Energy storage device and power utilization system

Abstract

The application provides an energy storage device and a power utilization system. The energy storage device comprises a battery module, a liquid cooling assembly, a shell and a gas driving assembly. The liquid cooling assembly is arranged at the bottom of the battery module. The circulating air duct of the shell comprises a top air duct, a first side air duct, a bottom air duct and a second side air duct connected with each other. The top air duct is arranged at the side of the battery module away from the liquid cooling assembly. The bottom air duct is arranged at the side of the liquid cooling assembly away from the battery module. The gas driving assembly is arranged in the circulating air duct and is used for driving the airflow. The airflow enters the top air duct, exchanges heat with the battery module in a convection mode, enters the bottom air duct through the first side air duct, exchanges heat with the liquid cooling assembly, and then flows to the top air duct through the second side air duct after being cooled. The top and bottom of the battery module can both dissipate heat, which is beneficial to improving the heat dissipation efficiency of the energy storage device. The top of the battery module dissipates heat through air cooling, which can avoid the condensation and other problems caused by the contact between the aluminum busbar of the battery module and the liquid cooling structure, and improve the heat dissipation safety performance of the energy storage device.

Description

Technical Field

[0001] This application relates to the field of battery heat dissipation technology, specifically to an energy storage device and an electrical system. Background Technology

[0002] With the rapid development of the new energy industry, energy storage devices (such as lithium-ion battery energy storage systems) are increasingly widely used in energy storage, smart grids, and other fields. Among these, the battery module, as the core component of the energy storage device, consists of multiple arrayed cells that continuously generate a large amount of heat during operation. If this heat cannot be dissipated in time, it will lead to increased cell temperature and decreased uniformity, affecting not only the charging and discharging efficiency and lifespan of the energy storage device but also potentially triggering safety risks such as thermal runaway.

[0003] In related technologies, energy storage devices typically use air cooling or liquid cooling for heat dissipation. However, air cooling has poor heat dissipation effect, while liquid cooling is prone to problems such as condensation and leakage, resulting in low heat dissipation safety of energy storage devices. Utility Model Content

[0004] The purpose of this application is to provide an energy storage device and power system to solve the technical problems in the related art, where the heat dissipation effect of air cooling is poor and liquid cooling is prone to condensation and leakage, which reduce the safety of heat dissipation.

[0005] In a first aspect, this application provides an energy storage device, comprising: A battery module, the battery module comprising multiple battery cells, the multiple battery cells being arranged in an array; A liquid cooling assembly is fixedly mounted at the bottom of the battery module. A housing, the housing including a circulating air duct, the circulating air duct including a top air duct, a first side air duct, a bottom air duct and a second side air duct that are connected to each other, the top air duct being located on the side of the battery module away from the liquid cooling assembly, and the top air duct and the battery module being spaced apart, the bottom air duct being located on the side of the liquid cooling assembly away from the battery module; and A gas-driven assembly is disposed on the housing and within the circulating air duct. The gas-driven assembly is used to drive airflow to circulate within the circulating air duct. The airflow enters the top air duct and undergoes convective heat exchange with the battery module to raise its temperature. Subsequently, it enters the bottom air duct through the first side air duct and exchanges heat with the liquid cooling assembly to lower its temperature. After being cooled, the airflow flows back to the top air duct through the second side air duct.

[0006] In the energy storage device provided in this application, the battery module includes multiple arrayed cells, the liquid cooling component is fixedly disposed at the bottom of the battery module, and the circulating air duct of the housing includes a top air duct, a first side air duct, a bottom air duct and a second side air duct that are connected to each other. The top air duct is disposed on the side of the battery module away from the liquid cooling component, and the bottom air duct is disposed on the side of the liquid cooling component away from the battery module. The gas driving component is disposed on the housing and disposed in the circulating air duct. The gas driving component is used to drive the airflow to circulate in the circulating air duct. The airflow enters the top air duct and exchanges heat with the battery module through convection to raise the temperature. Then it enters the bottom air duct through the first side air duct and exchanges heat with the liquid cooling component to lower the temperature. The cooled airflow flows back to the top air duct through the second side air duct. Both the top and bottom of the battery module can dissipate heat, which helps to improve the heat dissipation efficiency of the energy storage device. In addition, the top of the battery module is equipped with a top air duct, which is spaced apart from the battery module. By dissipating heat from the top of the battery module through air cooling, problems such as condensation caused by the aluminum busbars of the battery module contacting the liquid cooling structure can be avoided, thus improving the heat dissipation safety performance of the energy storage device.

[0007] The battery module includes a first battery section and a second battery section disposed along a first direction; The top air duct includes a first air duct and a second air duct stacked together. The first air duct includes a first sub-air duct and a second sub-air duct that are arranged and connected along the first direction. The second air duct includes a third sub-air duct and a fourth sub-air duct that are arranged and connected along the first direction. The first sub-air duct and the third sub-air duct are arranged corresponding to the first battery unit, and the first sub-air duct is closer to the battery module than the third sub-air duct. The second sub-air duct and the fourth sub-air duct are arranged corresponding to the second battery unit, and the second sub-air duct is farther away from the battery module than the fourth sub-air duct.

[0008] The housing further includes multiple connecting pipes, which are respectively connected to the first sub-air duct and the second sub-air duct. The multiple connecting pipes are spaced apart to form a connecting gap, which is respectively connected to the third sub-air duct and the fourth sub-air duct.

[0009] The energy storage device further includes a plurality of first heat dissipation fins, which extend along the first direction and are disposed in the first sub-air duct. The plurality of first heat dissipation fins are connected to the first battery section and are used to dissipate heat from the first battery section. Alternatively, the energy storage device further includes a plurality of second heat dissipation fins, which are disposed within the fourth sub-air duct and extend along the first direction. The plurality of second heat dissipation fins are connected to the second battery section and are used to dissipate heat from the second battery section.

[0010] The energy storage device further includes a plurality of third heat dissipation fins, which extend along the first direction. A plurality of first heat dissipation fins are disposed in the bottom air duct. The plurality of third heat dissipation fins are connected to the liquid cooling assembly and are used to dissipate heat from the airflow.

[0011] The gas drive assembly includes a plurality of first fans and / or a plurality of second fans, wherein the plurality of first fans are used to apply thrust to the airflow in the circulating air duct, and the plurality of second fans are used to apply suction to the airflow in the circulating air duct.

[0012] The energy storage device further includes a heat spreader plate, which is disposed between the battery module and the plurality of first heat dissipation fins and the plurality of second heat dissipation fins, and the heat spreader plate is respectively connected to the battery module and the plurality of first heat dissipation fins and the plurality of second heat dissipation fins.

