Energy storage device and method of manufacturing the same

Abstract

This application relates to an energy storage device and its manufacturing method. The energy storage device of this application includes a housing, multiple battery cells, and a porous support member. The housing has a receiving cavity containing a liquid working fluid. Multiple battery cells are disposed within the receiving cavity, with gaps between adjacent battery cells. The porous support member is disposed within these gaps, with its opposite sides abutting against the sidewalls of two adjacent battery cells. The porous support member has multiple capillary through-holes, with both ends extending to the top and bottom of the porous support member, respectively, for the flow of the liquid working fluid. The energy storage device and its manufacturing method of this application have the advantages of low safety risks and high stability.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, and in particular to an energy storage device and its manufacturing method. Background Technology

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

[0003] However, sodium-ion batteries easily generate a large amount of heat during high-efficiency charge-discharge cycles, which can lead to decreased battery performance, shortened lifespan, and even safety hazards. Furthermore, as the number of cycles increases, internal side reactions generate gases, causing the sodium-ion battery to expand, which is also a key factor affecting its stability and reliability. Therefore, current energy storage devices based on sodium-ion batteries suffer from significant safety risks and poor stability. Summary of the Invention

[0004] Therefore, it is necessary to provide an energy storage device and its manufacturing method to address the problems of significant safety hazards and poor stability in energy storage devices.

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

[0006] The housing has a receiving cavity containing a liquid working fluid;

[0007] Multiple battery cells are disposed in the accommodating cavity, and gaps are provided between adjacent battery cells;

[0008] The porous support is disposed in the gap, and its opposite sides abut against the sidewalls of two adjacent battery cells. The porous support is provided with a plurality of capillary through holes, the two ends of which extend to the top and bottom of the porous support, respectively. The capillary through holes are used to circulate the liquid working fluid.

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

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

[0011] The porous support also includes a spacer portion disposed on the top of the porous support. 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. 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 disposed on opposite sides of the porous support. The spacers on both sides of the battery cell surround the explosion-proof valve.

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

[0013] In one embodiment, the energy storage device further includes a condenser disposed at the top of the accommodating cavity. The condenser is provided with a return pipe, one end of which is connected to the condenser and the other end of which is disposed at the bottom of the accommodating cavity. The condenser is used to condense the vaporized liquid working fluid and return it to the bottom of the accommodating cavity through the return pipe.

[0014] In one embodiment, the energy storage device further includes a cover plate, the housing has an inlet and outlet, the inlet and outlet communicate with the receiving cavity, the inlet and outlet cover the receiving cavity, and the cover plate is connected to the housing by fasteners.

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

[0016] In one embodiment, a handle is provided on one outer side of the housing.

[0017] In one embodiment, the porous support includes a plurality of fiber bundles, each fiber bundle being provided with the capillary through-hole, the fiber bundles being arranged in the same direction or intersecting each other, and the gaps between the fiber bundles being filled with a curing agent.

[0018] Secondly, a method for manufacturing an energy storage device is provided, applicable to the energy storage device described in any of the above embodiments, the method comprising:

[0019] Multiple battery cells are arranged and placed inside the housing cavity of the box, and porous support components are installed between the battery cells;

[0020] The manufacturing method of the porous support includes:

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

[0022] Under the conditions of pressing temperature and pressing pressure, the fiber bundles are initially pressed, so that the fiber bundles come into contact with each other and partially combine in the mold.

[0023] The initially compressed fiber bundles are impregnated in a curing agent to ensure that the curing agent penetrates evenly into the pores between the fiber bundles;

[0024] Under the curing temperature conditions, the fiber bundles are cured, causing the curing agent between the fiber bundles to harden.

[0025] The porous support component after impregnation and curing is subjected to secondary pressing;

[0026] The porous support component after secondary pressing is sintered or subjected to high-temperature treatment.

[0027] The porous support is subjected to surface treatment, which may be polishing, coating, or heat treatment.

