Battery monomer, battery, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery, an energy storage device and a power utilization device. The battery cell includes a housing, a first electrode terminal, and a first insulator. The housing has a first wall. The first electrode terminal includes a first flange located inside the first wall. At least part of the first insulating part is located between the first flange and the first wall in the thickness direction of the first wall. And in the thickness direction of the first wall, the projection of the first flange falls into the projection of the first insulating part. According to the technical scheme provided by the invention, the reliability of the battery can be effectively improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a battery cell, a battery, an energy storage device and an electrical device. The technical solution provided in the present application can effectively improve the reliability of the battery.

[0005] 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. Along the thickness direction of the first wall, at least part of the first insulating member is located between the first flange and 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.

[0006] 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 into the first insulating member, the first wall and the first flange can be effectively insulated and isolated, and the risk of electrical connection between the first electrode terminal and the inner surface of the first wall, which causes internal short circuit of the battery cell, is reduced, thereby making the battery have higher reliability.

[0007] According to some embodiments of the present application, along a thickness direction of the first wall, the first flange has a first surface facing the first wall, and the first insulating member covers the entire first surface.

[0008] 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 first insulating member cover the entire first surface of the first flange, the first wall and the first flange can be effectively insulated and isolated, and the risk of electrical connection between the first electrode terminal and the inner surface of the first wall causing internal short circuit of the battery cell is reduced, thereby making the battery have higher reliability.

[0009] According to some embodiments of the present application, along the thickness direction of the first wall, the first flange includes a first surface and a second surface disposed opposite to each other, and the outer circumference of the first flange connects the first surface and the second surface. The first insulating member covers at least a portion of the outer circumference of the first flange.

[0010] 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 increased, the high voltage resistance between the first wall and the first flange can be effectively increased, and the risk of the first electrode terminal being electrically connected to the inner surface of the first wall, causing an internal short circuit in the battery cell, can be effectively reduced, thereby making the battery have higher reliability.

[0011] According to some embodiments of the present application, the first insulating member covers the entire outer circumference of the first flange.

[0012] In the above scheme, by setting the first insulating part to cover the entire outer circumference of the first flange, the creepage distance between the first wall and the first flange can be effectively increased, the high voltage resistance between the first wall and the first flange can be effectively increased, and the risk of electrical connection between the first electrode terminal and the inner surface of the first wall, causing internal short circuit of the battery cell, can be effectively reduced, thereby making the battery have higher reliability.

[0013] 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 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.

[0014] In the above scheme, by disposing at least a portion of the first insulating member between the outer peripheral 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, and the risk of electrical connection between the first electrode terminal and the first wall causing internal short circuit of the battery cell can be effectively reduced, thereby making the battery have higher reliability.

[0015] According to some embodiments of the present application, 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 penetrated 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.

[0016] In the above scheme, the first insulating member includes a first insulating portion, a second insulating portion and a third insulating portion. By providing 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 providing the second insulating portion, the first surface and the inner surface of the first wall can be effectively insulated and isolated, by providing the third insulating portion, the creepage distance between the first wall and the first flange can be increased, the high voltage resistance between the first wall and the first flange can be effectively increased, and the risk of the first electrode terminal being electrically connected to the inner surface of the first wall, causing an internal short circuit in the battery cell, can be effectively reduced, thereby making the battery have higher reliability.

[0017] According to some embodiments of the present application, the first insulating part, the second insulating part and the third insulating part are integrally formed.

[0018] In the above scheme, by arranging the first insulating part, the second insulating part and the third insulating part to be integrally formed, the first insulating part can have a higher structural strength, thereby effectively insulating and isolating the first electrode terminal and the first wall, reducing the risk of electrical connection between the first electrode terminal and the inner surface of the first wall, causing internal short circuit of the battery cell, and thus making the battery have higher reliability.

[0019] According to some embodiments of the present application, the second insulating part includes a first part and a second part, the first part is connected to the first insulating part, and the second part is connected to the third insulating part; along the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part.

[0020] In the above scheme, by setting the thickness of the first part of the second insulating part to be greater than the thickness of the second part, the first insulating member assembled between the first wall and the first electrode terminal is compressed to form a good sealing surface, thereby reducing the risk of electrolyte inside the battery cell leaking between the first terminal body and the hole wall of the first electrode lead-out hole, thereby improving the reliability of the battery.

[0021] According to some embodiments of the present application, the second insulating part includes a first part and a second part which are separately arranged, the first part is integrally formed with the first insulating part, and the second part is integrally formed with the third insulating part.

[0022] In the above scheme, the first insulating member is a split structure, including an integrally formed first part and a first insulating part, and an integrally formed second part and a third insulating part, which can reduce the difficulty of assembling the first insulating member between the first wall and the first electrode terminal, improve the assembly efficiency of the battery cell, and further improve the manufacturing efficiency of the battery.

[0023] According to some embodiments of the present application, along the thickness direction of the first wall, the projection of the first portion and the projection of the second portion have an overlapping area.

[0024] In the above scheme, by arranging the first part and the second part to be overlapped and staggered, on the one hand, the first part and the second part can effectively cover the first surface, thereby improving the insulation and withstand voltage performance of the first wall and the first surface; on the other hand, a sealing surface with good sealing effect can be formed between the first part and the second part, thereby reducing the risk of the electrolyte inside the battery cell infiltrating into the gap between the first part and the second part, thereby causing an internal short circuit in the battery cell, thereby making the battery have higher reliability.

[0025] According to some embodiments of the present application, the second portion and the third insulating portion are insulating coatings coated on the first flange.

[0026] In the above scheme, by setting the second part and the third insulating part as an insulating coating, on the one hand, it can play an insulating protection effect and reduce the risk of internal short circuit in the battery cell; on the other hand, it can reduce the impact of the battery cell mass energy density and volume energy density caused by the setting of the first insulating part, so that the battery has a 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 it can effectively improve the manufacturing efficiency of the battery cell, and then improve the manufacturing efficiency of the battery.

[0027] According to some embodiments of the present application, the first electrode terminal further includes a first electrical connector, which is located outside the first wall. The battery cell further includes a second insulating member, along the thickness direction of the first wall, at least a portion of the second insulating member is disposed between the first electrical connector and the first wall, for insulating and isolating the first electrical connector and the first wall.

[0028] In the above scheme, by arranging the second insulating member between the first wall and the first electrical connector, the first wall and the first electrical connector can be effectively insulated and isolated, and the risk of internal short circuit of the battery cell caused by short circuit between the first wall and the first electrical connector is reduced, so that the reliability of the battery is high. In particular, in energy storage devices with higher operating voltages, by arranging the second insulating member between the first wall and the first electrical connector, the risk of thermal runaway of the energy storage device can be effectively reduced due to the runaway of the remaining battery cells in the battery and the high voltage electricity on the outer shell, resulting in the high voltage electricity conducting the first wall and the electrode terminal, causing the internal short circuit of the battery cell.

[0029] According to some embodiments of the present application, the resistance value of the second insulating member is greater than or equal to 200 megohms.

[0030] In the above scheme, by setting the resistance value of the second insulating member to be greater than or equal to 200 megohms, the high-voltage insulation resistance between the first electrode terminal and the first wall can be effectively improved, which can effectively adapt to the insulation voltage resistance requirements of the energy storage device and reduce the risk of external voltage breaking through the second insulating member to connect the first wall and the first electrode terminal, causing an internal short circuit in the battery cell, so that the energy storage device has higher reliability.

[0031] According to some embodiments of the present application, the battery cell further includes a first deformable member electrically connected to the first wall, and 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.

[0032] In the above scheme, by providing a first deformation member, when the internal pressure of the battery cell reaches a certain level, such as a first threshold value, the first deformation member is deformed to contact the first electrode terminal, so that the first electrode terminal is electrically connected to the first wall, thereby realizing an internal short circuit in the battery cell, so that the electrical connection components inside the battery cell are melted due to the large current generated by the short circuit, so as to cut off the charge and discharge circuit of the battery cell, thereby playing a role in overcharge protection and reducing the risk of thermal runaway of the battery cell, thereby making the battery have higher reliability.

[0033] According to some embodiments of the present application, 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.

[0034] In the above scheme, by providing a second deformation member, when the internal pressure of the battery cell reaches a certain level, such as a second threshold value, the second deformation member is deformed to contact the second electrode terminal, so that the second electrode terminal is electrically connected to the second wall, and the first deformation member and the first electrode terminal are short-circuited, so that the electrical connection components inside the battery cell are melted due to the large current generated by the short circuit, so as to cut off the charging and discharging circuit of the battery cell, thereby playing a role in overcharge protection and reducing the risk of thermal runaway of the battery cell, thereby making the battery have higher reliability.

[0035] In a second aspect, some embodiments of the present application provide a battery, comprising the battery cell provided in the first aspect of claim 1.

