Energy storage device, electric system and energy storage system

Abstract

The present application provides an energy storage device, an electric system and an energy storage system. The energy storage device comprises: a plurality of energy storage units, wherein the plurality of energy storage units are sequentially arranged in a first direction, and each energy storage unit comprises an explosion-proof valve; an isolation plate, wherein the isolation plate is located on the side of the plurality of energy storage units where the explosion-proof valves are arranged, and extends in the first direction, the isolation plate is provided with a plurality of air holes arranged at intervals in the first direction, each air hole is at least partially stacked with one explosion-proof valve, and different explosion-proof valves are stacked with different air holes; and a first heat-insulating piece and a second heat-insulating piece, wherein the first heat-insulating piece and the second heat-insulating piece are located on the same side of the isolation plate that faces away from the plurality of energy storage units, and the first heat-insulating piece and the second heat-insulating piece are arranged on two opposite sides of each explosion-proof valve and are spaced apart in a second direction, a drainage channel is enclosed by the first heat-insulating piece, the second heat-insulating piece and the isolation plate, and opposite ends of the drainage channel are both in communication with the external environment and are in communication with the space of the explosion-proof valves facing the isolation plate, the first direction intersecting with the second direction.

Description

Energy storage devices, power systems and energy storage systems Technical Field

[0001] The present application relates to the field of electronics, and in particular to an energy storage device, a power consumption system and an energy storage system. Background Art

[0002] An energy storage device usually has multiple energy storage units (e.g., multiple battery cells) installed inside. The multiple energy storage units are electrically connected via electrical connectors, and the parameters of the energy storage units (e.g., voltage parameters, temperature parameters, etc.) are collected via wiring harnesses. When thermal runaway occurs in some of the multiple energy storage units, explosion-proof valves explode, and a large amount of high-temperature, high-pressure combustible gas rushes out, the high-temperature gas quickly fills the entire internal space of the energy storage device. The high-temperature combustible gas can easily melt the insulation layer on the surface of the wiring harness, electrical connectors, etc., causing insulation failure or short circuit of the wiring harness or electrical connectors, which can easily lead to the spread of thermal runaway, the expansion of the thermal runaway range, and the generation of sparks that cause fire, thereby reducing the safety of the energy storage device.

[0003] Summary of the Invention

[0004] In response to the above problems, an embodiment of the present application provides an energy storage device, which can prevent the spread of thermal runaway when thermal runaway occurs, thereby improving the safety of the energy storage device.

[0005] A first embodiment of the present application provides an energy storage device, comprising:

[0006] A plurality of energy storage units, wherein the plurality of energy storage units are arranged sequentially along a first direction, and each of the energy storage units includes an explosion-proof valve;

[0007] an isolation plate, the isolation plate being located on a side of the plurality of energy storage units having the explosion-proof valves and extending along a first direction, the isolation plate having a plurality of air holes spaced apart along the first direction, each of the air holes being at least partially overlapped with an explosion-proof valve, and different explosion-proof valves being overlapped with different air holes; and

[0008] A first thermal insulation member and a second thermal insulation member, the first thermal insulation member and the second thermal insulation member are located on the same side of the isolation plate away from the multiple energy storage units, the first thermal insulation member and the second thermal insulation member are spaced apart along the second direction on opposite sides of the explosion-proof valve, the first thermal insulation member, the second thermal insulation member and the isolation plate form a drainage channel, the opposite ends of the drainage channel are connected to the external environment and connected to the space of the explosion-proof valve facing the isolation plate, wherein the first direction intersects with the second direction.

[0009] A second embodiment of the present application provides an electricity consumption system, comprising:

[0010] Electrical equipment; and

[0011] The energy storage device described in the embodiment of the present application supplies power to the electrical equipment.

[0012] A third aspect of the present application provides an energy storage system, comprising:

[0013] An electric energy conversion device, the electric energy conversion device is used to convert other forms of energy into electric energy;

[0014] The energy storage device according to the embodiment of the present application is electrically connected to the electric energy conversion device and is used to store the electric energy of the electric energy conversion device; and

[0015] An electrical load is electrically connected to the power conversion device and the energy storage device, respectively, and is used to operate using the electrical energy of the power conversion device or the energy storage device.

[0016] The energy storage device of the embodiment of the present application is provided with a first thermal insulation member and a second thermal insulation member on opposite sides of the explosion-proof valve of the energy storage unit. The first thermal insulation member, the second thermal insulation member and the isolation plate enclose a drainage channel. The opposite ends of the drainage channel are both connected to the external environment and to the space of the explosion-proof valve facing the isolation plate. By providing the drainage channel, when thermal runaway occurs in some energy storage units of the energy storage device and the explosion-proof valves of some energy storage units explode, a large amount of high-temperature, high-pressure combustible gas is instantly generated in the energy storage unit and rushes out from the explosion-proof valve position, the high-temperature gas can be drained or discharged along the drainage channel. Directing the high-temperature gas to the outside of the energy storage device can prevent the high-temperature gas from randomly dispersing inside the energy storage device and filling the entire space of the energy storage device, thereby melting the insulation layer on the surface of the wiring harness, electrical connectors (such as copper busbars) and the like that electrically connect the energy storage units in the energy storage device, thereby causing the insulation of the wiring harness or electrical connectors to fail or short-circuit, thereby exacerbating the spread of thermal runaway and even generating sparks, igniting the energy storage device and expanding the scope of thermal runaway. As a result, when thermal runaway occurs in some energy storage units of the energy storage device according to the embodiment of the present application, the spread and expansion of thermal runaway can be better avoided, thereby improving the safety of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] FIG1 is a diagram showing an application scenario of an energy storage system according to an embodiment of the present application.

[0019] FIG2 is a schematic structural diagram of an energy storage system according to an embodiment of the present application.

[0020] FIG3 is a circuit block diagram of an energy storage system according to an embodiment of the present application.

[0021] FIG4 is a schematic structural diagram of an electrical device according to an embodiment of the present application.

[0022] FIG5 is a schematic diagram of a partial explosion structure of an electrical device according to an embodiment of the present application.

[0023] FIG6 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.

[0024] FIG7 is a schematic diagram of a partial explosion structure of an energy storage device according to an embodiment of the present application.

[0025] FIG8 is a schematic structural diagram of a first thermal insulation member and a second thermal insulation member according to an embodiment of the present application.

[0026] FIG9 is a top view of the first thermal insulation member and the second thermal insulation member of the embodiment of FIG8 of the present application.

[0027] FIG10 is a schematic structural diagram of an isolation plate according to an embodiment of the present application.

[0028] FIG11 is an enlarged view of the dotted frame I in FIG10 .

[0029] FIG12 is a schematic structural diagram of an energy storage device according to another embodiment of the present application.

[0030] FIG13 is a schematic diagram of a partial explosion structure of the energy storage device of the embodiment of FIG12 of the present application.

[0031] FIG14 is a schematic structural diagram of the isolation plate of FIG10 from another perspective.

[0032] FIG. 15 is an enlarged view of the dotted-line frame II in FIG. 14 .

[0033] FIG. 16 is an enlarged view of the dotted-line frame III in FIG. 10 .

[0034] FIG17 is a schematic structural diagram of an energy storage device according to another embodiment of the present application, in which the cover plate is omitted.

