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

Abstract

The present application is applicable to the field of batteries. Provided are a battery device, an energy storage device, an energy storage system and a charging network. The battery device (100) comprises a battery cell assembly (20). The battery cell assembly (20) comprises a plurality of battery cells (21), wherein the plurality of battery cells (21) are arranged in sequence in a first direction, each battery cell (21) comprises a first side wall (2111), the first side wall (2111) is the wall with the largest area among all the outer walls of the battery cell (21), and the first side walls (2111) of the plurality of battery cells (21) are arranged in sequence in the first direction; a buffer member (23) which comprises one or more buffer pads (231), each buffer pad (231) being arranged between two adjacent battery cells (21); and a heat-insulating member (24) which comprises one or more heat-insulating pads (241), each heat-insulating pad (241) being arranged between two adjacent battery cells (21). The technical solution provided in the embodiments of the present application can improve the reliability of an energy storage device.

Description

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

[0001] This application claims priority to the Chinese patent application No. 202422946071.2, filed on November 29, 2024, and entitled "Battery device, energy storage device, energy storage system and charging network", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of battery, in particular to a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0003] With the rapid development of science and technology, electric energy has become an indispensable energy in people's production and life. In order to improve the smoothness of electric energy supply and realize the normal operation of production and life, it is necessary to use energy storage devices. As an electric energy storage device, the energy storage device can store electric energy in the energy storage device through charging or discharging, or supply electric energy stored in the energy storage device to an electric device. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation and energy storage power station fields.

[0004] In the development of energy storage devices, in addition to improving the performance of energy storage devices, how to improve the reliability of energy storage devices is a continuous improvement technical problem in energy storage technology. SUMMARY

[0005] Therefore, the embodiments of the present application provide a battery device, an energy storage device, an energy storage system and a charging network, which can improve the reliability of the energy storage device.

[0006] The embodiments of the first aspect of the present application provide a battery device, comprising a battery monomer assembly, the battery monomer assembly comprising a plurality of battery monomers, the plurality of battery monomers being arranged in sequence along a first direction, the battery monomer comprising a first side wall, the first side wall being the wall with the largest area among all the outer walls of the battery monomer, the first side walls of the plurality of battery monomers being arranged in sequence along the first direction; a buffer member comprising one or more buffer pads, the buffer pad being arranged between two adjacent battery monomers; a heat insulation member comprising one or more heat insulation pads, the heat insulation pad being arranged between two adjacent battery monomers.

[0007] The battery device provided by the embodiment of the present application comprises a battery monomer assembly, the battery monomer assembly comprises a plurality of battery monomers, a buffer component and a heat insulation component, the buffer component comprises one or more buffer pads, the buffer pad can play a buffering role, the problem of poor material contact, reduced charging and discharging efficiency and overall performance caused by excessive expansion force of the battery monomer is reduced, and the mechanical structure stability and reliability of the battery device are improved; the heat insulation component comprises one or more heat insulation pads, the heat insulation pad can play a heat insulation role, the risk of heat diffusion between the battery monomers on both sides of the heat insulation pad is reduced, and the reliability of the battery device is improved. The first side wall of the battery monomer is arranged in sequence along the first direction, the buffer pad and the heat insulation pad are opposite to the first side wall, and the buffer pad and the heat insulation pad have good buffering and heat insulation effects. The buffer pad and the heat insulation pad can be arranged in a certain order, which can not only reduce the heat conduction between the battery monomers and reduce the risk of thermal runaway diffusion, but also reduce the influence of expansion and contraction of the battery monomer assembly caused by respiration on the mechanical assembly.

[0008] In some embodiments, a buffer pad and / or a heat insulation pad are arranged between every two adjacent battery monomers.

[0009] By adopting the above technical solution, every two adjacent battery monomers are separated by a buffer pad and / or a heat insulation pad, so as to improve the reliability of the battery device.

[0010] In some embodiments, only one of the buffer pad and the heat insulation pad is arranged between every two adjacent battery monomers.

[0011] By adopting the above technical solution, the reliability of the battery device can be improved without affecting the energy density of the battery device.

[0012] In some embodiments, at least one heat insulation pad is arranged at a middle position of the battery monomer assembly along the first direction.

[0013] By adopting the above technical solution, the heat insulation pad limits the heat to one side of the battery monomer assembly, better reducing the influence of the battery monomer with thermal runaway on other battery monomers, and limiting the heat to one side of the battery monomer assembly, better reducing the risk of heat diffusion.

[0014] In some embodiments, when the number of battery monomers is odd, the battery monomers on both sides of the middle battery monomer are respectively attached to one heat insulation pad; when the number of battery monomers is even, the two middle battery monomers are separated by one heat insulation pad.

[0015] By adopting the above technical solution, the heat insulation pad at the middle of the battery monomer assembly can divide the battery monomer assembly into two battery units, so as to block the heat transfer between the battery monomers on both sides, and reduce the risk of heat diffusion and thermal runaway of the battery monomer assembly.

[0016] In some embodiments, the heat insulation component includes a plurality of heat insulation pads, the arrangement of which is symmetrical about the center of the battery cell assembly.

[0017] By adopting the above technical solution, the heat insulation component can divide the battery cell assembly into multiple battery cells, reducing the risk of heat diffusion between multiple battery cells; due to the symmetrical arrangement of multiple heat insulation pads, the battery cell assembly has a good thermal insulation effect on both sides along the first direction.

[0018] In some embodiments, there are multiple buffer pads, and the multiple buffer pads are arranged symmetrically about the center position of the battery cell assembly.

[0019] By adopting the above technical solutions, the heat insulation pad can reduce the heat conduction between battery cells, and the thermal runaway of a battery cell is less likely to spread to adjacent battery cells. The buffer pad can meet the impact of the expansion and contraction of the battery cell assembly caused by breathing during charging and discharging. In this way, the battery cell assembly has both good thermal isolation and buffering effects, and the internal stress of the battery cell assembly is more balanced.

