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

Abstract

The present application relates to a battery cell, a battery apparatus, an energy storage apparatus, an energy storage system, and a charging network. The battery cell comprises a casing, an electrode assembly, and an insulating structure. The electrode assembly is accommodated in the casing, and the casing comprises a first casing wall and protruding portions protruding towards the electrode assembly and supporting the electrode assembly, wherein the protruding portions form recessed portions on the surface of the first casing wall facing away from the electrode assembly. The insulating structure comprises a first insulating member, the first insulating member covers the surface of the first casing wall facing away from the electrode assembly, and a part of the first insulating member is attached to the inner walls of the recessed portions. In the battery cell, a first insulating member covers the surface of a first casing wall facing away from an electrode assembly, so that the bottom of the battery cell is insulatively protected. Since a part of the first insulating member is attached to inner walls of recessed portions, the first insulating member is tightly attached to the recessed portions of the first casing wall, so that no gap is generated between the first insulating member and the inner walls of the recessed portions, thereby effectively improving the insulation performance of the bottom of the battery cell and prolonging the service life of insulating materials.

Description

Battery cells, battery packs, energy storage devices, energy storage systems and charging networks Related applications

[0001] This application claims priority to Chinese patent application filed on December 25, 2024, application number 2024119230920, entitled "Battery cell, battery device, energy storage device, energy storage system and charging network", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to battery cells, battery devices, energy storage devices, energy storage systems and charging networks. Background Technology

[0003] With the rapid development of battery technology, the reliability requirements for individual battery cells are becoming increasingly stringent. To effectively prevent explosions at the bottom of the battery cell, a portion of the bottom of the casing is typically recessed to form an inward-facing protrusion, elevating the electrode components inside the battery cell. However, due to limitations in battery structure design, this can easily reduce the insulation performance and lifespan of the insulation material at the bottom of the battery cell. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery cell, battery device, energy storage device, energy storage system, and charging network to effectively improve the insulation performance of the bottom of the battery cell and the lifespan of the insulation material.

[0005] In a first aspect, this application provides a battery cell, the battery cell comprising: a housing, which includes a first housing wall and a protrusion; an electrode assembly housed within the housing, the protrusion being formed on the surface of the first housing wall facing the electrode assembly, and the protrusion forming a recess on the surface of the first housing wall facing away from the electrode assembly; and an insulating structure including a first insulating member, the first insulating member covering the surface of the first housing wall facing away from the electrode assembly, and a portion of the first insulating member being attached to the inner wall of the recess.

[0006] In the aforementioned battery cell, the first insulating member covers the surface of the first housing wall facing away from the electrode assembly, thus insulating and protecting the bottom of the battery cell. Since a portion of the first insulating member is attached to the inner wall of the recess, the first insulating member fits tightly against the recess of the first housing wall, preventing gaps between the first insulating member and the inner wall of the recess. This reduces the possibility of partial discharge at the recess, effectively improving the insulation performance of the bottom of the battery cell and the lifespan of the insulating material.

[0007] In some embodiments, the first insulating member includes a bonding portion and a peripheral portion located around the outer periphery of the bonding portion. The bonding portion is bonded to the inner wall of the recess, and the peripheral portion is bonded to the area of ​​the first housing wall excluding the recess. This design, with the first insulating member comprising a bonding portion and a peripheral portion, allows the first insulating member to better adhere to the surface of the first housing wall facing away from the electrode assembly. This not only improves the bonding strength between the first insulating member and the first housing wall but also enhances the insulation protection of the first housing wall, thereby improving the insulation performance of the battery cell and the service life of the insulating material.

[0008] In some embodiments, the bonding portion adheres to the inner wall of the recess, and a groove is formed on one side of the bonding portion facing away from the recess. This design, with the groove on the side of the bonding portion facing away from the recess, facilitates increasing the specific surface area of ​​the first insulating member, improving the adhesion strength of the surface of the first insulating member, and thus enhancing the stability of the battery cell in the battery device.

[0009] In some embodiments, the inner wall of the recess includes a first wall and second walls respectively disposed on opposite sides of the first wall, and the fitting portion includes a first sub-part and second sub-parts respectively disposed on opposite sides of the first sub-part. The two second sub-parts and the first sub-part surround to form a groove, the first sub-part fitting to the first wall, and the second sub-part fitting to the second wall. This design, with the recess consisting of a first wall and two second walls, and the fitting portion consisting of a first sub-part and two second sub-parts, facilitates the formation of a groove on the side of the fitting portion facing away from the recess when it is fitted into the recess.

[0010] In some embodiments, the first insulating member includes a covering portion, and the housing further includes a second housing wall surrounding the outer periphery of the first housing wall, wherein the covering portion is configured to cover at least a portion of the second housing wall. This design extends the covering portion of the first insulating member to cover the second housing wall, improving the insulation protection effect of the first insulating member on the first housing wall; simultaneously, it also reduces creepage discharge phenomena on the second housing wall during insulation testing of the first housing wall.

[0011] In some embodiments, both the mating portion and the recess include multiple portions, and are arranged one-to-one, with the peripheral portion located on the outer periphery of each mating portion. This design, by introducing multiple mating portions and recesses, further improves the bonding strength between the first insulating member and the first shell wall, thereby achieving more effective insulation protection for the first shell wall.

[0012] In some embodiments, the thickness of the first insulating member is denoted as h, where 50mm ≤ h ≤ 300mm. This design controls the thickness of the first insulating member between 50mm and 300mm, reducing space occupation in the height direction while maximizing insulation protection of the first shell wall and improving the insulation performance of the battery cell.