[0013] The distance between the plurality of first heat dissipation fins, the plurality of second heat dissipation fins, and the battery module is α, wherein α satisfies: α≥8mm.

[0014] The first heat dissipation fin includes at least one of straight fins, serrated fins, and louvered fins. Or, the second heat dissipation fin includes at least one of straight fins, serrated fins, and louvered fins; Or, the third heat dissipation fin includes at least one of straight fins, serrated fins, and louvered fins.

[0015] The liquid cooling assembly includes a liquid cooling plate, an inlet pipe, and an outlet pipe. The liquid cooling plate contains cooling liquid. The inlet pipe and the outlet pipe are respectively connected to the liquid cooling plate. The inlet pipe is used to input the cooling liquid, and the outlet pipe is used to output the cooling liquid.

[0016] Secondly, this application provides an electrical system, comprising: Electrical equipment; and The energy storage device is used to supply power to the electrical equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application. Figure 1 ; Figure 2 This is a schematic diagram of the cross-sectional structure of an energy storage device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the gas flow direction inside an energy storage device provided in an embodiment of this application; Figure 4 This is a schematic diagram of a battery module disposed in a liquid cooling assembly according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an energy storage device corresponding to the first air duct provided in an embodiment of this application; Figure 6 This is a structural schematic diagram of a second air duct corresponding to an energy storage device provided in an embodiment of this application; Figure 7 This is a structural schematic diagram of the connecting pipes and connecting gaps of an energy storage device provided in an embodiment of this application; Figure 8 This is a schematic diagram of an energy storage device structure provided in an embodiment of this application. Figure 2 ; Figure 9 This is a schematic diagram of the structure of an electrical system provided in an embodiment of this application.

[0018] Label Explanation: Power system 1000, power equipment 200, energy storage device 100, battery module 10, first battery section 11, second battery section 12, liquid cooling assembly 20, liquid cooling plate 21, liquid inlet pipe 22, liquid outlet pipe 23, housing 30, circulating air duct 40, first side air duct 41, top air duct 42, first air duct 421, first sub-air duct 4211, second sub-air duct 4212, second air duct 422, third sub-air duct 4221, fourth sub-air duct 4222, bottom air duct 43, second side air duct 44, connecting pipe 45, connecting gap 46, gas drive assembly 50, first fan 51, second fan 52, first heat dissipation fin 61, second heat dissipation fin 62, third heat dissipation fin 63, first direction D1, second direction D2. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0021] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of the constituent elements being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0022] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the meaning of these terms in this disclosure as appropriate.

[0023] With the rapid development of the new energy industry, energy storage devices (such as lithium-ion battery energy storage systems) are increasingly widely used in energy storage, smart grids, and other fields. Among these, the battery module, as the core component of the energy storage device, consists of multiple arrayed cells that continuously generate a large amount of heat during operation. If this heat cannot be dissipated in time, it will lead to increased cell temperature and decreased uniformity, affecting not only the charging and discharging efficiency and lifespan of the energy storage device but also potentially triggering safety risks such as thermal runaway.

[0024] In related technologies, energy storage devices typically use air cooling or liquid cooling for heat dissipation.

[0025] For air-cooled heat dissipation solutions, heat exchange is achieved by driving airflow through the surface of the battery module using a fan. However, due to the low specific heat capacity and limited heat exchange efficiency of air, it is difficult to quickly remove a large amount of heat when the battery module is operating at high power (such as fast charging or full-load discharging), resulting in insufficient heat dissipation capacity. In addition, the open air-cooling design makes it easy for external dust and moisture to enter the device, affecting the reliability of the battery cells and electrical components.

[0026] For liquid cooling solutions: Typically, liquid cooling components are only installed at the bottom of the battery module, with heat exchange achieved through contact between the coolant and the bottom of the module. However, this solution only dissipates heat from the bottom area of ​​the battery module. For the cells on the top and sides of the module, heat is difficult to effectively dissipate through the liquid cooling components, resulting in a large temperature difference between the top and bottom of the module. This can easily lead to "hot spots" in some cells, limiting overall heat dissipation efficiency. Furthermore, if the aluminum busbars at the top of the battery module (used for conductive connections between cells) are in direct contact with the liquid cooling structure or close to the low-temperature liquid cooling area, condensation can easily form on their surface due to a sudden drop in temperature when the ambient humidity is high. This poses a short-circuit risk and affects the safety of the device.

[0027] Please refer to Figures 1 to 4 This application provides an energy storage device 100 to solve the technical problems in the related art, where the heat dissipation effect of air cooling is poor and liquid cooling is prone to condensation and leakage, which reduce the safety of heat dissipation.

[0028] The energy storage device 100 includes a battery module 10, a liquid cooling component 20, a housing 30, and a gas-driven component 50. The battery module 10 includes multiple battery cells arranged in an array. The liquid cooling component 20 is fixedly disposed at the bottom of the battery module 10. The housing 30 includes a circulation duct 40, which includes a top duct 42, a first side duct 41, a bottom duct 43, and a second side duct 44 that are connected to each other. The top duct 42 is located on the side of the battery module 10 away from the liquid cooling component 20, and the top duct 42 and the battery module 10 are spaced apart. The bottom duct 43 is located on the side of the liquid cooling component 20 away from the battery module 10. The gas-driven component 50 is disposed on the housing 30 and within the circulating air duct 40. The gas-driven component 50 is used to drive the airflow to circulate within the circulating air duct 40. The airflow enters the top air duct 42 and undergoes convective heat exchange with the battery module 10 to raise its temperature. Subsequently, it enters the bottom air duct 43 through the first side air duct 41 and exchanges heat with the liquid cooling component 20 to lower its temperature. After being cooled, the airflow flows back to the top air duct 42 through the second side air duct 44.

[0029] The energy storage device 100 includes the battery module 10, which includes a plurality of battery cells, each being the smallest unit of energy storage. Optionally, the battery cells may be, but are not limited to, lithium iron phosphate cells or ternary lithium cells.

[0030] It should be noted that the capacity of a single battery cell is limited. In order to meet the power supply requirements of the power system, multiple battery cells in this application are arranged in an array (such as multiple rows and columns arranged closely) to form a module, which can maximize the use of space to increase energy storage capacity and ensure the consistency of current and temperature among the battery cells.

[0031] The energy storage device 100 also includes the liquid cooling component 20, which is fixed directly below the battery module 10. The liquid cooling component 20 can be used to absorb the heat of the battery module 10 and dissipate heat from the battery module 10. Furthermore, the bottom air duct 43 is located on the side of the liquid cooling component 20 away from the battery module 10. The liquid cooling component 20 can also be used to absorb the heat transferred by the airflow, thereby maintaining the stable operation of the battery mode and preventing the battery module 10 from degrading or failing due to overheating.

