Energy storage device and manufacturing method thereof

Abstract

The invention relates to an energy storage device and a manufacturing method thereof. The energy storage device comprises a box body, a plurality of single batteries and a porous supporting piece, the box body is provided with a containing cavity, and a liquid working medium is arranged in the containing cavity. The plurality of battery monomers are arranged in the accommodating cavity, a gap is formed between every two adjacent battery monomers, the porous supporting piece is arranged in the gap, the two opposite sides of the porous supporting piece are respectively propped against the side walls of the two adjacent battery monomers, the porous supporting piece is provided with a plurality of capillary through holes, and the two ends of each capillary through hole respectively extend to the top and the bottom of the porous supporting piece; and the capillary through holes are used for circulating a liquid working medium. The energy storage device and the manufacturing method thereof have the advantages of being small in potential safety hazard and high in stability.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage equipment, and in particular to an energy storage device and a method for manufacturing the same. Background Art

[0002] With the development of new power systems, sodium-ion batteries have been widely used due to their abundant resource base and low cost advantages.

[0003] However, sodium-ion batteries tend to generate a lot of heat during high-efficiency charge and discharge cycles, which can lead to a decline in battery performance, shortened lifespan, and even safety hazards. In addition, as the number of sodium-ion battery cycles increases, the side reactions that occur inside the battery are accompanied by the generation of gas, which in turn causes the sodium-ion battery to swell, which is also a key factor affecting the stability and reliability of sodium-ion batteries. Therefore, current energy storage devices based on sodium-ion batteries have the defects of large safety hazards and poor stability. Summary of the invention

[0004] Based on this, it is necessary to provide an energy storage device and a manufacturing method thereof to address the problems of great safety hazards and poor stability of energy storage devices.

[0005] In a first aspect, an energy storage device is provided, comprising:

[0006] A box body, wherein the box body is provided with a containing cavity, and the containing cavity is provided with a liquid working medium;

[0007] A plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodating cavity, and a gap is provided between adjacent battery cells;

[0008] And a porous support member, which is arranged in the gap, and the opposite sides of the porous support member respectively abut the side walls of two adjacent battery cells, and the porous support member is provided with a plurality of capillary holes, and the two ends of the capillary holes respectively extend to the top and bottom of the porous support member, and the capillary holes are used to circulate the liquid working medium.

[0009] In one embodiment, the battery cell is provided with an explosion-proof valve, which is arranged on the top cover of the battery cell and between the positive electrode and the negative electrode of the battery cell; or, the explosion-proof valve is arranged at the bottom of the battery cell.

[0010] In one embodiment, the battery cell is provided with an explosion-proof valve, and the explosion-proof valve is spaced apart from the top cover of the battery cell;

[0011] The porous support member also includes a spacer portion, which is arranged at the top of the porous support member. The spacer portion includes a connecting piece, a first spacer and a second spacer. The connecting piece is connected to the top of the porous support member, the first spacer is connected to one end of the connecting piece, and the second spacer is connected to the other end of the connecting piece. The first spacer and the second spacer are respectively arranged on opposite sides of the porous support member, and the spacers on both sides of the battery cell enclose the explosion-proof valve.

[0012] In one embodiment, the connecting sheet, the first spacer sheet and the second spacer sheet are integrally connected.

[0013] In one embodiment, the energy storage device also includes a condenser, which is arranged at the top of the accommodating chamber. The condenser is provided with a reflux pipe, one end of the reflux pipe is connected to the condenser, and the other end of the reflux pipe is arranged at the bottom of the accommodating chamber. The condenser is used to condense the vaporized liquid working medium and reflux it to the bottom of the accommodating chamber through the reflux pipe.

[0014] In one embodiment, the energy storage device further includes a cover plate, the box body is provided with an inlet and outlet, the inlet and outlet are communicated with the accommodating cavity, the inlet and outlet cover is provided in the accommodating cavity, and the cover plate is connected to the box body via a fastener.

[0015] In one embodiment, the cover plate is a condensation plate, and the condensation plate and the box body are provided with a reflux channel, and the reflux channel is connected to the bottom of the accommodating cavity. The condensation plate is used to condense the vaporized liquid working medium and return it to the bottom of the accommodating cavity through the reflux channel.

