A battery device, an energy storage device, an energy storage system, and a charging network

Abstract

The application provides a battery device, an energy storage device, an energy storage system and a charging network. The battery device comprises a plurality of battery monomers, a heat dissipation component and an isolation pad. The heat dissipation component is used for dissipating heat of the plurality of battery monomers. The isolation pad comprises a first isolation part, a second isolation part and a bending part. The bending part connects the first isolation part and the second isolation part. The first isolation part is arranged between two adjacent battery monomers. The second isolation part is arranged between the battery monomer and the heat dissipation component. The first isolation part is used for absorbing heat and transmitting the heat to the heat dissipation component through the bending part and the second isolation part. The thermal conductivity of the bending part is greater than that of the first isolation part and the second isolation part. The battery device, the energy storage device, the energy storage system and the charging network provided by the application can improve the heat dissipation capacity of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of secondary batteries, in particular to a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0002] In recent years, batteries are widely used in energy storage power systems such as hydroelectric, thermal and solar power stations, and in many fields such as electric tools, electric vehicles, aerospace, etc. A large amount of heat is generated during the charging and discharging process of the battery. If the generated heat cannot be dissipated in time, the temperature of the battery will rise, which will affect the performance and life of the battery. Therefore, how to effectively dissipate heat from the battery is a technical problem to be solved. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a battery device, an energy storage device, an energy storage system and a charging network, which can improve the heat dissipation capacity of the battery.

[0004] The first aspect of the present application provides a battery device, comprising a plurality of battery monomers, a heat dissipation component and an isolation pad; the heat dissipation component is used for dissipating heat from the plurality of battery monomers; the isolation pad comprises a first isolation part, a second isolation part and a bending part, the bending part connects the first isolation part and the second isolation part, the first isolation part is arranged between two adjacent battery monomers, and the second isolation part is arranged between the battery monomer and the heat dissipation component; the first isolation part is used for absorbing heat and transferring the heat to the heat dissipation component through the bending part and the second isolation part; the thermal conductivity coefficient of the bending part is greater than that of the first isolation part and the second isolation part.

[0005] In the technical scheme of the present application, the first isolation part is arranged between two adjacent battery monomers, which is conducive to reducing the heat conduction between adjacent battery monomers; the second isolation part is arranged between the battery monomer and the heat dissipation component, which is conducive to transferring the heat absorbed by the first isolation part to the heat dissipation component, and then dissipating heat through the heat dissipation component, thereby improving the heat dissipation capacity of the battery. The bending part connects the first isolation part and the second isolation part to form a whole structure, which is conducive to maintaining the continuity of the heat conduction path. By adjusting the thermal conductivity coefficient of the bending part to be greater than that of the first isolation part and the second isolation part, the heat can be transferred faster in the bending part. After the first isolation part absorbs heat, the heat is rapidly transferred to the second isolation part through the high-thermal-conductivity bending part, and then transferred to the heat dissipation component through the second isolation part. Such design is conducive to optimizing the heat conduction path, reducing the risk of local overheating, and further improving the heat conduction efficiency between the battery monomer and the heat dissipation component, so that the heat generated by the battery monomer during operation can be transferred to the heat dissipation component faster, thereby improving the heat dissipation capacity of the battery.

[0006] In any embodiment, the bending part is provided with a filling part, and the filling part is filled with liquid metal. Since the area of the bending part is limited, the area will limit the transmission of the first isolation part to the second isolation part, and by filling the filling part with liquid metal, the heat dissipation capacity of the bending part can be improved.

[0007] In any embodiment, the liquid metal includes at least one of a bismuth-indium-tin alloy, a gallium-magnesium alloy, and a gallium-indium-tin alloy. The liquid metal in the above range has high thermal conductivity, and when applied to the bending part, the heat dissipation capacity of the bending part can be improved.

[0008] In any embodiment, the volume ratio of the liquid metal to the total volume of the bending part is 30% to 40%. By adjusting the volume ratio of the liquid metal to the above range, the best balance between heat conduction efficiency and structural stability can be achieved. At this ratio, the liquid metal can form a heat conduction network, which is conducive to improving the heat dissipation capacity of the bending part, while having little effect on the mechanical properties of the bending part.

[0009] In any embodiment, the bending part includes a first sub-part and a second sub-part connected to each other, the first sub-part is connected to the first isolation part, the second sub-part is connected to the second isolation part, and an included angle is formed between the first sub-part and the second sub-part; the first sub-part is provided with a first filling groove, and / or the second sub-part is provided with a second filling groove, and the first filling groove and / or the second filling groove is the filling part. The bending part realizes structural transition through the combination of the first sub-part and the second sub-part, and the included angle design can adapt to different installation space requirements. The first filling groove provided on the first sub-part and / or the second filling groove provided on the second sub-part can be filled with liquid metal, thereby improving the heat dissipation capacity of the bending part.

[0010] In any embodiment, the battery device further includes a cover layer, the cover layer is arranged on the surface of the first sub-part and covers the first filling groove, and / or the cover layer is arranged on the surface of the second sub-part and covers the second filling groove. By covering the surface of the first sub-part and / or the surface of the second sub-part with the cover layer, the liquid metal can be sealed in the first filling groove and / or the second filling groove, which is conducive to improving the sealing performance. In addition, the coverage of the first filling groove and / or the second filling groove by the cover layer can also enhance the mechanical strength of the first sub-part and / or the second sub-part, which is conducive to reducing the influence of external impact on the first sub-part and / or the second sub-part.

[0011] In any embodiment, the thermal conductivity of the first isolation portion and the second isolation portion is 0.25 W / (m·K) to 0.35 W / (m·K); and / or the thermal conductivity of the bending portion is 13 W / (m·K) to 16 W / (m·K). By adjusting the thermal conductivity of the first isolation portion and the second isolation portion to the above range, on the one hand, it is conducive to transferring the heat generated by the battery monomer out; on the other hand, it is conducive to reducing the heat conduction between adjacent battery monomers. By adjusting the thermal conductivity of the bending portion to the above range, it is conducive to local rapid heat dissipation, thereby improving the heat dissipation capacity of the bending portion.

[0012] In any embodiment, the isolation pad comprises a main material and a heat-conducting material, the heat-conducting material comprises a metal material and / or a ceramic material, and the main material comprises silica gel and / or aerogel. The isolation pad comprises a main material and a heat-conducting material, the main material can provide a basic heat insulation barrier, and the heat-conducting material improves the heat-conducting effect of the isolation pad. The metal material has excellent thermal conductivity, and its application in the isolation pad can improve the heat-conducting capacity of the isolation pad. The ceramic material has excellent electrical insulation performance, and its application in the isolation pad can maintain the overall electrical insulation performance of the main material while enhancing the heat-conducting capacity of the isolation pad. The silica gel and the aerogel have excellent thermal stability and heat insulation performance, and their application in the isolation pad can delay the spread of heat between adjacent battery monomers to a certain extent when the battery is in thermal runaway.

