Battery module, energy storage device and power supply system

Abstract

The invention discloses a battery module, an energy storage device and a power supply system, and relates to the technical field of energy storage. The battery module comprises fixed end plates, battery monomers and a sampling assembly, the two fixed end plates are oppositely arranged and form an accommodating space, the top surfaces of the two fixed end plates are both provided with lug plates, and the lug plates are provided with through hoisting holes; the plurality of battery monomers are arranged between the two fixed end plates; and the sampling assembly is limited between the lug plates on the two fixed end plates. In the embodiment of the invention, the battery module can be hoisted and carried based on the hoisting holes formed in the lug plates on the two fixed end plates, so that the carrying efficiency of the battery module is improved, meanwhile, the risk that the battery module falls in the hoisting and carrying process is avoided, and the assembly yield of the energy storage device is improved; besides, for the sampling assembly at the top end of the single battery, phase can be realized based on the lug plates on the two fixed end plates, the mounting yield of the sampling assembly at the top of the single battery is ensured, and meanwhile, the assembly efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and more specifically, to a battery module, an energy storage device, and a power supply system. Background Art

[0002] Currently, existing battery packs consist of a battery case and battery modules mounted within it. The battery modules include a pair of fixed end plates and multiple battery cells sandwiched between them. During battery pack assembly, each battery module is assembled first, and then the multiple modules are compactly arranged within the battery case. Summary of the Invention

[0003] A main purpose of the present application is to provide a battery module, energy storage device and power supply system that can improve handling efficiency and assembly efficiency.

[0004] To achieve the above application objectives, this application adopts the following technical solutions:

[0005] According to one aspect of the present application, a battery module is provided, characterized in that it includes: fixed end plates, two of the fixed end plates are arranged opposite to each other, and an accommodating space is formed between the pair of fixed end plates, and the top surfaces of the two fixed end plates are respectively provided with at least two ear plates, and the ear plates have penetrating lifting holes; battery cells, a plurality of the battery cells are arranged along the distribution direction of the two fixed end plates, and are located in the accommodating space between the two fixed end plates; a sampling assembly is located at the top of the plurality of the battery cells and is limited between the ear plates on the two fixed end plates.

[0006] In the embodiment of the present application, the lifting and transportation of the battery module is achieved based on the lifting holes of the ear plates on the two fixed end plates, thereby improving the transportation efficiency of the battery module, while avoiding the risk of the battery module falling during the lifting and transportation process, and improving the assembly yield of the energy storage device; in addition, for the sampling component on the top of the battery cell, the phase can be achieved based on the ear plates on the two fixed end plates, thereby ensuring the installation yield of the sampling component on the top of the battery cell and improving the assembly efficiency.

[0007] According to one embodiment of the present application, the surface of the fixed end plate facing away from the battery cell has a strip-shaped first reinforcing rib; the length direction of the first reinforcing rib is parallel to the height direction of the battery module, and the ear plate is located on the extension line of the first reinforcing rib.

[0008] In the embodiment of the present application, based on the setting of the first reinforcing rib, it is convenient to improve the structural strength of the fixed end plate at the hoisting position along the height direction of the battery module, thereby avoiding the situation where the fixed end plate is deformed due to the pulling force when the battery module is hoisted based on the hoisting hole on the ear plate. In particular, with the setting of a high-capacity battery module, it avoids the situation where the fixed end plate is pulled and deformed due to the overall weight of the battery module.

[0009] According to one embodiment of the present application, the surface of the fixed end plate facing away from the battery cell has a plurality of reinforcing plates, and the plurality of reinforcing plates form a plurality of grids; the fixed end plate has a central area, and the surface facing away from the battery cell has a plurality of strip-shaped second reinforcing ribs, and the plurality of second reinforcing ribs are spaced apart in the central area, the vertical center line of the central area coincides with the vertical center line of the fixed end plate, and the ratio between the width of the central area and the width of the fixed end plate is greater than or equal to 0.25 and less than or equal to 0.5.

[0010] In the embodiment of the present application, for battery cells with large width, the provision of multiple second reinforcing ribs in the central area of the fixed end plate can limit the deformation tendency of the battery cell in the central part, and promote the battery cell to deform uniformly over the entire large surface (i.e., the entire surface facing the fixed end plate); that is, it is possible to avoid the extreme deformation of the battery cell in the length direction of the battery module, so as to reduce the extreme extrusion of the fixed end plate.

[0011] According to one embodiment of the present application, the length direction of the second reinforcing rib is parallel to the width direction of the battery module.

[0012] In the embodiment of the present application, the second reinforcing ribs can effectively enhance the anti-deformation strength of the fixed end plate along the width direction of the battery module, thereby ensuring the expansion limiting strength of the battery cell.

[0013] According to one embodiment of the present application, the plurality of well grids having the second reinforcing ribs in the central area are in a cross-shaped structure.

[0014] According to one embodiment of the present application, two buffer cottons are provided on the side of the fixed end plate facing the battery cell; the length direction of the buffer cotton is parallel to the width direction of the battery module, and the two buffer cottons are respectively close to the top and bottom surfaces of the fixed end plate.

[0015] In the embodiment of the present application, by setting the two buffer cottons at intervals, elastic buffering is achieved between the battery cell and the fixed end plate, and the deformable gap of the battery cell is increased based on the gap between the two buffer cottons.

[0016] According to one embodiment of the present application, the distance between one of the two buffer cottons close to the bottom surface of the fixed end plate and the bottom surface of the fixed end plate is greater than or equal to 5 mm.

[0017] In the embodiment of the present application, the situation in which the thermal conductive adhesive overflows from the bottom of the battery cell and soaks the buffer cotton, causing the bottom buffer cotton to solidify, can be reduced or even avoided, thereby ensuring the elastic reliability of the bottom buffer cotton.

[0018] According to an embodiment of the present application, the sampling assembly includes an isolation plate, and an end surface of the ear plate in the height direction of the battery module is flush with a surface of the isolation plate facing away from the battery cell.

