Energy storage device and energy storage system

Abstract

The invention provides an energy storage device and an energy storage system, and relates to the technical field of energy storage. The energy storage device comprises a battery box body, a plurality of battery modules and a plurality of reinforcing pieces, the battery box body comprises a box cover and a lower box body, the lower box body comprises a liquid cooling plate and a plurality of side beams, and the box cover and the liquid cooling plate are connected to the two sides of the side beams and define a battery bin; the liquid cooling plate comprises a runner part and a non-runner part, and the non-runner part is located in the middle of the liquid cooling plate in the length direction of the battery box body; the plurality of battery modules are arranged in the battery bin and located on the runner parts, and the non-runner parts are located between the two adjacent battery modules in the length direction; the plurality of reinforcers are positioned on one side, deviating from the battery module, of the liquid cooling plate; the two ends of each reinforcing piece penetrate through the liquid cooling plate through the fixing pieces to be fixedly connected with the side beams, and the heat dissipation capacity is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to an energy storage device and an energy storage system. Background Art

[0002] In order to meet the market demand for long-life battery packs, current battery packs mostly adopt a high-capacity design. Multiple battery modules are usually installed in the battery box of the battery pack, but multiple battery modules will generate a lot of heat during the charging and discharging process.

[0003] However, the existing battery pack heat dissipation structure can no longer meet the heat dissipation requirements and poses a thermal safety risk. Therefore, it is necessary to improve the heat dissipation capacity of the battery pack.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a battery box, a battery pack and an energy storage system.

[0006] According to one aspect of the present disclosure, there is provided an energy storage device, the energy storage device comprising:

[0007] A battery box, comprising a box cover and a lower box, the lower box comprising a liquid cooling plate and a plurality of side beams, the box cover and the liquid cooling plate being connected to both sides of the plurality of side beams to enclose a battery compartment; the liquid cooling plate comprising a flow channel portion and a non-flow channel portion, the non-flow channel portion being located in the middle of the liquid cooling plate in the length direction of the battery box;

[0008] a plurality of battery modules, the plurality of battery modules being arranged in the battery compartment and located on the flow channel portion, the non-flow channel portion being located between two adjacent battery modules along the length direction;

[0009] A plurality of reinforcement members are located on a side of the liquid cooling plate away from the box cover; two ends of the plurality of reinforcement members are respectively fixedly connected to the side beam through fixing members passing through the liquid cooling plate.

[0010] In an exemplary embodiment of the present disclosure, the plurality of side beams include a first side beam and a second side beam spaced apart along the width direction, and a third side beam and a fourth side beam spaced apart along the length direction of the battery box, two ends of the first side beam are respectively connected to one end of the third side beam and the fourth side beam, and two ends of the second side beam are respectively connected to the other ends of the third side beam and the fourth side beam;

[0011] Two ends of the plurality of reinforcements are respectively fixedly connected to the first side beam and the second side beam through the fixing member through the liquid cooling plate.

[0012] In an exemplary embodiment of the present disclosure, the lower box body also includes an expansion beam, one end of the expansion beam is connected to the first side beam, and the other end is connected to the second side beam; in the length direction, the expansion beam is located between two adjacent battery modules, and corresponds to the position of the non-flow channel portion and at least one reinforcement member.

[0013] In an exemplary embodiment of the present disclosure, a receiving groove extending along the width direction is provided on a side of the expansion beam facing the liquid cooling plate, and an adhesive layer is provided in the receiving groove, and the adhesive layer is used to bond the expansion beam and the liquid cooling plate.

[0014] In an exemplary embodiment of the present disclosure, a step structure is provided on the first side beam and the second side beam, and extension portions are provided at both ends of the expansion beam; along the height direction of the battery box, the extension portions are located on the step surface of the step structure.

[0015] In an exemplary embodiment of the present disclosure, a protrusion is provided on one of the liquid cooling plate and at least one of the reinforcement members, and a depression is provided on the other one, wherein the protrusion is located in the depression.

[0016] In an exemplary embodiment of the present disclosure, the multiple reinforcements include a first reinforcement and multiple second reinforcements, the first reinforcement corresponds to the position of the non-flow channel portion, and the multiple second reinforcements correspond to the position of the flow channel portion; in the width direction of the battery box, the width of the first reinforcement is greater than the width of the second reinforcement.

[0017] In an exemplary embodiment of the present disclosure, along the width direction of the battery box, the first reinforcement member includes a middle section, avoidance sections located on both sides of the middle section, and a connecting section, wherein the connecting section is located on a side of the avoidance section away from the middle section;

[0018] The first reinforcement member includes a first reinforcement member body, on which a plurality of first reinforcement ribs protruding toward a side away from the liquid cooling plate are provided; the first reinforcement ribs extend along the width direction and are located on the middle section and the avoidance sections on both sides of the middle section.

[0019] In an exemplary embodiment of the present disclosure, the non-flow channel portion on the liquid cooling plate is recessed relative to the flow channel portion toward the box cover, and a protruding structure is formed on the first reinforcement body and is located between adjacent first reinforcement ribs along the length direction, and the protruding structure is located in the recessed non-flow channel portion.

[0020] In an exemplary embodiment of the present disclosure, the first reinforcement member body is further provided with a plurality of second reinforcement ribs protruding toward a side away from the liquid cooling plate, wherein the second reinforcement ribs extend along the length direction and are located on the middle section;

[0021] One end of the second reinforcing rib extends to the first reinforcing rib, and the other end extends to the edge of the first reinforcing member body.

[0022] In an exemplary embodiment of the present disclosure, the first reinforcement member body is further provided with a plurality of third reinforcement ribs protruding toward a side away from the liquid cooling plate, the third reinforcement ribs extending along the width direction and located on the connecting section;

[0023] Along the height direction of the battery box, the first reinforcement body corresponding to the connecting section sinks toward the liquid cooling plate relative to the first reinforcement body corresponding to the avoidance section, and the height of the second reinforcement rib relative to the liquid cooling plate is greater than the height of the third reinforcement rib relative to the liquid cooling plate.

