Energy storage device and energy storage system

Abstract

The embodiment of the utility model provides an energy storage device and an energy storage system. The energy storage device comprises a box body, a supporting piece and a battery monomer assembly, the supporting piece is connected to the box body, the supporting piece comprises a supporting base body, the supporting base body comprises a multi-axial fabric and a first adhesive, and fibers in the multi-axial fabric extend in multiple directions. The battery cell assembly includes battery cells, and the battery cell assembly is supported on the support base. According to the energy storage device provided by the embodiment of the invention, the insulation performance of the supporting piece and the battery monomer assembly can be improved, and the risk that the supporting piece is damaged due to corrosion can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and more particularly, to an energy storage device and an energy storage system. Background Art

[0002] With the rapid development of technology, electric energy has become an indispensable energy source in people's production and life. In order to improve the smoothness of electric energy supply and ensure the normal operation of production and life, energy storage devices are required. As a device for storing electric energy, through charging or discharging of the energy storage device, electric energy can be stored in the energy storage device or the electric energy stored in the energy storage device can be supplied to the electrical device. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation, and energy storage power stations and other fields.

[0003] In the development of energy storage devices, how to improve the reliable performance of energy storage devices is an issue that cannot be ignored. Therefore, how to improve the reliable performance of energy storage devices is a technical problem that continues to be improved in energy storage technology. Utility Model Content

[0004] The present application provides an energy storage device and an energy storage system to improve the reliable performance of the energy storage device.

[0005] The present application is implemented through the following technical solutions:

[0006] In a first aspect, the energy storage device provided by an embodiment of the present application includes a box body, a support member, and a battery cell assembly. The support member is connected to the box body. The support member includes a support base body, and the support base body includes a multi-axial fabric and a first adhesive. The extension directions of the fibers in the multi-axial fabric are various. The battery cell assembly includes battery cells, and the battery cell assembly is supported on the support base body.

[0007] According to the energy storage device provided by the embodiment of the present application, by setting the support base body of the support member to include a multi-axial fabric and a first adhesive, the support member has a high structural strength, and the support base body has good insulation performance and good anti-corrosion performance. Thus, it is beneficial to improve the insulation performance between the support member and the battery cell assembly, and it is beneficial to reduce the risk of damage to the support member due to corrosion, which is beneficial to improving the reliable performance of the energy storage device.

[0008] According to some embodiments of the present application, the support base body includes multiple layers of multi-axial fabrics stacked.

[0009] In the above solution, it is beneficial to further improve the structural strength of the support member, and thus improve the support ability of the support member for the battery cell assembly.

[0010] According to some embodiments of the present application, the multi-axial fabric includes a tri-axial fabric, and the extension directions of the fibers in the tri-axial fabric are three.

[0011] In the above solution, while simplifying the structure of the multi-axial fabric, it is also beneficial to improve the structural strength of the support member.

[0012] According to some embodiments of the present application, the support member further includes a reinforcing portion, and the support substrate is disposed on the surface of the reinforcing portion.

[0013] In the above solution, it is beneficial to further improve the structural strength of the support member.

[0014] According to some embodiments of the present application, the reinforcing portion includes a metal plate, and the support substrate is coated on the surface of the metal plate.

[0015] In the above solution, setting the reinforcing portion to include a metal plate is beneficial to further improve the structural strength of the support member, and thus improve the supporting ability of the support member for the battery cell assembly.

[0016] According to some embodiments of the present application, the reinforcing portion includes unidirectional fibers and a second adhesive, and the extending direction of the fibers in the multi-axial fabric intersects with the extending direction of the unidirectional fibers.

[0017] In the above solution, it is beneficial to reduce the weight of the support member and further improve the structural strength of the support member. Especially in the direction perpendicular to the extending direction of the unidirectional fibers, the support member has strong structural strength.

[0018] According to some embodiments of the present application, the support member is arranged to extend a preset distance in the first direction, and the unidirectional fibers extend in the first direction.

[0019] In the above solution, it is beneficial to improve the structural strength of the support member in the direction intersecting with the first direction, and beneficial to improve the load-bearing capacity of the support member, and thus beneficial to improve the structural reliability of the support member.

[0020] According to some embodiments of the present application, there are three extending directions of the fibers in the multi-axial fabric. The angles from the extending direction of the unidirectional fibers in the counterclockwise direction to the fibers in the three extending directions in the multi-axial fabric are α, β, and γ respectively, where 30° ≤ α ≤ 45°, 80° ≤ β ≤ 100°, and 135° ≤ γ ≤ 150°.

[0021] In the above solution, the fibers in the multi-axial fabric intersect with the unidirectional fibers, and the extending directions of the three fibers in the multi-axial fabric are relatively evenly distributed along the circumferential direction, so that the support member formed by processes such as pultrusion has stronger structural strength. Especially in the direction perpendicular to the unidirectional fibers and the tri-axial fabric, it has stronger mechanical properties, which is beneficial to further improve the structural strength of the support member.