[0013] In any embodiment, the metal material comprises at least one of copper, aluminum, zinc; and / or, the ceramic material comprises at least one of aluminum oxide, aluminum nitride, boron nitride, silicon carbide; and / or, the volume ratio of the metal material is 5% to 10% based on the total volume of the isolation pad; and / or, the volume ratio of the ceramic material is 0.5% to 3% based on the total volume of the isolation pad; and / or, the volume average particle size DV50 of the metal material is 28 μm to 45 μm; and / or, the volume average particle size DV50 of the ceramic material is 30 nm to 60 nm. The metal material in the above range has excellent thermal conductivity, and its application in the isolation pad can improve the heat conduction capacity of the isolation pad. The ceramic material in the above range has excellent electrical insulation performance, and its application in the isolation pad can maintain the overall electrical insulation performance of the bulk material while enhancing the heat conduction capacity of the isolation pad. When the volume ratio of the metal material is 5% to 10% and / or the volume ratio of the ceramic material is 0.5% to 3% based on the total volume of the isolation pad, on the one hand, it is beneficial to transfer the heat generated by the battery monomer from the high temperature side to the low temperature side, thereby improving the heat dissipation capacity of the battery monomer; on the other hand, the isolation pad can still provide good thermal insulation performance, which is beneficial to reduce the heat conduction between adjacent battery monomers. In addition, when the volume ratio of the metal material and / or the ceramic material is in the above range, the proportion of the bulk material is large, which maintains the self-supporting property of the isolation pad and is beneficial to balance the heat conduction and thermal insulation requirements of the isolation pad. By adjusting the volume average particle size DV50 of the metal material and / or the ceramic material to be in the above range, it is beneficial to form a continuous heat conduction network of the metal material and / or the ceramic material in the bulk material, thereby improving the heat conduction performance of the isolation pad.

[0014] In any embodiment, the isolation pad further comprises a phase change material, and the phase change temperature of the phase change material is 80℃ to 150℃. The phase change material can change phase when the heat is high, and can absorb the heat generated in the battery thermal runaway moment, which is beneficial to delay the heat spread. By selecting the phase change material with a phase change temperature of 80℃ to 150℃, on the one hand, the phase change material will not change phase at the normal working temperature of the battery monomer, which reduces the phase change cycle times of the phase change material and is beneficial to prolong the service life of the phase change material; on the other hand, when the battery monomer occurs thermal runaway and the temperature rises, the phase change material can change phase and absorb the heat generated by the battery in the thermal runaway, which is beneficial to delay the heat spread.

[0015] In any embodiment, the phase change material comprises a waxy material and / or a fatty acid material; and / or, the volume ratio of the phase change material is 7% to 10% based on the total volume of the isolation pad. The waxy material and / or the fatty acid material has excellent latent heat characteristics, and the waxy material and / or the fatty acid material can change phase when the heat is high, thereby absorbing the heat generated in the battery thermal runaway moment, and delaying the heat spread. By adjusting the volume ratio of the phase change material to the above range, the best balance between heat conduction efficiency and structural stability can be achieved. At this ratio, the phase change material can effectively absorb the heat generated by the battery during operation, and delay the temperature rise rate, while its physical form has little effect on the mechanical properties of the isolation pad.

[0016] In any embodiment, the isolation pad and the battery monomer are provided with a heat-conducting groove on one surface close to each other, and a heat-conducting protrusion on the other surface, and the heat-conducting protrusion is arranged in the heat-conducting groove. Through the cooperation of the heat-conducting protrusion and the heat-conducting groove, the contact area between the battery monomer and the isolation pad can be increased, which is conducive to the heat transfer from the battery monomer to the isolation pad.

[0017] In any embodiment, the isolation pad is provided with a positioning groove, and the battery monomer is provided with a positioning protrusion, the positioning groove and the positioning protrusion are connected, and the surface area of the positioning protrusion is greater than the surface area of the heat-conducting protrusion. Through the cooperation of the positioning protrusion and the positioning groove, the precise and rapid positioning of the isolation pad and the battery monomer can be achieved, the assembly efficiency is improved, and the human error is reduced. By adjusting the surface area of the positioning protrusion to be greater than the surface area of the heat-conducting protrusion, the pressure between the positioning protrusion and the positioning groove can be reduced, and the structural reliability and service life of the isolation pad and the battery monomer can be further improved.

[0018] In any embodiment, the battery device further comprises a buffer pad, the buffer pad is arranged between two adjacent battery monomers, and the buffer pad and the isolation pad are arranged alternately along the arrangement direction of the plurality of battery monomers; the buffer pad has a ring structure, and the buffer pad is arranged at the periphery of the battery monomer. When the battery monomer is subjected to thermal expansion or mechanical vibration, the buffer pad can absorb stress by deforming itself, and the ring structure of the buffer pad is conducive to keeping the stress uniform in all directions of the battery monomer. The alternating arrangement of the isolation pad and the buffer pad can meet the needs of heat conduction control and mechanical isolation. The isolation pad is conducive to quickly conducting the heat generated by the battery monomer, and the buffer pad can release mechanical stress by elastic deformation. In addition, this structure design can also adapt to the size tolerance of the battery monomer, and is conducive to the compatibility in the assembly process.

[0019] The second aspect of the present application provides a storage device, which comprises the battery device of the first aspect. In the embodiments of the present application, the storage device has at least the same advantages as the battery device of the first aspect.

[0020] The third aspect of the present application provides a storage system, the storage system comprising the battery device of the first aspect, and / or the storage device of the second aspect. In the embodiments of the present application, the storage system has at least the same advantages as the battery device of the first aspect, and / or the same advantages as the storage device of the second aspect.

[0021] The fourth aspect of the present application provides a charging network, the charging network comprising a charging pile, the battery device of the first aspect, and / or the storage device of the second aspect, and / or the storage system of the third aspect. In the embodiments of the present application, the charging network has at least the same advantages as the battery device of the first aspect, and / or the same advantages as the storage device of the second aspect, and / or the same advantages as the storage system of the third aspect.

[0022] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an exploded structural schematic view of an embodiment of the battery device of the present application.

[0024] Figure 2 is a structural schematic view of the connection of a plurality of battery monomers provided by an embodiment of the present application.

[0025] Figure 3 is Figure 2 is an exploded structural schematic view of the battery monomer, the isolation pad and the buffer pad.

[0026] Figure 4 is a structural schematic view of the isolation pad of an embodiment of the present application.

[0027] Figure 5 is a structural schematic view of the isolation pad of an embodiment of the present application.

[0028] Figure 6 is a structural schematic view of the battery monomer of an embodiment of the present application.

[0029] Figure 7 is a structural schematic view of the buffer pad of an embodiment of the present application.

[0030] Figure 8 is an exploded structural schematic view of an embodiment of the battery monomer of the present application.

[0031] Figure 9 is a structural schematic view of the storage device provided by an embodiment of the present application.

[0032] Figure 10 A structural schematic diagram of an energy storage system according to an embodiment of the present application.

[0033] Figure 11 A structural schematic diagram of a charging network according to an embodiment of the present application.

[0034] Main reference signs:

[0035] 1000 charging network, 2000 energy storage system, 3000 power generation device, 200 energy storage device, 210 energy storage box, 300 charging pile, 400 energy storage converter, 100 battery device, 10 battery box, 11 first part, 12 second part, 20 battery cell, 21 end cover, 22 shell, 23 electrode assembly, 21a electrode terminal, 23a tab, 24 heat-conducting protrusion, 110 isolation pad, 111 first isolation part, 112 second isolation part, 113 bending part, 114 heat-conducting groove, 113a first subpart, 113b second subpart, 120 buffer pad, 130 heat dissipation component, 140 end plate, 150 steel belt. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the battery device, the energy storage device, the energy storage system and the charging network according to the present application are specifically disclosed with appropriate reference to the accompanying drawings. However, there will be cases where unnecessary detailed description is omitted. For example, there will be cases where detailed description of matters known well, repeated description of substantially identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided so that those skilled in the art can fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0037] The ranges disclosed herein are intended to be "open" ranges, i.e., the end values are not included in the range. For example, if a range is listed as 60-120 and 80-110, it is intended that 60-110 and 80-120 are also contemplated. In addition, if a minimum range value of 1 and 2 is listed, and if a maximum range value of 3, 4, and 5 is listed, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise indicated, a numerical range "a-b" means a range of any combination of the numbers a and b, wherein a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between 0 and 5 have been listed herein, and "0-5" is merely a shorthand for listing all of those numbers. Also, when a parameter is stated to be an integer ≥ 2, it is equivalent to state that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0038] All embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, unless otherwise specified.