[0020] In some embodiments, cushioning pads and heat insulation pads are alternately arranged on one or both sides of the center location of the battery cell assembly.

[0021] By adopting the above technical solutions, the battery cell module has both good thermal isolation and buffering effects, and the internal stress of the battery cell module is relatively balanced.

[0022] In some embodiments, the buffer pad has a through hole that extends through the buffer pad along a first direction and corresponds to the center of the battery cell.

[0023] By adopting the above technical solution, the buffer pad has through holes corresponding to the center of the battery cell, which provides space for the expansion of the battery cell during use and can further reduce the negative impact of the battery cell expansion force.

[0024] In some embodiments, the buffer pad includes two opposing and spaced-apart semi-frames, which are respectively fixed to the battery cell and form a through hole.

[0025] By adopting the above technical solution, it is possible to support the battery cell using a semi-enclosed frame and provide expansion space for the battery cell through the through holes between the semi-enclosed frames.

[0026] In some embodiments, the heat insulation pad includes a heat insulation body and a reinforcing member, the reinforcing member being connected to at least one side of the heat insulation body, the strength of the reinforcing member being greater than the strength of the heat insulation body; the two sides of the reinforcing member respectively abut against two adjacent battery cells.

[0027] By adopting the above technical solution, the risk of reduced insulation effect due to excessive compression of the insulation body can be reduced, thus improving the reliability of the insulation pad.

[0028] In some embodiments, the cushioning pad is bonded to the first sidewall of the adjacent battery cell, and / or, the heat insulation pad is bonded to the first sidewall of the adjacent battery cell.

[0029] By adopting the above technical solution, the buffer pad and / or heat insulation pad can be stably attached to the first sidewall. The first sidewall of the battery cell generates a large amount of heat and expands, and the buffer pad and heat insulation pad can provide better protection for the battery cell assembly.

[0030] In some embodiments, the heat insulation pad completely covers the first sidewall.

[0031] By adopting the above technical solution, the heat insulation pad can completely separate two adjacent battery cells, reducing heat transfer between adjacent battery cells.

[0032] In some embodiments, the thickness of the cushioning pad is 1 mm to 5 mm; and / or, the thickness of the heat insulation pad is 1 mm to 5 mm.

[0033] By adopting the above technical solution, the buffer pad has good buffering performance, the heat insulation pad has good heat insulation performance, and the energy density of the battery device will not be affected by the excessive thickness of the buffer pad and the heat insulation pad.

[0034] In some embodiments, the battery cell assembly further includes two end plates and a fixing strap. Along the first direction, a plurality of battery cells, the buffer member, and the heat insulation member are disposed between the two end plates; the fixing strap surrounds the outer periphery of the two end plates.

[0035] By adopting the above technical solution, under the constraint of the end plate and fixing strap, the heat insulation pad and buffer pad can be tightly attached to the battery cell, and the structural stability of the battery cell assembly is good.

[0036] An embodiment of the second aspect of this application provides an energy storage device including a plurality of battery devices as described in the first aspect.

[0037] An embodiment of the third aspect of this application provides an energy storage system including a power conversion device and an energy storage device as provided in the second aspect, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0038] An embodiment of the fourth aspect of this application proposes a charging network including a charging pile and an energy storage device, such as the energy storage device of the second aspect or the energy storage system of the third aspect, the energy storage device being used to provide electrical energy to the charging pile.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0042] Figure 2 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of this application;

[0043] Figure 3 is a perspective view of a battery cell assembly provided in some embodiments of this application;

[0044] Figure 4 is one of the structural schematic diagrams of a battery cell assembly provided in some embodiments of this application;

[0045] Figure 5 is a second schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0046] Figure 6 is a third schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0047] Figure 7 is a fourth schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0048] Figure 8 is a schematic diagram of the structure of the buffer pad provided in some embodiments of this application;

[0049] Figure 9 is a schematic diagram of the structure of the heat insulation pad provided in some embodiments of this application.

[0050] The markings in the diagram represent the following: 100, Battery assembly; 10, Housing; 11, First housing; 12, Second housing; 20, Battery cell assembly; 20a, Central cell; 21, Battery cell; 211, Housing; 2111, First side wall; 2112, Second side wall; 212, End cap; 213, Electrode assembly; 214, Electrode terminal; 215, Pressure relief mechanism; 21a, Central cell; 23, Buffer component; 231, Buffer pad; 2311, Through hole; 2312, Semi-enclosed frame; 24, Heat insulation component; 241, Heat insulation pad; 2411, Heat insulation body; 2412, Reinforcing member; 25, End plate; 26, Fixing strap. Embodiments of the present invention

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and claims, book and foregoing description of the drawings, are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0059] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0060] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0061] In the development of energy storage devices, in addition to improving the performance of energy storage devices, how to improve the reliability of energy storage devices is a technical problem that needs continuous improvement in energy storage technology.

[0062] Energy storage devices consist of multiple battery cells. During charging and discharging, these cells generate heat, especially at high power levels or under high ambient temperatures. The batteries continuously produce significant amounts of heat that cannot be released quickly, leading to a continuous rise in temperature and a risk of thermal runaway, thus impacting the reliability of the battery system. Simultaneously, the stress changes within the battery modules during charging and discharging due to the "breathing" effect. Excessive expansion force in individual battery cells can cause loosening of internal materials and poor contact, reducing the charging and discharging efficiency and overall performance of the battery system. This can even lead to deformation or cracking of mechanical components such as the casing and support structures, affecting the stability of the mechanical structure and ultimately impacting the reliability of both the battery system and the energy storage device.

