Battery cell, battery device, energy storage device, energy storage system and charging network

Abstract

The application relates to the technical field of battery-related technologies, and discloses a battery monomer, a battery device, an energy storage equipment, an energy storage system and a charging network. The battery monomer comprises a shell, an electrode assembly, an insulating piece and a supporting piece. The shell has a first wall and a containing cavity. The electrode assembly is arranged in the containing cavity. The insulating piece is arranged between the first wall and the electrode assembly. The insulating piece has a receiving part. The supporting piece is arranged between the insulating piece and the first wall. The supporting piece has a connecting part. The connecting part is connected with the first wall. In the arrangement direction from the first wall to the electrode assembly, at least part of the projection of the connecting part on the electrode assembly falls into the projection of the receiving part on the electrode assembly. The reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery-related technologies, and in particular to a battery cell, battery device, energy storage device, energy storage system and charging network. Background Technology

[0002] This section provides only background information relevant to this application and is not necessarily prior art.

[0003] Battery devices can store electrical energy and can be widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools; battery devices can also be used in energy storage devices such as energy storage cabinets.

[0004] The reliability of battery devices is the foundation for their practical application. Improving the reliability of battery devices has always been a key focus in battery research and development. Utility Model Content

[0005] In view of the above problems, this application provides a battery cell, a battery device, an energy storage device, an energy storage system, and a charging network to improve the reliability of the battery cell.

[0006] The first aspect of this application provides a battery cell including a casing, an electrode assembly, an insulating member, and a support member. The casing has a first wall and a receiving cavity; the electrode assembly is disposed in the receiving cavity; the insulating member is disposed between the first wall and the electrode assembly, and the insulating member has a receiving portion; the support member is disposed between the insulating member and the first wall, and the support member has a connecting portion connected to the first wall. Along the arrangement direction from the first wall to the electrode assembly, at least a portion of the projection of the connecting portion on the electrode assembly falls within the projection of the receiving portion on the electrode assembly.

[0007] In the technical solution of this application embodiment, the insulating member can play a protective role between the first wall and the electrode assembly, reducing the possibility of a short circuit between the first wall and the electrode assembly. By providing a support member between the insulating member and the first wall, the support member can provide better support for the electrode assembly when the battery cell experiences thermal runaway, reducing the possibility of the electrode assembly shifting due to the influence of emissions. The support member is connected to the first wall through a connecting part, reducing the possibility of friction debris generated by the movement of the support member relative to the first wall. Furthermore, a receiving part is provided on the insulating member, and at least a portion of the projection of the connecting part on the electrode assembly falls within the projection of the receiving part on the electrode assembly. The receiving part can receive debris generated by the connecting part and the first wall due to assembly connection operations or friction, reducing the possibility of debris entering the area where the electrode assembly is located, reducing the possibility of debris causing a short circuit or other adverse effects on the battery cell, and improving the reliability of the battery cell.

[0008] In addition, the battery cell according to this application may also have the following additional technical features: In some embodiments of this application, the receiving portion is provided with a receiving groove, the opening of which faces the connecting portion. Along the arrangement direction from the first wall to the electrode assembly, at least a portion of the projection of the connecting portion on the electrode assembly falls within the projection of the receiving groove on the electrode assembly. The opening of the receiving groove faces the connecting portion, allowing debris generated during connection or friction between the connecting portion and the first wall to enter and be collected or concealed by the receiving groove. This reduces the likelihood of short circuits in the battery cell due to debris, thus improving the reliability of the battery cell.

[0009] In some embodiments of this application, the side of the connecting portion away from the electrode assembly contacts and connects with the side of the first wall facing the electrode assembly to form a connecting area. Along the arrangement direction from the first wall to the electrode assembly, the projection of the connecting area onto the electrode assembly falls within the projection of the receiving groove onto the electrode assembly. The connecting area easily traps debris (e.g., welding slag). By correspondingly positioning the connecting area and the receiving groove, the receiving groove can collect or conceal debris from the connecting area, reducing the possibility of short circuits in the battery cell due to debris and improving the reliability of the battery cell.

[0010] In some embodiments of this application, the insulating member has a receiving groove on the side facing the first wall, and the support member is at least partially received in the receiving groove. By providing a receiving groove to the insulating member and at least partially placing the support member within the receiving groove, the assembly reliability and ease of the support member and the insulating member are improved. Furthermore, the insulating member can cover the support member through the receiving groove, reducing the possibility of the exposed support member short-circuiting with the electrode assembly, thus improving the reliability of the battery cell.

[0011] In some embodiments of this application, the bottom wall of the receiving groove is spaced apart from the support member along the arrangement direction of the first wall and the insulating member. By spaced apart the bottom wall of the receiving groove of the support member and the insulating member, the assembly reliability and convenience between the support member and the insulating member are improved, and the insulating member can be abutted against the first wall, so that the insulating member can play a supporting and buffering role between the first wall and the electrode assembly.

[0012] In some embodiments of this application, along the direction intersecting the arrangement direction of the first wall and the insulating member, the receiving portion is disposed on one side of the receiving groove. The support member includes a support body disposed in the receiving groove. The connecting portion is connected to the end of the support body facing the first wall. Along the direction intersecting the arrangement direction of the first wall and the insulating member, one end of the connecting portion is connected to the support body, and the other end of the connecting portion extends away from the support body from the receiving portion. The connecting portion being located on one side of the support body reduces the possibility of interference from the support body when the connecting portion is assembled with the first wall, improving the ease of assembly between the connecting portion and the first wall. The support body being disposed in the receiving groove, with the connecting portion corresponding to the receiving portion disposed on one side of the receiving groove, reduces interference of the support member with the first wall and the insulating member, improving the ease of assembly between the first wall and the insulating member. Furthermore, by disposing the receiving portion on one side of the receiving groove, the freedom of arrangement of the receiving groove and the receiving portion is increased, making the molding of the insulating member more convenient.

[0013] In some embodiments of this application, the receiving portion is provided with a receiving groove, the opening of the receiving groove facing the first wall, a first groove wall is provided between the receiving groove and the receiving groove, and a first notch is formed between the first groove wall and the first wall at intervals, the first notch connecting the receiving groove and the receiving groove, and the connecting portion passing through the first notch. By providing the first notch in the first groove wall, assembly space can be provided for the connecting portion, reducing the possibility of the connecting portion interfering with the assembly of the insulating component and the first wall, and improving the assembly convenience and reliability of the battery cell.

[0014] In some embodiments of this application, along the arrangement direction of the first wall and the insulating member, the size of the first notch is h1 and the size of the connecting portion is h2, wherein h1 is greater than h2. By setting the size h1 of the first notch to be greater than the thickness h2 of the connecting portion, the connecting portion can be located in the first notch and does not protrude from the receiving groove, and therefore does not protrude from the side of the insulating member facing the first wall. This allows the insulating member to be in contact with the first wall, enabling the insulating member to provide support and buffering between the first wall and the electrode assembly.

[0015] In some embodiments of this application, the first groove wall protrudes beyond the bottom wall of the receiving groove. The first groove wall also has a certain height corresponding to the position of the first notch, so that the receiving groove can form a groove structure that surrounds all four sides, reducing the possibility of debris leaking from the receiving groove and improving the reliability of the battery cell.

[0016] In some embodiments of this application, a pressure relief zone is provided on the first wall, a connecting hole is provided on the wall of the receiving groove, and a discharge hole is provided on the supporting body, the discharge hole connecting the connecting hole and the pressure relief zone.

[0017] In some embodiments of this application, the discharge hole includes a first discharge hole, the support body includes a first part and a plurality of second parts, the first part and the plurality of second parts are all located in the receiving groove, one end of the plurality of second parts is connected to the first part, the other end of the plurality of second parts extends toward the first wall, at least one of the second parts is connected to the connecting part at one end toward the first wall, the plurality of second parts are connected to the circumferential edge of the first part and are spaced apart along the circumferential direction of the first part, and the first discharge hole is located between two adjacent second parts. Multiple second parts of the support are spaced apart, and a first discharge hole can be formed between two adjacent second parts. When a battery cell experiences thermal runaway, the emissions can flow to the pressure relief area through the first discharge hole. Furthermore, by providing second parts extending away from the electrode assembly on the first part of the support, the second parts can serve as support feet for the support, thereby improving the support strength of the support and enabling it to provide better support for the electrode assembly. Due to the support's limiting effect, the pressure relief area and the electrode assembly can be spaced apart, reducing the possibility that the electrode assembly might move towards and block the pressure relief area when a battery cell experiences thermal runaway. Emissions generated by the battery cell can be discharged in a timely manner through the pressure relief area, reducing the possibility of significant damage caused by thermal runaway and improving the reliability of the battery cell. Meanwhile, one end of the second part of the support is connected to the first part, and the end of the second part away from the electrode assembly is spaced apart. Each spaced second part can form a first discharge hole, which reduces the processing difficulty of the second part, makes the support easy to form, improves the processing convenience of the support, and enables the support to be mass-produced in the industrial sector, which improves processing efficiency, saves consumables, and reduces the production cost of battery cells.

[0018] In some embodiments of this application, the first discharge hole includes a first sub-discharge hole. The first part has at least one corner area, and the second part is positioned to avoid the corner area. The second parts on adjacent sides of the corner area are spaced apart to form the first sub-discharge hole. By providing a first discharge hole in the corner area of ​​the first part, the discharge area can be increased, improving the timeliness of discharge when the battery device experiences thermal runaway. Furthermore, when the support member is formed by bending a sheet metal, material accumulation is prone to occur in the corner area of ​​the sheet metal, and bending the corner area is difficult. By providing a first discharge hole in the corner area, the support member can be easily bent using a bending die, improving the forming convenience of the support member.

[0019] In some embodiments of this application, the support member includes a first support member, the discharge hole includes a second discharge hole, the first support member is disposed opposite to the pressure relief area, and the second discharge hole is provided on the first part of the first support member.

[0020] In some embodiments of this application, the receiving groove where the first support member is provided is a first receiving groove, and the bottom wall of the first receiving groove is configured as a filter screen structure or a filter screen structure is provided inside the first receiving groove. The filter structure can filter large particles in the emissions, reduce the clogging of the pressure relief area by the emissions, and reduce the amount of sparks carried in the discharged emissions, thereby reducing the possibility of thermal runaway propagation.

[0021] In some embodiments of this application, the plurality of second parts include a first sub-part and a second sub-part. The first sub-part is connected to the first wall and forms the connecting portion, and the second sub-part is spaced apart from the first wall. The insulating member may have at least one first sub-part and one second sub-part. The first sub-part is used to connect and fix the outer shell to the support member. Based on the first sub-part, the support member also has a second sub-part, which can improve the strength of the support member. Furthermore, the second sub-part may only have a supporting and reinforcing function, reducing the number of connection points between the support member and the outer shell. This improves the supporting strength of the support member while reducing the complexity of the connection operation between the support member and the outer shell, thus improving the assembly efficiency of the support member and the outer shell.

[0022] In some embodiments of this application, at least two first sub-parts are provided, and at least one second sub-part is provided between two adjacent first sub-parts along the arrangement direction of the plurality of second sub-parts. Providing second sub-parts between adjacent first sub-parts of the support member can improve the strength of the support member, and the second sub-parts can only have a supporting and reinforcing function, reducing the number of connection points between the support member and the shell. This can improve the supporting strength of the support member while reducing the complexity of the connection operation between the support member and the shell, and improving the assembly efficiency of the support member and the shell.