[0016] In one of the embodiments, a handle is provided on an outer side of the box.

[0017] In one embodiment, the porous support member includes a plurality of fiber bundles, each fiber bundle is provided with the capillary pores, the fiber bundles are arranged in the same direction or in an intersecting arrangement, and the gaps between the fiber bundles are filled with a curing agent.

[0018] In a second aspect, a method for manufacturing an energy storage device is provided, which is applicable to the energy storage device described in any of the above embodiments, and the method comprises:

[0019] A plurality of battery cells are arranged in a receiving cavity of the box body, and a porous support member is arranged in the gap between the battery cells;

[0020] Wherein, the manufacturing method of the porous support member comprises:

[0021] The fiber bundles are placed in the mold in the same direction or in an intersecting arrangement;

[0022] Under the conditions of pressing temperature and pressing pressure, the fiber bundles are preliminarily pressed so that the fiber bundles are in contact with each other and partially combined in the mold;

[0023] The fiber bundles after preliminary pressing are immersed in the curing agent to ensure that the curing agent evenly penetrates into the pores between the fiber bundles;

[0024] The fiber bundles are cured under the curing temperature to harden the curing agent between the fiber bundles;

[0025] performing secondary pressing on the impregnated and cured porous support;

[0026] Sintering or high temperature treating the porous support after secondary pressing;

[0027] The porous support is subjected to surface treatment, wherein the surface treatment is polishing, coating or heat treatment.

[0028] The above energy storage device and its manufacturing method are provided with a liquid working medium in the accommodating cavity of the box body, and the battery cell is arranged in the accommodating cavity of the box body, and the battery cell is arranged in a fixed gap, and a porous support is arranged in the gap so that the side of the battery cell abuts the porous support. Among them, the porous support is provided with a plurality of capillary through holes, and these capillary through holes have a flow-conducting and capillary effect, which can absorb the liquid working medium at the bottom and evenly distribute it inside the entire porous support. When the heat generated by the battery cell is conducted to the porous support, the liquid working medium absorbs the heat and evaporates, thereby taking away the heat and achieving the cooling effect of the battery cell. During the operation of the energy storage device, the liquid working medium in the porous support absorbs the heat generated by the battery cell and gradually evaporates. The phase change thermal effect brought by the evaporation greatly enhances the cooling effect. At the same time, the porous support can provide effective support and limiting effect on the side of the battery cell, avoid deformation of the battery cell due to thermal expansion, and effectively maintain the stability of the battery cell. It has the advantages of small safety hazards and high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic diagram of the structure of an energy storage device according to an embodiment of the present application.

[0030] FIG2 is a schematic diagram of the structure of a porous support member of an energy storage device according to an embodiment of the present application.

[0031] FIG3 is an enlarged structural schematic diagram of the porous support member of the energy storage device described in an embodiment of the present application.

[0032] Figure Number:

[0033] 100, box body; 100A, accommodating cavity; 110, cover plate; 120, handle;

[0034] 200, battery cell; 210, explosion-proof valve;

[0035] 300, porous support member; 310, spacer; 311, connecting sheet; 312, first spacer; 313, second spacer; 320, fiber bundle; 320A, capillary through hole; 330, curing agent;

[0036] 400. Condenser; 410. Reflux pipe. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] Referring to FIG. 1 and FIG. 3, FIG. 1 and FIG. 3 show schematic diagrams of the energy storage device and the porous support member 300 in an embodiment of the present application. The energy storage device provided in an embodiment of the present application includes a box 100, a plurality of battery cells 200 and a porous support member 300. The box 100 is a cubic structure, and the box 100 is provided with a receiving cavity 100A, and a liquid working medium is provided inside the receiving cavity 100A. The battery cell 200 is a cubic structure, and a plurality of battery cells 200 are arranged in the receiving cavity 100A. The battery cells 200 can be arranged in an array, and the large surfaces of adjacent battery cells 200 are provided with gaps of the same distance. The porous support member 300 is disposed in the gap between the large surfaces of adjacent battery cells 200, and the opposite sides of the porous support member 300 respectively abut against the side walls of two adjacent battery cells 200. The porous support member 300 is provided with a plurality of capillary through holes 320A, and the two ends of the capillary through holes 320A respectively extend to the top and the bottom of the porous support member 300, and the capillary through holes 320A are used to circulate liquid working medium. In an exemplary embodiment, the battery cell 200 is a sodium ion battery.

