Thermal management device of battery cell, battery module and energy storage equipment

Abstract

The utility model provides a thermal management device of a battery cell, a battery module and energy storage equipment, the thermal management device comprises a support member, a plurality of thermal insulation members and a heating assembly, the plurality of thermal insulation members are connected to the support member, the plurality of thermal insulation members are arranged at intervals along a first direction of the support member, and the heating assembly is connected to the support member. An accommodating groove for accommodating a battery cell is defined by two adjacent heat insulation pieces and the supporting piece; the heating assembly comprises a plurality of heating films and a plurality of conductive connecting pieces, and at least one heating film is connected to the side, facing the containing groove, of one heat insulation piece in an attached mode. And each conductive connecting piece is connected with two adjacent heating films, so that the plurality of heating films are connected in series through the plurality of conductive connecting pieces. As the current in the series circuit is the same, the heating effect of each heating film is relatively consistent, so that the problem of local overheating or non-uniform heating of the battery cells at different positions is reduced. And in a low-temperature environment, the heating films connected in series can transfer heat more uniformly, so that the starting and discharging performance of the battery is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a thermal management device for a battery cell, a battery module, and an energy storage device. Background Art

[0002] Energy storage devices are an indispensable part of modern power systems and energy management. Their core function is to store energy for release when needed. These devices can be mobile power sources or other forms of energy storage devices. In these energy storage devices, the battery module is a key component. A battery module is generally composed of multiple battery cells (battery units) combined in series or parallel to provide the required voltage and current.

[0003] The thermal management device for a battery cell is an important part of a battery module. Its main function is to control and regulate the temperature of the battery cell to ensure that the battery operates in the best working state. To improve the low-temperature performance of the battery cell, a heating film structure is usually provided to heat the battery cell. In related technologies, multiple heating films are connected in parallel, resulting in inconsistent heating effects of each heating film, large temperature differences between battery cells at different positions, and poor low-temperature heating performance. During long-term use, large temperature differences between battery cells can cause some battery cells to be overcharged or over-discharged, affecting their performance and lifespan. Summary of the Utility Model

[0004] Embodiments of this application provide a thermal management device for a battery cell, a battery module, and an energy storage device, aiming to improve the problem of large temperature differences between battery cells at different positions in a battery module.

[0005] On the one hand, embodiments of this application provide a thermal management device for a battery cell. The thermal management device includes a support member, a plurality of heat insulation members, and a heating assembly. The plurality of heat insulation members are connected to the support member, and the plurality of heat insulation members are arranged at intervals along a first direction of the support member. An accommodation groove for accommodating the battery cell is formed by enclosing between two adjacent heat insulation members and the support member; the heating assembly includes a plurality of heating films and a plurality of conductive connection members. At least one heating film is attached and connected to a side of one heat insulation member facing the accommodation groove, and each conductive connection member connects two adjacent heating films thereof, so that the plurality of heating films are connected in series through the plurality of conductive connection members.

[0006] The thermal management device of the battery cell in the embodiment of the present application includes a plurality of heating films connected in series through a plurality of conductive connectors. The series-connected plurality of heating films can make the plurality of battery cells heat more uniformly during the heating process. Since the current in a series circuit is the same, the heating effect of each heating film is relatively consistent, thereby reducing the problems of local overheating or uneven heating of the battery cells at different positions. In a low-temperature environment, the series-connected heating films can transfer heat more uniformly, improving the starting and discharging performance of the battery and solving the problem of poor low-temperature heating performance in parallel connection. Moreover, the temperature difference between the battery cells is effectively controlled, avoiding the large temperature difference between the battery cells at different positions in parallel connection, thereby reducing the pressure difference between the battery cells. Reducing the pressure difference and temperature difference between the battery cells helps to maintain the consistency of the battery cells and extend the cycle life of the battery module, solving the problem that the cycle life of the battery module may be shortened due to long-term use in parallel connection.

[0007] Further, since a plurality of heating films are connected in series, the control logic of the battery management system can be simpler, reducing the complexity of the control circuit, lowering the system cost and maintenance difficulty.