[0024] In an exemplary embodiment of the present disclosure, the second reinforcement member includes a second reinforcement member body, and the second reinforcement member body is provided with a plurality of fourth reinforcement ribs, a fifth reinforcement rib, and a sixth reinforcement rib protruding toward a side away from the liquid cooling plate;

[0025] The fourth reinforcing ribs extend along the width direction of the battery box and are arranged at intervals along the length direction;

[0026] The fifth reinforcing rib extends along the length direction, with both ends of the fifth reinforcing rib located between adjacent fourth reinforcing ribs extending onto the fourth reinforcing rib, and one end of the fifth reinforcing rib located between the edge of the second reinforcing member body and the fourth reinforcing rib extending onto the fourth reinforcing rib, and the other end extending onto the edge of the second reinforcing member body;

[0027] An area between two opposite ends of the second reinforcement body is sunken toward one side of the liquid cooling plate, and the sixth reinforcement rib is located on the sunken area of ​​the end of the second reinforcement body.

[0028] In an exemplary embodiment of the present disclosure, a plurality of seventh reinforcing ribs protruding toward one side of the liquid cooling plate are provided on the second reinforcement body, a recessed area recessed toward one side of the liquid cooling plate is formed on the liquid cooling plate, and the plurality of seventh reinforcing ribs are located in the recessed area.

[0029] According to another aspect of the present disclosure, an energy storage system is further provided, which includes the above-mentioned energy storage device.

[0030] In the energy storage device provided by the present disclosure, a battery compartment is formed by connecting a box cover and a liquid cooling plate to two sides of multiple side beams. That is, the liquid cooling plate acts as a bottom plate, and the heat generated by the battery module can be directly discharged after heat exchange through the liquid cooling plate, avoiding heat conduction through the bottom plate, thereby improving the heat dissipation effect of the battery module; further, the battery module is located on the flow channel area of ​​the liquid cooling plate, which can further improve the heat exchange capacity between the liquid cooling plate and the battery module, thereby improving the heat dissipation effect of the battery module, so that when multiple battery modules are arranged in the battery box, the heat dissipation requirements of the energy storage device can be met. At the same time, the liquid cooling plate is a thin plate with an internal cavity. If its surface area is too large, the liquid cooling plate will sag and deform locally due to its own weight and the weight of the battery modules it carries. This deformation is particularly severe in the middle of the plate, which not only affects the structural stability of the liquid cooling plate, but also affects the effective contact area between the liquid cooling plate and the bottom of the battery module, thereby affecting the heat exchange between the liquid cooling plate and the battery module. Multiple reinforcements can enhance the strength of the liquid cooling plate, reduce deformation of the liquid cooling plate, and ensure efficient heat exchange between the liquid cooling plate and the battery module. By fixedly connecting the side beams to the liquid cooling plate and multiple reinforcements, the force generated by the expansion of the battery module can be distributed to the liquid cooling plate and multiple reinforcements through the side beams, thereby improving the structural strength of the battery case. Furthermore, by fixedly connecting the side beams to the liquid cooling plate and multiple reinforcements, the battery case can transmit and distribute the impact force through the reinforcements and side beams when subjected to external impact, reducing damage to the liquid cooling plate and battery modules and improving the reliability and safety of the battery case.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0033] Figure 1 A schematic diagram of an energy storage system provided in accordance with an embodiment of the present disclosure.

[0034] Figure 2 A schematic diagram of a battery pack provided in accordance with an embodiment of the present disclosure.

[0035] Figure 3 An exploded view of a battery pack according to an embodiment of the present disclosure.

[0036] Figure 4 A bottom view of a battery pack according to an embodiment of the present disclosure is provided.

[0037] Figure 5 A schematic diagram of a side beam provided for an embodiment of the present disclosure.

[0038] Figure 6 A schematic diagram of a side beam, an expansion beam, and a liquid cooling plate provided in accordance with an embodiment of the present disclosure.

[0039] Figure 7 An enlarged view of the connection position between the side beam and the expansion beam provided in one embodiment of the present disclosure.

[0040] Figure 8 A schematic diagram of an expansion beam provided in accordance with an embodiment of the present disclosure.

[0041] Figure 9 A schematic diagram of a liquid cooling plate provided in accordance with an embodiment of the present disclosure.

[0042] Figure 10 A schematic diagram of a first reinforcement member provided in accordance with an embodiment of the present disclosure.

[0043] Figure 11 A top view of a first reinforcement member provided for one embodiment of the present disclosure.

[0044] Figure 12 A schematic diagram of a second reinforcement member provided in accordance with an embodiment of the present disclosure.

[0045] Description of reference numerals:

[0046] 10. Energy storage device; 20. High-voltage cable; 30. First power conversion device; 40. Second power conversion device;

[0047] 100, battery pack; 110, battery box; 111, lower box; 1111, first side beam; 1112, second side beam; 1113, third side beam; 1114, fourth side beam; 1115, expansion beam; 11151, receiving groove; 11152, extension portion; 1116, step structure; 112, box cover; 1121, top cover; 1122, side wall; 113, liquid cooling plate; 1131, non-flow channel portion; 1132, recessed area; 114, sealing layer; 115, first panel; 116, second panel; 120, battery Cell module; 121, battery cell; 122, end plate; 130, reinforcement; 131, first reinforcement; 1310, first reinforcement body; 1311, middle section; 1312, avoidance section; 1313, connecting section; 1314, first reinforcement rib; 1315, second reinforcement rib; 1316, third reinforcement rib; 1317, raised structure; 132, second reinforcement; 1320, second reinforcement body; 1321, fourth reinforcement rib; 1322, fifth reinforcement rib; 1323, sixth reinforcement rib; 1324, seventh reinforcement rib. DETAILED DESCRIPTION

[0048] 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.

[0049] Since the energy people need is highly temporal and spatial, in order to make rational use of energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0050] 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.