[0028] The aforementioned energy storage device and its manufacturing method involve placing a liquid working medium within the housing cavity of the casing, and then arranging individual battery cells within this cavity in a fixed, spaced-apart configuration. A porous support member is positioned within these gaps, with the sides of the battery cells abutting against the support member. This porous support member has multiple capillary holes that act as guides and capillary forces, drawing in the liquid working medium from the bottom and distributing it evenly throughout the support member. When heat generated by the battery cells is conducted to the support member, the liquid working medium absorbs and evaporates, thus carrying away the heat and cooling the battery cells. During operation, the liquid working medium in the porous support member absorbs and gradually evaporates the heat generated by the battery cells. The phase change heat effect from evaporation significantly enhances the cooling effect. Simultaneously, the porous support member provides effective lateral support and restraint for the battery cells, preventing deformation due to thermal expansion and effectively maintaining their stability. This design offers advantages such as low safety risks and high stability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the energy storage device described in the embodiments of this application.

[0030] Figure 2 This is a schematic diagram of the porous support component of the energy storage device described in the embodiments of this application.

[0031] Figure 3 This is an enlarged structural schematic diagram of the porous support component of the energy storage device described in the embodiments of this application.

[0032] Icon labels:

[0033] 100. Enclosure; 100A. Receiving cavity; 110. Cover plate; 120. Handle;

[0034] 200. Battery cell; 210. Explosion-proof valve;

[0035] 300. Porous support; 310. Spacer; 311. Connecting piece; 312. First spacer; 313. Second spacer; 320. Fiber bundle; 320A. Capillary pore; 330. Curing agent;

[0036] 400. Condenser; 410. Return pipe. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0043] See Figure 1 and Figure 3 , Figure 1 and Figure 3This diagram illustrates the structure of an energy storage device and a porous support 300 according to an embodiment of this application. The energy storage device provided in this embodiment includes a housing 100, multiple battery cells 200, and a porous support 300. The housing 100 has a cubic structure and includes a receiving cavity 100A containing a liquid working medium. Each battery cell 200 has a cubic structure and is disposed within the receiving cavity 100A. Specifically, the battery cells 200 can be arranged in an array, with equidistant gaps between the large faces of adjacent battery cells 200. The porous support 300 is disposed in the gaps between the large faces of adjacent battery cells 200. The opposite sides of the porous support 300 abut against the sidewalls of two adjacent battery cells 200. The porous support 300 has multiple capillary through-holes 320A, with both ends extending to the top and bottom of the porous support 300, respectively. The capillary through-holes 320A are used for the flow of the liquid working medium. In one exemplary embodiment, the battery cell 200 is a sodium-ion battery.

[0044] The energy storage device described in this application embodiment contains a liquid working medium inside a housing 100 cavity 100A. Multiple battery cells 200 are disposed within the housing 100 cavity 100A, arranged with fixed gaps between them. A porous support member 300 is disposed within these gaps, with the sides of the battery cells 200 abutting against the porous support member 300. The porous support member 300 has multiple capillary holes 320A, which have guiding and capillary functions, drawing in the liquid working medium from the bottom of the housing 100A and distributing it evenly throughout the porous support member 300. When heat generated by the battery cells 200 is conducted to the porous support member 300, the liquid working medium absorbs the heat and evaporates, discharging from the porous support member 300, thereby carrying away the heat and achieving a cooling effect on the battery cells 200.

[0045] In the energy storage device described in this application embodiment, during the operation of the energy storage device, the liquid working medium in the porous support 300 absorbs the heat generated by the battery cell 200 and gradually evaporates. The phase change heat effect brought about by evaporation greatly enhances the cooling effect. At the same time, the porous support 300 can provide effective lateral support and limiting for the battery cell, preventing the battery cell 200 from deforming due to thermal expansion, thereby effectively maintaining the stability of the battery cell 200. It has the advantages of low safety risk and high stability.

