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

Abstract

The utility model discloses a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network, and belongs to the technical field of batteries. The battery device includes: a frame forming at least one cavity for accommodating a battery cell; the battery monomer groups are in one-to-one correspondence with the cavities, are accommodated in the corresponding cavities and are clamped between beams which are oppositely arranged in the corresponding cavities along the first direction, each battery monomer group comprises a liquid battery monomer and a solid battery monomer which are arranged side by side along the first direction, the liquid battery monomer is arranged on the outermost side of the first direction, and the solid battery monomer is arranged on the outermost side of the first direction; and the solid-state battery cells are clamped between the liquid-state battery cells. According to the technical scheme, the liquid-state battery monomers and the solid-state battery monomers in the same battery monomer group are matched with each other, so that the thermal runaway diffusion risk of the battery monomer group can be reduced, good interface contact of the solid-state battery monomers can be kept for a long time, and the performance of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a battery device, an energy storage device, an energy storage system, a power consumption device and a charging network. BACKGROUND

[0002] A solid-state battery conducts a positive electrode and a negative electrode through a solid-state electrolyte, and is highly safe. However, the interface impedance of the solid-state battery is relatively large, and a large restraining pressure is required to maintain good interface contact. The pressure loaded at the time of factory delivery is unloaded due to long-term use, which causes the resistance of the solid-state battery to increase sharply, and there is room for improvement. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a battery device, an energy storage device, an energy storage system, a power consumption device and a charging network, which can enable a solid-state battery monomer to maintain good interface contact for a long time.

[0004] In a first aspect, the present application provides a battery device, comprising:

[0005] a frame forming at least one cavity for accommodating a battery monomer;

[0006] at least one battery monomer group corresponding to the cavity, accommodated in the corresponding cavity and clamped between the beams oppositely arranged along a first direction of the corresponding cavity, the battery monomer group comprising liquid battery monomers and solid-state battery monomers arranged side by side along the first direction, the liquid battery monomers being arranged at the outermost side of the first direction, and the solid-state battery monomers being clamped between the liquid battery monomers.

[0007] In the above technical solution, the liquid battery monomers and the solid-state battery monomers in the same battery monomer group cooperate with each other, which can reduce the risk of thermal runaway diffusion of the battery monomer group, help the solid-state battery monomer to maintain good interface contact for a long time, and improve the performance of the battery device.

[0008] According to one embodiment of the present application, the maximum expansion surface of the liquid battery monomer abuts against the adjacent solid-state battery monomer along the first direction.

[0009] In the above technical solution, the maximum expansion surface of the liquid battery monomer abuts against the adjacent solid-state battery monomer along the first direction, which can balance the pressure between the liquid battery monomer and the solid-state battery monomer through the expansion of the liquid battery monomer, and improve the long-term stability and safety of the battery monomer group.

[0010] According to one embodiment of the present application, the battery device further comprises end plates, the battery monomer group is provided with the end plates at both ends along the first direction.

[0011] In the above technical solution, the battery monomer group is in abutment with the end plates at both ends, which can enhance the structural stability and safety of the battery monomer group.

[0012] According to one embodiment of the present application, the battery device further comprises a partition plate, the partition plate is arranged between the end plates and the battery monomer group.

[0013] In the above technical solution, the partition plate can strengthen the stress of the battery monomer group in the battery device and protect the end plates.

[0014] According to one embodiment of the present application, each of the battery monomers in the battery monomer group is sequentially connected in series.

[0015] In the above technical solution, the battery monomers are sequentially connected in series, which can effectively improve the voltage of the battery monomer group and meet the use of high-voltage equipment.

[0016] According to one embodiment of the present application, the battery monomer group is multiple, and multiple battery monomer groups are connected in series.

[0017] In the above technical solution, multiple battery monomer groups connected in series can effectively improve the voltage of the battery system and realize high-voltage output.

[0018] In a second aspect, the present application provides an energy storage device, comprising: multiple battery devices as described in any one of the above, the battery devices are used for storing or providing electric energy.

