing effect can be formed between the first part and the second part, reducing the risk of electrolyte in the battery monomer entering the gap between the first part and the second part, causing internal short circuit of the battery monomer, and making the battery have higher reliability.

[0026] According to some embodiments of the present application, the second part and the third insulating part are an insulating coating coated on the first flange.

[0027] In the above scheme, by setting the second part and the third insulating part as an insulating coating, on the one hand, the insulating protection effect can be achieved, reducing the risk of internal short circuit of the battery monomer; on the other hand, the influence of the first insulating piece on the mass energy density and volume energy density of the battery monomer can be reduced, so that the battery has higher mass energy density and volume energy density; on the other hand, the insulating coating can be formed on the first flange through a simple process, so that the manufacturing efficiency of the battery monomer can be effectively improved, and the manufacturing efficiency of the battery can be further improved.

[0028] According to some embodiments of the present application, the first electrode terminal further includes a first electrical connection piece, and the first electrical connection piece is located on the outside of the first wall. The battery monomer further includes a second insulating piece, and at least a part of the second insulating piece is arranged between the first electrical connection piece and the first wall along the thickness direction of the first wall, for insulating and isolating the first electrical connection piece and the first wall.

[0029] In the above scheme, by arranging the second insulating piece between the first wall and the first electrical connection piece, the first wall and the first electrical connection piece can be effectively insulated and isolated, the risk of internal short circuit of the battery monomer caused by short circuit between the first wall and the first electrical connection piece can be reduced, and the reliability of the battery is high. In particular, in the energy storage device with high working voltage, by arranging the second insulating piece between the first wall and the first electrical connection piece, the risk of thermal runaway of the energy storage device caused by the high-voltage electricity of the shell due to the out-of-control of the remaining battery monomers in the battery, which leads to the conduction of the high-voltage electricity to the first wall and the electrode terminal, causing the internal short circuit of the battery monomer, can be effectively reduced.

[0030] According to some embodiments of the present application, the second insulation piece has a resistance value greater than or equal to 200 megaohms.

[0031] In the above scheme, by setting the resistance value of the second insulation piece to be greater than or equal to 200 megaohms, the insulation withstand voltage between the first electrode terminal and the first wall can be effectively improved, the insulation withstand voltage requirement of the energy storage device can be effectively met, the risk of the battery monomer short circuit caused by the external voltage breaking through the second insulation piece to conduct the first wall and the first electrode terminal can be reduced, and the energy storage device has higher reliability.

[0032] According to some embodiments of the present application, the battery monomer further comprises a first deformation piece electrically connected with the first wall, and the first deformation piece is configured to be deformed to contact the first electrode terminal to electrically connect the first electrode terminal with the first wall.

[0033] In the above scheme, by setting the first deformation piece, when the internal pressure of the battery monomer reaches a certain degree, for example, a first threshold value, the first deformation piece is deformed to contact the first electrode terminal, so that the first electrode terminal is electrically connected with the first wall, the internal short circuit of the battery monomer is realized, the electric connection component in the battery monomer is melted due to the large current generated by the short circuit, the charging and discharging circuit of the battery monomer is cut off, the overcharge protection function is realized, the risk of thermal runaway of the battery monomer is reduced, and the battery has higher reliability.

[0034] According to some embodiments of the present application, the battery monomer further comprises a second electrode terminal and a second deformation piece, the second electrode terminal is insulatedly installed on the first wall, and the second deformation piece is electrically connected with the first wall and is configured to be deformed to contact the second electrode terminal to electrically connect the second electrode terminal with the first wall.

[0035] In the above scheme, by setting the second deformation piece, when the internal pressure of the battery monomer reaches a certain degree, for example, a second threshold value, the second deformation piece is deformed to contact the second electrode terminal, so that the second electrode terminal is electrically connected with the second wall, and the first deformation piece is short-circuited with the first electrode terminal, so that the electric connection component in the battery monomer is melted due to the large current generated by the short circuit, the charging and discharging circuit of the battery monomer is cut off, the overcharge protection function is realized, the risk of thermal runaway of the battery monomer is reduced, and the battery has higher reliability.

[0036] In a second aspect, some embodiments of the present application provide a battery comprising the battery monomer provided in the first aspect.

[0037] In a third aspect, some embodiments of the present application provide an energy storage device comprising the battery monomer provided in the first aspect.

[0038] In a fourth aspect, some embodiments of the present application provide a power utilization device, comprising the battery cell provided in the first aspect, and the battery cell is configured to provide electric energy.

[0039] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0041] FIG. 1 is a schematic diagram of a vehicle in some embodiments of the present application;

[0042] FIG. 2 is a schematic diagram of an energy storage device in some embodiments of the present application;

[0043] FIG. 3 is a perspective exploded view of a battery in some embodiments of the present application;

[0044] FIG. 4 is a perspective exploded view of a battery cell in some embodiments of the present application;

[0045] FIG. 5 is a perspective exploded view of a partial structure of a battery cell in some embodiments of the present application;

[0046] FIG. 6 is a top view of a partial structure of a battery cell in some embodiments of the present application;

[0047] FIG. 7 is a sectional view along the A-A direction in FIG. 6;

[0048] FIG. 8 is a schematic diagram of a first electrode terminal, a first insulating member, and a first wall in some embodiments of the present application;

[0049] FIG. 9 is a schematic diagram of a first insulating member in some embodiments of the present application;

[0050] FIG. 10 is a schematic diagram of a first insulating member and a first electrode terminal in some other embodiments of the present application;

[0051] FIG. 11 is a schematic diagram of a first deformation member in some embodiments of the present application;

[0052] FIG. 12 is a schematic diagram of a first wall and a first electrode terminal in some embodiments of the present application;

[0053] FIG. 13 is a schematic diagram of a third insulating member in some embodiments of the present application;

[0054] Fig. 14 is a schematic view of a third insulating member and a second electrode terminal in some embodiments of the present application;

[0055] Fig. 15 is a schematic view of a second deformation member in some embodiments of the present application.

[0056] Fig. 14 is a schematic view of a third insulating member and a second electrode terminal in some embodiments of the present application;

[0057] 100 - battery; 10 - battery cell; 11 - case; 110 - housing; 111 - first wall; 1110 - first electrode lead-out hole; 1111 - second electrode lead-out hole; 1112 - first through hole; 1113 - second through hole; 12 - electrode assembly; 120 - first tab; 121 - first adapter; 123 - second tab; 122 - second adapter; 13 - first electrode terminal; 130 - first terminal body; 131 - first flange; 1310 - first surface; 1311 - second surface; 132 - first electrical connection; 14 - first insulating member; 14a - first assembly hole; 140 - first insulating portion; 141 - second insulating portion; 1410 - first part; 1411 - second part; 142 - third insulating portion; 15 - second insulating member; 15a - first mounting hole; 15b - second mounting hole; 150 - first sub-insulating portion; 151 - second sub-insulating portion; 152 - third sub-insulating portion; 16 - first deformation member; 160 - first skirt; 161 - first flip foil; 162 - first electrical connection portion; 17 - second electrode terminal; 170 - second terminal body; 171 - second flange; 1710 - third surface; 1711 - fourth surface; 172 - second electrical connection; 18 - second deformation member; 180 - second skirt; 181 - second flip foil; 182 - second electrical connection portion; 19 - third insulating member; 190 - fourth insulating portion; 191 - fifth insulating portion; 1910 - third part; 1911 - fourth part; 192 - sixth insulating portion; 20 - fourth insulating member; 20a - third mounting hole; 20b - fourth mounting hole; 200 - fourth sub-insulating portion; 201 - fifth sub-insulating portion; 202 - sixth sub-insulating portion; z - thickness direction of the first wall; x1 - radial direction of the first terminal body; x2 - radial direction of the second terminal body; 30 - box body; 31 - first box portion; 32 - second box portion; 2000 - energy storage device; 2001 - cabinet; 1000 - vehicle; 200 - controller; 300 - motor. DETAILED DESCRIPTION

[0058] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0061] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exists. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0063] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0064] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0065] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] In the present application, the battery cell can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a rectangular parallelepiped or other shapes, etc. The embodiments of the present application are also not limited thereto. The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally includes a box 30 for packaging one or more battery cells. The box 30 can to some extent avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell.

[0067] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly 12 is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement (e.g. deintercalation) of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode current collector that has been coated with the positive electrode active material layer, and the positive electrode current collector that is not coated with the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode current collector that has been coated with the negative electrode active material layer, and the negative electrode current collector that is not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure to some extent that fusing does not occur when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0068] The battery cell further includes a shell, the electrode assembly and the electrolyte are arranged inside the shell. The shell has a first wall, the first wall is provided with an electrode terminal, the electrode terminal is connected with the electrode assembly, and the electrode terminal is used for input and output of electric energy.

[0069] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge-discharge rate. In addition, the reliability of the battery also needs to be considered. During the abuse process of overcharging and heating, the electrolyte inside the battery cell volatilizes due to high temperature, which may cause the electrode terminal and the inner surface of the first wall to be connected, resulting in a risk of short circuit of the battery cell. Alternatively, during the transportation process, the electrolyte inside the battery cell flows and infiltrates between the electrode terminal and the inner surface of the first wall, resulting in a risk of short circuit of the battery cell, which causes the battery cell to have low reliability, and further causes the battery to have low reliability.

[0070] In view of this, in order to improve the problem that the inner surface of the first wall and the electrode terminal are short-circuited, resulting in internal short circuit of the battery cell and affecting the reliability of the battery, some embodiments of the present application provide a battery cell. The battery cell includes a shell, a first electrode terminal and a first insulating piece. The shell has a first wall. The first electrode terminal includes a first flange, the first flange is located on the inner side of the first wall, and at least part of the first insulating piece is located between the first flange and the first wall along the thickness direction of the first wall. Wherein, along the thickness direction of the first wall, the projection of the first flange falls within the projection of the first insulating piece.