[0035] FIG18 is an enlarged view of the dotted-line frame IV in FIG17 .

[0036] FIG19 is an enlarged view of the dotted frame V in FIG17 .

[0037] FIG20 is an enlarged view of the dotted-line frame VI in FIG17 .

[0038] FIG21 is an assembly diagram of the isolation plate, the first thermal insulation member and the second thermal insulation member of the present application.

[0039] FIG22 is an enlarged view of the dotted-line frame VII in FIG15 .

[0040] FIG. 23 is an enlarged view of the dotted-line frame VIII in FIG. 16 .

[0041] FIG24 is a circuit block diagram of an energy storage device according to an embodiment of the present application.

[0042] Explanation of the accompanying symbols: 300-energy storage system, 310-electric energy conversion device, 330-electric load, 200-electric system, 210-electric equipment, 100-energy storage device, 10-energy storage unit, 11-explosion-proof valve, 20-frame, 21-receiving groove, 23-first exhaust hole, 25-second exhaust hole, 30-isolation plate, 32-main body, 321-air vent, 33-first mounting part, 34-second mounting part, 341-first slot, 35-third mounting part, 351-second slot, 36-fourth mounting part, 37-first assembly groove, 38-second assembly groove, 31-first elastic part, 311-first supporting sub-part, 313-first protruding sub-part; 315-first Arc-shaped transition surface; 39-second elastic part, 391-second supporting sub-part, 393-second protruding sub-part, 395-second arc-shaped transition surface; 40-cover plate, 50-first thermal insulation part, 51-first thermal insulation part, 53-second thermal insulation part, 60-exhaust device, 70-second thermal insulation part, 71-third thermal insulation part, 73-fourth thermal insulation part, 101-drainage channel, 1011-first drainage port, 1013-second drainage port, 80-wiring harness, 90-electrical connector, 102-battery management unit, 103-temperature sensor. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0045] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0046] It should be noted that, for the convenience of explanation, in the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0047] 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.

[0048] Taking electrochemical energy storage as an example, this solution provides an energy storage device 100. The energy storage device 100 is equipped with a chemical battery. The chemical elements in the battery are mainly used as the energy storage medium. 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 a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0049] Current energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices 100 include:

[0050] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0051] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of the household energy storage device 100 is equivalent to the user providing a backup power supply for himself and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0052] Figure 1 is an application scenario diagram of the energy storage system 300 provided in an embodiment of the present application. The embodiment of Figure 1 of the present application is explained by taking the household energy storage scenario in the user-side energy storage as an example. The energy storage device 100 of the present application is not limited to the household energy storage scenario. Figure 2 is a structural schematic diagram of the energy storage system 300 of an embodiment of the present application. Figure 3 is a circuit block diagram of the energy storage system 300 of an embodiment of the present application. Please refer to Figures 1 to 3. The present application provides an energy storage system 300, which is a household energy storage system 300. The energy storage system 300 includes an electric energy conversion device 310, an energy storage device 100, and an electrical load 330. The electric energy conversion device 310 is used to convert other forms of energy into electric energy; the energy storage device 100 is electrically connected to the electric energy conversion device 310 and is used to store the electric energy of the electric energy conversion device 310; the electric load 330 is electrically connected to the electric energy conversion device 310 and the energy storage device 100 respectively, and is used to operate using the electric energy of the electric energy conversion device 310 or the energy storage device 100. It can be understood that part of the electric energy converted by the electric energy conversion device 310 is stored in the energy storage device 100, and part is used to power the electric load 330. The energy storage device 100 is used to store electric energy and supply the electric load 330 during peak electricity prices. The energy storage system 300 can both convert other forms of energy into electric energy and store electric energy in the energy storage device 100 to provide sufficient electric energy for the electric load 330.

[0053] Optionally, the electric energy conversion device 310 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy, providing a stable power supply for the electrical load 330 and the energy storage device 100 .

[0054] Optionally, the power conversion device 310 may be a photovoltaic panel, which can convert solar energy into electrical energy during periods of low electricity prices and store the energy in the energy storage device 100. In other embodiments, the power conversion device 310 may be at least one of a wind power generation device, a thermal power generation device, a tidal power generation device, a biomass power generation device, and a mechanical power generation device.

[0055] Optionally, the energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall. In other embodiments, the energy storage device 100 can also be a large energy storage container, a battery used in electronic equipment, etc.

[0056] Optionally, the electrical load 330 may be a street lamp, household appliance, motor vehicle, etc. The energy storage device 100 is used to store the electrical energy and supply it to street lamps and household appliances for use when electricity prices are high, or to supply power when the grid is out of power.

[0057] It is understood that the energy storage device 100 may include but is not limited to at least one of a single cell, a battery module, a battery pack, a battery system, etc. The single cell may be but is not limited to at least one of a cylindrical battery, a square battery, etc.

[0058] It is understandable that the drawings in this embodiment illustrate only one form of the energy storage system 300 and should not be understood as limiting the energy storage system 300 provided in this application, nor should they be understood as limiting the energy storage device 100 provided in each embodiment of this application.

[0059] Please refer to Figures 4 and 5. Figure 4 is a schematic diagram of the structure of an electrical device 210 according to one embodiment of the present application. Figure 5 is a schematic diagram of a partially exploded structure of an electrical device 210 according to one embodiment of the present application. This embodiment of the present application also provides an electrical system 200, which includes: an electrical device 210 and an energy storage device 100, wherein the energy storage device 100 provides power to the electrical device 210.

[0060] The power-consuming device 210 in the embodiments of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, tablet computer, laptop computer, desktop computer, smart bracelet, smart watch, e-reader, game console, or the like. It may also be a vehicle such as a car, truck, sedan, van, lorry, train, high-speed train, electric vehicle, or other vehicle. Furthermore, it may be various household appliances such as refrigerators, electric lights, and air conditioners. It should be understood that the power-consuming device 210 illustrated in the drawings of this application is merely one embodiment of the power-consuming device 210 and should not be construed as limiting the power-consuming device 210 provided herein.

[0061] An energy storage device usually has multiple energy storage units (e.g., multiple battery cells) installed inside. The multiple energy storage units are electrically connected to each other through electrical connectors such as aluminum bars, and the energy storage units are electrically connected to a battery management unit through wiring harnesses to collect parameters of the energy storage units (e.g., voltage parameters, temperature parameters, etc.). When thermal runaway occurs in some of the multiple energy storage units, the explosion-proof valves explode, and a large amount of high-temperature, high-pressure combustible gas rushes out. The high-temperature gas quickly and irregularly spreads and fills the entire internal space of the energy storage device. The high-temperature combustible gas can easily melt the insulation layer on the surface of the wiring harness, electrical connectors, etc., resulting in insulation failure or short circuit of the wiring harness or electrical connectors, which can easily lead to the spread of thermal runaway, the expansion of the thermal runaway range, and the generation of sparks that cause fire, thereby reducing the safety of the energy storage device.