[0019] In the embodiment of the present application, the fixed end plate is prevented from occupying a large space in the height direction of the battery module, thereby improving the space utilization rate in the battery box.

[0020] According to one embodiment of the present application, the lifting hole passes through the ear plate along the width direction of the battery module.

[0021] In the embodiment of the present application, a hoisting hole is provided through the ear plate along the width direction of the battery module to avoid interference of the hook when hoisting the battery module, thereby improving the hoisting efficiency of the battery module.

[0022] According to one embodiment of the present application, the fixed end plate has a plurality of fixing holes passing through the height direction of the battery module; the plurality of fixing holes include a center hole, a pair of offset holes and a pair of edge holes, the center hole, the pair of offset holes and the pair of edge holes are distributed along the width direction of the battery module, the pair of offset holes are located between the pair of edge holes, and the center hole is located between the pair of offset holes.

[0023] In the embodiment of the present application, the five fixing holes on the fixed end plate are used to ensure the stability of the fixed end plate on the fixed beam, so as to achieve the stability of the battery cell limit and avoid the situation where, after multiple battery cells expand, a battery cell close to the fixed end plate drives and pulls the liquid cooling plate due to the large displacement.

[0024] According to one embodiment of the present application, the distance between the offset hole and the center hole is smaller than the distance between the offset hole and the adjacent edge hole, and the distance between a pair of the offset holes is greater than the distance between the offset hole and the adjacent edge hole.

[0025] According to one embodiment of the present application, the fixed end plate is provided with at least one group of transition plates, and the multiple transition plates of each group are arranged at intervals along the height direction of the battery module, and the transition plates have connecting holes; each group of transition plates corresponds to one of the fixed holes, and the connecting holes of the multiple transition plates of each group and the corresponding fixing holes are coaxial holes.

[0026] According to one embodiment of the present application, the fixed end plate has two side walls that are parallel to the height direction of the battery module and opposite to each other along the width direction of the battery module, the edges of the side walls away from the battery cells are set with arc chamfers, and both side walls of the fixed end plate have limiting grooves; the battery module also includes a binding piece, which is wrapped around a pair of the fixed end plates and is limited in the limiting grooves.

[0027] According to one aspect of the present application, an energy storage device is provided, comprising a battery box and the battery module described in the above aspect, wherein the battery module is accommodated in the battery box.

[0028] According to one embodiment of the present application, a liquid cooling plate is provided at the bottom of the battery box, the battery module is supported on the liquid cooling plate, and the distance between the battery cell and the liquid cooling plate is smaller than the distance between the fixed end plate and the liquid cooling plate.

[0029] In the embodiment of the present application, the distance between the battery cell and the liquid cooling plate is set to be smaller than the distance between the fixed end plate and the liquid cooling plate to ensure preferential contact between the battery cell and the liquid cooling plate or the thermal conductive adhesive, thereby ensuring the reliability of heat transfer between the battery cell and the liquid cooling plate.

[0030] According to one embodiment of the present application, the bottom surface of the fixed end plate has a notch that penetrates along the width direction of the battery module, and the wall surface of the notch includes a supporting surface and a limiting surface, the supporting surface faces the bottom of the battery box, and the limiting surface faces away from the battery cell; the bottom of the battery box body has a fixed beam, the supporting surface is supported on the fixed beam, the limiting surface faces the fixed beam, and a gap is formed between the fixed beam and the limiting surface.

[0031] In the embodiment of the present application, based on the setting of the notch on the fixed end plate, while achieving the support and fixation of the fixed end plate on the fixed beam, a separation is formed between the fixed beam and the battery cell, thereby forming a buffer space between the fixed end plate and the fixed beam after the battery cell expands, and at the same time avoiding the situation where the battery cell abuts against the edge of the fixed beam after expansion and deformation, thereby ensuring the safety of the battery cell after expansion and deformation.

[0032] According to one aspect of the present application, a power supply system is provided, comprising an electrical device and the energy storage device described in the above aspect, wherein the energy storage device supplies power to the electrical device.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0035] Figure 1 is a schematic diagram showing an energy storage system according to an exemplary embodiment.

[0036] Figure 2 FIG1 is a schematic diagram of an exploded structure of an energy storage device according to an exemplary embodiment.

[0037] Figure 3 FIG1 is a side view schematic diagram showing a battery module supported on a liquid cooling plate according to an exemplary embodiment.

[0038] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of area A in the middle.

[0039] Figure 5 yes Figure 3 Schematic diagram of the enlarged structure of area B in the middle.

[0040] Figure 6 FIG1 is a schematic diagram of an exploded structure of a battery module according to an exemplary embodiment.

[0041] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of area B.

[0042] Figure 8 FIG1 is a schematic side view of the structure of a battery module according to an exemplary embodiment.

[0043] Figure 9 yes Figure 6 Schematic diagram of the enlarged structure of area A in .

[0044] Figure 10 is a structural diagram of a power supply system according to an exemplary embodiment.

[0045] The description of the accompanying drawings is as follows:

[0046] 100. Energy storage device; 200. Electric energy conversion device; 300. High-voltage cable; 400. Power supply system; 410. Electrical equipment;

[0047] 10. Battery box; 20. Battery module;

[0048] 11. Lower box; 12. Box cover; 13. Liquid cooling plate; 14. Thermal adhesive; 15. Fixed beam;

[0049] 21. Fixed end plate; 22. Battery cell; 23. Sampling assembly; 24. Binding piece; 25. Ear plate; 26. Reinforcement plate; 27. Fixing hole;

[0050] 21a, top surface; 21b, bottom surface; 21c, side surface;

[0051] 211, lifting hole; 212, first reinforcing rib; 213, second reinforcing rib; 214, central area; 215, cushioning pad; 216, transition plate; 218, notch;

[0052] 2161, connecting hole; 2181, supporting surface; 2182, limiting surface; 2183, limiting groove;

[0053] 271, center hole; 272, offset hole; 273, edge hole;

[0054] 231. Isolation board. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0056] Since the energy people need is highly temporal and spatial, in order to make rational use of energy and improve utilization rate, it is necessary to use a medium or equipment to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0057] Currently, the generation of green electricity generally relies on photovoltaics, wind power, and hydropower. However, wind and solar energy are generally intermittent and highly volatile, which can cause grid instability, insufficient electricity during peak hours, and excessive electricity during off-peak hours. Unstable voltage can also damage electricity. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar power curtailment". To solve these problems, we must rely on energy storage. This means converting electrical energy into other forms of energy through physical or chemical means and storing them. When needed, this energy is converted into electrical energy and released. Simply put, energy storage is like a large "power bank", storing electricity when photovoltaic and wind energy are sufficient and releasing the stored electricity when needed.