[0013] In some embodiments, the thickness h also satisfies the condition that 60mm ≤ h ≤ 80mm. This design controls the thickness of the first insulating element between 60mm and 80mm, further effectively balancing space occupancy in the height direction and the insulation performance of the battery cell.

[0014] In some embodiments, the insulation structure further includes a second insulating element, which covers the side of the housing surrounding the outer periphery of the first housing wall and is connected to the first insulating element. This design, by introducing the second insulating element, makes the insulation protection of the housing more effective and reliable, further improving the insulation performance of the battery cell.

[0015] In some embodiments, a portion of the first insulating member covers the side of the housing surrounding the outer periphery of the first housing wall, and one end of the second insulating member near the first housing wall covers the surface of the second insulating member facing away from the housing. This design, which overlaps the second insulating member and the first insulating member on the side of the housing, not only facilitates their interconnection but also improves the insulation protection of the housing and enhances the insulation effect.

[0016] In some embodiments, the second insulating member is configured to be attached to the side of the housing surrounding the outer periphery of the first housing wall by means of a film layer bonding method. This design, which attaches the second insulating member to the side of the housing by means of a film layer bonding method, not only simplifies the process, but also improves the insulation protection of the side of the housing.

[0017] In some embodiments, the first insulating member is configured to have a structure of one or more of epoxy material, polyimide material, and acrylic material. This design, using at least one of epoxy material, polyimide material, and acrylic material as the material of the first insulating member, not only improves insulation performance but also facilitates the first insulating member's fit against the inner wall of the recess, eliminating gaps between the first insulating member and the recess and reducing the risk of partial discharge.

[0018] In some embodiments, the housing includes a shell and an end cap disposed on the shell, with the end of the shell remote from the end cap including a first shell wall. This design, with the end cap and shell, facilitates the enclosure of the electrode assembly, providing it with a sealed environment.

[0019] In some embodiments, the first insulating element is formed by coating or electrophoresis on the inner wall of the recess and the surface of the first housing wall facing away from the electrode assembly. This design, using coating or electrophoresis, helps to improve the insulation performance of the first housing wall; at the same time, it also reduces the possibility of gaps between the first insulating element and the recess, thus reducing the probability of partial discharge.

[0020] In some embodiments, the battery cell further includes a pressure relief mechanism disposed on the first housing wall. This design, with both the pressure relief mechanism and the protrusion located on the first bottom wall, ensures stable pressure relief within the pressure relief mechanism, thereby improving the reliability of the battery cell.

[0021] In some embodiments, the pressure relief mechanism includes a grooved portion recessed into the surface of the first housing wall facing and / or away from the electrode assembly. This design, by introducing the grooved portion, facilitates directional pressure relief from the first housing wall in the event of thermal runaway, thereby improving the reliability of the battery cell.

[0022] Secondly, this application provides a battery device, which includes any of the above-mentioned battery cells.

[0023] Thirdly, this application provides an electrical device that includes the battery device described above.

[0024] Fourthly, this application provides an energy storage device, which includes the battery device described above.

[0025] Fifthly, this application provides an energy storage system, which includes a power conversion device and an energy storage device as described above, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0026] Sixthly, this application provides a charging network, which includes: charging piles; and energy storage devices or energy storage systems as described above, wherein the energy storage devices are used to provide electrical energy to the charging piles. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0028] Figure 1 is an exploded view of a battery device provided in some embodiments of this application.

[0029] Figure 2 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of this application.

[0030] Figure 3 is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application.

[0031] Figure 4 is a schematic diagram of the structure of a charging network provided in some embodiments of this application.

[0032] Figure 5 is a cross-sectional view of a partial structure after the outer shell and the insulating structure are assembled, according to some embodiments of this application.

[0033] Figure 6 is a cross-sectional view of a partial structure of the housing provided in some embodiments of this application.

[0034] Figure 7 is a schematic diagram of the surface structure of the first shell wall back electrode assembly provided in some embodiments of this application.

[0035] Figure 8 is a cross-sectional view of a partial structure after the outer shell and the insulating structure are assembled, according to some other embodiments of this application.

[0036] Figure 9 is an enlarged view of the structure at circle A in Figure 6.

[0037] Figure 10 is an enlarged view of the structure at circle B in Figure 5.

[0038] 100. Battery assembly; 10. Battery cell; 20. Housing; 201. First part; 202. Second part; 1. Outer shell; 1a. Housing; 1a1. Opening; 1b. End cap; 11. First shell wall; 12. Protrusion; 13. Recess; 131. First wall; 132. Second wall; 14. Second shell wall; 2. Electrode assembly; 3. Insulation structure; 31. First insulating element; 311. Adhesive part; 31a. First sub-part; 31b. Second sub-part; 312. Peripheral part; 313. Covering part; 314. Groove; 32. Second insulating element; 4. Pressure relief mechanism; 41. Score; X. Height direction; 200. Energy storage device; 300. Power conversion device; 400. Power generation device; 500. Charging pile; 600. Connector. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0046] Battery devices generally consist of a casing and individual battery cells housed within it. To improve the reliability of the individual battery cells, they typically include a pressure relief mechanism. Taking bottom-explosion-proof design as an example, a portion of the bottom of the casing is recessed to form an inward-facing protrusion. This protrusion supports the electrode assembly, elevating it and creating a pressure relief channel between the electrode assembly and the bottom of the individual battery cell, thus achieving effective explosion protection. However, when an insulating blue film wraps around the battery cell, the protrusion forms a recess on the outer surface of the cell's bottom. This creates a gap at the recess, causing voltage to be applied at the gap during battery cell operation. Under this voltage, partial discharge occurs at the gap. The charged particle impacts generated by this partial discharge raise the local temperature, leading to overheating and even carbonization of the insulating blue film, resulting in loss of insulation. Simultaneously, compounds such as ozone and nitrogen oxides generated by partial discharge corrode the insulating material, shortening its lifespan.