[0062] Please refer to Figures 6 and 7. Figure 6 is a schematic structural diagram of an energy storage device 100 according to an embodiment of the present application. Figure 7 is a schematic structural diagram of a partial explosion of an energy storage device 100 according to an embodiment of the present application. The present application also provides an energy storage device 100, which includes a plurality of energy storage units 10, an isolation plate 30, a first thermal insulation member 50, and a second thermal insulation member 70. The plurality of energy storage units 10 are arranged in sequence along a first direction (as shown by the double arrow A in Figure 6), and each of the energy storage units 10 includes an explosion-proof valve 11; the isolation plate 30 is located on a side of the plurality of energy storage units 10 having the explosion-proof valve 11 and extends along the first direction, the isolation plate 30 has a plurality of air holes 321 arranged at intervals along the first direction, each of the air holes 321 is at least partially stacked with an explosion-proof valve 11, and different explosion-proof valves 11 are stacked with different air holes 321; the first thermal insulation member 50 and the second thermal insulation member 70 Located on the same side of the isolation plate 30 away from the multiple energy storage units 10, the first thermal insulation member 50 and the second thermal insulation member 70 are spaced apart on opposite sides of the explosion-proof valve 11 along the second direction (as shown by the double arrow B in Figure 6), and the first thermal insulation member 50, the second thermal insulation member 70 and the isolation plate 30 enclose a drainage channel 101, and the opposite ends of the drainage channel 101 are connected to the external environment and connected to the space of the explosion-proof valve 11 facing the isolation plate 30, wherein the first direction intersects with the second direction.

[0063] Optionally, the energy storage unit 10 can be applied to, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, energy storage batteries, and other energy storage units 10. It is understood that the energy storage unit 10 illustrated in the drawings of this application is merely one form of the energy storage unit 10 and should not be construed as limiting the energy storage unit 10 provided herein.

[0064] Optionally, the explosion-proof valves 11 of the multiple energy storage units 10 face the same side. In other words, the explosion-proof valves 11 of the multiple energy storage units 10 face the same direction. In other words, the explosion-proof valves 11 of the multiple energy storage units 10 are located on the same side of the multiple energy storage units 10.

[0065] It should be noted that each of the air holes 321 is at least partially overlapped with an explosion-proof valve 11, and different explosion-proof valves 11 are overlapped with different air holes 321. It can be understood that the orthographic projection of each explosion-proof valve 11 on the surface of the isolation plate 30 facing the energy storage unit 10 is at least partially overlapped with the orthographic projection of an air hole 321 on the surface of the isolation plate 30 facing the energy storage unit 10, and the orthographic projections of different explosion-proof valves 11 on the surface of the isolation plate 30 facing the energy storage unit 10 are at least partially overlapped with the orthographic projections of different air holes 321 on the surface of the isolation plate 30 facing the energy storage unit 10. In a specific embodiment, the orthographic projection of each explosion-proof valve 11 on the surface of the isolation plate 30 facing the energy storage unit 10 coincides with the orthographic projection of an air hole 321 on the surface of the isolation plate 30 facing the energy storage unit 10.

[0066] Each of the air holes 321 is at least partially stacked with an explosion-proof valve 11, and different explosion-proof valves 11 are stacked with different air holes 321. It can also be understood that each of the air holes 321 is connected to a space where an explosion-proof valve 11 faces the isolation plate 30, and different explosion-proof valves 11 face the isolation plate 30 and are connected to different air holes 321. The air holes 321 correspond one to one with the explosion-proof valves 11.

[0067] It should be noted that both the first thermal insulation member 50 and the second thermal insulation member 70 extend along the first direction.

[0068] It should be noted that the space where the explosion-proof valve 11 faces the isolation plate 30 (ie, the space between the explosion-proof valve 11 and the isolation plate 30 ) can be connected to the external environment through the drainage channel 101 .

[0069] “External environment” refers to the environment outside the energy storage device.

[0070] Optionally, the first direction is perpendicular to the second direction.

[0071] The energy storage device 100 of the embodiment of the present application is provided with a first heat insulating member 50 and a second heat insulating member 70 on opposite sides of the explosion-proof valve 11 of the energy storage unit 10, wherein the first heat insulating member 50, the second heat insulating member 70 and the isolation plate 30 enclose a drainage channel 101, and the opposite ends of the drainage channel 101 are both connected to the external environment and to the space of the explosion-proof valve 11 facing the isolation plate 30. By providing the drainage channel 101, when thermal runaway occurs in some energy storage units 10 of the energy storage device 100 and the explosion-proof valves 11 of some energy storage units 10 explode, a large amount of high-temperature, high-pressure combustible gas is instantly generated in the energy storage unit 10 and rushes out from the explosion-proof valve 11. The gas can flow along the drainage channel 101. By diverting or directing the high-temperature gas to the outside of the energy storage device 100, the high-temperature gas can be prevented from randomly dispersing inside the energy storage device 100 and filling the entire space of the energy storage device 100, thereby melting the insulation layer on the surface of the wiring harness and electrical connectors (such as copper busbars) that electrically connect the energy storage units 10 in the energy storage device 100, thereby causing insulation failure or short circuit in the wiring harness or electrical connectors, thereby exacerbating the spread of thermal runaway and even generating sparks that ignite the energy storage device 100 and expand the scope of thermal runaway. As a result, when thermal runaway occurs in some of the energy storage units 10 of the energy storage device 100 of the embodiment of the present application, the spread and expansion of thermal runaway can be effectively avoided, thereby improving the safety of the energy storage device 100.

[0072] Please refer to FIG. 8 , which is a schematic structural diagram of the first thermal insulation member 50 and the second thermal insulation member 70 according to an embodiment of the present application. In some embodiments, the first thermal insulation component 50 includes a first thermal insulation part 51 and a second thermal insulation part 53 connected to each other, and the first thermal insulation part 51 and the second thermal insulation part 53 are arranged along the first direction; the second thermal insulation component 70 includes a third thermal insulation part 71 and a fourth thermal insulation part 73 connected to each other, and the third thermal insulation part 71 and the fourth thermal insulation part 73 are arranged along the first direction; the first thermal insulation part 51 and the third thermal insulation part 71 are arranged opposite to each other, and the distance between the first thermal insulation part 51 and the third thermal insulation part 71 gradually increases from one end close to the second thermal insulation part 53 and the fourth thermal insulation part 73 toward the end away from the second thermal insulation part 53 and the fourth thermal insulation part 73; the second thermal insulation part 53 and the fourth thermal insulation part 73 are arranged opposite to each other, and the distance between the second thermal insulation part 53 and the fourth thermal insulation part 73 gradually increases from one end close to the first thermal insulation part 51 and the third thermal insulation part 71 toward the end away from the first thermal insulation part 51 and the third thermal insulation part 71.

[0073] It can be understood that the first thermal insulation portion 51 and the third thermal insulation portion 71 are arranged along the second direction, the first thermal insulation portion 51 and the third thermal insulation portion 71 are an integral structure, and the first thermal insulation portion 51 and the third thermal insulation portion 71 are two different parts of the first thermal insulation member 50. The second thermal insulation portion 53 and the fourth thermal insulation portion 73 are also arranged along the second direction, the second thermal insulation portion 53 and the fourth thermal insulation portion 73 are an integral structure, and the second thermal insulation portion 53 and the fourth thermal insulation portion 73 are two different parts of the second thermal insulation member 70.

[0074] It is understood that the distance between the first thermal insulation member 50 and the second thermal insulation member 70 gradually increases from the middle position toward the positions near the two ends. In other words, the distance between the first thermal insulation member 50 and the second thermal insulation member 70 near the middle position is smaller than the distance near the two ends.