[0058] Taking electrochemical energy storage as an example, this solution provides an energy storage device 100 for use in energy storage systems. The energy storage device 100 is equipped with a group of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, the electricity generated by wind and solar energy is stored in the chemical batteries. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0059] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, and power consumption side energy storage. The corresponding types of energy storage devices 100 include:

[0060] (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power supply on the power supply side, energy storage power stations can achieve load matching of electricity in time and space, enhance the ability to absorb renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy generation, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation.

[0061] (2) Energy storage containers used on the grid side are mainly used for peak load regulation, frequency regulation, and relief of grid congestion. They can realize peak load shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak load period, thereby achieving a balance between electricity production and consumption;

[0062] (3) Small energy storage cabinets used on the power consumption side, whose main functions are self-generation and self-use of electricity, peak-valley price arbitrage, capacity cost management, and improving power supply reliability. According to different application scenarios, energy storage on the power consumption side can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the power market that implements peak-valley electricity prices, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley electricity price arbitrage is achieved, reducing electricity costs. In addition, industrial enterprises that are subject to two-part electricity prices can use energy storage systems to store energy during low electricity consumption and discharge it during peak load, thereby reducing peak power and the maximum demand reported, and achieving the purpose of reducing capacity electricity charges. Household photovoltaic storage can improve the level of self-generation and self-use of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installation is driven. Considering that photovoltaic power generation occurs during the day, while user loads are generally higher at night, deploying energy storage can better utilize photovoltaic power, increasing self-generation and self-consumption while reducing electricity costs. Furthermore, energy storage is required for backup power in areas such as communication base stations and data centers.

[0063] In some embodiments, see Figure 1 , Figure 1 A schematic diagram of the structure of an energy storage system according to an embodiment of the present application Figure 1 , and this application Figure 1 The embodiment is described by taking the shared energy storage scenario on the power generation / distribution side as an example, but the energy storage device 100 of the present application is not limited to the energy storage scenario on the power generation / distribution side.

[0064] The present application provides an energy storage system, which includes: an energy storage device 100, an electric energy conversion device 200, and a high-voltage cable 300.

[0065] In some embodiments of the power generation side scenario, the power conversion device 200 may include a wind power conversion device. Since the power generated by wind power conversion is volatile, random, and intermittent, the unstable power output by the wind power conversion device can be stored in the energy storage device 100 by being connected to the grid. The energy storage device 100 is connected to the high-voltage cable 300 and outputs smooth power to the power distribution network for use, thereby achieving peak load regulation and frequency regulation and stable operation of the power grid. Alternatively, the wind power conversion device is always connected to the high-voltage cable 300, and the wind power is converted into electricity through the high-voltage cable 300 under normal power generation conditions. The electric energy output by the conversion device is supplied to the power consumption side of the distribution network, and when the current power load is low and the wind power conversion device generates excess power, the excess power will be stored in the energy storage device 100 first, reducing the wind and solar power abandonment rates and improving the problem of new energy power generation and consumption; and when the power load is high, the power grid issues a command to use the power stored in the energy storage device 100 in conjunction with the high-voltage cable 300 in a grid-connected mode to transmit the power to the power consumption side, providing peak regulation, frequency regulation, standby and other services for the power grid operation, giving full play to the peak regulation role of the power grid, promoting peak shaving and valley filling of the power grid, and alleviating the power supply pressure of the power grid.

[0066] In some embodiments on the distribution network side, the power conversion device 200 may include a photovoltaic power conversion device, and the energy storage device 100 is connected to the high-voltage cable 300 and installed between the downstream of the high-voltage cable 300 and the user load. The electric energy output by the photovoltaic power conversion device is stored in the energy storage device 100, which responds promptly to act as a backup power supply when a fault occurs in the power grid / distribution network; or, it can alleviate line congestion when a line congestion occurs in the high-voltage cable 300 transmission line, and provide power supply support when the power grid is planned to be expanded to delay the economic pressure caused by the expansion of the power grid / distribution network.

[0067] Optionally, the power conversion device 200 may include but is not limited to a wind power conversion device, a photovoltaic power conversion device, etc. The power conversion device 200 is used to convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0068] Optionally, the energy storage device 100 may include but is not limited to energy storage application scenarios such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems or temporary power supply systems, and may also be used in data centers, military equipment, aerospace, charging piles, electric vehicles and other fields.

[0069] Optionally, the energy storage device 100 may include, but is not limited to, a battery module composed of battery cells, a battery pack, a battery cluster, a mobile power supply, an energy storage cabinet / container, and other integrated battery systems. The energy storage device 100 provided in the embodiments of this application may be applied in practical applications such as, but not limited to, the products listed above. Other application forms are also possible. The embodiments of this application do not impose strict limitations on the application form of the energy storage device 100. The embodiments of this application illustrate the energy storage device 100 as a multi-cell battery.

[0070] Optionally, the battery cells included in the energy storage device 100 may be, but are not limited to, at least one of cylindrical batteries, square batteries, prismatic batteries, or batteries of other shapes. The battery cells may be secondary batteries, which are batteries that can be recharged to activate the active materials after discharge and continue to be used. The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and this application does not specifically limit this.