[0032] The liquid cooling component 20 is provided with the battery module 10 and the bottom air duct 43 on both sides, so that the liquid cooling component 20 can absorb heat from the airflow in the battery module 10 and the bottom air duct 43 at the same time, which can improve the utilization efficiency and heat dissipation efficiency of the liquid cooling component 20, thereby improving the thermal management performance of the energy storage device 100.

[0033] Furthermore, the liquid cooling assembly 20 includes a liquid cooling plate 21, an inlet pipe 22, and an outlet pipe 23. The liquid cooling plate 21 contains cooling liquid. The inlet pipe 22 and the outlet pipe 23 are respectively connected to the liquid cooling plate 21. The inlet pipe 22 is used to input the cooling liquid, and the outlet pipe 23 is used to output the cooling liquid.

[0034] The cooling liquid flows within the liquid cooling plate 21 and is a key carrier for heat transfer. Optionally, the cooling liquid includes, but is not limited to, water, ethylene glycol mixture (suitable for low-temperature scenarios, antifreeze and with good thermal conductivity), fluorinated liquid (for high-temperature or high-safety scenarios, non-conductive and flame-retardant), etc.

[0035] Specifically, the inlet pipe 22 is used to input the cooling liquid. After the cooling liquid absorbs the heat transferred by the airflow, the outlet pipe 23 discharges the cooling liquid and cools it through an external circulation system (such as a cooling tower). The cooled cooling liquid is then input again through the inlet pipe 22 to achieve the circulation of the cooling liquid.

[0036] The liquid cooling plate 21 has a serpentine flow channel inside, which can extend the residence time of the cooling liquid in the liquid cooling plate 21 and increase the heat exchange area. The liquid cooling plate 21 is fixed to the bottom of the battery module 10 and is in close contact with the battery module 10 to ensure that heat can be quickly conducted to the cooling liquid in the flow channel.

[0037] Optionally, the liquid cooling plate 21 may be made of, but is not limited to, metal or other materials with good thermal conductivity; this application does not impose any restrictions on this.

[0038] Furthermore, in one embodiment, a bonding element may also be provided between the liquid cooling plate 21 and the bottom of the battery module 10, such as a thermally conductive silicone grease, to reduce the contact thermal resistance between the battery module 10 and the liquid cooling plate 21 and improve the heat conduction efficiency.

[0039] The energy storage device 100 also includes the housing 30, which can be used to fix the battery module 10, the liquid cooling component 20, the gas driving component 50 and other components, to ensure the stability of each component, resist external impacts (such as transportation bumps, minor collisions), and extend the service life of the energy storage device 100.

[0040] Furthermore, the housing 30 is provided with a circulating air duct 40 for airflow, providing a directional flow path for the airflow and ensuring that heat can be accurately transferred from the battery module 10 to the liquid cooling component 20.

[0041] Further, the circulating air duct 40 includes the top air duct 42, the first side air duct 41, the bottom air duct 43, and the second side air duct 44. Specifically, the top air duct 42 is located directly above the battery module 10 (i.e., the side of the battery module 10 facing away from the liquid cooling component 20), directly facing the heated battery module 10; the bottom air duct 43 is located directly below the liquid cooling component 20 (i.e., the side of the liquid cooling component 20 facing away from the battery module 10), directly facing the low-temperature liquid cooling component 20; the first side air duct 41 and the second side air duct 44 are respectively located on both sides of the battery module 10, wherein the first side air duct 41 is a transition channel for airflow from the top air duct 42 to the bottom air duct 43, and the second side air duct 44 is a transition channel for airflow from the bottom air duct 43 to the top air duct 42.

[0042] The energy storage device 100 also includes the gas drive component 50, which is installed inside the housing 30 and located in the circulation duct 40. The gas drive component 50 serves as a power source for airflow circulation and can be used to drive airflow within the circulation duct 40.

[0043] The core of the heat dissipation of the energy storage device 100 is the circulation of air within the circulating air duct 40, continuously transferring heat from the battery module 10 to the liquid cooling component 20. It should be noted that the top air duct 42 and the battery module 10 are spaced apart, including but not limited to situations where the space between the top air duct 42 and the battery module 10 is connected or not connected. The following example exemplifies the connection between the top air duct 42 and the battery module 10 and should not be construed as a limitation of this application. The specific heat dissipation process of the energy storage device consists of four steps to form a complete heat dissipation closed loop: Step 1: Airflow absorbs heat (top air duct 42) After the gas-driven component 50 is activated, the cooler airflow first flows into the top air duct 42 (directly above the battery module 10). At this time, the battery module 10 is generating heat due to its operation, and the airflow directly convects and exchanges heat with the surface of the battery module 10, causing the airflow temperature to rise and simultaneously carrying away the heat from the battery module 10, resulting in an initial decrease in the temperature of the battery module 10.

[0044] Step 2: Airflow guidance (first side air duct 41) The airflow, having absorbed heat, is propelled by the gas-driven assembly 50 and flows downward through the first side air duct 41, guiding from the top of the energy storage device 100 to the bottom region where the liquid cooling assembly 20 is located.

[0045] Step 3: Airflow cooling (bottom air duct 43) The heat-absorbing airflow enters the bottom air duct 43 (directly below the liquid cooling component 20) and exchanges heat with the lower-temperature liquid cooling component 20: the liquid cooling component 20 continuously absorbs heat through its internal cooling liquid, so that the temperature of the higher-temperature airflow drops rapidly and becomes a lower-temperature airflow again.

[0046] Step 4: Airflow recirculation (second side air duct 44) The cooled airflow flows upward through the second side air duct 44 and returns to the top air duct 42, where it comes into contact with the battery module 10 again to absorb heat.

[0047] Thus, the airflow in the circulating air duct 40 completes a closed-loop cycle of heat absorption, flow guidance, cooling, and recirculation, and this process continues to ensure that the heat of the battery module 10 is continuously transferred to the liquid cooling component 20, maintaining the battery module 10 operating within a safe temperature range.

[0048] The liquid cooling component 20 is in direct contact with the bottom of the battery module 10. Utilizing the high specific heat capacity and high heat transfer coefficient of the cooling liquid, it quickly absorbs heat from the bottom of the battery module 10, preventing heat accumulation. The gas-driven component 50 drives airflow along the circulating air duct 40. The airflow in the top air duct 42 directly convects and exchanges heat with the top of the battery module 10, quickly absorbing heat from the top. Subsequently, as the airflow flows through the bottom air duct 43, it is cooled by the liquid cooling component 20. The cooled airflow then recirculates back to the top air duct 42, forming a closed loop of heat absorption, cooling, and re-heat absorption. In the energy storage device 100, both the top and bottom of the battery module 10 can dissipate heat, which helps improve the heat dissipation efficiency of the energy storage device 100. Furthermore, the top air duct 42 is provided on the top of the battery module 10. The top air duct 42 and the battery module 10 are spaced apart. By cooling the top of the battery module 10 with air, the problem of condensation caused by the aluminum busbar of the battery module 10 contacting the liquid cooling structure can be avoided, thereby improving the heat dissipation safety performance of the energy storage device 100.