[0036] In a third aspect, some embodiments of the present application provide an energy storage device, comprising the battery cell provided in the first aspect.

[0037] In a fourth aspect, some embodiments of the present application provide an electrical device, comprising the battery cell provided in the first aspect, wherein the battery cell is used to provide electrical energy.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of a vehicle in some embodiments of the present application;

[0041] Figure 2 A schematic diagram of an energy storage device in some embodiments of the present application;

[0042] Figure 3 A three-dimensional exploded view of a battery in some embodiments of the present application;

[0043] Figure 4 This is a three-dimensional exploded view of a battery cell in some embodiments of the present application;

[0044] Figure 5 A three-dimensional exploded view of a local structure of a battery cell in some embodiments of the present application;

[0045] Figure 6 A top view of a local structure of a battery cell in some embodiments of the present application;

[0046] Figure 7 for Figure 6 Sectional view from the AA direction;

[0047] Figure 8 Schematic diagram of a first electrode terminal, a first insulating member and a first wall in some embodiments of the present application;

[0048] Fig. 9 A schematic diagram of a first insulating member in some embodiments of the present application;

[0049] Fig.10 Schematic diagram of a first insulating member and a first electrode terminal in some other embodiments of the present application;

[0050] Fig.11 A schematic diagram of a first deformation member in some embodiments of the present application;

[0051] Fig.12 Schematic diagram of the first wall and the first electrode terminal in some embodiments of the present application;

[0052] Fig.13 A schematic diagram of a third insulating member in some embodiments of the present application;

[0053] Fig.14 Schematic diagram of a third insulating member and a second electrode terminal in some other embodiments of the present application;

[0054] Fig.15 This is a schematic diagram of the second deformation member in some embodiments of the present application.

[0055] icon:

[0056] 100-battery; 10-battery cell; 11-housing; 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 pole ear; 121-first adapter; 123-second pole ear; 122-second adapter; 13-first electrode terminal; 130-first terminal body; 131-first flange; 1310-first surface; 13 11-second surface; 132-first electrical connector; 14-first insulating member; 14a-first assembly hole; 140-first insulating portion; 141-second insulating portion; 1410-first portion; 1411-second portion; 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 deforming 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 member; 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 portion; 1911-fourth portion; 192 -sixth insulating part; 20-fourth insulating member; 20a-third mounting hole; 20b-fourth mounting hole; 200-fourth sub-insulating part; 201-fifth sub-insulating part; 202-sixth sub-insulating part; 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; 31-first box part; 32-second box part; 2000-energy storage device; 2001-cabinet; 1000-vehicle; 200-controller; 300-motor. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. Battery cells may be rectangular or in other shapes, etc., which are not limited in the embodiments of the present application. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a case 30 for encapsulating one or more battery cells. The case 30 can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells to a certain extent.

[0066] 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 of metal ions between the positive electrode sheet and the negative electrode sheet (for example, deintercalation) to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can be passed without melting to a certain extent, the number of positive pole ears is multiple and stacked together, and the number of negative pole ears is multiple and stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0067] The battery cell also includes a shell, and the electrode assembly and the electrolyte are arranged inside the shell. The shell has a first wall, and the first wall is provided with an electrode terminal, which is connected to the electrode assembly and is used for input and output of electric energy.

[0068] The development of battery technology must consider multiple design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, and battery reliability. During the abuse of battery cells such as overcharging and heating, the electrolyte inside the battery cells volatilizes due to high temperature, and there is a risk of connecting the electrode terminal and the inner surface of the first wall, causing the battery cells to short-circuit. Alternatively, during the transportation of the battery cells, the electrolyte inside the battery cells flows and infiltrates between the electrode terminal and the inner surface of the first wall, causing the risk of short-circuiting the battery cells, resulting in low reliability of the battery cells, and thus low reliability of the battery.

[0069] In view of this, in order to improve the problem that the inner surface of the first wall is short-circuited with the electrode terminal, resulting in an internal short circuit in 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 housing, a first electrode terminal and a first insulating member. The housing 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 along the thickness direction of the first wall, at least part of the first insulating member is located between the first flange and 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.

[0070] 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 into the first insulating member, the first wall and the first flange can be effectively insulated and isolated, and the risk of electrical connection between the first electrode terminal and the inner surface of the first wall, which causes internal short circuit of the battery cell, is reduced, thereby making the battery have higher reliability.

[0071] The technical solutions described in the embodiments of the present application are applicable to batteries, energy storage devices using batteries, and electrical devices using batteries.

[0072] The energy storage device may include an energy storage container, an energy storage cabinet, etc. Exemplarily, the energy storage cabinet may include a cabinet body and one or more batteries disposed on the cabinet body.

[0073] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be new energy vehicles, which may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0074] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0075] Figure 1 This is a schematic diagram of a vehicle in some embodiments of the present application.

[0076] A controller 200, a motor 300 and a battery 100 may be disposed inside the vehicle 1000, and the controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be disposed at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] See also Figure 2 , Figure 2 This is a schematic diagram of an energy storage device in some embodiments of the present application.

[0078] The energy storage device 2000 may include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 may be arranged in the cabinet 2001. The plurality of batteries 100 may be connected in series, in parallel or in mixed connection.

[0079] See also Figure 3 , Figure 3 It is a three-dimensional exploded view of the battery 100 in some embodiments of the present application.

[0080] The battery 100 includes a 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 a storage space for the battery cell 10, and the box 30 can adopt a variety of structures. In some embodiments, the box 30 may include a first box portion 31 and a second box portion 32, the first box portion 31 and the second box portion 32 cover each other, and the first box portion 31 and the second box portion 32 jointly define a storage space for accommodating the battery cell 10. The second box portion 32 may be a hollow structure with one end open, the first box portion 31 may be a plate-like structure, and the first box portion 31 covers the open side of the second box portion 32, so that the first box portion 31 and the second box portion 32 jointly define a storage space; the first box portion 31 and the second box portion 32 may also be hollow structures with one side open, and the open side of the first box portion 31 covers the open side of the second box portion 32. Of course, the box body 30 formed by the first box body portion 31 and the second box body portion 32 can be in various shapes, such as a cylinder, a cuboid, etc.

[0081] In the battery 100 , there may be one or more battery cells 10 , and each battery cell 10 may be fixed to the box body 30 by a connector (such as a bolt), or each battery cell 10 may be fixed to the box body 30 by bonding.

[0082] See also Figure 4-Figure 8 , Figure 4 This is a three-dimensional exploded view of a battery cell 10 in some embodiments of the present application. Figure 5 This is a three-dimensional exploded view of a partial structure of a battery cell 10 in some embodiments of the present application. Figure 6 This is a top view of a partial structure of a battery cell 10 in some embodiments of the present application. Figure 7 for Figure 6 Sectional view from the AA direction, Figure 8 Schematic diagram of the first electrode terminal 13 , the first insulating member 14 and the first wall 111 in some embodiments of the present application.

[0083] 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 the inner side of the first wall 111. Along the thickness direction z of the first wall, at least part of the first insulating member 14 is located between the first flange 131 and the first wall 111. Wherein, along the thickness direction z of the first wall, the projection of the first flange 131 falls within the projection of the first insulating member 14.

[0084] The housing 11 is a component for accommodating the electrode assembly 12. The housing 11 can also be used to accommodate electrolytes, such as electrolytes. Figure 4In some embodiments, the housing 11 includes a shell 110 and an end cap. A housing cavity is formed inside the shell 110, and the housing cavity is used to accommodate the electrode assembly 12. The shell 110 has an opening connected to the housing cavity. The end cap is covered at the opening of the shell 110 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cap can be connected to the shell 110 by welding, bonding, clamping or other connection methods. Optionally, the shell 11 may also include a bottom plate, and openings are formed at both ends of the shell 110, one of the openings is closed by the end cap, and the other opening is closed by the bottom plate.

[0085] In some embodiments, the material of the shell 11 can be metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, aluminum, 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, such as the end cover of the shell 11 can be made of metal, and the shell 110 or other parts of the shell 11 can be made of non-metallic materials.

[0086] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 may be placed in the housing 110 first, and the housing 110 may be filled with electrolyte, and then the end cap may be closed on the opening of the housing 110 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 may be placed in the housing 110 first, and then the end cap may be closed on the opening of the housing 110, and then the housing 110 may be filled with electrolyte through the injection hole on the end cap, and then the injection hole may be closed to complete the assembly of the battery cell 10.

[0087] The shell 11 may be in various shapes, such as a cylindrical or prismatic structure. The shape of the shell 11 may be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, a cylindrical shell 11 may be selected. If the electrode assembly 12 is a flat structure, the shell 11 may be square.

[0088] The first wall 111 is a part of the structure of the housing 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 electrical energy. In some embodiments, the first wall 111 can be a part of the housing 110, such as a side wall or a bottom wall of the housing 110. In some embodiments, the first wall 111 can be an end cover.