[0022] According to some embodiments of the present application, the relationship between the thickness d1 of the supporting substrate and the thickness d of the wall portion of the corresponding support member satisfies: 3 / 40 ≤ d1 / d ≤ 9 / 20.

[0023] In the above solution, setting 3 / 40 ≤ d1 / d ≤ 9 / 20 is beneficial to further improve the structural strength of the support member.

[0024] According to some embodiments of the present application, the support member has a groove, and the groove has an opening on the side facing the battery cell assembly. The battery cell assembly further includes a frame, the battery cell is accommodated in the frame, and a part of the frame is supported in the groove.

[0025] In the above solution, by providing that the support member has a groove facing the battery cell assembly and providing that a part of the frame of the battery cell assembly is supported in the groove, it is beneficial to improve the support reliability of the support member for the battery cell assembly.

[0026] According to some embodiments of the present application, the energy storage device further includes a limiting member, the limiting member is arranged in the groove, the frame has a stopping portion, and the stopping portion cooperates with the limiting member to limit the displacement of the frame.

[0027] In the above solution, by providing the limiting member and providing that the limiting member cooperates with the stopping portion of the frame to limit the displacement of the frame, it is beneficial to reduce the risk of unnecessary movement of the battery cell assembly relative to the support member and is beneficial to improving the stability of the battery cell assembly.

[0028] According to some embodiments of the present application, the support member has a cavity, and the cavity is arranged below the groove along the direction of gravity.

[0029] In the above solution, the cavity can provide a certain buffering effect for the battery cell assembly under the action of loads such as vibration and impact on the battery cell assembly, which is beneficial to improving the impact resistance performance of the battery cell assembly and further improving the reliable performance of the battery cell assembly.

[0030] According to some embodiments of the present application, the support member has a first wall, a second wall and a third wall, the first wall, the second wall and the third wall surround the periphery of the cavity, and any one of the first wall, the second wall and the third wall is connected to the other two. Along the direction perpendicular to the extension direction of the support member, the cross-sections of the first wall, the second wall and the third wall are triangular.

[0031] In the above solution, the triangular structure is more stable. Therefore, setting the cross-sections of the first wall, the second wall and the third wall to be triangular along the direction perpendicular to the extension direction of the support member is beneficial to improving the structural stability of the support member, and further beneficial to improving the bearing capacity of the support member for the battery cell assembly.

[0032] According to some embodiments of the present application, the first wall faces the box body and has a mounting hole. The second wall faces the groove, and the third wall is inclined relative to the first wall and the second wall. The third wall has an avoidance opening, and the avoidance opening is disposed opposite to the mounting hole. The energy storage device further includes a connecting member, and the connecting member can pass through the mounting hole via the avoidance opening and connect the box body and the support member.

[0033] In the above solution, the avoidance opening is disposed opposite to the mounting hole, providing a certain space for the connecting member during the process of connecting the support member and the box body, which is beneficial to improving the convenience of connecting the support member and the box body.

[0034] In a second aspect, the energy storage system provided by the embodiments of the present application includes the energy storage device provided by any of the above embodiments.

[0035] The energy storage system provided by the embodiments of the present application has the same technical effects due to adopting the energy storage device provided by any of the above embodiments, and will not be elaborated herein.

[0036] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 It is a schematic structural diagram of the energy storage system provided by the embodiments of the present application;

[0039] Figure 2 It is a schematic structural diagram of the energy storage device provided by the embodiments of the present application;

[0040] Figure 3 It is a schematic structural diagram of the battery cell assembly in the energy storage device provided by the embodiments of the present application;

[0041] Figure 4 It is an exploded structural diagram of the battery cell in the battery cell assembly of the energy storage device provided by the embodiments of the present application;

[0042] Figure 5 It is a cross-sectional structural diagram of a support member in the energy storage device provided by the embodiments of the present application;

[0043] Figure 6 It is a cross-sectional structural diagram of another support member in the energy storage device provided by the embodiments of the present application;

[0044] Figure 7 This is the front view of the support member in the energy storage device provided by the embodiment of the present application;

[0045] Figure 8 is Figure 2 the enlarged partial view at position A in

[0046] Figure 9 This is the structural schematic diagram of the support member in the energy storage device provided by the embodiment of the present application;

[0047] Figure 10 This is the structural schematic diagram of another energy storage device provided by the embodiment of the present application.

[0048] In the drawings, the drawings are not necessarily drawn to scale.

[0049] Explanation of reference numerals:

[0050] 1 - Energy storage system;

[0051] 10 - Energy storage device; 11 - Box body; 12 - Support member; 12a - Groove; 12b - Cavity; 121 - Support base; 122 - Reinforcing portion; 123 - First wall; 123a - Mounting hole; 124 - Second wall; 125 - Third wall; 125a - Avoidance opening;

[0052] 20 - Battery cell assembly; 21 - Frame; 211 - Stopping portion;

[0053] 30 - Battery cell; 31 - Outer shell; 311 - Housing; 312 - End cover; 32 - Electrode assembly;

[0054] 40 - Limiting member;

[0055] 50 - Connecting member;

[0056] X - First direction. Detailed implementation manners

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0059] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0062] The term "plurality" as used in this application means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0063] In some embodiments, the battery cell assembly can be a battery pack. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery pack.