[0063] In view of this, embodiments of this application provide a battery device, including a battery cell assembly. The battery cell assembly includes multiple battery cells, a buffer member, and a heat insulation member. The multiple battery cells are arranged sequentially along a first direction. Each battery cell includes a first sidewall, which is the wall with the largest area among all the outer walls of the battery cell. The first sidewalls of the multiple battery cells are arranged sequentially along the first direction. The buffer member includes one or more buffer pads, which are disposed between two adjacent battery cells. The heat insulation member includes one or more heat insulation pads, which are disposed between two adjacent battery cells.

[0064] In the aforementioned battery device, the heat insulation pad can separate the battery cells and reduce heat transfer between adjacent battery cells, making it less likely for heat to diffuse between battery cells and improving the reliability of the battery device. At the same time, the buffer pad can provide space for the battery cells to expand and deform, reducing the problem of poor contact caused by excessive expansion force of battery cells, reducing the charging and discharging efficiency and overall performance of the battery device, and improving the mechanical stability and reliability of the battery device.

[0065] Referring to Figures 1 and 2, Figure 1 is an exploded structural diagram of a battery device 100 provided in some embodiments of this application, and Figure 2 is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application.

[0066] The battery apparatus 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0067] In some embodiments, the battery cell assembly 20 is typically formed by arranging multiple battery cells 21; as an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 into an independent module. As an example, a battery module can be formed by binding multiple battery cells 21 together with fixing straps.

[0068] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed within the housing 10.

[0069] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10. The housing 10 refers to the structure in the battery device 100 that provides a fixing base for the battery cell assembly 20. The housing 10 can be prismatic, cylindrical, or other shapes; the material of the housing 10 can include metal, plastic, or other materials.

[0070] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0071] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together, forming a closed receiving space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0072] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms a closed receiving space to accommodate the battery cell assembly 20.

[0073] In some embodiments, battery device 100 refers to an energy storage device, which includes a housing 10, and at least one side of the housing 10 has a door. The energy storage device includes energy storage containers, energy storage cabinets, etc.

[0074] Please refer to Figure 2. The battery cell 21 is the smallest unit that makes up the battery device 100. The battery cell 21 includes a housing 211, an end cap 212, an electrode assembly 213, and other functional components.

[0075] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 21 to have higher structural strength and improved reliability. Functional components such as electrode terminals 214 and pressure relief mechanism 215 can be provided on end cap 212. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 for outputting or inputting electrical energy to battery cell 21. In some embodiments, pressure relief mechanism 215 is used to release internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 212 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 also be provided on the inner side of the end cap 212 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0076] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 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 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0077] Electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The casing 211 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is 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 the electrode assembly 213, 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 214 to form a current loop.

[0078] In some embodiments, a pressure relief mechanism 215 is provided on one side of the battery cell 21. The pressure relief mechanism 215 is an element or component that is actuated to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. The threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 21. The internal pressure of the battery cell 21 is the pressure inside the casing 211. The pressure relief mechanism 215 may take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically adopt a pressure-sensitive element or structure. That is, when the internal pressure of the battery cell 21 reaches the predetermined threshold, the pressure relief mechanism 215 performs an action or a weak part provided in the pressure relief mechanism 215 ruptures, thereby forming an opening or channel for releasing internal pressure.

[0079] Actuation of the pressure relief mechanism 215 refers to the action or activation of the pressure relief mechanism 215 to a certain state, thereby releasing the internal pressure of the battery cell 21. The action of the pressure relief mechanism 215 may include, but is not limited to, at least a portion of the pressure relief mechanism 215 rupturing, breaking, tearing, or opening, etc. When the pressure relief mechanism 215 is actuated, the high-temperature, high-pressure substances inside the battery cell 21 are discharged outwards from the actuated part as waste. In this way, the battery cell 21 can be depressurized under controllable pressure, thereby avoiding potentially more serious accidents. The waste from the battery cell 21 mentioned in this application includes, but is not limited to, electrolyte, dissolved or broken positive and negative electrode plates, fragments of the separator, high-temperature, high-pressure gases generated by the reaction, flames, etc.

[0080] In a first aspect, embodiments of this application provide a battery device 100, which includes a battery cell assembly 20. Referring to Figures 2 and 3, Figure 3 is a schematic structural diagram of the battery cell assembly 20 provided in some embodiments of this application. The battery cell assembly 20 includes a plurality of battery cells 21, a buffer member 23, and a heat insulation member 24. The plurality of battery cells 21 are arranged sequentially along a first direction X. Each battery cell 21 includes a first sidewall 2111, which is the wall with the largest area among all the outer walls of the battery cell 21. The first sidewalls 2111 of the plurality of battery cells 21 are arranged sequentially along the first direction X. The buffer member 23 includes one or more buffer pads 231, which are disposed between two adjacent battery cells 21. The heat insulation member 24 includes one or more heat insulation pads 241, which are disposed between two adjacent battery cells 21.

[0081] The battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially along a first direction X, which can be the length direction of the housing 10. In other embodiments, the first direction X can also be the width direction of the housing 10, or a direction that intersects both the length and width directions of the housing 10. The battery device 100 may include one or more battery cell assemblies 20. When there are multiple battery cell assemblies 20, the multiple battery cell assemblies can be arranged along a second direction Y, or simultaneously along the first direction X and the second direction Y, where the second direction Y intersects the first direction X.

[0082] The battery cell 21 includes a first sidewall 2111, which is the wall with the largest area among all the outer walls of the battery cell 21, and can be referred to as the large surface of the battery cell 21. During the use of the battery cell 21, the heat generation and expansion of the first sidewall 2111 are greater than those of other parts of the battery cell 21. Optionally, the battery cell 21 includes a housing 211 and an end cap 212. The housing 211 includes a first sidewall 2111 and a second sidewall 2112 connected together, and the area of ​​the first sidewall 2111 is larger than the area of ​​the second sidewall 2112.