[0039] All technical features and optional technical features of the present application can be combined with each other to form new technical solutions, unless otherwise specified.

[0040] All steps of the present application can be performed in sequence or randomly, preferably in sequence, unless otherwise specified. For example, a method comprising steps (a) and (b) means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, it is mentioned that the method can further comprise step (c), which means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0041] Unless otherwise specified, "including" and "comprising" mentioned in the present application means open-ended, and can also be closed-ended. For example, "including" and "comprising" can mean that other components not listed can also be included or contained, or only the listed components can be included or contained.

[0042] If not specifically stated, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, any of the following satisfy the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0043] A large amount of heat is generated in the battery cell during charging and discharging. The heat generated by the battery cell is usually removed by water cooling at the bottom. Due to the limited heat exchange area at the bottom of the battery cell, the cooling capacity is limited. If the heat generated by the battery cell cannot be removed in time, the temperature of the battery will rise, and even thermal runaway will occur, and even the thermal runaway of the battery cell adjacent to the battery cell will occur.

[0044] In order to reduce the influence between adjacent battery cells, in the related art, some space is provided between adjacent battery cells in the battery device. The space is generally arranged alternately with isolation pads and buffer pads. The buffer pad provides a buffer space for the volume expansion of the battery cell, and the isolation pad provides a heat insulation effect. However, the heat conduction performance of the isolation pad and the buffer pad is poor, which affects the heat dissipation capacity of the battery. In view of this, the battery device, the energy storage system and the charging network provided by the embodiments of the present application can improve the heat dissipation capacity of the battery.

[0045] The first aspect of the present application provides a battery device.

[0046] Please refer to Figure 1 , Figure 1 is an exploded structural schematic view of an embodiment of the battery device of the present application. The battery device 100 includes a battery box 10 and a battery cell 20, and the battery cell 20 is accommodated in the battery box 10. Among them, the battery box 10 is used to provide an accommodation space for the battery cell 20, and the battery box 10 can adopt various structures. In some embodiments, the battery box 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are covered with each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the accommodation space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the battery box 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0047] In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 20 is accommodated in the battery case 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the battery case 10.

[0048] The battery cells 20 can be lithium ion batteries, lithium-sulfur batteries, sodium ion batteries, or magnesium ion batteries, but are not limited thereto. The battery cells 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0049] Please refer to Figures 2-5 , Figure 2 is a structural schematic diagram of the connection of multiple battery cells provided by the embodiment of the application, Figure 3 is Figure 2 is an exploded structural schematic diagram of the battery cell, the isolation pad, and the buffer pad shown in Figure 4 is a structural schematic diagram of the isolation pad of the embodiment of the application, Figure 5 is a structural schematic diagram of the isolation pad of the embodiment of the application.

[0050] The battery device 100 includes multiple battery cells 20, a heat dissipation component 130, and an isolation pad 110. The heat dissipation component 130 is used for dissipating heat of the multiple battery cells 20. The isolation pad 110 includes a first isolation part 111, a second isolation part 112, and a bending part 113. The bending part 113 connects the first isolation part 111 and the second isolation part 112. The first isolation part 111 is arranged between two adjacent battery cells 20. The second isolation part 112 is arranged between the battery cell 20 and the heat dissipation component 130. The first isolation part 111 is used for absorbing heat and transferring the heat to the heat dissipation component 130 through the bending part 113 and the second isolation part 112. The thermal conductivity coefficient of the bending part 113 is greater than that of the first isolation part 111 and the second isolation part 112.

[0051] In the technical solution of the embodiment of the application, the first isolation part 111 is arranged between two adjacent battery monomers 20, which is conducive to reducing the heat conduction between the adjacent battery monomers 20; the second isolation part 112 is arranged between the battery monomer 20 and the heat dissipation component 130, which is conducive to transferring the heat absorbed by the first isolation part 111 to the heat dissipation component 130, and then dissipating heat through the heat dissipation component 130, thereby improving the heat dissipation capacity of the battery. The bending part 113 connects the first isolation part 111 and the second isolation part 112 to form an integrated structure, which is conducive to maintaining the continuity of the heat conduction path. By adjusting the thermal conductivity of the bending part 113 to be greater than the thermal conductivity of the first isolation part 111 and the second isolation part 112, the heat can be transferred faster in the bending part 113. After the first isolation part 111 absorbs heat, the heat is rapidly transferred to the second isolation part 112 through the high-thermal-conductivity bending part 113, and then transferred to the heat dissipation component 130 through the second isolation part 112. Such a design is conducive to optimizing the heat conduction path, reducing the risk of local overheating, and further improving the heat conduction efficiency between the battery monomer 20 and the heat dissipation component 130, so that the heat generated by the battery monomer 20 during operation can be transferred faster from the first isolation part 111 to the heat dissipation component 130, thereby improving the heat dissipation capacity of the battery.

[0052] In any embodiment, the bending part 113 is provided with a filling part, and the filling part is filled with liquid metal. Since the area of the bending part 113 is limited, this area will limit the transmission of the first isolation part 111 to the second isolation part 112. By filling the filling part with liquid metal, the heat dissipation capacity of the bending part 113 can be improved.

[0053] In any embodiment, the liquid metal includes at least one of a bismuth-indium-tin alloy, a gallium-magnesium alloy, and a gallium-indium-tin alloy. The liquid metal in the above range has high thermal conductivity, and its application in the bending part 113 can improve the heat dissipation capacity of the bending part 113.

[0054] In any embodiment, the volume ratio of the liquid metal to the total volume of the bending part 113 is 30% to 40%. By adjusting the volume ratio of the liquid metal to the above range, the best balance between heat conduction efficiency and structural stability can be achieved. At this ratio, the liquid metal can form a heat conduction network, which is conducive to improving the heat dissipation capacity of the bending part 113 while having little effect on the mechanical properties of the bending part 113. The volume ratio of the liquid metal is 30%, 32%, 34%, 36%, 38%, 40%, or a range value composed of any two of the above values, such as 30% to 32%, 32% to 34%, 34% to 36%, 36% to 38%, 38% to 40%, etc.

[0055] In any embodiment, the bending portion 113 comprises a first sub-portion 113a and a second sub-portion 113b connected to each other, the first sub-portion 113a is connected to the first isolation portion 111, the second sub-portion 113b is connected to the second isolation portion 112, and an included angle is formed between the first sub-portion 113a and the second sub-portion 113b; the first sub-portion 113a is provided with a first filling slot, and / or the second sub-portion 113b is provided with a second filling slot, and the first filling slot and / or the second filling slot is a filling portion. The bending portion 113 realizes a structural transition through the combination of the first sub-portion 113a and the second sub-portion 113b, and the included angle design can adapt to different installation space requirements. The first filling slot provided on the first sub-portion 113a and / or the second filling slot provided on the second sub-portion 113b can be filled with liquid metal, thereby improving the heat dissipation capacity of the bending portion 113.

[0056] In an embodiment, the first filling slot and / or the second filling slot is a through slot. For example, the first filling slot extends from one side of the first sub-portion 113a to the other side opposite to it. For example, the second filling slot extends from one side of the second sub-portion 113b to the other side opposite to it.