[0047] Based on this, and addressing the issues of reduced insulation performance and lifespan of insulating materials at the bottom of traditional battery cells, this application provides a battery cell in which a first insulating member covers the surface of the first shell wall facing away from the electrode assembly, thereby providing insulation protection for the bottom of the battery cell. Since a portion of the first insulating member is attached to the inner wall of the recess, the first insulating member is tightly fitted to the recess of the first shell wall, preventing gaps between the first insulating member and the inner wall of the recess. This reduces the possibility of partial discharge at the recess and effectively improves the insulation performance and lifespan of the insulating material at the bottom of the battery cell.

[0048] Furthermore, by attaching a portion of the first insulating member to the recess, the bonding area of ​​the first insulating member on the outer surface of the first shell wall is increased, which helps to improve the bonding strength between the first insulating member and the shell, and improves the structural stability of the battery cell. At the same time, it also facilitates meeting the bonding strength requirements of the battery cell in the battery assembly.

[0049] The battery cells disclosed in this application can be used, but are not limited to, energy storage systems, and can also be used in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and battery devices disclosed in this application.

[0050] The batteries disclosed in this application can be used, but are not limited to, energy storage systems, and can also be used in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and intermediate batteries disclosed in this application can be used to construct such electrical devices. Please refer to Figure 1, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, with the battery cells 10 housed within the housing 20. The housing 20 provides a space for housing the battery cells 10, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first portion 201 and a second portion 202, which overlap each other, and together define a space for housing the battery cells 10. The second part 202 can be a hollow structure with one open end 1a1, and the first part 201 can be a plate-like structure. The first part 201 covers the open side of the second part 202 so that the first part 201 and the second part 202 together define the accommodating space. Alternatively, the first part 201 and the second part 202 can both be hollow structures with one open end 1a1, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box 20 formed by the first part 201 and the second part 202 can be of various shapes, such as a cylinder, a cuboid, etc.

[0051] In the battery device 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0052] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0053] Please refer to Figure 2, which is an exploded structural diagram of a battery cell 10 provided in some embodiments of this application. A battery cell 10 refers to the smallest unit constituting a battery device 100. As shown in Figure 3, the battery cell 10 includes an end cap 1b, a housing 1a, an electrode assembly 2, and other functional components.

[0054] End cap 1b refers to a component that covers the opening 1a1 of housing 1a to isolate the internal environment of battery cell 10 from the external environment. The shape of end cap 1b can be adapted to the shape of housing 1a to fit it. End cap 1b can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 1b is not easily deformed under pressure and impact, enabling battery cell 10 to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 1b. Electrode terminals can be used for electrical connection with electrode assembly 2 to output or input electrical energy to battery cell 10. In some embodiments, end cap 1b can also be provided with a pressure relief mechanism 4 for releasing internal pressure when the internal pressure or temperature of battery cell 10 reaches a threshold. The material of end cap 1b can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 1b. The insulating element can be used to isolate the electrical connection components within the housing 1a from the end cap 1b to reduce the risk of short circuits. Exemplarily, the insulating element may be made of plastic, rubber, etc.

[0055] The housing 1a is a component used to cooperate with the end cap 1b to form the internal environment of the battery cell 10. This internal environment can accommodate the electrode assembly 2, electrolyte, and other components. The housing 1a and end cap 1b can be independent components. An opening 1a1 can be provided on the housing 1a, and the end cap 1b can be used to close the opening 1a1 to form the internal environment of the battery cell 10. Alternatively, the end cap 1b and housing 1a can be integrated. Specifically, the end cap 1b and housing 1a can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 1a, the end cap 1b closes the housing 1a. The housing 1a can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 1a can be determined according to the specific shape and size of the electrode assembly 2. The material of the housing 1a can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic. This embodiment does not impose any special limitations on this.

[0056] Electrode assembly 2 is the component in the battery cell 10 where the electrochemical reaction occurs. The casing 1a may contain one or more electrode assemblies 2. Electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 2, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0057] Please refer to Figure 3, which is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application. Embodiments of this application provide an energy storage device 200, including one or more battery clusters to increase the voltage and capacity of the energy storage device 200. A battery cluster may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of the energy storage device 200. When the energy storage device 200 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 200. The 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, etc. The energy storage device 200 can store electrical energy as needed and output electrical energy at appropriate times. For example, the energy storage device 200 can store electrical energy during off-peak hours and provide electrical energy to relevant users or electrical equipment during peak hours. The energy storage system provided in this application can be any power system that requires the energy storage device 200. In some embodiments, the energy storage device 200 is an energy storage container or an energy storage cabinet.

[0058] In some embodiments, the energy storage device 200 may include a cabinet and one or more battery clusters housed in the cabinet.

[0059] In some embodiments, the energy storage device 200 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0060] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via pipelines for regulating the temperature of the individual battery cells 10.

[0061] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0062] As an example, the central control module can serve as the battery management unit of the energy storage device 200, used to monitor and manage the energy storage device 200. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 200. For example, it can control the charging and discharging current and voltage of the energy storage device 200. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0063] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0064] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device 200.