[0049] Furthermore, the liquid cooling component 20 only needs to be arranged at the bottom of the battery module 10, without covering the top or sides of the battery module 10. This not only reduces the probability of leakage of the cooling liquid inside the liquid cooling component 20, but also reduces the amount of liquid cooling plate 21 and piping used, thus reducing the weight and cost of the liquid cooling component 20. The closed-loop design of the airflow circulating within the circulating air duct 40 can utilize the gap between the battery module 10 and the housing 30, without occupying a large amount of additional space, and there is no risk of airflow leakage, making the heat dissipation structure simpler and more reliable.

[0050] In the energy storage device 100 provided in this application, the battery module 10 includes a plurality of battery cells arranged in an array. The liquid cooling assembly 20 is fixedly disposed at the bottom of the battery module 10. The circulation air duct 40 of the housing 30 includes a top air duct 42, a first side air duct 41, a bottom air duct 43, and a second side air duct 44 that are connected to each other. The top air duct 42 is disposed on the side of the battery module 10 away from the liquid cooling assembly 20, and the bottom air duct 43 is disposed on the side of the liquid cooling assembly 20 away from the battery module. On one side of group 10, the gas-driven assembly 50 is disposed on the housing 30 and within the circulating air duct 40. The gas-driven assembly 50 drives the airflow to circulate within the circulating air duct 40. The airflow enters the top air duct 42 and undergoes convective heat exchange with the battery module 10, thus increasing its temperature. Subsequently, it enters the bottom air duct 43 via the first side air duct 41 and exchanges heat with the liquid cooling assembly 20 to decrease its temperature. After cooling, the airflow flows back to the top air duct 42 via the second side air duct 44. Both the top and bottom of the battery module 10 can dissipate heat, which helps improve the heat dissipation efficiency of the energy storage device 100. Furthermore, the top air duct 42 is provided on the top of the battery module 10, and the top air duct 42 and the battery module 10 are spaced apart. By dissipating heat from the top of the battery module 10 through air cooling, problems such as condensation caused by the aluminum busbars of the battery module 10 contacting the liquid cooling structure can be avoided, thus improving the heat dissipation safety performance of the energy storage device 100.

[0051] Furthermore, in one embodiment, a temperature sensor may be provided inside the liquid cooling assembly 20. The temperature sensor can be used to detect the temperature of the cooling liquid inside the liquid cooling plate 21, so as to adjust the flow rate, velocity and other parameters of the cooling liquid in real time according to the temperature, so that the liquid cooling assembly 20 can dynamically adapt to the heat dissipation requirements of the battery module 10. For example, when the battery module 10 is charging, the flow rate of the cooling liquid increases, and when the battery module 10 is in standby mode, the flow rate of the cooling liquid decreases.

[0052] In this embodiment, the airflow within the top air duct 42 absorbs and carries away the heat from the top of the battery module 10. This application uses the airflow along the first direction D1 as an example for illustration and should not be construed as a limitation of this application. Figure 3 As shown, the airflow proceeds from left to right. The first direction D1 is the width direction of the energy storage device 100 (e.g., ...). Figure 3 (As shown).

[0053] It should be noted that the airflow absorbs heat while flowing. When the airflow passes through 1 / 2 of the width of the battery module 10, the temperature can easily exceed 40°C. This causes the left side of the battery module 10 to be cooled by the low-temperature airflow and the right side to be heated by the high-temperature airflow. This can easily lead to a large temperature difference between the two sides of the battery module 10, which seriously affects the consistency and lifespan of the battery module 10.

[0054] Please refer to Figures 1 to 6 In one embodiment, the battery module 10 includes a first battery section 11 and a second battery section 12 disposed along a first direction D1.

[0055] The top air duct 42 includes a first air duct 421 and a second air duct 422 stacked together. The first air duct 421 includes a first sub-air duct 4211 and a second sub-air duct 4212 disposed and connected along the first direction D1. The second air duct 422 includes a third sub-air duct 4221 and a fourth sub-air duct 4222 disposed and connected along the first direction D1. The first sub-air duct 4211 and the third sub-air duct 4221 are disposed corresponding to the first battery section 11, and the first sub-air duct 4211 is closer to the battery module 10 relative to the third sub-air duct 4221. The second sub-air duct 4212 and the fourth sub-air duct 4222 are disposed corresponding to the second battery section 12, and the second sub-air duct 4212 is farther away from the battery module 10 relative to the fourth sub-air duct 4222.

[0056] The battery module 10 includes a first battery section 11 and a second battery section 12 disposed along a first direction D1, wherein the first battery section 11 is relatively close to the second side air duct 44, and the first battery is relatively close to the first side air duct 41.

[0057] The top air duct 42 includes a first air duct 421, which includes a first sub-air duct 4211 and a second sub-air duct 4212. The first sub-air duct 4211 is disposed corresponding to the first battery unit 11 and is close to the first battery unit 11. The airflow in the first sub-air duct 4211 performs convective heat exchange on the first battery unit 11, carrying away the heat from the first battery unit 11. The second sub-air duct 4212 is disposed corresponding to the second battery unit 12, but is far away from the second battery unit 12. In other words, the second sub-air duct 4212 and the second battery unit 12 are spaced apart. The second sub-air duct 4212 can be used to guide the hot airflow flowing out of the first sub-air duct 4211 and prevent the hot airflow from heating the second battery unit 12.

[0058] The top air duct 42 further includes a second air duct 422, which includes a third sub-air duct 4221 and a fourth sub-air duct 4222. The third sub-air duct 4221 is disposed corresponding to the first battery unit 11 and is located away from the first battery unit 11. In other words, the third sub-air duct 4221 and the first battery unit 11 are spaced apart. The third sub-air duct 4221 is used to guide the flow of cold air. The fourth sub-air duct 4222 is disposed corresponding to the second battery unit 12 and is close to the second battery unit 12. The airflow in the fourth sub-air duct 4222 performs convective heat exchange on the second battery unit 12, carrying away the heat from the second battery unit 12.

[0059] The first air duct 421 and the second air duct 422 are completely independent and have no airflow communication, thus achieving air medium separation. The core area of ​​the first battery unit 11 is covered by the sub-air duct (first sub-air duct 4211) of the first air duct 421, and the edge area is covered by the sub-air duct (third sub-air duct 4221) of the second air duct 422. The second battery unit 12 is the opposite, with the core area covered by the sub-air duct (fourth sub-air duct 4222) of the second air duct 422, and the edge area covered by the sub-air duct (second sub-air duct 4212) of the first air duct 421, so that the top air duct 42 forms a double-layer cross coverage.