[0057] In an embodiment, the first filling slot and / or the second filling slot is a closed structure with four side walls, and liquid metal is filled in the first filling slot and / or the second filling slot. The four side walls of the first filling slot and / or the second filling slot can form a rigid frame, which is conducive to improving the structural stability of the bending portion 113.

[0058] In any embodiment, the battery device 100 further comprises a covering layer, the covering layer is arranged on the surface of the first sub-portion 113a and covers the first filling slot, and / or the covering layer is arranged on the surface of the second sub-portion 113b and covers the second filling slot. By covering the surface of the first sub-portion 113a and / or the surface of the second sub-portion 113b with the covering layer, the liquid metal can be sealed in the first filling slot and / or the second filling slot, which is conducive to improving the sealing performance. In addition, the covering of the first filling slot and / or the second filling slot by the covering layer can also enhance the mechanical strength of the first sub-portion 113a and / or the second sub-portion 113b, which is conducive to reducing the influence of external impact on the first sub-portion 113a and / or the second sub-portion 113b.

[0059] In an embodiment, the material of the covering layer can be selected from silicone. In specific implementation, the covering layer can be directly attached to the surface of the first sub-portion 113a and / or the surface of the second sub-portion 113b by hot press molding, or fixed by adhesive. The covering layer can also be formed into a continuous covering layer by spraying process, or integrally formed with the first sub-portion 113a and / or the second sub-portion 113b by mold injection. When the covering layer covers the first filling slot and the second filling slot at the same time, independent covering can be realized by a separation structure, or a whole covering scheme can be adopted.

[0060] In an embodiment, the covering layer is in the same plane as the surface of the first isolation part 111 and the second isolation part 112, which is conducive to the close arrangement of the battery monomers 20.

[0061] In an embodiment, the covering layer protrudes from the surface of the first isolation part 111 and the second isolation part 112 to form a boss structure, which is simple in process requirements.

[0062] In any embodiment, the slot width of the first filling slot is 1 mm to 3 mm; and / or, the slot width of the second filling slot is 1 mm to 3 mm. By adjusting the slot width of the first filling slot and / or the second filling slot to the above range, on the one hand, it is conducive to improving the filling amount of the liquid metal, and in turn, it is conducive to improving the heat dissipation capacity of the bending part 113; on the other hand, it is conducive to reducing the influence on the mechanical properties of the bending part 113. Wherein, the slot width of the first filling slot is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., or a range value composed of any two of the above values, for example, 1 mm to 1.5 mm, 1.5 mm to 2 mm, 2 mm to 2.5 mm, 2.5 mm to 3 mm, etc.; the slot width of the second filling slot is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., or a range value composed of any two of the above values, for example, 1 mm to 1.5 mm, 1.5 mm to 2 mm, 2 mm to 2.5 mm, 2.5 mm to 3 mm, etc.

[0063] In any embodiment, the thermal conductivity of the first isolation part 111 and the second isolation part 112 is 0.25 W / (m·K) to 0.35 W / (m·K); and / or the thermal conductivity of the bending part 113 is 13 W / (m·K) to 16 W / (m·K). By adjusting the thermal conductivity of the first isolation part 111 and the second isolation part 112 to the above range, on the one hand, it is beneficial to transfer the heat generated by the battery monomer 20 out; on the other hand, it is beneficial to reduce the heat conduction between adjacent battery monomers 20. By adjusting the thermal conductivity of the bending part 113 to the above range, it is beneficial to locally dissipate heat quickly, thereby improving the heat dissipation capacity of the bending part 113. The thermal conductivity of the first isolation part 111 and the second isolation part 112 is 0.25 W / (m·K), 0.27 W / (m·K), 0.30 W / (m·K), 0.32 W / (m·K), 0.35 W / (m·K), or a range value composed of any two of the above values, for example, 0.25 W / (m·K) to 0.27 W / (m·K), 0.27 W / (m·K) to 0.30 W / (m·K), 0.30 W / (m·K) to 0.32 W / (m·K), 0.32 W / (m·K) to 0.35 W / (m·K), etc. The thermal conductivity of the bending part 113 is 13 W / (m·K), 14 W / (m·K), 15 W / (m·K), 16 W / (m·K), etc., or a range value composed of any two of the above values, for example, 13 W / (m·K) to 14 W / (m·K), 14 W / (m·K) to 15 W / (m·K), 15 W / (m·K) to 16 W / (m·K), etc.

[0064] In any embodiment, the isolation pad 110 includes a main material and a heat-conducting material, the heat-conducting material includes a metal material and / or a ceramic material, and the main material includes silica gel and / or aerogel. The isolation pad 110 includes a main material and a heat-conducting material, the main material can provide a basic heat insulation barrier, and the heat-conducting material improves the heat conduction effect of the isolation pad 110. The metal material has excellent thermal conductivity, and its application in the isolation pad 110 can improve the heat dissipation capacity of the isolation pad 110. The ceramic material has excellent electrical insulation performance, and its application in the isolation pad 110 can maintain the overall electrical insulation performance of the main material while enhancing the heat dissipation capacity of the isolation pad 110. The silica gel and the aerogel have excellent thermal stability and heat insulation performance, and their application in the isolation pad 110 can delay the spread of heat between adjacent battery monomers 20 to a certain extent in the event of battery thermal runaway.

[0065] In any embodiment, the metal material comprises at least one of copper, aluminum, zinc; and / or, the ceramic material comprises at least one of aluminum oxide, aluminum nitride, boron nitride, silicon carbide; and / or, the volume ratio of the metal material is 5% to 10% based on the total volume of the isolation pad 110; and / or, the volume ratio of the ceramic material is 0.5% to 3% based on the total volume of the isolation pad 110; and / or, the volume average particle size DV50 of the metal material is 28 μm to 45 μm; and / or, the volume average particle size DV50 of the ceramic material is 30 nm to 60 nm. The metal material in the above range has excellent thermal conductivity, and its application in the isolation pad 110 can improve the heat conduction capacity of the isolation pad 110. The ceramic material in the above range has excellent electrical insulation performance, and its application in the isolation pad 110 can maintain the electrical insulation performance of the overall bulk material while enhancing the heat conduction capacity of the isolation pad 110. When the volume ratio of the metal material is 5% to 10% and / or the volume ratio of the ceramic material is 0.5% to 3% based on the total volume of the isolation pad 110, on the one hand, it is beneficial to transfer the heat generated by the battery monomer 20 from the high-temperature side to the low-temperature side, thereby improving the heat dissipation capacity of the battery monomer 20; on the other hand, the isolation pad 110 can still provide good thermal insulation performance, which is beneficial to reduce the heat conduction between adjacent battery monomers 20. In addition, when the volume ratio of the metal material and / or the ceramic material is in the above range, the proportion of the bulk material is large, which maintains the self-supporting property of the isolation pad 110, and is also beneficial to balance the heat conduction and thermal insulation requirements of the isolation pad 110. By adjusting the volume average particle size DV50 of the metal material and / or the ceramic material to be in the above range, it is beneficial to form a continuous heat conduction network of the metal material and / or the ceramic material in the bulk material, thereby improving the heat conduction performance of the isolation pad 110. The volume ratio of the metal material based on the total volume of the isolation pad 110 is 5%, 6%, 7%, 8%, 9%, 10%, or a range value composed of any two of the above values, such as 5% to 6%, 6% to 7%, 7% to 8%, 8% to 9%, 9% to 10%, etc. The volume ratio of the ceramic material based on the total volume of the isolation pad 110 is 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, or a range value composed of any two of the above values, such as 0.5% to 1%, 1% to 1.5%, 1.5% to 2%, 2% to 2.5%, 2.5% to 3%, etc. The volume average particle size DV50 of the metal material is 28 μm, 32 μm, 37 μm, 41 μm, 45 μm, or a range value composed of any two of the above values, such as 28 μm to 32 μm, 32 μm to 37 μm, 37 μm to 41 μm, 41 μm to 45 μm, etc.The volume average particle size DV50 of the ceramic material is 30 nm, 38 nm, 43 nm, 52 nm, 60 nm, or a range formed by any two of the above values, for example, 30 nm to 38 nm, 38 nm to 43 nm, 43 nm to 52 nm, 52 nm to 60 nm, etc.