[0051] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device 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 battery. When the use of external electricity reaches its peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0052] 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 include:

[0053] Large-scale energy storage stations used in wind and photovoltaic power plants can help renewable energy generation meet grid connection requirements while improving renewable energy utilization. As a high-quality active / reactive power source on the power supply side, energy storage stations achieve load matching in time and space, enhance renewable energy absorption capacity, reduce instantaneous power fluctuations, mitigate impacts 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.

[0054] Energy storage containers used on the grid side are mainly used for peak shaving, frequency regulation, and relief of grid congestion. They can achieve peak shaving and valley filling of electricity loads. That is, the energy storage batteries are charged during low load periods and the stored electricity is released during peak load periods, thus achieving a balance between electricity production and consumption.

[0055] Small energy storage cabinets used on the power consumption side primarily serve the purpose of self-generation and consumption, peak-valley price arbitrage, capacity cost management, and improved power supply reliability. Depending on the application scenario, power consumption-side energy storage can be categorized as industrial and commercial energy storage cabinets, household energy storage devices, and energy storage charging stations. These are typically used in conjunction with distributed photovoltaic systems. Industrial and commercial users can leverage energy storage for peak-valley price arbitrage and capacity cost management. In electricity markets with peak-valley electricity pricing, energy storage systems can be charged during low electricity prices and discharged during high electricity prices, leveraging peak-valley price arbitrage and reducing electricity costs. Furthermore, industrial enterprises subject to a two-part electricity pricing system can utilize energy storage systems to store energy during off-peak periods and discharge during peak load periods, thereby reducing peak power consumption and reported maximum demand, thereby lowering capacity charges. Residential photovoltaic power storage can enhance self-generation and self-consumption. High electricity prices and poor power supply stability are driving demand for residential photovoltaic installations. 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.

[0056] 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 using the shared energy storage scenario on the power generation / distribution side as an example, but the energy storage device of the present application is not limited to the energy storage scenario on the power generation / distribution side.

[0057] The present application provides an energy storage system, which includes: a high-voltage cable 20, a first power conversion device 30, a second power conversion device 40 and an energy storage device 10 provided by the present application. In some embodiments of the power generation side scenario, the second power conversion device 40 can be 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 10 by connecting to the grid. The energy storage device 10 is connected to the high-voltage cable 20 and outputs smooth power to the power distribution network for use, thereby realizing peak and frequency regulation and stable operation of the power grid; or, the wind power conversion device is always connected to the grid. The high-voltage cable 20 is connected. Under normal power generation conditions, the electric energy output by the wind power conversion device is supplied to the power distribution network through the high-voltage cable 20. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 10, reducing the wind and solar power abandonment rates and improving the problem of new energy power generation and consumption. When the power load is high, the power grid issues a command to transmit the power stored in the energy storage device 10 in conjunction with the high-voltage cable 20 in a grid-connected mode to the power distribution network for use, providing peak-shaving, frequency regulation, standby and other services for the power grid operation, giving full play to the peak-shaving 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.

[0058] In some embodiments on the distribution network side, the first power conversion device 30 can be a photovoltaic power conversion device, and the energy storage device 10 is connected to the high-voltage cable 20 and installed between the downstream of the high-voltage cable 20 and the user load. The electric energy output by the photovoltaic power conversion device is stored in the energy storage device 10, 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 20 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.

[0059] Optionally, the first electric energy conversion device 30 may include but is not limited to a wind power conversion device, and the second electric energy conversion device 40 may include but is not limited to a photovoltaic power conversion device. The first electric energy conversion device 30 and the second electric energy conversion device 40 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0060] Optionally, the energy storage device 10 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 is also used in data centers, military equipment, aerospace, charging piles, electric vehicles and other fields.

[0061] Optionally, the energy storage device 10 may include, but is not limited to, a single cell, or a battery module, battery pack, battery cluster, mobile power supply, energy storage cabinet / container, or other battery integrated system composed of single cells. The energy storage device 10 provided in the embodiments of this application may be applied in, but is not limited to, the products listed above, or in other application forms. The embodiments of this application do not impose strict limitations on the application form of the energy storage device 10.

[0062] Optionally, the battery cell may be, but is not limited to, at least one of a cylindrical battery, a square battery, a prismatic battery, or other shaped battery. The battery cell may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, or the like, and this application does not specifically limit this.

[0063] like Figure 2 and Figure 3 As shown, taking the energy storage device 10 as a battery pack 100 as an example, the battery pack 100 includes a battery case 110 and multiple battery modules 120. The battery case 110 includes a lower case 111 and a case cover 112, and the case cover 112 is fixedly / detachably connected to the lower case 111 to form a battery compartment; multiple battery modules 120 are located in the battery compartment.

[0064] The battery compartment of the battery box 110 may contain at least one battery module 120, such as one, two, four, five, six, seven, eight or more battery modules 120. The more battery modules 120 there are, the higher the capacity of the battery pack 100 is, making it easier to meet market demand. Figure 3 As shown, the battery compartment of the battery box 110 accommodates four battery modules 120 in two rows along the length direction X of the battery box 110 and in two columns along the width direction Y of the battery box 110 .

[0065] Among them, each battery module 120 may include a pair of end plates 122 arranged opposite to each other along the direction of battery cell arrangement, and a plurality of battery cells 121 located between the pair of end plates 122. The plurality of battery cells 121 and the pair of end plates 122 can be fixed by bundling tools such as cable ties. The plurality of battery cells 121 are arranged along the length direction X of the battery case, and the plurality of battery cells 121 are connected by battery cell connecting plates to realize series / parallel electrical connection between the plurality of battery cells 121.

[0066] Among them, multiple battery cells 121 are connected in series in sequence, and each battery cell connecting piece is respectively connected to the electrode terminals of different polarities on two battery cells 121; or, multiple battery cells 121 are connected in parallel in groups of two and then connected in series between groups. At this time, each battery cell connecting piece is first connected to the electrode terminals of the same polarity on two battery cells 121, and then connected to the electrode terminals of opposite polarity on the other two battery cells 121.