[0071] In the above scheme, by arranging the first insulating piece between the first flange of the first electrode terminal and the first wall, and making the projection of the first insulating piece in the thickness direction of the first wall completely fall within the first insulating piece, the first wall and the first flange can be effectively insulated and isolated, the risk of electrical connection between the first electrode terminal and the inner surface of the first wall is reduced, resulting in internal short circuit of the battery cell, and further making the battery have high reliability.

[0072] The technical solutions described in the embodiments of the present application are applicable to batteries, energy storage devices using batteries, and electric devices using batteries.

[0073] The energy storage device can include an energy storage container, an energy storage cabinet, etc. Illustratively, the energy storage cabinet can include a cabinet body and one or more batteries arranged on the cabinet body.

[0074] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc.

[0075] The following embodiments are described by taking the electric device as a vehicle for convenience of description.

[0076] FIG. 1 is a schematic diagram of a vehicle according to some embodiments of the present application.

[0077] The vehicle 1000 can be provided with a controller 200, a motor 300, and a battery 100. The controller 200 is configured to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, such as the power demand for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can be used as an operating power source of the vehicle 1000, and can be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Referring to FIG. 2, FIG. 2 is a schematic diagram of an energy storage device according to some embodiments of the present application.

[0079] The energy storage device 2000 can include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 can be arranged in the cabinet 2001. The plurality of batteries 100 can be connected in series, in parallel, or in a hybrid manner.

[0080] Referring to FIG. 3, FIG. 3 is a perspective exploded view of the battery 100 according to some embodiments of the present application.

[0081] The battery 100 includes the battery cell 10 and the case 30, and the battery cell 10 is housed in the case 30. The case 30 is configured to provide a housing space for the battery cell 10, and the case 30 can have various configurations. In some embodiments, the case 30 can include a first case portion 31 and a second case portion 32, and the first case portion 31 and the second case portion 32 are coupled to each other to define a housing space for the battery cell 10. The second case portion 32 can be a hollow structure with one open end, and the first case portion 31 can be a plate structure. The first case portion 31 is coupled to the open end of the second case portion 32 to define the housing space together with the second case portion 32. Alternatively, the first case portion 31 and the second case portion 32 can both be hollow structures with one open end, and the open end of the first case portion 31 is coupled to the open end of the second case portion 32. Of course, the case 30 formed by the first case portion 31 and the second case portion 32 can have various shapes, such as a cylindrical shape or a cuboid shape.

[0082] In the battery 100, the battery cell 10 can be one or a plurality of battery cells, and each battery cell 10 can be fixed to the case 30 by a connecting member (e.g., a bolt) or by adhesion.

[0083] Referring to FIGS. 4-8, FIG. 4 is a perspective exploded view of the battery cell 10 according to some embodiments of the present application, FIG. 5 is a perspective view of a partial structure of the battery cell 10 according to some embodiments of the present application, FIG. 6 is a top view of a partial structure of the battery cell 10 according to some embodiments of the present application, FIG. 7 is a sectional view taken along the A-A direction of FIG. 6, and FIG. 8 is a schematic view of the first electrode terminal 13, the first insulating member 14, and the first wall 111 according to some embodiments of the present application.

[0084] The present application provides a battery cell 10. The battery cell 10 includes a housing 11, a first electrode terminal 13, and a first insulating member 14. The housing 11 has a first wall 111. The first electrode terminal 13 includes a first flange 131, and the first flange 131 is located on an inner side of the first wall 111. At least a portion of the first insulating member 14 is located between the first flange 131 and the first wall 111 in a thickness direction z of the first wall. A projection of the first flange 131 falls within a projection of the first insulating member 14 in the thickness direction z of the first wall.

[0085] The shell 11 is used to accommodate the electrode assembly 12, and can also be used to accommodate an electrolyte, such as an electrolyte solution. Referring to FIG. 4, in some embodiments, the shell 11 includes a shell body 110 and an end cover. The shell body 110 has an accommodating cavity formed therein for accommodating the electrode assembly 12, and has an opening communicating with the accommodating cavity. The end cover is coupled to the opening of the shell body 110 and forms a sealed connection, so as to form a sealed space for accommodating the electrode assembly 12 and the electrolyte solution. The end cover can be coupled to the shell body 110 by welding, bonding, clamping or other coupling manners. Optionally, the shell 11 can also include a bottom plate, and the shell body 110 has two openings formed at two ends thereof, one of which is closed by the end cover and the other of which is closed by the bottom plate.

[0086] In some embodiments, the shell 11 can be made of metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, steel or aluminum alloy. For another example, part of the shell 11 can be made of metal, and the rest can be made of non-metal. For example, the end cover of the shell 11 can be made of metal, and the shell body 110 or other parts of the shell 11 can be made of non-metal.

[0087] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be first placed in the shell body 110, and then the electrolyte solution is filled into the shell body 110, and then the end cover is coupled to the opening of the shell body 110 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be first placed in the shell body 110, and then the end cover is coupled to the opening of the shell body 110, and then the electrolyte solution is filled into the shell body 110 through a filling hole in the end cover, and then the filling hole is closed to complete the assembly of the battery cell 10.

[0088] The shell 11 can have various shapes, such as a cylindrical structure or a prismatic structure. The shape of the shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 has a cylindrical structure, a cylindrical shell 11 can be selected. If the electrode assembly 12 has a flat structure, the shell 11 can be square.

[0089] The first wall 111 is part of the shell 11. The first wall 111 can be used to support the first electrode terminal 13, so that the first electrode terminal 13 is in a stable state to achieve input and output of electric energy. In some embodiments, the first wall 111 can be part of the shell body 110, such as a side wall or a bottom wall of the shell body 110. In some embodiments, the first wall 111 can be the end cover.

[0090] In some embodiments, the first wall 111 is provided with a first electrode lead-out hole 1110. The first electrode lead-out hole 1110 penetrates the first wall 111, so that the inner side of the first wall 111 communicates with the outer side of the first wall 111. The inner side of the first wall 111 is the inside of the shell 11, and the outer side of the first wall 111 is the outside of the shell 11.

[0091] The first electrode terminal 13 is a component mounted on the first wall 111, and is used to electrically connect with the electrode assembly 12, so that current flows into or out of the first tab 120 through the first electrode terminal 13. The first electrode terminal 13 and the first tab 120 have the same polarity. In some embodiments, the first electrode terminal 13 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the first electrode terminal 13 can be connected with the first tab 120 through a first adapter 121. For example, the first tab 120 of the electrode assembly 12 is composed of a plurality of first sub-tabs stacked together, and one end of the first adapter 121 can be welded with the first tab 120, and the other end of the first adapter 121 can be welded with the first electrode terminal 13.

[0092] In some embodiments, referring to FIG. 8, the first electrode terminal 13 includes a first terminal body 130 and a first flange 131. The first terminal body 130 and the first flange 131 are connected with each other. The first terminal body 130 penetrates the first electrode lead-out hole 1110. The first flange 131 protrudes from the outer peripheral surface of the first terminal body 130 along the radial direction x1 of the first terminal body. In some embodiments, the first terminal body 130 and the first flange 131 are an integral structure. The first terminal body 130 can be a structure penetrating the first electrode lead-out hole 1110, and the first flange 131 can be a structure protruding from the outer peripheral surface of the first terminal body 130.

[0093] In other embodiments, the first terminal body and the first flange 131 can be a split structure, and are connected by welding, bonding, riveting, or other connection methods.

[0094] In some embodiments, “the first terminal body 130 penetrates the first electrode lead-out hole 1110” can be understood as one end of the first terminal body 130 being located inside the shell 11 and the other end being located outside the shell 11, i.e., both ends of the first terminal body 130 are located on both sides of the first wall 111. The end of the first terminal body 130 located on the inner side of the first wall 111 is used to connect the first tab 120, and the end of the first terminal body 130 located on the outer side of the first wall 111 is used to connect an external bus component. The shape of the first terminal body 130 is not limited, and can be a cylindrical body, a polygonal column, or other special-shaped column. Optionally, the shape of the first terminal body 130 is a cylindrical body.

[0095] The radial direction x1 of the first terminal body can be a direction perpendicular to the central axis of the first terminal body 130, or a direction perpendicular to the thickness direction z of the first wall.

[0096] In some embodiments, the first flange 131 is a protrusion provided on the outer circumferential surface of the first terminal body 130, i.e., the first flange 131 protrudes from the outer circumferential surface of the first terminal body 130 in the radial direction x1 of the first terminal body. The first flange 131 is located at one end of the first terminal body 130 on the inner side of the first wall 111, and directly or indirectly abuts against the first wall 111 to prevent the first terminal body 130 from moving outward of the first wall 111 to a certain extent, so as to prevent the first terminal body 130 from moving away from the electrode assembly 12 and the first wall 111. The first terminal body 130 and the first flange 131 can be integrally formed, or can be two parts separately formed and connected by welding, bonding or the like. Alternatively, the first flange 131 and the first terminal body 130 are integrally formed.

[0097] The first insulating member 14 is a structural member having insulating properties. The phrase “the projection of the first flange 131 falls within the projection of the first insulating member 14 in the thickness direction z of the first wall” can be understood as that the first insulating member 14 can effectively insulate and separate the first flange 131 and the first wall 111 in the thickness direction z of the first wall. For example, the first flange 131 has a first surface 1310 facing the first wall 111, and the first insulating member 14 can at least cover the first surface 1310 to insulate and separate the first surface 1310 and the inner surface of the first wall 111. For another example, the first insulating member 14 is provided on the inner surface of the first wall 111, so that the projection of the first flange 131 on the inner surface of the first wall 111 is located in the region where the first insulating member 14 is located.