[0065] In some embodiments, the energy storage system may include one or more energy storage devices 200 and a power converter system (PCS), wherein the power converter system 300 is connected between the power generation device 400 and the energy storage device 200. The power generation device 400 generates electrical energy, which can be stored in the energy storage device 200 via the power converter system 300, and the electrical energy stored in the energy storage device 200 can be released back to the power generation device 400 via the power converter system 300. As an example, the power generation device 400 may specifically be a power grid, a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 400 is not limited in this application.

[0066] Please refer to Figure 4, which is a schematic diagram of the structure of a charging network provided in some embodiments of this application. This application provides a charging network including a charging pile 500 and an energy storage device 200. The charging pile 500 is electrically connected to the energy storage device 200, which provides electrical energy to the charging pile 500. The charging pile 500 is electrically connected to a battery device 100 in the energy storage device 200 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 500. The charging pile 500 has one or more connectors 600 for connecting to electrical equipment (such as a vehicle), thereby providing energy to the electrical equipment.

[0067] The energy storage device 200 can be located inside the charging pile 500 (e.g., an integrated energy storage and charging unit) or outside the charging pile 500.

[0068] According to some embodiments of this application, referring to Figures 5 and 6, this application provides a battery cell 10, which includes: a housing 1, an electrode assembly 2, and an insulating structure 3. The housing 1 includes a first housing wall 11 and a protrusion 12; the electrode assembly 2 is housed within the housing 1, the protrusion 12 protrudes from the surface of the first housing wall 11 facing the electrode assembly 2, and the protrusion 12 forms a recess 13 on the surface of the first housing wall 11 facing away from the electrode assembly 2. The insulating structure 3 includes a first insulating member 31, which covers the surface of the first housing wall 11 facing away from the electrode assembly 2, and a portion of the first insulating member 31 is attached to the inner wall of the recess 13.

[0069] The outer shell 1 refers to the structure that provides a closed environment for the electrode assembly 2. It can be a capless structure, such as an enclosed aluminum shell; or it can be a combination of a shell 1a and an end cap 1b. The first shell wall 11 refers to one side wall of the outer shell 1, which can be the bottom wall, side wall, or top wall of the outer shell 1. Specifically, in some embodiments, the first shell wall 11 is the bottom wall of the outer shell 1 in the vertical direction. At the same time, a protrusion 12 is provided on the first shell wall 11, which protrudes into the outer shell 1, so that the protrusion 12 forms a pressure relief channel on the first shell wall 11 facing the electrode assembly 2. In this way, when the battery cell 10 experiences thermal runaway, the gas pressure will break through the first shell wall 11 from the pressure relief channel, achieving effective bottom explosion protection. The first shell wall 11 is provided with a pressure relief mechanism 4 to allow the gas pressure to be discharged from the pressure relief mechanism 4, as shown in Figure 7. In addition, the shape of the protrusion 12 can be designed in various ways and is not limited to the structure shown in Figure 4. For example, the cross-sectional shape of the protrusion 12 can be, but is not limited to, a frustum shape or a hemisphere shape.

[0070] Meanwhile, the protrusion 12 forms a recess 13 on the surface of the first shell wall 11 facing away from the electrode assembly 2. In this way, when the protrusion 12 is prepared on the first shell wall 11, the protrusion 12 can be integrally formed on the first shell wall 11 by means of stamping or other methods, which simplifies the preparation process of the protrusion 12 and reduces the processing cost.

[0071] The first insulating element 31 refers to a structure that provides insulation protection to the outer surface of the first shell wall 11. Its material can be, but is not limited to, insulating varnish or insulating rubber. When the first insulating element 31 covers the surface of the first shell wall 11 facing away from the electrode assembly 2, if there is a gap between the first insulating element 31 and the recess 13, partial discharge will occur in this gap when subjected to voltage. The partial discharge generates charged particle impacts, causing the local temperature of the gap to rise. Heat accumulation leads to overheating or even carbonization of the first insulating element 31, resulting in loss of insulation capability. Simultaneously, compounds such as ozone and nitrogen oxides generated by the partial discharge corrode the insulating material, shortening the insulation life and causing the insulating structure 3 to fail to meet insulation requirements.

[0072] Therefore, in this embodiment, a portion of the first insulating member 31 is attached to the inner wall of the recess 13, so that no gap is generated between the first insulating member 31 and the inner wall of the recess 13, reducing the possibility of partial discharge occurring in the recess 13. Specifically, when a portion of the first insulating member 31 is attached to the inner wall of the recess 13, the first insulating member 31 can completely fill the recess 13; alternatively, a structure of uniform thickness can be formed on the inner wall of the recess 13, so that the portion of the first insulating member 31 located within the recess 13 also has a corresponding concave structure. For example, the first insulating member 31 can be coated onto the inner wall of the recess 13 using methods such as electrophoresis, spraying, or printing.

[0073] With this design, the first insulating member 31 fits tightly against the recess 13 of the first shell wall 11, so that no gap is generated between the first insulating member 31 and the inner wall of the recess 13, reducing the possibility of partial discharge at the recess 13 and effectively improving the insulation performance of the bottom of the battery cell 10 and the life of the insulating material.

[0074] According to some embodiments of this application, referring to FIG5, the first insulating member 31 includes a bonding portion 311 and a peripheral portion 312 located on the outer periphery of the bonding portion 311. The bonding portion 311 is bonded to the inner wall of the recess 13, and the peripheral portion 312 is bonded to the area on the first shell wall 11 other than the recess 13.