[0067] Multiple battery packs 100 can be centrally mounted on a cluster rack. The cluster rack typically includes a cluster rack frame and guide rails. The cluster rack frame has multiple mounting spaces, each of which is provided with a guide rail connected to the cluster rack frame. The battery packs 100 can be slidably mounted in the corresponding mounting space on the cluster rack via the guide rails.

[0068] like Figure 4 As shown, the lower box body 111 includes a liquid cooling plate 113 and a plurality of side beams. The liquid cooling plate 113 is located on one side of the plurality of side beams and is fixedly connected to the side beams. After the liquid cooling plate 113 is connected to the plurality of side beams, a storage space with an open end is formed. The box cover 112 is provided on the open end, that is, the box cover 112 and the liquid cooling plate 113 are connected to both sides of the plurality of side beams and enclose to form a battery compartment. The liquid cooling plate 113 includes a flow channel portion and at least one non-flow channel portion 1131. The flow channel portion is provided with a flow channel for the flow of coolant, and the non-flow channel portion 1131 is not provided with a flow channel. A plurality of battery modules 120 are provided in the battery compartment and are located on the flow channel portion. The non-flow channel portion 1131 is located between two adjacent battery modules 120 along the length direction X.

[0069] like Figure 4 As shown, the battery box 110 also includes a plurality of reinforcements 130, which are located on the side of the liquid cooling plate 113 away from the box cover 112; both ends of the plurality of reinforcements 130 are respectively fixedly connected to the side beams through the liquid cooling plate 113 via fixing members.

[0070] The battery pack 100 provided in the present disclosure has a battery compartment formed by a box cover 112 and a liquid cooling plate 113 connected to both sides of multiple side beams, that is, the liquid cooling plate 113 acts as a bottom plate, and the heat generated by the battery module 120 can be directly discharged after heat exchange through the liquid cooling plate 113, avoiding heat conduction through the bottom plate, thereby improving the heat dissipation effect of the battery module 120; further, the battery module 120 is located on the flow channel area of ​​the liquid cooling plate 113, which can further improve the heat exchange capacity between the liquid cooling plate 113 and the battery module 120, thereby improving the heat dissipation effect of the battery module 120, so that when multiple battery modules 120 are arranged in the battery box 110, the heat dissipation requirements of the battery pack 100 can be met. At the same time, the liquid cooling plate 113 is a thin plate with a hollow interior. Due to its large surface area, the liquid cooling plate 113 is subjected to its own weight and the weight of the battery module 120 it carries, causing it to sag and deform in some areas, especially in the middle. This not only affects the structural stability of the liquid cooling plate 113, but also affects the effective contact area between the liquid cooling plate 113 and the bottom of the module, thereby affecting the heat exchange between the liquid cooling plate 113 and the battery module 120. The multiple reinforcements 130 can enhance the strength of the liquid cooling plate 113, reduce deformation of the liquid cooling plate 113, and ensure efficient heat exchange between the liquid cooling plate 113 and the battery module 120. By fixedly connecting the side beams to the liquid cooling plate 113 and the multiple reinforcements 130, the force generated by the expansion of the battery module 120 can be distributed through the side beams to the liquid cooling plate 113 and the multiple reinforcements 130, thereby improving the structural strength of the battery housing 110. In addition, by fixing the side beams to the liquid cooling plate 113 and multiple reinforcements 130, when the battery box 110 is subjected to an external impact, the impact force can be transmitted and dispersed through the reinforcements 130 and the side beams, thereby reducing damage to the liquid cooling plate 113 and the battery module 120 and improving the reliability and safety of the battery box 110.

[0071] like Figure 5As shown, multiple side beams include a first side beam 1111 and a second side beam 1112 spaced apart along the width direction Y and a third side beam 1113 and a fourth side beam 1114 spaced apart along the length direction X of the battery box 110. The two ends of the first side beam 1111 are respectively connected to one end of the third side beam 1113 and the fourth side beam 1114, and the two ends of the second side beam 1112 are respectively connected to the other end of the third side beam 1113 and the fourth side beam 1114; the two ends of the multiple reinforcements 130 are respectively fixedly connected to the first side beam 1111 and the second side beam 1112 through fixing parts through the liquid cooling plate 113. The first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114 form a rectangular frame structure. When the battery box 110 is subjected to pressure, tension, or impact from different directions, the rectangular frame structure can distribute these external forces to the various side beams, preventing deformation or damage to the lower box 111, better protecting the battery cells within the battery pack 100, and improving the safety of the battery pack 100. The first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114 can be connected together by welding.

[0072] The side wall portion 1122 of the box cover 112 can be fixedly connected to the first side beam 1111 and the second side beam 1112 by screws. The side wall portion 1122 of the box cover 112 is connected to the first side beam 1111 and the second side beam 1112 by screws, for example, by providing a through hole on the side wall portion 1122 of the box cover 112, and providing threaded holes on the first side beam 1111 and the second side beam 1112. When the side wall portion 1122 of the box cover 112 is fixed to the first side beam 1111 and the second side beam 1112 by bolts and threaded holes, the locking force can be adjusted by screwing the bolts into the threaded holes. This also facilitates the subsequent separation of the box cover 112 from the lower box body 111, which is beneficial to the maintenance of the battery pack 100 in the later stage.

[0073] Among them, such as Figure 3 As shown, the lower box body 111 further includes a first panel 115 and a second panel 116. The first panel 115 is connected to the third side beam 1113, and the second panel 116 is connected to the fourth side beam 1114. The top cover portion 1121 of the box cover 112 is connected to the top of the first panel 115 by a screw at one end in the longitudinal direction X, and to the top of the second panel 116 by a screw at the other end; the side wall portion 1122 is connected to the side of the first panel 115 by a screw at one end in the longitudinal direction X, and to the side of the second panel 116 by a screw at the other end.