[0008] In a second aspect, the embodiment of the present application further provides a battery module, including a battery cell assembly and the thermal management device according to any of the above embodiments; the battery cell assembly includes a plurality of battery cells, and the battery cells are arranged in the accommodation grooves.

[0009] In the low-temperature environment, the thermal management device in the embodiment of the present application can effectively provide uniform heat for the battery cells, helping the battery module quickly reach the ideal working temperature and improving the starting performance.

[0010] In a third aspect, the embodiment of the present application further provides an energy storage device, including a housing, a control board, and the battery module according to any of the above embodiments. The battery module is arranged in the housing, and the control board is electrically connected to the battery module.

[0011] The energy storage device in the embodiment of the present application can work stably under a wider range of environmental conditions. Whether in a high-temperature or low-temperature environment, it can maintain good performance, enhancing the adaptability of the energy storage device. The stability and reliability of the energy storage device are improved, enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1Schematic perspective view of a battery module provided by an embodiment of the present application;

[0014] Figure 2 Schematic structural view of a battery module provided by an embodiment of the present application (partial battery cells are omitted);

[0015] Figure 3 Schematic structural view of a thermal management device provided by an embodiment of the present application (end plates and binding members are omitted);

[0016] Figure 4 Exploded schematic structural view of a partial structure of a thermal management device provided by an embodiment of the present application.

[0017] Explanation of reference numerals:

[0018] 1. Battery module;

[0019] 100. Thermal management device; 100a. Accommodating groove; 10. Support member; 11. Clamping groove; 20. Heat insulation member; 21. Clamping portion; 30. Heating assembly; 31. Heating film; 311. Wide surface; 312. Narrow surface; 32. Conductive connection member; 33. Conductive lead-out member; 40. End plate; 50. Binding member; 51. First strap; 52. Second strap; 200. Battery cell assembly; 210. Battery cell. Detailed description of the embodiments

[0020] In order to make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] Please refer to Figures 1 to 2 , an embodiment of the present application provides a thermal management device 100 for a battery cell 210, including a support member 10, a plurality of heat insulation members 20, and a heating assembly 30.

[0022] Among them, the plurality of heat insulation members 20 are connected to the support member 10. The support member 10 provides the structural stability of the entire thermal management device 100. The plurality of heat insulation members 20 are arranged at intervals along the first direction AA of the support member 10. The adjacent two heat insulation members 20 and the support member 10 enclose an accommodating groove 100a for accommodating the battery cell 210, ensuring that the battery cell 210 is in an appropriate position and space, ensuring the accurate position of the battery cell 210 in the accommodating groove 100a, and facilitating subsequent management and maintenance. The plurality of heat insulation members 20 can effectively isolate the influence of the external environment on the battery cell 210. The setting of the heat insulation members 20 can reduce the heat transfer between the battery cells 210, avoid the heat interference between the battery cells 210, and contribute to promoting the consistency of the battery cells 210.

[0023] Such as Figure 2 AndFigure 4 As shown, when the battery cell 210 undergoes thermal runaway, the battery cell 210 will expand. In extreme cases, if the heat insulation member 20 is not firmly connected to the support member 10, the excessive expansion of the battery cell 210 may cause the heat insulation member 20 to be extruded outside two adjacent battery cells 210, which will render the heat insulation member 20 ineffective, thus triggering the spread of thermal runaway and further causing more serious accidents such as fire and explosion. Therefore, in some embodiments, in order to achieve a firm connection between the heat insulation member 20 and the support member 10, at least one of a clamping portion 21 and a clamping groove 11 is provided at the end of the heat insulation member 20 close to the support member 10, and at least the other of the clamping portion 21 and the clamping groove 11 is provided on the support member 10. For example, the heat insulation member 20 may be alternately provided with a plurality of clamping portions 21 and clamping grooves 11, and a plurality of clamping grooves 11 and clamping portions 21 are alternately provided on the support member 10 correspondingly; or, the heat insulation member 20 is provided with a plurality of clamping portions 21, and the support member 10 is provided with a plurality of clamping grooves 11 adapted to the plurality of clamping portions 21 at corresponding positions.