[0044] The energy storage device described in the embodiment of the present application is provided with a liquid working medium inside the accommodating cavity 100A of the box body 100, and multiple battery cells 200 are arranged in the accommodating cavity 100A of the box body 100, and the battery cells 200 are arranged in a fixed gap, and a porous support member 300 is arranged in the gap so that the side of the battery cell 200 abuts against the porous support member 300. Among them, the porous support member 300 is provided with a plurality of capillary through holes 320A, and these capillary through holes 320A have a diversion and capillary effect, which can absorb the liquid working medium at the bottom of the accommodating cavity 100A and evenly distribute it inside the entire porous support member 300. When the heat generated by the battery cell 200 is conducted to the porous support member 300, the liquid working medium absorbs the heat and evaporates and is discharged from the porous support member 300, thereby taking away the heat and achieving a cooling effect on the battery cell 200.

[0045] In the energy storage device described in the embodiment of the present application, during the operation of the energy storage device, the liquid working fluid in the porous support member 300 absorbs the heat generated by the battery cell 200 and gradually evaporates. The phase change thermal effect brought about by the evaporation greatly enhances the cooling effect. At the same time, the porous support member 300 can provide effective support and limitation to the lateral direction of the battery cell, avoiding deformation of the battery cell 200 due to thermal expansion, thereby effectively maintaining the stability of the battery cell 200, and has the advantages of small safety hazards and high stability.

[0046] In some embodiments, as shown in FIG1 , the battery cell 200 includes a shell, a top cover and a battery cell, the battery cell is arranged in the shell, the top cover is provided with the positive and negative electrodes of the battery cell 200, and the top cover sealing cover is provided at the opening of the shell, so that the battery cell is sealed in the shell. In this embodiment, the battery cell 200 is provided with an explosion-proof valve 210, which is provided on the top cover of the battery cell 200, and the explosion-proof valve 210 is provided between the positive and negative electrodes of the battery cell 200. By providing the explosion-proof valve 210 on the top of the battery cell 200, the gas and heat generated inside the battery cell 200 during the charging and discharging process may cause the battery cell 200 to explode. Therefore, when the internal pressure of the battery cell 200 is too high, the explosion-proof valve 210 automatically opens to release the excess gas inside, thereby effectively preventing the battery cell 200 from exploding due to excessive internal pressure, thereby improving the safety performance of the battery cell 200.

[0047] In other embodiments, the explosion-proof valve 210 may also be disposed at the bottom of the battery cell 200. The explosion-proof valve 210 is disposed at the bottom, and can also release excess gas inside when the internal pressure is too high, thereby effectively preventing the battery cell 200 from exploding due to excessive internal pressure, and improving the safety performance of the battery cell 200.

[0048] As shown in FIG. 2 , FIG. 2 shows a schematic diagram of the structure of a porous support 300 of an energy storage device in an embodiment of the present application. In an optional embodiment, the porous support 300 further includes a spacer 310, which is disposed at the top of the porous support 300. Specifically, the spacer 310 includes a connecting sheet 311, a first spacer 312, and a second spacer 313. The connecting sheet 311 is connected to the top of the porous support 300, the first spacer 312 is connected to one end of the connecting sheet 311, and the second spacer 313 is connected to the other end of the connecting sheet 311. The first spacer 312 and the second spacer 313 are respectively disposed on opposite sides of the porous support 300, and the spacers 310 on both sides of the battery cell 200 are disposed to enclose the explosion-proof valve 210 together. By arranging the spacer 310 on the top of the porous support 300, the explosion-proof valve 210 is spaced apart by the spacers 310 on both sides. Specifically, the first spacer 312 and the second spacer 313 are respectively arranged on opposite sides of the porous support 300, that is, extending from the connecting piece 311 to the two sides relative to the explosion-proof valve 210, enclosing the explosion-proof valve 210, thereby isolating the explosion-proof valve 210, and the spacer 310 is a part of the porous support 300, which also contains liquid working fluid, which can block and cool the products ejected from the explosion-proof valve 210 after thermal runaway, thereby effectively preventing the spread of thermal runaway and improving the safety of the energy storage device.

