Battery cell, device, system and charging network

Abstract

The utility model provides a single battery, a device, a system and a charging network, and belongs to the technical field of batteries, the single battery comprises an electrode assembly, a shell and a top cover assembly, the shell forms a containing cavity with an opening, the containing cavity is used for containing the electrode assembly, and the shell comprises a side wall adjacent to the opening; the top cover assembly comprises a cover plate and an insulating part, the cover plate covers the opening of the shell so as to seal the accommodating cavity, and a liquid injection hole is formed in the cover plate; the insulating part is positioned on one side, facing the electrode assembly, of the cover plate; wherein the insulating part comprises a fluid inlet and a fluid outlet communicated with the fluid inlet, the fluid inlet is used for receiving electrolyte injected from the liquid injection hole, and the fluid outlet is located between the electrode assembly and the side wall and used for providing the electrolyte to a gap between the electrode assembly and the side wall. According to the embodiment of the invention, the infiltration uniformity of the electrode assembly can be improved, and the infiltration efficiency of the electrode assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, device, system and charging network. Background Art

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, playing a crucial role in promoting energy transformation and sustainable development. Battery technology is a crucial factor in the development of the new energy industry.

[0003] The battery cover is provided with an injection hole, and the electrolyte is sprayed on the electrode assembly through the injection hole to infiltrate the electrode assembly. On the one hand, the electrode assembly close to the injection hole has good wettability, while the electrode assembly far from the injection hole has poor wettability, resulting in uneven infiltration of the electrode assembly. On the other hand, the infiltration method of spraying the electrode assembly is less efficient. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a battery cell, device, system and charging network to improve the uniformity of electrode assembly wetting and enhance the efficiency of electrode assembly wetting.

[0005] An embodiment of the first aspect of the present application provides a battery cell, which includes an electrode assembly, a shell and a top cover assembly, the shell forming a accommodating cavity with an opening, the accommodating cavity being used to accommodate the electrode assembly, and the shell including a side wall adjacent to the opening; the top cover assembly including a cover plate and an insulating member, the cover plate covering the opening of the shell to close the accommodating cavity, the cover plate being provided with an injection hole; the insulating member being located on a side of the cover plate facing the electrode assembly; wherein the insulating member includes a fluid inlet and a fluid outlet connected to the fluid inlet, the fluid inlet being used to receive electrolyte injected from the injection hole, and the fluid outlet being located between the electrode assembly and the side wall for providing electrolyte to the gap between the electrode assembly and the side wall.

[0006] In the technical solution of the present embodiment, by arranging the fluid outlet between the electrode assembly and the sidewall, the electrolyte can flow into the bottom of the housing along the gap between the sidewall and the electrode assembly, thereby avoiding the top of the electrode assembly. This prevents the electrolyte from impacting the separator at the top of the electrode assembly and reduces the risk of shorting the positive and negative electrode sheets. Furthermore, the electrolyte infiltrates the electrode assembly from the bottom up, improving the uniformity of the electrode assembly's infiltration, enhancing the performance of the battery cells, and also increasing the efficiency of the electrode assembly's infiltration.

[0007] In some embodiments, the insulating member includes a first portion and a second portion. The first portion is connected to the cover plate, with the fluid inlet located in the first portion and positioned directly opposite the liquid injection hole. The second portion is connected to the first portion and located on a side of the first portion away from the cover plate, with the fluid outlet located in the second portion. The portion of the second portion where the fluid outlet is located is located within the gap between the electrode assembly and the sidewall. By designing the insulating member with a first and second portion, the dimensions can be flexibly adjusted to meet the internal space requirements of the housing, improving adaptability. Furthermore, the first portion isolates the electrode assembly from the cover plate, while the second portion isolates the electrode assembly from the sidewall, thereby reducing the risk of short circuits caused by contact between the electrode assembly and the metal housing.

[0008] In some embodiments, there are multiple second portions, each of which is spaced apart around the electrode assembly. By arranging multiple second portions and spacing them apart around the electrode assembly, the electrolyte can be introduced into different locations within the housing using the fluid outlets of different second portions, further improving the uniformity of wetting of the electrode assembly.

[0009] In some embodiments, the orthographic projection of the second portion is completely offset from the orthographic projection of the electrode assembly in a plane perpendicular to the thickness of the cover plate. By designing the structure of the second portion, the orthographic projection of the second portion is completely offset from the orthographic projection of the electrode assembly. This allows the second portion to better insulate the electrode assembly from the sidewalls of the housing, improving the reliability of the battery cell insulation and better positioning the electrode assembly.

[0010] In some embodiments, the sidewalls include two first sidewalls disposed opposite each other along the length of the cover plate, and two second sidewalls disposed opposite each other along the width of the cover plate; the area of ​​the first sidewalls is smaller than the area of ​​the second sidewalls; and the portion of the second portion provided with the fluid outlet is disposed between the first sidewall and the electrode assembly. By disposing the second portion between the first sidewall and the electrode assembly, the space between the first sidewall and the electrode assembly is fully utilized, reducing the space occupied by other internal space within the housing, improving the space utilization within the housing, and facilitating an increase in the volumetric energy density of the battery cells.

[0011] In some embodiments, the second portion is provided in multiple locations, with some of the second portions being disposed between the second sidewall and the electrode assembly, and some of the second portions being disposed between the first sidewall and the electrode assembly. Disposing the second portions between the second sidewall and the electrode assembly, and between the first sidewall and the electrode assembly, respectively, allows the electrolyte to flow into the bottom of the housing from different locations, thereby improving the efficiency and uniformity of the electrode assembly's wetting.

[0012] In some embodiments, the first portion is provided with a first opening communicating with the second portion, and a second opening staggered from the first opening; the second opening is located on the side of the first portion directly opposite the sidewall, and in a plane perpendicular to the thickness of the cover plate, the orthographic projection of the second opening is located between the orthographic projection of the electrode assembly and the orthographic projection of the sidewall. Providing an additional second opening in the first portion that communicates with the housing cavity can facilitate rapid electrolyte diversion, shortening injection time and improving the efficiency of electrode assembly wetting.

[0013] In some embodiments, the second opening is located on the side of the first portion that faces the second sidewall. Providing the second opening on the side of the first portion that faces the second sidewall allows electrolyte to be injected between the second sidewall and the electrode assembly, ensuring that electrolyte is injected between each sidewall and the electrode assembly, thereby improving the uniformity of electrode assembly wetting. Furthermore, the design of the second opening reduces the internal space occupied by the physical structure of the housing, thereby increasing the volumetric energy density of the battery cell.

[0014] In some embodiments, the first portion is provided with a first flow channel connected to the fluid inlet, and the second portion is provided with a second flow channel connected to the first flow channel and the fluid outlet. The first flow channel includes a collection area and a diversion area. The collection area is arranged directly opposite the fluid inlet, and the orthographic projection area of ​​the collection area on the surface of the cover plate facing the electrode assembly is larger than the orthographic projection area of ​​the fluid inlet on the surface of the cover plate facing the electrode assembly. The diversion area connects the collection area and the second flow channel. By designing the first flow channel as a collection area and a diversion area, electrolyte can be buffered and the flow rate of the electrolyte can be controlled, thereby improving the flexibility and uniformity of the electrolyte flow.