[0098] In some embodiments, the first insulating member 14 can be an integral structure, and in other embodiments, the first insulating member 14 can also be composed of a plurality of separate structures.

[0099] For example, the manufacturing material of the first insulating member 14 can include polyphenylene sulfide, polypropylene, polyethylene and other materials having insulating properties. For another example, the first insulating member 14 includes an insulating coating provided on the first flange 131 and an insulating structural member provided between the first flange 131 and the first wall 111.

[0100] In the above scheme, by arranging the first insulating member 14 between the first flange 131 of the first electrode terminal 13 and the first wall 111, and by making the first insulating member 14 cover the entire first surface 1310 of the first flange 131, the first wall 111 and the first flange 131 can be effectively insulated and isolated, the risk of internal short circuit of the battery monomer 10 caused by the electrical connection between the first electrode terminal 13 and the inner surface of the first wall 111 can be reduced, and thus the reliability of the battery 100 can be improved.

[0101] According to some embodiments of the present application, along the thickness direction z of the first wall, the first flange 131 has a first surface 1310 facing the first wall 111, and the first insulating member 14 covers the entire first surface 1310.

[0102] The first surface 1310 is the surface of the first flange 131 facing the first wall 111. In some embodiments, the first surface 1310 indirectly abuts against the inner surface of the first wall 111 through the first insulating member 14, so as to limit the movement of the first electrode terminal 13 along the thickness direction z of the first wall.

[0103] In some embodiments, the portion of the first insulating member 14 can cover the first surface 1310, and the portion of the first insulating member 14 can cover the outer peripheral surface of the first flange 131. In some embodiments, the portion of the first insulating member 14 can cover the first surface 1310, the portion of the first insulating member 14 can cover the outer peripheral surface of the first flange 131, and the portion of the first insulating member 14 can be arranged between the first terminal body 130 and the first electrode lead-out hole 1110.

[0104] According to some embodiments of the present application, referring to FIG. 8, along the thickness direction z of the first wall, the first flange 131 includes oppositely arranged first and second surfaces 1310 and 1311, and the outer peripheral surface of the first flange 131 connects the first and second surfaces 1310 and 1311. The first insulating member 14 covers at least a portion of the outer peripheral surface of the first flange 131.

[0105] In some embodiments, the second surface 1311 is the surface of the first flange 131 facing away from the first wall 111, i.e., the surface of the first flange 131 facing the electrode assembly 12. In some embodiments, the second surface 1311 can be a flat surface.

[0106] The outer peripheral surface of the first flange 131 is the surface of the first flange 131 located between the first and second surfaces 1310 and 1311 along the thickness direction z of the first wall. In some embodiments, when the first flange 131 is in a multi-prism shape, the outer peripheral surface of the first flange 131 includes a plurality of side surfaces. In other embodiments, when the first flange 131 is in a cylindrical shape, the outer peripheral surface of the first flange 131 is in a circular arc shape.

[0107] The "first insulating member 14 covers at least part of the outer circumferential surface of the first flange 131" can be understood as that the first insulating member 14 covers not only the first surface 1310 but also at least part of the first flange 131. Exemplarily, the first insulating member 14 is in a cylindrical shape, the first terminal body 130 passes through the first insulating member 14, and the first insulating member 14 covers the first flange 131, the covered part including the first surface 1310 and the entire outer circumferential surface of the first flange 131, or the covered part including the first surface 1310 and part of the outer circumferential surface of the first flange 131.

[0108] In the above scheme, by covering at least part of the outer circumferential surface of the first flange 131 with the first insulating member 14, the creepage distance between the first wall 111 and the first flange 131 can be effectively improved, the high-voltage resistance between the first wall 111 and the first flange 131 can be effectively improved, the risk of internal short circuit of the battery monomer 10 caused by the electrical connection between the first electrode terminal 13 and the inner surface of the first wall 111 can be effectively reduced, and thus the battery 100 has higher reliability.

[0109] According to some embodiments of the present application, referring to FIG. 8, the first insulating member 14 covers the entire outer circumferential surface of the first flange 131.

[0110] In some embodiments, the entire outer circumferential surface of the first flange 131 is covered by the first insulating member 14.

[0111] In some embodiments, the second surface 1311 can be a flat surface, and along the thickness direction z of the first wall, the plane in which the surface of the first insulating member 14 away from the first wall 111 is located is the same plane as the plane in which the second surface 1311 is located.

[0112] In the above scheme, by setting the first insulating member 14 to cover the entire outer circumferential surface of the first flange 131, the creepage distance between the first wall 111 and the first flange 131 can be effectively improved, the high-voltage resistance between the first wall 111 and the first flange 131 can be effectively improved, the risk of internal short circuit of the battery monomer 10 caused by the electrical connection between the first electrode terminal 13 and the inner surface of the first wall 111 can be effectively reduced, and thus the battery 100 has higher reliability.

[0113] In other embodiments, the first insulating member 14 can also cover at least part of the second surface 1311. Exemplarily, the second surface 1311 is arranged around the end surface of the first terminal body 130, the first insulating member 14 can also cover the entire second surface 1311, and the first tab 120 can be electrically connected to the end surface of the first terminal body 130. Exemplarily, the first insulating member 14 can also cover the edge of the second surface 1311.

[0114] According to some embodiments of the present application, referring to FIG. 8, the first wall 111 is provided with a first electrode lead-out hole 1110, and the first electrode terminal 13 is arranged through the first electrode lead-out hole 1110. The first insulating member 14 is at least partially arranged between the outer circumferential surface of the first electrode terminal 13 and the hole wall of the first electrode lead-out hole 1110.

[0115] In some embodiments, the first electrode terminal 13 comprises a first terminal body 130 and a first flange 131. The first terminal body 130 and the first flange 131 are connected to each other. The first terminal body 130 is arranged through the first electrode lead-out hole 1110. At least part of the first insulating member 14 can be sleeved on the first terminal body 130 and the first flange 131 to insulate and isolate the first electrode terminal and the hole wall of the first electrode lead-out hole 1110.

[0116] In the above scheme, by arranging at least part of the first insulating member 14 between the outer circumferential surface of the first electrode terminal 13 and the hole wall of the first electrode lead-out hole 1110, the first electrode terminal 13 and the first wall 111 can be effectively insulated and isolated, the risk of internal short circuit of the battery monomer 10 caused by the electrical connection between the first electrode terminal 13 and the first wall 111 can be effectively reduced, and the battery has higher reliability.

[0117] According to some embodiments of the present application, the first insulating member 14 is integrally formed.

[0118] In some embodiments, the first insulating member 14 can be integrally formed by processes such as extrusion, injection molding, calendering, blow molding and thermoforming.

[0119] In the above scheme, by arranging the first insulating member 14 to be integrally formed, the first insulating member 14 can have higher structural strength, thereby effectively insulating and isolating the first electrode terminal 13 and the first wall 111, reducing the risk of internal short circuit of the battery monomer 10 caused by the electrical connection between the first electrode terminal 13 and the inner surface of the first wall 111, and thereby making the battery 100 have higher reliability.

[0120] According to some embodiments of the present application, please refer to FIG. 8 and FIG. 9, FIG. 9 is a schematic view of the first insulation member 14 in some embodiments of the present application. The first electrode terminal 13 further comprises a first terminal body 130, and the first wall 111 is provided with a first electrode lead-out hole 1110, and the first terminal body 130 is arranged through the first electrode lead-out hole 1110. The first insulation member 14 comprises a first insulation portion 140, a second insulation portion 141 and a third insulation portion 142. In the radial direction x1 of the first terminal body, the first insulation portion 140 is located between the outer circumferential surface of the first terminal body 130 and the hole wall of the first electrode lead-out hole 1110. In the thickness direction z of the first wall, the second insulation portion 141 is located between the first flange 131 and the first wall 111. The third insulation portion 142 covers at least part of the outer circumferential surface of the first flange 131.

[0121] The first insulation portion 140 is a partial structure of the first insulation member 14. In some embodiments, the first insulation portion 140 is in a cylindrical shape and is arranged in the first electrode lead-out hole 1110, and the first terminal body 130 passes through the first insulation portion 140 to electrically connect with the first tab 120 of the electrode assembly 12. In some embodiments, in the radial direction x1 of the first terminal body, the size of the first insulation portion 140 is greater than the first electrode lead-out hole 1110, the first terminal body 130 passes through the first insulation portion 140, and the first terminal body 130 and the hole wall of the first electrode lead-out hole 1110 jointly extrude the first insulation portion 140, so that the first insulation portion 140 is deformed, thereby achieving a sealing fit between the first insulation portion 140 and the hole wall of the first electrode lead-out hole 1110 and between the first insulation portion 140 and the first terminal body 130.

[0122] The second insulation portion 141 is a partial structure of the first insulation member 14, and is connected with the first insulation portion 140 in the thickness direction z of the first wall.

[0123] In some embodiments, the second insulation portion 141 is in a cylindrical shape, and the first terminal body 130 passes through the second insulation portion 141, so that the second insulation portion 141 is located between the inner surface of the first wall 111 and the first flange 131. In some embodiments, the first wall 111 and the first flange 131 jointly extrude at least part of the second insulation portion 141 to deform at least part of the second insulation portion 141, thereby achieving a sealing fit between the second insulation portion 141 and the inner surface of the first wall 111 and between the second insulation portion 141 and the first flange 131.

[0124] The third insulation portion 142 is a partial structure of the first insulation member 14, and the third insulation portion 142 can be arranged along the edge of the second insulation portion 141 and cover at least part of the outer circumferential surface of the first flange 131.