[0049] In an optional embodiment, as shown in Fig. 2, the connecting sheet 311, the first spacer 312 and the second spacer 313 are integrally connected. The spacer 310 can be formed by cutting and bending the top of the porous support 300, so the connecting sheet 311, the first spacer 312 and the second spacer 313 are integrally connected to the porous support 300, and the internal capillary through hole 320A can also transmit the liquid working medium to the spacer 310. The integrated processing technology of this embodiment has the advantage of convenient processing.

[0050] In some embodiments, as shown in FIG1 , the energy storage device further includes a condenser 400, which is disposed at the top of the accommodating chamber 100A. The condenser 400 is provided with a reflux pipe 410, one end of which is connected to the condenser 400, and the other end of which is disposed at the bottom of the accommodating chamber 100A. The condenser 400 is used to condense the vaporized liquid working medium and reflux it to the bottom of the accommodating chamber 100A through the reflux pipe 410. By arranging the condenser 400 at the top of the accommodating chamber 100A, when the vaporized gas working medium encounters the condenser 400, it will be cooled and recondensed into a liquid state, and then reflux to the bottom of the accommodating chamber 100A through the reflux pipe 410, so that the liquid working medium is recycled, and the cooling effect of the energy storage device is significant.

[0051] In other embodiments, as shown in FIG1 , the energy storage device further includes a cover plate 110, the box body 100 is provided with an inlet and outlet, the inlet and outlet are communicated with the accommodating chamber 100A, the cover plate 110 is covered on the inlet and outlet, and the cover plate 110 is connected to the box body 100 through a fastener. By providing a detachable cover plate 110 on the top of the box body 100, the box body 100 is sealed, and the fastener connection method facilitates the assembly or maintenance of the energy storage device.

[0052] Furthermore, the cover plate 110 is configured as a condensation plate, and the condensation plate and the housing 100 are provided with a reflux channel, which is connected to the bottom of the accommodating chamber 100A. The condensation plate is used to condense the vaporized liquid working medium and reflux it to the bottom of the accommodating chamber 100A through the reflux channel. By configuring the cover plate 110 as a condensation plate, there is no need to configure the condenser 400, and the vaporized gas working medium can be directly condensed through the condensation plate on the top, and the condensed liquid working medium can be transported back to the bottom of the accommodating chamber 100A through the reflux channel for recycling. The configuration of the condensation plate and the reflux channel can make the energy storage device more integrated and occupy less space.

[0053] In an optional embodiment, as shown in Fig. 1, a handle 120 is provided on an outer side of the box body 100. The box body 100 is provided with the handle 120, so that the box body 100 can be conveniently taken.

[0054] In an optional embodiment, as shown in FIG3 , the porous support 300 includes a plurality of fiber bundles 320 , each of which is provided with a capillary through hole 320A, and the fiber bundles 320 are arranged in the same direction or intersectingly, and the gaps between the fiber bundles 320 are filled with a curing agent 330 . Different arrangements can achieve different mechanical properties and pore structures. The fiber bundles 320 of this embodiment can form a porous structure through specific processing, and the porosity of the porous support 300 can reach a high level, which is conducive to absorbing liquid working fluids, thereby improving the heat dissipation capacity of the energy storage device. Moreover, the fiber bundles 320 can also effectively improve the mechanical properties of the porous support 300 . When subjected to the mechanical action of the battery cells 200 on both sides, the fiber bundles 320 can bear part of the stress, thereby preventing the porous support 300 from deforming, and has the advantages of high porosity and high overall strength.

[0055] In an exemplary embodiment, the curing agent 330 may be a resin, a ceramic or a metal. If the curing agent 330 is a resin, a heat treatment is required to improve the thermal stability of the resin. If the curing agent 330 is a ceramic or a metal, a high-temperature sintering treatment is required to make the connection between the fiber bundles 320 more firm and form a final porous structure.

[0056] In an exemplary embodiment, the fiber bundle 320 may be made of one or a combination of carbon fiber, metal fiber, ceramic fiber, or polyimide fiber.