[0089] 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 is connected to the outer side of the first wall 111. The inner side of the first wall 111 is the inside of the housing 11, and the outer side of the first wall 111 is the outside of the housing 11.

[0090] The first electrode terminal 13 is a component installed on the first wall 111. The first electrode terminal 13 is used to be electrically connected to the electrode assembly 12, so that the current flows into or flows out of the first pole lug 120 through the first electrode terminal 13. The polarity of the first electrode terminal 13 and the first pole lug 120 is the same. In some embodiments, the first electrode terminal 13 is made of a metal material, for example, aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first electrode terminal 13 can be connected to the first pole lug 120 through a first adapter 121. Exemplarily, the first pole lug 120 of the electrode assembly 12 is composed of a plurality of first sub-pole lugs stacked together, and one end of the first adapter 121 can be welded to the first pole lug 120, and then the other end of the first adapter 121 can be welded to the first electrode terminal 13.

[0091] In some embodiments, see Figure 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 to each other. The first terminal body 130 is inserted into the first electrode lead-out hole 1110. Along the radial direction x1 of the first terminal body, the first flange 131 protrudes from the outer circumferential surface of the first terminal body 130. 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 structural member inserted into the first electrode lead-out hole 1110, and the first flange 131 can be a structural member protruding from the outer circumferential surface of the first terminal body 130.

[0092] In other embodiments, the first terminal and the first flange 131 may be separate structures, and the two are connected by welding, bonding, riveting or other connection methods.

[0093] In some embodiments, “the first terminal body 130 is provided in the first electrode lead-out hole 1110” can be understood as one end of the first terminal body 130 is located inside the housing 11 and the other end is located outside the housing 11, that is, the two 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 pole ear 120, and the end of the first terminal body 130 located on the outer side of the first wall 111 is used to connect the external current collection component. The shape of the first terminal body 130 is not limited, and it can be a cylinder, a polygonal cylinder, or other special-shaped cylinders. Optionally, the shape of the first terminal body 130 is a cylinder.

[0094] The “radial direction x1 of the first terminal body” may be a direction perpendicular to the central axis of the first terminal body 130 , or may be a direction perpendicular to the thickness direction z of the first wall.

[0095] In some embodiments, the first flange 131 is a protrusion disposed on the outer peripheral surface of the first terminal body 130, that is, the first flange 131 protrudes from the outer peripheral surface of the first terminal body 130 relative to the radial direction x1 of the first terminal body. The first flange 131 is located at one end of the first terminal body 130 located on the inner side of the first wall 111, and the first flange 131 directly or indirectly abuts against the first wall 111 to prevent the first terminal body 130 from moving to the outside 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 detaching from the first wall 111. The first terminal body 130 and the first flange 131 can be integrally formed, or they can be two parts that are separately formed and then connected by welding, bonding, etc. Optionally, the first flange 131 is integrally formed with the first terminal body 130.

[0096] The first insulating member 14 is a structural member with insulating properties. "Along the thickness direction z of the first wall, the projection of the first flange 131 falls within the projection of the first insulating member 14" can be understood as, in the thickness direction z of the first wall, the first insulating member 14 can effectively insulate and isolate the first flange 131 from the first wall 111. Exemplarily, 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 so that the first surface 1310 is insulated and isolated from the inner surface of the first wall 111. As another example, the first insulating member 14 is arranged on the inner surface of the first wall 111 so that the projection of the first flange 131 projected on the inner surface of the first wall 111 is in the area where the first insulating member 14 is located.

[0097] In some embodiments, the first insulating member 14 may be an integral structure. In other embodiments, the first insulating member 14 may be composed of a plurality of separate structural members.

[0098] Exemplarily, the manufacturing material of the first insulating member 14 may include other materials with insulating properties such as polyphenylene sulfide, polypropylene, polyethylene, etc. Also exemplarily, the first insulating member 14 includes an insulating coating disposed on the first flange 131 and an insulating structural member disposed between the first flange 131 and the first wall 111.

[0099] In the above scheme, by setting the first insulating member 14 between the first flange 131 of the first electrode terminal 13 and the first wall 111, and 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, and the risk of the first electrode terminal 13 being electrically connected to the inner surface of the first wall 111, which causes an internal short circuit in the battery cell 10, is reduced, thereby making the battery 100 have higher reliability.

[0100] 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 .

[0101] The first surface 1310 is the surface of the first flange 131 facing the first wall 111 . In some embodiments, the first surface 1310 is indirectly pressed against the inner surface of the first wall 111 through the first insulating member 14 to limit the movement of the first electrode terminal 13 along the thickness direction z of the first wall.

[0102] In some embodiments, a portion of the first insulating member 14 can cover the first surface 1310, and a portion of the first insulating member 14 can cover the outer circumference of the first flange 131. In some embodiments, a portion of the first insulating member 14 can cover the first surface 1310, a portion of the first insulating member 14 can cover the outer circumference of the first flange 131, and a portion of the first insulating member 14 can be disposed between the first terminal body 130 and the first electrode lead-out hole 1110.

[0103] According to some embodiments of this application, see Figure 8 Along the thickness direction z of the first wall, the first flange 131 includes a first surface 1310 and a second surface 1311 disposed opposite to each other, and the outer peripheral surface of the first flange 131 connects the first surface 1310 and the second surface 1311. The first insulating member 14 covers at least a portion of the outer peripheral surface of the first flange 131.

[0104] In some embodiments, the second surface 1311 is the surface of the first flange 131 away from the first wall 111, that is, the second surface 1311 is the surface of the first flange 131 facing the electrode assembly 12. In some embodiments, the second surface 1311 can be a flat surface.

[0105] The outer circumference of the first flange 131 is a surface located between the first surface 1310 and the second surface 1311 along the thickness direction z of the first wall. In some embodiments, when the first flange 131 is in a polygonal column shape, the outer circumference of the first flange 131 includes multiple side surfaces. In other embodiments, when the first flange 131 is in a cylindrical shape, the outer circumference of the first flange 131 is in an arc shape.

[0106] “The first insulating member 14 covers at least a portion of the outer circumference of the first flange 131” can be understood as the first insulating member 14 not only covers the first surface 1310, but also covers at least a portion of the first flange 131. Exemplarily, the first insulating member 14 is cylindrical, the first terminal body 130 passes through the first insulating member 14, and the first insulating member 14 covers the first flange 131, and the covered portion includes the first surface 1310 and the entire outer circumference of the first flange 131, or the covered portion includes the first surface 1310 and a portion of the outer circumference of the first flange 131.

[0107] In the above scheme, by covering at least a portion of the outer peripheral 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 increased, and the high voltage resistance between the first wall 111 and the first flange 131 can be effectively increased. The risk of the first electrode terminal 13 being electrically connected to the inner surface of the first wall 111, causing an internal short circuit in the battery cell 10, can be effectively reduced, thereby making the battery 100 have higher reliability.

[0108] According to some embodiments of this application, see Figure 8 The first insulating member 14 covers the entire outer circumference of the first flange 131 .

[0109] In some embodiments, the entire outer circumference of the first flange 131 is covered by the first insulating member 14 .

[0110] In some embodiments, the second surface 1311 may be a flat surface, and along the thickness direction z of the first wall, a plane where a surface of the first insulating member 14 facing away from the first wall 111 is located is the same plane as a plane where the second surface 1311 is located.

[0111] In the above scheme, by setting the first insulating member 14 to cover the entire outer circumference of the first flange 131, the creepage distance between the first wall 111 and the first flange 131 can be effectively improved, and the high voltage resistance between the first wall 111 and the first flange 131 can be effectively improved. The risk of the first electrode terminal 13 being electrically connected to the inner surface of the first wall 111, causing an internal short circuit in the battery cell 10, can be effectively reduced, thereby making the battery 100 have higher reliability.

[0112] In other embodiments, the first insulating member 14 may also cover at least a portion of the second surface 1311. Exemplarily, the second surface 1311 is disposed around the end surface of the first terminal body 130, the first insulating member 14 may also cover the entire second surface 1311, and the first tab 120 may be electrically connected to the end surface of the first terminal body 130. Exemplarily, the first insulating member 14 may also cover the edge of the second surface 1311.

[0113] According to some embodiments of this application, see Figure 8 The first wall 111 is provided with a first electrode lead-out hole 1110, and the first electrode terminal 13 is passed through the first electrode lead-out hole 1110. The first insulating member 14 is at least partially located between the outer peripheral surface of the first electrode terminal 13 and the hole wall of the first electrode lead-out hole 1110.

[0114] In some embodiments, 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 to each other. The first terminal body 130 is inserted into the first electrode lead-out hole 1110. At least a portion 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 from the hole wall of the first electrode lead-out hole 1110.