[0066] In an embodiment, the second isolation part 112 is arranged on the bottom surface of the battery monomer 20 and in contact with the heat dissipation component 130. The bottom surface of the battery monomer 20 refers to the surface of the battery monomer 20 that is relatively close to or below the ground. This design is conducive to quickly transferring the heat of the battery monomer 20 to the heat dissipation component 130 and dissipating the heat through the heat dissipation component 130.

[0067] In an embodiment, the first isolation part 111 is arranged between the large surfaces of two adjacent battery monomers 20. The large surface of the battery monomer 20 refers to the surface with the largest surface area of the battery monomer 20. Arranging the first isolation part 111 between the large surfaces of two adjacent battery monomers 20 is conducive to increasing the contact area between the battery monomer 20 and the isolation pad 110, thereby facilitating heat dissipation of the battery monomer 20.

[0068] In an embodiment, the isolation pad 110 completely covers the large surface and the bottom surface of the battery monomer 20. This design is conducive to increasing the contact area between the isolation pad 110 and the battery monomer 20, thereby facilitating heat dissipation of the battery monomer 20.

[0069] In any embodiment, the isolation pad 110 further comprises a phase change material with a phase change temperature of 80℃ to 150℃. The phase change material can change phase when the heat is high, and can absorb the heat generated in the battery thermal runaway moment, thereby delaying the spread of heat. By selecting a phase change material with a phase change temperature of 80℃ to 150℃, on the one hand, the phase change material will not change phase at the normal working temperature of the battery monomer 20, reducing the phase change cycle times of the phase change material and prolonging the service life of the phase change material; on the other hand, when the battery monomer 20 occurs thermal runaway and the temperature rises, the phase change material can change phase and absorb the heat generated by the battery in the thermal runaway, thereby delaying the spread of heat. The phase change temperature of the phase change material is 80℃, 100℃, 120℃, 150℃, or a range formed by any two of the above values, for example, 80℃ to 100℃, 100℃ to 120℃, 120℃ to 150℃, etc.

[0070] In any embodiment, the phase change material includes a waxy material and / or a fatty acid material; and / or, the volume ratio of the phase change material is 7% to 10% based on the total volume of the isolation pad 110. The waxy material and the fatty acid material have excellent latent heat of phase change characteristics, and can absorb heat generated in the battery thermal runaway moment when the heat is high, which is conducive to delaying the spread of heat. By adjusting the volume ratio of the phase change material to the above range, the best balance between heat conduction efficiency and structural stability can be achieved. The phase change material at the above ratio can effectively absorb the heat generated by the battery during operation and delay the temperature rise rate, and its physical form has little effect on the mechanical properties of the isolation pad 110. The volume ratio of the phase change material is 7%, 8%, 9%, 10%, or a range value composed of any two of the above values, for example, 7% to 8%, 8% to 9%, 9% to 10%, etc.

[0071] In an embodiment, the waxy material includes paraffin wax, which has excellent latent heat of phase change characteristics and can store more heat. In addition, paraffin wax has good chemical stability and can repeatedly undergo endothermic and exothermic phase changes, has low leakage risk and high safety.

[0072] In an embodiment, the fatty acid material includes stearic acid and palmitic acid, which have excellent latent heat of phase change characteristics and can store more heat.

[0073] In any embodiment, please refer to Figure 4 and Figure 6 , Figure 6 is a structural schematic diagram of a battery cell according to an embodiment of the present application. The isolation pad 110 and the battery cell 20 are arranged close to each other on one surface of the isolation pad 110, and the other surface is provided with a heat-conducting protrusion 24 arranged in the heat-conducting groove 114. Through the cooperation of the heat-conducting protrusion 24 and the heat-conducting groove 114, the contact area between the battery cell 20 and the isolation pad 110 can be increased, which is conducive to the transmission of heat from the battery cell 20 to the isolation pad 110.

[0074] In an embodiment, the heat-conducting protrusions 24 can be circular, columnar, jagged, conical, etc., and the heat-conducting grooves 114 are shaped to match the heat-conducting protrusions 24. The maximum width of the cross section of the heat-conducting protrusions 24 is 0.3-0.5 mm. When the maximum width of the cross section of the heat-conducting protrusions 24 is within the above range, the contact area between the large face of the battery monomer 20 and the isolation pad 110 can be increased, which is conducive to the transfer of heat from the large face of the battery monomer 20 to the isolation pad 110. The maximum width of the cross section of the heat-conducting protrusions 24 can be 0.3 mm, 0.35 mm, 0.40 mm, 0.45 mm, 0.50 mm, or a range defined by any two of the above values, such as 0.3-0.35 mm, 0.35-0.40 mm, 0.40-0.45 mm, 0.45-0.50 mm, etc.

[0075] In any embodiment, the isolation pad 110 is provided with a positioning groove, and the battery monomer 20 is provided with a positioning protrusion. The positioning groove is connected with the positioning protrusion, and the surface area of the positioning protrusion is greater than the surface area of the heat-conducting protrusion 24. Through the cooperation of the positioning protrusion and the positioning groove, the precise and rapid positioning of the isolation pad 110 and the battery monomer 20 can be achieved, which improves the assembly efficiency and reduces the manual error. By adjusting the surface area of the positioning protrusion to be greater than the surface area of the heat-conducting protrusion 24, the pressure between the positioning protrusion and the positioning groove can be reduced, which is further conducive to improving the structural reliability and service life of the isolation pad 110 and the battery monomer 20.

[0076] In any embodiment, the battery device 100 further comprises a buffer pad 120. Please refer to Figure 7 , Figure 7 is a structural schematic diagram of the buffer pad of an embodiment of the present application. The buffer pad 120 is arranged between two adjacent battery monomers 20, and along the arrangement direction of the plurality of battery monomers 20, the buffer pad 120 and the isolation pad 110 are arranged alternately. The buffer pad 120 is in a ring structure, and the buffer pad 120 is arranged at the periphery of the battery monomer 20. When the battery monomer 20 is subjected to thermal expansion or mechanical vibration, the buffer pad 120 can absorb stress by deforming itself, and the ring structure of the buffer pad 120 is conducive to keeping the stress uniform in all directions of the battery monomer 20. The alternately arranged isolation pad 110 and buffer pad 120 can meet the needs of heat conduction control and mechanical isolation. The isolation pad 110 is conducive to quickly conducting the heat generated by the battery monomer 20, and the buffer pad 120 can release mechanical stress by elastic deformation. In addition, this structural design can also adapt to the size tolerance of the battery monomer 20, which is conducive to the compatibility in the assembly process.

[0077] In an embodiment, the buffer pad 120 is an annular structure discontinuously distributed along the periphery of the battery monomer 20, and the buffer pad 120 includes two independent arc-shaped segments, and a gap is formed between the two independent arc-shaped segments. In this way, when the battery monomer 20 expands, the buffer pad 120 not only provides a certain buffering space, but also reduces the amount of the buffer pad 120, thereby reducing the cost of the buffer pad 120.