[0023] In some embodiments of this application, the insulating member includes a boss protruding toward the electrode assembly, and the receiving groove and the receiving groove are disposed on the boss. The boss protrudes toward the electrode assembly and can abut against the end face of the electrode assembly facing the first wall. This creates a gap between the two bosses and between the first wall and the end face of the electrode assembly for assembling the tabs, reducing the possibility of interference between the tabs and the insulating member. Simultaneously, a support member is provided at the location of the boss via the receiving groove, allowing for efficient use of the structural space.

[0024] In some embodiments of this application, the melting point of the support member is greater than that of the insulating member; and / or, the rigidity of the support member is greater than that of the insulating member; and / or, the support member is a rigid member; and / or, the insulating member is an elastic soft member; and / or, the support member is a metal member.

[0025] In some embodiments of this application, the connecting portion is welded to the first wall; and / or, a heat-resistant insulating structure is connected to the side of the support member facing away from the first wall. When a battery cell experiences thermal runaway, the high-temperature insulating structure is less likely to melt, which not only reduces the possibility of damage to the support member from emissions and improves the support member's support for the electrode assembly; but also, after the insulating support member melts, the high-temperature insulating structure can remain between the support member and the electrode assembly, providing insulation and isolation, reducing the possibility of short circuits between the support member and the electrode assembly, and mitigating the hazards caused by thermal runaway.

[0026] A second aspect of this application provides a battery device comprising a plurality of battery cells as described in this application or any embodiment thereof.

[0027] The battery device according to this application has the same beneficial effects as the battery cell proposed in this application or any embodiment of this application.

[0028] A third aspect of this application proposes an energy storage device comprising a plurality of battery cells or a battery device as proposed in this application or any embodiment thereof, wherein the battery cells or the battery device are used to store electrical energy or provide electrical energy.

[0029] The energy storage device according to this application has the same beneficial effects as the battery cell proposed in this application or any embodiment of this application.

[0030] A fourth aspect of this application provides an energy storage system including a power conversion device and an energy storage device according to this application or any embodiment thereof, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0031] The energy storage system according to this application has the same beneficial effects as the battery cell proposed in this application or any embodiment of this application.

[0032] The fifth aspect of this application proposes a charging network including a charging pile and an energy storage device or energy storage system according to this application or any embodiment thereof, the energy storage device being used to provide electrical energy to the charging pile.

[0033] The charging network according to this application has the same beneficial effects as the battery cell proposed in this application or any embodiment of this application.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of a charging network proposed in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of an energy storage system proposed in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of an energy storage device proposed in some embodiments of this application; Figure 4 This is a schematic diagram of the battery device proposed in some embodiments of this application; Figure 5 This is a schematic diagram of the battery cell as proposed in some embodiments of this application; Figure 6 This is an assembly structure diagram of the first wall, insulating member, and supporting member proposed in some embodiments of this application; Figure 7 for Figure 6 AA section view; Figure 8 This is a schematic diagram showing the separation of the first wall, the insulating member, and the supporting member according to some embodiments of this application; Figure 9 for Figure 7 Enlarged view of part C; Figure 10 This is a schematic diagram of the structure of the insulating component of a battery cell proposed in some embodiments of this application; Figure 11 for Figure 10 Enlarged view of part D; Figure 12 for Figure 10 Enlarged view of part E; Figure 13 This is a schematic diagram from one perspective of the insulating component of a battery cell proposed in some embodiments of this application; Figure 14 for Figure 13 BB cross-sectional view; Figure 15 This is a schematic diagram of the structure of the first support member of a battery cell according to some embodiments of this application; Figure 16 This is a schematic diagram from one perspective of the first support member of a battery cell proposed in some embodiments of this application; Figure 17 This is a schematic diagram from another perspective of the first support member of a battery cell proposed in some embodiments of this application; Figure 18 This is a schematic diagram from another perspective of the first support member of a battery cell proposed in some embodiments of this application; Figure 19 This is a schematic diagram of the structure of the second support member of a battery cell proposed in some embodiments of this application; Figure 20 This is a schematic diagram from one perspective of the second support member of a battery cell proposed in some embodiments of this application; Figure 21 This is a schematic diagram from another perspective of the second support member of a battery cell proposed in some embodiments of this application; Figure 22 This is another schematic diagram of the second support member of a battery cell proposed in some embodiments of this application.

[0036] The reference numerals in the detailed embodiments are as follows: 1000, Charging network; 2000, Energy storage system; 3000, Power generation device; 100. Battery assembly; 101. Battery housing; 102. First housing; 103. Second housing; 104. Battery cell assembly; 105. Receiving cavity; 10. Battery cell; 111. Electrode assembly; 112. Housing; 1121. Shell; 1122. End cap; 1123. First wall; 1124. Injection hole; 113. Tab; 114. Electrode terminal; 115. Pressure relief mechanism; 116. Pressure relief area; 120. Support member; 1201. Second support member; 1202. First support member; 1203. Support body; 121. First part; 1211. Corner area; 1212. Second notch; 1213. Second discharge hole; 1214. Support body; 122. Second part; 1221. First sub-part; 1222. Second sub-part; 123. Connection 1231, Chamfer; 124, First discharge hole; 1241, First sub-discharge hole; 1242, Second sub-discharge hole; 130, Insulating component; 131, Receiving groove; 1310, Connecting hole; 1311, First connecting hole; 1312, Third connecting hole; 1314, First receiving groove; 1315, Second receiving groove; 132, Boss portion; 133, Connecting component; 134, Receiving portion; 135, Receiving groove; 1351, First groove wall; 1352, First notch; 136, Exhaust area; 1361, Insulating solid portion; 1362, Second connecting hole; 1371, First through hole; 1372, Second through hole; 200. Energy storage device; 210. Energy storage container; 300, charging piles; 400. Energy storage converter. Detailed Implementation

[0037] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly defined.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0043] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] With the booming development of the new energy industry, large-capacity battery devices are becoming increasingly common, leading to higher performance requirements. A battery device typically consists of one or more individual battery cells. External short circuits, overcharging, punctures, and flat-plate impacts can easily trigger thermal runaway in battery devices. After thermal runaway, high-temperature emissions are generated within the battery cells, including high-temperature fumes, molten metal, and sparks. Pressure relief zones can be installed on the casing of the battery cells. In the event of thermal runaway, these zones are activated to release pressure, allowing for the timely discharge of high-temperature fumes and particulate matter, thus reducing the risk of explosion.

[0046] Research has found that even when a battery cell experiences thermal runaway, emissions cannot be released in a timely manner, leading to more serious hazards such as fires and explosions. Further research has revealed that during thermal runaway, electrode components may move towards the pressure relief area under the impact of gases or other emissions, blocking the pressure relief channel or area between the electrode components and the casing. This prevents timely emission of emissions and ensures the battery cell cannot depressurize properly.

[0047] Some technologies propose placing a support between the electrode assembly and the casing to support the electrode assembly in the event of thermal runaway in a single battery cell, thereby reducing the possibility of electrode assembly displacement. However, further research has found that while the support provides good support during thermal runaway, actual testing has shown that the reliability of battery cells with the support is reduced.

[0048] In-depth research revealed that the support component may generate debris due to friction with the outer casing, and debris may also be generated during the assembly process of the support component and the outer casing. These debris can affect the reliability of the battery cell. For example, if the support component or the outer casing is made of metal, metal debris may be generated. The presence of metal debris can easily cause short circuits between the electrode assembly and the outer casing, thus affecting the reliability of the battery cell.

[0049] Based on the above research, in order to mitigate the impact of the support member on the battery cell and improve the reliability of the battery cell, this application provides a battery cell. The battery cell includes a shell and an electrode assembly disposed within the shell. The shell has a first wall, and an insulating member is disposed between the first wall and the electrode assembly. A support member is disposed between the insulating member and the first wall. The support member is connected to the shell, and a receiving portion is disposed on the insulating member corresponding to the connection position between the support member and the shell. In this application, the insulating component of the battery cell provides protection between the first wall and the electrode assembly, reducing the possibility of a short circuit between them. By providing a support component between the insulating component and the first wall, the support component can effectively support the electrode assembly in the event of thermal runaway in the battery cell, reducing the possibility of the electrode assembly shifting due to emissions. By connecting the support component to the outer casing, the possibility of friction debris generated by the support component's movement relative to the casing is reduced. A receiving portion is provided on the insulating component; simultaneously, this receiving portion can catch debris generated during assembly and connection operations or friction between the support component and the outer casing, reducing the possibility of debris entering the electrode assembly area and thus reducing the likelihood of debris causing a short circuit or other adverse effects on the battery cell, thereby improving the reliability of the battery cell.

[0050] The battery cells or battery devices disclosed in this application are applicable to various electrical devices that use battery devices, and power systems for these devices can be formed using the battery devices disclosed in this application. These electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0051] The battery device disclosed in this application can also be applied to energy storage equipment such as energy storage containers or energy storage cabinets.

[0052] Please refer to Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the charging network structure proposed in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of an energy storage device proposed in some embodiments of this application. Embodiments of this application propose a charging network 1000, which includes a charging pile 300 for charging electrical equipment. The charging network 1000 may further include an energy storage device 200, which is electrically connected to the charging pile 300 and provides power to the charging pile 300.

[0053] It should be noted that the charging pile 300 and the battery cells in the energy storage device 200 are electrically connected via cables, and the battery cells can supply their stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's power. The application of the energy storage device 200 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to enhance the flexibility of the charging network 1000 during deployment.

[0054] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides power to the one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides power to multiple charging piles 300.

[0055] As an example, such as Figure 1 As shown, the charging network 1000 includes an energy storage device 200 and two charging piles 300, with the energy storage device 200 providing power to the two charging piles 300.

[0056] The energy storage device 200 may include a battery device 100, which is electrically connected to the charging pile 300 so that the battery device 100 can provide power to the charging pile 300.

[0057] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of an energy storage system proposed in some embodiments of this application. Embodiments of this application propose an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which can be electrically connected to a generator 3000 to convert the electrical power provided by the generator 3000. The energy storage system 2000 may further include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0058] The energy storage converter 400 can be a power conversion device connected between the power generation device 3000 and the energy storage device 200. The power generation device 3000 generates electrical energy and stores it in the energy storage device 200 via the power conversion device. The application of the energy storage device 200 in the energy storage system 2000 effectively improves the operational safety of the energy storage system 2000. In specific implementations, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0059] As an example, such as Figure 2 As shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 400, and the energy storage converter 400 introduces the electrical energy into the energy storage device 200 for storage.

[0060] Please refer to Figure 3 The energy storage device 200 includes an energy storage box 210, and a battery device 100 is installed inside the energy storage box 210.

[0061] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0062] As an example, energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 200. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 200, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0063] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 104 for providing voltage and capacity. The battery cell assembly 104 may include a plurality of battery cells 10, which are connected in series, parallel, or mixed connection via a busbar.

[0064] In some embodiments, the battery cell assembly 104 is typically formed by arranging a plurality of battery cells 10.

[0065] As an example, the battery cell assembly 104 can be a battery module, which is formed by arranging and fixing multiple battery cells 10 into an independent module. As an example, the battery module can be formed by binding multiple battery cells 10 together with cable ties.

[0066] In some embodiments, such as Figure 4 As shown, Figure 4 This is a schematic diagram of the battery device according to some embodiments of this application. The battery device 100 can be a battery pack, which includes a battery housing 101 and one or more individual battery cells, which are housed in the battery housing 101.

[0067] As an example, the battery cell assembly 104 can be a battery module, and the battery cell assembly 104 can be housed in the battery housing 101 by fixing the battery module in the battery housing 101.

[0068] As an example, the battery cell assembly 104 can also be housed in the battery housing 101 by directly fixing multiple battery cells 10 to the battery housing 101.