[0075] It is also understandable that the width of the drainage channel 101 gradually increases from the connection between the first insulation portion 51 and the second insulation portion 53 (or the third insulation portion 71 and the fourth insulation portion 73) toward the opposite ends of the drainage channel 101. In other words, the width of the drainage channel 101 gradually increases from the middle position toward the ends.

[0076] It can be understood that the first insulation portion 51 and the third insulation portion 71 are arranged in a bell-mouth shape, and the second insulation portion 53 and the fourth insulation portion 73 are arranged in a bell-mouth shape. In other words, the first insulation member 50 and the second insulation member 70 are arranged in a bidirectional bell-mouth shape. In other words, the first insulation member 50 and the second insulation member 70 form a split bell-mouth structure.

[0077] In this embodiment, by providing a bell-mouth shape between the first insulation portion 51 and the third insulation portion 71, and between the second insulation portion 53 and the fourth insulation portion 73, thereby forming a bidirectional bell-mouth shape, when some of the energy storage units 10 in the energy storage device 100 experience thermal runaway, the explosion-proof valve 11 explodes, and a large amount of high-temperature, high-pressure combustible gas rushes out, the high-temperature combustible gas can be better discharged to the outside of the energy storage device 100 (i.e., the external environment) more quickly along the drainage channel 101 to both sides, thereby increasing the speed at which the high-temperature combustible gas is discharged from the energy storage device 100, making the exhaust of the high-temperature combustible gas smoother, better preventing the spread of thermal runaway of the energy storage device 100, and improving the safety of the energy storage device 100.

[0078] Please refer to Figure 9, which is a top view of the first thermal insulation member 50 and the second thermal insulation member 70 of the embodiment of Figure 8 of the present application. Optionally, the angle α between the first thermal insulation member 51 and the third thermal insulation member 71 is in the range of 5°≤α≤30°. In other words, the angle α between the surface of the first thermal insulation member 51 facing the third thermal insulation member 71 and the surface of the third thermal insulation member 71 facing the first thermal insulation member 51 can be, but is not limited to, 5°, 8°, 10°, 13°, 15°, 18°, 20°, 23°, 25°, 28°, 30°, etc. If the angle α between the first thermal insulation member 51 and the third thermal insulation member 71 is too small, the increase in the exhaust velocity of the high-temperature combustible gas in the event of thermal runaway is limited. If the angle α between the first thermal insulation member 51 and the third thermal insulation member 71 is too large, it is not conducive to the arrangement of other components within the energy storage device 100. When the angle α between the first insulation portion 51 and the third insulation portion 71 is 5°≤α≤30°, the discharge rate of the high-temperature combustible gas can be increased when thermal runaway occurs, and the arrangement of the components of the energy storage device 100 can be made more compact, thereby improving the energy density of the energy storage device 100.

[0079] In a specific embodiment, the surface of the first thermal insulation part 51 facing the third thermal insulation part 71 is a plane, the surface of the third thermal insulation part 71 facing the first thermal insulation part 51 is a plane, and the angle between the surface of the first thermal insulation part 51 facing the third thermal insulation part 71 and the surface of the third thermal insulation part 71 facing the first thermal insulation part 51 is between 5° and 30°.

[0080] In another specific embodiment, the surface of the first thermal insulation part 51 facing the third thermal insulation part 71 is a curved surface, the surface of the third thermal insulation part 71 facing the first thermal insulation part 51 is a curved surface, and the angle between the surface of the first thermal insulation part 51 facing the third thermal insulation part 71 and the surface of the third thermal insulation part 71 facing the first thermal insulation part 51 is in any range between 5° and 30°, which means that the angle gradually increases from the position close to the second thermal insulation part 53 and the fourth thermal insulation part 73 to the position away from the second thermal insulation part 53, for example, gradually increases from 8° to 20°.

[0081] Optionally, the range of the angle β between the second thermal insulation portion 53 and the fourth thermal insulation portion 73 is: 5°≤β≤30°. In other words, the range of the angle β between the surface of the second thermal insulation portion 53 facing the fourth thermal insulation portion 73 and the surface of the fourth thermal insulation portion 73 facing the second thermal insulation portion 53 is: 5°≤β≤30°. Specifically, the angle β between the second thermal insulation portion 53 and the fourth thermal insulation portion 73 can be, but is not limited to, 5°, 8°, 10°, 13°, 15°, 18°, 20°, 23°, 25°, 28°, 30°, etc. If the angle β between the second thermal insulation portion 53 and the fourth thermal insulation portion 73 is too small, the increase in the exhaust velocity of the high-temperature combustible gas in the event of thermal runaway is limited. If the angle β between the second thermal insulation portion 53 and the fourth thermal insulation portion 73 is too large, it is not conducive to the arrangement of other components in the energy storage device 100. When the angle β between the second thermal insulation portion 53 and the fourth thermal insulation portion 73 is 5°≤β≤30°, the discharge rate of the high-temperature combustible gas can be increased when thermal runaway occurs, and the arrangement of the components of the energy storage device 100 can be made more compact, thereby improving the energy density of the energy storage device 100.

[0082] In a specific embodiment, the surface of the second thermal insulation part 53 facing the fourth thermal insulation part 73 is a plane, the surface of the fourth thermal insulation part 73 facing the second thermal insulation part 53 is a plane, and the angle between the surface of the second thermal insulation part 53 facing the fourth thermal insulation part 73 and the surface of the fourth thermal insulation part 73 facing the second thermal insulation part 53 is between 5° and 30°.

[0083] In another specific embodiment, the surface of the second thermal insulation part 53 facing the fourth thermal insulation part 73 is a curved surface, the surface of the fourth thermal insulation part 73 facing the second thermal insulation part 53 is a curved surface, and the angle between the surface of the second thermal insulation part 53 facing the fourth thermal insulation part 73 and the surface of the fourth thermal insulation part 73 facing the second thermal insulation part 53 is in any range between 5° and 30°, and gradually increases from a position close to the first thermal insulation part 51 and the third thermal insulation part 71 to a position away from the second thermal insulation part 53, for example, gradually increasing from 8° to 20°.

[0084] Optionally, the minimum distance between the first thermal insulation member 50 and the second thermal insulation member 70 is greater than the minimum length of the explosion-proof valve 11 along the second direction. This can better prevent thermal runaway of the energy storage device 100. When the explosion-proof valve 11 explodes, the high-temperature, high-pressure combustible gas discharged from the explosion-proof valve 11 can completely enter the drainage channel 101 and will not escape to locations outside the drainage channel 101.

[0085] Optionally, the minimum distance d between the first thermal insulation member 50 and the second thermal insulation member 70 is in the range of 8mm≤d≤25mm. Specifically, the minimum distance d between the first thermal insulation member 50 and the second thermal insulation member 70 can be, but not limited to, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, etc. If the minimum distance between the first thermal insulation member 50 and the second thermal insulation member 70 is too small, it may affect the opening of the explosion-proof valve 11. If the minimum distance between the first thermal insulation member 50 and the second thermal insulation member 70 is too large, it is not conducive to the close arrangement of the internal components of the energy storage device 100, nor is it conducive to improving the energy density of the energy storage device 100.