[0115] In the above scheme, by disposing at least a portion of the first insulating member 14 between the outer peripheral 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, and the risk of the first electrode terminal 13 being electrically connected to the first wall 111, causing an internal short circuit in the battery cell 10, can be effectively reduced, thereby making the battery have higher reliability.

[0116] According to some embodiments of the present application, the first insulating member 14 is integrally formed.

[0117] In some embodiments, the first insulating member 14 can be integrally formed by processes such as extrusion, injection molding, calendaring, blow molding, and thermoforming.

[0118] In the above scheme, by setting the first insulating member 14 as an integrally formed part, the first insulating member 14 can have a higher structural strength, thereby effectively insulating and isolating the first electrode terminal 13 and the first wall 111, reducing the risk of electrical connection between the first electrode terminal 13 and the inner surface of the first wall 111, causing an internal short circuit in the battery cell 10, and thereby making the battery 100 have higher reliability.

[0119] According to some embodiments of this application, see Figure 8 and Fig. 9 , Fig. 9Schematic diagram of the first insulating member 14 in some embodiments of the present application. The first electrode terminal 13 also includes 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 penetrated through the first electrode lead-out hole 1110. 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 z of the first wall, the second insulating portion 141 is located between the first flange 131 and the first wall 111. The third insulating portion 142 covers at least a portion of the outer circumferential surface of the first flange 131.

[0120] The first insulating portion 140 is a partial structure of the first insulating member 14. In some embodiments, the first insulating portion 140 is cylindrical and is disposed in the first electrode lead-out hole 1110, and the first terminal body 130 passes through the first insulating portion 140 to be electrically connected to the first electrode tab 120 of the electrode assembly 12. In some embodiments, along the radial direction x1 of the first terminal body, the size of the first insulating portion 140 is larger than the first electrode lead-out hole 1110, the first terminal body 130 passes through the first insulating portion 140, and the first terminal body 130 and the hole wall of the first electrode lead-out hole 1110 jointly squeeze the first insulating portion 140, so that the first insulating portion 140 is deformed, so that the first insulating portion 140 and the hole wall of the first electrode lead-out hole 1110 and the first insulating portion 140 and the first terminal body 130 are sealed and matched.

[0121] The second insulating portion 141 is a partial structure of the first insulating member 14 , and along the thickness direction z of the first wall, the second insulating portion 141 and the first insulating portion 140 are connected to each other.

[0122] In some embodiments, the second insulating portion 141 is cylindrical, and the first terminal body 130 passes through the second insulating portion 141, so that the second insulating 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 squeeze at least a portion of the second insulating portion 141 to deform at least a portion of the second insulating portion 141, thereby achieving a sealed fit between the second insulating portion 141 and the inner surface of the first wall 111 and between the second insulating portion 141 and the first flange 131.

[0123] The third insulating portion 142 is a partial structure of the first insulating member 14 . The third insulating portion 142 may be disposed along an edge of the second insulating portion 141 and surround and cover at least a portion of the outer circumferential surface of the first flange 131 .

[0124] In some embodiments, the first insulating portion 140, the second insulating portion 141 and the third insulating portion 142 may be an integrally formed structure. In other embodiments, the first insulating portion 140, the second insulating portion 141 and the third insulating portion 142 may be separate structures from each other. For example, along the thickness direction z of the first wall, the third insulating portion 142 may be sleeved on the outer peripheral surface of the first flange 131. Along the direction of the first wall 111 pointing to the electrode assembly 12, the second insulating portion 141 is assembled to the first surface 1310 corresponding to the first terminal body 130, and the second insulating portion 141 is sleeved on the first terminal body 130.

[0125] In some embodiments, see Fig. 9 The first insulating member 14 has a first assembly hole 14 a penetrating the first insulating portion 140 , the second insulating portion 141 and the third insulating portion 142 . The first assembly hole 14 a is used for the first terminal body 130 to pass through and for accommodating the first flange 131 .

[0126] In the above scheme, the first insulating member 14 includes a first insulating portion 140, a second insulating portion 141 and a third insulating portion 142. By providing the first insulating portion 140, the first terminal body 130 can be effectively insulated and isolated from the hole wall of the first electrode lead-out hole 1110, and by providing the second insulating 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 insulating portion 142, the creepage distance between the first wall 111 and the first flange 131 can be increased, and the high voltage resistance between the first wall 111 and the first flange 131 can be effectively increased, and the risk of the first electrode terminal 13 being electrically connected to the inner surface of the first wall 111, which causes an internal short circuit in the battery cell 10, can be effectively reduced, thereby making the battery 100 have a higher reliability.

[0127] According to some embodiments of this application, see Fig. 9 The second insulating portion 141 includes a first portion 1410 and a second portion 1411, wherein the first portion 1410 is connected to the first insulating portion 140, and the second portion 1411 is connected to the third insulating 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.

[0128] In some embodiments, the second insulating portion 141 is annular and 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 to the first insulating portion 140, and the second portion 1411 is connected to the third insulating portion 142.

[0129] 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 .

[0130] In some embodiments, the first portion 1410 and the first insulating portion 140 are squeezed by the first wall 111 and the first electrode terminal 13 to deform so as to form a seal between the first wall 111 and the first electrode terminal 13. The second portion 1411 and the third insulating portion 142 mainly function to insulate and isolate the first wall 111 and the first flange 131.

[0131] In the above scheme, by setting the thickness of the first part 1410 of the second insulating part 141 to be greater than the thickness of the second part 1411, the first insulating member 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 electrolyte inside the battery cell 10 leaking between the first terminal body 130 and the hole wall of the first electrode lead-out hole 1110, thereby improving the reliability of the battery 100.

[0132] According to other embodiments of the present application, see Fig.10 , Fig.10 Schematic diagram of the first insulating member 14 and the first electrode terminal 13 in some other embodiments of the present application.

[0133] The second insulating portion 141 includes a first portion 1410 and a second portion 1411 which are separately provided. The first portion 1410 is integrally formed with the first insulating portion 140 , and the second portion 1411 is integrally formed with the third insulating portion 142 .

[0134] In some embodiments, the second insulating portion 141 includes a first portion 1410 and a second portion 1411 which are separate structures from each other. The first portion 1410 is integrally formed with the first insulating portion 140. During assembly, the first portion 1410 and the first insulating portion 140 can be simultaneously assembled between the first electrode terminal 13 and the first wall 111. The second portion 1411 is integrally formed with the third insulating portion 142. During assembly, the second portion 1411 and the third insulating portion 142 can be simultaneously assembled on the first electrode terminal 13.

[0135] In some embodiments, the first portion 1410 and the first insulating portion 140 may be made of the same material, for example, both are made of plastic. In other embodiments, the first portion 1410 and the first insulating portion 140 may be made of different materials.

[0136] In some embodiments, the second portion 1411 and the third insulating portion 142 may be made of the same material, for example, both are made of plastic. In other embodiments, the second portion 1411 and the third insulating portion 142 may be made of different materials.

[0137] In some embodiments, the manufacturing materials of the first part 1410 and the second part 1411 can be the same or different. Exemplarily, the first insulating part 140 and the first part 1410 are both made of plastic material, and the first insulating part 140 and the first part 1410 can form a plastic ring structure. The third insulating part 142 and the second part 1411 are both made of plastic material, and the third insulating part 142 and the second part 1411 can form a plastic cylinder structure. Exemplarily again, the first insulating part 140 and the first part 1410 can form a plastic ring structure, and the third insulating part 142 and the second part 1411 can be an insulating coating applied to the first flange 131.

[0138] In the above scheme, the first insulating member 14 is a split structure, including an integrally formed first part 1410 and a first insulating part 140, and an integrally formed second part 1411 and a third insulating part 142, which can reduce the difficulty of assembling the first insulating member 14 between the first wall 111 and the first electrode terminal 13, improve the assembly efficiency of the battery cell 10, and further improve the manufacturing efficiency of the battery 100.

[0139] According to other embodiments of the present application, see 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.

[0140] In some embodiments, the first part 1410 and the second part 1411 are separate structures, and along the thickness direction z of the first wall, the projection of the first part 1410 and the projection of the second part 1411 partially overlap, so that parts of the first part 1410 and parts of the second part 1411 are stacked on each other.

[0141] Exemplarily, when the first part 1410 is plastic and the second part 1411 is an insulating coating, the first part 1410 can be pressed on the surface of the insulating coating. Exemplarily again, when the first part 1410 is plastic and the second part 1411 is plastic, the contacting part of the first part 1410 and the second part 1411 can be deformed to form a seal.

[0142] In the above scheme, by arranging the first part 1410 and the second part 1411 to overlap and stagger, on the one hand, the first part 1410 and the second part 1411 can effectively cover the first surface 1310, thereby improving the insulation and withstand voltage performance of the first wall 111 and the first surface 1310; on the other hand, a sealing surface with good sealing effect can be formed between the first part 1410 and the second part 1411, thereby reducing the risk of the electrolyte inside the battery cell 10 penetrating into the gap between the first part 1410 and the second part 1411, thereby causing an internal short circuit in the battery cell 10, thereby making the battery 100 have higher reliability.