[0071] In some embodiments, as Figure 2 As shown, the energy storage device 100 includes a battery case 10 and a battery module 20 , and the battery module 20 is accommodated in the battery case 10 .

[0072] The number of battery modules 20 contained in the battery box 10 may be 4, 6, 8, etc., and the greater the number of battery modules 20, the higher the capacity of the energy storage device 100, thereby making it easier to meet market demand. Figure 2 As shown, the battery box 10 contains four battery modules 20 .

[0073] Among them, such as Figure 2 As shown, the battery box 10 includes a lower box 11 and a box cover 12, and the box cover 12 is fixedly connected to the lower box 11 to enclose a receiving cavity, which is used to receive the battery module 20. In addition, a liquid cooling plate 13 is provided at the bottom of the battery box 10 (i.e., the bottom of the lower box 11). Figure 3 As shown, the battery module 20 is supported on the liquid cooling plate 13 to achieve heat exchange between the battery module 20 and the liquid cooling plate 13, thereby ensuring cooling of the battery module 20. Figure 3 and Figure 4 As shown, a thermal conductive adhesive 14 may be filled between the battery module 20 and the liquid cooling plate 13 to ensure the heat conduction effect between the battery module 20 and the liquid cooling plate 13 while further limiting the position of the battery module 20 and ensuring the stability of the battery module 20.

[0074] Among them, such as Figure 3As shown, the battery module 20 includes two fixed end plates 21 arranged opposite to each other, and a plurality of battery cells 22 located between the two fixed end plates 21; the battery module 20 also includes a binding member 24 (such as a cable tie), etc., which is wrapped around the pair of fixed end plates 21 by the binding member 24 to achieve binding and fixing of the two fixed end plates 21 and the plurality of battery cells 22. In addition, as shown in FIG. Figure 3 and Figure 5 As shown, the fixed end plate 21 has multiple fixing holes 27 extending along the height of the battery case 10. Locking bolts (not shown) pass through the fixing holes 27 and are fixedly connected to the bottom of the lower case 11 to secure the battery module 20 within the battery compartment. Specifically, the bottom of the battery case 10 (i.e., the bottom of the lower case 11) has a fixed crossbeam 15, and the fixed end plate 21 is supported on the fixed crossbeam 15. The fixed end plate 21 is locked and fixed to the fixed crossbeam 15 by the locking bolts.

[0075] In the related art, the assembly of the energy storage device 100 is usually based on manpower to transfer multiple battery modules 20 into the battery box 10. This not only reduces the assembly efficiency of the energy storage device 100, but also easily causes the battery modules 20 to fall and collide, causing damage to the battery modules 20, thereby affecting the assembly yield of the energy storage device 100.

[0076] In the embodiment of this application, Figure 6 and Figure 7 As shown, the battery module 20 includes: fixed end plates 21, battery cells 22 and a sampling assembly 23. The two fixed end plates 21 are arranged opposite to each other, and an accommodating space is formed between the pair of fixed end plates 21. The top surfaces 21a of the two fixed end plates 21 are respectively provided with at least two ear plates 25, and the ear plates 25 have penetrating lifting holes 211; multiple battery cells 22 are arranged along the distribution direction of the two fixed end plates 21 and are located in the accommodating space between the two fixed end plates 21; the sampling assembly 23 is located at the top of the multiple battery cells 22 and is limited between the ear plates 25 on the two fixed end plates 21.

[0077] In the embodiment of the present application, an ear plate 25 is provided on the top surface 21a of the fixed end plate 21, and then based on the lifting holes 211 of the ear plates 25 on the two fixed end plates 21, the battery module 20 can be lifted and transported, thereby improving the transportation efficiency of the battery module 20. At the same time, based on the lifting holes 211, the risk of the hook falling off during lifting can be avoided, thereby reducing the risk of the battery module 20 falling and improving the lifting yield of the battery module 20. In addition, the assembly process of the battery module 20 is to first group the fixed end plate 21 and multiple battery cells 22, and then cover the sampling component 23 above the battery cell 22. At this time, the sampling component 23 can be limited based on the ear plates 25 on the two fixed end plates 21, thereby ensuring the installation yield of the sampling component 23 on the top of the battery cell 22 and improving the installation efficiency.

[0078] Among them, the battery cell 22 has a bottom surface 21b and a top surface 21a facing each other, and the top surface 21a of the battery cell 22 is the surface on which the explosion-proof valve is provided. The fixed end plate 21 also has a bottom surface 21b and a top surface 21a facing each other, and the top surface 21a of the fixed end plate 21 is the surface of the fixed end plate 21 located on the same side as the explosion-proof valve of the battery cell 22 in the height direction of the battery module 20.

[0079] In addition, the bottom surface 21b of the battery cell 22 may be flush with the bottom surface 21b of the fixed end plate 21, or the bottom surface 21b of the battery cell 22 may protrude from the bottom surface 21b of the fixed end plate 21; and in combination with the above-mentioned case where the liquid cooling plate 13 is provided at the bottom of the battery box 10, as Figure 4 As shown, when the bottom surface 21b of the battery cell 22 protrudes from the bottom surface 21b of the fixed end plate 21, the distance d1 between the battery cell 22 and the liquid cooling plate 13 is smaller than the distance d2 between the fixed end plate 21 and the liquid cooling plate 13, so as to ensure preferential contact between the battery cell 22 and the liquid cooling plate 13 or the thermal conductive adhesive 14, thereby ensuring the reliability of heat transfer between the battery cell 22 and the liquid cooling plate 13.

[0080] Furthermore, the top surfaces 21a of the two fixed end plates 21 can respectively have two lug plates 25, three lug plates 25, etc., so that based on the lifting holes 211 of four lug plates 25, six lug plates 25, or even more lug plates 25, the stability of the lifting of the battery module 20 and the stability of the position limiting of the sampling assembly 23 can be ensured. As for the lifting holes 211 on the lug plates 25, the lifting holes 211 can be passed through the lug plates 25 along the width direction of the battery module 20 to avoid interference with the hook when lifting the battery module 20, thereby improving the lifting efficiency of the battery module 20. Of course, the lifting holes 211 can also be passed through the lug plates 25 along the length direction of the battery module 20, etc., as long as they do not interfere with the assembly of the hook in the lifting holes 211.