[0069] As an example, such as Figure 4As shown, the battery housing 101 may include a first housing 102 and a second housing 103. The first housing 102 and the second housing 103 are fastened together, forming a closed space inside the battery housing 101 to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 102 may be a top cover or a bottom plate.

[0070] As an example, the battery housing 101 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the battery housing 101 forms an enclosed space to accommodate the battery cell assembly 104.

[0071] In some embodiments, the battery housing 101 may be part of the vehicle's chassis structure. For example, a portion of the battery housing 101 may be at least a portion of the vehicle's floor, or a portion of the battery housing 101 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0072] In this embodiment of the application, the battery cell 10 can be a secondary battery, which refers to the battery cell 10 that can be used again after being discharged by recharging to activate the active material.

[0073] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0074] like Figure 5 As shown, Figure 5 This is a schematic diagram of the battery cell according to some embodiments of this application. The battery cell 10 may include a housing 112 and an electrode assembly 111, with the electrode assembly 111 disposed inside the housing 112.

[0075] The electrode assembly 111 may include a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0076] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0077] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0078] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0079] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0080] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0081] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0083] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0084] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 10. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0085] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0086] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0087] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0088] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0089] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0090] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0091] The electrode assembly 111 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0092] In some embodiments, the electrode assembly 111 has a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0093] In some embodiments, the electrode assembly 111 has a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive electrodes and multiple negative electrodes being stacked alternately.

[0094] In some embodiments, the electrode assembly 111 may be cylindrical, flat, or polygonal in shape.

[0095] In some embodiments, the electrode assembly 111 is provided with tabs 113, which can conduct current from the electrode assembly 111. The tabs 113 include a positive tab and a negative tab.

[0096] The battery cell 10 also includes an electrolyte, which is disposed within the casing 112 and serves to conduct ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0097] The outer casing 112 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite casing 112), or aluminum-plastic film, etc. In some embodiments, the outer casing 112 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 112 is a non-sealed structure, the outer casing 112 serves to protect the electrode assembly 111, and a sealing bag is also included between the outer casing 112 and the electrode assembly 111. The sealing bag is used to encapsulate the electrode assembly 111 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 112 is a sealed structure, it is used to encapsulate the electrode assembly 111 and electrolyte components, etc.

[0098] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0099] In some embodiments, the housing 112 includes an end cap 1122 and a housing 1121, the housing 1121 having an opening, and the end cap 1122 covering the opening. The housing 1121 may have one or more openings. The end cap 1122 may also have one or more.

[0100] In some embodiments, at least one electrode terminal 114 is provided on the housing 112, and the electrode terminal 114 is electrically connected to the tab 113. The electrode terminal 114 can be directly connected to the tab 113, or it can be indirectly connected to the tab 113 through a current collector. The electrode terminal 114 can be provided on the end cover 1122, or it can be provided on the housing 1121.

[0101] In some embodiments, a pressure relief area 116 is provided on the housing 112, and a pressure relief mechanism 115 is provided in the pressure relief area 116. The pressure relief mechanism 115 is used to discharge the internal gas of the battery cell 10.

[0102] As an example, the internal pressure or temperature of the battery cell 10 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches the predetermined threshold, the pressure relief mechanism 115 is activated or a weak structure provided in the pressure relief mechanism 115 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 10.

[0103] As an example, the pressure relief mechanism 115 can be integrally formed with the housing 112.

[0104] As an example, the pressure relief mechanism 115 can also be separately configured and connected to the housing 112.

[0105] As an example, the pressure relief mechanism 115 can be provided on the end cap 1122.

[0106] The term "actuation" as used in this application refers to the pressure relief mechanism 115 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 10. The actions of the pressure relief mechanism 115 may include, but are not limited to: movement of components within the pressure relief mechanism 115 to form a discharge channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 115, etc. When the pressure relief mechanism 115 is actuated, the high-temperature, high-pressure substances inside the battery cell 10 are discharged outwards from the actuated portion as discharge materials. In this way, the battery cell 10 can be depressurized and de-temperatureed under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0107] In some embodiments, when the housing 112 is a non-sealed structure, the pressure relief mechanism 115 can be configured as a through hole for discharging gas inside the battery cell 10.

[0108] The emissions from the battery cell 10 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0109] The battery cell 10 may also include an insulating film, which can cover the outside of the electrode assembly 111 and be located inside the housing 112, and can contact the inner wall surface of the housing 112. The insulating film can be a MYLAR film, i.e., a polyester film, which is a film structure formed by a tough polyester polymer and has good insulation and heat resistance. The insulating film can also serve as a protective layer for the electrode cell, effectively preventing leakage of internal substances of the battery cell 10, and can also serve as a separator, effectively isolating the electrode assembly 111 from the housing 112, reducing short circuits inside the battery cell 10.

[0110] The battery cell 10 may also include an insulating component 130. The insulating component 130 may be located between the wall of the housing 112 where the pressure relief mechanism 115 is provided (e.g., end cap 1122) and the electrode assembly 111. The insulating component 130 may be a plastic component, which may be pre-molded as a single piece of plastic or assembled from various plastic parts, and the material is an insulating material. The insulating component 130 may also be a component made of other materials, such as rubber. The insulating component 130 has two main functions: first, it can isolate the electrical connection components inside the housing 112 from the housing 112 (specifically, the end cap 1122) to reduce the risk of short circuits; second, it can effectively support the end face of the electrode assembly 111. After the electrode assembly 111 is installed in the housing and the end cap 1122 is welded, the internal core of the electrode assembly 111 is under slight pressure. Moreover, the electrode assembly 111 will be in a vibrating environment during vehicle use. If the electrode assembly 111 is not sufficiently restrained, it will easily affect the life of the core or cause a short circuit. Therefore, the insulating component 130 needs to effectively support the end face of the core to reduce the possibility of the electrode assembly 111 moving up and down.

[0111] The insulating element 130 may be provided with an opening corresponding to the pressure relief mechanism 115 so that the discharged material can flow to the pressure relief mechanism 115 through the opening.

[0112] A pressure relief cavity may be provided between the insulating component 130 and the electrode assembly 111. When the battery cell 10 experiences thermal runaway, the emissions inside can flow from the pressure relief cavity to the pressure relief mechanism 115.

[0113] A gap may be provided between the electrode assembly 111 and the housing 112. This gap can serve as a pressure relief channel. When the battery cell 10 experiences thermal runaway, the emissions that are far from the pressure relief mechanism 115 can flow from the pressure relief channel to the pressure relief mechanism 115.

[0114] like Figure 5 and combined Figures 6 to 14 As shown, Figure 6 This is an assembly structure diagram of the first wall 1123, the insulating member 130, and the support member 120 according to some embodiments of this application. Figure 7 for Figure 6 AA section view, Figure 8 This is a schematic diagram showing the components of the first wall 1123, the insulating member 130, and the supporting member 120 in some embodiments of this application. Figure 9 for Figure 7 Enlarged view of part C, Figure 10 This is a schematic diagram of the structure of the insulating member 130 of the battery cell 10 according to some embodiments of this application. Figure 11 for Figure 10 Enlarged view of part D, Figure 12 for Figure 10 Enlarged view of part E, Figure 13This is a schematic diagram from one perspective of the insulating member 130 of the battery cell 10 according to some embodiments of this application. Figure 14 for Figure 13 The present application provides a battery cell 10, including a housing 112, an electrode assembly 111, an insulating member 130, and a support member 120. The housing 112 has a first wall 1123 and a receiving cavity 105, and the electrode assembly 111 is disposed in the receiving cavity 105. The insulating member 130 is disposed between the first wall 1123 and the electrode assembly 111, and the insulating member 130 has a receiving portion 134. The support member 120 is disposed between the insulating member 130 and the first wall 1123, and the support member 120 has a connecting portion 123 connected to the first wall 1123. Along the arrangement direction from the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), at least a portion of the projection of the connecting portion 123 on the electrode assembly 111 falls within the projection of the receiving portion 134 on the electrode assembly 111.

[0115] The first wall 1123 can be any wall of the outer casing 112, including the end cap 1122 and any wall of the casing 1121. In some embodiments, the first wall 1123 is a wall of the outer casing 112 that is provided with a pressure relief mechanism 115. Specifically, the first wall 1123 is provided with a pressure relief area 116, and the pressure relief area 116 is provided with the pressure relief mechanism 115.

[0116] The insulating member 130 can be aligned with the first wall 1123. Along the arrangement direction of the first wall 1123 to the electrode assembly 111 (refer to the third direction Z), the projection of the first wall 1123 onto the insulating member 130 can be located within the insulating member 130.

[0117] In some embodiments, such as Figures 6 to 8 , Figure 10 , Figure 13 and Figure 14 As shown, an electrode terminal 114 is provided on the first wall 1123, and a first through hole 1371 is provided on the insulating member 130 corresponding to the electrode terminal. The electrode terminal 114 passes through the first through hole 1371 and is connected to the tab 113 of the electrode assembly 111. Optionally, an injection hole 1124 is provided on the first wall 1123, and a second through hole 1372 is provided on the insulating member 130 corresponding to the injection hole 1124. The injection hole 1124 communicates with the second through hole 1372 so that the electrolyte can flow from the injection hole 1124 through the first through hole 1371 and enter the area where the electrode assembly 111 is located inside the housing 1121.

[0118] A support member 120 is disposed within the housing 112. The support member 120 can have a certain supporting strength so that it can support the electrode assembly 111 within the housing 1121. One or multiple support members 120 can be provided. When multiple support members 120 are provided, they can be spaced apart and dispersed. The structures of the multiple support members 120 can be identical or different.

[0119] The connecting portion 123 is the part of the support member 120 used to connect with the first wall 1123. The connecting portion 123 of the support member 120 can be directly connected to the first wall 1123, or it can be indirectly connected through a transition member. For example, the connecting portion 123 is connected to the first wall 1123 by means of bonding, welding, or the like.

[0120] The projection of at least a portion of the connecting portion 123 onto the electrode assembly 111 can be understood as at least a portion of the orthographic projection of the connecting portion 123 onto the electrode assembly 111 along the arrangement direction of the first wall 1123 and the electrode assembly 111 (referring to the third direction Z). The projection of the receiving portion 134 onto the electrode assembly 111 can be understood as the orthographic projection of the receiving portion 134 onto the electrode assembly 111 along the arrangement direction of the first wall 1123 and the electrode assembly 111 (referring to the third direction Z). The fact that at least a portion of the projection of the connecting portion 123 onto the electrode assembly 111 falls within the projection of the receiving portion 134 onto the electrode assembly 111 can be understood as at least a portion of the connecting portion 123 facing the receiving portion 134 and isolated by the receiving portion 134 on the side away from the electrode assembly 111.

[0121] Optionally, at least one tab 113 of the electrode assembly 111 is disposed toward the first wall 1123, and an electrode terminal 114 is disposed on the first wall 1123. The support member 120 is disposed to avoid the tab 113 and the electrode terminal 114.

[0122] For example, along the length direction of the first wall 1123, at least one side of the tab 113 or electrode terminal 114 is provided with a support member 120, the support member 120 being spaced apart from the tab 113 and from the electrode terminal 114.

[0123] For example, the electrode assembly 111 is provided with a positive electrode tab 113 and a negative electrode tab 113 facing the first wall 1123. The positive electrode tab 113 and the negative electrode tab 113 are spaced apart along the length direction of the first wall 1123. The pressure relief area 116 is located between the positive electrode tab 113 and the negative electrode tab 113. A support member 120 (refer to the second support member 1201) is provided on the side of the positive electrode tab 113 away from the negative electrode tab 113. A support member 120 (refer to the second support member 1201) is provided on the side of the negative electrode tab 113 away from the positive electrode tab 113. A support member 120 (refer to the first support member 1202) is provided at the corresponding position of the pressure relief area 116.