[0060] Furthermore, the gas-driven assembly 50 simultaneously blows and guides airflow through the first air duct 421 and the second air duct 422. The airflow circulation is not a single path, but a closed loop where the two air ducts operate independently in parallel and synchronously, thus preventing the hot airflow from heating the second battery section 12. The specific process is as follows: 1. The gas drive assembly 50 simultaneously supplies gas to the first air duct 421 and the second air duct 422.

[0061] 2. The first air duct 421 circulates air.

[0062] The low-temperature airflow pushed by the gas-driven component 50 enters the first sub-air duct 4211 of the first air duct 421 (near the first battery section 11) from the second side air duct 44, and directly convects and exchanges heat with the top of the battery cell of the first battery section 11. After absorbing heat, the temperature rises (becoming a hot airflow). The hot airflow is separated and guided, and flows along the first air duct 421 into the second sub-air duct 4212 (away from the second battery section 12). The second sub-air duct 4212 does not contact the second battery section 12. The hot airflow is only transported in a direction and will not heat the second battery section 12. Cooling and recirculation: the hot air flows through the second sub-air duct 4212 to the first side air duct 41, then enters the bottom air duct 43, where it rapidly exchanges heat with the liquid cooling component 20 and cools down to a low-temperature airflow, before re-entering the second side air duct 44, thus completing the closed loop of the first air duct 421.

[0063] 3. Second air duct 422 airflow circulation.

[0064] The low-temperature airflow pushed by the gas-driven assembly 50 enters the third sub-airflow 4221 of the second airflow 422 (away from the second battery section 12) from the second side airflow 44 and flows along the edge of the first battery section 11. At this time, the airflow remains at a low temperature. The low-temperature airflow flows into the fourth sub-airflow 4222 (near the second battery section 12) along the second airflow 422, and directly convects and exchanges heat with the top of the battery cell of the second battery section 12. After absorbing heat, the temperature rises (becoming a hot airflow). Cooling and recirculation: The hot air flows through the fourth sub-air duct 4222 to the first side air duct 41, then enters the bottom air duct 43, where it rapidly exchanges heat with the liquid cooling component 20 and cools down to a low-temperature airflow, which then re-enters the second side air duct 44, completing the closed loop of the second air duct 422.

[0065] The airflow in the first air duct 421 and the second air duct 422 flows synchronously and exchanges heat independently. The first air duct 421 is responsible for heat dissipation of the first battery section 11, and the second air duct 422 is responsible for heat dissipation of the second battery section 12. This can prevent hot airflow from heating the latter half of the battery cell, reduce the temperature difference between the zones of the battery module 10, improve the temperature uniformity of the battery module 10, and thus improve the working stability and service life of the battery module 10.

[0066] Furthermore, the airflow in the first air duct 421 and the second air duct 422 flows synchronously. The first air duct 421 only needs to dissipate heat for the first battery section 11, and the second air duct 422 only needs to dissipate heat for the second battery section 12. The actual heat dissipation working path of the airflow in the two air ducts for the battery module 10 is half the size of the battery module 10, which can improve the heat dissipation efficiency of the energy storage device 100.

[0067] It should be noted that in this embodiment, the top air duct 42 is separated only twice. In other embodiments, if the width of the battery module 10 is large, the battery module 10 can be divided into n battery sections, and the separated air duct can be an n+1 layer air duct structure (n is a positive integer and n≥1). The n+1 layer air ducts are distributed at intervals along the height direction of the battery module 10, so that the air medium is separated n times during the airflow circulation process. This application does not limit this.

[0068] Please refer to Figures 1 to 7 In one embodiment, the housing 30 further includes a plurality of connecting pipes 45, which are respectively connected to the first sub-air duct 4211 and the second sub-air duct 4212. The plurality of connecting pipes 45 are spaced apart and form connecting gaps 46, which are respectively connected to the third sub-air duct 4221 and the fourth sub-air duct 4222.

[0069] The plurality of connecting pipes 45 are arranged sequentially along a second direction D2, wherein the second direction D2 is perpendicular to the first direction D1. The two ends of the connecting pipes 45 are respectively connected to the ends of the first sub-air duct 4211 (corresponding to the first battery unit 11) and the second sub-air duct 4212 (corresponding to the second battery unit 12), so that the airflow in the first air duct 421 can flow smoothly from the first sub-air duct 4211 into the second sub-air duct 4212.

[0070] The gaps between the multiple connecting pipes 45 form a connecting gap 46, the two ends of which are connected to the ends of the third sub-air duct 4221 (corresponding to the first battery unit 11) and the fourth sub-air duct 4222 (corresponding to the second battery unit 12), so that the airflow in the second air duct 422 can flow from the third sub-air duct 4221 into the fourth sub-air duct 4222.

[0071] The housing 30 includes multiple connecting pipes 45, which can disperse airflow pressure, avoid airflow congestion in a single channel, and ensure uniform airflow velocity within the first air duct 421. Furthermore, the number of connecting gaps 46 is also multiple, ensuring uniform airflow distribution in the second air duct 422 and preventing excessively high or low local flow velocities.

[0072] The physical separation between the connecting pipe 45 and the connecting gap 46 prevents airflow from mixing between layers. The airflow in both the first air duct 421 and the second air duct 422 changes direction at the same location. The connecting pipe 45 carries the airflow from the first air duct 421, while the connecting gap 46 carries the airflow from the second air duct 422. Furthermore, the connecting pipe 45 and the connecting gap 46 do not intersect, achieving independent airflow redirection within the same space. This design is both compact and efficient, ensuring that the second battery section 12 is always cooled by the low-temperature airflow.

[0073] Please refer to Figures 1 to 7In one embodiment, the energy storage device 100 further includes a plurality of first heat dissipation fins 61, which extend along the first direction D1 and are disposed within the first sub-air duct 4211. The plurality of first heat dissipation fins 61 are connected to the first battery section 11 and are used to dissipate heat from the first battery section 11.

[0074] Specifically, a plurality of the first heat dissipation fins 61 extend along the first direction D1 and are consistent with the airflow direction in the first sub-air duct 4211 (the airflow flows along the first direction D1), and the bottom of the first heat dissipation fins 61 is directly connected to the top of the cell or aluminum busbar of the first battery section 11.