[0086] Optionally, the first thermal insulation member 50 may be, but is not limited to, at least one of a mica board, a ceramic silicone rubber thermal insulation board, an aerogel thermal insulation board, and the like.

[0087] Optionally, the second thermal insulation member 70 may be, but is not limited to, at least one of a mica board, a ceramic silicone rubber thermal insulation board, an aerogel thermal insulation board, and the like.

[0088] 10 and 11 , FIG10 is a schematic structural diagram of an isolation plate 30 according to an embodiment of the present application. FIG11 is an enlarged view of the dotted box I in FIG10 . In some embodiments, the isolation plate 30 includes a main body 32, a first mounting portion 33, a second mounting portion 34, a third mounting portion 35 and a fourth mounting portion 36. The main body 32 has a plurality of air holes 321 spaced apart along a first direction. The first mounting portion 33, the second mounting portion 34, the third mounting portion 35 and the fourth mounting portion 36 are sequentially spaced apart along the second direction on a surface of the main body 32 facing away from the plurality of energy storage units 10. The first mounting portion 33 and the second mounting portion 34 are arranged on the same side of the air holes 321. The main body 32, the first mounting portion 33 and the second mounting portion 34 form a first assembly groove 37, which is used to set the first thermal insulation member 50; the third mounting portion 35 and the fourth mounting portion 36 are both arranged on the side of the air hole 321 away from the first mounting portion 33 and the second mounting portion 34. The main body 32, the third mounting portion 35 and the third mounting portion form a second assembly groove 38, which is used to set the second thermal insulation member 70.

[0089] It can be understood that the first mounting portion 33, the second mounting portion 34, the third mounting portion 35 and the fourth mounting portion 36 all extend along the first direction, the second mounting portion 34 and the third mounting portion 35 are arranged on opposite sides of the air vent 321, the first mounting portion 33 is arranged on the side of the second mounting portion 34 away from the third mounting portion 35, and the fourth mounting portion 36 is arranged on the side of the third mounting portion 35 away from the second mounting portion 34.

[0090] It can be understood that the main body 32, the first mounting part 33, the second mounting part 34, the third mounting part 35 and the fourth mounting part 36 are an integrated structure, and the main body 32, the first mounting part 33, the second mounting part 34, the third mounting part 35 and the fourth mounting part 36 are all different parts of the isolation plate 30.

[0091] In this embodiment, the cooperation between the main body 32, the first mounting portion 33, and the second mounting portion 34 allows the first thermal insulator 50 to be more securely mounted on the isolation plate 30. The cooperation between the main body 32, the third mounting portion 35, and the fourth mounting portion 36 allows the second thermal insulator 70 to be more securely mounted on the isolation plate 30. Furthermore, this allows for a gap-free fit between the first and second thermal insulators 50, 70, and the isolation plate 30. This effectively prevents high-temperature combustible gases from being discharged to the side of the first or second thermal insulator 50, 70 facing away from the drainage channel 101 in the event of thermal runaway of the energy storage device 100.

[0092] Please refer to Figures 12 to 16. Figure 12 is a structural schematic diagram of an energy storage device 100 according to another embodiment of the present application. Figure 13 is a schematic diagram of the partially exploded structure of the energy storage device 100 according to the embodiment of Figure 12 of the present application. Figure 14 is a structural schematic diagram of the isolation plate 30 of Figure 10 from another perspective. Figure 15 is an enlarged view of the dotted box II in Figure 14. Figure 16 is an enlarged view of the dotted box III in Figure 10. In some embodiments, the energy storage device 100 further includes a frame 20 and a cover plate 40. The frame 20 has a receiving groove 21. The receiving groove 21 is used to receive the multiple energy storage units 10, the isolation plate 30, the first thermal insulation member 50, and the second thermal insulation member 70. The cover plate 40 closes the receiving groove 21 and is fixed to the frame 20. The isolation plate 30 also includes a first elastic portion 31 and a second elastic portion 39, and the first elastic portion 31 and the second elastic portion 39 are both arranged on the surface of the main body 32 facing away from the multiple energy storage units 10; the first elastic portion 31 is at least partially located in the first assembly groove 37, and is used to support the first thermal insulation member 50, so that the end surface of the first thermal insulation member 50 facing away from the first elastic portion 31 is tightly fitted into the surface of the cover plate 40 facing the receiving groove 21; the second elastic portion 39 is at least partially located in the second assembly groove 38, and is used to support the second thermal insulation member 70, so that the end surface of the second thermal insulation member 70 facing away from the second elastic portion 39 is tightly fitted into the surface of the cover plate 40 facing the receiving groove 21.

[0093] It can be understood that the main body 32, the first mounting part 33, the second mounting part 34, the third mounting part 35, the fourth mounting part 36, the first elastic part 31 and the second elastic part 39 are an integrated structure, and the main body 32, the first mounting part 33, the second mounting part 34, the third mounting part 35, the fourth mounting part 36, the first elastic part 31 and the second elastic part 39 are all different parts of the isolation plate 30.

[0094] It can be understood that the receiving groove 21 has an opening (not shown in the figure), the cover plate 40 is arranged at the opening, and is fixed to the frame 20, thereby restricting the components of the energy storage device 100 such as multiple energy storage units 10, isolation plates 30, first thermal insulation members 50 and second thermal insulation members 70 within the receiving groove 21.

[0095] In this embodiment, one end of the first thermal insulation member 50 abuts against the first elastic portion 31, and the other end abuts against the surface of the cover plate 40 facing the receiving groove 21. When the first thermal insulation member 50 and the cover plate 40 are assembled, the first thermal insulation member 50 squeezes the first elastic portion 31 to deform, thereby making the isolation plate 30, the first thermal insulation member 50 and the cover plate 40 have an interference fit. This can better prevent the high-temperature, high-pressure combustible gas discharged from the energy storage device 100 from flowing to the side of the first thermal insulation member 50 away from the drainage channel 101 when thermal runaway occurs in the energy storage device 100, and damaging the insulation layer on the surface of the wiring harness or electrical connector on the side of the first thermal insulation member 50 away from the drainage channel 101. Similarly, one end of the second thermal insulation member 70 abuts the second elastic portion 39, and the other end abuts the surface of the cover plate 40 facing the receiving groove 21. When the second thermal insulation member 70 and the cover plate 40 are assembled, the second thermal insulation member 70 squeezes the second elastic portion 39 to cause deformation (after the second thermal insulation member 70 is assembled, the matching relationship between the second elastic portion 39 and the second thermal insulation member 70 is shown in Figures 17 and 18. Figure 17 is a structural schematic diagram of the energy storage device 100 of another embodiment of the present application, in which the cover plate 40 is omitted; Figure 18 is an enlarged view of the dotted box IV in Figure 17.), thereby making the isolation plate 30, the second thermal insulation member 70 and the cover plate 40 have an interference fit, so that when thermal runaway occurs, the high-temperature, high-pressure combustible gas discharged from the energy storage device 100 can be better prevented from flowing to the side of the second thermal insulation member 70 away from the drainage channel 101, and damaging the insulation layer on the surface of the wiring harness or electrical connector on the side of the second thermal insulation member 70 away from the drainage channel 101. This can better prevent the spread of thermal runaway when the energy storage device 100 experiences thermal runaway, prevent the energy storage device 100 from generating sparks and being ignited, and improve the safety of the energy storage device 100.