[0074] Among them, such as Figure 3As shown, a sealing layer 114 is provided between the box cover 112 and the lower box body 111. During the use of the battery pack 100, if external impurities enter the battery compartment, it will cause problems such as corrosion of the battery cells and degradation of insulation performance, seriously affecting the battery performance and service life. By providing the sealing layer 114, a reliable sealing barrier can be formed between the box cover 112 and the lower box body 111 to ensure the sealing of the battery compartment, prevent external moisture, dust and other impurities from entering the battery compartment, and protect the battery cells from the influence of the external environment. At the same time, the sealing layer 114 can also prevent the electrolyte inside the battery compartment from leaking, avoid safety accidents caused by electrolyte leakage, and improve the safety of the battery pack 100.

[0075] The liquid cooling plate 113 is bonded to the first side beam 1111 , the second side beam 1112 , the third side beam 1113 and the fourth side beam 1114 via an adhesive layer and fixedly connected via screws. The liquid cooling plate 113 is connected to the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 by using screw parts. For example, by providing a through hole on the liquid cooling plate 113, threaded holes are provided on the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114, and the liquid cooling plate 113 is fixed to the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 by using bolts and threaded holes. The locking force can be adjusted by the screwing depth of the bolts in the threaded holes, which also facilitates the subsequent separation of the liquid cooling plate 113 from the lower box body 111. When the liquid cooling plate 113 fails and needs to be repaired or replaced, it is only necessary to remove the screw parts to separate the liquid cooling plate 113 from the lower box body 111, which is beneficial to the later maintenance of the battery pack 100. By setting an adhesive layer between the liquid cooling plate 113 and the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 to bond them together, the gaps between the liquid cooling plate 113 and the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 after being fixedly connected by screws can be sealed, thereby improving the sealing of the battery compartment.

[0076] The adhesive layer between the liquid cooling plate 113 and the first, second, third, and fourth side beams 1111, 1112, 1113, and 1114 can be a coated or applied adhesive material. The adhesive layer can be distributed in an annular pattern on the first, second, third, and fourth side beams 1111, 1112, 1113, and 1114. This annular adhesive layer ensures a comprehensive seal between the liquid cooling plate 113 and the first, second, third, and fourth side beams 1111, 1112, 1113, and 1114, avoiding blind spots and ensuring the sealing of the battery compartment. This prevents moisture from entering the battery compartment and causing short circuits and explosions in electrical components. When the battery pack 100 is subjected to vibration or impact, the annular adhesive layer maintains a good seal, preventing local deformation that could lead to seal failure and ensuring that the battery pack 100 remains sealed and protected.

[0077] like Figure 6 As shown, the lower case 111 also includes an expansion beam 1115, one end of which is connected to the first side beam 1111 and the other end is connected to the second side beam 1112. The expansion beam 1115 corresponds to the position of the non-flow channel portion 1131. The provision of the expansion beam 1115 further enhances the structural strength of the lower case 111 in the width direction Y and provides additional support for the liquid cooling plate 113. When the battery module 120 expands, the force generated is transmitted to the expansion beam 1115, which can absorb this expansion force to a certain extent.

[0078] Among them, such as Figure 7 As shown, a receiving groove 11151 extending along the width direction Y is provided on the side of the expansion beam 1115 facing the liquid cooling plate 113. An adhesive layer is provided in the receiving groove 11151 for bonding the expansion beam 1115 to the liquid cooling plate 113. By providing the adhesive layer in the receiving groove 11151 and bonding the expansion beam 1115 to the liquid cooling plate 113 via the adhesive layer, the liquid cooling plate 113 and the lower case 111 are pre-fixed. The receiving groove 11151 formed on the expansion beam 1115 corresponds to the non-flow channel portion 1131 of the liquid cooling plate 113, avoiding the flow channel portion of the liquid cooling plate 113. This allows the force generated by the expansion of the battery module 120 to be more effectively transferred to the side beam connected to the expansion beam 1115, the non-flow channel portion 1131 of the liquid cooling plate 113, and the reinforcement plate, thereby reducing the impact on the flow channel portion of the liquid cooling plate 113.

[0079] Among them, such as Figure 8As shown, the first and second side beams 1111 and 1112 are provided with step structures 1116, and extensions 11152 are provided at both ends of the expansion beam 1115. Along the height direction Z of the battery case 110, the extensions 11152 are located on the stepped surfaces of the step structures 1116. The stepped surfaces at both ends of the expansion beam 1115 along the module width direction Y overlap and mate with the stepped surfaces formed by the first and second side beams 1111 and 1112 of the lower case 111, and are welded to each other, increasing the weld area and strengthening the connection strength of the expansion beam 1115. The step structures 1116 on the first and second side beams 1111 and 1112 can be formed by side beams.

[0080] Among them, such as Figure 9 As shown, the non-flow channel portion 1131 is located in the middle of the liquid cooling plate 113 along the longitudinal direction X of the battery case 110, that is, an expansion beam 1115 is provided in the middle of the longitudinal direction X of the battery case 110, and the expansion beam 1115 absorbs the expansion force generated by the battery module 120. Setting the non-flow channel portion 1131 in the middle of the liquid cooling plate 113 can specifically enhance the strength and rigidity of the middle part of the liquid cooling plate 113, and effectively disperse the stress in the middle position through the non-flow channel portion 1131, thereby preventing the liquid cooling plate 113 from being deformed or damaged in the middle position, and ensuring the smooth flow of the coolant in the flow channel. It can be understood that the area outside the non-flow channel portion 1131 on the liquid cooling plate 113 can be understood as the flow channel portion.

[0081] When assembling the liquid cooling plate 113, the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 of the lower box body 111 are welded and fixed in sequence, and then the middle expansion beam 1115 is welded and fixed to the side beams of the lower box body 111; then the welded side beam frame is turned over, and the grooves of the expansion beam 1115 are filled with adhesive, and the grooves formed by each side beam are also filled with adhesive; then the liquid cooling plate 113 is first bonded to the side beams of the lower box body 111 and the expansion beam 1115; then the liquid cooling plate 113 is connected to the side beams with bolts, and then the reinforcement plate is connected to the liquid cooling plate 113 and the side beams with bolts, and finally the battery box body 110 is turned over to place the battery module 120.