[0057] On the other hand, the present application also provides a method for manufacturing an energy storage device, which is applicable to the energy storage device of any of the above embodiments, and the method comprises:

[0058] A plurality of battery cells 200 are arranged in the receiving cavity 100A of the box body 100, and a porous support member 300 is disposed in the gaps between the battery cells 200;

[0059] The method for manufacturing the porous support member 300 comprises the following steps:

[0060] S100: placing the fiber bundles 320 in the mold in the same direction or in an intersecting arrangement. According to needs, the fiber bundles 320 may be arranged in a unidirectional manner or in an intersecting manner to achieve different mechanical properties and pore structures.

[0061] S200: Preliminarily pressing the fiber bundle 320 under the conditions of pressing temperature and pressing pressure, so that the fiber bundle 320 contacts and partially combines with each other in the mold to form a preliminary porous structure;

[0062] S300: Immersing the preliminarily pressed fiber bundle 320 in the curing agent 330 to ensure that the curing agent 330 evenly penetrates into the pores between the fiber bundles 320;

[0063] S400: curing the fiber bundles 320 at a curing temperature to harden the curing agent 330 between the fiber bundles 320 to form a stable porous structure;

[0064] S500: performing secondary pressing on the porous support member 300 after impregnation and curing to further improve the density and mechanical properties of the porous support member 300 while maintaining the desired porosity;

[0065] S600: Sintering or high-temperature treatment is performed on the porous support member 300 after secondary pressing. The curing agent 330 using ceramic or metal slurry is subjected to high-temperature sintering treatment to make the connection between the fiber bundles more firm and form a final porous structure. The curing agent 330 using resin material can be heat-treated to improve the thermal stability of the material.

[0066] S700: performing surface treatment on the porous support member 300, such as polishing, coating or heat treatment, to improve its surface properties and service life.

[0067] The manufacturing method of the energy storage device described in the embodiment of the present application, wherein the manufacturing method of the porous support member 300 is to form a porous support member 300 having a one-way transmission function in the plane direction and a heat conduction and support function in the thickness direction through the steps of fiber bundle arrangement, preliminary pressing, impregnation, curing, secondary pressing, sintering or high temperature treatment and surface treatment, and the porous support member 300 is arranged in the gap between the battery cells 200. During the operation of the energy storage device, the liquid working medium in the porous support member 300 absorbs the heat generated by the battery cells 200 and gradually evaporates. The phase change thermal effect brought about by the evaporation greatly enhances the cooling effect. At the same time, the porous support member 300 can effectively maintain the spacing between the battery cells 200, avoid deformation of the battery cells 200 due to thermal expansion, thereby effectively maintaining the stability of the battery cells 200, and has the advantages of good heat dissipation effect and high stability.

[0068] The energy storage device and the manufacturing method thereof described in the embodiments of the present application have the following beneficial effects:

[0069] 1. During the operation of the energy storage device, the liquid working fluid in the porous support member 300 absorbs the heat generated by the battery cell 200 and gradually evaporates. The phase change thermal effect brought about by the evaporation greatly enhances the cooling effect. At the same time, the porous support member 300 can effectively maintain the spacing between the battery cells 200, avoiding deformation of the battery cells 200 due to thermal expansion, thereby effectively maintaining the stability of the battery cells 200, and has the advantages of good heat dissipation effect and high stability.

[0070] 2. The explosion-proof valve 210 is enclosed and separated by the first spacer 312 and the second spacer 313 of the spacer 310, and the spacer 310 also contains liquid working fluid, which can block and cool the products ejected from the explosion-proof valve 210 after thermal runaway, thereby effectively preventing the spread of thermal runaway and improving the safety of the energy storage device.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An energy storage device, characterized in that: include: A box body (100), the box body (100) being provided with a containing chamber (100A), the containing chamber (100A) being provided with a liquid working medium; A plurality of battery cells (200), wherein the plurality of battery cells (200) are arranged in the accommodating cavity (100A), and gaps are provided between adjacent battery cells (200); and A porous support member (300), the porous support member (300) being arranged in the gap, the opposite sides of the porous support member (300) respectively abutting against the side walls of two adjacent battery cells (200), the porous support member (300) being provided with a plurality of capillary through holes (320A), the two ends of the capillary through holes (320A) respectively extending to the top and the bottom of the porous support member (300), the capillary through holes (320A) being used for circulating the liquid working medium.