[0019] In the above description, multiple battery devices form an energy storage device, which can be used for storing or providing electric energy.

[0020] In a third aspect, the present application provides an energy storage system, comprising: a power conversion device and an energy storage device as described above, the power conversion device is used for electrically connecting a power generation equipment and the energy storage device.

[0021] In the above description, through the cooperation of the power conversion device and the energy storage device, the stability and flexibility of the energy storage system can be improved, and at the same time, the energy storage system is electrically connected with the power generation equipment through the power conversion device.

[0022] In a fourth aspect, the present application provides a power consumption device, comprising: a battery monomer, a battery device, an energy storage device or an energy storage system as described in any one of the above, the battery monomer or the battery device is used for storing or providing electric energy.

[0023] In the above description, the power consuming device drives the working mechanism inside or performs specific functions by integrating the battery device as an energy source.

[0024] In a fifth aspect, the present application provides a charging network, comprising: a charging pile and an energy storage device or an energy storage system, wherein the energy storage device is configured to provide electric energy for the charging pile.

[0025] In the above description, the charging network is formed by the energy storage device or the energy storage system and the charging pile, so that the power supply can be optimized, the load pressure of the power grid can be relieved, and the influence of power grid fluctuation on charging efficiency can be reduced.

[0026] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0028] Figure 1 FIG. 1 is a structural schematic diagram of a battery device according to an embodiment of the present application;

[0029] Figure 2 FIG. 2 is another structural schematic diagram of a battery device according to an embodiment of the present application;

[0030] Figure 3 FIG. 3 is a third structural schematic diagram of a battery device according to an embodiment of the present application;

[0031] Figure 4 FIG. 4 is a fourth structural schematic diagram of a battery device according to an embodiment of the present application.

[0032] Reference Signs:

[0033] Battery device 10;

[0034] Battery cell group 110;

[0035] Liquid battery cell 111, solid battery cell 112;

[0036] Frame 120, cavity 121;

[0037] End plate 131, cross beam 132;

[0038] First direction X. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as limiting the present application.

[0040] The present application aims to at least solve one of the technical problems existing in the related art. To this end, the present application proposes a battery device, an energy storage device, an energy storage system, a power consumption device, and a charging network, which can enable solid-state battery cells to maintain good interface contact for a long time.

[0041] Reference is made below to Figures 1-4 A battery device 10 according to an embodiment of the present application is described.

[0042] As shown in Figure 1 and Figure 2 , the battery device 10 comprises a frame 120 and at least one battery cell group 110.

[0043] The frame 120 is mainly used to provide structural support for the battery device 10, and has good structural strength and sealing performance, for accommodating and fixing the battery cell group 110, thereby reducing displacement or damage of the battery cell during use. For example, the frame 120 can be made of materials with high strength and durability, such as aluminum alloy, carbon fiber or other composite materials, to maintain the structural stability of the battery device 10 during use.

[0044] The battery cell group 110 is the core part of the battery device 10, which is usually composed of a plurality of battery cells. The plurality of battery cells in the battery cell group 110 can be connected in series, parallel or mixed. The battery cells can also be of different types, such as liquid batteries or solid-state batteries.

[0045] As shown in Figure 1 and Figure 2 , the battery device 10 can include at least one battery cell group 110 and at least one cavity 121, and the battery cell group 110 corresponds to the cavity 121 one by one, and is accommodated in the corresponding cavity 121. At the same time, the battery cell group 110 is clamped between the beams arranged in opposite directions along the first direction X in the corresponding cavity 121. The frame 120 and the cavity 121 can effectively protect the battery cell group 110, reduce the safety risk of damage or short circuit of the battery cell caused by external force, and the frame 120 can also be used as an isolation layer for the battery cell group 110, to reduce the risk of electrical short circuit or fault propagation between different battery cell groups 110.