[0046] In some embodiments, such as Figure 1As shown, the battery cell 200 includes a housing, a top cover, and a battery cell. The battery cell is disposed within the housing. The top cover has the positive and negative terminals of the battery cell 200. A sealing cap is provided at the opening of the housing, thereby sealing the battery cell within the housing. In this embodiment, the battery cell 200 is equipped with an explosion-proof valve 210. The explosion-proof valve 210 is disposed on the top cover of the battery cell 200 and between the positive and negative terminals of the battery cell 200. By providing an explosion-proof valve 210 on the top of the battery cell 200, the gas and heat generated inside the battery cell 200 during charging and discharging 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, thereby effectively preventing the battery cell 200 from exploding due to excessive internal pressure and improving the safety performance of the battery cell 200.

[0047] In other embodiments, the explosion-proof valve 210 may also be located at the bottom of the battery cell 200. The explosion-proof valve 210, located at the bottom, can release excess gas 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] Combination Figure 2 As shown, Figure 2 A schematic diagram of the porous support 300 of an energy storage device according to one embodiment of this application is shown. In an optional embodiment, the porous support 300 further includes a spacer portion 310 disposed on the top of the porous support 300. Specifically, the spacer portion 310 includes a connecting piece 311, a first spacer portion 312, and a second spacer portion 313. The connecting piece 311 is connected to the top of the porous support 300, the first spacer portion 312 is connected to one end of the connecting piece 311, and the second spacer portion 313 is connected to the other end of the connecting piece 311. The first spacer portion 312 and the second spacer portion 313 are respectively disposed on opposite sides of the porous support 300. The spacer portions 310 on both sides of the battery cell 200 together enclose the explosion-proof valve 210. By providing the spacer portion 310 on the top of the porous support 300, the explosion-proof valve 210 is separated by the spacer portions 310 on both sides. Specifically, the first spacer 312 and the second spacer 313 are respectively arranged facing opposite sides of the porous support 300, that is, extending from the connecting piece 311 to both sides of the opposite explosion-proof valve 210, enclosing the explosion-proof valve 210, thereby separating the explosion-proof valve 210. Moreover, the spacer 310 is part of the porous support 300, and its interior also contains liquid working fluid, which can block and cool the products ejected by 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, such as Figure 2As shown, the connecting piece 311, the first spacer 312, and the second spacer 313 are integrally connected. The spacer portion 310 can be formed by cutting and bending the top of the porous support member 300. Therefore, the connecting piece 311, the first spacer 312, and the second spacer 313 are integrally connected with the porous support member 300. The internal capillary through-holes 320A can also transfer the liquid working fluid to the spacer portion 310. The integrated processing technology of this embodiment has the advantage of convenient processing.

[0050] In some embodiments, such as Figure 1 As shown, the energy storage device also includes a condenser 400, which is located at the top of the containment cavity 100A. The condenser 400 has a return pipe 410, one end of which is connected to the condenser 400, and the other end of which is located at the bottom of the containment cavity 100A. The condenser 400 is used to condense the vaporized liquid working fluid and return it to the bottom of the containment cavity 100A through the return pipe 410. By placing the condenser 400 at the top of the containment cavity 100A, when the evaporated gaseous working fluid encounters the condenser 400, it will be cooled and re-condensed into a liquid state, thus returning to the bottom of the containment cavity 100A through the return pipe 410, allowing the liquid working fluid to be recycled. The cooling effect of the energy storage device is significant.

[0051] In other embodiments, such as Figure 1 As shown, the energy storage device also includes a cover plate 110. The housing 100 has an inlet and outlet, which communicate with the accommodating cavity 100A. The cover plate 110 covers the inlet and outlet and is connected to the housing 100 by fasteners. By providing a removable cover plate 110 on the top of the housing 100, the housing 100 can be 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 condenser plate, and the condenser plate and the housing 100 are provided with a return channel, which communicates with the bottom of the receiving cavity 100A. The condenser plate is used to condense the vaporized liquid working fluid and return it to the bottom of the receiving cavity 100A through the return channel. By configuring the cover plate 110 as a condenser plate, there is no need to install a condenser 400. The evaporated gaseous working fluid can be directly condensed through the top condenser plate, and the condensed liquid working fluid is transported back to the bottom of the receiving cavity 100A for recycling through the return channel. The configuration of the condenser plate and the return channel allows for a higher degree of integration of the energy storage device and a smaller footprint.