[0075] The bonding portion 311 refers to the structure in which the first insulating member 31 is bonded to the recess 13, and the peripheral portion 312 is the structure in which the first insulating member 31 is bonded to the area other than the recess 13. The peripheral portion 312 surrounds the outer periphery of the bonding portion 311 and connects to the bonding portion 311 to form a complete first insulating member 31. When there are multiple recesses 13, there are also multiple bonding portions 311, and the bonding portion 311 and the recess 13 are provided one-to-one. At the same time, the peripheral portion 312 surrounds the outer periphery of each bonding portion 311.

[0076] Meanwhile, when the fitting portion 311 is fitted onto the inner wall of the recess 13, its thickness can remain constant, so that the surface of the fitting portion 311 facing away from the recess 13 can also form a concave structure. Of course, in some embodiments, the fitting portion 311 can also fill the recess 13, so that no gap is generated between the fitting portion 311 and the inner wall of the recess 13. In this case, the surface of the fitting portion 311 facing away from the recess 13 is flat, as shown in Figure 8.

[0077] This design, with the first insulating member 31 configured as a bonding portion 311 and a peripheral portion 312, allows the first insulating member 31 to better adhere to the surface of the first shell wall 11 facing away from the electrode assembly 2. This not only improves the bonding strength between the first insulating member 31 and the first shell wall 11, but also enhances the insulation protection of the first shell wall 11, thereby improving the insulation performance of the battery cell 10 and the service life of the insulation material.

[0078] According to some embodiments of this application, referring to FIG5, the fitting portion 311 is fitted to the inner wall of the recess 13, and a groove 314 is formed on the side of the fitting portion 311 facing away from the recess 13.

[0079] It is understood that there are various ways to form a groove 314 on the side of the bonding portion 311 facing away from the recess 13, such as forming a layer of bonding portion 311 on the inner wall of the recess 13 by spraying, electrophoresis, or printing. Since the side of the bonding portion 311 facing away from the recess 13 has a groove 314, when the battery cell 10 is bonded to the battery device 100, the adhesive can penetrate into the groove 314, increasing the bonding area with the first insulating member 31 and thus improving the bonding strength. The shape of the groove 314 may or may not be the same as the shape of the recess 13.

[0080] With this design, a groove 314 is provided on the side of the bonding part 311 facing away from the recess 13, which facilitates increasing the specific surface area of ​​the first insulating member 31, improving the bonding strength of the surface of the first insulating member 31, and helping to improve the stability of the battery cell 10 in the battery device 100.

[0081] According to some embodiments of this application, referring to Figures 9 and 10, the inner wall of the recess 13 includes a first wall 131 and second walls 132 respectively disposed on opposite sides of the first wall 131. The fitting portion 311 includes a first sub-part 31a and second sub-parts 31b respectively disposed on opposite sides of the first sub-part 31a. The two second sub-parts 31b and the first sub-part 31a surround to form a groove 314. The first sub-part 31a fits against the first wall 131, and the second sub-part 31b fits against the second wall 132.

[0082] It should be noted that the recess 13 can be understood as a structure formed by the inward indentation of the surface of the first shell wall 11. A notch will be formed on the surface of the first shell wall 11 facing away from the electrode assembly 2. At this time, the first wall 131 is an inner wall of the recess 13 facing the notch, and the two second walls 132 are located on the inner walls on both sides of the notch. Each second wall 132 can be inclined relative to the first wall 131. For example, the angle between the second wall 132 and the first wall 131 can be a right angle or an obtuse angle.

[0083] Meanwhile, the two second sub-parts 31b refer to the structures where the fitting part 311 is connected to the peripheral part 312 respectively. The angle between the second sub-part 31b and the first sub-part 31a can be the same as or different from the angle between the first wall 131 and the second wall 132. Specifically, in some embodiments, the two second walls 132 are inclined relative to the first wall 131 in a direction away from each other, and the two second sub-parts 31b are inclined relative to the first sub-part 31a in a direction away from each other.

[0084] With this design, the recess 13 is designed as a first wall 131 and two second walls 132, and the fitting part 311 is designed as a first sub-part 31a and two second sub-parts 31b, so that when the fitting part 311 is fitted into the recess 13, a groove 314 is formed on the side of itself facing away from the recess 13.

[0085] According to some embodiments of this application, referring to FIG5, the first insulating member 31 includes a covering portion 313, and the outer shell 1 also includes a second shell wall 14 surrounding the outer periphery of the first shell wall 11, wherein the covering portion 313 is configured to cover at least a portion of the second shell wall 14.

[0086] The second shell wall 14 refers to the annular structure surrounding the first shell wall 11. Its shape can be various, such as, but not limited to, cylindrical or quadrangular prism. When the covering portion 313 of the first insulating member 31 covers the outer surface of the first shell wall 11, it also covers at least a portion of the second shell wall 14, making the insulation protection of the first shell wall 11 more effective. Simultaneously, it reduces creepage discharge phenomena on the second shell wall 14 during insulation testing of the first shell wall 11.

[0087] The covering portion 313 refers to the structure where the first insulating member 31 covers the second shell wall 14. In some embodiments, the covering height of the covering portion 313 on the second shell wall 14 can be greater than or equal to 10 mm. Of course, considering the cost of insulation protection, the covering height of the first insulating member 31 on the second shell wall 14 should be minimized while meeting the creepage safety requirements during testing. In addition, when the first insulating member 31 also includes a bonding portion 311 and a peripheral portion 312 located on the outer periphery of the bonding portion 311, the covering portion 313 surrounds the outer periphery of the peripheral portion 312.