[0083] The buffer member 23 includes one or more buffer pads 231, which are disposed between two adjacent battery cells 21 arranged along the first direction X to separate the two battery cells 21. The buffer pads 231 play a buffering role and can be compressed and deformed to absorb the expansion force of the battery cells 21 during charging and discharging, so that the battery cells 21 operate in a more stable and uniformly stressed environment, thereby optimizing the overall performance of the battery cell assembly 20. At least a portion of the buffer pads 231 may be made of an elastic material so that the buffer pads 231 can be compressed and deformed under pressure, for example, the buffer pads 231 may be made of rubber. There may be one or more buffer pads 231, and when there are multiple buffer pads 231, the multiple buffer pads 231 may be arranged at intervals.

[0084] The heat insulation member 24 includes one or more heat insulation pads 241 disposed between two adjacent battery cells 21 arranged along a first direction X. The heat insulation pads 241 are used to separate the battery cells 21 and reduce heat transfer and heat diffusion between the battery cells 21. At least a portion of the heat insulation pads 241 may be made of materials with good heat insulation properties, such as expandable polystyrene (EPS), aerogel, etc.

[0085] Since the first sidewalls 2111 of the battery cell 21 are sequentially arranged along the first direction X, both the buffer pad 231 and the heat insulation pad 241 are opposite to the first sidewalls 2111 of the battery cell 21. This means that both the buffer pad 231 and the heat insulation pad 241 can separate the large surfaces of adjacent battery cells 21. Because the expansion force of the first sidewall 2111 is greater than that of other locations, the buffer pad 231 can absorb the expansion, effectively reducing the negative impact of the battery cell 21's expansion. Similarly, because the heat generated by the first sidewall 2111 is greater than that of other locations, the heat insulation pad 241 can effectively reduce heat transfer between adjacent battery cells 21.

[0086] In addition, the number of heat insulation pads 241 and buffer pads 231 can be one or more. For battery cells 21 with different usage conditions, the heat insulation pads 241 and buffer pads 231 can be arranged in different ways so that the entire battery cell assembly 20 can achieve a suitable working condition, which can meet the heat insulation design and leave a certain buffer space to absorb the expansion force generated by the breathing effect during battery charging and discharging.

[0087] The battery device 100 provided in this application embodiment includes a battery cell assembly 20, which includes multiple battery cells 21, a buffer member 23, and a heat insulation member 24. The buffer member 23 includes one or more buffer pads 231, which can buffer and reduce the problems of poor material contact, charging and discharging efficiency, and overall performance degradation caused by excessive expansion force of the battery cells 21, thereby improving the mechanical structural stability and reliability of the battery device. The heat insulation member 24 includes one or more heat insulation pads 241, which can insulate and reduce the risk of heat diffusion between the battery cells 21 on both sides of the heat insulation pad 241, thereby improving the reliability of the battery device 100. The first sidewall 2111 of the battery cells is arranged sequentially along the first direction X, and the buffer pads 231 and heat insulation pads 241 are opposite to the first sidewall 2111, which has a good buffering and heat insulation effect. The buffer pad 231 and the heat insulation pad 241 can be arranged in a certain order, which can reduce the heat conduction between battery cells 21, reduce the risk of thermal runaway, and reduce the impact of the expansion and contraction of the battery cell assembly 20 due to breathing on the mechanical components.

[0088] The battery device 100 provided in this application embodiment can be applied to energy storage devices, which not only improves the performance, lifespan, and overall efficiency of the battery cells 21, but also enhances the safety of the energy storage device and reduces the risk of thermal runaway propagation. By setting the buffer component 23, the battery cells 21 can operate in a more stable and uniformly stressed environment, reducing stress differences between battery cells 21 and stress between battery cells 21 and high-voltage connecting copper bars, thereby optimizing the overall performance and consistency of the battery cell assembly 20, which is beneficial to stable operation throughout its entire life cycle. By setting the heat insulation component 24, the safety and reliability of the energy storage device are improved, the durability and performance of the energy storage device are enhanced, and better protection and stability are provided during operation.

[0089] In some embodiments, a buffer pad 231 and / or a heat insulation pad 241 are provided between every two adjacent battery cells 21.

[0090] Multiple battery cells 21 are arranged sequentially along a first direction X. A buffer pad 231 or a heat insulation pad 241 can be provided between any two adjacent battery cells 21, or at least one buffer pad 231 and at least one heat insulation pad 241 can be provided simultaneously. For example, as shown in FIG4, a buffer pad 231 or a heat insulation pad 241 is provided between any two adjacent battery cells 21; in other embodiments, a combination structure of buffer pad 231 and heat insulation pad 241 is provided between two adjacent battery cells 21, for example, buffer pad 231, heat insulation pad 241 and buffer pad 231 are arranged sequentially between two adjacent battery cells 21.

[0091] By adopting the above technical solution, each pair of adjacent battery cells 21 is separated by a buffer pad 231 and / or a heat insulation pad 241, thereby improving the reliability of the battery device 100.

[0092] In some embodiments, only one of a buffer pad 231 and a heat insulation pad 241 is provided between every two adjacent battery cells 21.

[0093] For example, as shown in Figure 4, only a buffer pad 231 or a heat insulation pad 241 is provided between two adjacent battery cells 21. Multiple buffer pads 231 and multiple heat insulation pads 241 can be arranged according to the heat generation and expansion of the battery cell assembly 20.

[0094] By adopting the above technical solution, each pair of adjacent battery cells 21 is separated by a buffer pad 231 or a heat insulation pad 241, and multiple battery cells 21 can be arranged at equal intervals, which can improve the reliability of the battery device 100 without affecting the reduction of the energy density of the battery device 100.

[0095] In some embodiments, at least one heat insulation pad 241 is disposed at the midpoint of the battery cell assembly 20 along the first direction X.