[0015] In some embodiments, the width of the flow channel of the flow guide region gradually increases along the direction from the converging region to the second flow channel. By adopting a structural design in which the width of the flow guide region gradually increases along the flow direction, the flow coverage of the electrolyte entering the second portion is further improved, thereby enhancing the uniformity of electrolyte injection. Furthermore, the flow velocity of the electrolyte decreases due to the increase in flow channel width, thereby reducing the flow velocity of the electrolyte entering the second portion and minimizing pressure loss.

[0016] In some embodiments, the number of guide areas and the number of second flow channels are both multiple, and the guide areas are connected to the second flow channels in a one-to-one correspondence. By providing multiple correspondingly connected guide areas and second flow channels, the electrolyte can be injected into the housing from different positions, improving the uniformity and stability of injection at different positions, while also accelerating the speed of electrolyte diversion and improving the wetting efficiency of the electrode assembly.

[0017] In some embodiments, the second portion is a hollow tubular structure. By utilizing the flow channel formed by the hollow tubular structure, the electrolyte can directly and quickly reach the gap between the electrode assembly and the sidewall, improving injection efficiency. Furthermore, the hollow tubular structure is simple and easy to manufacture and install.

[0018] In some embodiments, the second portion is a flat-mouthed tube, and the long side of the second portion's cross section extends parallel to the surface of the sidewall. This flat-mouthed tube design reduces the space occupied by the second portion between the electrode assembly and the sidewall, facilitating placement of the second portion between the electrode assembly and the sidewall. It also increases the area of ​​the second portion facing the first sidewall, improving space utilization and thus enhancing wetting uniformity.

[0019] In some embodiments, the first portion and the second portion are integrally formed, which can reduce the number of installation steps during installation, facilitate mass production, and reduce production costs.

[0020] In some embodiments, the cover plate further includes a first pressure relief hole, and the insulating member includes a second pressure relief hole, with the first pressure relief hole communicating with the second pressure relief hole. Separately providing the first and second pressure relief holes and communicating the first and second pressure relief holes facilitates the discharge of gas from the housing, avoids liquid sealing, and improves wetting uniformity.

[0021] An embodiment of a second aspect of the present application provides a battery device, which includes the battery cell in the above embodiment.

[0022] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0023] An embodiment of the fourth aspect of the present application provides an energy storage device, which includes a plurality of battery cells or battery devices in the above embodiments, and the battery cells or battery devices are used to store or provide electrical energy.

[0024] An embodiment of the fifth aspect of the present application provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiment, and the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0025] An embodiment of the sixth aspect of the present application provides a charging network, which includes a charging pile and the energy storage device in the above embodiment or the energy storage system in the above embodiment, and the energy storage device or the energy storage system is used to provide electrical energy for the charging pile.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0028] Figure 1 Schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0029] Figure 2 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0030] Figure 3 This is a schematic diagram of the structure of the energy storage system in some embodiments of the present application;

[0031] Figure 4 This is a schematic diagram of the structure of a charging network in some embodiments of the present application;

[0032] Figure 5 This is a schematic structural diagram of a first top cover assembly in some embodiments of the present application;

[0033] Figure 6 This is a schematic diagram of the exploded structure of a first top cover assembly according to some embodiments of the present application;

[0034] Figure 7 A cross-sectional view of a first top cover assembly according to some embodiments of the present application;

[0035] Figure 8 This is a schematic structural diagram of a second top cover assembly in some embodiments of the present application;

[0036] Figure 9 This is a schematic structural diagram of an insulating member in some embodiments of the present application;

[0037] Figure 10 This is a schematic diagram of the exploded structure of a third top cover assembly according to some embodiments of the present application;

[0038] Figure 11 This is a schematic diagram of the exploded structure of a fourth top cover assembly according to some embodiments of the present application;

[0039] Figure 12 This is a schematic diagram of the exploded structure of a fifth top cover assembly in some embodiments of the present application.

[0040] Description of reference numerals:

[0041] 10. Battery device; 20. Energy storage device; 30. Power conversion device; 40. Power generation equipment; 50. Charging pile; 60. Connector; 100. Battery cell; 110. Top cover assembly; 111. Cover plate; 1111. Electrode terminal; 1112. Mounting groove; 1113. Liquid injection hole; 1114. First pressure relief hole; 1115. Explosion-proof through hole; 1116. Post hole; 112. Insulator; 1121. First part; 1122. First part Part two; 1123, second pressure relief hole; 1124, first opening; 1125, second opening; 113, fluid inlet; 114, fluid outlet; 115, first flow channel; 1151, collection area; 1152, guide area; 116, second flow channel; 120, shell; 121, first side wall; 122, second side wall; 130, electrode assembly; 131, tab; 200, box; 210, first part; 220, second part. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0050] Currently, market developments indicate that rechargeable batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in various electronic devices, including electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, market demand is also growing.

[0051] The battery cover is provided with an injection hole, through which electrolyte is injected into the battery shell to infiltrate the electrode assembly, so that during the battery charging and discharging process, the positive electrode active material and the negative electrode active material in the electrode assembly react with the electrolyte.

[0052] In some embodiments, the injection hole faces the electrode assembly, and the injection of electrolyte directly impacts the electrode assembly's diaphragm, potentially causing a short circuit between the positive and negative electrodes. Furthermore, this injection method can result in better wetting of the electrode assembly near the injection hole and less so of the electrode assembly farther away, leading to uneven wetting of the electrode assembly and thus affecting the performance of the battery cell. Furthermore, the infiltration method, where the electrolyte flows directly into the electrode assembly, is less efficient and may also cause liquid sealing issues in the central area of ​​the electrode assembly.

[0053] To address the above-mentioned issues, embodiments of the present application provide a battery cell, device, system, and charging network. The battery cell includes an electrode assembly, a housing, and a top cover assembly. The housing forms a receiving cavity with an opening for receiving the electrode assembly, and the housing includes a sidewall adjacent to the opening. The top cover assembly includes a cover plate and an insulating member. The cover plate is engaged with the opening of the housing to seal the receiving cavity, and the cover plate is provided with an injection hole. The insulating member is located on the side of the cover plate facing the electrode assembly. The insulating member includes a fluid inlet and a fluid outlet connected to the fluid inlet. The fluid inlet is configured to receive electrolyte injected from the injection hole. The fluid outlet is located between the electrode assembly and the sidewall to provide electrolyte to the gap between the electrode assembly and the sidewall. By arranging the fluid outlet between the electrode assembly and the sidewall, the electrolyte can flow into the bottom of the housing along the gap between the sidewall and the electrode assembly, thereby avoiding the top of the electrode assembly, preventing the electrolyte from impacting the separator at the top of the electrode assembly, and reducing the risk of shorting the positive and negative electrode sheets. In addition, the electrolyte infiltrates the electrode assembly from bottom to top, which can improve the uniformity of the electrode assembly infiltration, enhance the performance of the battery cell, and also enhance the efficiency of the electrode assembly infiltration.

[0054] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to improve the uniformity of electrode assembly wetting and enhance the performance of the battery cells.