[0088] This design extends the covering portion 313 of the first insulating member 31 to cover the second shell wall 14, improving the insulation protection effect of the first insulating member 31 on the first shell wall 11; at the same time, it also reduces the creepage discharge phenomenon on the second shell wall 14 during the insulation test of the first shell wall 11.

[0089] According to some embodiments of this application, referring to FIG5, both the fitting portion 311 and the recess 13 include multiple portions, and the two are arranged one-to-one, with the peripheral portion 312 located on the outer periphery of each fitting portion 311.

[0090] It is known that when the first insulating member 31 covers the surface of the first shell wall 11 facing away from the electrode assembly 2, each bonding part 311 is bonded to the corresponding recess 13; at the same time, the peripheral part 312 is bonded to the area of ​​the first shell wall 11 other than each recess 13.

[0091] This design introduces multiple fitting portions 311 and recesses 13, further improving the bonding strength between the first insulating member 31 and the first shell wall 11, thereby achieving more effective insulation protection for the first shell wall 11.

[0092] According to some embodiments of this application, referring to FIG5, the thickness of the first insulating member 31 is denoted as h, wherein 50mm≤h≤300mm.

[0093] If the thickness of the first insulating component 31 is too small, the insulation protection of the first shell wall 11 will be reduced; if the thickness of the first insulating component 31 is too large, it will occupy too much space in the height direction X of the battery cell 10. Therefore, the thickness of the first insulating component 31 is controlled between 50mm and 300mm, for example, but not limited to 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, etc.

[0094] This design controls the thickness of the first insulating component 31 to between 50mm and 300mm, reducing the space occupied in the height direction X while maximizing the insulation protection of the first shell wall 11 and improving the insulation performance of the battery cell 10.

[0095] According to some embodiments of this application, the thickness h also satisfies the condition: 60mm≤h≤80mm.

[0096] The thickness of the first insulating component 31 can also be controlled between 60mm and 80mm, for example, but not limited to 60mm, 65mm, 70mm, 75mm, 80mm, etc.

[0097] This design controls the thickness of the first insulating component 31 to between 60mm and 80mm, effectively balancing space occupancy in the height direction X and the insulation performance of the battery cell 10.

[0098] According to some embodiments of this application, referring to FIG5, the insulating structure 3 further includes a second insulating member 32, which covers the outer shell 1 on the side surrounding the outer periphery of the first shell wall 11 and is connected to the first insulating member 31.

[0099] The second insulating element 32 covers the side of the outer shell 1, and the first insulating element 31 covers the first shell wall 11. The second insulating element 32 is connected to the first insulating element 31, indicating that the first insulating element 31 and the second insulating element 32 can form a complete protective structure, effectively insulating and protecting the outer shell 1. There are various ways to connect the second insulating element 32 and the first insulating element 31, such as: the second insulating element 32 covering the side of the first insulating element 31 facing away from the outer shell 1; or the end of the second insulating element 32 being spliced ​​with the end of the first insulating element 31, etc. The second insulating element 32 can be an insulating varnish or a blue film, such as PET (Polyethylene terephthalate) film, etc.

[0100] In some specific embodiments, please refer to FIG5. The outer shell 1 further includes a second shell wall 14 surrounding the outer periphery of the first shell wall 11. The second insulating member 32 is at least covered on the second shell wall 14, and one end of the second insulating member 32 is flush with the surface of the first shell wall 11 facing away from the electrode assembly 2.

[0101] This design introduces a second insulating component 32, making the insulation protection of the outer casing 1 more effective and reliable, and further improving the insulation performance of the battery cell 10.

[0102] According to some embodiments of this application, referring to FIG5, a portion of the first insulating member 31 covers the side of the outer shell 1 surrounding the outer periphery of the first shell wall 11, and the end of the second insulating member 32 near the first shell wall 11 covers the surface of the second insulating member 32 facing away from the outer shell 1.

[0103] It can be seen that the first insulating member 31, in addition to covering the first shell wall 11, also covers the side of the outer shell 1. When a part of the first insulating member 31 covers the side of the outer shell 1, the second insulating member 32 covers the side of the outer shell 1, and one end of it also covers the surface of the first insulating member 31 facing away from the outer shell 1, so that the two are connected to each other and form a complete protective structure.

[0104] In some specific embodiments, please refer to FIG5. The first insulating member 31 further includes a covering portion 313 surrounding the periphery of the outer peripheral portion 312, and the outer shell 1 further includes a second shell wall 14 surrounding the periphery of the first shell wall 11. The covering portion 313 covers at least a portion of the second shell wall 14. One end of the second insulating member 32 covers the surface of the covering portion 313 facing away from the second shell wall 14.

[0105] This design, which overlaps the second insulating element 32 and the first insulating element 31 on the side of the outer casing 1, not only facilitates the connection between the two but also helps to improve the insulation protection of the outer casing 1 and enhance the insulation effect.

[0106] According to some embodiments of this application, the second insulating member 32 is configured to cover the side of the outer shell 1 surrounding the outer periphery of the first shell wall 11 by means of film layer attachment.

[0107] The film-layer attachment method refers to attaching the surface of the second insulating element 32 to the side of the outer casing 1, so that the second insulating element 32 tightly wraps around the outer casing 1. In some examples, the second insulating element 32 may be a blue film.

[0108] This design, which attaches the second insulating element 32 to the side of the outer casing 1 using a film-layer bonding method, not only simplifies the process but also improves the insulation protection of the side of the outer casing 1.

[0109] According to some embodiments of this application, the first insulating element 31 is configured to have a structure of one or more of epoxy material, polyimide material, and acrylic material.