[0081] In some embodiments, as Figure 7 or Figure 8 As shown, the surface of the fixed end plate 21 facing away from the battery cell 22 has a plurality of reinforcing plates 26 , and the plurality of reinforcing plates 26 form a plurality of grids.

[0082] In this way, based on the arrangement of multiple reinforcing plates 26 , it is convenient to improve the structural strength of the fixed end plate 21 while reducing the weight, thereby ensuring the reliability of the multiple battery cells 22 fixed between the two fixed end plates 21 , that is, ensuring the reliability of the battery module 20 .

[0083] In some embodiments, as Figure 7 or Figure 8 As shown, the surface of the fixed end plate 21 facing away from the battery cell 22 has a strip-shaped first reinforcing rib 212 ; the length direction of the first reinforcing rib 212 is parallel to the height direction of the battery module 20 , and the ear plate 25 is located on the extension line of the first reinforcing rib 212 .

[0084] In this way, based on the first reinforcing rib 212 arranged on the fixed end plate 21, it is convenient to improve the structural strength of the fixed end plate 21 along the height direction of the battery module 20 at the lifting position, thereby avoiding the fixed end plate 21 from being deformed due to the pulling force when the battery module 20 is lifted based on the lifting hole 211 on the ear plate 25. Especially with the setting of a high-capacity battery module 20, it avoids the situation where the fixed end plate 21 is pulled and deformed due to the overall weight of the battery module 20.

[0085] Among them, the first reinforcing rib 212 on the surface of the fixed end plate 21 corresponds one to one with the ear plate 25 on the top surface 21a of the fixed end plate 21, that is, each ear plate 25 is located on the extension line of the corresponding first reinforcing rib 212, thereby ensuring the structural strength of the fixed end plate 21 along the height direction of the battery module 20 at each lifting position, and ensuring the reliability of the lifting of the battery module 20.

[0086] In addition, in combination with the well grid formed by the plurality of reinforcing plates 26 described above, Figure 7 or Figure 8As shown, the length of the first reinforcing rib 212 is the dimension of the grid in the longitudinal direction of the first reinforcing rib 212, and the first reinforcing rib 212 is located in a grid adjacent to the ear plate 25; in this case, the two ends of the first reinforcing rib 212 are respectively connected to the two adjacent reinforcing plates 26 to ensure the overall structural strength of the fixed end plate 21. Alternatively, the first reinforcing rib 212 is composed of multiple collinear first sub-reinforcing ribs, and the length of each first sub-reinforcing rib is the dimension of the first reinforcing rib 212 in the longitudinal direction of the grid. In this case, the multiple first sub-reinforcing ribs are respectively located in multiple grids that are sequentially connected in the longitudinal direction of the first reinforcing rib 212; in this case, the two ends of each first sub-reinforcing rib are respectively connected to the two adjacent reinforcing plates 26 to ensure the overall structural strength of the fixed end plate 21.

[0087] In some embodiments, as Figure 7 and Figure 8 As shown, the fixed end plate 21 has a central area 214 , and a surface facing away from the battery cell 22 has a plurality of strip-shaped second reinforcing ribs 213 , and the plurality of second reinforcing ribs 213 are distributed at intervals within the central area 214 .

[0088] In this way, for battery cells 22 with a large width, by setting multiple second reinforcing ribs 213 in the central area 214 on the fixed end plate 21, the deformation tendency of the battery cell 22 in the central area 214 can be limited, so that the battery cell 22 tends to deform uniformly in the entire large surface area (that is, the entire surface facing the fixed end plate 21); that is, the extreme deformation of the battery cell 22 in the length direction of the battery module 20 can be avoided, so as to reduce the extreme extrusion of the fixed end plate 21.

[0089] The central region 214 refers to a region symmetrically extending equidistantly along the width of the battery module 20 with respect to the vertical centerline of the fixed end plate 21, and having a width greater than or equal to 0.25 and less than or equal to 0.5 relative to the width of the fixed end plate 21. In other words, the vertical centerline of the central region 214 coincides with the vertical centerline of the fixed end plate 21, and the ratio of the width of the central region 214 to the width of the fixed end plate 21 is greater than or equal to 0.25 and less than or equal to 0.5. For example, the ratio of the width of the central region 214 to the width of the fixed end plate 21 is 0.25, 0.28, 0.32, 0.36, 0.4, 0.44, 0.48, 0.50, etc.

[0090] The multiple second reinforcing ribs 213 located within the central region 214 can be spaced apart along the width of the battery module 20, i.e., the length of the second reinforcing ribs 213 is parallel to the height of the battery module 20; or they can be spaced apart along the height of the battery module 20, i.e., the length of the second reinforcing ribs 213 is parallel to the width of the battery module 20. When the multiple second reinforcing ribs 213 are spaced apart along the height of the battery module 20, the second reinforcing ribs 213 can effectively enhance the deformation resistance of the fixed end plate 21 along the width of the battery module 20, thereby ensuring the expansion-limiting strength of the battery cells 22.

[0091] In addition, in combination with the well grid formed by the plurality of reinforcing plates 26 described above, Figure 7 and Figure 8 As shown, the length of the second reinforcing rib 213 is the dimension of the well grid along the length of the second reinforcing rib 213, and the second reinforcing rib 213 is located within the well grid; in this case, the two ends of the second reinforcing rib 213 are respectively connected to two adjacent reinforcing plates 26 to ensure the overall structural strength of the fixed end plate 21. Alternatively, the second reinforcing rib 213 is composed of multiple collinear second sub-reinforcing ribs, and the length of each second sub-reinforcing rib is the dimension of the well grid along the length of the second reinforcing rib 213. In this case, the multiple second sub-reinforcing ribs are respectively located in multiple well grids that are sequentially connected along the length of the second reinforcing rib 213; in this case, the two ends of each second sub-reinforcing rib are respectively connected to two adjacent reinforcing plates 26 to ensure the overall structural strength of the fixed end plate 21.