[0125] In some embodiments, the first insulation portion 140, the second insulation portion 141 and the third insulation portion 142 can be an integral structure. In other embodiments, the first insulation portion 140, the second insulation portion 141 and the third insulation portion 142 can be separate structures. For example, along the thickness direction z of the first wall, the third insulation portion 142 can be sleeved on the outer circumferential surface of the first flange 131. Along the direction of the first wall 111 pointing to the electrode assembly 12, the second insulation portion 141 is assembled to the first surface 1310 corresponding to the first terminal body 130, and the second insulation portion 141 is sleeved on the first terminal body 130.

[0126] In some embodiments, referring to FIG. 9, the first insulation member 14 has a first assembly hole 14a penetrating through the first insulation portion 140, the second insulation portion 141 and the third insulation portion 142, and the first assembly hole 14a is used for the first terminal body 130 to pass through and for accommodating the first flange 131.

[0127] In the above scheme, the first insulation member 14 includes the first insulation portion 140, the second insulation portion 141 and the third insulation portion 142. By providing the first insulation portion 140, the hole wall of the first electrode lead-out hole 1110 can be effectively insulated and isolated from the first terminal body 130. By providing the second insulation portion 141, the first surface 1310 can be effectively insulated and isolated from the inner surface of the first wall 111. By providing the third insulation portion 142, the creepage distance between the first wall 111 and the first flange 131 can be improved, the high-voltage resistance between the first wall 111 and the first flange 131 can be effectively improved, and the electrical connection between the first electrode terminal 13 and the inner surface of the first wall 111 can be effectively reduced, thereby reducing the risk of internal short circuit of the battery monomer 10, and further improving the reliability of the battery 100.

[0128] According to some embodiments of the present application, referring to FIG. 9, the second insulation portion 141 includes a first portion 1410 and a second portion 1411, the first portion 1410 is connected with the first insulation portion 140, and the second portion 1411 is connected with the third insulation portion 142. Along the thickness direction z of the first wall, the thickness of the first portion 1410 is greater than the thickness of the second portion 1411.

[0129] In some embodiments, the second insulation portion 141 is annular, and the second insulation portion 141 includes a first portion 1410 close to the first terminal body 130 and a second portion 1411 away from the first terminal body 130. The first portion 1410 is connected with the first insulation portion 140, and the second portion 1411 is connected with the third insulation portion 142.

[0130] In some embodiments, along the thickness direction z of the first wall, the thickness of the first portion 1410 is greater than the thickness of the second portion 1411.

[0131] In some embodiments, the first portion 1410 and the first insulation part 140 are squeezed by the first wall 111 and the first electrode terminal 13 to deform so that a seal is formed between the first wall 111 and the first electrode terminal 13. The second portion 1411 and the third insulation part 142 mainly function to insulate and separate the first wall 111 and the first flange 131.

[0132] In the above scheme, by setting the thickness of the first portion 1410 of the second insulation part 141 to be greater than the thickness of the second portion 1411, the first insulation part 14 assembled between the first wall 111 and the first electrode terminal 13 is compressed to form a good sealing surface, thereby reducing the risk of leakage of electrolyte inside the battery monomer 10 between the first terminal body 130 and the hole wall of the first electrode lead-out hole 1110, and further improving the reliability of the battery 100.

[0133] According to some other embodiments of the present application, please refer to FIG. 10, which is a schematic view of the first insulation part 14 and the first electrode terminal 13 in some other embodiments of the present application.

[0134] The second insulation part 141 comprises a first portion 1410 and a second portion 1411 which are separately formed. The first portion 1410 is integrally formed with the first insulation part 140, and the second portion 1411 is integrally formed with the third insulation part 142.

[0135] In some embodiments, the second insulation part 141 comprises a first portion 1410 and a second portion 1411 which are separately formed. The first portion 1410 is integrally formed with the first insulation part 140, and the first portion 1410 and the first insulation part 140 can be simultaneously assembled between the first electrode terminal 13 and the first wall 111 during assembly. The second portion 1411 is integrally formed with the third insulation part 142, and the second portion 1411 and the third insulation part 142 can be simultaneously assembled on the first electrode terminal 13 during assembly.

[0136] In some embodiments, the first portion 1410 and the first insulation part 140 can be made of the same material, for example, both are made of plastic material. In some other embodiments, the first portion 1410 and the first insulation part 140 can be made of different materials.

[0137] In some embodiments, the second portion 1411 and the third insulation part 142 can be made of the same material, for example, both are made of plastic material. In some other embodiments, the second portion 1411 and the third insulation part 142 can be made of different materials.

[0138] In some embodiments, the manufacturing materials of the first portion 1410 and the second portion 1411 can be the same or different. For example, the first insulating part 140 and the first portion 1410 are both plastic materials, and the first insulating part 140 and the first portion 1410 can form a plastic ring structure. The third insulating part 142 and the second portion 1411 are both plastic materials, and the third insulating part 142 and the second portion 1411 can form a plastic cylinder structure. For another example, the first insulating part 140 and the first portion 1410 can form a plastic ring structure, and the third insulating part 142 and the second portion 1411 can be an insulating coating coated on the first flange 131.

[0139] In the above scheme, the first insulating part 14 is a split structure, including the first portion 1410 and the first insulating part 140 integrally formed, and the second portion 1411 and the third insulating part 142 integrally formed, which can reduce the difficulty of assembling the first insulating part 14 between the first wall 111 and the first electrode terminal 13, improve the assembly efficiency of the battery monomer 10, and further improve the manufacturing efficiency of the battery 100.

[0140] According to another embodiment of the present application, referring to FIG. 10, along the thickness direction z of the first wall, the projection of the first portion 1410 and the projection of the second portion 1411 have an overlapping area.

[0141] In some embodiments, the first portion 1410 and the second portion 1411 are a split structure, along the thickness direction z of the first wall, the projection of the first portion 1410 and the projection of the second portion 1411 partially overlap, so that part of the first portion 1410 and part of the second portion 1411 are arranged in layers.

[0142] For example, when the first portion 1410 is plastic and the second portion 1411 is an insulating coating, the first portion 1410 can press against the surface of the insulating coating. For another example, when the first portion 1410 is plastic and the second portion 1411 is plastic, the part of the first portion 1410 and the second portion 1411 in contact with each other can be deformed to form a seal.

[0143] In the above scheme, by setting the first portion 1410 and the second portion 1411 to be overlapped and misaligned, on the one hand, the first portion 1410 and the second portion 1411 can effectively cover the first surface 1310, improving the insulation and voltage resistance performance of the first wall 111 and the first surface 1310, and on the other hand, a sealing surface with good sealing effect can be formed between the first portion 1410 and the second portion 1411, reducing the risk of short circuit inside the battery monomer 10 caused by the electrolyte inside the battery monomer 10 entering the gap between the first portion 1410 and the second portion 1411, so that the battery 100 has higher reliability.

[0144] According to some embodiments of the present application, the second portion 1411 and the third insulation portion 142 are insulation coatings coated on the first flange 131.

[0145] In some embodiments, the material of the second portion 1411 and the third insulation portion 142 can include epoxy, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The second portion 1411 and the third insulation portion 142 can be coated on the first flange 131 by processes such as dip coating, spray coating, electroplating, etc.

[0146] In the above scheme, by setting the second portion 1411 and the third insulation portion 142 as insulation coatings, on the one hand, the insulation protection effect can be achieved, and the risk of internal short circuit of the battery monomer 10 can be reduced; on the other hand, the influence of setting the first insulation piece 14 on the mass energy density and the volume energy density of the battery monomer 10 can be reduced, so that the battery 100 has a higher mass energy density and a higher volume energy density; on the other hand, the insulation coating can be formed on the first flange 131 by a simple process, so that the manufacturing efficiency of the battery monomer 10 can be effectively improved, and the manufacturing efficiency of the battery 100 can be improved.

[0147] In some embodiments, the inner surface of the first wall 111 can be coated with an insulation coating.

[0148] According to some embodiments of the present application, please refer to FIG. 5 and FIG. 8, the first electrode terminal 13 further includes a first electrical connection piece 132, and the first electrical connection piece 132 is located on the outer side of the first wall 111. The battery monomer 10 further includes a second insulation piece 15, and at least a portion of the second insulation piece 15 is arranged between the first electrical connection piece 132 and the first wall 111 in the thickness direction z of the first wall, for insulating and isolating the first electrical connection piece 132 and the first wall 111.

[0149] In some embodiments, the first electrical connection piece 132 is connected with the first terminal body 130, and the first electrical connection piece 132 is located on the outer side of the first wall 111 for connecting an external bus component. In some embodiments, the connection relationship between the first electrical connection piece 132 and the first terminal body 130 includes but is not limited to welding, bonding, riveting or threaded connection, etc. In other embodiments, the first electrical connection piece 132 is integrally formed with the first terminal body 130, for example, along the direction of the first wall 111 pointing to the electrode assembly 12, the first terminal body 130 is inserted into the first electrode lead-out hole 1110 and connected with the first flange 131, so that the first terminal body 130 is clamped by the first electrical connection piece 132 and the first flange 131 on the first wall 111.

[0150] In some embodiments, the first electrical connection piece 132 is in a plate shape, and the first electrical connection piece 132 is insulatedly mounted on the outer surface of the first wall 111 by the second insulation piece 15.

[0151] The second insulating member 15 has a high resistance value, and can insulate the first electrode terminal 13 from the first wall 111.

[0152] In some embodiments, the second insulating member 15 corresponds to the first electrode lead hole 1110 and is formed with a first mounting hole 15a for the first electrode terminal 13 to pass through. Optionally, the second insulating member 15 includes a first sub-insulating portion 150, a second sub-insulating portion 151, and a third sub-insulating portion 152. The first sub-insulating portion 150 is located between the first electrical connecting member 132 and the outer surface of the first wall 111, and the first mounting hole 15a is formed on the first sub-insulating portion 150. The second sub-insulating portion 151 is arranged around the first mounting hole 15a and is located between the first terminal body 130 and the hole wall of the first electrode lead hole 1110. The third sub-insulating portion 152 is arranged along the edge of the first sub-insulating portion 150 and surrounds at least part of the outer circumferential surface of the first electrical connecting member 132.