[0078] In an embodiment, the battery device 100 further includes two end plates 140, and the two end plates 140 are respectively attached to the first and last outer side surfaces of the battery monomer 20 stack. On the upper and lower ends of the four side surfaces of the battery monomer 20 stack, a packing belt is respectively sleeved, and the packing belt is used to fix the battery monomers 20 together.

[0079] Please refer to Figure 8 , Figure 8 is an exploded view of an embodiment of the battery monomer of the present application, Figure 8 X, Y, and Z represent the directions of the three-dimensional spatial coordinate axes. The battery monomer 20 refers to the smallest unit that constitutes the battery device 100. The battery monomer 20 includes an end cover 21, a shell 22, a cell assembly 23, and other functional components.

[0080] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Alternatively, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easily deformed when subjected to extrusion and collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as an electrode terminal 21a. The electrode terminal 21a can be used to electrically connect with the cell assembly 23 for outputting or inputting the electrical energy of the battery monomer 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery monomer 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 21, and the insulating piece can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0081] The shell 22 is a component for cooperating with the end cover 21 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be provided on the shell 22, and the end cover 21 is made to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 21 and the shell 22 can also be integrated, specifically, the end cover 21 and the shell 22 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 22, the end cover 21 is made to cover the shell 22. The shell 22 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereto.

[0082] The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 can be contained in the shell 22. The electrode assembly 23 is mainly formed by winding or stacking the positive and negative electrode plates, and a separator is usually provided between the positive and negative electrode plates. The positive and negative electrode plates have a part of active material constituting the main body of the electrode assembly, and the parts of the positive and negative electrode plates without active material each constitute the tab 23a. The positive and negative tabs can be located at one end of the main body or at two ends of the main body respectively. In the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tab 23a is connected to the electrode terminal 21a to form a current loop.

[0083] The second aspect of the present application provides a storage energy device, which has at least the same advantages as the first aspect of the battery device.

[0084] Please refer to Figure 9 , Figure 9 The structural schematic diagram of the storage energy device provided by an embodiment of the present application is shown. The storage energy device 200 comprises a storage energy box 210, and the storage energy box 210 is provided with the battery device 100.

[0085] As an example, the storage energy device 200 can be a storage energy container, a storage energy cabinet, etc.

[0086] As an example, the energy storage device 200 can be used in an energy storage power station, a wind power system, a solar power 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 provide electric energy for related users or electric equipment during the peak electricity consumption period. The wind power generator set of the wind power system can collect wind energy and convert it into electric energy, which is stored by the energy storage device 200. The solar power system can convert solar energy into electric energy, which is stored by the energy storage device 200 and supplied to users in time. The mobile power system can supply power to related electric equipment in places where the power grid supply system cannot reach, such as remote mountainous areas and remote wild areas. The temporary power supply system can supply power to users in the case of insufficient power supply.

[0087] The third aspect of the present application provides an energy storage system, which has at least the same advantages of the battery device of the first aspect, and / or the same advantages of the energy storage device of the second aspect.

[0088] Please refer to Figure 10 , Figure 10 The structure diagram of the energy storage system provided by an embodiment of the present application is shown. The energy storage system 2000 includes an energy storage converter 400, which can be electrically connected to a power generation device 3000 to convert the electric power provided by the power generation device 3000. The energy storage system 2000 can also include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 guides the electric energy provided by the power generation device 3000 to the energy storage device 200 after power conversion for storage.

[0089] The power conversion device is used to connect between the power generation device 3000 and the energy storage device 200. The power generation device 3000 is used to generate electric energy, and the power generation device 3000 is used to store the generated electric energy to the energy storage device 200 through the power conversion device. The energy storage system 2000 applies the energy storage device 200, which can effectively improve the operation safety of the energy storage system 2000.

[0090] As an example, as shown in Figure 10 , the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. Two power generation devices 3000 respectively transmit the generated electric energy to the energy storage converter 400, and guide the electric energy to the energy storage device 200 through the energy storage converter 400 for storage.

[0091] The fourth aspect of the present application provides a charging network, which has at least the same advantages of the battery device of the first aspect, and / or the same advantages of the energy storage device of the second aspect, and / or the same advantages of the energy storage system of the third aspect.

[0092] Please refer to Figure 11 ,Figure 11 A structural schematic diagram of a charging network is provided for an embodiment of the present application. The charging network 1000 includes a charging pile 300, which is used to charge an electrical equipment. The charging network 1000 can also include an energy storage device 200, which is electrically connected with the charging pile 300, and is used to provide electrical energy for the charging pile 300.

[0093] It should be noted that the charging pile 300 is electrically connected with the battery monomer in the energy storage device 200 through a cable, and the battery monomer can provide the electrical energy stored by itself to the charging pile 300. The charging pile 300 has a connector, which can be connected with the electrical equipment, so as to charge the electrical equipment. The charging network 1000 applies the energy storage device 200, which can effectively improve the safety of the charging network 1000, and also helps to improve the flexibility of the charging network 1000 when deployed.

[0094] In one charging network 1000, the charging pile 300 can be one, and the energy storage device 200 provides electrical energy for the charging pile 300; the charging pile 300 can also be multiple, and the energy storage device 200 provides electrical energy for multiple charging piles 300.

[0095] As an example, as shown in Figure 11 The charging network 1000 includes one energy storage device 200 and two charging piles 300, and one energy storage device 200 provides electrical energy for two charging piles 300.

[0096] The energy storage device 200 can include a battery device 100, which is electrically connected with the charging pile 300, so as to provide electrical energy for the charging pile 300.

[0097] The beneficial effects of the present application will be further described in conjunction with the embodiments.

[0098] In order to make the technical problems, technical solutions and beneficial effects solved by the embodiments of the present application more clear, the following will be further described in detail in conjunction with the embodiments and the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0099] Embodiment 1

[0100] Preparation of isolation pad

[0101] The heat-conducting material is added to the silica gel and stirred at 3000 rpm for 30 min. After uniform stirring, 0.5 wt% of a dispersing agent (sodium dodecyl benzene sulfonate) is added to obtain a slurry.

[0102] The slurry is molded at 170°C and 10 MPa for 15 min to preliminarily cross-link and shape the isolation pad. The isolation pad comprises a first isolation part, a second isolation part, and a bending part. The bending part comprises a first sub-part and a second sub-part connected to each other. The first sub-part is connected to the first isolation part, and the second sub-part is connected to the second isolation part. An included angle is formed between the first sub-part and the second sub-part.

[0103] The type of the heat-conducting material, the volume ratio of the heat-conducting material to the total volume of the isolation pad, the DV50 of the heat-conducting material, the thermal conductivity of the first isolation part and the second isolation part, and the thermal conductivity of the bending part are shown in Table 1.

[0104] Preparation of the battery device

[0105] The isolation pad and the buffer pad are alternately arranged between adjacent battery monomers along the arrangement direction of the battery monomers. The first isolation part is arranged between the two adjacent battery monomers, and the second isolation part is arranged between the bottom surface of the battery monomer and the heat-dissipating component. The material of the buffer pad is silica gel. The buffer pad has a ring structure and is arranged at the periphery of the battery monomer.

[0106] Example 2

[0107] Preparation of the isolation pad

[0108] The heat-conducting material and the paraffin (phase change material) are added to the silica gel and stirred at 3000 rpm for 30 min. After uniform stirring, 0.5 wt% of a dispersing agent (sodium dodecyl benzene sulfonate) is added to obtain a slurry.