[0124] Optionally, a liquid injection hole 1124 is provided on the first wall 1123. The liquid injection hole 1124 is used to inject electrolyte into the outer casing 112, and the support member 120 is disposed to avoid the liquid injection hole 1124. Exemplarily, along the length direction of the first wall 1123, a support member 120 is provided on one or both sides of the liquid injection hole 1124, and the support member 120 is spaced apart from the liquid injection hole 1124.

[0125] For example, a support member 120 may be provided, which is located at the middle of the first wall 1123 along its length direction (referring to the first direction X). The middle refers to the center line of the first wall 1123 along its length direction (referring to the first direction X) and a portion of the area on both sides of the center line.

[0126] For example, the support member 120 can be provided as two, and the two support members 120 can be located on both sides of the center line of the length direction (refer to the first direction X) of the first wall 1123, specifically, they can be set close to the two ends of the length direction of the first wall 1123.

[0127] For example, such as Figures 7 to 9 As shown, the support member 120 can be set to three. Two support members 120 can be located on both sides of the center line of the length direction (refer to the first direction X) of the first wall 1123, specifically close to both ends of the length direction of the first wall 1123. The other support member 120 is located in the middle of the length direction of the first wall 1123. The more support members 120 there are, the better the support effect.

[0128] It should be noted that the number of support members 120 can be set as needed. Generally, the larger the capacity of the battery cell 10 or the larger the length of the first wall 1123, the more support members 120 can be configured.

[0129] For example, along the arrangement direction of the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), the projection of the support member 120 onto the insulator 130 is located within the insulator 130, and the side of the support member 120 facing the electrode terminal 114 is completely covered by the insulator 130.

[0130] For example, along the arrangement direction of the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), the projection of the support 120 onto the first wall 1123 is located within the first wall 1123, and the side of the support 120 facing the first wall 1123 can be completely blocked by the first wall 1123.

[0131] The receiving part 134 may be part of the structure of the insulating part 130 itself. The receiving part 134 is located between the electrode assembly 111 and the connecting part 123, and it can isolate the connecting part 123 from the electrode assembly 111.

[0132] For example, refer to Figures 7 to 9 , Figures 10 to 14 As shown, a receiving portion 134 is formed on the side of the insulating member 130 facing away from the electrode assembly 111.

[0133] In this embodiment, under normal use, the insulating member 130 of the battery cell 10 can provide protection between the first wall 1123 and the electrode assembly 111, reducing the possibility of a short circuit between the first wall 1123 and the electrode assembly 111. By providing a support member 120 between the insulating member 130 and the first wall 1123, the support member 120 can provide better support for the electrode assembly 111 when the battery cell 10 experiences thermal runaway, reducing the possibility of the electrode assembly 111 shifting due to the influence of emissions. The support member 120 is connected to the first wall 1123 via the connecting part 123, which reduces the possibility of friction debris generated due to the movement of the support member 120 relative to the first wall 1123. Furthermore, a receiving part 134 is provided on the insulating member 130. At least part of the projection of the connecting part 123 on the electrode assembly 111 falls within the projection of the receiving part 134 on the electrode assembly 111. The receiving part 134 can receive debris (e.g., welding slag, metal wires or metal fragments generated by friction) generated between the connecting part 123 and the first wall 1123 due to assembly connection operations or friction, reducing the possibility of debris entering the area where the electrode assembly 111 is located, reducing the possibility of debris causing short circuits or other adverse effects on the battery cell 10, and improving the reliability of the battery cell 10.

[0134] like Figures 6 to 14 As shown, according to some embodiments of this application, optionally, the receiving portion 134 is provided with a receiving groove 135, the groove opening of the receiving groove 135 is provided facing the connecting portion 123, and along the arrangement direction of the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), at least a portion of the projection of the connecting portion 123 on the electrode assembly 111 falls into the projection of the receiving groove 135 on the electrode assembly 111.

[0135] The receiving groove 135 can be a groove structure with a certain depth formed by a partial recess in the insulating member 130. The receiving part 134 can include the receiving groove 135 and the area surrounding the insulating member 130 that forms the receiving groove 135.

[0136] The opening of the receiving groove 135 is positioned facing the connecting part 123, so that the debris generated by the connection or friction between the connecting part 123 and the first wall 1123 can enter the receiving groove 135 and be collected or hidden by the receiving groove 135, reducing the possibility of short circuit caused by debris in the battery cell 10 and improving the reliability of the battery cell 10.

[0137] According to some embodiments of this application, optionally, the side of the connecting portion 123 away from the electrode assembly 111 contacts and connects with the side of the first wall 1123 facing the electrode assembly 111 to form a connecting area. Along the arrangement direction of the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), the projection of the connecting area on the electrode assembly 111 falls into the projection of the receiving groove 135 on the electrode assembly 111.

[0138] The connection area is the location where the connecting part 123 is connected to the first wall 1123. For example, the connecting part 123 is welded to the first wall 1123, and the connection area is the welding area between the connecting part 123 and the first wall 1123.

[0139] The receiving groove 135 can isolate the connection area from the electrode assembly 111 along the arrangement direction of the first wall 1123 and the electrode assembly 111 (refer to the third direction Z).

[0140] The connection area is prone to accumulating debris (such as welding slag). By correspondingly setting the connection area with the receiving groove 135, the receiving groove 135 can collect or hide the debris in the connection area, reducing the possibility of short circuits caused by debris affecting the battery cell 10 and improving the reliability of the battery cell 10.

[0141] According to some embodiments of this application, optionally, such as Figures 7 to 14 As shown, the insulating member 130 has a receiving groove 131 on the side facing the first wall 1123, and the support member 120 is at least partially disposed in the receiving groove 131.

[0142] An accommodating groove 131 is provided on the side of the insulating member 130 facing the first wall 1123. This can be understood as the insulating member 130 having an accommodating groove 131, and the opening of the accommodating groove 131 passing through the side of the insulating member 130 facing the first wall 1123. In other words, the opening of the accommodating groove 131 faces the first wall 1123, and the side of the insulating member 130 facing the first wall 1123 is recessed to form the accommodating groove 131.

[0143] The support member 120 may include a support body 1203, a connecting portion 123 connected to the support body 1203, and the support body 1203 disposed in the receiving groove 131. In some implementations, the connecting portion 123 may be at least partially disposed within the receiving groove 131. That is, along the third direction Z, the orthographic projection of the connecting portion 123 onto the insulating member 130 is at least partially located within the receiving groove 131. The area where the bottom wall of the receiving groove 131 overlaps with the orthographic projection of the connecting portion 123 (the orthographic projection of the connecting portion 123 onto the insulating member 130) can serve as a receiving portion 134. The receiving portion 134 may be a solid wall structure of the bottom wall of the receiving groove 131, or it may be a groove structure formed by further recessing the bottom wall of the receiving groove 131. In some other implementations, the connecting portion 123 and the receiving portion 134 may be located outside the receiving groove 131. That is, along the third direction Z, the orthographic projection of the connecting portion 123 onto the insulating member 130 is at least partially located outside the receiving groove 131. The area of ​​the insulating member 130 located outside the receiving groove 131 that coincides with the orthographic projection of the connecting portion 123 (the orthographic projection of the connecting portion 123 onto the insulating member 130) can serve as the receiving portion 134. The receiving portion 134 may be a partially recessed groove of the insulating member 130 (refer to receiving groove 135).

[0144] The insulating member 130 has a receiving groove 131, and the support member 120 is at least partially disposed within the receiving groove 131, which improves the assembly reliability and convenience between the support member 120 and the insulating member 130. Furthermore, the insulating member 130 can cover the support member 120 through the receiving groove 131, reducing the possibility of the support member 120 being exposed and short-circuiting with the electrode assembly 111, thus improving the reliability of the battery cell 10.

[0145] According to some embodiments of this application, optionally, such as Figure 7 , Figure 9 , Figures 10 to 14 As shown, along the arrangement direction of the first wall 1123 and the insulating member 130 (referring to the third direction Z), the bottom wall of the receiving groove 131 is spaced apart from the support member 120.

[0146] The bottom wall of the receiving groove 131 is positioned opposite to the opening of the receiving groove 131, and the bottom wall of the receiving groove 131 is spaced apart from the support member 120. This means that when the battery cell 10 is in its normal state, the bottom wall of the receiving groove 131 and the support member 120 are spaced apart. In some special cases, such as when the battery cell 10 shakes, the support member 120 may also be positioned to abut against the bottom wall of the receiving groove 131.

[0147] The maximum dimension of the support member 120 along the third direction Z is smaller than the depth of the receiving groove 131 along the third direction Z. Since the support member 120 is connected to the first wall 1123 through the connecting part 123, one end of the support member 120 facing the first wall 1123 along the third direction Z is fixed, and the other end of the support member 120 can be spaced apart from the bottom wall of the receiving groove 131. In the third direction Z, the support member 120 does not protrude from the receiving groove 131. In the third direction Z, the gap between the support member 120 and the receiving groove 131 can also reserve a certain margin for the elastic deformation of the insulating member 130, so that the insulating member 130 can have a buffer support effect on the electrode assembly 111 through elastic deformation.

[0148] By spacing the bottom walls of the receiving groove 131 of the support member 120 and the insulating member 130, the assembly reliability and convenience between the support member 120 and the insulating member 130 are improved, the possibility of the support member 120 interfering with the assembly between the insulating member 130 and the first wall 1123 is reduced, and the insulating member 130 can be abutted and connected to the first wall 1123, so that the insulating member 130 can play a supporting and buffering role between the first wall 1123 and the electrode assembly 111.

[0149] According to some embodiments of this application, optionally, such as Figures 7 to 14 As shown, along the direction intersecting the arrangement direction of the first wall 1123 and the insulating member 130, the receiving part 134 is disposed on one side of the receiving groove 131. The support member 120 includes a support body 1203, which is disposed in the receiving groove 131. The connecting part 123 is connected to one end of the support body 1203 facing the first wall 1123. Along the direction intersecting the arrangement direction of the first wall 1123 and the insulating member 130, one end of the connecting part 123 is connected to the support body 1203, and the other end of the connecting part 123 extends in the receiving part 134 in a direction away from the support body 1203.

[0150] The arrangement direction of the first wall 1123 and the insulating member 130 can be referenced to the third direction Z. The direction intersecting the arrangement direction of the first wall 1123 and the insulating member 130 can be any direction that is approximately perpendicular to the third direction Z. Specifically, the direction intersecting the arrangement direction of the first wall 1123 and the insulating member 130 can be any direction that is approximately parallel to the plane containing the first wall 1123.

[0151] like Figures 7 to 11 As shown, by way of example, at least one of the support members 120 is a second support member 1201. The second support member 1201 has connecting portions 123 at both ends along the second direction Y. The insulating member 130 has receiving portions 134 on both sides of the receiving groove 131 along the second direction Y. The connecting portions 123 and the receiving portions 134 are provided in a one-to-one correspondence.

[0152] like Figures 7 to 10 and combined Figure 12 As shown, by way of example, one of the support members 120 is a second support member 1201. The second support member 1201 is provided with connecting portions 123 at both ends along the first direction X. The insulating member 130 is provided with receiving portions 134 on both sides of the receiving groove 131 along the first direction X. The connecting portions 123 and the receiving portions 134 are provided in a one-to-one correspondence.

[0153] The connecting portion 123 is located on one side of the supporting body 1203, reducing the possibility of interference from the supporting body 1203 when the connecting portion 123 is assembled with the first wall 1123, and improving the ease of assembly between the connecting portion 123 and the first wall 1123. The supporting body 1203 is disposed in the receiving groove 131, and the connecting portion 123 is correspondingly disposed with the receiving portion 134 disposed on one side of the receiving groove 131, reducing the interference of the supporting member 120 with the first wall 1123 and the insulating member 130, and improving the ease of assembly between the first wall 1123 and the insulating member 130. In addition, by disposing the receiving portion 134 on one side of the receiving groove 131, the freedom of arrangement of the receiving groove 131 and the receiving portion 134 is increased, and the molding of the insulating member 130 is more convenient.