[0064] In some embodiments, the battery cell assembly can be a battery module, and the battery module includes a box body and battery cells, and the battery cells or the battery pack are accommodated in the box body.

[0065] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0066] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through.

[0067] Optionally, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The types of electrolytes in this application are not specifically limited and can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0068] Optionally, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0069] Optionally, the electrode assembly is a laminated structure.

[0070] Optionally, the shape of the electrode assembly can be cylindrical, flat, or multi-prismatic, etc.

[0071] An energy storage device generally includes a battery cell assembly, a support member, and a box body. The support member is connected to the box body and is used to support the battery cell assembly. Therefore, the support member needs to have strong load-bearing capacity. In the related art, the support member is usually formed by stamping a metal sheet metal part and a corrosion-resistant insulating layer is sprayed on its surface. However, during the cooperation between the battery cell assembly and the support member, the support member will inevitably be bumped to a certain extent, thereby causing damage to the corrosion-resistant insulating layer. During the long-term use of the energy storage device, the metal interface between the corrosion-resistant insulating layer and the sheet metal part may be peeled off. In this way, it is easy to cause the corrosion protection failure of the support member and the insulation failure between the support member and the battery cell assembly, thereby affecting the reliable performance of the energy storage device.

[0072] In view of this, an embodiment of this application provides an energy storage device, which includes a box body, a support member, and a battery cell assembly. The support member is connected to the box body. The support member includes a support matrix, and the support matrix includes a multi-axial fabric and a first adhesive. The fiber extension directions in the multi-axial fabric are various. The battery cell assembly includes battery cells, and the battery cell assembly is supported on the support matrix.

[0073] According to the energy storage device provided by the embodiment of this application, by setting the support matrix of the support member to include a multi-axial fabric and a first adhesive, the support member has high structural strength, and the support matrix has good insulation performance and good corrosion protection performance. In this way, it is beneficial to improve the insulation performance between the support member and the battery cell assembly, and is beneficial to reducing the risk of damage to the support member due to corrosion, and is beneficial to improving the reliable performance of the energy storage device.

[0074] The technical solution provided by the embodiments of the present application is applicable to energy storage devices and energy storage systems using the energy storage devices.

[0075] The energy storage system can be an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage power station can store electric energy during the low electricity consumption period and supply electric energy to relevant users or electrical equipment during the high electricity consumption period. After the wind energy collected by the wind turbine of the wind power generation system is converted into electric energy, it is stored by the energy storage device. The solar power generation system can convert solar energy into electric energy and store it by the energy storage device, and supply it to users in a timely manner. The mobile power system can supply power to relevant electrical equipment in places where the grid power supply system cannot reach, such as remote mountainous areas, remote wild areas, etc. The temporary power supply system can supply power to users in the case of insufficient power supply. The energy storage system provided by the embodiments of the present application can be any power system that requires the use of energy storage devices.

[0076] Please refer to Figure 4 , Figure 4 which is a schematic explosion structure diagram of the battery cell 30 in the energy storage device provided by the embodiments of the present application. As Figure 4 shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals. The housing 31 includes a housing body 311 and an end cap 312. The housing body 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0077] The housing body 311 is a component for cooperating with the end cap 312 to form the internal environment of the battery cell 30. Among them, the formed internal environment can be used to accommodate the electrode assembly 32, electrolyte, and other components. The housing body 311 and the end cap 312 can be independent components. The housing body 311 can be of various shapes and sizes. Specifically, the shape of the housing body 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the housing body 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0078] The end cap 312 is a component that covers the opening of the housing body 311 to isolate the internal environment of the battery cell 30 from the external environment.

[0079] In a first aspect, as Figures 2 to 5 and Figure 10 shown, the energy storage device 10 provided by the embodiments of the present application includes a box body 11, a support member 12, and a battery cell assembly 20. The support member 12 is connected to the box body 11. The support member 12 includes a support base 121. The support base 121 includes a multi-axial fabric and a first adhesive. The extending directions of the fibers in the multi-axial fabric are various. The battery cell assembly 20 includes battery cells 30. The battery cell assembly 20 is supported on the support base 121.

[0080] The energy storage device 10 may include a plurality of support members 12 and a plurality of battery cell assemblies 20. The plurality of battery cell assemblies 20 may be arranged at intervals along one direction. Both sides of the battery cell assembly 20 may be respectively supported by the support members 12, so as to provide a certain supporting force for the battery cell assembly 20 through the support members 12.

[0081] The battery cell assembly 20 includes battery cells 30. Optionally, the battery cell assembly 20 may include a plurality of battery cells 30, and the plurality of battery cells 30 are arranged along one or more directions. The battery cell assembly 20 may further include a frame 21, the battery cells 30 are received in the frame 21, and the battery cell assembly 20 may be supported on the support members 12 through the frame 21.