[0110] The material of the first insulating element 31 can be one of epoxy material, polyimide material, or acrylic material; at the same time, during construction, the first insulating element 31 can be formed on the first shell wall 11 by electrophoresis, spraying or printing.

[0111] This design, using at least one of epoxy, polyimide, and acrylic materials as the material for the first insulating element 31, not only improves insulation but also helps the first insulating element 31 adhere to the inner wall of the recess 13, eliminating the gap between the first insulating element 31 and the recess 13 and reducing the risk of partial discharge.

[0112] According to some embodiments of this application, referring to FIG3, the outer casing 1 includes a housing 1a and an end cap 1b covering the housing 1a, and the end of the housing 1a away from the end cap 1b includes a first housing wall 11.

[0113] It can be seen that the end cap 1b and the housing 1a cooperate to form a receiving space for the electrode assembly 2. At this time, the first housing wall 11 is located on the housing 1a at the end opposite to the end cap 1b. Meanwhile, in some embodiments, the housing 1a also includes a second housing wall 14 surrounding the outer periphery of the first housing wall 11.

[0114] This design, with the introduction of end cap 1b and housing 1a, facilitates the sealing of electrode assembly 2, providing it with a closed environment.

[0115] According to some embodiments of this application, the first insulating member 31 is configured to be formed by coating or electrophoresis on the inner wall of the recess 13 and the surface of the first shell wall 11 facing away from the electrode assembly 2.

[0116] When the first insulating element 31 is coated or electrophoretically formed on the inner wall of the recess 13 and the surface of the first shell wall 11, its forming thickness can maintain a certain uniformity, which is beneficial to improving the insulation performance of the first shell wall 11. At the same time, coating and electrophoresis make it easier for the first insulating element 31 to adhere to the inner wall of the recess 13, reducing the possibility of gaps between the first insulating element 31 and the recess 13.

[0117] This design, using coating or electrophoresis, helps to improve the insulation performance of the first shell wall 11; at the same time, it also reduces the possibility of gaps between the first insulating element 31 and the recess 13, and reduces the probability of partial discharge.

[0118] According to some embodiments of this application, referring to FIG7, the battery cell 10 further includes a pressure relief mechanism 4, which is disposed on the first shell wall 11.

[0119] It can be seen that both the pressure relief mechanism 4 and the protrusion 12 are disposed on the first shell wall 11. The protrusion 12 protrudes towards the interior of the outer shell 1, forming a pressure relief channel on the surface of the first shell wall 11 facing the electrode assembly 2. This allows the pressure to be stably released from the pressure relief mechanism 4 on the first shell wall 11 when thermal runaway occurs in the battery cell 10. When the first shell wall 11 is the bottom wall of the outer shell 1, the pressure relief method for the battery cell 10 is bottom pressure relief.

[0120] The structure of the pressure relief mechanism 4 can be varied, such as, but not limited to, an explosion-proof membrane, a pressure relief valve, etc.

[0121] This design places both the pressure relief mechanism 4 and the protrusion 12 on the first bottom wall, ensuring stable pressure relief in the pressure relief mechanism 4 and improving the reliability of the battery cell 10.

[0122] According to some embodiments of this application, referring to FIG7, the pressure relief mechanism 4 includes a grooved portion 41, which is recessed on the surface of the first housing wall 11 facing and / or away from the electrode assembly 2.

[0123] The notched portion 41 refers to a recessed structure on the first shell wall 11. In the event of thermal runaway, the gas pressure can break through the notched portion 41, achieving effective pressure relief. In some specific examples, a scribe can be used to score at least one surface of the first shell wall 11 to form a thinner, weaker structure. For example, the thickness of the first shell wall 11 on the notched portion 41 is less than the thickness of the first shell wall 11 in the area excluding the notched portion 41.

[0124] The etched portion 41 can be disposed on the surface of the first shell wall 11 facing the electrode assembly 2, or on the surface of the first shell wall 11 facing away from the electrode assembly 2; of course, the etched portion 41 can be disposed on both surfaces of the first shell wall 11. When the etched portion 41 is disposed on both surfaces of the first shell wall 11, the etched portions 41 on the two surfaces are opposite each other along the thickness direction of the first shell wall 11. Furthermore, the number of etched portions 41 can be one or multiple. When the number of etched portions 41 is multiple, the distribution of all etched portions 41 can be varied, for example, all etched portions 41 can form a cross-shaped structure, an H-shaped structure, etc.

[0125] This design, with the introduction of the grooved section 41, facilitates directional pressure relief from the first shell wall 11 in the event of thermal runaway, thereby improving the reliability of the battery cell 10.

[0126] According to some embodiments of this application, this application provides a battery device 100, which includes a battery cell 10 as described above.

[0127] According to some embodiments of this application, this application provides an electrical device that includes the battery device 100 described above.

[0128] According to some embodiments of this application, this application provides an energy storage device, which includes the battery device described above.

[0129] According to some embodiments of this application, referring to FIG3, this application provides an energy storage system, which includes a power conversion device and an energy storage device as described above. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0130] According to some embodiments of this application, please refer to FIG4, this application provides a charging network, which includes charging piles and one or more energy storage devices or one or more energy storage systems, wherein the energy storage devices are used to provide electrical energy to the charging piles.