[0154] According to some embodiments of this application, optionally, such as Figures 7 to 14 As shown, the receiving part 134 is provided with a receiving groove 135. The opening of the receiving groove 135 is facing the first wall 1123. A first groove wall 1351 is provided between the receiving groove 135 and the receiving groove 131. The first groove wall 1351 and the first wall 1123 are spaced apart to form a first notch 1352. The first notch 1352 connects the receiving groove 135 and the receiving groove 131. The connecting part 123 passes through the first notch 1352.

[0155] For example, such as Figures 7 to 11 As shown, exemplarily, at least one support member 120 is a second support member 1201. The second support member 1201 has connecting portions 123 at both ends along the second direction Y. The insulating member 130 has receiving grooves 135 on both sides of the receiving groove 131 along the second direction Y. The connecting portions 123 and the receiving grooves 135 are arranged in a one-to-one correspondence. Along the second direction Y, a first groove wall 1351 is provided between each receiving groove 135 and the receiving groove 131. The first groove wall 1351 is partially recessed to form a first notch 1352. The connecting portion 123 can pass through the first notch 1352 and enter the receiving groove 135.

[0156] like Figures 7 to 10 and combined Figure 12As shown, exemplarily, one of the support members 120 is a second support member 1201. The second support member 1201 has connecting portions 123 at both ends along the first direction X. The insulating member 130 has receiving portions 134 on both sides of the receiving groove 131 along the first direction X. The connecting portions 123 and the receiving grooves 135 are arranged one-to-one. Along the first direction X, a first groove wall 1351 is provided between each receiving groove 135 and the receiving groove 131. The first groove wall 1351 is recessed to form a first notch 1352. The connecting portion 123 can pass through the first notch 1352 and enter the receiving groove 135.

[0157] By providing a first notch 1352 in the first groove wall 1351, assembly space can be provided for the connecting part 123, reducing the possibility of the connecting part 123 interfering with the assembly of the insulating part 130 and the first wall 1123, and improving the assembly convenience and reliability of the battery cell 10.

[0158] According to some embodiments of this application, optionally, along the arrangement direction of the first wall 1123 and the insulating member 130, the size of the first notch 1352 is h1 and the size of the connecting portion 123 is h2, wherein h1 is greater than h2.

[0159] Along the thickness direction of the connecting portion 123 (referring to the third direction Z), the size h1 of the first notch 1352 is greater than the thickness h2 of the connecting portion 123. The size of the first notch 1352 refers to the height difference between the first groove wall 1351 and the other groove walls of the receiving groove 135, that is, the height difference between the first groove wall 1351 and the side of the insulating member 130 facing the first wall 1123. The thickness h2 of the connecting portion 123 is the size of the connecting portion 123 on opposite sides along the third direction Z. When the connecting portion 123 has unequal thickness, the thickness h2 of the connecting portion 123 can be the largest size.

[0160] By setting the size h1 of the first notch 1352 to be greater than the thickness h2 of the connecting part 123, the connecting part 123 can be located in the first notch 1352 and does not protrude from the receiving groove 135, and thus does not protrude from the side of the insulating member 130 facing the first wall 1123, so that the insulating member 130 and the first wall 1123 can be in contact, and the insulating member 130 can play a supporting and buffering role between the first wall 1123 and the electrode assembly 111.

[0161] Optionally, h1 is 0.2 mm to 2 mm larger than h2. For example, h1 can be 0.2 mm, 0.3 mm, 0.5 mm, 1 mm, 1.5 mm or 2 mm larger than h2.

[0162] By setting the size h1 of the first notch 1352 to be slightly larger than the thickness h2 of the connecting part 123, the connecting part 123 can be located in the first notch 1352 and does not protrude from the receiving groove 135, and thus does not protrude from the side of the insulating member 130 facing the first wall 1123, so that the insulating member 130 and the first wall 1123 can be in contact, and the insulating member 130 can play a supporting and buffering role between the first wall 1123 and the electrode assembly 111.

[0163] According to some embodiments of this application, optionally, such as Figures 7 to 14 As shown, the first groove wall 1351 protrudes from the bottom wall of the receiving groove 135.

[0164] In other words, the first notch 1352 is spaced apart from the bottom wall of the receiving groove 135. The first groove wall 1351 has a certain height corresponding to the position of the first notch 1352, so that the receiving groove 135 can form a groove structure that surrounds all four sides, reducing the possibility of debris leaking from the receiving groove 135 and improving the reliability of the battery cell 10.

[0165] According to some embodiments of this application, optionally, a pressure relief area 116 is provided on the first wall 1123, a connecting hole 1310 is provided on the wall of the receiving groove 131, and a discharge hole is provided on the support body 1203, the discharge hole connecting the connecting hole 1310 and the pressure relief area 116.

[0166] The pressure relief zone 116 may be equipped with a pressure relief mechanism 115. The pressure relief zone 116 is a region used to discharge wastewater and relieve internal pressure in the battery cell 10 when thermal runaway occurs. The pressure relief zone 116 may be located at the middle of the first wall 1123 along its length direction (referring to the first direction X). It should be noted that the length dimension of the first wall 1123 is generally larger than its width dimension; that is, in this embodiment, the direction with the larger dimension of the first wall 1123 is defined as the length direction of the first wall 1123.

[0167] The accommodating groove 131 has a groove wall including an insulating protective component forming a groove side wall and a groove bottom wall. The groove side wall is connected to the groove bottom wall, and the groove bottom wall is arranged opposite to the groove opening.

[0168] For example, such as Figures 7 to 8 , Figure 10 , Figure 11 , Figure 13 and Figure 14As shown, the receiving groove 131 (refer to the first receiving groove 1314) is used to receive the first support member 1202. The first support member 1202 is arranged opposite to the pressure relief area 116. The side wall of the receiving groove 131 may be provided with a connecting hole 1310 (defined as the first connecting hole 1311 for ease of description). The first connecting hole 1311 may be a notch. The bottom wall of the receiving groove 131 may also be provided with a connecting hole 1310 (defined as the second connecting hole 1362 for ease of description). One or more of the first connecting hole 1311 and the second connecting hole 1362 may be provided respectively.

[0169] For example, such as Figures 7 to 8 , Figure 10 , Figure 12 , Figure 13 and Figure 14 As shown, the receiving groove 131 (refer to the second receiving groove 1315) is used to receive the second support member 1201. The second support member 1201 is offset from the pressure relief area 116. The groove sidewall of the receiving groove 131 may be provided with a connecting hole 1310 (defined as the third connecting hole 1312 for ease of description). The third connecting hole 1312 may be a notch, and one or more third connecting holes 1312 may be provided.

[0170] For example, along the circumference of the receiving groove 131, the connecting hole 1310 is offset from the receiving groove 135.

[0171] By providing a connecting hole 1310 on the receiving groove 131 and a discharge hole on the supporting body 1203, the pressure relief zone 116 can be connected to the area where the electrode assembly 111 is located inside the housing 1121, improving the timeliness of discharge and enhancing the reliability of the battery cell 10. Furthermore, in the event of the battery cell 10 being inverted or dropped, the electrolyte impacting the first wall 1123 can quickly flow back to the area where the electrode assembly 111 is located inside the housing 112 through the first discharge hole 124 and the connecting hole 1310, reducing the impact of the electrolyte on the pressure relief zone 116 and further improving the reliability of the battery cell 10.

[0172] like Figures 7 to 14 and combined Figures 15 to 22 As shown, Figure 15 This is a schematic diagram of the structure of the first support member 1202 of the battery cell 10 according to some embodiments of this application. Figure 16 This is a schematic diagram from one perspective of the first support member 1202 of the battery cell 10 according to some embodiments of this application. Figure 17 This is a schematic diagram from another perspective of the first support member 1202 of the battery cell 10 proposed in some embodiments of this application. Figure 18 This is another schematic diagram of the first support member 1202 of the battery cell 10 according to some embodiments of this application. Figure 19This is a schematic diagram of the structure of the second support member 1201 of the battery cell 10 according to some embodiments of this application. Figure 20 This is a schematic diagram from one perspective of the second support member 1201 of the battery cell 10 according to some embodiments of this application. Figure 21 This is a schematic diagram from another perspective of the second support member 1201 of the battery cell 10 proposed in some embodiments of this application. Figure 22 This is a schematic diagram from another perspective of the second support member 1201 of the battery cell 10 proposed in some embodiments of this application. According to some embodiments of this application, optionally, the discharge hole includes a first discharge hole 124, the support body 1203 includes a first part 121 and a plurality of second parts 122, the first part 121 and the plurality of second parts 122 are all located in the receiving groove 131, one end of the plurality of second parts 122 is connected to the first part 121, the other end of the plurality of second parts 122 extends toward the first wall 1123, at least one second part 122 is connected to a connecting part 123 at one end toward the first wall 1123, the plurality of second parts 122 are connected to the circumferential edge of the first part 121 and are spaced apart along the circumferential direction of the first part 121, and a first discharge hole 124 is provided between two adjacent second parts 122.

[0173] One end of the second part 122 can be connected to the first part 121 in various ways, such as welding, bonding, interference fit, snap-fit, one-piece molding connection, etc.

[0174] The gap between two adjacent second parts 122 can serve as a first discharge hole 124. The first discharge hole 124 can connect the area where the electrode assembly 111 is located inside the housing 112 and the area inside the housing 112 corresponding to the pressure relief area 116. When the pressure relief mechanism 115 is actuated, the first discharge hole 124 can connect the area where the electrode assembly 111 is located with the opening or channel formed by the pressure relief mechanism 115.

[0175] For example, such as Figure 8 , Figure 15 , Figure 19 As shown, the first part 121 is generally square, and at least one second part 122 is provided on any one of the four sides of the first part 121. When there are multiple second parts 122 on the same side, the multiple second parts 122 on the same side are spaced apart along the extension direction of the side, and adjacent second parts 122 on adjacent sides are spaced apart.

[0176] Multiple second parts 122 are connected to the circumferential edge of the first part 121 and are spaced apart circumferentially along the first part 121, so that the support member 120 can be integrally processed from a sheet metal, which is convenient to process, easy to form, and suitable for mass production in factories, thus improving production efficiency. For example, the processing of the support member 120 may be as follows: a sheet metal is provided, the main body of the sheet metal constitutes the first part 121, a local area of ​​the circumferential edge of the sheet metal is cut to form a gap, and then the portion of the circumferential edge of the sheet metal located on both sides of the gap is folded to form a first sub-part 1221. After folding, the gap forms a first discharge hole 124.

[0177] Optionally, the insulating member 130 is connected to the outer casing 112 via a connector 133. A second notch 1212 (the second notch 1212 is simply a gap for ease of description) is provided on the first part 121 of the second support member 1201, and the connector 133 passes through the second notch 1212. The connector 133 can be a heat-fused column. Exemplarily, both the connector and the second support member 1201 are disposed in the receiving groove 131 (refer to the receiving grooves 131 located at both ends of the insulating member 130 along the first direction X). Two connectors 133 can be provided within the same receiving groove 131, and the first part 121 of the second support member 1201 is provided with a second notch 1212 corresponding to each of the two connectors 133. The connecting column can be located at the corner of the receiving groove 131, and the second notch 1212 of the second support member 1201 can be formed at the corner of the first part 121. By setting the second notch 1212, the possibility of interference between the connector 133 and the second support 1201 is reduced, and the adjacent connection between the connector 133 and the second support 1201 can make reasonable use of the component space.