[0082] Specifically, one of the liquid cooling plate 113 and at least one reinforcement member 130 is provided with a raised portion, and the other is provided with a recessed portion, with the raised portion located within the recessed portion. By providing a matching concave-convex structure between the liquid cooling plate 113 and the reinforcement member 130, this concave-convex fit effectively prevents relative displacement between the reinforcement member 130 and the liquid cooling plate 113, ensuring that the reinforcement member 130 can continue to effectively reinforce the liquid cooling plate 113. Furthermore, by providing a matching concave-convex structure between the liquid cooling plate 113 and the reinforcement member 130, rapid positioning and assembly between the liquid cooling plate 113 and the reinforcement member 130 is facilitated, improving assembly precision and reducing assembly difficulty.

[0083] like Figure 4 As shown, the multiple reinforcement members 130 include a first reinforcement member 131 and multiple second reinforcement members 132. The first reinforcement member 131 corresponds to the position of the non-flow channel portion 1131, and the multiple second reinforcement members 132 correspond to the position of the flow channel portion. That is, the multiple second reinforcement members 132 are located on both sides of the first reinforcement member 131 along the length direction X. The combination of the first reinforcement member 131 and the multiple second reinforcement members 132 achieves comprehensive reinforcement of the liquid cooling plate 113. The first reinforcement member 131 is arranged corresponding to the non-flow channel portion 1131, and can cooperate with the expansion beam 1115 to focus on strengthening the central portion of the liquid cooling plate 113, improving the installation stability of the battery module 120, and fully utilizing its role in enhancing the strength and rigidity of the liquid cooling plate 113, effectively addressing the high stress in the central portion of the liquid cooling plate 113. The multiple second reinforcement members 132 are distributed on both sides of the first reinforcement member 131, further enhancing the overall strength and stability of the liquid cooling plate 113 along the length direction X. They disperse the stress transmitted from the first reinforcement 131 and simultaneously reinforce the sides of the liquid cooling plate 113, preventing deformation of the portion of the liquid cooling plate 113 supporting the battery module 120. The synergistic effect of the first reinforcement 131 and the second reinforcement 132 forms a continuous and stable reinforcement structure along the length direction X of the liquid cooling plate 113, effectively withstanding various external forces, ensuring the normal operation of the liquid cooling plate 113 and improving the reliability and safety of the battery case 110.

[0084] Among them, such as Figure 4As shown, in the width direction Y of the battery case 110, the width of the first reinforcement 131 is greater than the width of the second reinforcement 132. Since the first reinforcement 131 and the expansion beam 1115 need to be connected by bolts, that is, the expansion beam 1115 needs to be fixed by the first reinforcement 131, while the second reinforcement 132 only needs to be supported under the liquid cooling plate 113 to achieve reinforcement, the first reinforcement 131 with a relatively large width is used to improve its structural strength. In addition, when the first reinforcement 131 is locked and fixed to the expansion beam 1115, the fixing effect of the expansion beam 1115 can be improved. Of course, the width of the second reinforcement 132 can also be greater than or equal to the width of the second reinforcement 132, and this is not limited by the present disclosure.

[0085] Among them, such as Figure 10 and Figure 11 As shown, along the width direction Y of the battery case 110, the first reinforcement member 131 includes a middle section 1311, avoidance sections 1312 located on either side of the middle section 1311, and a connecting section 1313. The connecting section 1313 is located on the side of the avoidance section 1312 away from the middle section 1311. The first reinforcement member 131 includes a first reinforcement member body 1310, which is provided with a plurality of first reinforcement ribs 1314 protruding toward the side away from the liquid cooling plate 113. The first reinforcement ribs 1314 extend along the width direction Y and are located on the middle section 1311 and the avoidance sections 1312 on either side of the middle section 1311. The segmented design of the middle section 1311, avoidance section 1312, and connecting section 1313 allows the first reinforcement member 131 to better adapt to the structure and operating requirements of the battery case 110 while ensuring a reinforcing effect. The middle section 1311 corresponds to the non-flow channel portion 1131 and directly reinforces key areas of the liquid cooling plate 113. The avoidance section 1312 prevents interference with the flow channel of the liquid cooling plate 113. The connecting section 1313 is used to connect to the side beam, ensuring a tight connection between the first reinforcement member 131 and the overall structure of the battery case 110. Multiple first reinforcing ribs 1314 extending along the width direction Y and distributed throughout the middle section 1311 and avoidance section 1312 effectively disperse stress in the width direction Y, preventing deformation of the first reinforcement member 131 itself and ensuring its reinforcement of the liquid cooling plate 113.

[0086] Among them, such as Figure 9As shown, the non-flow channel portion 1131 of the liquid cooling plate 113 is recessed relative to the flow channel portion on the side facing the case cover 112. A protruding structure 1317 is formed on the first reinforcement body 1310 and positioned between adjacent first reinforcement ribs 1314 along the length direction X. The protruding structure 1317 is located within the recessed non-flow channel portion 1131. The non-flow channel portion 1131 of the liquid cooling plate 113 is recessed relative to the flow channel portion. By providing the protruding structure 1317 on the first reinforcement body 1310 and positioning the protruding structure 1317 within the recessed portion, the protruding structure 1317 supports the non-flow channel portion 1131, thereby providing support for the non-flow channel portion 1131.