[0096] As shown in FIG15 , optionally, the second mounting portion 34 further has a first slot 341, and the first elastic portion 31 is also partially located in the first slot 341. This can further improve the mechanical strength of the first elastic portion 31.

[0097] As shown in Figure 16, optionally, the third mounting portion 35 further has a second slot 351, and the second elastic portion 39 is also partially located in the second slot 351. This can further improve the mechanical strength of the second elastic portion 39.

[0098] Please refer to Figures 19 to 21. Figure 19 is an enlarged view of the dotted box V in Figure 17. Figure 20 is an enlarged view of the dotted box VI in Figure 17. Figure 21 is an assembly diagram of the isolation plate 30, the first thermal insulation member 50, and the second thermal insulation member 70 of the present application.

[0099] Optionally, the drainage channel 101 has a first drainage port 1011 and a second drainage port 1013 at opposite ends thereof, and the frame 20 has a first exhaust hole 23 and a second exhaust hole 25 arranged opposite to each other along a first direction, with the first exhaust hole 23 communicating with the first drainage port 1011, and the second exhaust hole 25 communicating with the second drainage port 1013. In this way, when thermal runaway occurs in the energy storage device 100, high-temperature combustible gas is drained through the drainage channel 101 to the first drainage port 1011 and the second drainage port 1013, and finally discharged from the energy storage device 100 through the first exhaust hole 23 and the second exhaust hole 25.

[0100] In some embodiments, the energy storage device 100 further includes an exhaust device 60, which is disposed at the first exhaust hole 23 and is used to discharge the gas in the drainage channel 101 to the outside of the energy storage device 100, so that when thermal runaway occurs in the energy storage device 100, the high-temperature combustible gas in the drainage channel 101 can be quickly discharged from the energy storage device 100.

[0101] Optionally, the exhaust device 60 may be, but is not limited to, a fan, a blower, etc.

[0102] Please refer to Figure 22, which is an enlarged view of the dotted box VII in Figure 15. In some embodiments, the first elastic portion 31 includes a first supporting sub-portion 311 and a first protruding sub-portion 313. The first supporting sub-portion 311 is connected to the surface of the main body portion 32 facing the first thermal insulation member 50. The first protruding sub-portion 313 is protruded from the surface of the first supporting sub-portion 311 facing away from the main body portion 32, and is used to abut the first thermal insulation member 50. Along the arrangement direction of the first supporting sub-portion 311 and the first protruding sub-portion 313, the height h1 of the first protruding sub-portion 313 ranges from 0.5 mm to h1 and from 1.5 mm to 2.5 mm. Specifically, the height h1 of the first protruding sub-portion 313 can be, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc. If the height of the first protruding sub-portion 313 is too small, it will be difficult to achieve an interference fit with the first thermal insulation member 50 and the cover plate 40, which may easily cause a gap to exist between the first thermal insulation member 50 and the cover plate 40. As a result, when thermal runaway occurs in the energy storage device 100, high-temperature combustible gas will be discharged from the gap to the side of the first thermal insulation member 50 away from the drainage channel 101, increasing the risk of thermal runaway spreading and reducing the safety of the energy storage device 100. If the height of the first protruding sub-portion 313 is too large, it will increase the difficulty of assembling the cover plate 40.

[0103] Optionally, the first supporting sub-portion 311 and the first protruding sub-portion 313 are arranged along a third direction (not shown), wherein the first direction, the second direction, and the third direction intersect with each other. In one embodiment, the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is the stacking direction or arrangement direction of the energy storage unit 10, the isolation plate 30, and the first thermal insulation member 50 (or the second thermal insulation member 70).

[0104] Optionally, along the first direction, both opposite ends of the first supporting sub-portion 311 protrude from the first protruding sub-portion 313 .

[0105] Please refer to Figure 23, which is an enlarged view of the dashed box VIII in Figure 16. In some embodiments, the second elastic portion 39 includes a second supporting sub-portion 391 and a second protruding sub-portion 393. The second supporting sub-portion 391 is connected to the surface of the main body 32 facing the second thermal insulation member 70. The second protruding sub-portion 393 is provided on the surface of the second supporting sub-portion 391 facing away from the main body 32, and is used to abut the second thermal insulation member 70. Along the arrangement direction of the second supporting sub-portion 391 and the second protruding sub-portion 393, the height h2 of the second protruding sub-portion 393 ranges from 0.5 mm to h2 and from 1.5 mm to 2. Specifically, the height h2 of the second protruding sub-portion 393 can be, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc. If the height of the second protruding sub-portion 393 is too small, it will be difficult to achieve an interference fit with the second thermal insulation member 70 and the cover plate 40, which will easily lead to a gap between the second thermal insulation member 70 and the cover plate 40. As a result, when thermal runaway occurs in the energy storage device 100, high-temperature combustible gas will be discharged from the gap to the side of the second thermal insulation member 70 away from the drainage channel 101, thereby increasing the risk of thermal runaway spreading and reducing the safety of the energy storage device 100. If the height of the second protruding sub-portion 393 is too large, it will increase the difficulty of assembling the cover plate 40.

[0106] Optionally, the second supporting sub-portion 391 and the second protruding sub-portion 393 are arranged along a third direction, wherein the first direction, the second direction, and the third direction intersect with each other. In one embodiment, the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is the stacking direction or arrangement direction of the energy storage unit 10, the isolation plate 30, and the second thermal insulation member 70 (or the first thermal insulation member 50).

[0107] Optionally, along the first direction, both opposite ends of the second supporting sub-portion 391 protrude from the second protruding sub-portion 393 .

[0108] Referring again to Figure 22 , the connection between the first supporting sub-portion 311 and the first protruding sub-portion 313 optionally comprises a first curved transition surface 315. The curvature radius R1 of the first curved transition surface 315 is in the range of 0.5 mm ≤ R1 ≤ 1.5 mm. Specifically, the curvature radius R1 of the first curved transition surface 315 may be, but is not limited to, 0.5 mm, 0.7 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.3 mm, 1.5 mm, etc. This allows for a smooth, curved transition between the first supporting sub-portion 311 and the first protruding sub-portion 313, thereby increasing the mechanical strength of the first elastic portion 31 and preventing localized mechanical weakness of the first elastic portion 31 during assembly of the first thermal insulation member 50 and the cover plate 40, leading to breakage and failure to form an interference fit.

[0109] Optionally, the first arc-shaped transition surface 315 may be, but is not limited to, a circular arc transition surface.

[0110] In a specific embodiment, there are two first arcuate transition surfaces 315, and the two first arcuate transition surfaces 315 are spaced apart along the first direction. The two first arcuate transition surfaces 315 are both concave in opposite directions, that is, each first arcuate transition surface 315 is concave in the direction of the other arcuate transition surface.

[0111] Referring again to Figure 23 , the connection between the second supporting sub-portion 391 and the second protruding sub-portion 393 optionally comprises a second curved transition surface 395. The curvature radius R2 of the second curved transition surface 395 ranges from 0.5 mm to R2 and from 1.5 mm to 1.5 mm. Specifically, the curvature radius R2 of the second curved transition surface 395 may be, but is not limited to, 0.5 mm, 0.7 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.3 mm, or 1.5 mm. This allows for a smooth, curved transition between the second supporting sub-portion 391 and the second protruding sub-portion 393, thereby increasing the mechanical strength of the second elastic portion 39 and preventing localized mechanical weakness in the second elastic portion 39 during assembly of the second thermal insulation member 70 and the cover plate 40, leading to breakage and failure to form an interference fit.