[0046] As shown in Figure 1As shown, the battery cell group 110 includes liquid battery cells 111 and solid battery cells 112 arranged side by side along the first direction X, and the arrangement of the two can be optimized according to the working principle of the battery cell.

[0047] Specifically, the solid battery cell 112 conducts the positive electrode and the negative electrode through the solid-state electrolyte, and the interface impedance is large. When the restraint pressure is insufficient, it is difficult to maintain good interface contact, thereby causing the internal resistance of the solid battery cell 112 to be large, which affects the performance of the solid battery cell 112.

[0048] In addition, as shown in Figure 3 and Figure 4 , there is a liquid electrolyte inside the liquid battery cell 111. During the charging and discharging process of the liquid battery cell 111, a chemical reaction occurs inside the liquid battery cell 111, causing a change in temperature, thereby causing the expansion of the gas inside the liquid battery cell 111. The expansion of the gas volume causes the deformation or bulging of the liquid battery cell 111 shell. In addition, the liquid battery cell 111 is distributed on the outermost side of the battery cell group 110 along the first direction X, and there is no contact between the liquid battery cells 111, which can reduce the risk of thermal runaway diffusion. In addition, the liquid battery cell 111 and the solid battery cell 112 are pressed against each other, which can apply appropriate external pressure to the clamped solid battery cell 112.

[0049] Arranging the liquid battery cell 111 on the outermost side along the first direction X and clamping the solid battery cell 112 between the liquid battery cells 111, during the early working process of the battery device 10, the frame 120 can provide the solid battery cell 112 with an initial restraint pressure. During the long-term working process of the battery device 10, the long-term cyclic gas production characteristics of the liquid battery cell 111 can be used to relieve the stress deformation of the frame 120 through the reverse force of the expanded liquid battery cell 111, continuously apply appropriate external pressure to the clamped solid battery cell 112, and maintain good interface contact of the solid battery cell 112.

[0050] In related technologies, the solid-state battery conducts the positive electrode and the negative electrode through the solid-state electrolyte, which is safe, but the interface impedance of the solid-state battery is large, and a large restraint pressure is required to maintain good interface contact. The pressure loaded at the factory will be unloaded due to long-term use, causing the resistance of the solid-state battery to increase sharply, leaving room for improvement.

[0051] Specifically, the pressure loaded at the factory is mainly achieved through strong interference fit, but during the long-term working process of the solid-state battery, the battery box body experiences stress fatigue for a long time and gradually deforms, causing the external pressure on the solid-state battery to decrease, the internal resistance of the solid-state battery to increase, and the subsequent performance of the solid-state battery to be affected.

[0052] Based on the above considerations, in order to solve the problem that the solid-state battery is difficult to maintain good interface contact for a long time, the inventors have designed a battery device 10. In the battery device 10 of this structure, the battery cell group 110 includes liquid battery cells 111 and solid-state battery cells 112 arranged side by side along the first direction X. The liquid battery cells 111 are arranged at the outermost side of the first direction X, and the solid-state battery cells 112 are clamped between the liquid battery cells 111. By the expansion of the liquid battery cells 111, appropriate external pressure can be continuously applied to the clamped solid-state battery cells 112, so that the solid-state battery cells 112 can maintain good interface contact.

[0053] According to the battery device 10 provided by the embodiments of the present application, the liquid battery cells 111 and the solid-state battery cells 112 in the same battery cell group 110 cooperate with each other, which can reduce the risk of thermal runaway diffusion of the battery cell group 110, help the solid-state battery cells 112 maintain good interface contact for a long time, and improve the performance of the battery device 10.

[0054] In some embodiments, as shown in Figure 3 and Figure 4 The maximum expansion surface of the liquid battery cell 111 abuts against the adjacent solid-state battery cell 112 along the first direction X.