[0055] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0056] An embodiment of the present application also provides an energy storage device that uses a battery as a power source. The energy storage device may be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0057] For the convenience of description, the following embodiments are described by taking a battery device according to an embodiment of the present application as an example.

[0058] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the exploded structure of a battery device according to some embodiments of the present application. The battery device 10 includes a housing 200 and a battery cell 100, with the battery cell 100 being housed within the housing 200. The housing 200 is used to provide a storage space for the battery cell 100, and the housing 200 can adopt a variety of structures. In some embodiments, the housing 200 can include a first portion 210 and a second portion 220, which cover each other and together define a storage space for accommodating the battery cell 100. The second portion 220 can be a hollow structure with one end open, and the first portion 210 can be a plate-like structure, with the first portion 210 covering the open side of the second portion 220, so that the first portion 210 and the second portion 220 together define a storage space. The first portion 210 and the second portion 220 can also be hollow structures with one end open, with the open side of the first portion 210 covering the open side of the second portion 220. Of course, the box body 200 formed by the first part 210 and the second part 220 can be in various shapes, such as a cylinder, a cuboid, etc.

[0059] In the battery device 10, there may be multiple battery cells 100, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 100. The multiple battery cells 100 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 100 may be housed within the housing 200. Alternatively, the battery device 10 may comprise multiple battery cells 100 that are first connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 200. The battery device 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 100.

[0060] Each battery cell 100 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 100 may be cylindrical, flat, rectangular, or in other shapes.

[0061] Please refer to Figure 2 , Figure 2 Schematic diagram of the decomposition structure of the battery cell of some embodiments of the present application. Battery cell 100 refers to the smallest unit that makes up the battery. Figure 2As shown, the battery cell 100 includes a cover plate 111 , a housing 120 , an electrode assembly 130 and other functional components.

[0062] The cover plate 111 is a component that covers the opening of the housing 120 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the cover plate 111 can be adapted to the shape of the housing 120 to fit the housing 120. Optionally, the cover plate 111 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the cover plate 111 from deforming under pressure or collision, providing the battery cell 100 with greater structural strength and improved safety. Functional components such as electrode terminals 1111 can be provided on the cover plate 111. The electrode terminals 1111 can be used to electrically connect to the electrode assembly 130 to transfer electrical energy to or from the battery cell 100. In some embodiments, the cover plate 111 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. The cover plate 111 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating member may be provided inside the cover 111 to isolate the electrical connection components in the housing 120 from the cover 111 to reduce the risk of short circuits.

[0063] The housing 120 is a component that cooperates with the cover plate 111 to form the internal environment of the battery cell 100. This internal environment can be used to accommodate the electrode assembly 130, electrolyte, and other components. The housing 120 and cover plate 111 can be separate components. An opening can be provided in the housing 120, and the cover plate 111 is placed over the opening to form the internal environment of the battery cell 100. Alternatively, the cover plate 111 and housing 120 can be integrated. Specifically, the cover plate 111 and housing 120 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 120 needs to be enclosed, the cover plate 111 is placed over the housing 120. The housing 120 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 120 can be determined based on the specific shape and size of the electrode assembly 130. The housing 120 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0064] The electrode assembly 130 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 130 may be contained in the housing 120. The electrode assembly 130 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 131. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 131 connects to the electrode terminal 1111 to form a current loop.

[0065] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage system according to some embodiments of the present application. Embodiments of the present application provide an energy storage device 20 comprising one or more battery clusters to increase the voltage and capacity of the energy storage device 20. A battery cluster may include multiple battery devices 10 connected in series via a busbar to increase the voltage of the energy storage device 20. When the energy storage device 20 comprises multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 20. The energy storage device 20 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 20 can store electrical energy as needed and output it at the appropriate time. For example, the energy storage device 20 can store electrical energy during low-demand periods and provide it to users or electrical equipment during peak periods. The energy storage system provided in embodiments of the present application can be any power system that requires the energy storage device 20. In some embodiments, the energy storage device 20 is an energy storage container or an energy storage cabinet.

[0066] In some embodiments, the energy storage device 20 may include a cabinet and one or more battery clusters, where the battery clusters are housed in the cabinet.

[0067] In some embodiments, the energy storage device 20 may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0068] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells 100 to each battery device 10 through a pipeline.

[0069] For example, the master control module (MCM) can serve as the battery management unit (BMU) of a battery cluster, monitoring and managing the cluster. The MCM can monitor information such as the battery cluster's current, voltage, power, and temperature. For example, it can control the battery cluster's charge and discharge current and voltage. The MCM includes modules such as the slave battery management unit (SBMU) and the fusion switch.

[0070] As an example, the master control module can serve as the battery management unit of the energy storage device 20, used to monitor and manage the energy storage device 20. The master control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 20. For example, it can control the charge and discharge current and voltage of the energy storage device 20. As an example, the master control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH), and a fiber optic conversion module.

[0071] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., which are used to detect, alarm or extinguish fires in the energy storage system.

[0072] As an example, the power distribution device can be used to distribute power to the power modules of the energy storage device 20 .

[0073] In some embodiments, the energy storage system may include one or more energy storage devices 20 and a power converter device 30 (Power Converter System, PCS for short). The power converter device 30 is used to connect between the power generation device 40 and the energy storage device 20. The power generation device 40 is used to generate electrical energy. The electrical energy generated by the power generation device 40 can be stored in the energy storage device 20 through the power converter device 30, and the electrical energy stored in the energy storage device 20 can be released to the power generation device 40 through the power converter device 30. As an example, the power generation device 40 can be a power grid, a solar panel, a hydropower generation device 40, a thermal power generation device 40, a wind power generation device 40, etc. The specific type of the power generation device 40 is not limited in this application.

[0074] Please refer to Figure 4 , Figure 4The following is a schematic diagram of the structure of a charging network according to some embodiments of the present application. Embodiments of the present application provide a charging network, comprising a charging pile 50 and an energy storage device 20. The charging pile 50 is electrically connected to the energy storage device 20, and the energy storage device 20 is used to provide electrical energy to the charging pile 50. The charging pile 50 is electrically connected to the battery device 10 in the energy storage device 20 via a cable, and the battery device 10 can provide its stored electrical energy to the charging pile 50. The charging pile 50 has one or more connectors 60, which are used to connect to electrical equipment (such as a vehicle) to replenish energy to the electrical equipment.

[0075] The energy storage device 20 may be located inside the charging pile 50 (eg, an integrated storage and charging device), or may be located outside the charging pile 50 .

[0076] like Figure 2 and Figure 5 As shown, an embodiment of the present application provides a battery cell 100, which includes an electrode assembly 130, a shell 120 and a top cover assembly 110. The shell 120 forms a accommodating cavity with an opening, which is used to accommodate the electrode assembly 130. The shell 120 includes a side wall adjacent to the opening; the top cover assembly 110 includes a cover plate 111 and an insulating member 112. The cover plate 111 covers the opening of the shell 120 to close the accommodating cavity, and the cover plate 111 is provided with an injection hole 1113; the insulating member 112 is located on the side of the cover plate 111 facing the electrode assembly 130; wherein the insulating member 112 includes a fluid inlet 113 and a fluid outlet 114 connected to the fluid inlet 113, the fluid inlet 113 is used to receive electrolyte injected from the injection hole 1113, and the fluid outlet 114 is located between the electrode assembly 130 and the side wall to provide electrolyte to the gap between the electrode assembly 130 and the side wall.