[0075] After the cell of the first battery section 11 generates heat, it is quickly conducted through the first heat dissipation fins 61 in direct contact, preventing heat from accumulating inside the cell. The low-temperature airflow in the first sub-air duct 4211 flows along the first direction D1 and comes into full contact with the first heat dissipation fins 61 extending in the same direction. The multi-fin structure of the first heat dissipation fins 61 divides the airflow into multiple small airflows, increasing the contact area between the airflow and the first heat dissipation fins 61. At the same time, the narrow channels between the multiple first heat dissipation fins 61 accelerate the airflow velocity, enhance the convective heat transfer efficiency, and quickly remove the heat from the first heat dissipation fins 61.

[0076] Optionally, the material of the first heat dissipation fin 61 may include, but is not limited to, aluminum alloy or copper alloy or other materials with high thermal conductivity, to ensure that heat is quickly conducted from the battery cell to the first heat dissipation fin 61.

[0077] Further optionally, the first heat dissipation fin 61 may include, but is not limited to, at least one of straight fins, serrated fins, and louvered fins.

[0078] In one embodiment, the energy storage device 100 further includes a plurality of second heat dissipation fins 62, which are disposed within the fourth sub-air duct 4222 and extend along the first direction D1. The plurality of second heat dissipation fins 62 are connected to the second battery section 12 and are used to dissipate heat from the second battery section 12.

[0079] Specifically, a plurality of second heat dissipation fins 62 extend along the first direction D1 and are aligned with the airflow direction within the fourth sub-air duct 4222 (the airflow flows along the first direction D1), and the bottom of the second heat dissipation fins 62 is directly connected to the top of the cell or aluminum busbar of the second battery section 12.

[0080] After the cell of the second battery section 12 generates heat, it is quickly conducted through the second heat dissipation fins 62 in direct contact, preventing heat from accumulating inside the cell. The low-temperature airflow in the fourth sub-air duct 4222 flows along the first direction D1 and comes into full contact with the second heat dissipation fins 62 extending in the same direction. The multi-fin structure of the second heat dissipation fins 62 divides the airflow into multiple small airflows, increasing the contact area between the airflow and the second heat dissipation fins 62. At the same time, the narrow channels between the multiple second heat dissipation fins 62 accelerate the airflow velocity, enhance the convective heat transfer efficiency, and quickly remove the heat from the second heat dissipation fins 62.

[0081] Optionally, the material of the second heat dissipation fin 62 may include, but is not limited to, aluminum alloy or copper alloy or other materials with high thermal conductivity, to ensure that heat is quickly conducted from the battery cell to the second heat dissipation fin 62.

[0082] Further optionally, the second heat dissipation fin 62 may include, but is not limited to, at least one of straight fins, serrated fins, and louvered fins.

[0083] The top air duct 42 and the battery module 10 are spaced apart. In one embodiment, the distance between the plurality of first heat dissipation fins 61 and the plurality of second heat dissipation fins 62 and the battery module 10 is α, where α ≥ 8 mm. The distance α ≥ 8 mm between the plurality of first heat dissipation fins 61 and the plurality of second heat dissipation fins 62 and the battery module 10 avoids direct contact between the first heat dissipation fins 61, the second heat dissipation fins 62 and the aluminum busbars of the battery module 10, preventing condensation, short circuits, and other problems, thus improving the operational stability and safety of the battery module 10.

[0084] Optionally, the distance α between the plurality of first heat dissipation fins 61 and the plurality of second heat dissipation fins 62 and the battery module 10 can be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, or other values ​​greater than 8mm, and there is no limitation on this.

[0085] The top air duct 42 and the battery module 10 are spaced apart, please refer to Figures 1 to 7 In one embodiment, the energy storage device 100 further includes a heat spreader (not shown), which is disposed between the battery module 10 and the plurality of first heat dissipation fins 61 and the plurality of second heat dissipation fins 62, and the heat spreader is respectively connected to the battery module 10 and the plurality of first heat dissipation fins 61 and the plurality of second heat dissipation fins 62.

[0086] The heat spreader is sandwiched between the top of the battery module 10 and the bottom of the first heat dissipation fin 61 and the second heat dissipation fin 62. Specifically, the lower surface of the heat spreader is completely in contact with the top surface of the first battery section 11 and the second battery section 12 of the battery module 10 (covering all battery cells and aluminum busbars), while the upper surface is connected to the bottom of the first heat dissipation fin 61 and the second heat dissipation fin 62, forming a complete heat transfer path for the battery module 10, the heat spreader, the first heat dissipation fin 61 and the second heat dissipation fin 62.

[0087] The shape of the heat spreader is consistent with the top contour of the battery module 10 (covering the entire first battery section 11 and the second battery section 12 along the first direction D1). The heat spreader is extremely thin, which will not increase the space occupied by the top air duct 42, and can ensure close contact with the battery module 10 and the heat dissipation fins.

[0088] It should be noted that the heat spreader is a superconducting heat transfer element based on the phase change of the working fluid. Its core logic is to rapidly diffuse locally concentrated heat to the entire plate surface through a cycle of heat absorption by liquid working fluid evaporation and heat release by gaseous working fluid condensation. The specific process is as follows: Absorbing heat from the battery module 10 (evaporation stage): When the battery module 10 is working, if a cell in the first battery section 11 generates a local hot spot (the temperature is higher than the surrounding area) due to the difference in internal resistance, the lower surface of the heat spreader in that area will quickly absorb heat. The liquid working medium (usually water or ethanol) inside the heat spreader will evaporate at the hot spot and be converted into a gaseous working medium, while carrying away a large amount of heat.

[0089] Global heat diffusion (gas flow stage): The gaseous working fluid spontaneously flows to the lower temperature area inside the heat spreader (through microchannels or porous structure). For example, the hot spot heat of the first battery section 11 or the second battery section 12 will diffuse to the entire heat spreader through the gaseous working fluid, so that the temperature difference on the upper surface of the heat spreader is controlled within 1°C.

[0090] Heat is transferred to the first heat dissipation fin 61 and the second heat dissipation fin 62 (condensation stage): When the gaseous working fluid flows to the area on the upper surface of the heat exchange plate that contacts the first heat dissipation fins 61 and the second heat dissipation fins 62, the gaseous working fluid will condense into a liquid state because the first heat dissipation fins 61 and the second heat dissipation fins 62 are cooled by the low-temperature airflow (low temperature). The gaseous working fluid releases heat and transfers it to the first heat dissipation fins 61 and the second heat dissipation fins 62. The liquid working fluid then flows back to the evaporation zone through capillary force, forming a closed loop of evaporation-flow-condensation-recirculation, which continuously and efficiently transfers heat.

[0091] The heat spreader rapidly diffuses the heat from the hot spot through phase change heat transfer, and then evenly transfers it to the airflow through the first heat dissipation fins 61, ultimately reducing the maximum temperature difference of the first battery section 11. The same applies to the second battery section 12. With the layered air duct of the top air duct 42, the temperature difference of the entire battery module 10 can be controlled within 5°C.