[0092] The plurality of well grids with the second reinforcement ribs 213 in the central area 214 may be arranged as follows: Figure 8 The cross-shaped structure shown can, of course, also be a rectangular structure, etc. When the multiple wells with the second reinforcing ribs 213 are in a cross-shaped structure, the extreme deformation of the battery cell 22 in the corresponding central area 214 can be more effectively limited to ensure uniform deformation of the battery cell 22 over the entire large surface.

[0093] In some embodiments, as Figure 6 As shown, a buffer cotton 215 is provided on the side of the fixed end plate 21 facing the battery cell 22 to achieve elastic buffering between the battery cell 22 and the fixed end plate 21 based on the buffer cotton 215 while avoiding hard contact between the battery cell 22 and the fixed end plate 21.

[0094] The cushioning cotton 215 can be a whole layer setting, or it can be as follows Figure 6 As shown, two buffer cottons 215 are provided on the side of the fixed end plate 21 facing the battery cell 22. The length direction of the buffer cotton 215 is parallel to the width direction of the battery module 20, and the two buffer cottons 215 are respectively close to the top surface 21a and the bottom surface 21b of the fixed end plate 21.

[0095] In this way, by setting the two buffer cottons 215 at intervals, elastic buffering is achieved between the battery cell 22 and the fixed end plate 21 , and at the same time, the deformable gap of the battery cell 22 is increased based on the gap between the two buffer cottons 215 .

[0096] Among them, the top surface 21a and the bottom surface 21b of the fixed end plate 21 can refer to the above-mentioned definitions. In addition, when two buffer cottons 215 (i.e., including top buffer cotton 215 and bottom buffer cotton 215) are provided on the side of the fixed end plate 21 facing the battery cell 22, for the bottom buffer cotton 215 close to the bottom surface 21b of the fixed end plate 21, the bottom buffer cotton 215 can be set flush with the bottom surface 21b of the fixed end plate 21, or the bottom surface 21b of the fixed end plate 21 can be set to protrude from the bottom buffer cotton 215. In combination with the above-mentioned situation where there is a thermal conductive adhesive 14 between the battery module 20 and the liquid cooling plate 13, when the bottom surface 21b of the fixed end plate 21 protrudes from the bottom buffer cotton 215, the thermal conductive adhesive 14 can be reduced or even avoided from overflowing from the bottom of the battery cell 22 and spreading to the buffer cotton 215, and the bottom buffer cotton 215 solidifies due to aging and solidification of the thermal conductive adhesive 14, thereby ensuring the elastic reliability of the bottom buffer cotton 215 and reducing the negative impact on the safe expansion space of the battery cell 22.

[0097] For example, the spacing between the bottom cushioning cotton 215 and the bottom surface 21b of the fixed end plate 21 is greater than or equal to 5 mm. For example, the spacing between the bottom cushioning cotton 215 and the bottom surface 21b of the fixed end plate 21 is 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, etc.

[0098] In some embodiments, as Figure 4 and Figure 8 As shown, the bottom surface 21b of the fixed end plate 21 has a notch 218 that passes through the width direction of the battery module 20. The wall of the notch 218 includes a supporting surface 2181 and a limiting surface 2182. The direction of the supporting surface 2181 is the same as that of the bottom surface 21b of the fixed end plate 21, and the limiting surface 2182 faces away from the battery cell 22.

[0099] In combination with the battery box 10 described above, the support surface 2181 on the fixed end plate 21 faces the bottom of the battery box 10; and when the bottom of the battery box 10 has a fixed crossbeam 15, as shown in FIG. Figure 4 As shown, the supporting surface 2181 is supported on the fixed beam 15 , and the limiting surface 2182 faces the fixed beam 15 , with a gap formed between the limiting surface 2182 and the fixed beam 15 .

[0100] In this way, based on the setting of the notch 218 on the fixed end plate 21, while the fixed end plate 21 is supported and fixed on the fixed beam 15, a separation is formed between the fixed beam 15 and the battery cell 22, so that a buffer space is formed between the fixed end plate 21 and the fixed beam 15 after the battery cell 22 expands, and at the same time, it avoids the situation where the battery cell 22 abuts against the edge of the fixed beam 15 after expansion and deformation, thereby ensuring the safety of the battery cell 22 after expansion and deformation.

[0101] The spacing between the limiting surface 2182 on the fixed end plate 21 and the fixed crossbeam 15 can be set to be greater than or equal to 0.5 mm and less than or equal to 5 mm, so as to ensure a buffer space between the fixed end plate 21 and the fixed crossbeam 15 while saving the space occupied by the battery module 20 in the battery case 10, that is, to ensure the space utilization in the battery case 10. For example, the spacing between the limiting surface 2182 on the fixed end plate 21 and the fixed crossbeam 15 is 0.5 mm, 1 mm, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 mm, etc.

[0102] In the embodiment of the present application, as the capacity of the battery cell 22 increases, the number of fixing holes 27 of the fixed end plate 21 is greater than or equal to 3, thereby ensuring the stability of the fixed end plate 21 fixed to the bottom of the battery box 10 (i.e., the fixed beam 15) based on at least three fixing holes 27.

[0103] In some embodiments, the fixed end plate 21 has a plurality of fixing holes 27 that penetrate along the height direction of the battery module 20; Figure 5 、 Figure 7 and Figure 9 As shown, the multiple fixing holes 27 include a central hole 271, a pair of offset holes 272 and a pair of edge holes 273. The central hole 271, the pair of offset holes 272 and the pair of edge holes 273 are distributed along the width direction of the battery module 20. The pair of offset holes 272 is located between the pair of edge holes 273, and the central hole 271 is located between the pair of offset holes 272.