[0055] During the charging and discharging process, the chemical reaction inside the liquid battery cell 111 causes the volume to expand, and is usually concentrated on the maximum expansion surface of the liquid battery cell 111, that is, the side surface of the liquid battery cell 111 distributed along the first direction X. At the same time, the liquid battery cell 111 and the solid-state battery cell 112 are arranged side by side along the first direction X in the battery cell group 110, and the maximum expansion surface of the liquid battery cell 111 abuts against the adjacent solid-state battery cell 112 along the first direction X.

[0056] The side surface of the liquid battery cell 111 and the solid-state battery cell 112 along the first direction X is in close contact. When the liquid battery cell 111 expands, a certain pressure will be applied to the solid-state battery cell 112, so that the solid-state battery cell 112 can maintain good interface contact. At the same time, the rigidity and structural stability of the solid-state battery cell 112 can limit the expansion amplitude of the liquid battery cell 111 to a certain extent, reduce the mechanical stress caused by expansion, and thus improve the structural stability of the entire battery cell group 110.

[0057] It can be understood that the maximum expansion surface of the liquid battery cell 111 abuts against the adjacent solid-state battery cell 112 along the first direction X, which can balance the pressure between the liquid battery cell 111 and the solid-state battery cell 112 through the expansion of the liquid battery cell 111, and improve the long-term stability and safety of the entire battery cell group 110.

[0058] In some embodiments, as shown inFigure 3 and Figure 4 As shown in FIG. 1, the battery device 10 further comprises end plates 131, which are arranged at both ends of the battery cell group 110 along the first direction X.

[0059] The end plates 131 are arranged at both ends of the battery cell group 110 along the first direction X, and are used to separate the battery cell group 110 from the frame 120, so as to reduce displacement, deformation or damage of the battery cell group 110 during use.

[0060] The end plates 131 can also provide physical support for the battery cell group 110. When the battery cell group 110 is just started to work, the end plates 131 can be in interference fit with the battery cell group 110, so as to provide pressure for the battery cell group 110, so that the solid-state battery cells 112 maintain good interface contact. After long-term work, the end plates 131 are deformed after long-term stress fatigue, and at this time, the expansion force of the liquid-state battery cells 111 acts on the end plates 131 and the solid-state battery cells 112 at the same time, so as to keep the gap between the liquid-state battery cells 111 and the solid-state battery cells 112 consistent.

[0061] In addition, the end plates 131 are usually made of materials with high strength and durability, such as aluminum alloy, carbon fiber or other composite materials, so as to withstand the pressure from the battery cell group 110. The end plates 131 also help to conduct the heat generated by the battery cell group 110 from the inside of the battery cell group 110 to the outside, so as to reduce the temperature of the battery cell group 110.

[0062] It can be understood that the abutment of the battery cell group 110 at both ends with the end plates 131 can enhance the structural stability and safety of the battery cell group 110.

[0063] In some embodiments, the battery device 10 can further comprise a partition plate arranged between the end plates 131 and the battery cell group 110.

[0064] The addition of the partition plate between the end plates 131 and the battery cell group 110 is mainly used to strengthen the stress of the battery cell group 110 and the strength of the end plates 131. The end plates 131 are deformed after long-term stress, and long-term stress fatigue has a certain influence on the strength of the end plates 131. After the addition of the partition plate, the battery cell group 110 is in contact with the partition plate. After the expansion of the liquid-state battery cells 111, the expansion force acts on the partition plate. The partition plate can be made of materials with high hardness, such as metal or polymer, so as to withstand the expansion force from the liquid-state battery cells 111, and can reduce the influence of the battery cell group 110 on the end plates 131.

[0065] It can be understood that the partition plate can play a role of strengthening the stress of the battery cell group 110 and protecting the end plates 131 in the battery device 10.

[0066] In some embodiments, as shown in FIG. 2, the battery device 10 further comprises a plurality of partition plates 132 arranged between the end plates 131 and the battery cell group 110.Figure 1 As shown, each battery cell in the battery cell group 110 is connected in series.