[0082] The support members 12 may be made of an insulating material. The support member 12 includes a support matrix 121. Optionally, the support member 12 may only include the support matrix 121, or the support member 12 may also include other structures, which can be selected according to needs.

[0083] The support matrix 121 includes a multi-axial fabric and a first adhesive. The multi-axial fabric may be woven from fibers with multiple different extending directions. Optionally, the extending directions of the fibers in the multi-axial fabric may be two, three or more. The first adhesive may be a resin or a polyester, etc.

[0084] The multi-axial fabric and the first adhesive may be formed by a pultrusion process. Specifically, first, the multi-axial fabric is impregnated with a first adhesive such as resin, and then the multi-axial fabric and the first adhesive are integrally cured and formed. In this way, the support matrix 121 has good insulation performance.

[0085] The gram weight of the multi-axial fabric may be 450 g / m 2 , and the volume content of the multi-axial fabric in the support matrix 121 may be 50% - 65%. Exemplarily, the volume content of the multi-axial fabric in the support matrix 121 may be 56%.

[0086] The multi-axial fabric may be a multi-axial cloth, and the support matrix 121 may include one layer, two layers, three layers or more layers of multi-axial cloth. The support matrix 121 may be in the shape of a thin wall or a block, etc.

[0087] Since the support matrix 121 includes a multi-axial fabric and a first adhesive, the support member 12 has good insulation performance. And compared with a sheet metal part made of a metal material, the multi-axial fabric and the first adhesive have good insulation performance and corrosion resistance, and the formed support matrix 121 has excellent insulation performance and strong structural strength, so that the support member 12 has good insulation performance with the battery cell assembly 20 and provides a good supporting effect for the battery cell assembly 20.

[0088] The energy storage device 10 provided by the embodiment of the present application has a support base 121 of the support member 12 including a multi-axial fabric and a first adhesive, so that the support member 12 has high structural strength, and the support base 121 has good insulation performance and good anti-corrosion performance. Thus, it is beneficial to improve the insulation performance between the support member 12 and the battery cell assembly 20, and is beneficial to reduce the risk of damage to the support member 12 due to corrosion, which is beneficial to improving the reliability of the energy storage device 10.

[0089] In some embodiments, the support base 121 includes multiple layers of multi-axial fabrics stacked.

[0090] Optionally, the angles of the fibers in different layers of multi-axial fabrics can be exactly the same, partially the same, or completely different, and can be selected according to actual needs.

[0091] Thus, it is beneficial to further improve the structural strength of the support member 12, and further improve the supporting ability of the support member 12 for the battery cell assembly 20.

[0092] In some embodiments, the multi-axial fabric includes a tri-axial fabric, and there are three fiber extension directions in the tri-axial fabric.

[0093] The fibers in the tri-axial fabric have three extension directions. In other words, the fibers in the tri-axial fabric extend along three pairwise intersecting directions. Thus, while simplifying the structure of the multi-axial fabric, it is also beneficial to improve the structural strength of the support member 12.

[0094] In some embodiments, as Figure 6 shown, the support member 12 further includes a reinforcing portion 122, and the support base 121 is disposed on the surface of the reinforcing portion 122.

[0095] Optionally, the reinforcing portion 122 can be pre-formed, and then the insulating portion 121 is formed on the reinforcing portion 122.

[0096] The reinforcing portion 122 can be a sheet metal part, or the reinforcing portion 122 can be a plastic part or other structures.

[0097] By providing the reinforcing portion 122 and disposing the support base 121 on the surface of the reinforcing portion 122, it is beneficial to improve the insulation performance between the support member 12 and the battery cell assembly 20 while also being beneficial to improving the structural strength of the support member 12.

[0098] In some embodiments, the reinforcing portion 122 includes a metal plate, and the insulating portion 121 covers the outer surface of the metal plate.

[0099] Optionally, the metal plate can be a steel plate or an aluminum plate, etc.

[0100] The reinforcing portion 122 is provided with a metal plate, which is beneficial to further improve the structural strength of the support member 12, and thus improve the supporting ability of the support member 12 for the battery cell assembly 20.

[0101] In some embodiments, the reinforcing portion 122 includes unidirectional fibers and a second adhesive, and the extending direction of the fibers in the multi-axial fabric intersects with the extending direction of the unidirectional fibers.

[0102] The reinforcing portion 122 includes unidirectional fibers and a first adhesive. Optionally, the unidirectional fibers may be unidirectional yarns, and the second adhesive may be resin or polyester, etc. The first adhesive and the unidirectional fibers can also be formed by a pultrusion process. Specifically, first, the unidirectional fibers are infiltrated with a second adhesive such as resin, and then the unidirectional fibers and the second adhesive are integrally cured to form the reinforcing portion 122. Optionally, the types of the second adhesive and the first adhesive may be the same or different.