[0077] The cover plate 111 covers the opening of the housing 120 to isolate the internal environment of the battery cell 100 from the external environment.

[0078] The housing 120 includes connected side walls and a bottom wall, with the side walls adjacent to the opening and the bottom wall opposite the opening. It is understood that the battery cell 100 can be a prismatic battery cell, in which case the corresponding housing 120 is a prismatic housing; the battery cell 100 can also be a cylindrical battery cell, in which case the housing 120 is a corresponding cylindrical housing.

[0079] In some embodiments, the cover plate 111 is provided with an injection hole 1113 for injecting the prepared electrolyte into the interior of the housing 120, so that the positive electrode active material and the negative electrode active material react with the electrolyte. The number of injection holes 1113 can be determined as needed, for example, one, two, etc.

[0080] The insulating member 112 is used to isolate the electrode assembly 130 from the cover plate 111 and is disposed between the electrode assembly 130 and the cover plate 111 to reduce the risk of short circuit caused by contact between the electrode assembly 130 and the cover plate 111. The insulating member 112 is made of, for example, plastic or rubber.

[0081] In some embodiments, the side of the insulating member 112 facing the cover plate 111 is connected to the inner side of the cover plate 111 by snapping, bonding, hot-melt connection, or other means. The inner side of the cover plate 111 is the side of the cover plate 111 facing the electrode assembly 130. In some embodiments, the side of the insulating member 112 facing the electrode assembly 130 is provided with a structure for fixing the electrode assembly 130, such as a boss, a slot, or other structure capable of fixing the electrode assembly 130.

[0082] The insulating member 112 includes a fluid inlet 113 , a fluid outlet 114 , and a flow channel connecting the fluid inlet 113 and the fluid outlet 114 .

[0083] The fluid inlet 113 is used to receive the electrolyte injected from the injection hole 1113 . The number and structure of the fluid inlet 113 can be determined according to actual needs.

[0084] In some embodiments, the number of fluid inlets 113 is the same as the number of injection holes 1113. For example, the number of injection holes 1113 and the number of fluid inlets 113 are both 2, and the fluid inlets 113 are arranged in a one-to-one correspondence with the injection holes 1113. In some embodiments, multiple injection holes 1113 correspond to the same fluid inlet 113, that is, the opening of the fluid inlet 113 is larger than the opening of the injection hole 1113, and a single fluid inlet 113 can receive electrolyte injected from multiple injection holes 1113.

[0085] The fluid outlet 114 is used to guide the electrolyte to the gap between the sidewall and the electrode assembly 130, including the electrolyte falling from the space between the sidewall and the electrode assembly 130 to the bottom of the housing 120, and the electrolyte flowing along the sidewall to the bottom of the housing 120. The electrolyte gradually infiltrates the electrode assembly 130 from the bottom to the top of the bottom of the housing 120 and gradually discharges the gas in the gap inside the housing 120 from the inside of the housing 120.

[0086] The fluid outlet 114 is positioned between the sidewall and the electrode assembly 130. Specifically, the orthographic projection of the fluid outlet 114 on the corresponding sidewall falls within the orthographic projection of the electrode assembly 130 on the sidewall. In other words, along the height of the battery cell 100, the fluid outlet 114 is located between the top and bottom of the electrode assembly 130. This allows the electrolyte to flow directly from the fluid outlet 114 between the sidewall and the electrode assembly 130 and toward the bottom of the housing, where it then soaks the electrode assembly 130 from the bottom up.

[0087] By arranging the fluid outlet 114 between the electrode assembly 130 and the sidewall, the electrolyte can flow into the bottom of the housing 120 along the gap between the sidewall and the electrode assembly 130, thereby avoiding the top of the electrode assembly 130. This prevents the electrolyte from impacting the separator at the top of the electrode assembly 130 and reduces the risk of shorting the positive and negative electrode sheets. In addition, the electrolyte infiltrates the electrode assembly 130 from the bottom up, which can improve the uniformity of the infiltration of the electrode assembly 130, enhance the performance of the battery cell 100, and also improve the efficiency of the infiltration of the electrode assembly 130.

[0088] like Figures 5 to 7 As shown, according to some embodiments of the present application, the insulating member 112 includes a first part 1121 and a second part 1122, the first part 1121 is connected to the cover plate 111, the fluid inlet 113 is located in the first part 1121 and is arranged opposite the injection hole 1113; the second part 1122 is connected to the first part 1121 and is located on the side of the first part 1121 away from the cover plate 111, and the fluid outlet 114 is located in the second part 1122; wherein, the part of the second part 1122 where the fluid outlet 114 is provided is located in the gap between the electrode assembly 130 and the side wall.

[0089] The first portion 1121 is located between the cover plate 111 and the electrode assembly 130 , is connected to the cover plate 111 , and is used to isolate the electrode assembly 130 from the cover plate 111 . The first portion 1121 is made of, for example, plastic, rubber, etc.

[0090] The first portion 1121 is provided with a fluid inlet 113, and the fluid inlet 113 and the injection hole 1113 correspond to each other in position. The electrolyte injected into the injection hole 1113 directly enters the fluid inlet 113. For example, the fluid inlet 113 and the injection hole 1113 are both circular holes, and the central axes of the two are on the same straight line, so that the electrolyte directly and accurately enters the fluid inlet 113 through the injection hole 1113.

[0091] A channel is provided inside the first portion 1121 , which is connected to the fluid inlet 113 and is used to transmit electrolyte. The channel includes a cavity structure, a flow channel structure, and the like.

[0092] The second portion 1122 may be a slender strip structure, with a first end of the second portion 1122 connected to the first portion 1121, and a second end of the second portion 1122 extending away from the cover plate 111 until it is located between the sidewall and the electrode assembly 130. The fluid outlet 114 is located at the second end of the second portion 1122. It will be appreciated that the fluid outlet 114 may be located at an end surface of the second end, or at a side surface close to the second end, for example, at a side surface facing the sidewall, or at a side surface facing the electrode assembly.

[0093] The second portion 1122 may be made of, for example, plastic or rubber. The material of the second portion 1122 may be the same as or different from that of the first portion 1121. The first portion 1121 and the second portion 1122 may be connected by snapping, bonding, hot-melt connection, or any other feasible connection method, or may be integrally formed by injection molding or other methods.

[0094] The insulating member 112 includes a flow channel connecting the fluid inlet 113 and the fluid outlet 114. Specifically, the flow channel may be partially disposed in the first portion 1121 and partially disposed in the second portion 1122. For example, the flow channel may be a hollow structure within the first portion 1121 and the second portion 1122.

[0095] By designing the insulating part 112 with a first part 1121 and a second part 1122, the matching size can be flexibly adjusted according to the requirements of the internal space of the shell 120 to improve adaptability. At the same time, the first part 1121 can achieve isolation between the electrode assembly 130 and the cover plate 111, and the second part 1122 can achieve isolation between the electrode assembly 130 and the side wall, thereby reducing the risk of short circuit caused by contact between the electrode assembly 130 and the metal shell.