[0178] Multiple second portions 122 of the support member 120 are spaced apart, and a first discharge hole 124 can be formed between two adjacent second portions 122. When the battery cell 10 experiences thermal runaway, the emissions can flow to the pressure relief area 116 through the first discharge hole 124. Furthermore, by providing second portions 122 extending away from the electrode assembly 111 on the first portion 121 of the support member 120, the second portions 122 can serve as support feet for the support member 120, thereby improving the support strength of the support member 120 and enabling the support member 120 to provide better support for the electrode assembly 111. Due to the support limiting effect of the support member 120, the pressure relief area 116 and the electrode assembly 111 can be spaced apart, reducing the possibility that the electrode assembly 111 will move toward the pressure relief area 116 and block the pressure relief area 116 when the battery cell 10 experiences thermal runaway. The emissions generated by the battery cell 10 can be discharged in time through the pressure relief area 116, reducing the possibility of significant damage caused by thermal runaway and improving the reliability of the battery cell 10. Meanwhile, one end of the second part 122 of the support member 120 is connected to the first part 121, and the second part 122 is spaced apart from the end of the electrode assembly 111. Each spaced second part 122 can form a first discharge hole 124, which reduces the processing difficulty of the second part 122, makes the support member 120 easy to form, improves the processing convenience of the support member 120, and enables the support member 120 to be mass-produced in the industrial sector, which improves processing efficiency, saves consumables, and reduces the production cost of the battery cell 10.

[0179] Continue to refer to, for example Figures 7 to 9 and combined Figures 15 to 22 As shown, according to some embodiments of this application, optionally, the first discharge hole 124 includes a first sub-discharge hole 1241, the first part 121 has at least one corner area 1211, the second part 122 is positioned to avoid the corner area 1211, and the second parts 122 on the two adjacent sides of the corner area 1211 are spaced apart to form the first sub-discharge hole 1241.

[0180] An edge or corner refers to the connection point formed by the intersection of two adjacent surfaces of the first part 121. An edge or corner can be an edge or a curved transition angle (curved transition angle is also called an R angle). The edge or corner area 1211 refers to the area where the edge or corner is located.

[0181] For example, the first part 121 is generally square in shape, and the adjacent second parts 122 on the adjacent sides avoid the corresponding corner area 1211, so that each corner area 1211 is provided with a first sub-discharge hole 1241 on the side facing the second part 122.

[0182] It should be noted that, except for the corner area 1211, the first discharge hole 124 on the side of the support member 120... Figures 10 to 14As shown, in the non-corner area 1211, a first discharge hole 124 (refer to the second sub-discharge hole 1242) can also be formed between two adjacent second parts 122.

[0183] By providing a first discharge hole 124 in the corner area 1211 of the first part 121, the discharge area can be increased, improving the timeliness of discharge of pollutants when the battery device 100 experiences thermal runaway. Furthermore, when the support member 120 is formed by bending a sheet metal, material accumulation is prone to occur in the corner area 1211, and bending the corner area 1211 is difficult. By providing a first discharge hole 124 in the corner area 1211, the support member 120 can be easily bent using a bending die, improving the ease of forming the support member 120.

[0184] like Figures 7 to 9 and refer to Figures 15 to 18 As shown, according to some embodiments of this application, optionally, the support member 120 includes a first support member 1202, the discharge hole includes a second discharge hole 1213, the first support member 1202 is disposed opposite to the pressure relief area 116, and the second discharge hole 1213 is provided on the first part 121 of the first support member 1202.

[0185] Except for the second discharge hole 1213 provided in the first part 121, the other structures of the first support member 1202 can be the same as the structure of the support member 120 proposed in any of the above embodiments.

[0186] Multiple second discharge holes 1213 can be provided at intervals. The second discharge hole 1213 can be formed by hollowing out the first part 121 of the first support member 1202, and its shape can be elliptical, circular, elongated, etc.

[0187] For example, the first support member 1202 may be generally square in shape, and each of the four sides of the first support member 1202 is provided with a plurality of second parts 122. Among them, two of the second parts 122 of the first support member 1202 opposite to each other along the first direction X are used as first sub-parts 1221, and the first sub-parts 1221 are connected to the first wall 1123 through connecting parts 123. All the second parts 122 of the first support member 1202 opposite to each other along the second direction Y, and the other second parts 122 of the first support member 1202 opposite to each other along the first direction X, are used as second sub-parts 1222, and the second sub-parts 1222 are spaced apart from the first wall 1123. Optionally, the second part 122, which is the first sub-part 1221, is provided in the middle of its corresponding side.

[0188] The first support member 1202 can support the electrode assembly 111 near the pressure relief zone 116, reducing the possibility of the electrode assembly 111 shifting under the influence of emissions during thermal runaway of the battery cell 10. Meanwhile, the first part 121 can be the large surface of the first support member 1202. By providing a second discharge hole 1213 on the first part 121 of the first support member 1202, the timeliness of emission can be improved.

[0189] It should be noted that in some other embodiments, the first part 121 of the first support member 1202 corresponding to the pressure relief zone 116 may not be provided with the second discharge hole 1213. The first support member 1202 communicates with the pressure relief mechanism 115 through the first discharge hole 124 between the second parts 122 on the side and relieves pressure.

[0190] Optionally, the first part 121 of the first support member 1202 includes a support body 1214, which surrounds the second discharge hole 1213; the battery cell 10 also includes an insulating member 130, which is disposed inside the housing 112 and located on the side of the electrode assembly 111 facing the pressure relief area 116. The first part 121 of the first support member 1202 is disposed between the insulating member 130 and the pressure relief area 116. The insulating member 130 has a venting area 136, which is directly opposite to the pressure relief area 116. The venting area 136 includes an insulating body 1361 and a second connecting hole 1362. The insulating body 1361 surrounds the second connecting hole 1362 and covers the support body 1214. The orthogonal projection of the support body 1214 onto the insulating body 1361 is located inside the insulating body 1361.

[0191] For example, the exhaust zone 136 may be the area where the receiving groove 131 provided by the insulating protective member corresponds to the pressure relief zone 116.

[0192] The orthographic projection of the supporting solid portion 1214 onto the insulating solid portion 1361 is located within the insulating solid portion 1361, so that the solid portion of the first support member 1202 can be completely covered by the solid portion of the insulating protective member, thereby reducing the possibility of short circuit between the electrode assembly 111 and the first support member 1202 due to the exposed solid portion of the first support member 1202, and improving the insulation performance and reliability of the battery cell 10.

[0193] Optionally, the receiving groove 131 with the first support member 1202 is a first receiving groove 1314, and the bottom wall of the first receiving groove 1314 is configured as a filter screen structure or a filter screen structure is provided inside the first receiving groove 1314.

[0194] The first receiving groove 1314 is the receiving groove 131 directly opposite the pressure relief area 116.

[0195] When the bottom wall of the first receiving groove 1314 is set as a filter structure, the pores of the filter structure can serve as the second connecting hole 1362.

[0196] In some implementations, the first part 121 of the support body 1203 of the support member 120 can serve as a filter structure, and the pores of the filter structure serve as the second discharge hole 1213.

[0197] In some implementations, a filter structure is provided between the support body 1203 of the support member 120 and the bottom wall of the receiving groove 131.

[0198] The filtration structure can filter out large particles in the emissions, reducing the risk of emissions clogging the pressure relief zone 116, and can also reduce the amount of spark material in the discharged emissions, thereby reducing the possibility of thermal runaway propagation.

[0199] According to some embodiments of this application, optionally, such as Figures 7 to 9 and combined Figures 15 to 22 As shown, the plurality of second parts 122 include a first sub-part 1221 and a second sub-part 1222. The first sub-part 1221 is connected to the first wall 1123 and forms a connecting part 123. The second sub-part 1222 is spaced apart from the first wall 1123.

[0200] That is, the second part 122 connected to the connecting part 123 is the first sub-part 1221. Among the plurality of second parts 122, at least one second part 122 is a second sub-part 1222, and the second sub-part 1222 is spaced apart from the first wall 1123.

[0201] The second sub-part 1222 may be abutted against or spaced apart from any wall of its adjacent outer casing 112.

[0202] The limitation that the second sub-part 1222 is abutted or spaced from the outer casing 112 refers to the limitation when the battery cell 10 is in a normal state. When the battery cell 10 shakes, the spaced second sub-part 1222 may also abut against the outer casing 112.

[0203] For example, such as Figure 7 and Figure 9 As shown, the end of the second sub-part 1222 connected to the first part 121 and the first part 121 are disposed in the receiving groove 131 of the insulating member 130. The end of the second sub-part 1222 away from the first part 121 can abut against the first wall 1123, or the second sub-part 1222 and the first wall 1123 are spaced apart.

[0204] For example, in some embodiments, the furthest position of the second sub-part 1222 away from the first part 121 is set closer to the first part 121 than the position where the first sub-part 1221 is connected to the first wall 1123, so as to reduce the interference of the second sub-part 1222 on the connection operation when the first sub-part 1221 is connected to the first wall 1123 due to its higher setting, and improve the convenience of the connection operation between the first sub-part 1221 and the first wall 1123.

[0205] The insulating component may have at least one first sub-part 1221 and one second sub-part 1222. The first sub-part 1221 is used to connect and fix the outer shell 112 and the support member 120. Based on the first sub-part 1221, the support member 120 is also provided with the second sub-part 1222, which can improve the strength of the support member 120. The second sub-part 1222 may only have the function of support and reinforcement, reducing the number of connection positions between the support member 120 and the outer shell 112. In this way, while improving the support strength of the support member 120, the complexity of the connection operation between the support member 120 and the outer shell 112 can be reduced, and the assembly efficiency of the support member 120 and the outer shell 112 can be improved.

[0206] According to some embodiments of this application, optionally, such as Figures 7 to 9 and combined Figures 15 to 22 As shown, there are at least two first sub-parts 1221, and at least one second sub-part 1222 is provided between two adjacent first sub-parts 1221 along the arrangement direction of the plurality of second sub-parts 122.

[0207] The arrangement direction of the multiple second parts 122 is also the circumferential direction of the first part 121.

[0208] refer to Figures 6 to 9 First sub-parts 1221 are respectively provided on the opposite sides of the first part 121. The opposite sides of the first part 121 are two sides in any direction of the plane in which the first part 121 is located.

[0209] In the same support member 120, there are at least two second parts 122 that serve as first sub-parts 1221 respectively, and a portion of the first sub-parts 1221 are located on one side of the first part 121, while another portion of the first sub-parts 1221 are located on the other side of the first part 121.

[0210] It should be noted that one or more first sub-parts 1221 can be provided on the same side of the first part 121. That is, at least one of the one or more second parts 122 located on the same side of the first part 121 can be used as a first sub-part 1221.

[0211] For example, in some embodiments, at least one support member 120 is a second support member 1201, and the second support member 1201 may have a first sub-part 1221 provided on opposite sides along the width direction (referring to the second direction Y) of the first wall 1123, and the first sub-part 1221 is connected to the first wall 1123.

[0212] For example, in some embodiments, at least one support member 120 is a first support member 1202, and the first support member 1202 may have a first sub-part 1221 on opposite sides along the length direction of the first wall 1123 (refer to the first direction X), and the first sub-part 1221 is connected to the first wall 1123.

[0213] The first sub-part 1221 is connected to the first wall 1123. By providing the first sub-part 1221 on opposite sides of the first part 121, the support member 120 can be fixed from both sides of the first part 121, which improves the reliability and stability of the connection between the support member 120 and the housing 1121, and reduces the impact on the reliability of the battery cell 10 caused by friction debris (e.g., friction debris such as metal wires or metal fragments generated by the movement of the support member 120 relative to the housing 1121).