2. The energy storage device according to claim 1, characterized in that: The battery cell (200) is provided with an explosion-proof valve (210), the explosion-proof valve (210) being arranged on the top cover of the battery cell (200), and the explosion-proof valve (210) being arranged between the positive electrode and the negative electrode of the battery cell (200); or the explosion-proof valve (210) being arranged at the bottom of the battery cell (200).

3. The energy storage device according to claim 1, characterized in that: The battery cell (200) is provided with an explosion-proof valve (210), and the explosion-proof valve (210) is arranged on the top cover of the battery cell (200); The porous support member (300) further comprises a spacer (310), wherein the spacer (310) is arranged at the top of the porous support member (300), and the spacer (310) comprises a connecting sheet (311), a first spacer (312) and a second spacer (313), wherein the connecting sheet (311) is connected to the top of the porous support member (300), the first spacer (312) is connected to one end of the connecting sheet (311), and the second spacer (313) is connected to the other end of the connecting sheet (311), and the first spacer (312) and the second spacer (313) are respectively arranged on opposite sides of the porous support member (300), and the spacers (310) on both sides of the battery cell (200) are arranged to enclose the explosion-proof valve (210).

4. The energy storage device according to claim 3, characterized in that: The connecting sheet (311), the first spacer sheet (312) and the second spacer sheet (313) are integrally connected.

5. The energy storage device according to claim 1, characterized in that: The energy storage device further comprises a condenser (400), wherein the condenser (400) is arranged at the top of the accommodating chamber (100A), and the condenser (400) is provided with a reflux pipe (410), one end of the reflux pipe (410) is connected to the condenser (400), and the other end of the reflux pipe (410) is arranged at the bottom of the accommodating chamber (100A), and the condenser (400) is used to condense the vaporized liquid working medium and reflux it to the bottom of the accommodating chamber (100A) through the reflux pipe (410).

6. The energy storage device according to claim 1, characterized in that: The energy storage device further comprises a cover plate (110); the box body (100) is provided with an inlet and an outlet, the inlet and the outlet are in communication with the accommodating cavity (100A); the cover plate (110) covers the inlet and the outlet, and the cover plate (110) is connected to the box body (100) via a fastener.

7. The energy storage device according to claim 6, characterized in that: The cover plate (110) is a condensation plate. The condensation plate and the box body (100) are provided with a reflux channel. The reflux channel is connected to the bottom of the accommodating chamber (100A). The condensation plate is used to condense the vaporized liquid working medium and reflux it to the bottom of the accommodating chamber (100A) through the reflux channel.

8. The energy storage device according to claim 1, characterized in that: A handle (120) is provided on an outer side surface of the box body (100).

9. The energy storage device according to any one of claims 1 to 8, characterized in that: The porous support member (300) comprises a plurality of fiber bundles (320), each fiber bundle (320) being provided with the capillary through hole (320A), the fiber bundles (320) being arranged in the same direction or intersectingly, and the gaps between the fiber bundles (320) being filled with a curing agent (330).

10. A method for manufacturing an energy storage device, applicable to the energy storage device according to any one of claims 1 to 9, characterized in that: The method comprises: A plurality of battery cells (200) are arranged in a receiving cavity (100A) of a box body (100), and a porous support member (300) is provided in the gaps between the battery cells (200); Wherein, the manufacturing method of the porous support member (300) comprises: The fiber bundles (320) are placed in a mold in the same direction or in an intersecting arrangement; Under the conditions of pressing temperature and pressing pressure, the fiber bundle (320) is preliminarily pressed so that the fiber bundles (320) are in contact with each other and partially bonded in the mold; The fiber bundle (320) after preliminary pressing is immersed in a curing agent (330), and the curing agent (330) is ensured to evenly penetrate into the pores between the fiber bundles (320); Curing the fiber bundle (320) at a curing temperature to harden the curing agent (330) between the fiber bundles (320); Performing secondary pressing on the porous support member (300) after impregnation and curing; Sintering or high-temperature treating the porous support member (300) after the secondary pressing; The porous support (300) is subjected to surface treatment, wherein the surface treatment is polishing, coating or heat treatment.

Images