[0153] In some embodiments, the second insulating member 15 can be made of a material with a high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material. For example, in some embodiments of the present application, the material of the second insulating member 15 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the second insulating member 15 can also be made of polypropylene, polyethylene, or other materials with insulating properties.

[0154] In some embodiments, the resistance value of the second insulating member 15 can be in units of megaohms (MΩ). For example, in some embodiments of the battery cell 10 provided by the present application, the resistance value of the second insulating member 15 can be greater than or equal to 200 MΩ. In other embodiments, the resistance value of the second insulating member 15 can be other values, such as 1 MΩ, 10 MΩ, 20 MΩ, 30 MΩ, 40 MΩ, 50 MΩ, 60 MΩ, 70 MΩ, 80 MΩ, 90 MΩ, 100 MΩ, 110 MΩ, 120 MΩ, 130 MΩ, 210 MΩ, 220 MΩ, 230 MΩ, and the like.

[0155] In the above scheme, by arranging the second insulating member 15 between the first wall 111 and the first electrical connecting member 132, the first wall 111 and the first electrical connecting member 132 can be effectively insulated and isolated, and the risk of internal short circuit of the battery monomer 10 caused by short circuit between the first wall 111 and the first electrical connecting member 132 can be reduced, so that the reliability of the battery 100 is high. In particular, in the energy storage device 2000 with high working voltage, by arranging the second insulating member 15 between the first wall 111 and the first electrical connecting member 132, the risk of internal short circuit of the battery monomer 10 caused by high-voltage conduction of the first wall 111 and the electrode terminal due to the out-of-control of the remaining battery monomers 10 in the battery 100 can be effectively reduced, so that the energy storage device 2000 is at risk of thermal runaway.

[0156] According to some embodiments of the present application, the resistance value of the second insulating member 15 is greater than or equal to 200 megaohms.

[0157] In some embodiments, a second insulating member 15 with a resistance value greater than or equal to 200 megaohms can be arranged between the first wall 111 and the first electrical connecting member 132 of the first electrode terminal 13. That is, in some embodiments, the resistance value of the second insulating member 15 can be 200 megaohms, 210 megaohms, 220 megaohms or more.

[0158] In some embodiments, the resistance value of the second insulating member 15 can be measured by a multimeter test method, a bridge measurement method, a voltammetry method, an ohmmeter method, etc. In some embodiments, the resistance value of the second insulating member 15 can be measured by a megaohm meter.

[0159] In the above scheme, by setting the resistance value of the second insulating member 15 to be greater than or equal to 200 megaohms, the insulation and high-voltage resistance between the first electrode terminal 13 and the first wall 111 can be effectively improved, the insulation and pressure resistance requirement of the energy storage device 2000 can be effectively met, and the risk of short circuit of the battery monomer 10 caused by the breakdown of the second insulating member 15 by external voltage to conduct the first wall 111 and the first electrode terminal 13 can be reduced, so that the energy storage device 2000 has high reliability.

[0160] According to some embodiments of the present application, please refer to FIG. 5, FIG. 7 and FIG. 8, the battery monomer 10 further comprises a first deformation member 16, the first deformation member 16 is electrically connected with the first wall 111, and the first deformation member 16 is configured to be deformed to contact the first electrode terminal 13 to electrically connect the first electrode terminal 13 and the first wall 111.

[0161] The first deformation member 16 is mounted on the first wall 111 and electrically connected to the first wall 111. In some embodiments, the first deformation member 16 can be made of metal material, for example, the first deformation member 16 is made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first deformation member 16 can be welded to the inner surface of the first wall 111.

[0162] The first deformation member 16 is a structure member deformed by the internal pressure of the battery cell 10. The first deformation member 16 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse condition such as overcharge, the internal pressure increases, and when the internal pressure reaches a certain level, for example, a first threshold, the first deformation member 16 deforms to contact the first electrode terminal 13, thereby connecting the first wall 111 and the first electrode terminal 13, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0163] In some embodiments, the part of the first deformation member 16 deformed to contact the first electrode terminal 13 can be the part of the first electrode terminal 13 inside the first wall 111, or the part of the first electrode terminal 13 outside the first wall 111, for example, the first deformation member 16 can deform to connect with the first flange 131 or the first terminal body 130 when the internal pressure of the battery cell 10 reaches the first threshold, for example, the first deformation member 16 can deform to connect with the first electrical connector 132 when the internal pressure of the battery cell 10 reaches the first threshold. When the first deformation member 16 can deform to connect with the first electrical connector 132 when the internal pressure of the battery cell 10 reaches the first threshold, the first wall 111 can be formed with a corresponding through hole, so that the first deformation member 16 can pass through the through hole to connect with the first electrical connector 132. At the same time, under normal conditions, the first deformation member 16 can close the through hole.

[0164] In some embodiments, the first deformation member 16 can be a flip sheet that flips under the action of pressure. For example, please refer to FIG. 5 and FIG. 11, FIG. 11 is a schematic view of the first deformation member 16 in some embodiments of the present application.

[0165] The first deformation member 16 has a circular disc-shaped outer contour, which includes a first skirt 160, a first flip foil 161 and a first electrical connection part 162 connected in sequence from outside to inside. The first skirt 160 can be connected to the first wall 111, and the first flip foil 161 has a relatively small thickness and is used to deform and flip under the action of pressure. After the first flip foil 161 flips, the first electrical connection part 162 can be pushed towards the first electrode terminal 13, so that the first electrical connection part 162 contacts the first electrode terminal 13.

[0166] Exemplarily, the first wall 111 has a first through hole 1112, and the first skirt 160 is welded to the inner surface of the first wall 111, so that the first deformation piece 16 closes the first through hole 1112. The first flip foil 161 is in a collapsed state away from the first wall 111 in a natural state, and the first flip foil 161 flips towards the first wall 111 when the internal pressure of the battery cell 10 reaches the first threshold value, so as to push the first electrical connection 162 to make the first electrical connection 162 contact the first electrical connection piece 132 through the first through hole 1112. In some embodiments, the second insulation piece 15 is provided with a second mounting hole 15b corresponding to the first through hole 1112, and the first deformation piece 16 can pass through the second mounting hole 15b to contact the first electrical connection piece 132.

[0167] In some embodiments, the first electrode terminal 13 is electrically connected to the first tab 120 through the first adapter 121, and the second tab 123 of the electrode assembly 12 can be electrically connected to the case 11, and the second tab 123 is opposite in polarity to the first tab 120, for example, the second tab 123 is directly or through the second adapter 122 connected to the case 11, or the case 11 is provided with the second electrode terminal 17, the second electrode terminal 17 is electrically connected to the case 11, and the second tab 123 is directly or through the second adapter 122 connected to the second electrode terminal 17. When the internal pressure of the battery cell 10 reaches the first threshold value, the first deformation piece 16 deforms to short the first electrode terminal 13 and the case 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause internal short circuit, and the large current generated instantaneously can melt the electrical connection member inside the battery cell 10 to cut off the charging and discharging circuit of the battery cell 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 121 and / or the second adapter 122. Exemplarily, the first adapter 121 has a first melting portion, and the overcurrent area of the first melting portion can be smaller than that of the rest of the first adapter 121, so that the first melting portion can be melted when a larger current passes through, thereby breaking the current path of the first tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 122 has a second melting portion, and the overcurrent area of the second melting portion can be smaller than that of the rest of the second adapter 122, so that the second melting portion can be melted when a larger current passes through, thereby breaking the current path of the second tab 123 and the second electrode terminal 17 or the case 11.

[0168] In some embodiments, the first electrode terminal 13 is electrically connected with the first electrode tab 120 through the first adapter 121, the second electrode tab 123 of the electrode assembly 12 can be electrically connected with the second electrode terminal 17, the second electrode tab 123 is opposite in polarity to the first electrode tab 120, the second electrode terminal 17 can be insulatively mounted to the shell 11, for example, insulatively mounted to the first wall 111 of the shell 11. The second electrode tab 123 can be electrically connected with the second electrode terminal 17 through the second adapter 122. The second electrode terminal 17 is correspondingly provided with the second deformation member 18, the second deformation member 18 is electrically connected to the shell 11, and the second deformation member 18 is configured to be deformed to contact the second electrode terminal 17 when the internal pressure of the battery monomer 10 reaches a second threshold value, so as to electrically connect the second electrode terminal 17 with the shell 11.

[0169] When the internal pressure of the battery monomer 10 reaches the first threshold value, the first deformation member 16 is deformed to short the first electrode terminal 13 and the shell 11, and when the internal pressure of the battery monomer 10 reaches the second threshold value, the second deformation member 18 is deformed to short the second electrode terminal 17 and the shell 11, so that the positive and negative electrodes inside the battery monomer 10 are short-circuited to cause internal short-circuit, and a large current generated instantaneously can melt the electrical connection member inside the battery monomer 10 to cut off the charging and discharging circuit of the battery monomer 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 121 and / or the second adapter 122.

[0170] In the above scheme, by providing the first deformation member 16, when the internal pressure of the battery monomer 10 reaches the first threshold value, the first electrode terminal 13 is electrically connected with the first wall 111 by the deformation of the first deformation member 16 to contact the first electrode terminal 13, so as to realize internal short-circuit of the battery monomer 10, so that the electrical connection member inside the battery monomer 10 is melted due to the large current generated by the short-circuit to cut off the charging and discharging circuit of the battery monomer 10, thereby playing a role of overcharge protection and reducing the risk of thermal runaway of the battery monomer 10, and further making the battery 100 have higher reliability.