[0067] In the battery cell group 110, the plurality of battery cells are connected in series by connecting the positive electrode of each battery cell to the negative electrode of the next battery cell. The connection of the battery cells in series can accumulate the voltage of each battery cell, and the total voltage of the battery cell group 110 is the sum of the voltages of the battery cells. In the series connection, the voltage of the battery cells is accumulated, and the current size is the same between all the battery cells, that is, all the battery cells have the same discharge capacity.

[0068] It can be understood that connecting the battery cells in series can effectively increase the voltage of the battery cell group 110, and meet the use of high-voltage equipment.

[0069] In some embodiments, as shown in Figure 2 The battery cell group 110 is connected in series.

[0070] The battery cell group 110 is composed of a plurality of battery cells connected in series, and the plurality of battery cell groups 110 are also connected in series to form a complete battery system.

[0071] The plurality of battery cell groups 110 are connected in series by connecting the positive electrode of each battery cell group 110 to the negative electrode of the next battery cell group 110, thereby forming a battery module array and achieving higher voltage output. After the plurality of battery cell groups 110 are connected in series, the voltage of the overall battery system is the sum of the voltages of each battery cell group 110.

[0072] In addition, the plurality of battery cell groups 110 are respectively accommodated in corresponding cavities 121, and a cross beam 132 can be arranged between the respective cavities 121 in the first direction X to separate different battery cell groups 110.

[0073] It can be understood that the series connection of the plurality of battery cell groups 110 can effectively increase the voltage of the battery system and achieve high-voltage output.

[0074] The embodiments of the present application also provide a power storage device, which comprises a plurality of battery devices 10, and the battery device 10 is used for storing or providing electric energy.

[0075] The power storage device is a system composed of a plurality of battery devices 10, and is used for storing or providing electric energy. The power storage device can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems, etc. The power storage device can store electric energy as needed and output electric energy at appropriate times. For example, the power storage device can store electric energy during the low electricity consumption period, and provide electric energy for related users or electric devices during the peak electricity consumption period.

[0076] The energy storage device can store electrical energy by converting it into chemical energy through the battery device 10. When the battery device 10 is charging, an external power source provides electrical energy, which is stored in the positive and negative electrodes of the battery device 10 through an electrochemical reaction of the battery device 10. When electrical energy is needed, the battery device 10 converts the stored chemical energy into electrical energy through an electrochemical reaction, which is used by an external load.

[0077] It can be understood that a plurality of battery devices 10 form an energy storage device, which can be used to store or provide electrical energy.

[0078] The embodiments of the present application also provide an energy storage system, which includes a power conversion device and an energy storage device. The power conversion device is used to electrically connect a power generation equipment and the energy storage device.

[0079] The core function of the energy storage device is to store electrical energy, which is usually composed of a plurality of battery devices 10. A common type of energy storage system is a lithium battery energy storage device, which can store electrical energy when the demand for electrical energy is low and release electrical energy when the demand for electrical energy is high, thereby balancing the load of the power grid or improving the availability and stability of the energy storage system.

[0080] The power conversion device is responsible for bidirectional conversion of electrical energy, which can be used to electrically connect the power generation equipment and the energy storage device, convert alternating current generated by the power generation equipment into direct current required by the energy storage device, or convert direct current stored in the energy storage device into alternating current for output to the power grid or load.

[0081] The power generation equipment is used to generate electrical energy, which can be stored in the energy storage device through the power conversion device. Exemplarily, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, a wind power generation equipment, etc.

[0082] The power conversion device mainly includes a rectifier and an inverter. The rectifier is used to convert alternating current into direct current for charging the energy storage device. The inverter is used to convert direct current in the energy storage device into alternating current for use by the power grid or load.

[0083] It can be understood that the stability and flexibility of the energy storage system can be improved by cooperation of the power conversion device and the energy storage device. At the same time, the energy storage system is electrically connected to the power generation equipment through the power conversion device.

[0084] The embodiments of the present application also provide an electrical device, which includes a battery device 10, an energy storage device or an energy storage system. The battery device 10 is used to store or provide electrical energy.