[0143] According to some embodiments of the present application, the second portion 1411 and the third insulating portion 142 are insulating coatings coated on the first flange 131 .

[0144] In some embodiments, the second portion 1411 and the third insulating portion 142 may be made of epoxy resin, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The second portion 1411 and the third insulating portion 142 may be coated on the first flange 131 by dipping, spraying, electroplating, etc.

[0145] In the above scheme, by setting the second part 1411 and the third insulating part 142 as an insulating coating, on the one hand, it can play an insulating protection effect and reduce the risk of internal short circuit of the battery cell 10; on the other hand, it can reduce the influence of the first insulating part 14 on the mass energy density and volume energy density of the battery cell 10, so that the battery 100 has a higher mass energy density and volume energy density; on the other hand, the insulating coating can be formed on the first flange 131 through a simple process, so it can effectively improve the manufacturing efficiency of the battery cell 10, and then improve the manufacturing efficiency of the battery 100.

[0146] In some embodiments, the inner surface of the first wall 111 may be coated with an insulating coating.

[0147] According to some embodiments of this application, see Figure 5 and Figure 8 The first electrode terminal 13 further includes a first electrical connector 132, and the first electrical connector 132 is located outside the first wall 111. The battery cell 10 further includes a second insulating member 15, and along the thickness direction z of the first wall, at least a portion of the second insulating member 15 is disposed between the first electrical connector 132 and the first wall 111, for insulating and isolating the first electrical connector 132 and the first wall 111.

[0148] In some embodiments, the first electrical connector 132 is connected to the first terminal body 130, and the first electrical connector 132 is located outside the first wall 111 for connecting to an external busbar. In some embodiments, the connection relationship between the first electrical connector 132 and the first terminal body 130 includes, but is not limited to, welding, bonding, riveting, or screw connection. In other embodiments, the first electrical connector 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 the first terminal body 130 is connected to the first flange 131, so that the first terminal body 130 is clamped by the first electrical connector 132 and the first flange 131 on the first wall 111.

[0149] In some embodiments, the first electrical connector 132 is plate-shaped, and the first electrical connector 132 is insulated and installed on the outer surface of the first wall 111 through the second insulating member 15 .

[0150] The second insulating member 15 has a relatively high resistance value, and can insulate the first electrode terminal 13 and the first wall 111 from each other.

[0151] In some embodiments, the second insulating member 15 is formed with a first mounting hole 15a corresponding to the first electrode lead-out hole 1110 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 connector 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-out hole 1110. The third sub-insulating portion 152 is arranged along the edge of the first sub-insulating portion 150 and surrounds at least a portion of the outer circumference of the first electrical connector 132.

[0152] In some embodiments, the second insulating member 15 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a mixed 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 some other embodiments, the second insulating member 15 can also be made of other materials with insulating properties such as polypropylene and polyethylene.

[0153] In some embodiments, the resistance value of the second insulating member 15 may be in megaohms (MΩ). For example, in the battery cell 10 provided in some embodiments of the present application, the resistance value of the second insulating member 15 may be greater than or equal to 200 MΩ. In some other embodiments, the resistance value of the second insulating member 15 may 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 other values.

[0154] In the above scheme, by arranging the second insulating member 15 between the first wall 111 and the first electrical connector 132, the first wall 111 and the first electrical connector 132 can be effectively insulated and isolated, and the risk of internal short circuit of the battery cell 10 caused by short circuit between the first wall 111 and the first electrical connector 132 is reduced, so that the reliability of the battery 100 is high. In particular, in the energy storage device 2000 with a higher working voltage, by arranging the second insulating member 15 between the first wall 111 and the first electrical connector 132, the risk of thermal runaway of the energy storage device 2000 can be effectively reduced due to the runaway of the remaining battery cells 10 in the battery 100 and the high voltage electricity of the outer shell 11, resulting in the high voltage electricity conducting the first wall 111 and the electrode terminal, causing the internal short circuit of the battery cell 10.

[0155] According to some embodiments of the present application, the resistance value of the second insulating member 15 is greater than or equal to 200 megohms.

[0156] In some embodiments, a second insulating member 15 having a resistance greater than or equal to 200 megohms may be disposed between the first wall 111 and the first electrical connector 132 of the first electrode terminal 13. That is, in some embodiments, the resistance of the second insulating member 15 may be 200 megohms, 210 megohms, 220 megohms or more.

[0157] 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 volt-ampere method, an ohmmeter method, etc. In some embodiments, the resistance value of the second insulating member 15 can be measured by a megohmmeter.

[0158] In the above scheme, by setting the resistance value of the second insulating member 15 to be greater than or equal to 200 megohms, the high-voltage insulation resistance between the first electrode terminal 13 and the first wall 111 can be effectively improved, and the insulation voltage resistance requirements of the energy storage device 2000 can be effectively met, and the risk of external voltage breaking through the second insulating member 15 to conduct the first wall 111 and the first electrode terminal 13, causing an internal short circuit in the battery cell 10, is reduced, so that the energy storage device 2000 has higher reliability.

[0159] According to some embodiments of this application, see Figure 5 , Figure 7 as well as Figure 8 The battery cell 10 further includes a first deformable member 16 , which is electrically connected to the first wall 111 . The first deformable member 16 is configured to be deformable to contact the first electrode terminal 13 to electrically connect the first electrode terminal 13 to the first wall 111 .

[0160] The first deformable member 16 is mounted on the first wall 111, and the first deformable member 16 is electrically connected to the first wall 111. In some embodiments, the first deformable member 16 can be made of a metal material, for example, the first deformable member 16 is made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first deformable member 16 can be welded to the inner surface of the first wall 111.

[0161] The first deformable member 16 is a structural member that is deformed by the internal pressure of the battery cell 10. The first deformable 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. When the internal pressure reaches a certain level, such as a first threshold, the first deformable member 16 is deformed 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.

[0162] In some embodiments, the portion of the first deformable member 16 that is deformed by pressure to contact the first electrode terminal 13 may be the inner portion of the first electrode terminal 13 on the first wall 111, or may be the outer portion of the first electrode terminal 13 on the first wall 111. For example, the first deformable member 16 is deformed to be connected to the first flange 131 or the first terminal body 130 when the internal pressure of the battery cell 10 reaches the first threshold. For another example, the first deformable member 16 is deformed to be connected to the first electrical connector 132 when the internal pressure of the battery cell 10 reaches the first threshold. When "the first deformable member 16 is deformed to be connected to the first electrical connector 132 when the internal pressure of the battery cell 10 reaches the first threshold", the first wall 111 may be formed with a corresponding through hole so that the first deformable member 16 can pass through the through hole to connect to the first electrical connector 132. At the same time, under normal operating conditions, the first deformable member 16 may close the through hole.

[0163] In some embodiments, the first deformable member 16 may be a flip sheet, which flips under pressure. Figure 5 and Fig.11 , Fig.11 Schematic diagram of the first deformation member 16 in some embodiments of the present application.

[0164] The first deformable member 16 has a disc-shaped outer contour, and includes a first skirt 160, a first flip foil 161, and a first electrical connection portion 162 connected in sequence from the outside to the inside. The first skirt 160 can be connected to the first wall 111. The first flip foil 161 is relatively thin and is used to deform and flip under pressure. After the first flip foil 161 flips, it can push the first electrical connection portion 162 toward the first electrode terminal 13, so that the first electrical connection portion 162 contacts the first electrode terminal 13.

[0165] 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 deformable member 16 closes the first through hole 1112. The first flip foil 161 is collapsed in a direction away from the first wall 111 in a natural state. When the internal pressure of the battery cell 10 reaches a first threshold, the first flip foil 161 flips in a direction facing the first wall 111 to push the first electrical connection portion 162, so that the first electrical connection portion 162 passes through the first through hole 1112 and contacts the first electrical connection member 132. In some embodiments, the second insulating member 15 is formed with a second mounting hole 15b corresponding to the first through hole 1112, and the first deformable member 16 can penetrate the second mounting hole 15b and contact the first electrical connection member 132.