[0171] According to some embodiments of the present application, the battery monomer 10 further includes a second electrode terminal 17 and a second deformation member 18, the second electrode terminal 17 is insulatively mounted to the first wall 111, and the second deformation member 18 is electrically connected with the first wall 111, and the second deformation member 18 is configured to be deformed to contact the second electrode terminal 17 to electrically connect the second electrode terminal 17 with the first wall 111.

[0172] The second electrode terminal 17 is a component mounted to the first wall 111, and is used to electrically connect with the electrode assembly 12, so as to make current flow into or out of the second tab 123 through the second electrode terminal 17. The second electrode terminal 17 and the second tab 123 have the same polarity. In some embodiments, when the first electrode terminal 13 is a positive electrode terminal, the second electrode terminal 17 is a negative electrode terminal. When the first electrode terminal 13 is a negative electrode terminal, the second electrode terminal 17 is a positive electrode terminal.

[0173] In some embodiments, the second electrode terminal 17 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second electrode terminal 17 can be connected with the second tab 123 through a second adapter 122. For example, the second tab 123 of the electrode assembly 12 is composed of a plurality of second sub-tabs stacked together, and one end of the second adapter 122 can be welded to the second tab 123, and the other end of the second adapter 122 can be welded to the second electrode terminal 17.

[0174] The "second electrode terminal 17 is insulatedly mounted to the first wall 111" can be understood as that the second electrode terminal 17 and the first wall 111 are insulated from each other.

[0175] The second electrode terminal 17 and the first wall 111 are provided with a third insulating member 19, which is used to insulate and separate the second electrode terminal 17 and the inner surface of the first wall 111.

[0176] For example, referring to FIG. 5, FIG. 12 and FIG. 13, FIG. 12 is a schematic view of the first wall 111 and the first electrode terminal 13 in some embodiments of the present application, and FIG. 13 is a schematic view of the third insulating member 19 in some embodiments of the present application. The first wall 111 is provided with a second electrode lead-out hole 1111, and the second electrode terminal 17 includes a second terminal body 170 and a second flange 171. The second terminal body 170 is arranged in the second electrode lead-out hole 1111, and the second flange 171 is located on the inner side of the first wall 111. Along the radial direction x2 of the second terminal body, the second flange 171 protrudes from the outer peripheral surface of the second terminal body 170.

[0177] Along the thickness direction z of the first wall, the second flange 171 has a third surface 1710 facing the first wall 111 and a fourth surface 1711 away from the first wall 111. Along the thickness direction z of the first wall, at least part of the third insulating member 19 is located between the second flange 171 and the first wall 111. The third insulating member 19 is a structural member with insulating properties. The third insulating member 19 can at least cover the third surface 1710, so as to insulate and separate the third surface 1710 from the inner surface of the first wall 111.

[0178] In some embodiments, the third insulating member 19 can cover the third surface 1710 and the outer circumferential surface of the second flange 171. In some embodiments, the third insulating member 19 can cover the third surface 1710 and the outer circumferential surface of the second flange 171, and the third insulating member 19 can be disposed between the second terminal body 170 and the second electrode lead hole 1111.

[0179] In some embodiments, the third insulating member 19 can be a unitary structure, and in other embodiments, the third insulating member 19 can be formed by a plurality of separate structures.

[0180] For example, the third insulating member 19 can be made of polyphenylene sulfide, polypropylene, polyethylene, or other materials having insulating properties. For another example, the third insulating member 19 can include an insulating coating disposed on the second flange 171 and an insulating structure disposed between the second flange 171 and the first wall 111.

[0181] In some embodiments, referring to FIGS. 12 and 13, the third insulating member 19 can include a fourth insulating portion 190, a fifth insulating portion 191, and a sixth insulating portion 192. The fourth insulating portion 190 can be located between the outer circumferential surface of the second terminal body 170 and the hole wall of the second electrode lead hole 1111 along the radial direction x2 of the second terminal body. The fifth insulating portion 191 can be located between the second flange 171 and the first wall 111 along the thickness direction z of the first wall. The sixth insulating portion 192 can cover at least a portion of the outer circumferential surface of the second flange 171.

[0182] In some embodiments, the fourth insulating portion 190 is a partial structure of the third insulating member 19. In some embodiments, the fourth insulating portion 190 is in a cylindrical shape and is disposed in the second electrode lead hole 1111, and the second terminal body 170 passes through the fourth insulating portion 190 to electrically connect with the second tab 123 of the electrode assembly 12. In some embodiments, along the radial direction x2 of the second terminal body, the fourth insulating portion 190 has a size greater than the second electrode lead hole 1111, the second terminal body 170 passes through the fourth insulating portion 190, and the second terminal body 170 and the hole wall of the second electrode lead hole 1111 jointly press the fourth insulating portion 190, so that the fourth insulating portion 190 is deformed to form a sealing fit between the fourth insulating portion 190 and the hole wall of the second electrode lead hole 1111 and between the fourth insulating portion 190 and the second terminal body 170.

[0183] The fifth insulating portion 191 is a partial structure of the first insulating member 14, and the fifth insulating portion 191 and the fourth insulating portion 190 are connected to each other along the thickness direction z of the first wall.

[0184] In some embodiments, the fifth insulation part 191 is in a cylindrical shape, and the second terminal body 170 passes through the fifth insulation part 191, such that the fifth insulation part 191 is located between the inner surface of the first wall 111 and the second flange 171. In some embodiments, the first wall 111 and the second flange 171 jointly extrude at least part of the fifth insulation part 191 to deform at least part of the fifth insulation part 191, so as to seal the fifth insulation part 191 with the inner surface of the first wall 111 and the second flange 171.

[0185] The sixth insulation part 192 is part of the third insulation member 19, and the sixth insulation part 192 can be arranged along the edge of the fifth insulation part 191 and surround and cover at least part of the outer circumferential surface of the second flange 171.

[0186] In some embodiments, the fourth insulation part 190, the fifth insulation part 191 and the sixth insulation part 192 can be integrally formed. In other embodiments, the fourth insulation part 190, the fifth insulation part 191 and the sixth insulation part 192 can be separate structures. For example, along the thickness direction z of the first wall, the sixth insulation part 192 can be sleeved on the outer circumferential surface of the second flange 171. Along the direction of the first wall 111 pointing to the electrode assembly 12, the fifth insulation part 191 is assembled to the third surface 1710 corresponding to the second terminal body 170, and the fourth insulation part 190 is sleeved on the second terminal body 170.

[0187] In other embodiments of the present application, please refer to FIG. 14, which is a schematic view of the third insulation member 19 and the second electrode terminal 17 in some embodiments of the present application.

[0188] The fifth insulation part 191 includes a third part 1910 and a fourth part 1911 arranged separately. The third part 1910 is integrally formed with the fourth insulation part 190, and the fourth part 1911 is integrally formed with the sixth insulation part 192.

[0189] In some embodiments, the fifth insulation part 191 includes a third part 1910 and a fourth part 1911 arranged separately. The third part 1910 is integrally formed with the fourth insulation part 190, and the third part 1910 and the fourth insulation part 190 can be simultaneously assembled between the first electrode terminal 13 and the first wall 111 during assembly. The fourth part 1911 is integrally formed with the sixth insulation part 192, and the fourth part 1911 and the sixth insulation part 192 can be simultaneously assembled on the first electrode terminal 13 during assembly.

[0190] In some embodiments, the third portion 1910 and the fourth insulating part 190 can be made of the same material, for example, both made of plastic. In other embodiments, the third portion 1910 and the fourth insulating part 190 can be made of different materials. In some embodiments, the fourth portion 1911 and the sixth insulating part 192 can be made of the same material, for example, both made of plastic. In other embodiments, the fourth portion 1911 and the sixth insulating part 192 can be made of different materials.

[0191] In some embodiments, the third portion 1910 and the fourth portion 1911 can be made of the same material or different materials. For example, the fourth insulating part 190 and the third portion 1910 are both made of plastic, and the fourth insulating part 190 and the third portion 1910 can form a plastic ring structure. The sixth insulating part 192 and the fourth portion 1911 are both made of plastic, and the sixth insulating part 192 and the fourth portion 1911 can form a plastic cylinder structure. For another example, the fourth insulating part 190 and the third portion 1910 can form a plastic ring structure, and the sixth insulating part 192 and the fourth portion 1911 can be an insulating coating coated on the second flange 171.

[0192] In some embodiments of the present application, the sixth insulating part 192 and the fourth portion 1911 can be an insulating coating coated on the second flange 171. For example, the fourth portion 1911 and the sixth insulating part 192 can be made of epoxy resin, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The sixth insulating part 192 and the fourth portion 1911 can be coated on the second flange 171 by dipping, spraying, electroplating, etc.

[0193] Referring to FIG. 14, along the thickness direction z of the first wall, the projection of the fourth portion 1911 and the projection of the third portion 1910 have an overlapping area. In some embodiments, when the third portion 1910 is made of plastic and the fourth portion 1911 is an insulating coating, the third portion 1910 can press against the surface of the insulating coating.

[0194] In some embodiments of the present application, the fourth insulating part 20 is arranged between the second electrode terminal 17 and the outer surface of the first wall 111, and is used for insulating and isolating the second electrode terminal 17 and the first wall 111.

[0195] For example, referring to FIG. 12, the second electrode terminal 17 further includes a second electrical connecting part 172 connected with the second terminal body 170 and located outside the first wall 111. Along the thickness direction z of the first wall, at least a part of the fourth insulating part 20 is arranged between the second electrical connecting part 172 and the first wall 111, and is used for insulating and isolating the second electrical connecting part 172 and the first wall 111.

[0196] The second electric connecting member 172 is connected with the second terminal body 170, and the second electric connecting member 172 is located outside the first wall 111 for connecting an external bus member. In some embodiments, the connection relationship between the second electric connecting member 172 and the second terminal body 170 includes, but is not limited to, welding, bonding, riveting, or threaded connection, etc. In other embodiments, the second electric connecting member 172 is integrally formed with the second terminal body 170. For example, the second terminal body 170 is inserted into the second electrode lead-out hole 1111 and connected with the second flange 171 in the direction of the first wall 111 pointing to the electrode assembly 12, so that the second terminal body 170 is clamped by the second electric connecting member 172 and the second flange 171 together on the first wall 111.