[0103] The gram weight of the unidirectional fibers can be 2400 TEX, etc. The volume content of the unidirectional fibers in the reinforcing portion 122 can be 60% - 80%. Exemplarily, the volume content of the unidirectional fibers in the reinforcing portion 122 can be 65%.

[0104] The support matrix 121 is disposed on the surface of the reinforcing portion 122. Optionally, the support matrix 121 can be disposed on the outer surface of the reinforcing portion 122, or the reinforcing portion 122 has a cavity 12b, and the support matrix 121 can be disposed on the inner surface of the reinforcing portion 122 facing the cavity 12b. Of course, the support matrix 121 can also be disposed on both the inner surface and the outer surface of the reinforcing portion 122.

[0105] The extending direction of the fibers in the multi-axial fabric intersects with the extending direction of the unidirectional fibers, so that the fibers in each extending direction in the multi-axial fabric intersect with the extending direction of the unidirectional fibers. In other words, each fiber in the multi-axial fabric intersects with the unidirectional fibers, and the extending direction of the unidirectional fibers can be the same as the extending direction of the support member 12. After the support matrix 121 and the reinforcing portion 122 are respectively processed by the pultrusion process, since the extending direction of the uniaxial fibers intersects with the extending direction of the fibers in the multi-axial fabric, the formed support member 12 has a high structural strength, especially in the direction perpendicular to the unidirectional fibers and the multi-axial fabric.

[0106] Therefore, with such a setting, it is beneficial to further improve the structural strength of the support member 12. Especially in the direction perpendicular to the extending direction of the unidirectional fibers, the support member 12 has strong structural strength.

[0107] In some embodiments, as Figure 9 shown, the support member 12 is arranged to extend a preset distance along the first direction X, and the unidirectional fibers extend along the first direction X.

[0108] The support member 12 can be strip-shaped and extend along the first direction X. The mating surface of the support member 12 and the battery cell assembly 20 can also extend along the first direction X to increase the mating area between the support member 12 and the battery cell assembly 20, thereby facilitating the improvement of the support strength of the support member 12 for the battery cell assembly 20.

[0109] The distance that the support member 12 extends along the first direction X can be set according to actual needs. The unidirectional fibers extend along the first direction X, so the extension direction of the unidirectional fibers is the same as that of the support member 12.

[0110] In the energy storage device 10, after the battery cell assembly 20 is mated with the support member 12, the direction of the force exerted by the battery cell assembly 20 on the support member 12 mostly intersects with the extension direction of the support member 12. By setting the unidirectional fibers to extend along the first direction X, the reinforcing portion 122 has a relatively high structural strength in the direction intersecting with the first direction X. Especially in the direction perpendicular to the first direction X, the reinforcing portion 122 has a relatively high structural strength. Thus, it is beneficial to improve the structural strength of the support member 12 in the direction intersecting with the first direction X, and it is beneficial to improve the load-bearing capacity of the support member 12, and further beneficial to improve the structural reliability of the support member 12.

[0111] In some embodiments, there are three fiber extension directions in the multi-axial fabric. The angles from the extension direction of the unidirectional fibers in the counterclockwise direction to the fibers with the three extension directions in the multi-axial fabric are α, β, and γ respectively, where 30° ≤ α ≤ 45°, 80° ≤ β ≤ 100°, and 135° ≤ γ ≤ 150°.

[0112] For the angles α, β, and γ from the extension direction of the unidirectional fibers in the counterclockwise direction to the fiber extension directions in the tri-axial fabric, the unidirectional fibers need to rotate by angles α, β, and γ respectively in the counterclockwise direction before they can coincide or be parallel to the three types of fibers in the multi-axial fabric.

[0113] Optionally, α can be 30°, 35°, 40°, or 45°, etc., β can be 80°, 85°, 90°, 95°, or 100°, etc., and γ can be 135°, 140°, 145°, or 150°, etc.

[0114] In this way, the extension directions of the fibers in the multi-axial fabric all intersect with the extension direction of the unidirectional fibers, and the fibers with the three extension directions in the multi-axial fabric are distributed as evenly as possible in the circumferential direction. Exemplarily, α is 45°, β is 90°, and γ is 145°. In this way, for the three fibers and the unidirectional fiber in the multi-axial fabric, the included angle between any two adjacent ones of the four fiber extension directions is 45°.

[0115] With such a setting, the fibers in the multi-axial fabric intersect with the unidirectional fibers, and the extension directions of the three fibers in the multi-axial fabric are relatively evenly distributed along the circumferential direction, so that the support member 12 formed by processes such as pultrusion has stronger structural strength. Especially in the direction perpendicular to the unidirectional fibers and the tri-axial fabric, it has stronger mechanical properties, which is beneficial to further improving the structural strength of the support member 12.

[0116] In some embodiments, as Figure 6 shown, the relationship between the thickness d1 of the support matrix 121 and the thickness d of the wall portion of the corresponding support member 12 satisfies: 3 / 40 ≤ d1 / d ≤ 9 / 20.