[0166] In some embodiments, the first electrode terminal 13 is electrically connected to the first electrode tab 120 through the first adapter 121, and the second electrode tab 123 of the electrode assembly 12 can be electrically connected to the housing 11. The second electrode tab has an opposite polarity to the first electrode tab 120. For example, the second electrode tab 123 is directly connected to the housing 11 or through the second adapter 122, or the housing 11 is provided with a second electrode terminal 17, the second electrode terminal 17 is electrically connected to the housing 11, and the second electrode tab 123 is directly connected to the second electrode terminal 17 or through the second adapter 122. When the internal pressure of the battery cell 10 reaches the first threshold, the first deformable member 16 is deformed to short-circuit the first electrode terminal 13 and the housing 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to form an internal short circuit. The large current generated instantly can fuse the electrical connection components inside the battery cell 10, cut off the charge and discharge circuit of the battery cell 10, and thus play a role in overcharge protection. The fused electrical connection components may include the first adapter 121 and / or the second adapter 122. Exemplarily, the first adapter 121 has a first fuse, and the flow area of ​​the first fuse can be smaller than the flow area of ​​the rest of the first adapter 121, so that when a large current passes through, the first fuse can be melted, thereby disconnecting the current path between the first pole tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 122 has a second fuse, and the flow area of ​​the second fuse can be smaller than the flow area of ​​the rest of the second adapter 122, so that when a large current passes through, the second fuse can be melted, thereby disconnecting the current path between the second pole tab 123 and the second electrode terminal 17 or the housing 11.

[0167] In other embodiments, the first electrode terminal 13 is electrically connected to the first electrode tab 120 through the first adapter 121, the second electrode tab 123 of the electrode assembly 12 can be electrically connected to the second electrode terminal 17, the second electrode tab 123 has an opposite polarity to the first electrode tab 120, and the second electrode terminal 17 can be insulated and installed on the housing 11, for example, insulated and installed on the first wall 111 of the housing 11. The second electrode tab 123 can be electrically connected to the second electrode terminal 17 through the second adapter 122. The second electrode terminal 17 is correspondingly provided with a second deformable member 18, the second deformable member 18 is electrically connected to the housing 11, and the second deformable member 18 is used to deform to contact the second electrode terminal 17 when the internal pressure of the battery cell 10 reaches the second threshold value, so as to electrically connect the second electrode terminal 17 to the housing 11.

[0168] When the pressure inside the battery cell 10 reaches a first threshold, the first deformable member 16 deforms to short-circuit the first electrode terminal 13 and the housing 11. When the pressure inside the battery cell 10 reaches a second threshold, the second deformable member 18 deforms to short-circuit the second electrode terminal 17 and the housing 11, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to form an internal short circuit. The large current generated instantly can fuse the electrical connection components inside the battery cell 10, cutting off the charge and discharge circuit of the battery cell 10, thereby playing a role in overcharge protection. The fused electrical connection components may include the first adapter 121 and / or the second adapter 122.

[0169] In the above scheme, by providing the first deformable member 16, when the internal pressure of the battery cell 10 reaches the first threshold value, the first deformable member 16 is deformed to contact the first electrode terminal 13, so that the first electrode terminal 13 is electrically connected to the first wall 111, and an internal short circuit of the battery cell 10 is achieved. The electrical connection components inside the battery cell 10 are melted due to the large current generated by the short circuit, so as 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.

[0170] According to some embodiments of the present application, the battery cell 10 also includes a second electrode terminal 17 and a second deformable member 18, the second electrode terminal 17 is insulated and installed on the first wall 111, the second deformable member 18 is electrically connected to the first wall 111, and the second deformable member 18 is configured to be deformable to contact the second electrode terminal 17 to electrically connect the second electrode terminal 17 to the first wall 111.

[0171] The second electrode terminal 17 is a component installed on the first wall 111. The second electrode terminal 17 is used to be electrically connected to the electrode assembly 12, and is used to allow current to flow into or out of the second electrode tab 123 through the second electrode terminal 17. The second electrode terminal 17 and the second electrode 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.

[0172] In some embodiments, the second electrode terminal 17 is made of a metal material, for example, aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second electrode terminal 17 can be connected to the second pole tab 123 through the second adapter 122. Exemplarily, the second pole tab 123 of the electrode assembly 12 is composed of a plurality of second sub-pole tabs stacked together, and one end of the second adapter 122 can be welded to the second pole tab 123, and then the other end of the second adapter 122 can be welded to the second electrode terminal 17.

[0173] “The second electrode terminal 17 is insulated and installed on the first wall 111 ” can be understood as the second electrode terminal 17 and the first wall 111 are insulated from each other.

[0174] A third insulating member 19 is disposed between the second electrode terminal 17 and the first wall 111 . The third insulating member 19 is used to insulate and isolate the second electrode terminal 17 from the inner surface of the first wall 111 .

[0175] For example, see Figure 5 , Fig.12 and Fig.13 , Fig.12 Schematic diagram of the first wall 111 and the first electrode terminal 13 in some embodiments of the present application. Fig.13 Schematic diagram 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 passed through the second electrode lead-out hole 1111, and the second flange 171 is located on the inner side of the first wall 111, and 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.

[0176] 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 that the third surface 1710 is insulated and isolated from the inner surface of the first wall 111.

[0177] In some embodiments, a portion of the third insulating member 19 can cover the third surface 1710, and a portion of the third insulating member 19 can cover the outer circumference of the second flange 171. In some embodiments, a portion of the third insulating member 19 can cover the third surface 1710, a portion of the third insulating member 19 can cover the outer circumference of the second flange 171, and a portion of the third insulating member 19 can be disposed between the second terminal body 170 and the second electrode lead-out hole 1111.

[0178] In some embodiments, the third insulating member 19 may be an integral structure. In other embodiments, the third insulating member 19 may be composed of a plurality of separate structural members.

[0179] Exemplarily, the manufacturing material of the third insulating member 19 may include other materials with insulating properties such as polyphenylene sulfide, polypropylene, polyethylene, etc. Also exemplarily, the third insulating member 19 includes an insulating coating disposed on the second flange 171 and an insulating structural member disposed between the second flange 171 and the first wall 111.

[0180] In some embodiments, see Fig.12 and Fig.13 , the third insulating member 19 includes a fourth insulating portion 190, a fifth insulating portion 191 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 peripheral surface of the second terminal body 170 and the hole wall of the second electrode lead-out hole 1111. Along the thickness direction z of the first wall, the fifth insulating portion 191 is located between the second flange 171 and the first wall 111. The sixth insulating portion 192 covers at least a portion of the outer peripheral surface of the second flange 171.

[0181] 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 cylindrical and is disposed in the second electrode lead-out hole 1111, and the second terminal body 170 passes through the fourth insulating portion 190 to be electrically connected to the second electrode tab 123 of the electrode assembly 12. In some embodiments, along the radial direction x2 of the second terminal body, the size of the fourth insulating portion 190 is larger than the second electrode lead-out 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-out hole 1111 jointly squeeze the fourth insulating portion 190, so that the fourth insulating portion 190 is deformed, so that the fourth insulating portion 190 and the hole wall of the second electrode lead-out hole 1111 and the fourth insulating portion 190 and the second terminal body 170 are sealed and matched.

[0182] The fifth insulating portion 191 is a partial structure of the first insulating member 14 , and along the thickness direction z of the first wall, the fifth insulating portion 191 is connected to the fourth insulating portion 190 .

[0183] In some embodiments, the fifth insulating portion 191 is cylindrical, and the second terminal body 170 passes through the fifth insulating portion 191, so that the fifth insulating portion 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 squeeze at least a portion of the fifth insulating portion 191 to deform at least a portion of the fifth insulating portion 191, thereby making the fifth insulating portion 191 and the inner surface of the first wall 111 and the fifth insulating portion 191 and the second flange 171 sealed and matched.

[0184] The sixth insulating portion 192 is a partial structure of the third insulating member 19 . The sixth insulating portion 192 may be disposed along an edge of the fifth insulating portion 191 and surround and cover at least a portion of the outer circumferential surface of the second flange 171 .

[0185] In some embodiments, the fourth insulating portion 190, the fifth insulating portion 191 and the sixth insulating portion 192 may be an integrally formed structure. In other embodiments, the fourth insulating portion 190, the fifth insulating portion 191 and the sixth insulating portion 192 may be separate structures from each other. For example, along the thickness direction z of the first wall, the sixth insulating portion 192 may be sleeved on the outer peripheral surface of the second flange 171. Along the direction of the first wall 111 pointing to the electrode assembly 12, the fifth insulating portion 191 is assembled to the third surface 1710 corresponding to the second terminal body 170, and the fourth insulating portion 190 is sleeved on the second terminal body 170.

[0186] In other embodiments of the present application, see Fig.14 , Fig.14 Schematic diagram of the third insulating member 19 and the second electrode terminal 17 in some other embodiments of the present application.

[0187] The fifth insulating portion 191 includes a third portion 1910 and a fourth portion 1911 which are separately arranged. The third portion 1910 and the fourth insulating portion 190 are integrally formed, and the fourth portion 1911 and the sixth insulating portion 192 are integrally formed.

[0188] In some embodiments, the fifth insulating portion 191 includes a third portion 1910 and a fourth portion 1911 which are separate structures from each other. The third portion 1910 is integrally formed with the fourth insulating portion 190. When assembled, the third portion 1910 and the fourth insulating portion 190 can be assembled between the first electrode terminal 13 and the first wall 111 at the same time. The fourth portion 1911 is integrally formed with the sixth insulating portion 192. When assembled, the fourth portion 1911 and the sixth insulating portion 192 can be assembled on the first electrode terminal 13 at the same time.