[0112] Optionally, the second arc-shaped transition surface 395 may be, but is not limited to, a circular arc transition surface.

[0113] In a specific embodiment, the number of the second arcuate transition surfaces 395 is two, and the two second arcuate transition surfaces 395 are spaced apart along the second direction. The two second arcuate transition surfaces 395 are both recessed in opposite directions, that is, each second arcuate transition surface 395 is recessed in the direction of the other arcuate transition surface.

[0114] Optionally, the elastic modulus E1 of the first elastic portion 31 is in the range of 2.0 GPa ≤ E1 ≤ 2.5 GPa. Specifically, the elastic modulus of the first elastic portion 31 may be, but is not limited to, 2.0 GPa, 2.1 GPa, 2.2 GPa, 2.3 GPa, 2.4 GPa, 2.5 GPa, etc. If the elastic modulus of the first elastic portion 31 is too large, the first elastic portion 31 may easily break, and it may be difficult to squeeze the first elastic portion 31 during installation of the first thermal insulation member 50 and the cover plate 40, thereby compressing and assembling the first thermal insulation member 50 and the cover plate 40. If the elastic modulus of the first elastic portion 31 is too small, the elastic force of the first elastic portion 31 is insufficient, making it difficult to form an interference fit with the first thermal insulation member 50 and the cover plate 40, so that a space (i.e., a gap) is easily left between the first thermal insulation member 50 and the cover plate 40. When thermal runaway occurs in the energy storage device 100, high-temperature combustible gas is discharged from the gap to the side of the first thermal insulation member 50 away from the drainage channel 101, thereby increasing the risk of thermal runaway spreading and reducing the safety of the energy storage device 100.

[0115] Optionally, the elastic modulus E2 of the second elastic portion 39 is in the range of 2.0 GPa ≤ E2 ≤ 2.5 GPa. Specifically, the elastic modulus of the second elastic portion 39 may be, but is not limited to, 2.0 GPa, 2.1 GPa, 2.2 GPa, 2.3 GPa, 2.4 GPa, 2.5 GPa, etc. If the elastic modulus of the second elastic portion 39 is too large, the second elastic portion 39 may easily break, and it may be difficult to squeeze the second elastic portion 39 during installation of the second thermal insulation member 70 and the cover plate 40, thereby compressing and assembling the second thermal insulation member 70 and the cover plate 40. If the elastic modulus of the second elastic portion 39 is too small, the elastic force of the second elastic portion 39 is insufficient, making it difficult to form an interference fit with the second thermal insulation member 70 and the cover plate 40, so that a space (i.e., a gap) is easily left between the second thermal insulation member 70 and the cover plate 40. When thermal runaway occurs in the energy storage device 100, high-temperature combustible gas is discharged from the gap to the side of the second thermal insulation member 70 away from the drainage channel 101, thereby increasing the risk of thermal runaway spreading and reducing the safety of the energy storage device 100.

[0116] Please refer to Figure 20 again. In some embodiments, the energy storage device 100 also includes a wiring harness 80, which is used to electrically connect the multiple energy storage units 10. The wiring harness 80 is arranged on a side of at least one of the first thermal insulation member 50 and the second thermal insulation member 70 that is away from the explosion-proof valve 11.

[0117] It can be understood that the wiring harness 80 can be only provided on the side of the first thermal insulation member 50 facing away from the explosion-proof valve 11, or only provided on the side of the second thermal insulation member 70 facing away from the explosion-proof valve 11, or the wiring harness 80 can be provided on both the side of the first thermal insulation member 50 facing away from the explosion-proof valve 11 and the side of the second thermal insulation member 70 facing away from the explosion-proof valve 11.

[0118] In this embodiment, the wiring harness 80 is arranged on the side of at least one of the first thermal insulation member 50 and the second thermal insulation member 70 away from the explosion-proof valve 11, so that the wiring harness 80 can be separated from the drainage channel 101. When thermal runaway occurs in some energy storage units 10 of the energy storage device 100 and the explosion-proof valves 11 of some energy storage units 10 explode, and a large amount of high-temperature and high-pressure combustible gas in the energy storage unit 10 rushes out from the position of the explosion-proof valve 11, the wiring harness 80 can be separated from the high-temperature combustible gas to prevent the insulation layer of the wiring harness 80 from melting and short circuiting, thereby causing the thermal runaway to intensify and spread.

[0119] Referring again to FIG. 20 , in some embodiments, the energy storage device 100 further includes an electrical connector 90, which is disposed on a side of at least one of the first thermal insulation member 50 and the second thermal insulation member 70 facing away from the explosion-proof valve 11 and supported by the isolation plate 30, and is configured to electrically connect the multiple energy storage units 10 to the wiring harness 80. The electrical connector 90 can further stabilize the electrical connection between the multiple energy storage units.

[0120] It can be understood that the electrical connector 90 can be provided only on the side of the first thermal insulation member 50 facing away from the explosion-proof valve 11, or only on the side of the second thermal insulation member 70 facing away from the explosion-proof valve 11, or both the side of the first thermal insulation member 50 facing away from the explosion-proof valve 11 and the side of the second thermal insulation member 70 facing away from the explosion-proof valve 11 are provided with an electrical connector 90.

[0121] Optionally, the electrical connector 90 may be, but is not limited to, at least one of a copper busbar, a copper plate, an aluminum sheet, and the like.

[0122] Please refer to Figure 24. In some embodiments, the energy storage device 100 further includes a battery management unit 102. The battery management unit 102 is electrically connected to the wiring harness 80, and collects parameters of the energy storage unit 10 through the wiring harness 80 and controls the energy storage unit 10 to operate.

[0123] In other words, the battery management unit 102 is electrically connected to the electrical connector 90 through the wiring harness 80 , and is electrically connected to the plurality of energy storage units 10 through the electrical connector 90 .

[0124] Optionally, the parameters of the energy storage unit 10 may be, but are not limited to, parameter information such as current, voltage, charge and discharge rate, and capacity.

[0125] Optionally, the battery management unit 102 may be, but is not limited to, a controller, a processor, or the like. The processor includes one or more general-purpose processors, which may be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, and an ASIC. The processor is used to execute various types of digitally stored instructions, such as software or firmware programs stored in memory, enabling computing devices to provide a wide variety of services.

[0126] In some embodiments, the energy storage device 100 further includes a temperature sensor 103, which is disposed near the energy storage unit 10 and is electrically connected to the battery management unit 102. The temperature sensor 103 is configured to collect the temperature of the energy storage unit 10 under the control of the battery management unit 102 and transmit the collected temperature information to the battery management unit 102 so that the battery management unit 102 can control the operating status of the multiple energy storage units 10 according to the temperature signal; for example, when the temperature exceeds a threshold, the energy storage device 100 is controlled to stop charging and discharging, etc., to avoid excessive temperature.

[0127] In one embodiment, the temperature sensor 103 is disposed on a surface of the electrical connector 90 facing away from the energy storage unit 10 .