[0117] It can be understood that the thickness d of the support member 12 at different positions and the corresponding thickness d1 of the support matrix 121 are not the same, and the corresponding values of d1 / d are also not the same. By setting 3 / 40 ≤ d1 / d ≤ 9 / 20, the d1 / d corresponding to any part of the support member 12 satisfies the above relationship.

[0118] Optionally, d1 / d can be 3 / 40, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 or 9 / 20, etc.

[0119] Through systematic analysis and long-term practice, the inventor found that setting 3 / 40 ≤ d1 / d ≤ 9 / 20 is beneficial to further improving the structural strength of the support member 12.

[0120] In some embodiments, as Figure 2 、 Figure 7 and Figure 8 shown, the support member 12 has a groove 12a, and the groove 12a has an opening on the side facing the battery cell assembly 20. The battery cell assembly 20 further includes a frame 21, the battery cell 30 is accommodated in the frame 21, and a part of the frame 21 is supported in the groove 12a.

[0121] The groove 12a has an opening on the side facing the battery cell assembly 20. The groove 12a can be formed during the molding process of the support member 12. The groove 12a can reduce the weight of the support member 12, and thus reduce the weight of the energy storage device 10.

[0122] Since the groove 12a is provided on the side facing the battery cell assembly 20, a part of the frame 21 of the battery cell assembly 20 can be located in the groove 12a, so that the support member 12 can better provide a supporting effect for the battery cell assembly 20.

[0123] Part of the frame 21 is supported within the groove 12a. Optionally, part of the frame 21 can simply be placed within the groove 12a, or the frame 21 can further be connected to the support member 12 within the groove 12a.

[0124] By providing the support member 12 with a groove 12a facing the battery cell assembly 20 and arranging a part of the frame 21 of the battery cell assembly 20 to be supported within the groove 12a, it is beneficial to improve the support reliability of the support member 12 for the battery cell assembly 20.

[0125] In some embodiments, such as Figure 2 and Figure 8 As shown, the energy storage device 10 further includes a limiting member 40. The limiting member 40 is arranged within the groove 12a. The frame 21 has a stop portion 211, and the stop portion 211 cooperates with the limiting member 40 to limit the displacement of the frame 21.

[0126] The limiting member 40 is located within the groove 12a. The limiting member 40 can be connected to the support member 12 within the groove 12a by means such as threaded connection, riveting, or snap connection. The frame 21 has a stop portion 211, and the stop portion 211 cooperates with the limiting member 40. Optionally, the stop portion 211 and the limiting member 40 can be connected by means such as snap connection, threaded connection, or riveting, so as to limit the displacement of the frame 21 relative to the groove 12a through the cooperation of the limiting member 40 and the stop portion 211.

[0127] Optionally, the cooperation between the limiting member 40 and the stop portion 211 can be to limit the displacement of the frame 21 relative to the groove 12a in the direction towards the opening of the groove 12a, or the limiting member 40 can limit the displacement of the frame 21 along the extending direction of the support member 12. Of course, different cooperations between the limiting member 40 and the stop portion 211 can also be set to respectively limit the displacement of the frame 21 relative to the groove 12a in the direction towards the opening of the groove 12a and the displacement of the frame 21 along the extending direction of the support member 12.

[0128] In the embodiments of the present application, by providing the limiting member 40 and arranging the limiting member 40 to cooperate with the stop portion 211 of the frame 21 to limit the displacement of the frame 21, it is beneficial to reduce the risk of unnecessary movement of the battery cell assembly 20 relative to the support member 12 and is beneficial to improving the stability of the battery cell assembly 20.

[0129] In some embodiments, such as Figure 7 As shown, the support member 12 has a cavity 12b, and the cavity 12b is arranged below the groove 12a along the direction of gravity.

[0130] Since the support member 12 includes a support base 121, and the support base 121 includes a first adhesive and a multi-axial fabric, the support member 12 has a certain elasticity. By providing that the support member 12 has a cavity 12b and the cavity 12b is located below the groove 12a in the direction of gravity, when the energy storage device 10 is subjected to loads such as vibration or impact, the frame 21 of the battery cell assembly 20 generates a force on the support member 12 within the groove 12a. Since the support member 12 has a cavity 12b, when the support member 12 is subjected to the force of the frame 21, it can buffer the impact force of the battery cell assembly 20 on the support member 12 by deforming towards the cavity 12b.

[0131] Therefore, the cavity 12b can provide a certain buffering effect for the battery cell assembly 20 when the battery cell assembly 20 is subjected to loads such as vibration and impact, which is beneficial to improving the impact resistance of the battery cell assembly 20 and further improving the reliability of the battery cell assembly 20.

[0132] In some embodiments, as Figure 7 and Figure 8 shown, the support member 12 has a first wall 123, a second wall 124 and a third wall 125. The first wall 123, the second wall 124 and the third wall 125 surround the periphery of the cavity 12b, and any one of the first wall 123, the second wall 124 and the third wall 125 is connected to the other two. Along the direction perpendicular to the extension direction of the support member 12, the cross-sections of the first wall 123, the second wall 124 and the third wall 125 are triangular.