[0109] The slurry is molded at 170°C and 10 MPa for 15 min to preliminarily cross-link and shape the isolation pad. The isolation pad comprises a first isolation part, a second isolation part, and a bending part. The bending part comprises a first sub-part and a second sub-part connected to each other. The first sub-part is connected to the first isolation part, and the second sub-part is connected to the second isolation part. An included angle is formed between the first sub-part and the second sub-part.

[0110] The type of the heat-conducting material, the volume ratio of the heat-conducting material to the total volume of the isolation pad, the DV50 of the heat-conducting material, the volume ratio of the paraffin (phase change material) to the total volume of the isolation pad, the thermal conductivity of the first isolation part and the second isolation part, and the thermal conductivity of the bending part are shown in Table 1.

[0111] Preparation of the battery device

[0112] The isolation pad and the buffer pad are alternately arranged between adjacent battery monomers along the arrangement direction of the plurality of battery monomers, wherein the first isolation part is arranged between two adjacent battery monomers, and the second isolation part is arranged between the bottom surface of the battery monomer and the heat dissipation component; the material of the buffer pad is silica gel, the buffer pad has a ring structure, and the buffer pad is arranged at the periphery of the battery monomer.

[0113] Example 3

[0114] The preparation of the isolation pad adds a heat-conducting material and paraffin (a phase change material) into silica gel, stirs at a high speed of 3000 rpm for 30 min, and then adds 0.5 wt% of a dispersant (sodium dodecyl benzene sulfonate) to obtain a slurry.

[0115] The slurry is molded at 170 DEG C and 10 MPa for 15 min to preliminarily cross-link and shape an intermediate. The intermediate includes the first isolation part, the second isolation part, and the bending part, the bending part includes the first sub-part and the second sub-part connected to each other, the first sub-part is connected to the first isolation part, the second sub-part is connected to the second isolation part, and an included angle is formed between the first sub-part and the second sub-part. A first filling groove is engraved on the first sub-part by laser, and a second filling groove is engraved on the second sub-part by laser, the groove width of the first filling groove and the second filling groove is 2 mm, and the positions of the first filling groove and the second filling groove are based on the included angle. Liquid metal is filled in the first filling groove and the second filling groove.

[0116] After the liquid metal is filled in the first filling groove and the second filling groove, vacuum exhaust is performed at 0.3 MPa, and then an upper silica gel sheet is covered, vacuum treatment is performed at 200 DEG C and 1 MPa for 2 h to complete cross-linking, and the isolation pad is obtained.

[0117] The types of the heat-conducting material, the volume ratio of the heat-conducting material to the total volume of the isolation pad, the DV50 of the heat-conducting material, the volume ratio of the paraffin (a phase change material) to the total volume of the isolation pad, the types of the liquid metal, the volume ratio of the liquid metal to the total volume of the bending part, the thermal conductivities of the first isolation part and the second isolation part, and the thermal conductivity of the bending part are shown in Table 1.

[0118] Preparation of the battery device

[0119] The isolation pad and the buffer pad are alternately arranged between adjacent battery monomers along the arrangement direction of the plurality of battery monomers, wherein the first isolation part is arranged between two adjacent battery monomers, and the second isolation part is arranged between the bottom surface of the battery monomer and the heat dissipation component; the material of the buffer pad is silica gel, the buffer pad has a ring structure, and the buffer pad is arranged at the periphery of the battery monomer.

[0120] Example 4

[0121] The difference between example 4 and example 3 is that the volume ratio of paraffin (phase change material) to the total volume of the isolation pad; the volume ratio of liquid metal to the total volume of the bending part; the thermal conductivity of the first isolation part, the second isolation part; the thermal conductivity of the bending part is different, the specific value is shown in table 1.

[0122] Example 5

[0123] The difference between example 5 and example 4 is that the volume ratio of liquid metal to the total volume of the bending part; the thermal conductivity of the bending part is different, the specific value is shown in table 1.

[0124] Example 6

[0125] The difference between example 6 and example 5 is that the type of heat conducting material; the thermal conductivity of the first isolation part, the second isolation part; the type of liquid metal; the thermal conductivity of the bending part is different, the specific value is shown in table 1.

[0126] Example 7

[0127] The difference between example 7 and example 5 is that the type of heat conducting material; the thermal conductivity of the first isolation part, the second isolation part; the type of liquid metal; the thermal conductivity of the bending part is different, the specific value is shown in table 1.

[0128] Example 8

[0129] The difference between example 8 and example 5 is that the type of heat conducting material; the volume ratio of heat conducting material to the total volume of the isolation pad; the DV50 of heat conducting material; the type of liquid metal is different, the specific value is shown in table 1.

[0130] Example 9

[0131] The difference between example 9 and example 5 is that the type of heat conducting material; the volume ratio of heat conducting material to the total volume of the isolation pad; the DV50 of heat conducting material; the thermal conductivity of the first isolation part, the second isolation part; the type of liquid metal is different, the specific value is shown in table 1.

[0132] Comparative example 1

[0133] The difference between comparative example 1 and example 1 is that the material of the isolation pad is silica gel, and no heat conducting material is added in the silica gel.

[0134] The specific test method of the related parameters is as follows:

[0135] 1. The volume ratio of heat conducting material to the total volume of the isolation pad test method.

[0136] The test is performed in accordance with the EPA 6010D-2014 standard; specifically, an ICP-OES (elemental analysis-inductively coupled plasma atomic emission spectrometry) test can be used, in which the sample to be tested is first dissolved into a liquid with a strong acid, and then the liquid is introduced into an ICP light source by atomization, and further, the gaseous atoms to be tested are ionized and excited in a strong magnetic field, and then return to the ground state from the excited state; in the above process, energy is released and recorded as different characteristic spectral lines, and element quantitative analysis is performed to obtain the mass of the thermally conductive material. The volume of the thermally conductive material is obtained by the mass of the thermally conductive material and the density of the thermally conductive material, and the volume ratio of the thermally conductive material = (volume of the thermally conductive material / volume of the insulation pad) x 100%.

[0137] 2. Volume ratio of paraffin, tested based on the total volume of the insulation pad.

[0138] The test is performed using a thermal gravimetric analyzer, 5±0.1 mg of the insulation pad is taken, the temperature is raised from 25℃ to 600℃ under N2 atmosphere at a rate of 5℃ / min, and the paraffin content is calculated based on the weight loss rate from 300℃ to 450℃. The mass of the paraffin is calculated based on the paraffin content and the mass of the insulation pad, the volume of the paraffin is calculated based on the density of the paraffin and the mass of the paraffin, and the volume ratio of the paraffin = (volume of the paraffin / volume of the insulation pad) x 100%.

[0139] 3. Volume ratio of liquid metal, tested based on the total volume of the bending part.

[0140] The test is performed in accordance with the EPA 6010D-2014 standard; specifically, an ICP-OES (elemental analysis-inductively coupled plasma atomic emission spectrometry) test can be used, in which the sample to be tested is first dissolved into a liquid with a strong acid, and then the liquid is introduced into an ICP light source by atomization, and further, the gaseous atoms to be tested are ionized and excited in a strong magnetic field, and then return to the ground state from the excited state; in the above process, energy is released and recorded as different characteristic spectral lines, and element quantitative analysis is performed to obtain the mass of the thermally conductive material. The volume of the thermally conductive material is obtained by the mass of the thermally conductive material and the density of the thermally conductive material, and the volume ratio of the thermally conductive material = (volume of the thermally conductive material / volume of the insulation pad) x 100%.

[0141] 4. Thermal conductivity test method.

[0142] The thermal conductivity of the sample to be tested is tested in accordance with the standard "ISO 22007-2:2008 Transient plane heat source method for determining thermal conductivity of materials".