[0085] The electrical device is a device or system that relies on electrical energy for work, which can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric vehicle and a ship, etc., covering from simple portable electronic devices to complex household appliances and industrial equipment, etc.

[0086] The battery device 10 serves as the main power supply of the electric device, and is mainly connected to other parts of the electric device through the output port, responsible for converting chemical energy into electrical energy to provide a continuous and stable power supply for the device. Compared with the fixed power supply, the battery device 10 has higher portability, so that the electric device can work independently without external power supply. The battery device 10 is internally composed of a plurality of battery cell groups 110, which are connected in a specific manner, such as series or parallel, to form a whole to provide the required voltage and capacity.

[0087] It can be understood that the electric device drives the internal working mechanism or performs a specific function by integrating the battery device 10 as an energy source.

[0088] The charging network provided by the embodiment of the present application comprises a charging pile and an energy storage device or an energy storage system, and the energy storage device is used to provide electric energy for the charging pile.

[0089] The charging pile and the energy storage device are electrically connected, and the energy storage device is used to provide electric energy for the charging pile. The battery device 10 in the energy storage device and the charging pile are electrically connected through a cable. The battery device 10 can provide the stored electric energy to the charging pile. The charging pile has one or more connectors for connecting with the electric device, so as to supplement the electric device.

[0090] The energy storage device is used to provide electric energy for the charging pile, which can be located inside or outside the charging pile. The charging pile is a connecting device between the electric vehicle and the power grid or the charging network, which is used to deliver electric energy from the power grid or the energy storage device to the battery of the electric vehicle. The charging pile can be divided into different types according to the charging mode, power level and the type of the adapted electric vehicle, such as alternating current charging pile and direct current charging pile.

[0091] It can be understood that the charging network composed of the energy storage device or the energy storage system and the charging pile can optimize the power supply, relieve the pressure of the power grid, and reduce the influence of the power grid fluctuation on the charging efficiency.

[0092] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents a "or" relationship between the associated objects before and after.

[0093] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0094] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0095] In the description of the present application, "a plurality of" means two or more.

[0096] In the description of the present application, "above" or "below" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0097] In the description of the present application, "above", "over" and "on" the first feature of the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0098] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized by, Comprising: a frame forming at least one cavity for accommodating a battery cell; at least one battery cell group corresponding to the cavity, accommodated in the corresponding cavity and clamped between beams of the corresponding cavity arranged opposite along a first direction, the battery cell group comprising liquid battery cells and solid battery cells arranged side by side along the first direction, the liquid battery cells being arranged at the outermost side along the first direction and the solid battery cells being clamped between the liquid battery cells.

2. The battery device according to claim 1, characterized by The largest expansion surface of the liquid battery cells abuts the adjacent solid battery cells along the first direction.

3. The battery device of claim 1, wherein Further comprising: end plates, the battery cell group being provided with the end plates at both ends along the first direction.

4. The battery device according to claim 3, characterized by Further comprising: a partition plate, the partition plate being arranged between the end plates and the battery cell group.

5. The battery device according to any one of claims 1 to 4, characterized by, The battery cells in the battery cell group are connected in series in sequence.

6. The battery device of claim 5, wherein, The battery cell group is a plurality of battery cell groups connected in series.

7. An energy storage device, characterized by, Comprising: a plurality of battery devices according to any one of claims 1-6, the battery devices being used for storing or providing electric energy.

8. An energy storage system characterized by, Comprising: a power conversion device and an energy storage device according to claim 7, the power conversion device being used for electrically connecting a power generation device and the energy storage device.

9. An electrical device, characterized by Comprising: a battery device according to any one of claims 1-6, an energy storage device according to claim 7 or an energy storage system according to claim 8, the battery device being used for storing or providing electric energy.

10. A charging network characterized in that, Comprising: a charging pile and an energy storage device according to claim 7 or an energy storage system according to claim 8, the energy storage device being used for providing electric energy for the charging pile.

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