[0133] The extension direction of the support member 12 may be the first direction X, and the outer contour of the cross-sections of the first wall 123, the second wall 124 and the third wall 125 perpendicular to the first direction X is generally triangular.

[0134] It should be noted that the "triangle" here is not a triangle in the strict sense, and there may be chamfers at the three corners of the above cross-sections.

[0135] The first wall 123, the second wall 124 and the third wall 125 surround the periphery of the cavity 12b, then the first wall 123, the second wall 124 and the third wall 125 may extend along the extension direction of the support member 12 respectively, and the first wall 123, the second wall 124 and the third wall 125 are located below the groove 12a in the direction of gravity to provide a supporting effect on the battery cell assembly 20.

[0136] If any one of the first wall 123, the second wall 124, and the third wall 125 is connected to the other two, then along the circumferential side of the cavity 12b, the first wall 123, the second wall 124, and the third wall 125 are connected end to end in sequence, so that the cross-section of the first wall 123, the second wall 124, and the third wall 125 perpendicular to the extension direction of the support member 12 is triangular, and the cross-section of the cavity 12b perpendicular to the extension direction of the support member 12 can also be triangular.

[0137] It can be understood that the triangular structure is more stable. Therefore, setting the cross-section of the first wall 123, the second wall 124, and the third wall 125 perpendicular to the extension direction of the support member 12 to be triangular is beneficial to improving the structural stability of the support member 12, and further beneficial to improving the bearing capacity of the support member 12 for the battery cell assembly 20.

[0138] In some embodiments, as Figure 7 , Figure 8 and Figure 9 shown, the first wall 123 faces the box body 11 and has a mounting hole 123a, the second wall 124 faces the groove 12a, the third wall 125 is inclined relative to the first wall 123 and the second wall 124, the third wall 125 has an avoidance opening 125a, and the avoidance opening 125a is disposed opposite to the mounting hole 123a. The energy storage device 10 further includes a connecting member 50, and the connecting member 50 can pass through the mounting hole 123a via the avoidance opening 125a and connect the box body 11 and the support member 12.

[0139] The first wall 123 faces the box body 11, so the support member 12 can be connected to the box body 11 through the first wall 123. The second wall 124 faces the groove 12a, and the second wall 124 can be connected to the frame 21 of the battery cell assembly 20. The third wall 125 connects the first wall 123 and the second wall 124 and is inclined relative to the first wall 123 and the second wall 124. Then, during the process of connecting the support member 12 and the box body 11 using the connecting member 50, the connecting member 50 can pass through the avoidance opening 125a of the third wall 125 and the mounting hole 123a and the box body 11 to connect the support member 12 and the box body 11 through the connecting member 50.

[0140] In addition, during the process of connecting the support member 12 and the box body 11 using the connecting member 50, the avoidance opening 125a can provide a certain operating space for their connection, which is beneficial to improving the connection convenience between the support member 12 and the box body 11.

[0141] Therefore, setting the avoidance opening 125a to be disposed opposite to the mounting hole 123a provides a certain space for the connecting member 50 during the process of connecting the support member 12 and the box body 11, which is beneficial to improving the connection convenience between the support member 12 and the box body 11.

[0142] Second aspect, as Figure 1 shown, the energy storage system 1 provided by the embodiment of the present application includes the energy storage device 10 provided by any of the above embodiments.

[0143] The energy storage system 1 provided by the embodiment of the present application has the same technical effects because it adopts the energy storage device 10 provided by any of the above embodiments, which will not be elaborated here.

[0144] In some embodiments, as Figures 2 to 10 shown, the energy storage device 10 includes a box body 11, a support member 12, a limiting member 40, and a battery cell assembly 20. The support member 12 is connected to the box body 11. The support member 12 includes a support base 121 and a reinforcing portion 122. The support base 121 is disposed on the surface of the reinforcing portion 122. The support base 121 includes a triaxial fabric and a first adhesive. The reinforcing portion 122 includes a unidirectional fiber and a second adhesive. The support member 12 is disposed to extend a preset distance along a first direction X, and the unidirectional fiber extends along the first direction X. The fiber in the triaxial fabric has three extension directions, and the extension direction of the fiber in the triaxial fabric intersects with the extension direction of the unidirectional fiber. Along the counterclockwise direction, the angles between the extension direction of the unidirectional fiber and the three extension directions of the fiber in the triaxial fabric are α, β, and γ respectively, 30°≤α≤45°, 80°≤β≤100°, 135°≤γ≤150°.