[0143] 5. Volume average particle size DV50 test method of the thermally conductive material.

[0144] First, the sample to be tested is placed in a 600℃ muffle furnace for 2h to burn off the silica gel and organic matrix, leaving only the inorganic filler.

[0145] Determined by laser diffraction particle size analysis method. Refer to the standard GB / T 19077-2016, and use a laser particle size analyzer (for example, Malvern Master Size 3000) to determine.

[0146] 6. Temperature reduction rate test method.

[0147] Under the same test conditions, the temperature at the edge center of the explosion-proof valve of the battery monomer in Examples 1-9 and Comparative Example 1 was tested by a temperature sensor, and the temperature reduction rate = (temperature at the edge center of the explosion-proof valve of the battery monomer in Comparative Example 1 - temperature at the edge center of the explosion-proof valve of the battery monomer in Examples) / temperature at the edge center of the explosion-proof valve of the battery monomer in Comparative Example 1.

[0148] Table 1 Performance parameters of isolation pads and battery devices

[0149]

[0150] Note: The volume percentage of the heat-conducting material represents the volume percentage of the heat-conducting material based on the total volume of the isolation pad; the volume percentage of the liquid metal represents the volume percentage of the liquid metal based on the total volume of the bending part; thermal conductivity 1 represents the thermal conductivity of the first isolation part and the second isolation part; thermal conductivity 2 represents the thermal conductivity of the bending part; the units of thermal conductivity 1 and thermal conductivity 2 are W / (m·K); in Example 9, 6% and 1% represent the volume percentage of copper is 6% and the volume percentage of Al2O3 is 1% based on the total volume of the isolation pad; in Example 9, 32 μm and 43 nm represent the DV50 of copper is 32 μm and the DV50 of Al2O3 is 43 nm.

[0151] 1) In Examples 1-9, the temperature reduction rate of the temperature at the edge center of the explosion-proof valve of the battery monomer relative to the temperature at the edge center of the explosion-proof valve of the battery monomer in Comparative Example 1 is 3.33%-15.56%. It can be seen that, compared with Comparative Example 1, the battery heat dissipation performance of the battery device in Examples 1-9 is better. This is because, in Examples 1-9, the heat-conducting material is added to the isolation pad, which can quickly transfer the heat generated by the battery monomer to the heat dissipation component, and then dissipate heat through the heat dissipation component, thereby improving the heat dissipation capacity of the battery.

[0152] 2) Compared with Example 1, the temperature reduction rate of the temperature at the edge center of the explosion-proof valve of the battery monomer in Example 2 is greater, which indicates that the battery heat dissipation performance of the battery device in Example 2 is better. This is because, in Example 2, paraffin is also added to the isolation pad, which can absorb the heat generated in the instant of battery thermal runaway when the heat is high.

[0153] 3) Compared with Example 2, the temperature reduction rate of the edge center of the explosion-proof valve of the battery monomer in Examples 3-5 is greater at 20 mm from the positive pole, which indicates that the battery heat dissipation performance of the battery device in Examples 3-5 is better. This is because, in Examples 3-5, the bending part in the isolation pad adds liquid metal, which has high thermal conductivity. Applying it to the bending part can improve the heat dissipation capacity of the bending part, and in turn improve the heat dissipation capacity of the battery.

[0154] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and embodiments having the same technical idea and playing the same role and effect within the scope of the technical solutions of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications that can be thought of by those skilled in the art are applied to the embodiments, and other ways constructed by combining part of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A battery device, characterized by, The battery device comprises: a plurality of battery cells; a heat dissipation component for dissipating heat of the plurality of battery cells; an isolation pad comprising a first isolation part, a second isolation part, and a bending part, the bending part connecting the first isolation part and the second isolation part, the first isolation part being arranged between two adjacent battery cells, and the second isolation part being arranged between the battery cell and the heat dissipation component; the first isolation part is used for absorbing heat and transferring the heat to the heat dissipation component through the bending part and the second isolation part; a thermal conductivity of the bending part is greater than that of the first isolation part and the second isolation part.

2. The battery device according to claim 1, characterized by The bending part is provided with a filling part filled with liquid metal.

3. The battery device of claim 2, wherein The liquid metal comprises at least one of bismuth-indium-tin alloy, gallium-magnesium alloy, and gallium-indium-tin alloy.

4. The battery device according to claim 2 or 3, characterized by The volume ratio of the liquid metal to the total volume of the bending part is 30% to 40%.

5. The battery device of claim 2, wherein The bending part comprises a first sub-part and a second sub-part connected to each other, the first sub-part being connected to the first isolation part, the second sub-part being connected to the second isolation part, and an included angle being formed between the first sub-part and the second sub-part. The first sub-part is provided with a first filling groove, and / or the second sub-part is provided with a second filling groove, the first filling groove and / or the second filling groove being the filling part.

6. The battery device of claim 5, wherein The battery device further comprises a cover layer arranged on the surface of the first sub-part and covering the first filling groove, and / or, the cover layer is arranged on the surface of the second sub-part and covering the second filling groove.

7. The battery device of claim 1, wherein The thermal conductivity of the first isolation part and the second isolation part is 0.25 W / (m·K) to 0.35 W / (m·K); and / or, the thermal conductivity of the bending part is 13 W / (m·K) to 16 W / (m·K).

8. The battery device of claim 1, wherein, The isolation pad comprises a main material and a thermal conductive material, the thermal conductive material comprising a metal material and / or a ceramic material, and the main material comprising silica gel and / or aerogel.

9. The battery device of claim 8, wherein, The metal material comprises at least one of copper, aluminum, and zinc; and / or, the ceramic material comprises at least one of aluminum oxide, aluminum nitride, boron nitride, and silicon carbide; and / or, the volume ratio of the metal material to the total volume of the isolation pad is 5% to 10%; and / or, the volume ratio of the ceramic material to the total volume of the isolation pad is 0.5% to 3%; and / or, the volume average particle size DV50 of the metal material is 28 μm to 45 μm; and / or, the volume average particle size DV50 of the ceramic material is 30 nm to 60 nm.

10. The battery device of claim 1, wherein The isolation pad further comprises a phase change material, and the phase change temperature of the phase change material is 80℃ to 150℃.

11. The battery device of claim 10, wherein, The phase change material comprises a waxy material and / or a fatty acid material; and / or, the volume ratio of the phase change material to the total volume of the isolation pad is 7% to 10%.

12. The battery device of claim 1, wherein, The isolation pad is provided with a thermal conductive groove on one surface close to the battery cell, and is provided with a thermal conductive protrusion on the other surface, the thermal conductive protrusion being arranged in the thermal conductive groove.

13. The battery device of claim 12, wherein, The isolation pad is provided with a positioning groove, the battery monomer is provided with a positioning protrusion, the positioning groove is connected with the positioning protrusion, and a surface area of the positioning protrusion is greater than a surface area of the heat conduction protrusion.

14. The battery device of claim 1, wherein, The battery device further comprises a buffer pad arranged between two adjacent battery monomers, and the buffer pad and the isolation pad are arranged alternately along the arrangement direction of the plurality of battery monomers; the buffer pad is in a ring structure, and the buffer pad is arranged at the periphery of the battery monomer.

15. An energy storage device, characterized by, The energy storage device comprises the battery device according to any one of claims 1 to 14.

16. An energy storage system characterized by, The energy storage system comprises the battery device according to any one of claims 1 to 14 and / or the energy storage device according to claim 15.

17. A charging network characterized in that, The charging network comprises: a charging pile; the battery device according to any one of claims 1 to 14 and / or the energy storage device according to claim 15 and / or the energy storage system according to claim 16.

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