[0096] At least one heat insulation pad 241 is disposed at the middle position of the battery cell assembly 20 along the first direction X. That is to say, compared with the two ends of the battery cell assembly 20 along the first direction X, at least one heat insulation pad 241 is closer to the middle of the battery cell assembly 20. The heat insulation pad 241 can be disposed at the middle of the battery cell assembly 20 or at a position close to the middle of the battery cell assembly 20.

[0097] The heat insulation pad 241, located in the middle of the battery cell assembly 20, can separate multiple battery cells 21 into two battery units. The number of battery cells 21 in the two battery units can be equal or similar, for example, the difference in the number of battery cells 21 between the two battery units can be 1, 2, 3, etc. If one battery cell 21 on one side of the heat insulation pad 241 experiences thermal runaway, the heat generated by the battery cell 21 is not easily transferred to the battery unit on the other side. The battery cell 21 on the other side can operate within a safe operating temperature range. The heat insulation pad 241 reduces the risk of heat transfer and heat diffusion between the two battery units.

[0098] Compared to placing the heat insulation pad 241 near the edge of the battery cell assembly 20, this embodiment places at least one heat insulation pad 241 in the middle of the battery cell assembly 20. The heat insulation pad 241 confines the heat to one side of the battery cell assembly 20, which better reduces the impact of thermal runaway battery cell 21 on other battery cells 21 and better reduces the risk of heat diffusion.

[0099] The battery cell assembly 20 includes a plurality of battery cells 21, wherein the number of battery cells 21 can be odd or even, and correspondingly, the middle battery cell 21 can be one or two. In some embodiments, when the number of battery cells 21 is odd, the two sides of the middle battery cell 21 are respectively attached to a heat insulation pad 241; when the number of battery cells 21 is even, the two middle battery cells 21 are separated by a heat insulation pad 241.

[0100] As shown in Figures 4 to 6, the number of battery cells 21 is odd, and the middle battery cell 21 is the center cell 21a. For example, the battery cell assembly 20 includes 13 battery cells 21, as shown in Figures 4 to 6, and the 7th battery cell 21 from the left is the center cell 21a.

[0101] Two heat insulation pads 241 are respectively attached to opposite sides of the central cell 21a along the first direction X. The two heat insulation pads 241 divide the battery cell assembly 20 into two battery cells of equal number, with the central cell 21a located between the two battery cells. If the central cell 21a experiences thermal runaway, the heat insulation pads 241 reduce the risk of heat generated by the central cell 21a being transferred to both sides; if a battery cell 21 on one side of the central cell 21a experiences thermal runaway, the heat insulation pads 241 can reduce the transfer of heat from one battery cell to the other battery cell.

[0102] As shown in Figure 7, the number of battery cells 21 is even, and the two middle battery cells 21 are the center cell 21a. The heat insulation pad 241 is disposed between the two middle battery cells 21. For example, the battery cell assembly 20 includes 12 battery cells 21, and the 6th and 7th battery cells 21 from the left form the center cell 21a.

[0103] A heat insulation pad 241 is disposed between the two middle battery cells 21. The heat insulation pad 241 divides the battery cell assembly 20 into two battery cells of equal number. If any battery cell 21 on one side of the central cell 21a experiences thermal runaway, the heat insulation pad 241 can reduce the heat generated by the thermally runaway battery cell 21 from being transferred to the other battery cell.

[0104] By adopting the above technical solution, the heat insulation pad 241 located in the middle of the battery cell assembly 20 can divide the battery cell assembly 20 into two battery cells to prevent the battery cells 21 on both sides from transferring heat to each other, thereby reducing the risk of thermal diffusion and thermal runaway in the battery cell assembly 20.

[0105] It is understood that in other embodiments, the heat insulation pad 241 is located in the middle of the battery cell assembly 20, but the heat insulation pad 241 may be spaced apart from the middle battery cell 21.

[0106] The arrangement of the heat insulation pads 241 and the buffer pads 231 can be flexibly configured according to requirements. Referring to Figures 4 to 6, in some embodiments, the heat insulation component 24 includes a plurality of heat insulation pads 241, and the arrangement of the plurality of heat insulation pads 241 is symmetrical about the center position of the battery cell assembly 20.

[0107] When the number of battery cells 21 is odd, the central cell 21a is located at the center of the battery cell assembly 20, and the arrangement of the multiple heat insulation pads 241 is symmetrical about the central cell 21a. For example, as shown in Figure 4, the heat insulation member 24 includes two heat insulation pads 241, which divides the battery cell assembly 20 into two battery cells, and the two heat insulation pads 241 are symmetrical about the central cell 21a; as shown in Figure 5, the heat insulation member 24 includes four heat insulation pads 241, which divides the battery cell assembly 20 into five battery cells, and the four heat insulation pads 241 are symmetrical about the central cell 21a; as shown in Figure 6, the heat insulation member 24 includes six heat insulation pads 241, which divides the battery cell assembly 20 into seven battery cells, and the six heat insulation pads 241 are symmetrical about the central cell 21a.

[0108] When the number of battery cells 21 is even, the gap between two central cells 21a is located at the center of the battery cell assembly 20, and multiple heat insulation pads 241 are symmetrically arranged about the central gap.

[0109] By adopting the above technical solution, the heat insulation component 24 can divide the battery cell assembly 20 into multiple battery cells, reducing the risk of heat diffusion between multiple battery cells; since the multiple heat insulation pads 241 are symmetrically arranged, the battery cell assembly 20 has a good thermal insulation effect on both sides along the first direction X.

[0110] In some embodiments, there are multiple buffer pads 231, and the multiple buffer pads 231 are arranged symmetrically about the center position of the battery cell assembly 20.