[0145] The relationship between the thickness d1 of the support base 121 of the support member 12 and the thickness d of the wall portion of the corresponding support member 12 satisfies: 3 / 40 ≤ d1 / d ≤ 9 / 20. The support member 12 has a groove 12a and a cavity 12b. The groove 12a has an opening facing the side of the battery cell assembly 20, and the cavity 12b is provided below the groove 12a along the direction of gravity. The limiting member 40 is provided in the groove 12a. The battery cell assembly 20 includes a battery cell 30 and a frame 21. The battery cell 30 is accommodated in the frame 21, and a part of the frame 21 is supported in the groove 12a. The frame 21 has a stop portion 211, and the stop portion 211 cooperates with the limiting member 40 to limit the displacement of the frame 21. The support member 12 has a first wall 123, a second wall 124, and a third wall 125. The first wall 123, the second wall 124, and the third wall 125 surround the periphery of the cavity 12b, and any one of the first wall 123, the second wall 124, and the third wall 125 is connected to the other two. Along the direction perpendicular to the extension direction of the support member 12, the cross-sections of the first wall 123, the second wall 124, and the third wall 125 are triangular. The first wall 123 faces the box body 11 and has a mounting hole 123a. The second wall 124 faces the groove 12a. The third wall 125 is inclined with respect to the first wall 123 and the second wall 124, and the third wall 125 has an avoidance opening 125a, and the avoidance opening 125a is disposed opposite to the mounting hole 123a. The energy storage device 10 further includes a connecting member 50. The connecting member 50 can pass through the mounting hole 123a via the avoidance opening 125a and connect the box body 11 and the support member 12.

[0146] In the energy storage device 10 provided by the embodiment of the present application, by providing that the support base 121 of the support member 12 includes a multi-axial fabric and a first adhesive, the support member 12 has high structural strength, and the support member 12 has good insulation performance and good anti-corrosion performance. Thus, it is beneficial to improve the insulation performance between the support member 12 and the battery cell assembly 20, and it is beneficial to reduce the risk of damage to the support member 12 due to corrosion, which is beneficial to improving the reliable performance of the energy storage device 10.

[0147] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized in that, Comprising: A box body; A support member, connected to the box body, the support member includes a support base body, the support base body includes a multi-axial fabric and a first adhesive, and there are multiple extending directions of fibers in the multi-axial fabric; A battery cell assembly, including a battery cell, and the battery cell assembly is supported on the support base body.

2. The energy storage device according to claim 1, wherein, The support base body includes multiple layers of the multi-axial fabric stacked.

3. The energy storage device according to claim 1, characterized in that, The multi-axial fabric includes a tri-axial fabric, and there are three extending directions of fibers in the tri-axial fabric.

4. The energy storage device according to claim 1, wherein The support member further includes a strengthening portion, and the support base body is disposed on the surface of the strengthening portion.

5. The energy storage device according to claim 4, wherein The strengthening portion includes a metal plate, and the support base body covers the surface of the metal plate.

6. The energy storage device according to claim 4, characterized in that, The strengthening portion includes unidirectional fibers and a second adhesive, and the extending direction of the fibers in the multi-axial fabric intersects with the extending direction of the unidirectional fibers.

7. The energy storage device according to claim 6, characterized in that, The support member extends a preset distance along a first direction, and the unidirectional fibers extend along the first direction.

8. The energy storage device according to claim 6, wherein There are three extending directions of fibers in the multi-axial fabric; In the counterclockwise direction, the angles between the extending direction of the unidirectional fibers and the fibers in the three extending directions in the multi-axial fabric are α, β, and γ respectively, 30° ≤ α ≤ 45°, 80° ≤ β ≤ 100°, 135° ≤ γ ≤ 150°.

9. The energy storage device according to claim 6, wherein The relationship between the thickness d1 of the support base body and the thickness d of the corresponding wall portion of the support member satisfies: 3 / 40 ≤ d1 / d ≤ 9 / 20.

10. The energy storage device according to any one of claims 1 to 9, characterized in that, The support member has a groove, and the groove has an opening on the side facing the battery cell assembly; The battery cell assembly further includes a frame, the battery cell is accommodated in the frame, and a part of the frame is supported in the groove.

11. The energy storage device according to claim 10, wherein, The energy storage device further includes a limiting member, and the limiting member is disposed in the groove; The frame has a stopping portion, and the stopping portion cooperates with the limiting member to limit the displacement of the frame.

12. The energy storage device according to claim 10, characterized in that, The support member has a cavity, and the cavity is disposed below the groove along the direction of gravity.

13. The energy storage device according to claim 12, wherein, The support member has a first wall, a second wall, and a third wall, the first wall, the second wall, and the third wall surround the periphery of the cavity, and any one of the first wall, the second wall, and the third wall is connected to the other two; Along the direction perpendicular to the extending direction of the support member, the cross-sections of the first wall, the second wall, and the third wall are triangular.

14. The energy storage device according to claim 13, wherein The first wall faces the box body and has a mounting hole, the second wall faces the groove, the third wall is inclined relative to the first wall and the second wall, and the third wall has an avoidance opening, and the avoidance opening is disposed opposite to the mounting hole; The energy storage device further includes a connecting member, and the connecting member can pass through the mounting hole via the avoidance opening and connect the box body and the support member.

15. An energy storage system, characterized in that, Including the energy storage device according to any one of claims 1 to 14.

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