[0053] In an optional embodiment, such as Figure 1 As shown, a handle 120 is provided on one outer side of the box 100. The handle 120 makes it easy to pick up and put down the box 100.

[0054] In an optional embodiment, such as Figure 3 As shown, the porous support 300 includes multiple fiber bundles 320, each fiber bundle 320 having a capillary through-hole 320A. The fiber bundles 320 are arranged in the same direction or intersecting each other, 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. In this embodiment, the fiber bundles 320 can be formed into a porous structure through specific processing, and the porosity of the resulting porous support 300 can reach a high level, which is beneficial for absorbing liquid working fluid, 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 have the advantages of high porosity and high overall strength.

[0055] In one exemplary embodiment, the curing agent 330 may be a resin, ceramic, or metal. If the curing agent 330 is a resin, heat treatment is required to improve the resin's thermal stability. If the curing agent 330 is a ceramic or metal, high-temperature sintering is required to strengthen the connections between the fiber bundles 320 and form the final porous structure.

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

[0057] On the other hand, this application also provides a method for manufacturing an energy storage device, applicable to the energy storage device of any of the above embodiments, the method comprising:

[0058] Multiple battery cells 200 are arranged and placed in the receiving cavity 100A of the housing 100, and porous support members 300 are provided between the gaps between the battery cells 200.

[0059] The manufacturing method of the porous support 300 includes the following steps:

[0060] S100: The fiber bundles 320 are placed in the mold in the same direction or intersecting. As needed, unidirectional or intersecting arrangement can be selected to achieve different mechanical properties and pore structures.

[0061] S200: Under the conditions of pressing temperature and pressing pressure, the fiber bundle 320 is initially pressed, so that the fiber bundle 320 comes into contact with each other and partially combines in the mold to form a preliminary porous structure.

[0062] S300: The initially compressed fiber bundles 320 are impregnated in curing agent 330 to ensure that the curing agent 330 is evenly penetrated into the pores between the fiber bundles 320;

[0063] S400: Under the curing temperature, the fiber bundle 320 is cured, so that the curing agent 330 between the fiber bundles 320 hardens and forms a stable porous structure.

[0064] S500: The porous support 300 after impregnation and curing is subjected to secondary pressing to further improve the density and mechanical properties of the porous support 300 while maintaining the required porosity.

[0065] S600: The porous support 300 after secondary pressing is sintered or subjected to high temperature treatment. The curing agent 330 using ceramic or metal paste is subjected to high temperature sintering treatment to make the connection between fiber bundles stronger and form the final porous structure. The curing agent 330 using resin material can be heat treated to improve the thermal stability of the material.

[0066] S700: The porous support 300 is surface treated, 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 this application involves manufacturing a porous support 300 through steps such as fiber bundle arrangement, preliminary pressing, impregnation, curing, secondary pressing, sintering or high-temperature treatment, and surface treatment. This forms a porous support 300 with unidirectional permeability in the planar direction and thermal conductivity and support functions in the thickness direction. The porous support 300 is then placed within the gaps between the battery cells 200. During operation of the energy storage device, the liquid working fluid in the porous support 300 absorbs the heat generated by the battery cells 200 and gradually evaporates. The phase change heat effect brought about by evaporation greatly enhances the cooling effect. Simultaneously, the porous support 300 effectively maintains the spacing between the battery cells 200, preventing deformation of the battery cells 200 due to thermal expansion, thereby effectively maintaining the stability of the battery cells 200. This method offers advantages such as good heat dissipation and high stability.