[0096] like Figure 8 and Figure 9 As shown, according to some embodiments of the present application, there are multiple second portions 1122 , and the multiple second portions 1122 are spaced apart around the electrode assembly 130 .

[0097] Multiple second portions 1122 are respectively connected to the first portion 1121 and are spaced apart around the electrode assembly 130. The electrolyte is introduced into different locations within the housing 120 through the fluid outlets 114 of different second portions 1122. The number of second portions 1122 can be determined based on needs, for example, two or four.

[0098] In some embodiments, the battery cell 100 is a square-shell battery, which includes four side walls. The second part 1122 can be arranged between any side wall and the electrode assembly 130. For example, it can be arranged between two side walls opposite to each other along the length direction or width direction of the battery cell 100 and the electrode assembly 130 respectively, or between two adjacent side walls and the electrode assembly 130 respectively, or between four side walls and the electrode assembly 130 respectively, and so on.

[0099] In some embodiments, a plurality of second portions 1122 may be spaced apart between each side wall of the square-shell battery and the electrode assembly 130 .

[0100] In some embodiments, the battery cell 100 is a cylindrical battery having a circular sidewall. The second portion 1122 may be a single annular structure, arranged between the annular sidewall and the electrode assembly 130 . The second portion 1122 may be multiple, and the multiple second portions 1122 are arranged at intervals around the periphery of the electrode assembly 130 .

[0101] By arranging multiple second parts 1122 and spacing the multiple second parts 1122 around the electrode assembly 130, the electrolyte is introduced into different positions in the shell 120 using the fluid outlets 114 of different second parts 1122, thereby further improving the uniformity of the wetting of the electrode assembly 130.

[0102] like Figure 7 As shown, according to some embodiments of the present application, in a plane perpendicular to the thickness direction of the cover plate 111 , the orthographic projection of the second portion 1122 is completely offset from the orthographic projection of the electrode assembly 130 .

[0103] The thickness direction of the cover plate 111 can be the height direction of the battery cell 100, and the plane perpendicular to this direction is any horizontal plane, such as the surface of the cover plate 111 facing the electrode assembly 130, that is, the lower surface of the cover plate 111, or the upper surface of the bottom wall of the shell.

[0104] The orthographic projection of the second part 1122 and the orthographic projection of the electrode assembly 130 are completely offset, which means that there is no overlapping part between the orthographic projections of the two on the projection plane. It can be understood that the orthographic projections of the two on the projection plane are completely offset and can also include adjacent situations, that is, the outer edges of the orthographic projections of the two can partially overlap.

[0105] In some embodiments, the first part 1121 is located between the cover plate 111 and the electrode assembly 130, a portion of the second part 1122 is located between the side wall and the electrode assembly 130, another portion of the second part 1122 is connected to the side wall of the first part 1121, and the thickness direction of the first part 1121 is perpendicular to the thickness direction of the second part 1122.

[0106] By designing the structure of the second part 1122, the orthographic projection of the second part 1122 is completely staggered from the orthographic projection of the electrode assembly 130. This allows the second part 1122 to better insulate the electrode assembly 130 from the side wall of the shell, improve the insulation reliability of the battery cell 100, and better limit the electrode assembly 130.

[0107] like Figure 2 and Figure 7As shown, according to some embodiments of the present application, the side wall includes two first side walls 121 arranged opposite to each other along the length direction of the cover plate 111, and two second side walls 122 arranged opposite to each other along the width direction of the cover plate 111; the area of ​​the first side wall 121 is smaller than the area of ​​the second side wall 122; wherein, the part of the second part 1122 where the fluid outlet 114 is provided is arranged between the first side wall 121 and the electrode assembly 130.

[0108] The battery cell 100 is a square-shell battery, the cover plate 111 is a rectangular plate, and the shell 120 includes four side walls, namely two first side walls 121 and two second side walls 122. The two first side walls 121 have the same structural shape and are arranged opposite each other along the length direction of the cover plate 111. The distance between the two first side walls 121 is approximately equal to the length dimension of the cover plate 111. The two second side walls 122 have the same structural shape and are arranged opposite each other along the width direction of the cover plate 111. The distance between the two second side walls 122 is approximately equal to the width dimension of the cover plate 111. The length dimension of the cover plate 111 is greater than the width dimension of the cover plate 111. Therefore, the area of ​​the first side wall 121 is smaller than the area of ​​the second side wall 122. In other words, the second side wall 122 is the surface where the large surface of the battery cell is located.

[0109] The electrode assembly 130 is disposed within a housing cavity formed by the two first sidewalls 121 and the two second sidewalls 122. Given that the distance between the two first sidewalls 121 is greater than the distance between the two second sidewalls 122, the gap between the electrode assembly 130 and the first sidewall 121 is greater than the gap between the electrode assembly 130 and the second sidewall 122, providing ample housing space between the electrode assembly 130 and the first sidewall 121. At least a portion of the second portion 1122 is disposed between the first sidewall 121 and the electrode assembly 130. The second portion 1122, located between the first sidewall 121 and the electrode assembly 130, is provided with a fluid outlet 114. The fluid outlet 114 in this location facilitates rapid flow of electrolyte along the surface of the first sidewall 121 to the bottom of the housing 120.

[0110] By setting the second part 1122 between the first side wall 121 and the electrode assembly 130, the space between the first side wall 121 and the electrode assembly 130 is fully utilized, the occupation of other space inside the shell 120 is reduced, and the space utilization inside the shell 120 is improved, which is beneficial to improving the volume energy density of the battery cell 100.

[0111] like Figure 8 and Figure 9 As shown, according to some embodiments of the present application, the number of the second parts 1122 is multiple, wherein some of the second parts 1122 are arranged between the second side wall 122 and the electrode assembly 130, and some of the second parts 1122 are arranged between the first side wall 121 and the electrode assembly 130.

[0112] The battery cell 100 is a prismatic battery. The housing 120 includes four sidewalls. There are multiple second portions 1122 . The fluid outlets 114 of different second portions 1122 are used to introduce electrolyte between different sidewalls and the electrode assembly 130 . The number of second portions 1122 can be determined based on demand, for example, two or four.

[0113] In some embodiments, the four side surfaces of the first part 1121 are respectively connected to the second part 1122, and the second part 1122 is arranged between each side wall of the shell 120 and the electrode assembly 130, that is, the two second parts 1122 are respectively located between the two first side walls 121 and the electrode assembly 130, and the remaining two second parts 1122 are respectively located between the two second side walls 122 and the electrode assembly 130.

[0114] In some embodiments, two adjacent side surfaces of the first portion 1121 are respectively connected to at least one second portion 1122, wherein at least one second portion 1122 is located between one of the first side walls 121 and the electrode assembly 130, and at least one second portion 1122 is located between one of the second side walls 122 and the electrode assembly 130.

[0115] By respectively arranging the second portion 1122 between the second side wall 122 and the electrode assembly 130 and between the first side wall 121 and the electrode assembly 130, the electrolyte flows into the bottom of the shell 120 from different positions, thereby improving the wetting efficiency and uniformity of the electrode assembly 130.