[0087] Among them, such as Figure 10 and Figure 11 As shown, the first reinforcement member body 1310 is also provided with a plurality of second reinforcing ribs 1315 that protrude toward the side facing away from the liquid cooling plate 113. The second reinforcing ribs 1315 extend along the longitudinal direction X and are located in the middle section 1311. One end of the second reinforcing rib 1315 extends to the first reinforcing rib 1314, and the other end extends to the edge of the first reinforcement member body 1310. The provision of the second reinforcing ribs 1315 further enhances the strength and rigidity of the first reinforcement member 131 in the longitudinal direction X. The second reinforcing ribs 1315 extending along the longitudinal direction X are interconnected with the first reinforcing ribs 1314, forming a crisscrossing network of reinforcing ribs. This structure more effectively distributes and withstands stress from different directions. This prevents deformation of the first reinforcement member 131 in the longitudinal direction X, thereby ensuring its reinforcing effect on the central portion of the liquid cooling plate 113. Furthermore, the second reinforcing ribs 1315 extend to the edge of the first reinforcement member body 1310, further strengthening the structure of the entire first reinforcement member 131. Because the first reinforcement member 131 is in the form of a long, thin plate, the second reinforcement rib 1315 prevents twisting during the processing of the first reinforcement member 131, thereby improving the fit between the first reinforcement member 131 and the liquid cooling plate 113. Furthermore, to ensure the sealing of the battery compartment, the first reinforcement member 131 is tightly locked to the liquid cooling plate 113 and the expansion beam 1115. The first and second reinforcement ribs 1314 and 1315 are protruding toward the side facing away from the liquid cooling plate 113, forming an exhaust hole between the first reinforcement member 131 and the liquid cooling plate 113. This allows air to be discharged between the grooves of the first reinforcement member 131 and the liquid cooling plate 113 during the locking process, ensuring a tight fit between the reinforcement plate and the liquid cooling plate 113.

[0088] Among them, such as Figure 10 and Figure 11As shown, the first reinforcement body 1310 is further provided with a plurality of third reinforcement ribs 1316 that protrude toward the side away from the liquid cooling plate 113. The third reinforcement ribs 1316 extend along the width direction Y and are located on the connecting section 1313. Along the height direction Z of the battery housing 110, the first reinforcement body 1310 corresponding to the connecting section 1313 is lowered relative to the first reinforcement body 1310 corresponding to the avoidance section 1312, toward the liquid cooling plate 113. The height of the second reinforcement ribs 1315 relative to the liquid cooling plate 113 is greater than the height of the third reinforcement ribs 1316 relative to the liquid cooling plate 113. The lowered position of the connecting section 1313 relative to the avoidance section 1312 prevents deformation of the connecting section 1313 relative to the avoidance section 1312, thereby ensuring the reliability of the connection between the first reinforcement 131 and the side beam. The sunken design of the connecting section 1313 allows it to better fit with the liquid cooling plate 113, improving the tightness and stability of the connection; the different height settings of the second reinforcing ribs 1315 and the third reinforcing ribs 1316 enable the first reinforcing member 131 to reasonably distribute the strength at different parts according to the stress conditions. While ensuring the reinforcement effect, it optimizes the use of materials and reduces the weight of the first reinforcing member 131, which is conducive to achieving a lightweight design of the battery box 110.

[0089] like Figure 12 As shown, the second reinforcement 132 includes a second reinforcement body 1320, and the second reinforcement body 1320 is provided with a plurality of fourth reinforcement ribs 1321, fifth reinforcement ribs 1322 and sixth reinforcement ribs 1323 protruding toward the side away from the liquid cooling plate 113; the fourth reinforcement ribs 1321 extend along the width direction Y of the battery case 110 and are arranged at intervals along the length direction X; the fifth reinforcement ribs 1322 extend along the length direction X, and both ends of the fifth reinforcement ribs 1322 located between adjacent fourth reinforcement ribs 1321 extend to the fourth reinforcement ribs 1321, and one end of the fifth reinforcement rib 1322 located between the edge of the second reinforcement body 1320 and the fourth reinforcement rib 1321 extends to the fourth reinforcement rib 1321, and the other end extends to the edge of the second reinforcement body 1320; the area between the two opposite ends of the second reinforcement body 1320 sinks toward the liquid cooling plate 113, and the sixth reinforcement rib 1323 is located in the sunken area of ​​the end of the second reinforcement body 1320.

[0090] The arrangement of the fourth, fifth, and sixth reinforcing ribs 1321, 1322, and 1323 creates a rib network structure on the second reinforcement member 132. The fourth reinforcing rib 1321 extends along the width direction Y, dispersing stress along that direction. The fifth reinforcing rib 1322 extends along the length direction X and connects to the fourth reinforcing rib 1321, further enhancing the strength and rigidity of the second reinforcement member 132 in that direction, allowing it to better withstand external forces from various directions. The lowered ends of the second reinforcement member body 1320 and the arrangement of the sixth reinforcing rib 1323 enhance the fit between the second reinforcement member 132 and the liquid cooling plate 113, preventing deformation of the connecting section 1313 relative to the avoidance section 1312 and ensuring the reliability of the connection between the second reinforcement member 132 and the liquid cooling plate 113.

[0091] Among them, such as Figure 12 As shown, the second reinforcement member body 1320 is provided with a plurality of seventh reinforcement ribs 1324 that protrude toward one side of the liquid cooling plate 113. The liquid cooling plate 113 is formed with a recessed area 1132 that is recessed toward one side of the liquid cooling plate 113. The plurality of seventh reinforcement ribs 1324 are located in the recessed area 1132. The provision of the seventh reinforcement ribs 1324, and their location in the recessed area 1132 between the flow channel portions, improves the fit between the second reinforcement member 132 and the liquid cooling plate 113, thereby enhancing the reinforcement effect of the second reinforcement member 132 on the liquid cooling plate 113.

[0092] Among them, the first reinforcement 131 and the second reinforcement 132 can be stamped sheet metal structures, that is, the various reinforcement ribs, protrusions, depressions, sinks and other structures on the first reinforcement 131 and the second reinforcement 132 can be formed by stamping on the reinforcement 130 body, so that the first reinforcement 131 and the second reinforcement 132 are an integrally molded structure, which improves the structural strength of the first reinforcement 131 and the second reinforcement 132, thereby enhancing the reinforcement effect on the liquid cooling plate 113.