[0189] In some embodiments, the third portion 1910 and the fourth insulating portion 190 may be made of the same material, for example, both are made of plastic. In other embodiments, the third portion 1910 and the fourth insulating portion 190 may be made of different materials. In some embodiments, the fourth portion 1911 and the sixth insulating portion 192 may be made of the same material, for example, both are made of plastic. In other embodiments, the fourth portion 1911 and the sixth insulating portion 192 may be made of different materials.

[0190] In some embodiments, the manufacturing materials of the third part 1910 and the fourth part 1911 can be the same or different. Exemplarily, the fourth insulating part 190 and the third part 1910 are both made of plastic material, and the fourth insulating part 190 and the third part 1910 can form a plastic ring structure. The sixth insulating part 192 and the fourth part 1911 are both made of plastic material, and the sixth insulating part 192 and the fourth part 1911 can form a plastic cylinder structure. Exemplarily again, the fourth insulating part 190 and the third part 1910 can form a plastic ring structure, and the sixth insulating part 192 and the fourth part 1911 can be an insulating coating applied to the second flange 171.

[0191] In other embodiments of the present application, the sixth insulating portion 192 and the fourth portion 1911 may be an insulating coating applied to the second flange 171. For example, the material of the fourth portion 1911 and the sixth insulating portion 192 may include epoxy resin, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The sixth insulating portion 192 and the fourth portion 1911 may be applied to the second flange 171 by dip coating, spray coating, electroplating, etc.

[0192] See also 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 plastic and the fourth portion 1911 is an insulating coating, the third portion 1910 can be pressed on the surface of the insulating coating.

[0193] In some embodiments of the present application, a fourth insulating member 20 is disposed between the second electrode terminal 17 and the first wall 111 , and the fourth insulating member 20 is used to insulate and isolate the second electrode terminal 17 from the outer surface of the first wall 111 .

[0194] For example, see Fig.12 The second electrode terminal 17 further includes a second electrical connector 172, which is connected to the second terminal body 170 and is located outside the first wall 111. Along the thickness direction z of the first wall, at least a portion of the fourth insulating member 20 is disposed between the second electrical connector 172 and the first wall 111, for insulating and isolating the second electrical connector 172 and the first wall 111.

[0195] The second electrical connector 172 is connected to the second terminal body 170, and the second electrical connector 172 is located outside the first wall 111 for connecting to an external busbar. In some embodiments, the connection relationship between the second electrical connector 172 and the second terminal body 170 includes, but is not limited to, welding, bonding, riveting, or screw connection. In other embodiments, the second electrical connector 172 is integrally formed with the second terminal body 170. For example, along the direction of the first wall 111 pointing to the electrode assembly 12, the second terminal body 170 is inserted into the second electrode lead-out hole 1111 and the second terminal body 170 is connected to the second flange 171, so that the second terminal body 170 is clamped by the second electrical connector 172 and the second flange 171 on the first wall 111.

[0196] In some embodiments, see Figure 5 The second electrical connector 172 is plate-shaped and is insulated and mounted on the outer surface of the first wall 111 through a fourth insulating member 20 .

[0197] The fourth insulating member 20 has a relatively high resistance value, and can insulate the second electrode terminal 17 from the first wall 111 .

[0198] 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 for the second electrode terminal 17 to pass through. Optionally, the fourth insulating member 20 includes a fourth sub-insulating portion 200, a fifth sub-insulating portion 201, and a sixth sub-insulating portion 202. The fourth sub-insulating portion 200 is located between the second electrical connector 172 and the outer surface of the first wall 111, and the third mounting hole 20a is formed on the fourth sub-insulating portion 200. The fifth sub-insulating portion 201 is arranged around the third mounting hole 20a and is located between the second terminal body 170 and the hole wall of the second electrode lead-out hole 1111. The sixth sub-insulating portion 202 is arranged along the edge of the fourth sub-insulating portion 200 and surrounds at least part of the outer circumference of the second electrical connector 172.

[0199] In some embodiments, the fourth insulating member 20 may be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material. For example, in some embodiments of the present application, the material of the fourth insulating member 20 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the fourth insulating member 20 may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0200] In some embodiments, the resistance value of the fourth insulating member 20 may be in megaohms (MΩ). For example, in the battery cell 10 provided in some embodiments of the present application, the resistance value of the fourth insulating member 20 may be greater than or equal to 200 MΩ. In some other embodiments, the resistance value of the fourth insulating member 20 may 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.

[0201] In some embodiments, the resistance value of the fourth insulating member 20 can be measured by a multimeter test method, a bridge measurement method, a volt-ampere method, an ohmmeter method, etc. In some embodiments, the resistance value of the fourth insulating member 20 can be measured by a megohmmeter.

[0202] See also Figure 5 , Fig.12 as well as Fig.15 , Fig.15 Schematic diagram of the second deformation member 18 in some embodiments of the present application.

[0203] The second deformable member 18 is mounted on the first wall 111, and the second deformable member 18 is electrically connected to the first wall 111. In some embodiments, the second deformable member 18 can be made of a metal material, for example, the second deformable member 18 is made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second deformable member 18 can be welded to the inner surface of the first wall 111.

[0204] The second deformable member 18 is a structural member that is deformed by the internal pressure of the battery cell 10. The second deformable member 18 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. When the internal pressure reaches the second threshold, the second deformable member 18 deforms to contact the second electrode terminal 17, thereby connecting the first wall 111 and the second electrode terminal 17, and cooperates with the first deformable member 16 to 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.

[0205] In some embodiments, the first threshold value may be equal to the second threshold value. In other embodiments, the first threshold value may 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 may be greater than the first threshold value, so that the second deformable member 18 is deformed only under a greater pressure.

[0206] In some embodiments, the portion of the second deformable member 18 that is deformed by pressure to contact the second electrode terminal 17 may be the inner portion of the second electrode terminal 17 on the first wall 111, or may be the outer portion of the second electrode terminal 17 on the first wall 111. For example, the second deformable member 18 is deformed to be connected to the second flange 171 or the second terminal body 170 when the internal pressure of the battery cell 10 reaches the second threshold. For another example, the second deformable member 18 is deformed to be connected to the second electrical connector 172 when the internal pressure of the battery cell 10 reaches the second threshold. When "the second deformable member 18 is deformed to be connected to the second electrical connector 172 when the internal pressure of the battery cell 10 reaches the second threshold", the first wall 111 may be formed with a corresponding through hole so that the second deformable member 18 can pass through the through hole to connect to the second electrical connector 172. At the same time, under normal operating conditions, the second deformable member 18 may close the through hole.

[0207] For example, see Fig.15 The second deformable member 18 has a disc-shaped outer contour, and includes a second skirt 180, a second flip foil 181, and a second electrical connection portion 182 connected in sequence from the outside to the inside. The second skirt 180 can be connected to the first wall 111. The second flip foil 181 is relatively thin and is used to deform and flip under pressure. After the second flip foil 181 flips, it can push the second electrical connection portion 182 toward the second electrode terminal 17, so that the second electrical connection portion 182 contacts the second electrode terminal 17.

[0208] Exemplarily, the first wall 111 has a second through hole 1113, and the second skirt 180 is welded to the inner surface of the first wall 111, so that the second deformable member 18 closes the second through hole 1113. The second flip foil 181 is collapsed in a direction away from the first wall 111 in a natural state. When the internal pressure of the battery cell 10 reaches a second threshold, the second flip foil 181 flips in a direction facing the first wall 111 to push the second electrical connection portion 182, so that the second electrical connection portion 182 passes through the second through hole 1113 and contacts the second electrical connection member 172. In some embodiments, the fourth insulating member 20 is formed with a fourth mounting hole 20b corresponding to the second through hole 1113, and the second deformable member 18 can be deformed to pass through the fourth mounting hole 20b and contact the second electrical connection member 172.

[0209] In some embodiments, when the battery cell 10 is in an abuse condition due to overcharging or other conditions, the internal pressure of the battery cell 10 increases. When the internal pressure of the battery cell 10 reaches a first threshold, the first deformable member 16 deforms to short-circuit the first electrode terminal 13 and the housing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformable member 18 deforms to short-circuit the second electrode terminal 17 and the housing 11, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to form an internal short circuit. The large current generated instantly can fuse the electrical connection components inside the battery cell 10, cut off the charge and discharge circuit of the battery cell 10, and thus play a role in overcharge protection. The fused electrical connection components may include the first adapter 121 and / or the second adapter 122.