[0116] like Figure 10 As shown, according to some embodiments of the present application, the first part 1121 is provided with a first opening 1124 connected to the second part 1122, and a second opening 1125 staggered with the first opening 1124; wherein, the second opening 1125 is located on the side of the first part 1121 opposite to the side wall, and in a plane perpendicular to the thickness direction of the cover plate 111, the orthographic projection of the second opening 1125 is located between the orthographic projection of the electrode assembly 130 and the orthographic projection of the side wall.

[0117] The first opening 1124 is connected to the flow channel of the second portion 1122 and is used to transfer part of the electrolyte in the first portion 1121 to the flow channel of the second portion 1122. The structural shape of the first opening 1124 can be any shape as long as it can adapt to the flow channel of the second portion 1122, for example, it can be circular, elliptical, polygonal, etc.

[0118] The second opening 1125 is connected to the housing 120 so as to directly transfer the electrolyte in the first portion 1121 to the housing 120. The second opening 1125 can be in any shape, such as circular, elliptical, polygonal, etc.

[0119] There are multiple first openings 1124 and multiple second openings 1125 , which are staggered with each other.

[0120] The second opening 1125 may be located on the side of the first portion 1121 facing the side wall, including the side facing the first side wall 121 and the side facing the second side wall 122 ; or may be located on the bottom surface of the first portion 1121 facing the bottom wall.

[0121] In a plane perpendicular to the thickness direction of the cover plate 111, the orthographic projection of the second opening 1125 is located between the orthographic projection of the electrode assembly 130 and the orthographic projection of the side wall, which means that the electrolyte flowing out of the second opening 1125 can directly enter the gap between the electrode assembly 130 and the side wall of the shell without directly impacting the top of the electrode assembly 130.

[0122] By additionally providing a second opening 1125 in communication with the housing cavity of the shell 120 on the first portion 1121 , rapid electrolyte diversion can be assisted, injection time can be shortened, and the efficiency of the electrode assembly 130 wetting can be improved.

[0123] like Figure 10 As shown, according to some embodiments of the present application, the second opening 1125 is located on a side surface of the first portion 1121 facing the second sidewall 122 .

[0124] In some embodiments, a second portion 1122 is arranged between the first side wall 121 and the electrode assembly 130, and the second portion 1122 is provided with a fluid outlet 114. The fluid outlet 114 at this position helps the electrolyte to flow quickly along the wall surface of the first side wall 121 to the bottom of the shell 120; a second opening 1125 is provided on the side of the first portion 1121 facing the second side wall 122. The second opening 1125 at this position can provide electrolyte to the gap between the second side wall 122 and the electrode assembly 130, and there is no need to arrange a physical structure between the second side wall 122 and the electrode assembly 130, which can reduce the occupation of the internal layout space of the shell, which is beneficial to improving the volume energy density of the battery cell 100.

[0125] In some embodiments, the first portion 1121 is provided with second openings 1125 on both sides facing the two second sidewalls 122 .

[0126] In some embodiments, the second openings 1125 are spaced apart in the first portion 1121 along the length direction of the cover plate 111 .

[0127] By setting a second opening 1125 on the side opposite to the first part 1121 and the second side wall 122, the electrolyte can be injected from between the second side wall 122 and the electrode assembly 130, so as to achieve the purpose of injecting electrolyte between each side wall and the electrode assembly 130, thereby improving the uniformity of the wetting of the electrode assembly 130; at the same time, the design of the second opening 1125 can reduce the occupation of the internal space of the shell 120 by the physical structure, which is beneficial to improving the volume energy density of the battery cell 100.

[0128] like Figure 11 As shown, according to some embodiments of the present application, the first part 1121 is provided with a first flow channel 115 connected to the fluid inlet 113, and the second part 1122 is provided with a second flow channel 116 connected to the first flow channel 115 and the fluid outlet 114, the first flow channel 115 includes a gathering area 1151 and a guide area 1152, the gathering area 1151 is arranged opposite to the fluid inlet 113, and the positive projection area of ​​the gathering area 1151 on the surface of the cover plate 111 facing the electrode assembly 130 is larger than the positive projection area of ​​the fluid inlet 113 on the surface of the cover plate 111 facing the electrode assembly 130, and the guide area 1152 connects the gathering area 1151 with the second flow channel 116.

[0129] The first portion 1121 is provided with a first flow channel 115, and the second portion 1122 is provided with a second flow channel 116. The first flow channel 115 and the second flow channel 116 are connected. The electrolyte enters the first flow channel 115 through the fluid inlet 113 and then passes through the second flow channel 116 and is discharged from the fluid outlet 114. The structures of the first flow channel 115 and the second flow channel 116 are not limited.

[0130] In some embodiments, the first flow channel 115 includes a collection area 1151 and a diversion area 1152. The collection area 1151 is a transfer structure for collecting and storing electrolyte entering from the fluid inlet 113 and diverting it through the diversion area 1152. For example, the collection area 1151 is a sink structure inside the insulating member 112, and the sink structure can be a circular sink, a square sink, etc.

[0131] The cover plate 111 has a surface facing the electrode assembly 130 , ie, a lower surface of the cover plate 111 .

[0132] The collection area 1151 and the fluid inlet 113 correspond to each other in position, and in the projection of the inner side of the cover plate 111, the area of ​​the collection area 1151 is larger than the area of ​​the fluid inlet 113. In this way, most of the electrolyte injected into the fluid inlet 113 will directly enter the collection area 1151 and will not diffuse at will, so that the electrolyte will flow in an orderly manner according to the flow channel design.

[0133] The diversion area 1152 is a flow channel structure for guiding the electrolyte stored in the collection area 1151 to the second flow channel 116. For example, the diversion area 1152 and the collection area 1151 use the same trough-shaped diversion structure. The number and structure of the diversion structures are not limited, and the number can be 2, 4, 6, etc. The cross-sectional shape of the diversion area 1152 can be any shape, such as an arc, an ellipse, a polygon, etc.

[0134] By designing the first flow channel 115 into a structure of a collection area 1151 and a guide area 1152, the electrolyte can be buffered and the flow rate of the electrolyte can be controlled, thereby improving the flexibility and uniformity of the electrolyte flow.

[0135] like Figure 12 As shown, according to some embodiments of the present application, the flow channel width of the guide area 1152 gradually increases along the direction from the converging area 1151 to the second flow channel 116 .

[0136] The flow channel 1152 can be a straight channel, or a curved channel such as an arc or a wavy line. The channel width of the flow channel 1152 refers to the width of the flow channel on a horizontal plane perpendicular to the direction in which the flow channel extends. The direction in which the flow channel of the flow channel 1152 extends is the same as the flow direction of the fluid in the flow channel.

[0137] One end of the flow diversion area 1152 is connected to the collection area 1151, and the other end of the flow diversion area 1152 is connected to the fluid outlet 114. The flow channel width of the flow diversion area 1152 gradually increases from the collection area 1151 to the fluid outlet 114. It is understood that the gradual increase here can be a continuous increase or a step-by-step increase, and this application does not limit this.

[0138] By adopting a structural design in which the width of the guide area 1152 gradually increases along the flow direction, on the one hand, the flow coverage range of the electrolyte entering the second part 1122 is further improved, thereby improving the uniformity of electrolyte injection; on the other hand, the flow velocity of the electrolyte decreases due to the increase in the flow channel width, thereby reducing the flow velocity of the electrolyte entering the second part 1122 and reducing pressure loss.