[0111] The number of buffer pads 231 is multiple, which can effectively absorb and disperse the mechanical stress generated by the breathing of the battery cells 21, reduce the problem of poor contact of internal battery materials caused by excessive expansion force of battery cells 21, and reduce charging and discharging efficiency and performance, thereby improving the reliability of battery performance and the stability of mechanical structure.

[0112] For example, as shown in Figures 4 to 6, the number of battery cells 21 is odd, and the arrangement of multiple buffer pads 231 is symmetrical about the central cell 21a; as shown in Figure 7, the number of battery cells 21 is even, and the arrangement of multiple buffer pads 231 is symmetrical about the gap between the two central cells 21a.

[0113] The buffer pad 231 is compressible and deformable to provide expansion deformation space for the adjacent battery cell 21, reducing the negative impact of the expansion force of the battery cell 21 and reducing stress concentration inside the battery cell assembly 20, which affects the cycle life of the mechanical components and the battery cell assembly 20. In this embodiment, multiple buffer pads 231 are provided, and the arrangement of the multiple buffer pads 231 is symmetrical about the center position of the battery cell assembly 20. This allows the battery cell assembly 20 to alleviate the impact of the expansion force of the battery cell 21 on both sides along the first direction X. Furthermore, the consistency of the expansion force on both sides of the battery cell assembly 20 is better, resulting in more uniform stress on the battery cell assembly 20 during use, better buffering effect, and further improvement of the cycle life and reliability of the battery cell assembly 20.

[0114] As shown in Figure 6, in some embodiments, buffer pads 231 and heat insulation pads 241 are alternately arranged on one or both sides of the center of the battery cell assembly 20.

[0115] For example, at the center of the battery cell assembly 20 along the first direction X, multiple buffer pads 231 and multiple heat insulation pads 241 are alternately arranged on both sides. Two buffer pads 231 arranged in sequence can support and buffer the adjacent battery cells 21. Several battery cells 21 between two heat insulation pads 241 arranged in sequence form a battery unit. The two heat insulation pads 241 confine heat to the inside of the battery unit, and the heat generated by the battery unit is not easily transferred to other battery units, reducing the risk of heat diffusion.

[0116] By alternating between the buffer pad 231 and the heat insulation pad 241, the heat insulation pad 241 can reduce the heat conduction between battery cells 21, and the thermal runaway of battery cell 21 is less likely to spread to adjacent battery cells 21. The buffer pad 231 can meet the impact of the expansion and contraction of battery cell assembly 20 caused by breathing during charging and discharging. In this way, battery cell assembly 20 has both good thermal isolation and buffering effect, and the internal force of battery cell assembly 20 is relatively balanced.

[0117] Figures 4 to 7 provide different embodiments. It can be understood that the arrangement of the heat insulation pad 241 and the cushioning pad 231 can also be in other ways to meet the needs of heat insulation and cushioning.

[0118] Referring to Figures 3 and 8, in some embodiments, the buffer pad 231 has a through hole 2311 that extends through the buffer pad 231 along a first direction X, and the through hole 2311 corresponds to the center of the battery cell 21.

[0119] The center of the battery cell 21 generates more heat and expands during use than other parts of the battery cell 21. The buffer pad 231 has a through hole 2311 corresponding to the center of the battery cell 21, which can accommodate the expansion and deformation of the center of the battery cell 21.

[0120] By adopting the above technical solution, the buffer pad 231 can fit against the outer periphery of the battery cell 21. During the use of the battery, the buffer pad 231 is subjected to more uniform force and has a better buffering effect. In addition, the buffer pad 231 has a through hole 2311 corresponding to the center of the battery cell 21, which provides space for the expansion of the battery cell 21 during use and can further reduce the negative impact of the expansion force of the battery cell 21.

[0121] In some embodiments, the buffer pad 231 includes two opposing and spaced-apart semi-frames 2312, which are respectively fixed to the battery cell 21 and form a through hole 2311.

[0122] For example, the semi-enclosed frame 2312 is a rectangular frame. It can be understood that the semi-enclosed frame 2312 can also be a semi-circular frame or other shapes. Optionally, the two semi-enclosed frames 2312 are spaced apart in the height direction (third direction Z) of the battery cell 21. It can be understood that the two semi-enclosed frames 2312 can also be spaced apart in the length direction (second direction Y) of the battery cell 21.

[0123] Both semi-frames 2312 are arranged along the edge of the battery cell 21 to provide support for the periphery of the battery cell 21. The two semi-frames 2312 are arranged opposite each other and spaced apart, thus forming a through hole 2311 in the center of the buffer pad 231. During manufacturing, the buffer pad 231 can be made by die-cutting a rigid rubber pad, and its size can be adjusted according to the size of the battery cell 21.

[0124] By setting the buffer pad 231 as two semi-enclosed frames 2312, the battery cell 21 can be supported by the semi-enclosed frames 2312 and the expansion space of the battery cell 21 can be provided by the through holes 2311 between the semi-enclosed frames 2312. The structure of the buffer pad 231 is relatively simple and the cost is low. In addition, the two semi-enclosed frames 2312 can be fixed to the surface of the battery cell 21 respectively, which reduces the difficulty of aligning the buffer pad 231 with the battery cell 21.

[0125] Referring to Figures 3 and 9, in some embodiments, the heat insulation pad 241 includes a heat insulation body 2411 and a reinforcing member 2412. The reinforcing member 2412 is connected to at least one side of the heat insulation body 2411, and the strength of the reinforcing member 2412 is greater than the strength of the heat insulation body 2411. The two sides of the reinforcing member 2412 abut against two adjacent battery cells 21 respectively.

[0126] The heat insulation body 2411 is the main part of the heat insulation pad 241. The area of ​​the heat insulation body 2411 is larger than the area of ​​the reinforcing member 2412. The reinforcing member 2412 can be provided on one or more sides of the heat insulation body 2411. For example, the reinforcing member 2412 is connected to one side of the heat insulation body 2411 along the third direction Z, where the third direction is the height direction of the battery cell 21.