[0131] According to some embodiments of this application, referring to Figures 5 to 10, this application provides a battery cell 10, which includes a casing 1, an electrode assembly 2, and an insulating structure 3. The insulating structure 3 includes a first insulating element 31 and a second insulating element 32. The first insulating element 31 is disposed on the first shell wall 11 of the casing 1 and is attached to the inner wall of the recess 13 of the first shell wall 11. The second insulating element 32 covers the second shell wall 14 surrounding the outer periphery of the first shell wall 11 on the casing 1. The first insulating element 31 can be tightly attached to the first shell wall 11 by electrophoresis, spraying, printing, etc., and the second insulating element 32 can be a blue film. That is, the blue film structure is removed from the first shell wall 11 of the casing 1, and the first insulating element 31 is attached. This not only provides insulation but also eliminates the gap between the insulating structure 3 and the casing 1, reducing the probability of partial discharge and improving the insulation performance of the battery cell 10 and extending the service life of the insulating material.

[0132] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, the battery cell comprising: The outer shell (1) includes a first shell wall (11) and a protrusion (12); An electrode assembly (2) is housed within the housing (1), the protrusion (12) protrudes from the surface of the first housing wall (11) facing the electrode assembly (2), and the protrusion (12) forms a recess (13) on the surface of the first housing wall (11) facing away from the electrode assembly (2); as well as The insulating structure (3) includes a first insulating member (31) that covers the surface of the first shell wall (11) facing away from the electrode assembly (2), and a portion of the first insulating member (31) is attached to the inner wall of the recess (13).

2. The battery cell according to claim 1, wherein, The first insulating member (31) includes a bonding portion (311) and a peripheral portion (312) located on the outer periphery of the bonding portion (311). The bonding portion (311) is bonded to the inner wall of the recess (13), and the peripheral portion (312) is bonded to the area on the first shell wall (11) other than the recess (13).

3. The battery cell according to claim 2, wherein, The fitting part (311) is fitted to the inner wall of the recess (13), and a groove (314) is formed on the side of the fitting part (311) facing away from the recess (13).

4. The battery cell according to claim 3, wherein, The inner wall of the recess (13) includes a first wall (131) and a second wall (132) respectively disposed on opposite sides of the first wall (131). The fitting part (311) includes a first sub-part (31a) and a second sub-part (31b) respectively disposed on opposite sides of the first sub-part (31a). The two second sub-parts (31b) and the first sub-part (31a) surround to form the groove (314). The first sub-part (31a) fits against the first wall (131), and the second sub-part (31b) fits against the second wall (132).

5. The battery cell according to any one of claims 1-4, wherein, The first insulating member (31) includes a covering portion (313), and the outer shell (1) further includes a second shell wall (14) surrounding the outer periphery of the first shell wall (11), wherein the covering portion (313) is configured to cover at least a portion of the second shell wall (14).

6. The battery cell according to any one of claims 2-5, wherein, Both the fitting portion (311) and the recess (13) include multiple portions, and are arranged one-to-one. The peripheral portion (312) is located on the outer periphery of each fitting portion (311).

7. The battery cell according to any one of claims 1-6, wherein, The thickness of the first insulating element (31) is denoted as h, where 50mm≤h≤300mm.

8. The battery cell according to claim 7, wherein, The thickness h also satisfies the condition: 60mm≤h≤80mm.

9. The battery cell according to any one of claims 1-8, wherein, The insulating structure (3) further includes a second insulating element (32), which covers the outer shell (1) on the side of the outer periphery of the first shell wall (11) and is connected to the first insulating element (31).

10. The battery cell according to claim 9, wherein, A portion of the first insulating member (31) covers the side of the outer shell (1) surrounding the outer periphery of the first shell wall (11), and the end of the second insulating member (32) near the first shell wall (11) covers the surface of the first insulating member (31) facing away from the outer shell (1).

11. The battery cell according to claim 9 or 10, wherein, The second insulating element (32) is configured to cover the outer side of the outer shell (1) surrounding the outer periphery of the first shell wall (11) by means of film layer attachment.

12. The battery cell according to any one of claims 1-11, wherein, The first insulating element (31) is configured to have a structure of one or more of epoxy material, polyimide material, and acrylic material.

13. The battery cell according to any one of claims 1-12, wherein, The outer casing (1) includes a housing (1a) and an end cap (1b) covering the housing (1a), wherein the end of the housing (1a) away from the end cap (1b) includes the first housing wall (11).

14. The battery cell according to any one of claims 1-13, wherein, The first insulating element (31) is configured to be formed by coating or electrophoresis on the inner wall of the recess (13) and the surface of the first shell wall (11) facing away from the electrode assembly (2).

15. The battery cell according to any one of claims 1-14, wherein, The battery cell also includes a pressure relief mechanism (4), which is located on the first shell wall (11).

16. The battery cell according to claim 15, wherein, Multiple protrusions (12) are provided on both sides of the pressure relief mechanism (4).

17. The battery cell according to claim 15 or 16, wherein, On either side of the pressure relief mechanism (4), the protrusion (12) is distributed along the width direction of the first shell wall (11).

18. The battery cell according to any one of claims 15-17, wherein, The pressure relief mechanism (4) includes a groove (41) recessed on the surface of the first shell wall (11) facing and / or away from the electrode assembly (2).

19. The battery cell according to claim 18, wherein, The scoring portion (41) is configured to be scored on at least one surface of the first shell wall (11).

20. A battery device comprising a battery cell according to any one of claims 1-19.

21. An energy storage device comprising the battery device of claim 20.

22. An energy storage system comprising a power conversion device (300) and an energy storage device as claimed in claim 21, wherein the power conversion device (300) is used to electrically connect a power generation device (400) and the energy storage device.

23. A charging network, the charging network comprising: Charging piles (500) ； The energy storage device as claimed in claim 21 or the energy storage system as claimed in claim 22, wherein the energy storage device is used to provide electrical energy to the charging pile (500).

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