[0139] like Figure 12 As shown, according to some embodiments of the present application, the number of the guide areas 1152 and the number of the second flow channels 116 are both multiple; the guide areas 1152 are connected to the second flow channels 116 in a one-to-one correspondence.

[0140] The guide area 1152 is used to guide the electrolyte stored in the collection area 1151 to the second flow channel 116. One end of each of the guide areas 1152 is connected to the collection area 1151, and the other end of each of the guide areas 1152 is connected to a different second flow channel 116. The number of guide areas 1152 and the number of second flow channels 116 can be determined according to actual conditions, for example, two, four, etc.

[0141] In some embodiments, the battery cell 100 is a square-shell battery, and both ends of the first portion 1121 in the length direction are connected to a second portion 1122 . The first portion 1121 includes two guide areas 1152 , and each guide area 1152 is connected to a second flow channel 116 .

[0142] In some embodiments, the battery cell 100 is a square shell battery, and both ends of the first part 1121 in the length direction and the width direction are respectively connected to a second part 1122. The first part 1121 includes four guide areas 1152, and each guide area 1152 is connected to a second flow channel 116.

[0143] By providing a plurality of correspondingly connected guide areas 1152 and second flow channels 116 , the electrolyte can be injected into the shell 120 from different positions, thereby improving the uniformity and stability of injection at different positions. At the same time, the speed of electrolyte diversion can be accelerated, thereby improving the wetting efficiency of the electrode assembly 130 .

[0144] like Figure 12 As shown, according to some embodiments of the present application, the second portion 1122 is a hollow tubular structure.

[0145] A continuous tubular flow channel is formed within the second portion 1122. One end of the tubular flow channel communicates with the channel of the first portion 1121, and the other end of the tubular flow channel communicates with the fluid outlet 114. The tubular flow channel may include a straight channel, a curved channel, or any other channel capable of conveying electrolyte to the fluid outlet 114.

[0146] In some embodiments, the second portion 1122 is a connecting tube, which is made of insulating material. The connecting tube can be a hard tube or a soft tube.

[0147] By utilizing the guide channel formed by the hollow tubular structure, the electrolyte can directly and quickly reach the gap between the electrode assembly 130 and the side wall, thereby improving the injection efficiency. At the same time, the hollow tubular structure is simple and easy to manufacture and install.

[0148] According to some embodiments of the present application, the second portion 1122 is a flat-mouth tube, and the extension direction of the long side of the cross section of the second portion 1122 is parallel to the surface of the side wall.

[0149] A flat-mouth tube refers to a fluid conduit with a relatively large aspect ratio in its cross-section. One end of the flat-mouth tube communicates with the passageway of the first portion 1121, and the other end communicates with the fluid outlet 114. In some embodiments, the cross-section of the flat-mouth tube can be rectangular or elliptical, and the aspect ratio can be greater than or equal to 5, for example, 5, 8, 10, 12, 15, 20, and so on.

[0150] The extension direction of the long side of the cross section is parallel to the surface of the side wall. It can be understood that the plane where the two opposite side surfaces with larger areas in the second part 1122 are located is parallel to the surface of the side wall, and one of the two opposite side surfaces with larger areas in the second part 1122 close to the side wall can be in contact with the side wall or there can be a gap between the side wall and the side wall.

[0151] In some embodiments, multiple sub-flow channels may also be arranged inside the flat-mouth tube.

[0152] By adopting a flat-mouth tube structural design, the space occupied by the second part 1122 between the electrode assembly 130 and the side wall can be reduced, making it easier for the second part 1122 to be arranged between the electrode assembly 130 and the side wall; at the same time, the area relative to the second part 1122 and the first side wall 121 is increased, thereby improving space utilization and thus improving the uniformity of infiltration.

[0153] According to some embodiments of the present application, the first portion 1121 and the second portion 1122 are integrally formed.

[0154] The first part 1121 and the second part 1122 are manufactured as a whole through an integrated molding process. This process means that the entire part is molded in a single mold at one time, eliminating the need for separate manufacturing and subsequent assembly of multiple parts.

[0155] It should be noted that the flow channel inside the first portion 1121 and the flow channel inside the second portion 1122 are connected to each other when they are integrally formed.

[0156] By integrally forming the first portion 1121 and the second portion 1122 , the number of installation steps can be reduced during the installation process, while also facilitating mass production and reducing production costs.

[0157] like Figure 5 As shown, according to some embodiments of the present application, the cover plate 111 is further provided with a first pressure relief hole 1114 , the insulating member 112 is provided with a second pressure relief hole 1123 , and the first pressure relief hole 1114 is communicated with the second pressure relief hole 1123 .

[0158] The first pressure relief hole 1114 and the second pressure relief hole 1123 are structures for discharging gas from the housing 120. The first pressure relief hole 1114 and the second pressure relief hole 1123 may be in a circular, square, or any other shape that can discharge gas.

[0159] In some embodiments, a mounting groove 1112 is further provided on the cover plate 111 . The mounting groove 1112 is used to assist in connection with an external liquid injection device. The liquid injection hole 1113 and the first pressure relief hole 1114 are arranged in the mounting groove 1112 .

[0160] In some embodiments, the second pressure relief hole 1123 on the insulating member 112 is provided corresponding to the first pressure relief hole 1114 on the cover plate 111 .

[0161] In some embodiments, the cover plate 111 is further provided with an explosion-proof through hole 1115 for installing an explosion-proof valve, and a pole hole 1116 for installing a pole.

[0162] By respectively providing the first pressure relief hole 1114 and the second pressure relief hole 1123 and connecting the first pressure relief hole 1114 with the second pressure relief hole 1123 , it is helpful to discharge the gas inside the shell 120 , avoid liquid sealing, and improve the uniformity of the infiltration.

[0163] An embodiment of the present application provides a battery device 10 , which includes the battery cell 100 in the above embodiment.

[0164] The battery device 10 of this embodiment adopts the battery cell 100 of the above embodiment and thus has the same technical effects, which will not be described in detail here.

[0165] An embodiment of the present application provides an electrical device, which includes the battery device 10 in the above embodiment, and the battery device 10 is used to provide electrical energy.

[0166] The electric device of this embodiment adopts the battery device 10 of the above embodiment and thus has the same technical effects, which will not be described in detail here.

[0167] An embodiment of the present application provides an energy storage device 20 , which includes a plurality of battery cells 100 or battery devices 10 in the above embodiments. The battery cells 100 or battery devices 10 are used to store or provide electrical energy.

[0168] The energy storage device 20 of this embodiment adopts the battery cell 100 or the battery device 10 in the above embodiments, and thus has the same technical effects, which will not be described in detail here.

[0169] An embodiment of the present application provides an energy storage system, which includes a power conversion device and the energy storage device 20 in the above embodiment. The power conversion device is used to electrically connect the power generation device and the energy storage device 20.

[0170] The energy storage system of this embodiment has the same technical effects as the energy storage device 20 in the above embodiment, and thus will not be described in detail here.