[0127] The insulation body 2411 can be made of insulation materials, such as volatile polystyrene, aerogel, etc.; the strength of the reinforcing member 2412 is greater than the strength of the insulation body 2411. For example, the tensile strength of the reinforcing member 2412 is greater than the tensile strength of the insulation body 2411, and / or the shear strength of the reinforcing member 2412 is greater than the shear strength of the insulation body 2411. Thus, compared with the insulation body 2411, the reinforcing member 2412 is less prone to deformation under pressure. For example, the reinforcing member 2412 can be made of rigid rubber strip.

[0128] The heat insulation pad 241 provided in this application embodiment includes a heat insulation body 2411 and a reinforcing member 2412, which can reduce the risk of the heat insulation body 2411 being subjected to excessive compression, thereby reducing the heat insulation effect and improving the reliability of the heat insulation pad 241.

[0129] In some embodiments, the buffer pad 231 and the first sidewall 2111 of the adjacent battery cell 21 are bonded together, and / or the heat insulation pad 241 and the first sidewall 2111 of the adjacent battery cell 21 are bonded together.

[0130] In the battery cell assembly 20, multiple battery cells 21 are arranged along a first direction X, and the first sidewalls 2111 are also arranged sequentially along the first direction X. A buffer pad 231 is adhered to the first sidewall 2111, and / or a heat insulation pad 241 is adhered to the first sidewall 2111. Adhesion can be achieved through adhesive bonding or by using other materials that provide an adhesive effect.

[0131] By attaching a buffer pad 231 to the first sidewall 2111 and / or attaching a heat insulation pad 241 to the first sidewall 2111, the buffer pad 231 and / or the heat insulation pad 241 can be stably attached to the first sidewall 2111 and are not easily squeezed out. The first sidewall 2111 of the battery cell 21 has a large heat generation and expansion, and the buffer pad 231 and the heat insulation pad 241 can provide better protection for the battery cell assembly 20.

[0132] In some embodiments, the heat insulation pad 241 completely covers the first sidewall 2111.

[0133] Along the first direction X, the orthographic projection of the heat insulation pad 241 toward the battery cell 21 completely covers the first sidewall 2111. The area of ​​the orthographic projection of the heat insulation pad 241 toward the battery cell 21 is greater than or equal to the area of ​​the first sidewall 2111, so that the heat insulation pad 241 completely covers the first sidewall 2111.

[0134] In this way, the heat insulation pad 241 can completely separate two adjacent battery cells 21, reducing heat transfer between adjacent battery cells 21.

[0135] In some embodiments, the thickness of the cushioning pad 231 is 1 mm to 5 mm; and / or, the thickness of the heat insulation pad 241 is 1 mm to 5 mm.

[0136] In this embodiment, the thickness of the buffer pad 231 refers to its initial thickness. When the buffer pad 231 includes two semi-frames 2312, the thickness of the buffer pad 231 is the same as the thickness of the semi-frames 2312. The thickness of the heat insulation pad 241 refers to its initial thickness. When the heat insulation pad 241 includes a heat insulation body 2411 and a reinforcing member 2412, the thickness of the heat insulation pad 241 refers to the initial thickness of the heat insulation body 2411, and the thickness of the reinforcing member 2412 can be the same as the thickness of the heat insulation body 2411.

[0137] The thickness of the buffer pad 231 can be 1mm, 2mm, 2.5mm, 3mm, 4, 5mm, etc. By setting the thickness of the buffer pad 231 to be greater than or equal to 1mm, the buffer pad 231 can have better buffering performance; by setting the thickness of the buffer pad 231 to be less than or equal to 5mm, the energy density of the battery device will not be reduced due to the buffer pad 231 being too thick.

[0138] The thickness of the heat insulation pad 241 can be 1mm, 2mm, 2.5mm, 3mm, 4, 5mm, etc. By setting the thickness of the heat insulation pad 241 to be greater than or equal to 1mm, the heat insulation pad 241 can have better heat insulation performance; by setting the thickness of the heat insulation pad 241 to be less than or equal to 5mm, the energy density of the battery device will not be reduced due to the heat insulation pad 241 being too thick.

[0139] It is understandable that the thickness of the buffer pad 231 and the heat insulation pad 241 can be adjusted according to factors such as the size of the battery cell 21, the heat generated by the battery cell 21, and the expansion force of the battery cell 21.

[0140] Referring again to Figure 3, in some embodiments, the battery cell assembly 20 further includes two end plates 25 and a fixing band 26. Along the first direction X, a plurality of battery cells 21, a buffer member 23 and a heat insulation member 24 are disposed between the two end plates 25, and the fixing band 26 surrounds the outer periphery of the two end plates 25.

[0141] Two end plates 25 are arranged opposite each other along the first direction X, and multiple battery cells 21 are disposed between the two end plates 25. The two end plates 25 enable the multiple battery cells 21, buffer members 23 and heat insulation members 24 to be arranged closely together to form a whole, providing protection for the battery cell assembly 20 and enhancing the structural stability of the battery cell assembly 20.

[0142] The fixing strap 26 is wrapped around the outer periphery of the two end plates 25, that is, the fixing strap 26 is fixed to the outer periphery of the two end plates 25, multiple battery cells 21, buffer member 23 and heat insulation member 24. The fixing strap 26 can be a steel strap or other cable tie. The fixing strap 26 can bind the two end plates 25, multiple battery cells 21, buffer member 23 and heat insulation member 24 together, thereby improving the structural strength and overall stability of the battery cell assembly 20.