[0210] In the above scheme, by providing the second deforming member 18, when the internal pressure of the battery cell 10 reaches the second threshold value, the second deforming member 18 is deformed to contact the second electrode terminal 17, so that the second electrode terminal 17 is electrically connected to the second wall, and the first deforming member 16 and the first electrode terminal 13 are short-circuited, so that the electrical connection components inside the battery cell 10 are melted due to the large current generated by the short circuit, so as to cut off the charging and discharging circuit of the battery cell 10, thereby playing a role of overcharge protection, and playing a role of reducing the risk of thermal runaway of the battery cell 10, so that the battery 100 has higher reliability.

[0211] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 has the battery cell 10 described above. Figure 3 The battery 100 includes a battery cell 10 and a box body 30, wherein the battery cell 10 is accommodated in the box body 30. The box body 30 is used to provide an accommodating space for the battery cell 10, and the box body 30 can adopt a variety of structures.

[0212] In the battery 100 , there may be one or more battery cells 10 , and each battery cell 10 may be fixed to the box body 30 by a connector (such as a bolt), or each battery cell 10 may be fixed to the box body 30 by bonding.

[0213] According to some embodiments of the present application, an energy storage device 2000 is further provided. The energy storage device 2000 includes the battery cell 10 described above.

[0214] In some embodiments, the battery cells 10 are first formed into a battery 100, and one or more batteries 100 are then used in an energy storage device 2000. Figure 2 The energy storage device 2000 may include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 may be arranged in the cabinet 2001. The plurality of batteries 100 may be connected in series, in parallel or in mixed connection.

[0215] According to some embodiments of the present application, an electric device is also provided, and the electric device includes the battery cell 10 described above. In some embodiments, the battery cell 10 first forms a battery 100, and one or more batteries 100 are then applied to the electric device.

[0216] In some embodiments, see Figure 1 The electrical device is a vehicle. A controller, a motor and a battery 100 may be arranged inside the vehicle, and the controller is used to control the battery 100 to supply power to the motor.

[0217] According to some embodiments of the present application, a battery cell 10 is provided. Figure 4-Figure 15 .

[0218] The battery cell 10 includes a housing 11 , an electrode assembly 12 , a first electrode terminal 13 , a first insulating member 14 , a second insulating member 15 , a first deformable member 16 , a second electrode terminal 17 , a third insulating member 19 , a fourth insulating member 20 and a second deformable member 18 .

[0219] The housing 11 includes a shell 110 and a first wall 111, and the first wall 111 may be an end cap. A receiving cavity is formed inside the shell 110, and the receiving cavity is used to receive the electrode assembly 12. The shell 110 has an opening connected to the receiving cavity, and the end cap closes the opening of the shell 110, so that the electrode assembly 12 is in a closed space.

[0220] The end cap 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 that penetrate along the thickness direction of the end cap. 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 deformable member 16 is welded to the inner surface of the end cap and closes the first through hole 1112. The second deformable member 18 is welded to the inner surface of the end cap and closes the second through hole 1113.

[0221] Along the thickness direction of the end cover, the first electrode terminal 13 includes a first electrical connector 132, a first terminal body 130 and a first flange 131 which are interconnected. The first electrical connector 132 is located on the outside of the end cover, the first terminal body 130 is passed through the first electrode lead-out hole 1110, and the first flange 131 is located on the inside of the end cover.

[0222] Along the thickness direction of the end cover, the second electrode terminal 17 includes a second electrical connector 172, a second terminal body 170 and a second flange 171 which are interconnected. The second electrical connector 172 is located on the outside of the end cover, the second terminal body 170 is passed through the second electrode lead-out hole 1111, and the second flange 171 is located on the inside of the end cover.

[0223] See also Figure 8 , along the thickness direction of the end cap, at least part of the first insulating member 14 is located between the first flange 131 and the end cap. 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 circumference 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 cap, the second insulating portion 141 is located between the first flange 131 and the end cap. The third insulating portion 142 covers at least part of the outer circumference of the first flange 131.

[0224] In some embodiments, the first insulating member 14 is an integral structure, and the first insulating portion 140 , the second insulating portion 141 , and the third insulating portion 142 are an integrally molded plastic structure.

[0225] In other embodiments, the second insulating portion 141 includes a first portion 1410 and a second portion 1411 which are separately provided, wherein the first portion 1410 is integrally formed with the first insulating portion 140, and the second portion 1411 is integrally formed with the third insulating portion 142. The first portion 1410 and the first insulating portion 140 are integrally formed plastic structures. The second portion 1411 and the third insulating portion 142 are insulating coatings applied to the first flange 131.

[0226] See also Figure 8, along the thickness direction of the end cap, at least a portion of the second insulating member 15 is disposed between the first electrical connector 132 and the end cap, for insulating and isolating the first electrical connector 132 and the end cap. The second insulating member 15 has a relatively high resistance value, and can insulate the first electrode terminal 13 from the end cap. Exemplarily, in the battery cell 10 provided in some embodiments of the present application, the resistance value of the second insulating member 15 may be greater than or equal to 200 MΩ.

[0227] See also Figure 8 , along the thickness direction of the end cap, at least part of the third insulating member 19 is located between the second flange 171 and the end cap. 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 circumference 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 cap, the fifth insulating portion 191 is located between the second flange 171 and the end cap. The sixth insulating portion 192 covers at least part of the outer circumference of the second flange 171.

[0228] In some embodiments, the third insulating member 19 is an integral structure, and the fourth insulating portion 190 , the fifth insulating portion and the sixth insulating portion 192 are an integrally molded plastic structure.

[0229] In other embodiments, the third insulating portion 142 includes a third portion 1910 and a fourth portion 1911 which are separately arranged, the third portion 1910 and the fourth insulating portion 190 are integrally formed, and the fourth portion 1911 and the sixth insulating portion 192 are integrally formed. The third portion 1910 and the fourth insulating portion 190 are integrally formed plastic structures. The fourth portion 1911 and the sixth insulating portion 192 are insulating coatings applied to the second flange 171.

[0230] See also Figure 8 , along the thickness direction of the end cap, at least a portion of the fourth insulating member 20 is disposed between the second electrical connector 172 and the end cap, for insulating and isolating the second electrical connector 172 and the end cap. The second insulating member 15 has a relatively high resistance value, which can insulate the second electrode terminal 17 from the end cap. Exemplarily, in the battery cell 10 provided in some embodiments of the present application, the resistance value of the second insulating member 15 may be greater than or equal to 200 MΩ.

[0231] In some embodiments, the first deformable member 16 and the second deformable member 18 are flip plates. When the battery cell 10 is in an abuse condition due to overcharging or other conditions, the internal pressure of the battery cell 10 increases. When the internal pressure of the battery cell 10 reaches a first threshold, the first deformable member 16 deforms to short-circuit the first electrode terminal 13 and the end cap. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformable member 18 deforms to short-circuit the second electrode terminal 17 and the end cap, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to form an internal short circuit. The large current generated instantly can fuse the electrical connection components inside the battery cell 10 and cut off the charge and discharge circuit of the battery cell 10, thereby playing a role in overcharge protection. The fused electrical connection components may include the first adapter 121 and / or the second adapter 122. Exemplarily, the first adapter 121 has a first fuse, and the flow area of ​​the first fuse can be smaller than the flow area of ​​the rest of the first adapter 121, so that when a large current passes through, the first fuse can be melted, thereby disconnecting the current path between the first pole tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 122 has a second fuse, and the flow area of ​​the second fuse can be smaller than the flow area of ​​the rest of the second adapter 122, so that when a large current passes through, the second fuse can be melted, thereby disconnecting the current path between the second pole tab 123 and the second electrode terminal 17.

[0232] In the above scheme, by setting the first insulating member 14 between the first flange 131 of the first electrode terminal 13 and the end cover, and setting the third insulating member 19 between the second flange 171 of the second electrode terminal 17 and the end cover, the risk of electrical connection between the first electrode terminal 13 and the inner surface of the end cover, and the risk of electrical connection between the second electrode terminal 17 and the inner surface of the end cover, which may cause internal short circuit of the battery cell 10, can be reduced, thereby making the battery 100 have higher reliability.

[0233] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, 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, characterized in that: include: a housing having a first wall; A first electrode terminal including 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The first insulating member is integrally formed.

7. The battery cell according to any one of claims 5 to 6, characterized in that: 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, characterized in that: 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, characterized in that: The second insulating portion includes a first portion and a second portion which 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, characterized in that: 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, characterized in that: 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, characterized in that: The first electrode terminal further includes a first electrical connection member, and the first electrical connection member is located outside the first wall; The battery cell further includes a second insulating member. Along the thickness direction of the first wall, at least a portion of the second insulating member is disposed between the first electrical connector and the first wall for insulating and isolating the first electrical connector and the first wall.

13. The battery cell according to claim 12, characterized in that: 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, characterized in that: The battery cell further includes a first deformable member electrically connected to the first wall, the first deformable member being 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, characterized in that: 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, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 15.

17. An energy storage device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 15.

18. An electrical device, characterized in that: 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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