[0197] In some embodiments, referring to FIG. 5, the second electric connecting member 172 is plate-shaped, and the second electric connecting member 172 is mounted on the outer surface of the first wall 111 through the fourth insulating member 20.

[0198] The fourth insulating member 20 has a high resistance value, which can insulate the second electrode terminal 17 from the first wall 111.

[0199] In some embodiments, the fourth insulating member 20 is formed with a third mounting hole 20a corresponding to the second electrode lead-out hole 1111, so that the second electrode terminal 17 can pass through. Optionally, the fourth insulating member 20 includes a fourth sub-insulating part 200, a fifth sub-insulating part 201, and a sixth sub-insulating part 202. The fourth sub-insulating part 200 is located between the second electric connecting member 172 and the outer surface of the first wall 111, and the third mounting hole 20a is formed on the fourth sub-insulating part 200. The fifth sub-insulating part 201 is arranged around the third mounting hole 20a and located between the second terminal body 170 and the hole wall of the second electrode lead-out hole 1111. The sixth sub-insulating part 202 is arranged along the edge of the fourth sub-insulating part 200 and surrounds at least part of the outer circumferential surface of the second electric connecting member 172.

[0200] In some embodiments, the fourth insulating member 20 can be made of a material with a high resistance value, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material, etc. For example, in some embodiments of the present application, the material of the fourth insulating member 20 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the fourth insulating member 20 can also be made of polypropylene, polyethylene, or other materials with insulating properties.

[0201] In some embodiments, the fourth insulation member 20 can have a resistance value in units of mega-ohm (MΩ). For example, the fourth insulation member 20 can have a resistance value greater than or equal to 200 MΩ in some embodiments of the battery cell 10. In other embodiments, the fourth insulation member 20 can have a resistance value of other values, such as 1 MΩ, 10 MΩ, 20 MΩ, 30 MΩ, 40 MΩ, 50 MΩ, 60 MΩ, 70 MΩ, 80 MΩ, 90 MΩ, 100 MΩ, 110 MΩ, 120 MΩ, 130 MΩ, 210 MΩ, 220 MΩ, 230 MΩ, and the like.

[0202] In some embodiments, the resistance value of the fourth insulation member 20 can be measured by a multimeter test method, a bridge measurement method, a volt-ampere method, an ohmmeter method, and the like. In some embodiments, the resistance value of the fourth insulation member 20 can be measured by a mega-ohmmeter.

[0203] Referring to FIGS. 5, 12, and 15, FIG. 15 is a schematic view of the second deformation member 18 in some embodiments of the present application.

[0204] The second deformation member 18 is installed on the first wall 111 and is electrically connected to the first wall 111. In some embodiments, the second deformation member 18 can be made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the second deformation member 18 can be welded to the inner surface of the first wall 111.

[0205] The second deformation member 18 is a structure member that deforms under the internal pressure of the battery cell 10. The second deformation member 18 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an overcharge or the like abuse condition, the internal pressure increases, and when the internal pressure reaches a second threshold value, the second deformation member 18 deforms to contact the second electrode terminal 17, thereby electrically connecting the first wall 111 and the second electrode terminal 17, cooperating with the first deformation member 16 to electrically connect the first wall 111 and the first electrode terminal 13, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0206] In some embodiments, the first threshold value can be equal to the second threshold value. In other embodiments, the first threshold value can not be equal to the second threshold value. For example, when the second electrode terminal 17 is a negative electrode terminal, the second threshold value can be greater than the first threshold value, so that the second deformation member 18 deforms under a greater pressure.

[0207] In some embodiments, the second deformation member 18 is deformed by pressure to contact the second electrode terminal 17 at a portion of the second electrode terminal 17 inside the first wall 111 or at a portion of the second electrode terminal 17 outside the first wall 111. For example, the second deformation member 18 is deformed to contact the second flange 171 or the second terminal body 170 when the pressure inside the battery cell 10 reaches the second threshold value. For another example, the second deformation member 18 is deformed to contact the second electrical connection 172 when the pressure inside the battery cell 10 reaches the second threshold value. When the second deformation member 18 is deformed to contact the second electrical connection 172 when the pressure inside the battery cell 10 reaches the second threshold value, the first wall 111 can be formed with a corresponding through hole through which the second deformation member 18 can contact the second electrical connection 172. Meanwhile, the second deformation member 18 can close the through hole in normal working conditions.

[0208] For example, referring to FIG. 15, the second deformation member 18 has a disc-shaped outer contour, and includes, from outside to inside, a second skirt 180, a second flip foil 181, and a second electrical connection portion 182 connected in sequence. The second skirt 180 can be connected to the first wall 111. The second flip foil 181 has a small thickness and is used to be deformed and flipped by pressure. After the second flip foil 181 is flipped, the second electrical connection portion 182 is pushed towards the second electrode terminal 17, so that the second electrical connection portion 182 contacts the second electrode terminal 17.

[0209] For example, the first wall 111 has a second through hole 1113. The second skirt 180 is welded to the inner surface of the first wall 111, so that the second deformation member 18 closes the second through hole 1113. The second flip foil 181 is in a collapsed state away from the first wall 111 in a natural state. When the pressure inside the battery cell 10 reaches the second threshold value, the second flip foil 181 is flipped towards the first wall 111 to push the second electrical connection portion 182, so that the second electrical connection portion 182 contacts the second electrical connection 172 through the second through hole 1113. In some embodiments, the fourth insulation member 20 is formed with a fourth mounting hole 20b corresponding to the second through hole 1113. The second deformation member 18 is deformed to contact the second electrical connection 172 through the fourth mounting hole 20b.

[0210] In some embodiments, when the battery cell 10 is in an abuse condition such as overcharge, the pressure inside the battery cell 10 increases, and when the pressure inside the battery cell 10 reaches a first threshold, the first deformation member 16 deforms to short the first electrode terminal 13 and the housing 11, and when the pressure inside the battery cell 10 reaches a second threshold, the second deformation member 18 deforms to short the second electrode terminal 17 and the housing 11, so that the positive and negative electrodes inside the battery cell 10 are shorted to cause an internal short circuit, and a large current generated instantaneously can melt the electrical connection member inside the battery cell 10 to cut off the charge and discharge circuit of the battery cell 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 121 and / or the second adapter 122.

[0211] In the above scheme, by providing the second deformation member 18, when the pressure inside the battery cell 10 reaches the second threshold, the second deformation member 18 deforms to contact the second electrode terminal 17, so that the second electrode terminal 17 is electrically connected to the second wall, in cooperation with the shorting of the first deformation member 16 and the first electrode terminal 13, the electrical connection member inside the battery cell 10 is melted by the large current generated by the short circuit to cut off the charge and discharge circuit of the battery cell 10, thereby playing a role of overcharge protection and reducing the risk of thermal runaway of the battery cell 10, thereby making the battery 100 have higher reliability.

[0212] According to some embodiments of the present application, a battery 100 is also provided, which has the battery cell 10 described above. Referring to FIG. 3, the battery 100 includes the battery cell 10 and a box 30, and the battery cell 10 is accommodated in the box 30. The box 30 is used to provide an accommodation space for the battery cell 10, and the box 30 can adopt various structures.

[0213] In the battery 100, the battery cell 10 can be one or multiple, and each battery cell 10 can be fixed to the box 30 by a connecting member such as a bolt, or each battery cell 10 can be fixed to the box 30 by an adhesive.

[0214] According to some embodiments of the present application, a battery 100 is also provided, which has the battery cell 10 described above. Referring to FIG. 3, the battery 100 includes the battery cell 10 and a box 30, and the battery cell 10 is accommodated in the box 30. The box 30 is used to provide an accommodation space for the battery cell 10, and the box 30 can adopt various structures.

[0215] In some embodiments, the battery cell 10 is first formed into a battery 100, and one or more batteries 100 are then applied to an energy storage device 2000. Referring to FIG. 2, the energy storage device 2000 can include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 can be arranged in the cabinet 2001. The plurality of batteries 100 can be connected in series, in parallel, or in a hybrid manner.

[0216] According to some embodiments of the present application, there is also provided an electric device comprising the battery cell 10 described above. In some embodiments, the battery cell 10 is first configured into a battery 100, and one or more batteries 100 are then applied in the electric device.

[0217] In some embodiments, referring to FIG. 1, the electric device is a vehicle. The interior of the vehicle can be provided with a controller, a motor, and the battery 100, the controller being used to control the battery 100 to supply power to the motor.

[0218] According to some embodiments of the present application, there is provided a battery cell 10, referring to FIGS. 4-15.

[0219] The battery cell 10 comprises a housing 11, an electrode assembly 12, a first electrode terminal 13, a first insulating member 14, a second insulating member 15, a first deforming member 16, a second electrode terminal 17, a third insulating member 19, a fourth insulating member 20, and a second deforming member 18.

[0220] The housing 11 comprises a shell 110 and a first wall 111, which can be an end cover. The shell 110 has an accommodating cavity formed inside, for accommodating the electrode assembly 12, and has an opening communicating with the accommodating cavity, and the end cover closes the opening of the shell 110, so that the electrode assembly 12 is in a closed space.

[0221] The end cover has a first electrode lead-out hole 1110, a second electrode lead-out hole 1111, a first through hole 1112, and a second through hole 1113, which penetrate through the thickness direction of the end cover. The first electrode terminal 13 is installed in the first electrode lead-out hole 1110, and the second electrode terminal 17 is installed in the second electrode lead-out hole 1111. The first deforming member 16 is welded to the inner surface of the end cover and closes the first through hole 1112. The second deforming member 18 is welded to the inner surface of the end cover and closes the second through hole 1113.