[0093] In the embodiments of the present disclosure, 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 disclosure can be understood according to specific circumstances.

[0094] In the description of the embodiments of the present disclosure, 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, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0095] Throughout this disclosure, 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 disclosed embodiments. 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.

[0096] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0097] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. An energy storage device, characterized in that: include: A battery box, comprising a box cover and a lower box, the lower box comprising a liquid cooling plate and a plurality of side beams, the box cover and the liquid cooling plate being connected to both sides of the plurality of side beams to enclose a battery compartment; the liquid cooling plate comprising a flow channel portion and a non-flow channel portion, the non-flow channel portion being located in the middle of the liquid cooling plate in the length direction of the battery box; a plurality of battery modules, the plurality of battery modules being arranged in the battery compartment and located on the flow channel portion, the non-flow channel portion being located between two adjacent battery modules along the length direction; A plurality of reinforcement members are located on a side of the liquid cooling plate away from the battery module; two ends of the plurality of reinforcement members are respectively fixedly connected to the side beam through fixing members passing through the liquid cooling plate.

2. The energy storage device according to claim 1, characterized in that The plurality of side beams include a first side beam and a second side beam spaced apart along the width direction of the battery box, and a third side beam and a fourth side beam spaced apart along the length direction, two ends of the first side beam are respectively connected to one end of the third side beam and the fourth side beam, and two ends of the second side beam are respectively connected to the other ends of the third side beam and the fourth side beam; Two ends of the plurality of reinforcements are respectively passed through the liquid cooling plate and fixedly connected to the first side beam and the second side beam via the fixing member.

3. The energy storage device according to claim 2, characterized in that The lower box body also includes an expansion beam, one end of which is connected to the first side beam, and the other end is connected to the second side beam; in the length direction, the expansion beam is located between two adjacent battery modules and corresponds to the position of the non-flow channel portion and at least one of the reinforcement members.

4. The energy storage device according to claim 3, characterized in that A receiving groove extending along the width direction is provided on a side of the expansion beam facing the liquid cooling plate. An adhesive layer is provided in the receiving groove, and the adhesive layer bonds the expansion beam and the liquid cooling plate.

5. The energy storage device according to claim 3, characterized in that A step structure is provided on the first side beam and the second side beam, and extension portions are provided at both ends of the expansion beam; along the height direction of the battery box, the extension portions are located on the step surface of the step structure.

6. The energy storage device according to claim 1, characterized in that A protrusion is provided on one of the liquid cooling plate and at least one of the reinforcement members, and a depression is provided on the other one, wherein the protrusion is located in the depression.

7. The energy storage device according to claim 1, characterized in that The multiple reinforcements include a first reinforcement and multiple second reinforcements, the first reinforcement corresponds to the position of the non-flow channel portion, and the multiple second reinforcements correspond to the position of the flow channel portion; in the width direction of the battery box, the width of the first reinforcement is greater than the width of the second reinforcement.

8. The energy storage device according to claim 7, characterized in that Along the width direction of the battery box, the first reinforcement member includes a middle section, avoidance sections located on both sides of the middle section, and a connecting section, wherein the connecting section is located on a side of the avoidance section away from the middle section; The first reinforcement member includes a first reinforcement member body, on which a plurality of first reinforcement ribs protruding toward a side away from the liquid cooling plate are provided; the first reinforcement ribs extend along the width direction and are located on the middle section and the avoidance sections on both sides of the middle section.

9. The energy storage device according to claim 8, characterized in that The non-flow channel portion on the liquid cooling plate is recessed relative to the flow channel portion toward the box cover, and a protruding structure is formed on the first reinforcement body and is located between adjacent first reinforcement ribs along the length direction. The protruding structure is located in the recessed non-flow channel portion.

10. The energy storage device according to claim 8, characterized in that: The first reinforcement body is further provided with a plurality of second reinforcement ribs protruding toward a side away from the liquid cooling plate, wherein the second reinforcement ribs extend along the length direction and are located on the middle section; One end of the second reinforcing rib extends to the first reinforcing rib, and the other end extends to the edge of the first reinforcing member body.

11. The energy storage device according to claim 10, characterized in that The first reinforcement body is further provided with a plurality of third reinforcement ribs protruding toward a side away from the liquid cooling plate, wherein the third reinforcement ribs extend along the width direction and are located on the connecting section; Along the height direction of the battery box, the first reinforcement body corresponding to the connecting section sinks toward the liquid cooling plate relative to the first reinforcement body corresponding to the avoidance section, and the height of the second reinforcement rib relative to the liquid cooling plate is greater than the height of the third reinforcement rib relative to the liquid cooling plate.

12. The energy storage device according to claim 7, characterized in that The second reinforcement member includes a second reinforcement member body, and the second reinforcement member body is provided with a plurality of fourth reinforcement ribs, a fifth reinforcement rib and a sixth reinforcement rib protruding toward a side away from the liquid cooling plate; The fourth reinforcing ribs extend along the width direction of the battery box and are arranged at intervals along the length direction; The fifth reinforcing rib extends along the length direction, with both ends of the fifth reinforcing rib located between adjacent fourth reinforcing ribs extending onto the fourth reinforcing rib, and one end of the fifth reinforcing rib located between the edge of the second reinforcing member body and the fourth reinforcing rib extending onto the fourth reinforcing rib, and the other end extending onto the edge of the second reinforcing member body; An area between two opposite ends of the second reinforcement body is sunken toward one side of the liquid cooling plate, and the sixth reinforcement rib is located on the sunken area of ​​the end of the second reinforcement body.

13. The energy storage device according to claim 12, characterized in that: The second reinforcement body is provided with a plurality of seventh reinforcement ribs protruding toward one side of the liquid cooling plate. A recessed area recessed toward one side of the liquid cooling plate is formed on the liquid cooling plate. The plurality of seventh reinforcement ribs are located in the recessed area.

14. An energy storage system, characterized in that: The energy storage device comprises the energy storage device according to any one of claims 1 to 13.

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