[0171] An embodiment of the present application provides a charging network, which includes a charging pile 50 and the energy storage device 20 in the above embodiment or the energy storage system in the above embodiment, and the energy storage device 20 is used to provide electrical energy to the charging pile 50.

[0172] The present application will be further described below with reference to a specific embodiment. Figure 10 shown.

[0173] The battery cell 100 includes a cap assembly 110 , a case 120 , and an electrode assembly 130 . The cap assembly 110 includes a cap plate 111 and an insulating member 112 .

[0174] The shell 120 includes two first side walls 121 arranged opposite to each other along the length direction of the cover plate 111, and two second side walls 122 arranged opposite to each other along the width direction of the cover plate 111; the area of ​​the first side wall 121 is smaller than the area of ​​the second side wall 122, and the two first side walls 121, the two second side walls 122 and the bottom wall form a accommodating cavity with an opening, which is used to accommodate the electrode assembly 130.

[0175] The cover plate 111 covers the opening of the housing 120 to seal the accommodating cavity. The cover plate 111 is provided with a liquid injection hole 1113 and a first pressure relief hole 1114 .

[0176] The insulating member 112 is disposed between the cover plate 111 and the electrode assembly 130 and includes an integrally formed first portion 1121 and a second portion 1122 .

[0177] The first portion 1121 is connected to the cover plate 111 and is provided with a fluid inlet 113 facing the liquid injection hole 1113 and a second pressure relief hole 1123 facing the first pressure relief hole 1114 .

[0178] The first portion 1121 further defines a first opening 1124 , a second opening 1125 , and a first flow channel 115 . The first flow channel 115 guides the electrolyte entering through the fluid inlet 113 to the first opening 1124 and the second opening 1125 .

[0179] The second opening 1125 is located on the side of the first portion 1121 facing the second sidewall 122 , and in a plane perpendicular to the thickness direction of the cover plate 111 , the orthographic projection of the second opening 1125 is located between the orthographic projection of the electrode assembly 130 and the orthographic projection of the sidewall.

[0180] The second portion 1122 is connected to the first portion 1121 and is located on a side of the first portion 1121 away from the cover plate 111 . In a plane perpendicular to the thickness direction of the cover plate 111 , the orthographic projection of the second portion 1122 is completely offset from the orthographic projection of the electrode assembly 130 .

[0181] The second portion 1122 is a hollow tubular structure including a second flow channel 116 communicating with the first opening 1124 and the fluid outlet 114 . The second flow channel 116 guides the electrolyte entering through the first opening 1124 to the fluid outlet 114 .

[0182] The portion of the second portion 1122 where the fluid outlet 114 is located is located in the gap between the electrode assembly 130 and the first sidewall 121 .

[0183] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: electrode assembly, a housing, forming a housing cavity with an opening, the housing cavity being used to accommodate the electrode assembly, the housing including a side wall adjacent to the opening; as well as A top cover assembly, comprising a cover plate and an insulating member, wherein the cover plate covers the opening of the shell to close the accommodating cavity, and the cover plate is provided with a liquid injection hole; the insulating member is located on a side of the cover plate facing the electrode assembly; In which, the insulating member includes a fluid inlet and a fluid outlet connected to the fluid inlet, the fluid inlet is used to receive the electrolyte injected from the injection hole, and the fluid outlet is located between the electrode assembly and the side wall to provide the electrolyte to the gap between the electrode assembly and the side wall.

2. The battery cell according to claim 1, wherein: The insulating member comprises: a first portion connected to the cover plate, wherein the fluid inlet is located in the first portion and is arranged opposite to the liquid injection hole; a second portion connected to the first portion and located on a side of the first portion away from the cover plate, wherein the fluid outlet is located in the second portion; The portion of the second part where the fluid outlet is provided is located in the gap between the electrode assembly and the side wall.

3. The battery cell according to claim 2, characterized in that: There are multiple second parts, and the multiple second parts are spaced apart around the electrode assembly.

4. The battery cell according to claim 2, characterized in that: In a plane perpendicular to the thickness direction of the cover plate, the orthographic projection of the second portion is completely offset from the orthographic projection of the electrode assembly.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The side walls include two first side walls arranged opposite to each other along the length direction of the cover plate, and two second side walls arranged opposite to each other along the width direction of the cover plate; the area of ​​the first side walls is smaller than the area of ​​the second side walls; Wherein, the portion of the second portion where the fluid outlet is provided is arranged between the first side wall and the electrode assembly.

6. The battery cell according to claim 5, characterized in that There are multiple second parts, wherein some of the second parts are arranged between the second side wall and the electrode assembly, and some of the second parts are arranged between the first side wall and the electrode assembly.

7. The battery cell according to claim 5, characterized in that The first portion is provided with a first opening communicating with the second portion, and a second opening staggered with the first opening; The second opening is located on the side of the first portion facing the side wall, and in a plane perpendicular to the thickness direction of the cover plate, the orthographic projection of the second opening is located between the orthographic projection of the electrode assembly and the orthographic projection of the side wall.

8. The battery cell according to claim 7, characterized in that The second opening is located on a side of the first portion facing the second side wall.

9. The battery cell according to any one of claims 2 to 4, characterized in that: The first portion is provided with a first flow channel communicating with the fluid inlet, and the second portion is provided with a second flow channel communicating with the first flow channel and the fluid outlet, wherein the first flow channel includes: a collecting area, arranged opposite to the fluid inlet, wherein the orthographic projection area of ​​the collecting area on the surface of the cover plate facing the electrode assembly is larger than the orthographic projection area of ​​the fluid inlet on the surface of the cover plate facing the electrode assembly; and The flow guide area is connected with the collecting area and the second flow channel.

10. The battery cell according to claim 9, characterized in that Along the direction from the converging area to the second flow channel, the flow channel width of the guide area gradually increases.

11. The battery cell according to claim 9, characterized in that The number of the guide areas and the number of the second flow channels are both plural; the guide areas are connected to the second flow channels in a one-to-one correspondence.

12. The battery cell according to any one of claims 2 to 4, characterized in that: The second part is a hollow tubular structure.

13. The battery cell according to any one of claims 2 to 4, characterized in that: The second portion is a flat-mouth tube, and an extending direction of a long side of a cross section of the second portion is parallel to a surface of the side wall.

14. The battery cell according to any one of claims 2 to 4, characterized in that: The first portion and the second portion are integrally formed.

15. The battery cell according to any one of claims 1 to 4, characterized in that: The cover plate is further provided with a first pressure relief hole, and the insulating member is provided with a second pressure relief hole, and the first pressure relief hole is communicated with the second pressure relief hole.

16. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 15.

17. An electrical device, characterized in that: The battery device according to claim 16 is used to provide electrical energy.

18. An energy storage device, characterized in that: The battery cell comprises a plurality of battery cells according to any one of claims 1 to 15 or a plurality of battery devices according to claim 16, wherein the battery cells or the battery devices are used to store or provide electrical energy.

19. An energy storage system, characterized in that: It comprises a power conversion device and the energy storage device as claimed in claim 18, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

20. A charging network, characterized in that: It comprises a charging pile and the energy storage device according to claim 18 or the energy storage system according to claim 19, wherein the energy storage device or the energy storage system is used to provide electrical energy for the charging pile.

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