[0222] In the thickness direction of the end cover, the first electrode terminal 13 comprises a first electrical connection member 132, a first terminal body 130, and a first flange 131 connected to each other, the first electrical connection member 132 being located on the outer side of the end cover, the first terminal body 130 being provided through the first electrode lead-out hole 1110, and the first flange 131 being located on the inner side of the end cover.

[0223] In the thickness direction of the end cover, the second electrode terminal 17 comprises a second electrical connection member 172, a second terminal body 170, and a second flange 171 connected to each other, the second electrical connection member 172 being located on the outer side of the end cover, the second terminal body 170 being provided through the second electrode lead-out hole 1111, and the second flange 171 being located on the inner side of the end cover.

[0224] Please refer to FIG. 8, along the thickness direction of the end cover, at least part of the first insulating member 14 is located between the first flange 131 and the end cover. The first insulating member 14 includes a first insulating portion 140, a second insulating portion 141 and a third insulating portion 142. Along the radial direction x1 of the first terminal body, the first insulating portion 140 is located between the outer circumferential surface of the first terminal body 130 and the hole wall of the first electrode lead-out hole 1110. Along the thickness direction of the end cover, the second insulating portion 141 is located between the first flange 131 and the end cover. The third insulating portion 142 covers at least part of the outer circumferential surface of the first flange 131.

[0225] In some embodiments, the first insulating member 14 is a one-piece structure, and the first insulating portion 140, the second insulating portion 141 and the third insulating portion 142 are integrally formed plastic structures.

[0226] In other embodiments, the second insulating portion 141 includes a first part 1410 and a second part 1411 arranged separately, the first part 1410 is integrally formed with the first insulating portion 140, and the second part 1411 is integrally formed with the third insulating portion 142. Among them, the first part 1410 and the first insulating portion 140 are integrally formed plastic structures. The second part 1411 and the third insulating portion 142 are insulating coatings coated on the first flange 131.

[0227] Please refer to FIG. 8, along the thickness direction of the end cover, at least part of the second insulating member 15 is arranged between the first electrical connection member 132 and the end cover, for insulating and isolating the first electrical connection member 132 and the end cover. The second insulating member 15 has a relatively high resistance value, which can make the first electrode terminal 13 and the end cover mutually insulated. For example, in the battery monomer 10 provided by some embodiments of the present application, the resistance value of the second insulating member 15 can be greater than or equal to 200MΩ.

[0228] Please refer to FIG. 8, along the thickness direction of the end cover, at least part of the third insulating member 19 is located between the second flange 171 and the end cover. The third insulating member 19 includes a fourth insulating portion 190, a fifth insulating portion and a sixth insulating portion 192. Along the radial direction x2 of the second terminal body, the fourth insulating portion 190 is located between the outer circumferential surface of the second terminal body 170 and the hole wall of the second electrode lead-out hole 1111. Along the thickness direction of the end cover, the fifth insulating portion 191 is located between the second flange 171 and the end cover. The sixth insulating portion 192 covers at least part of the outer circumferential surface of the second flange 171.

[0229] In some embodiments, the third insulating member 19 is a one-piece structure, and the fourth insulating portion 190, the fifth insulating portion 191 and the sixth insulating portion 192 are integrally formed plastic structures.

[0230] In some embodiments, the third insulation part 142 comprises a third portion 1910 and a fourth portion 1911, the third portion 1910 is integrally formed with the fourth insulation part 190, and the fourth portion 1911 is integrally formed with the sixth insulation part 192. The third portion 1910 and the fourth insulation part 190 are integrally formed plastic structures. The fourth portion 1911 and the sixth insulation part 192 are insulation coatings coated on the second flange 171.

[0231] Referring to FIG. 8, along the thickness direction of the end cover, at least a portion of the fourth insulation part 20 is arranged between the second electrical connecting part 172 and the end cover, for insulating and isolating the second electrical connecting part 172 and the end cover. The second insulation part 15 has a relatively high resistance value, which can insulate the second electrode terminal 17 and the end cover from each other. For example, in the battery cell 10 provided by some embodiments of the present application, the resistance value of the second insulation part 15 can be greater than or equal to 200 MΩ.

[0232] In some embodiments, the first deformation part 16 and the second deformation part 18 are flip chips respectively. When the battery cell 10 is in an abuse condition such as overcharge, the internal pressure of the battery cell 10 increases. When the internal pressure of the battery cell 10 reaches a first threshold value, the first deformation part 16 deforms to short the first electrode terminal 13 and the end cover. When the internal pressure of the battery cell 10 reaches a second threshold value, the second deformation part 18 deforms to short the second electrode terminal 17 and the end cover, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause internal short circuit. The large current generated instantaneously can melt the electrical connecting member inside the battery cell 10 to cut off the charging and discharging circuit of the battery cell 10, thereby playing a role of overcharge protection. The melted electrical connecting member can include the first adapter 121 and / or the second adapter 122. For example, the first adapter 121 has a first melting portion, and the overcurrent area of the first melting portion can be smaller than that of the rest of the first adapter 121, so that the first melting portion can be melted when a large current passes through, thereby breaking the current path of the first tab 120 and the first electrode terminal 13. For example, the second adapter 122 has a second melting portion, and the overcurrent area of the second melting portion can be smaller than that of the rest of the second adapter 122, so that the second melting portion can be melted when a large current passes through, thereby breaking the current path of the second tab 123 and the second electrode terminal 17.

[0233] In the above scheme, by arranging the first insulation part 14 between the first flange 131 of the first electrode terminal 13 and the end cover, and arranging the third insulation part 19 between the second flange 171 of the second electrode terminal 17 and the end cover, the electrical connection between the first electrode terminal 13 and the inner surface of the end cover can be reduced, and the electrical connection between the second electrode terminal 17 and the inner surface of the end cover can be reduced, thereby reducing the risk of internal short circuit of the battery cell 10, and further improving the reliability of the battery 100.

[0234] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein: include: a housing having a first wall; a first electrode terminal comprising a first flange, wherein the first flange is located inside the first wall; a first insulating member, wherein at least a portion of the first insulating member is located between the first flange and the first wall along a thickness direction of the first wall; Wherein, along the thickness direction of the first wall, the projection of the first flange falls within the projection of the first insulating member.

2. The battery cell according to claim 1, wherein: The first flange has a first surface facing the first wall along a thickness direction of the first wall, and the first insulating member covers the entire first surface.

3. The battery cell according to claim 1 or 2, wherein: Along the thickness direction of the first wall, the first flange includes a first surface and a second surface that are oppositely arranged, and an outer peripheral surface of the first flange connects the first surface and the second surface; The first insulating member covers at least a portion of an outer peripheral surface of the first flange.

4. The battery cell according to claim 3, wherein: The first insulating member covers the entire outer circumference of the first flange.

5. The battery cell according to any one of claims 1 to 4, wherein: The first wall is provided with a first electrode lead-out hole, the first electrode terminal is passed through the first electrode lead-out hole, and the first insulating member is at least partially located between the outer peripheral surface of the first electrode terminal and the hole wall of the first electrode lead-out hole.

6. The battery cell according to any one of claims 1 to 5, wherein: The first insulating member is integrally formed.

7. The battery cell according to any one of claims 5 to 6, wherein: The first electrode terminal further includes a first terminal body, the first wall is provided with a first electrode lead-out hole, and the first terminal body is passed through the first electrode lead-out hole; The first insulating member includes a first insulating portion, a second insulating portion and a third insulating portion. Along the radial direction of the first terminal body, the first insulating portion is located between the outer peripheral surface of the first terminal body and the hole wall of the first electrode lead-out hole. Along the thickness direction of the first wall, the second insulating portion is located between the first flange and the first wall. The third insulating portion covers at least a portion of the outer peripheral surface of the first flange.

8. The battery cell according to claim 7, wherein: The second insulating portion includes a first portion and a second portion, the first portion is connected to the first insulating portion, and the second portion is connected to the third insulating portion; Along a thickness direction of the first wall, a thickness of the first portion is greater than a thickness of the second portion.

9. The battery cell according to claim 8, wherein: The second insulating portion includes a first portion and a second portion that are separately provided. The first portion is integrally formed with the first insulating portion, and the second portion is integrally formed with the third insulating portion.

10. The battery cell according to claim 8 or 9, wherein: Along the thickness direction of the first wall, a projection of the first portion and a projection of the second portion have an overlapping area.

11. The battery cell according to any one of claims 8 to 10, wherein: The second portion and the third insulating portion are insulating coatings coated on the first flange.

12. The battery cell according to any one of claims 1 to 11, wherein: The first electrode terminal further includes a first electrical connector, and the first electrical connector is located outside the first wall; The battery cell further includes a second insulating member. At least a portion of the second insulating member is disposed between the first electrical connector and the first wall along a thickness direction of the first wall to insulate and isolate the first electrical connector from the first wall.

13. The battery cell according to claim 12, wherein: The resistance value of the second insulating member is greater than or equal to 200 megohms.

14. The battery cell according to any one of claims 1 to 13, wherein: The battery cell further includes a first deformable member electrically connected to the first wall, wherein the first deformable member is configured to be deformable to contact the first electrode terminal to electrically connect the first electrode terminal to the first wall.

15. The battery cell according to claim 14, wherein: The battery cell also includes a second electrode terminal and a second deformable member, the second electrode terminal is insulated and mounted on the first wall, the second deformable member is electrically connected to the first wall, and the second deformable member is configured to be deformable to contact the second electrode terminal to electrically connect the second electrode terminal to the first wall.

16. A battery, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 15.

17. An energy storage device, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 15.

18. An electrical device, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 15, wherein the battery cell is used to provide electrical energy.

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