[0214] A connecting portion 123 is provided at one end of the first sub-part 1221 away from the first part 121. The connecting portion 123 extends along the extending direction of the first wall 1123, and the first sub-part 1221 is connected to the first wall 1123 through the connecting portion 123. The extending direction of the first wall 1123 refers to the extending direction of the plane in which the first wall 1123 is located, that is, any direction perpendicular to the arrangement direction of the electrode assembly 111 and the first wall 1123 (this arrangement direction can be referred to as the third direction Z). The connecting portion 123 extends along the extending direction of the first wall 1123, which can be roughly understood as the connecting portion 123 extending from the end connected to the first sub-part 1221 in a direction parallel to the first wall 1123.

[0215] The first sub-part 1221 and the connecting part 123 can be connected as one unit by means of welding, bonding, or integral molding. For example, the connecting part 123 can be a pin formed by bending the first sub-part 1221.

[0216] For example, the middle of the connecting portion 123 can be connected to one end of the first sub-part 1221 away from the first part 121. Along the direction parallel to the first wall 1123, both ends of the connecting portion 123 protrude from the first sub-part 1221 and extend in the direction away from the first sub-part 1221 respectively (this implementation is not shown in the figure).

[0217] For example, such as Figures 7 to 9 , Figures 15 to 22As shown, along a direction parallel to the first wall 1123, one end of the connecting portion 123 can be connected to the first sub-part 1221, and the other end of the connecting portion 123 extends along the extending direction of the first wall 1123. The end of the connecting portion 123 facing away from the first sub-part 1221 can be located on the side of the first sub-part 1221 facing away from the first part 121. It should be noted that in some embodiments, along a direction parallel to the first wall 1123, the end of the connecting portion 123 facing away from the first sub-part 1221 can also be located on the side of the first sub-part 1221 facing the first part 121 (this implementation is not shown in the figures). In the configuration where one end of the connecting portion 123 is connected to the first sub-part 1221 and the other end extends away from the first sub-part 1221, the connecting portion 123 can be formed by bending the first sub-part 1221, which is relatively convenient for processing.

[0218] By providing the connecting part 123, the ease of connecting the first sub-part 1221 and the first wall 1123 is improved.

[0219] like Figure 9 , Figure 15 ,and Figure 21 As shown, exemplarily, along a direction parallel to the first wall 1123, one end of the connecting portion 123 can be connected to the first sub-portion 1221, and the other end of the connecting portion 123 extends along the extending direction of the first wall 1123 and protrudes from the first sub-portion 1221. The end of the connecting portion 123 away from the first sub-portion 1221 has a chamfered C-angle as a chamfer 1231. Specifically, along the arrangement direction of the electrode assembly 111 and the first wall 1123 (referring to the third direction Z), the chamfer 1231 can be provided on the side of the connecting portion 123 facing away from the first wall 1123. By providing the chamfer 1231, the ease of assembly and connection between the connecting portion 123 and the first wall 1123 can be improved. For example, during the welding process between the connecting portion 123 and the first wall 1123, the chamfer 1231 can easily penetrate the weld, improving welding reliability.

[0220] For example, when the same support member 120 is provided with multiple first sub-parts 1221, one or more second sub-parts 1222 can be provided between any adjacent first sub-parts 1221 along the arrangement direction of the multiple second sub-parts 122.

[0221] For example, the number of second sub-parts 1222 of the same support member 120 is equal to or greater than the number of first sub-parts 1221.

[0222] The second sub-part 1222 is provided between adjacent first sub-parts 1221 of the support member 120, which can improve the strength of the support member 120. The second sub-part 1222 can only have the function of support and reinforcement, reducing the number of connection points between the support member 120 and the outer shell 112. In this way, while improving the support strength of the support member 120, the complexity of the connection operation between the support member 120 and the outer shell 112 can be reduced, and the assembly efficiency of the support member 120 and the outer shell 112 can be improved.

[0223] According to some embodiments of this application, optionally, the insulating member 130 includes a boss portion 132 protruding toward the electrode assembly 111, and a receiving groove 131 and a receiving groove 135 are disposed on the boss portion 132.

[0224] refer to Figures 7 to 14 As shown, the insulating member 130 is provided with the receiving groove 131 and the receiving groove 135 in a position that can protrude toward the electrode assembly 111 relative to other positions. That is, the insulating member 130 has a boss portion 132 protruding on the side facing the electrode assembly 111.

[0225] The receiving groove 131 and the receiving groove 135 can be configured as bosses 132 with the same degree of protrusion, or they can be configured as bosses 132 with different degrees of protrusion. The bosses 132 corresponding to the receiving groove 131 and the receiving groove 135 can be connected as one piece.

[0226] For example, such as Figures 7 to 14 As shown, the first receiving groove 1314 corresponding to the pressure relief area 116 and used to accommodate the first support member 1202 has a different degree of protrusion than the receiving groove 135 located on both sides of the first receiving groove 1314 along the first direction X. The boss portion 132 forms a step. The boss portion 132 in the area corresponding to the first receiving groove 1314 is more protruding than the boss portion 132 in the area corresponding to the receiving groove 135. Accordingly, the depth of the first receiving groove 1314 is greater than the depth of the receiving groove 135.

[0227] For example, such as Figures 7 to 14 As shown, the second receiving groove 1315, which avoids the pressure relief area 116 and is used to accommodate the second support member 1201, has the same degree of protrusion as the receiving groove 135 located on both sides of the second receiving groove 1315 along the second direction Y. The depth of the second receiving groove 1315 is approximately the same as the depth of the receiving groove 135.

[0228] The boss portion 132 protrudes towards the electrode assembly 111, and the boss portion 132 can abut against the end face of the electrode assembly 111 facing the first wall 1123. In this way, a gap for assembling the tab 113 can be formed between the two boss portions 132 and between the first wall 1123 and the end face of the electrode assembly 111, reducing the possibility of interference between the tab 113 and the insulating member 130. At the same time, a support member 120 is provided at the position of the boss portion 132 through the receiving groove 131, which can make reasonable use of the space of the structure.

[0229] According to some embodiments of this application, optionally, the melting point of the support member 120 is greater than the melting point of the insulating member 130, and / or, the rigidity of the support member 120 is greater than the rigidity of the insulating member 130; and / or, the support member 120 is a rigid member; and / or, the insulating member 130 is an elastic soft member; and / or, the support member 120 is a metal member.

[0230] For example, the melting point of the support member 120 is greater than that of the insulator 130. In the event of thermal runaway of the battery cell 10 and melting of the insulator 130, the higher melting point of the support member 120 reduces the likelihood of the support member 120 melting. The support member 120 can provide better support for the electrode assembly 111, reducing the possibility of the electrode assembly 111 shifting under the influence of emissions.

[0231] The melting points of the support 120 and the insulation 130 can be obtained from a known table of melting points of existing materials, or they can be verified through testing. Specifically, a sample of the support 120 and the insulation 130 can be obtained, and then a heating test can be performed on the sample to test the melting points of the two.

[0232] Optionally, the rigidity of the support member 120 is greater than that of the insulator 130. In this way, the support member 120 can have higher support strength than the insulator 130. This not only enhances the support of the support member 120 for the electrode assembly 111 under thermal runaway conditions, but also provides a certain support for the insulator 130 when the battery cell 10 is in normal use, reducing the possibility of excessive deformation of the insulator 130.

[0233] Generally, the greater the rigidity, the better the strength. The rigidity of the support 120 and the rigidity of the insulation 130 can be obtained from known tables of rigidity or strength of existing materials, or it can be verified by experimental testing. Specific tests can be static loading tests, for example, using a universal testing machine to apply the same load to two objects and measure their deformation. The object with greater rigidity will deform less under the same load.

[0234] For example, the support member 120 can be a rigid structural member made of a hard material, and the insulating protective member can be an elastic structural member made of a soft elastic material.

[0235] Optionally, the support member 120 is a rigid member. A rigid member is an object whose shape and size hardly change when subjected to force, and the rigidity of a rigid member is greater than that of an elastic soft member.

[0236] For example, the support member 120 can be a metal part such as aluminum, aluminum alloy, or steel, or a rigid part such as ceramic. The support member 120 is a rigid part, which has high support strength and high temperature resistance, improves the support of the support member 120 for the electrode assembly 111, and reduces the possibility that the support member 120 will melt when the battery cell 10 experiences thermal runaway.

[0237] For example, the insulating component 130 is an elastic soft component. An elastic soft component refers to a material or object that can undergo significant deformation when subjected to external force and can return to a near-original shape after the external force is removed. Such materials typically possess good elasticity, flexibility, and a certain degree of deformability. Specifically, an elastic soft component can be a plastic component, rubber component, or other plastic component with insulating properties.

[0238] For example, the insulating component 130 is a plastic component. Plastic components are easy to process, have high insulation properties, and have good elastic cushioning performance, which improves the protective performance of the insulating component 130 on the electrode assembly 111.

[0239] The insulating component 130 is configured as an elastic soft component, which has good elastic buffering performance and improves the protective performance of the insulating component 130 on the electrode assembly 111.

[0240] According to some embodiments of this application, optionally, the support member 120 is an integrally formed structure, and / or, the side of the first part 121 facing the electrode assembly 111 is connected to a heat-resistant insulating structure.

[0241] Optionally, the support member 120 is a one-piece molded structure, that is, the first part 121 and the plurality of second parts 122 are a one-piece molded structure. For example, the support member 120 can be formed into a one-piece molded structure by processes such as bending, casting, and machining.

[0242] It should be noted that a unibody structure can be understood as an integral structure that integrates multiple components or functions using a single material, and the components usually do not need to be assembled or connected.

[0243] Optionally, the first part 121 is connected to a heat-resistant insulating structure on the side facing the electrode assembly 111. The heat-resistant insulating structure refers to a structure that is not easily melted by high-temperature emissions when the battery cell 10 experiences thermal runaway and has an electrical isolation function.

[0244] For example, the heat-resistant insulation structure can be a high-temperature resistant adhesive paper, such as PI adhesive (polyimide adhesive), which can be applied to the first part 121.

[0245] When a single battery cell 10 experiences thermal runaway, the temperature of its emissions can be obtained through testing, and the heat-resistant insulating material can be rationally selected based on the temperature of the emissions obtained from the test.

[0246] When the battery cell 10 experiences thermal runaway, the high-temperature resistant insulation structure is not easily melted. This not only reduces the possibility of the support member 120 being damaged by emissions and improves the support of the support member 120 for the electrode assembly 111, but also allows the high-temperature resistant insulation structure to remain between the support member 120 and the electrode assembly 111 after the insulation support member 120 melts, thus providing insulation and reducing the possibility of a short circuit between the support member 120 and the electrode assembly 111 and mitigating the hazards caused by thermal runaway.