[0128] Optionally, the number of the temperature sensors 103 may be one or more. When the number of the temperature sensors 103 is plural, the plurality of temperature sensors 103 are arranged at intervals on the periphery of the plurality of energy storage units 10 .

[0129] Mentioning "embodiments" and "implementation methods" in this application means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, unless there is a contradiction between them.

[0130] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the above preferred implementation modes, ordinary technicians in this field should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An energy storage device, wherein: include: A plurality of energy storage units, wherein the plurality of energy storage units are arranged in sequence along a first direction, and each of the energy storage units comprises an explosion-proof valve; An isolation plate, the isolation plate is located on one side of the plurality of energy storage units having the explosion-proof valve and extends along a first direction, the isolation plate having a plurality of air holes arranged at intervals along the first direction, each of the air holes being at least partially stacked with an explosion-proof valve, and different explosion-proof valves being stacked with different air holes; as well as A first thermal insulation member and a second thermal insulation member, the first thermal insulation member and the second thermal insulation member are located on the same side of the isolation plate away from the multiple energy storage units, the first thermal insulation member and the second thermal insulation member are spaced apart along the second direction on opposite sides of the explosion-proof valve, the first thermal insulation member, the second thermal insulation member and the isolation plate enclose a drainage channel, the opposite ends of the drainage channel are connected to the external environment and connected to the space of the explosion-proof valve facing the isolation plate, wherein the first direction intersects with the second direction.

2. The energy storage device according to claim 1, wherein: The first thermal insulation component includes a first thermal insulation part and a second thermal insulation part that are connected, and the first thermal insulation part and the second thermal insulation part are arranged along the first direction; the second thermal insulation component includes a third thermal insulation part and a fourth thermal insulation part that are connected, and the third thermal insulation part and the fourth thermal insulation part are arranged along the first direction; the first thermal insulation part and the third thermal insulation part are arranged facing each other, and the distance between the first thermal insulation part and the third thermal insulation part gradually increases from one end close to the second thermal insulation part and the fourth thermal insulation part toward away from the second thermal insulation part and the fourth thermal insulation part; the second thermal insulation part and the fourth thermal insulation part are arranged facing each other, and the distance between the second thermal insulation part and the fourth thermal insulation part gradually increases from one end close to the first thermal insulation part and the third thermal insulation part toward away from the first thermal insulation part and the third thermal insulation part.

3. The energy storage device according to claim 2, wherein: The range of angle α between the surface of the first insulation part facing the third insulation part and the surface of the third insulation part facing the first insulation part is: 5°≤α≤30°; the range of angle β between the surface of the second insulation part facing the fourth insulation part and the surface of the fourth insulation part facing the second insulation part is: 5°≤β≤30°.

4. The energy storage device according to claim 1, wherein: The range of the minimum distance d between the first thermal insulation member and the second thermal insulation member is: 8mm≤d≤25mm.

5. The energy storage device according to claim 1, wherein: The isolation plate includes a main body, a first mounting part, a second mounting part, a third mounting part and a fourth mounting part, the main body having a plurality of air holes arranged at intervals along a first direction, the first mounting part, the second mounting part, the third mounting part and the fourth mounting part are sequentially spaced along the second direction on the surface of the main body away from the plurality of energy storage units, the first mounting part and the second mounting part are arranged on the same side of the explosion-proof valve, the main body, the first mounting part and the second mounting part enclose a first assembly groove, and the first assembly groove is used to set the first thermal insulation part; the third mounting part and the fourth mounting part are both arranged on the side of the explosion-proof valve away from the first mounting part and the second mounting part, the main body, the third mounting part and the fourth mounting part enclose a second assembly groove, and the second assembly groove is used to set the second thermal insulation part.

6. The energy storage device according to claim 5, wherein: The energy storage device further comprises a frame and a cover plate, wherein the frame has a receiving groove, wherein the receiving groove is used to receive the plurality of energy storage units, the isolation plate, the first heat insulating member and the second heat insulating member, and the cover plate closes the receiving groove and is fixed to the frame; The isolation plate also includes a first elastic portion and a second elastic portion, and the first elastic portion and the second elastic portion are both arranged on the surface of the main body facing away from the multiple energy storage units; the first elastic portion is at least partially located in the first assembly groove, and is used to abut the first thermal insulation member so that the end surface of the first thermal insulation member facing away from the first elastic portion is tightly fitted into the surface of the cover plate facing the receiving groove; the second elastic portion is at least partially located in the second assembly groove, and is used to abut the second thermal insulation member so that the end surface of the second thermal insulation member facing away from the second elastic portion is tightly fitted into the surface of the cover plate facing the receiving groove.

7. The energy storage device according to claim 6, wherein: The first elastic portion includes a first supporting sub-portion and a first protruding sub-portion, the first supporting sub-portion is connected to the surface of the main body facing the first thermal insulation component, the first protruding sub-portion is protruded on the surface of the first supporting sub-portion away from the main body, and is used to resist the first thermal insulation component, along the arrangement direction of the first supporting sub-portion and the first protruding sub-portion, the range of the height h1 of the first protruding sub-portion is: 0.5mm≤h1≤1.5mm; the second elastic portion includes a second supporting sub-portion and a second protruding sub-portion, the second supporting sub-portion is connected to the surface of the main body facing the second thermal insulation component, the second protruding sub-portion is protruded on the surface of the second supporting sub-portion away from the main body, and is used to resist the second thermal insulation component, along the arrangement direction of the second supporting sub-portion and the second protruding sub-portion, the range of the height h2 of the second protruding sub-portion is: 0.5mm≤h2≤1.5mm.

8. The energy storage device according to claim 6, wherein: The elastic modulus E1 of the first elastic part is in the range of 2.0 GPa≤E1≤2.5 GPa; the elastic modulus E2 of the second elastic part is in the range of 2.0 GPa≤E2≤2.5 GPa.

9. The energy storage device according to claim 7, wherein: The connection between the first supporting sub-section and the first protruding sub-section has a first arc-shaped transition surface, and the range of the curvature radius R1 of the first arc-shaped transition surface is: 0.5mm≤R1≤1.5mm; the connection between the second supporting sub-section and the second protruding sub-section has a second arc-shaped transition surface, and the range of the curvature radius R2 of the second arc-shaped transition surface is: 0.5mm≤R2≤1.5mm.

10. The energy storage device according to claim 1, wherein: The energy storage device further includes a wiring harness, the wiring harness is used to electrically connect the plurality of energy storage units, and the wiring harness is disposed on a side of at least one of the first thermal insulation member and the second thermal insulation member away from the explosion-proof valve; The energy storage device further includes a battery management unit, which is electrically connected to the wiring harness and collects parameters of the energy storage unit through the wiring harness and controls the energy storage unit to operate.

11. An electricity system, wherein: include: Electrical equipment; as well as The energy storage device according to any one of claims 1 to 10, wherein the energy storage device supplies power to the electrical equipment.

12. An energy storage system, wherein: include: An electric energy conversion device, the electric energy conversion device is used to convert other forms of energy into electric energy; The energy storage device according to any one of claims 1 to 10, wherein the energy storage device is electrically connected to the electric energy conversion device and is used to store the electric energy of the electric energy conversion device; and An electrical load, wherein the electrical load is electrically connected to the electric energy conversion device and the energy storage device respectively, and is used to work using the electric energy of the electric energy conversion device or the energy storage device.

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