[0143] By adopting the above technical solution, the battery cell assembly 20 includes two end plates 25 and a fixing strap 26. Under the restraint of the end plates 25 and the fixing strap 26, the heat insulation pad 241 and the buffer pad 231 can be tightly attached to the battery cell 21, and the structural stability of the battery cell assembly 20 is good. The fixing strap 26 can restrain the battery cell assembly 20. During the charging and discharging process of the battery device 100, the battery cell 21, copper bar, and wire harness separator will not be damaged or structurally faulty due to relative movement, thereby improving the reliability and safety of the battery device 100.

[0144] Referring to Figures 1 to 9, some embodiments of this application provide a battery device 100, including a battery cell assembly 20. The battery cell assembly 20 includes multiple battery cells 21, which are arranged sequentially along a first direction X. Each battery cell 21 includes a first sidewall 2111, which is the wall with the largest area among all the outer walls of the battery cell 21. The first sidewalls 2111 of the multiple battery cells 21 are arranged sequentially along the first direction X. A buffer member 23 includes multiple buffer pads 231, which are disposed between two adjacent battery cells 21. A heat insulation member 24 includes one or more heat insulation pads 241, which are disposed between two adjacent battery cells 21. A buffer pad 231 and / or a heat insulation pad 241 are provided between every two adjacent battery cells 21. The battery device 100 provided by the embodiments of this application has high reliability.

[0145] An embodiment of the second aspect of this application provides an energy storage device including a plurality of battery devices 100 as provided in the second aspect, the battery devices 100 being used to store or provide electrical energy.

[0146] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0147] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0148] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0149] In some embodiments, the energy storage device 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.

[0150] An embodiment of the third aspect of this application provides an energy storage system, including a power conversion device and an energy storage device provided in the third aspect, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0151] In some embodiments, the energy storage system may include one or more energy storage devices and a power converter system (PCS), the power converter being connected between the power generation equipment and the energy storage devices. The power generation equipment generates electrical energy, which can be stored in the energy storage devices via the power converter. For example, the power generation equipment may specifically be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of power generation equipment is not limited in this application.

[0152] An embodiment of the fourth aspect of this application provides a charging network, including a charging pile and an energy storage device of the second aspect or an energy storage system of the third aspect, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0153] The charging pile and the battery unit 100 in the energy storage device are electrically connected via a cable. The battery unit 100 can supply the charging pile with its stored electrical energy. The charging pile has one or more connectors for connecting to electrical equipment (such as vehicles) to replenish the energy of the equipment. The energy storage device can be located inside the charging pile (e.g., an integrated charging and energy storage unit) or outside the charging pile.

[0154] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, Includes a battery cell assembly, the battery cell assembly comprising: Multiple battery cells are arranged sequentially along a first direction. Each battery cell includes a first sidewall, which is the wall with the largest area among all the outer walls of the battery cell. The first sidewalls of the multiple battery cells are arranged sequentially along the first direction. A buffer component includes one or more buffer pads disposed between two adjacent battery cells; A thermal insulation component includes one or more thermal insulation pads disposed between two adjacent battery cells.

2. The battery device as claimed in claim 1, characterized in that, A buffer pad and / or a heat insulation pad are provided between every two adjacent battery cells.

3. The battery device as claimed in claim 1, characterized in that, Only one of the buffer pad and the heat insulation pad is provided between each two adjacent battery cells.

4. The battery device according to any one of claims 1-3, characterized in that, At least one of the heat insulation pads is located at the midpoint of the battery cell assembly along the first direction.

5. The battery device as claimed in claim 4, characterized in that, When the number of battery cells is odd, the two sides of the middle battery cell are respectively attached to one of the heat insulation pads; When the number of battery cells is even, the two middle battery cells are separated by a heat insulation pad.

6. The battery device according to any one of claims 1-5, characterized in that, The heat insulation component includes a plurality of heat insulation pads, and the arrangement of the plurality of heat insulation pads is symmetrical about the center position of the battery cell assembly.

7. The battery device according to any one of claims 1-6, characterized in that, The number of buffer pads is multiple, and the arrangement of the multiple buffer pads is symmetrical about the center position of the battery cell assembly.

8. The battery device according to any one of claims 1-7, characterized in that, The buffer pad and the heat insulation pad are alternately arranged on one or both sides of the center position of the battery cell assembly.

9. The battery device according to any one of claims 1-8, characterized in that, The buffer pad has a through hole that extends through the buffer pad along the first direction and corresponds to the center of the battery cell.

10. The battery device as claimed in claim 9, characterized in that, The buffer pad includes two opposing and spaced-apart semi-frames, which are respectively fixed to the battery cell and form the through hole.

11. The battery device according to any one of claims 1-10, characterized in that, The heat insulation pad includes a heat insulation body and a reinforcing member. The reinforcing member is connected to at least one side of the heat insulation body, and the strength of the reinforcing member is greater than the strength of the heat insulation body. The two sides of the reinforcing member respectively abut against two adjacent battery cells.

12. The battery device according to any one of claims 1-11, characterized in that, The buffer pad and the first sidewall of the adjacent battery cell are bonded together, and / or, The heat insulation pad is bonded to the first sidewall of the adjacent battery cell.

13. The battery device according to any one of claims 1-12, characterized in that, The heat insulation pad completely covers the first sidewall.

14. The battery device according to any one of claims 1-13, characterized in that, The thickness of the cushioning pad is 1mm to 5mm; and / or, The thickness of the heat insulation pad is 1mm to 5mm.

15. The battery device according to any one of claims 1-14, characterized in that, The battery cell assembly also includes two end plates and a fixing band. Along the first direction, a plurality of battery cells, the buffer member, and the heat insulation member are disposed between the two end plates; the fixing band surrounds the outer periphery of the two end plates.

16. An energy storage device, characterized in that, It includes a plurality of battery devices as described in any one of claims 1-15, the battery devices being used to store or provide electrical energy.

17. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 16, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

18. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 16 or an energy storage system as described in claim 17, wherein the energy storage device is used to provide electrical energy to the charging pile.

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