[0104] In this way, the five fixing holes 27 on the fixed end plate 21 ensure that the fixed end plate 21 is firmly fixed to the fixed crossbeam 15, thereby achieving stability in limiting the position of the battery cells 22 and preventing a battery cell 22 close to the fixed end plate 21 from pulling and dragging the liquid cooling plate 13 due to a large displacement after multiple battery cells 22 expand.

[0105] Among them, the center line of the center hole 271 coincides with the vertical center line of the fixed end plate 21, and the center hole 271 is located in the middle of a pair of offset holes 272 and in the middle of a pair of edge holes 273, that is, a pair of offset holes 272 and a pair of edge holes 273 are symmetrically distributed on both sides of the center hole 271, thereby ensuring the balance of the fixed end plate 21 on the fixed beam 15.

[0106] In some embodiments, as Figure 7 and Figure 9 As shown, the distance d3 between the offset hole 272 and the center hole 271 is smaller than the distance d4 between the offset hole 272 and the adjacent edge hole 273 , and the distance d5 between a pair of offset holes 272 is larger than the distance d4 between the offset hole 272 and the adjacent edge hole 273 .

[0107] This ensures that the fixed end plate 21, corresponding to the center portion of the large surface of the battery cell 22, is securely fixed to the fixed crossbeam 15. For example, the ratio of the distance d3 between the offset hole 272 and the center hole 271 to the width of the fixed end plate 21 is 20.7%, and the ratio of the distance d4 between the offset hole 272 and the adjacent edge hole 273 to the width of the fixed end plate 21 is 28.1%.

[0108] In some embodiments, as Figure 7 As shown, there is at least one group of transition plates 216 on the fixed end plate 21, and the multiple transition plates 216 of each group are arranged at intervals along the height direction of the battery module 20, and the transition plates 216 have connection holes 2161; each group of transition plates 216 corresponds to a fixed hole 27, and the connection holes 2161 of the multiple transition plates 216 of each group and the corresponding fixed holes 27 are coaxial holes.

[0109] In this way, through the setting of each group of transition plates 216, not only the fixing bolts in the fixing holes 27 are exposed, which facilitates improving the accuracy of assembling the fixing bolts in the fixing holes 27, but also the limiting effect of the fixing bolts by the transition plates 216 on the fixing bolts improves the stability of the fixing bolts in the fixed end plate 21.

[0110] In some embodiments, as Figure 6 As shown, the battery module 20 further includes a binding member 24 (such as a cable tie, etc.), which is wrapped around the two fixed end plates 21 to fix the multiple battery cells 22 between the two fixed end plates 21 .

[0111] Among them, the fixed end plate 21 has two side surfaces 21c that are parallel to the height direction of the battery module 20 and opposite to each other along the width direction of the battery module 20. The edges of the side surfaces 21c away from the battery cell 22 are set with arc chamfers. In this way, when the binding piece 24 is wrapped around the fixed end plate 21, it can avoid the binding piece 24 from receiving greater stress at the edges of the fixed end plate 21, thereby extending the service life of the binding piece 24.

[0112] In addition, if Figure 9 As shown, both side surfaces 21c of the fixed end plate 21 have limiting grooves 2183, and the binding parts 24 are limited in the limiting grooves 2183 on the fixed end plate 21. In this way, the binding parts 24 can be prevented from falling off from the fixed end plate 21, thereby ensuring the stability of the battery module 20; at the same time, based on the accommodation of the binding parts 24 by the limiting grooves 2183, when multiple battery modules 20 are placed in the battery box 10, interference between the binding parts 24 on two adjacent battery modules 20 can be avoided, so as to improve the space utilization in the battery box 10 after reducing the spacing between the battery modules 20.

[0113] In some embodiments, as Figure 6 As shown, the sampling assembly 23 includes an isolation plate 231 and a sampling circuit (not shown in the figure). The isolation plate 231 covers the multiple battery cells 22 , and the sampling circuit is limited on the isolation plate 231 .

[0114] Among them, the isolation plate 231 can be a plate-shaped structure made of insulating materials such as plastic plates to achieve insulation isolation between the sampling circuit and multiple battery cells 22; the sampling circuit is limited on the isolation plate 231 to avoid shaking of the sampling circuit when transporting the battery module 20. At the same time, the sampling circuit is connected to multiple battery cells 22 to achieve electrical parameter collection of multiple battery cells 22.

[0115] The energy storage device 100 further includes a battery management system, which is housed in the battery case 10 and is connected to a sampling circuit of the battery module 20 to obtain electrical parameters of each battery cell 22 in the battery module 20 , thereby monitoring the charge and discharge status of the battery cell 22 .

[0116] In combination with the above-mentioned positioning of the sampling assembly 23 by the ear plate 25, at this time, the isolation plate 231 of the sampling assembly 23 can be positioned between the ear plates 25 on the two fixed end plates 21, that is, the two side edges of the isolation plate 231 in the length direction of the battery module 20 are respectively in contact with the ear plates 25 on the two fixed end plates 21, so as to achieve positioning of the isolation plate 231, and further achieve positioning of the sampling assembly 23.

[0117] Among them, the ear plate 25 on the fixed end plate 21 can protrude from the surface of the isolation plate 231 away from the battery module 20. Of course, the end face of the ear plate 25 in the height direction of the battery module 20 can also be flush with the surface of the isolation plate 231 away from the battery cell 22, so as to ensure that the ear plate 25 limits the isolation plate 231 while avoiding the fixed end plate 21 from occupying a large space in the height direction of the battery module 20, thereby improving the space utilization in the battery box 10.

[0118] The present application also provides a power supply system 400, such as Figure 10 As shown, the power supply system 400 includes: an electrical device 410 and the energy storage device 100 described in the above embodiment. The energy storage device 100 is used to supply power to the electrical device 410. It is understood that the electrical device 410 is electrically connected to the energy storage device 100. Thus, combined with the above, during use, the power supply system 400 of the present application, based on the high assembly efficiency of the energy storage device 100, ensures the reliability of the energy storage device 100 in supplying power to the electrical device 410.