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

[0069] 1. During the operation of the energy storage device, the liquid working medium in the porous support 300 absorbs the heat generated by the battery cell 200 and gradually evaporates. The phase change heat effect brought about by evaporation greatly enhances the cooling effect. At the same time, the porous support 300 can effectively maintain the spacing between the battery cells 200, prevent the battery cells 200 from deforming due to thermal expansion, and thus effectively maintain the stability of the battery cells 200. It has the advantages of good heat dissipation 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. The spacer 310 also contains liquid working fluid, which can block and cool the products ejected by 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 embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An energy storage device, characterized in that, include: The housing (100) is provided with a receiving cavity (100A), and the receiving cavity (100A) is provided with a liquid working fluid; Multiple battery cells (200) are disposed in the accommodating cavity (100A), with gaps between adjacent battery cells (200); each battery cell (200) is equipped with an explosion-proof valve (210); and A porous support member (300) is disposed in the gap. The opposite sides of the porous support member (300) abut against the sidewalls of two adjacent battery cells (200). The porous support member (300) has multiple capillary through-holes (320A), with both ends of each capillary through-hole (320A) extending to the top and bottom of the porous support member (300), respectively. The capillary through-holes (320A) are used to circulate the liquid working fluid. The porous support member (300) also includes a spacer portion (310) disposed at the top of the porous support member (300). The spacer (310) includes a connecting piece (311), a first spacer (312), and a second spacer (313). The connecting piece (311) is connected to the top of the porous support (300). The first spacer (312) is connected to one end of the connecting piece (311), and the second spacer (313) is connected to the other end of the connecting piece (311). The first spacer (312) and the second spacer (313) are respectively arranged on opposite sides of the porous support (300). The spacer (310) on both sides of the battery cell (200) surrounds the explosion-proof valve (210).

2. The energy storage device according to claim 1, characterized in that: The explosion-proof valve (210) is disposed on the top cover of the battery cell (200), and the explosion-proof valve (210) is disposed between the positive and negative terminals of the battery cell (200).

3. The energy storage device according to claim 1, characterized in that: The explosion-proof valve (210) is located at the bottom of the battery cell (200).

4. The energy storage device according to claim 1, characterized in that: The connecting piece (311), the first spacer (312), and the second spacer (313) are integrally connected.

5. The energy storage device according to claim 1, characterized in that: The energy storage device also includes a condenser (400), which is located at the top of the accommodating cavity (100A). The condenser (400) is provided with a return pipe (410), one end of which is connected to the condenser (400) and the other end of which is located at the bottom of the accommodating cavity (100A). The condenser (400) is used to condense the vaporized liquid working fluid and return it to the bottom of the accommodating cavity (100A) through the return pipe (410).

6. The energy storage device according to claim 1, characterized in that: The energy storage device also includes a cover plate (110), the box body (100) is provided with an inlet and outlet, the inlet and outlet are connected to the accommodating cavity (100A), the cover plate (110) is covered on the inlet and outlet, and the cover plate (110) is connected to the box body (100) by fasteners.

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

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

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

10. A method for manufacturing an energy storage device, applicable to the energy storage device according to any one of claims 1-9, characterized in that, The method includes: Multiple battery cells (200) are arranged in the receiving cavity (100A) of the housing (100), and porous support members (300) are provided between the battery cells (200). The manufacturing method of the porous support (300) includes: The fiber bundles (320) are placed in the mold in the same direction or intersecting directions; Under the conditions of pressing temperature and pressing pressure, the fiber bundles (320) are initially pressed, so that the fiber bundles (320) come into contact with each other and partially combine in the mold; The pre-pressed fiber bundles (320) are impregnated in curing agent (330) to ensure that the curing agent (330) penetrates evenly into the pores between the fiber bundles (320); Under the curing temperature, the fiber bundles (320) are cured, so that the curing agent (330) between the fiber bundles (320) hardens; The impregnated and cured porous support (300) is subjected to secondary pressing; The porous support (300) after secondary pressing is sintered; The porous support (300) is surface treated, said surface treatment being polishing, coating or heat treatment.

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