[0092] Furthermore, the presence of aluminum busbars and cell gaps at the top of the battery module 10 makes it difficult for the heat dissipation fins to directly and tightly contact all heat-generating points. The heat spreader, by adhering to the battery module 10 over a large area, reduces contact thermal resistance and improves heat transfer efficiency. The first heat dissipation fins 61 and the second heat dissipation fins 62 can transfer heat to the airflow more quickly. Combined with the cooling effect of the bottom air duct 43, the overall heat dissipation response speed of the energy storage device 100 is improved, enabling it to quickly cope with sudden high-power heating of the battery module 10.

[0093] Localized hot spots are the core reason for accelerated cell aging and uneven capacity decay. The heat spreader, through its temperature equalization function, makes the operating temperature of all cells more uniform, synchronizes the chemical reaction rates during charging and discharging, significantly reduces the cell mismatch problem caused by temperature differences, and significantly extends the overall lifespan of the battery module 10.

[0094] Please refer to Figures 1 to 8 In one embodiment, the energy storage device 100 further includes a plurality of third heat dissipation fins 63, which extend along the first direction D1. A plurality of first heat dissipation fins 61 are disposed in the bottom air duct 43. The plurality of third heat dissipation fins 63 are connected to the liquid cooling assembly 20 and are used to dissipate heat from the airflow.

[0095] The bottom of the battery module 10 is tightly attached to the upper surface of the liquid cooling plate 21, and the lower surface of the liquid cooling plate 21 is fixedly connected to the upper surface of the third heat dissipation fin 63 to form a longitudinal heat exchange structure of battery module 10-liquid cooling plate 21-third heat dissipation fin 63. The upper surface of the liquid cooling plate 21 can be used to dissipate heat and cool the battery module 10, and the lower surface of the liquid cooling plate 21 can be combined with the third heat dissipation fin 63 to cool the airflow in the bottom air duct 43, thereby improving the overall utilization efficiency of the liquid cooling plate 21.

[0096] The core function of the third heat dissipation fin 63 is to enhance the heat exchange efficiency between the liquid cooling component 20 and the airflow in the bottom air duct 43, ensuring that the hot airflow after heat absorption is sufficiently cooled before entering the circulation, and providing a low-temperature air source for the top air duct 42.

[0097] Specifically, the third heat dissipation fin 63 is disposed within the bottom air duct 43 (the side of the liquid cooling assembly 20 away from the battery module 10, i.e., the channel between the liquid cooling assembly 20 and the bottom of the housing 30), and extends along the first direction D1, consistent with the airflow direction within the bottom air duct 43. This results in low airflow resistance and does not increase the energy consumption of the gas-driven assembly 50. Multiple third heat dissipation fins 63 are directly connected to the outer surface of the liquid cooling assembly 20 (such as the bottom of the liquid cooling plate 21), ensuring that the low temperature of the liquid cooling assembly 20 can be quickly conducted to the third heat dissipation fins 63.

[0098] Furthermore, the height of the third heat dissipation fin 63 is matched with the height of the bottom air duct 43 (approximately equal to the distance from the liquid cooling component 20 to the bottom of the housing 30), ensuring that the airflow does not circulate around the bottom air duct 43 and must make full contact with the third heat dissipation fin 63.

[0099] The hot airflow (which has absorbed the heat from the first battery section 11 and the second battery section 12) flowing out of the first airflow 421 and the second airflow 422 of the top airflow 42 enters the bottom airflow 43 through the first side airflow 41. At this time, the airflow temperature is high and needs to be cooled by the liquid cooling component 20 before it can be circulated back to the top airflow 42 through the second side airflow 44.

[0100] The third heat dissipation fin 63 is directly connected to the liquid cooling assembly 20. Low temperature is quickly conducted to the entire fin structure through the third heat dissipation fin 63. At this time, the third heat dissipation fin 63 becomes a low temperature carrier, and its surface area is several times that of the outer surface of the liquid cooling assembly 20, which greatly improves the contact efficiency with the hot airflow.

[0101] Furthermore, when the hot airflow flows through the bottom air duct 43 along the first direction D1, it is divided into multiple fine airflows by the multiple third heat dissipation fins 63. Each airflow is in full contact with the surface of the low-temperature third heat dissipation fins 63. The heat in the airflow is transferred to the third heat dissipation fins 63 through convection, and then conducted to the liquid cooling assembly 20 by the third heat dissipation fins 63, and finally carried away by the cooling liquid.

[0102] The multiple third heat dissipation fins 63 can amplify the cooling capacity of the liquid cooling component 20. By increasing the contact area with the hot airflow, the liquid cooling component 20 can more efficiently remove heat from the airflow, ensuring that the temperature of the airflow entering the circulation is low enough.

[0103] Optionally, the material of the third heat dissipation fin 63 may include, but is not limited to, aluminum alloy or copper alloy or other materials with high thermal conductivity, to ensure that heat is quickly conducted from the airflow to the second heat dissipation fin 62.

[0104] Further optionally, the third heat dissipation fin 63 may include, but is not limited to, at least one of straight fins, serrated fins, and louvered fins.

[0105] Please refer to Figures 1 to 8 In one embodiment, the gas drive assembly 50 includes a plurality of first fans 51 and / or a plurality of second fans 52, the plurality of first fans 51 being used to apply thrust to the airflow within the circulation duct 40, and the plurality of second fans 52 being used to apply suction to the airflow within the circulation duct 40.

[0106] The gas drive assembly 50 includes a plurality of first fans 51 and / or a plurality of second fans 52. In other words, in one embodiment, the gas drive assembly 50 may include only a plurality of first fans 51; in another embodiment, the gas drive assembly 50 may include only a plurality of second fans 52; and in yet another embodiment, the gas drive assembly 50 may include a plurality of first fans 51 and a plurality of second fans 52.

[0107] When the gas-driven assembly 50 may include a plurality of first fans 51 and a plurality of second fans 52, the plurality of first fans 51 and the plurality of second fans 52 are respectively disposed at both ends of the energy storage device 100 along a first direction D1. That is, the plurality of first fans 51 and the plurality of second fans 52 are respectively installed at the two ends of the energy storage device 100 along the first direction D1 (for example, the first fan 51 is at the left end and the second fan 52 is at the right end), and are all embedded in the inlet / outlet area of ​​the circulating air duct 40. Specifically, the first fan 51 is disposed at the connection node of the second side air duct 44 and the top air duct 42, and the second fan 52 is disposed at the connection node of the first side air duct 41 and the top air duct 42.