[0119] In the embodiments of the present application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0120] In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0121] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the implementation methods of this application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0122] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A battery module, characterized in that: include: Fixed end plates (21), wherein the two fixed end plates (21) are arranged opposite to each other, and an accommodating space is formed between the pair of fixed end plates (21), and at least two ear plates (25) are respectively provided on the top surfaces (21a) of the two fixed end plates (21), and the ear plates (25) have penetrating lifting holes (211); Battery cells (22), a plurality of the battery cells (22) are arranged along the distribution direction of the two fixed end plates (21) and are located in the accommodation space between the two fixed end plates (21); The sampling assembly (23) is located at the top of the plurality of battery cells (22) and is limited between the ear plates (25) on the two fixed end plates (21).

2. The battery module according to claim 1, wherein: The surface of the fixed end plate (21) facing away from the battery cell (22) has a strip-shaped first reinforcing rib (212); The length direction of the first reinforcing rib (212) is parallel to the height direction of the battery module (20), and the ear plate (25) is located on the extension line of the first reinforcing rib (212).

3. The battery module according to claim 1, wherein: The surface of the fixed end plate (21) facing away from the battery cell (22) has a plurality of reinforcing plates (26), and the plurality of reinforcing plates (26) form a plurality of well grids; The fixed end plate (21) has a central area (214), and a surface facing away from the battery cell (22) has a plurality of strip-shaped second reinforcing ribs (213), the plurality of second reinforcing ribs (213) are spaced apart in the central area (214), the vertical center line of the central area (214) coincides with the vertical center line of the fixed end plate (21), and the ratio between the width of the central area (214) and the width of the fixed end plate (21) is greater than or equal to 0.25 and less than or equal to 0.

5.

4. The battery module according to claim 3, wherein: The length direction of the second reinforcing rib (213) is parallel to the width direction of the battery module (20).

5. The battery module according to claim 3, wherein: The plurality of well grids with the second reinforcing ribs (213) in the central area (214) are in a cross-shaped structure.

6. The battery module according to claim 1, wherein: Two buffer cottons (215) are provided on one side of the fixed end plate (21) facing the battery cell (22); The length direction of the buffer cotton (215) is parallel to the width direction of the battery module (20), and two buffer cottons (215) are respectively close to the top surface (21a) and the bottom surface (21b) of the fixed end plate (21).

7. The battery module according to claim 6, wherein: The distance between the buffer cotton (215) of the two buffer cottons (215) close to the bottom surface (21b) of the fixed end plate (21) and the bottom surface (21b) of the fixed end plate (21) is greater than or equal to 5 mm.

8. The battery module according to claim 1, wherein: The sampling assembly (23) includes an isolation plate (231), and an end surface of the ear plate (25) in the height direction of the battery module (20) is flush with a surface of the isolation plate (231) facing away from the battery cell (22).

9. The battery module according to claim 1, wherein: The hanging hole (211) passes through the ear plate (25) along the width direction of the battery module (20).

10. The battery module according to any one of claims 1 to 9, wherein: The fixed end plate (21) has a plurality of fixing holes (27) penetrating along the height direction of the battery module (20); The plurality of fixing holes (27) include a central hole (271), a pair of offset holes (272), and a pair of edge holes (273); the central hole (271), the pair of offset holes (272), and the pair of edge holes (273) are distributed along the width direction of the battery module (20); the pair of offset holes (272) are located between the pair of edge holes (273), and the central hole (271) is located between the pair of offset holes (272).

11. The battery module according to claim 10, wherein: The distance between the offset hole (272) and the central hole (271) is smaller than the distance between the offset hole (272) and the adjacent edge hole (273), and the distance between a pair of the offset holes (272) is larger than the distance between the offset hole (272) and the adjacent edge hole (273).

12. The battery module according to claim 10, wherein: The fixed end plate (21) has at least one group of transition plates (216), and the multiple transition plates (216) of each group are arranged at intervals along the height direction of the battery module (20), and the transition plates (216) have connection holes (2161); Each group of transition plates (216) corresponds to one of the fixing holes (27), and the connection holes (2161) of the multiple transition plates (216) in each group and the corresponding fixing holes (27) are all coaxial holes.

13. The battery module according to any one of claims 1 to 9, wherein: The fixed end plate (21) has two side walls that are parallel to the height direction of the battery module (20) and opposite to each other along the width direction of the battery module (20), the edges of the side walls away from the battery cells (22) are arranged with arc chamfers, and both side walls of the fixed end plate (21) have limiting grooves (2183); The battery module (20) further includes a binding member (24), wherein the binding member (24) is wrapped around a pair of fixed end plates (21) and is positioned within the limiting groove (2183).

14. An energy storage device, characterized in that: It comprises a battery case (10) and a battery module (20) according to any one of claims 1 to 13, wherein the battery module (20) is accommodated in the battery case (10).

15. The energy storage device according to claim 14, wherein: A liquid cooling plate (13) is provided at the bottom of the battery box (10), the battery module (20) is supported on the liquid cooling plate (13), and the distance between the battery cell (22) and the liquid cooling plate (13) is smaller than the distance between the fixed end plate (21) and the liquid cooling plate (13).

16. The energy storage device according to claim 14, wherein: The bottom surface (21b) of the fixed end plate (21) has a notch (218) extending along the width direction of the battery module (20); the wall surface of the notch (218) includes a supporting surface (2181) and a limiting surface (2182); the supporting surface (2181) faces the bottom of the battery box, and the limiting surface (2182) faces away from the battery cell (22); The bottom of the battery box (10) has a fixed beam (15), the supporting surface (2181) is supported on the fixed beam (15), and the limiting surface (2182) faces the fixed beam (15) and forms a gap with the fixed beam (15).

17. A power supply system, characterized in that: The power supply system (400) includes an electrical device (410) and an energy storage device (100) according to any one of claims 14 to 16, and the energy storage device (100) supplies power to the electrical device (410).

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