[0247] like Figures 5 to 20As shown, this embodiment proposes a battery cell 10, including a housing 112, an electrode assembly 111, a support member 120, and an insulating member 130. The end cap 1122 of the housing 112 is provided with a pressure relief area 116, and a pressure relief mechanism 115 is provided in the pressure relief area 116. The electrode assembly 111 is disposed within the housing 112, and a tab 113 is provided on the electrode assembly 111 facing the end cap 1122. An electrode terminal 114 is also provided on the end cap 1122, and the electrode terminal 114 is connected to the tab 113. The insulating member 130 is disposed within the housing 112 and located on the side of the electrode assembly 111 facing the pressure relief area 116. The support member 120 is disposed between the insulating member 130 and the end cap 1122. The support member 120 includes a second support member 1201 and a first support member 1202. Both the second support member 1201 and the first support member 1202 are disposed between the insulating member 130 and the end cap 1122. The second support member 1201 and the first support member 1202 each include a first part 121 and at least two second parts 122. The first part 121 is disposed between the electrode assembly 111 and the pressure relief area 116. One end of each of the at least two second parts 122 is connected to the first part 121, and the other ends of the at least two second parts 122 extend away from the electrode assembly 111 and are spaced apart. The second support member 1201 and the first support member 1202 can be made of the same material, specifically aluminum alloy. The insulating member 130 can be made of plastic. The melting point of the second support member 1201 and the melting point of the first support member 1202 are both greater than the melting point of the insulating member 130. The rigidity of the second support member 1201 and the rigidity of the first support member 1202 are both greater than the rigidity of the insulating member 130. The second support member 1201 has a plurality of second parts 122 arranged circumferentially around its own first part 121 and respectively connected to the circumferential edge of the first part 121; the first support member 1202 has a plurality of second parts 122 arranged circumferentially around its own first part 121 and respectively connected to the circumferential edge of the first part 121; two second parts 122 of the second support member 1201 that are opposite each other along the second direction Y serve as the first sub-parts 1221 of the second support member 1201, and two second parts 122 of the first support member 1202 that are opposite each other along the first direction X serve as the first sub-parts 1221 of the first support member 1202, and the end of each first sub-part 1221 facing away from the first part 121 is welded to the end cap 1122 through the connecting part 123 (specifically welded to the inner wall surface of the end cap 1122 facing the electrode assembly 111). The plurality of second portions 122 of the second support member 1201 and the other second portions 122 of the plurality of second portions 122 of the first support member 1202 serve as second sub-portions 1222, and the second sub-portions 1222 are spaced apart from the end cap 1122.In one support member 120, each first sub-part 1221 is connected to one end of a corresponding connecting part 123. The other end of the connecting part 123 extends in a direction away from the first part 121. The connecting part 123 is arranged approximately parallel to the end cap 1122, and the edge of the connecting part 123 away from the first part 121 is provided with a chamfer 1231 to facilitate penetration welding. The first part 121, multiple second parts 122, and connecting part 123 of the second support member 1201 are integrally formed. The first part 121, multiple second parts 122, and connecting part 123 of the first support member 1202 are also integrally formed. In this configuration, a first discharge hole 124 is formed between a plurality of second parts 122 of the second support member 1201, and a first discharge hole 124 is also formed between a plurality of second parts 122 of the first support member 1202. Each first part 121 has at least one corner area 1211. The second part 122 is positioned to avoid the corner area 1211. The second parts 122 on the two adjacent sides of the corner area 1211 are spaced apart to form a first sub-discharge hole 1241. The insulating member 130 has three protrusions 132 on the side facing the electrode assembly 111. Two of the protrusions 132 are located at both ends of the first wall 1123 along the first direction X, and the third protrusion 132 is located in the middle of the first wall 1123 and is directly opposite the pressure relief area 116. The insulating member 130 has receiving grooves 131 opening towards the first wall 1123 corresponding to each protrusion 132. A second support member 1201 is provided in each of the receiving grooves 131 at both ends, and a first support member 1202 is provided in the middle receiving groove 131. The groove wall of the receiving groove 131 of the insulating member 130 may be provided with a first connecting hole 1311. The first connecting hole 1311 communicates with the first discharge hole 124 of the support member 120 in the receiving groove 131 to improve the smoothness of discharge. The insulating component 130 is provided with a receiving groove 135. The connecting part 123 is provided in a one-to-one correspondence with the receiving groove 135. The opening of the receiving groove 135 is provided facing the connecting part 123. Along the arrangement direction from the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), the projection of the connecting part 123 on the electrode assembly 111 falls within the projection of the receiving groove 135 on the electrode assembly 111. The groove wall of the receiving groove 135 facing the second part 122 is the first groove wall 1351. The end of the first groove wall 1351 facing the groove opening is provided with a first notch 1352. The connecting part 123 passes through the first notch 1352 and is located in the receiving groove 135. Along the arrangement direction of the first wall 1123 to the electrode assembly 111 (referring to the third direction Z), the projection of the second support member 1201 onto the first wall 1123 is spaced apart from the pressure relief area 116. The insulating member 130 is connected to the end cap 1122 via the connector 133. A second notch 1212 is provided on the first part 121 of the second support member 1201, and the connector 133 passes through the second notch 1212.The first part 121 of the first support member 1202 includes a support body 1214, which surrounds the second discharge hole 1213. The battery cell 10 also includes an insulating member 130, which is disposed inside the housing 112 and located on the side of the electrode assembly 111 facing the pressure relief area 116. The first part 121 of the first support member 1202 is disposed between the insulating member 130 and the pressure relief area 116. The insulating member 130 has a venting area 136, which is directly opposite to the pressure relief area 116. The venting area 136 includes an insulating body 1361 and a second connecting hole 1362. The insulating body 1361 surrounds the second connecting hole 1362 and covers the support body 1214. The orthogonal projection of the support body 1214 onto the insulating body 1361 is located inside the insulating body 1361. Each first part 121 has a PI high-temperature resistant adhesive paper on the side facing the electrode assembly 111 as a heat-resistant insulation structure.

[0248] This application also proposes a battery device 100, which includes a plurality of battery cells 10 as proposed in this application or any embodiment of this application.

[0249] The battery device 100 of this embodiment has the same beneficial effects as the battery cell 10 proposed in this application or any embodiment of this application.

[0250] This application also proposes an energy storage device, including a plurality of battery cells 10 or battery devices 100 as proposed in this application or any embodiment of this application, wherein the battery cells 10 or battery devices 100 are used to store electrical energy or provide electrical energy.

[0251] The energy storage device of this embodiment has the same beneficial effects as the battery cell 10 proposed in this application or any embodiment of this application.

[0252] This application also proposes an energy storage system 2000, including a power conversion device and an energy storage device proposed in this application or any embodiment of this application. The power conversion device is used to electrically connect the power generation device 3000 and the energy storage device.

[0253] The energy storage system 2000 of this embodiment has the same beneficial effects as the battery cell 10 proposed in this application or any embodiment of this application.

[0254] This application also proposes a charging network 1000, including a charging pile 300 and an energy storage device or energy storage system 2000 proposed in this application or any embodiment of this application, wherein the energy storage device is used to provide power to the charging pile 300.

[0255] The charging network 1000 of this embodiment has the same beneficial effects as the battery cell 10 proposed in this application or any embodiment of this application.

[0256] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments, and their similarities or similarities can be referred to each other. For the sake of brevity, these will not be repeated here.

[0257] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing has a first wall and a receiving cavity; Electrode assembly is disposed in the receiving cavity; An insulating element is disposed between the first wall and the electrode assembly, the insulating element having a receiving portion; A support member is disposed between the insulating member and the first wall. The support member has a connecting portion that is connected to the first wall. Along the arrangement direction from the first wall to the electrode assembly, at least a portion of the projection of the connecting portion on the electrode assembly falls within the projection of the receiving portion on the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The receiving part is provided with a receiving groove, the opening of the receiving groove is disposed facing the connecting part, and along the arrangement direction of the first wall to the electrode assembly, at least a portion of the projection of the connecting part on the electrode assembly falls into the projection of the receiving groove on the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The side of the connecting portion away from the electrode assembly contacts and connects with the side of the first wall facing the electrode assembly to form a connecting area. Along the arrangement direction from the first wall to the electrode assembly, the projection of the connecting area on the electrode assembly falls into the projection of the receiving groove on the electrode assembly.

4. The battery cell according to claim 1, characterized in that, The insulating member has a receiving groove on the side facing the first wall, and the support member is at least partially received in the receiving groove.

5. The battery cell according to claim 4, characterized in that, Along the arrangement direction of the first wall and the insulating member, the bottom wall of the receiving groove is spaced apart from the supporting member.

6. The battery cell according to claim 4, characterized in that, Along the direction intersecting the first wall and the arrangement direction of the insulating element, the receiving portion is disposed on one side of the receiving groove. The supporting element includes a supporting body disposed in the receiving groove. The connecting portion is connected to one end of the supporting body facing the first wall. Along the direction intersecting the first wall and the arrangement direction of the insulating element, one end of the connecting portion is connected to the supporting body, and the other end of the connecting portion extends in the receiving portion in a direction away from the supporting body.

7. The battery cell according to claim 6, characterized in that, The receiving part is provided with a receiving groove, the opening of the receiving groove is facing the first wall, a first groove wall is provided between the receiving groove and the receiving groove, the first groove wall is spaced apart from the first wall to form a first notch, the first notch connects the receiving groove and the receiving groove, and the connecting part passes through the first notch.

8. The battery cell according to claim 7, characterized in that, Along the arrangement direction of the first wall and the insulating element, the size of the first notch is h1 and the size of the connecting portion is h2, wherein h1 > h2.

9. The battery cell according to claim 7, characterized in that, The first groove wall protrudes from the bottom wall of the receiving groove.

10. The battery cell according to claim 6, characterized in that, The first wall is provided with a pressure relief area, the accommodating groove is provided with a connecting hole, the supporting body is provided with a discharge hole, and the discharge hole connects the connecting hole and the pressure relief area.

11. The battery cell according to claim 10, characterized in that, The discharge hole includes a first discharge hole. The support body includes a first part and a plurality of second parts. The first part and the plurality of second parts are all located in the receiving groove. One end of each of the plurality of second parts is connected to the first part. The other end of each of the plurality of second parts extends toward the first wall. At least one of the second parts is connected to the connecting part at one end toward the first wall. The plurality of second parts are connected to the circumferential edge of the first part and are spaced apart along the circumferential edge of the first part. The first discharge hole is located between two adjacent second parts.

12. The battery cell according to claim 11, characterized in that, The first discharge hole includes a first sub-discharge hole. The first part has at least one corner area. The second part is positioned to avoid the corner area. The second parts on the two sides adjacent to the corner area are spaced apart to form the first sub-discharge hole.

13. The battery cell according to claim 11, characterized in that, The support includes a first support, and the discharge hole includes a second discharge hole. The first support is disposed opposite to the pressure relief zone, and the second discharge hole is provided on the first part of the first support.

14. The battery cell according to claim 11, characterized in that, The plurality of second parts include a first sub-part and a second sub-part, the first sub-part being connected to the first wall and forming the connecting portion, and the second sub-part being spaced apart from the first wall.

15. The battery cell according to claim 14, characterized in that, The first sub-part is configured to be at least two, and at least one second sub-part is provided between two adjacent first sub-parts along the arrangement direction of the plurality of second parts.

16. The battery cell according to claim 7, characterized in that, The insulating member includes a boss portion protruding toward the electrode assembly, and the receiving groove and the receiving groove are disposed on the boss portion.

17. The battery cell according to any one of claims 1-16, characterized in that, The melting point of the support member is greater than that of the insulating member; And / or, the rigidity of the support member is greater than the rigidity of the insulating member; And / or, the support member is a rigid member; And / or, the insulating element is an elastic, soft element; And / or, the support member is a metal part.

18. The battery cell according to any one of claims 1-16, characterized in that, The connecting part is welded to the first wall; And / or, the side of the support member opposite to the first wall is connected to a heat-resistant insulating structure.

19. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-18.

20. An energy storage device, characterized in that, It includes a plurality of battery cells according to any one of claims 1-18 or a plurality of battery devices according to claim 19, wherein the battery cells or the battery devices are used to store electrical energy or provide electrical energy.

21. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 20, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

22. A charging network, characterized in that, include: Charging stations; The energy storage device as described in claim 20 or the energy storage system as described in claim 21, wherein the energy storage device is used to provide electrical energy to the charging pile.

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