[0108] Multiple first fans 51 at the left end operate synchronously, applying directional thrust into the circulation duct 40. These first fans 51 are positioned corresponding to the first duct 421 and the second duct 422, driving low-temperature airflow into both ducts. Simultaneously, multiple second fans 52 at the right end operate synchronously, creating negative pressure suction within the circulation duct 40. These second fans 52 are also positioned corresponding to the first duct 421 and the second duct 422, driving low-temperature airflow from both ducts into the first side duct 41.

[0109] The gas-driven assembly 50 includes a plurality of first fans 51 and a plurality of second fans 52. The plurality of first fans 51 are used to apply thrust to the airflow in the circulation duct 40, and the plurality of second fans 52 are used to apply suction to the airflow in the circulation duct 40. This can prevent airflow attenuation along the way and ensure uniform heat exchange throughout the energy storage device 100.

[0110] Furthermore, the combined push and suction power mode using different fans is more energy-efficient than a single fan drive. Under the same airflow, the combined push and suction force can reduce the power of a single fan. At the same time, the multi-fan redundancy design significantly improves system reliability and avoids thermal collapse caused by single-point fan failure.

[0111] Please refer to Figures 1 to 9 , Figure 9 This is a schematic diagram of the structure of an electrical system provided in an embodiment of this application.

[0112] This application also provides an electrical system 1000, which includes an electrical device 200 and an energy storage device 100, wherein the energy storage device 100 is used to supply power to the electrical device 200.

[0113] In this embodiment, the energy storage device 100 has high safety performance, so that when the energy storage device 100 is applied to the power system 1000, it can provide a stable power supply to the power equipment 200, so that the power system 1000 can work stably.

[0114] The power supply system 1000 in this application embodiment can be, but is not limited to, portable electronic devices such as mobile phones, tablets, laptops, desktop computers, smart bracelets, smartwatches, e-readers, and game consoles. It can also be a vehicle such as a car, truck, sedan, van, freight train, high-speed train, or electric vehicle. Furthermore, it can be various household appliances.

[0115] It is understood that the power system 1000 described in this embodiment is merely one form of the power system 1000 used by the energy storage device 100, and should not be construed as a limitation on the power system 1000 provided in this application, nor should it be construed as a limitation on the power system 1000 provided in various embodiments of this application.

[0116] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0117] The above description represents some embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An energy storage device, characterized in that, include: A battery module, the battery module comprising multiple battery cells, the multiple battery cells being arranged in an array; A liquid cooling assembly is fixedly mounted at the bottom of the battery module. The housing includes a circulating air duct, which includes a top air duct, a first side air duct, a bottom air duct, and a second side air duct that are connected to each other. The top air duct is located on the side of the battery module away from the liquid cooling assembly, and the top air duct and the battery module are spaced apart. The bottom air duct is located on the side of the liquid cooling assembly away from the battery module. as well as A gas-driven assembly is disposed on the housing and within the circulating air duct. The gas-driven assembly is used to drive airflow to circulate within the circulating air duct. The airflow enters the top air duct and undergoes convective heat exchange with the battery module to raise its temperature. Subsequently, it enters the bottom air duct through the first side air duct and exchanges heat with the liquid cooling assembly to lower its temperature. After being cooled, the airflow flows back to the top air duct through the second side air duct.

2. The energy storage device according to claim 1, characterized in that, The battery module includes a first battery section and a second battery section disposed along a first direction; The top air duct includes a first air duct and a second air duct stacked together. The first air duct includes a first sub-air duct and a second sub-air duct that are arranged and connected along the first direction. The second air duct includes a third sub-air duct and a fourth sub-air duct that are arranged and connected along the first direction. The first sub-air duct and the third sub-air duct are arranged corresponding to the first battery unit, and the first sub-air duct is closer to the battery module than the third sub-air duct. The second sub-air duct and the fourth sub-air duct are arranged corresponding to the second battery unit, and the second sub-air duct is farther away from the battery module than the fourth sub-air duct.

3. The energy storage device according to claim 2, characterized in that, The housing also includes multiple connecting pipes, which are respectively connected to the first sub-air duct and the second sub-air duct. The multiple connecting pipes are spaced apart and form connecting gaps, which are respectively connected to the third sub-air duct and the fourth sub-air duct.

4. The energy storage device according to claim 2, characterized in that, The energy storage device further includes a plurality of first heat dissipation fins, which extend along the first direction and are disposed in the first sub-air duct. The plurality of first heat dissipation fins are connected to the first battery section and are used to dissipate heat from the first battery section. Alternatively, the energy storage device further includes a plurality of second heat dissipation fins, which are disposed within the fourth sub-air duct and extend along the first direction. The plurality of second heat dissipation fins are connected to the second battery section and are used to dissipate heat from the second battery section.

5. The energy storage device according to claim 4, characterized in that, The energy storage device further includes a plurality of third heat dissipation fins, which extend along the first direction. A plurality of first heat dissipation fins are disposed in the bottom air duct. The plurality of third heat dissipation fins are connected to the liquid cooling assembly and are used to dissipate heat from the airflow.

6. The energy storage device according to claim 1, characterized in that, The gas drive assembly includes a plurality of first fans and / or a plurality of second fans, the plurality of first fans being used to apply thrust to the airflow within the circulating air duct, and the plurality of second fans being used to apply suction to the airflow within the circulating air duct.

7. The energy storage device according to claim 4, characterized in that, The energy storage device further includes a heat spreader plate, which is disposed between the battery module and the plurality of first heat dissipation fins and the plurality of second heat dissipation fins, and the heat spreader plate is respectively connected to the battery module and the plurality of first heat dissipation fins and the plurality of second heat dissipation fins.

8. The energy storage device according to claim 4, characterized in that, The distance between the plurality of first heat dissipation fins, the plurality of second heat dissipation fins, and the battery module is α, wherein α satisfies: α≥8mm.

9. The energy storage device according to claim 5, characterized in that, The first heat dissipation fin includes at least one of straight fins, serrated fins, and louvered fins; Or, the second heat dissipation fin includes at least one of straight fins, serrated fins, and louvered fins; Or, the third heat dissipation fin includes at least one of straight fins, serrated fins, and louvered fins.

10. The energy storage device according to any one of claims 1-9, characterized in that, The liquid cooling assembly includes a liquid cooling plate, an inlet pipe, and an outlet pipe. The liquid cooling plate contains cooling liquid. The inlet pipe and the outlet pipe are respectively connected to the liquid cooling plate. The inlet pipe is used to input the cooling liquid, and the outlet pipe is used to output the cooling liquid.

11. An electrical system, characterized in that, include: Electrical equipment; as well as The energy storage device according to any one of claims 1 to 10, wherein the energy storage device is used to supply power to the electrical equipment.

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