[0024] Among them, one clamping portion 21 can be clamped with a corresponding one clamping groove 11, which can enhance the connection stability between the heat insulation member 20 and the support member 10. Even in the case of the expansion of the battery cell 210, its position can be kept unchanged. Since the heat insulation member 20 can keep its position, it can effectively isolate two adjacent battery cells 210, prevent the spread of thermal runaway from one battery cell 210 to another battery cell 210, and stable thermal management helps to reduce the risk of fire and explosion accidents occurring in the entire battery module 1, improving safety.

[0025] As Figure 4 shown, in some embodiments, a plurality of clamping grooves 11 are arranged at intervals along the second direction BB of the support member 10, and the clamping grooves 11 and the clamping portions 21 are arranged in one-to-one correspondence, that is, the heat insulation member 20 is provided with a plurality of clamping portions 21 adapted to the plurality of clamping grooves 11. Providing a plurality of clamping portions 21 and a plurality of clamping grooves 11 can provide multi-point fixation. Multi-point fixation can prevent the heat insulation member 20 from shifting, enhance the connection stability between the heat insulation member 20 and the support member 10, reduce loosening caused by vibration or impact, and ensure the effective isolation of the heat insulation member 20 between adjacent battery cells 210. The second direction BB is perpendicular to the first direction AA. In this embodiment, the support member 10 is a rectangular structure. The first direction AA can be understood as the length direction of the support member 10, and the second direction BB can be understood as the width direction of the support member 10. The heat insulation member 20 and the support member 10 are assembled in a T shape, and a plurality of clamping portions 21 are arranged along the width direction of the support member 10 at the bottom where the heat insulation member 20 contacts the support member 10. In another embodiment, the first direction AA can also be understood as the width direction of the support member 10, and the second direction BB can be correspondingly understood as the length direction of the support member 10. Other structural features can refer to the same or similar principles and structures of the foregoing embodiments.

[0026] Please continue to refer to Figure 4 , in some embodiments, the heat insulation member 20 is provided with a clamping portion 21, and the support member 10 is provided with a clamping groove 11 adapted to the clamping portion 21. Among them, the clamping groove 11 is a dovetail groove, and the shape of the clamping portion 21 is adapted to the shape of the clamping groove 11. The dovetail groove has a pair of inclined sides, is wider at the bottom and narrower at the top. The setting of the dovetail groove allows a certain alignment tolerance, making the installation process simpler. And the dovetail groove can provide a reliable wedge locking mechanism, so that the heat insulation member 20 will not fall off easily when subjected to a lateral force after being inserted into the support member 10, and it is not easy to loosen even when subjected to vibration or external impact.

[0027] In some embodiments, the heat insulation member 20 is provided with a clamping portion 21, and the support member 10 is provided with a clamping groove 11 adapted to the clamping portion 21. Among them, the clamping groove 11 is a T-shaped groove, and the shape of the clamping portion 21 is adapted to the shape of the clamping groove 11. The setting of the T-shaped groove is simple, easy to machine, and has a low cost, providing a stable fixing method for the connection between the heat insulation member 20 and the support member 10, and facilitating the installation or disassembly of the heat insulation member 20, making the maintenance work more efficient.

[0028] Specifically, the support member 10 is a mica plate. The mica plate has a very high thermal resistance, can effectively prevent heat transfer, and prevent the high temperature at the bottom of the battery cell 210 from spreading to the housing of the energy storage device. The mica plate is also an electrical insulating material, which can prevent short circuits between the battery cell 210 and the housing. And the mica plate can be fixed to the contact surface of the battery cell 210 by gluing. Gluing can simplify the connection structure, without the need to use additional connecting parts, and the gluing material has a certain elasticity, which can absorb shock. The heat insulation member 20 is an aerogel heat insulation member 20, which can effectively prevent heat transfer between the battery cells 210, and the density of the aerogel is relatively low, and will not significantly increase the weight of the thermal management device 100. And the aerogel heat insulation member 20 has a certain flexibility, and when arranged between the battery cells 210, it can also play a buffering role when the battery cells 210 expand, preventing direct contact between the battery cells 210, integrating the effects of heat insulation and buffering.

[0029] As Figure 2 and Figure 3 shown, the heating assembly 30 includes a plurality of heating films 31 and a plurality of conductive connectors 32. The heating films 31 are used to heat the battery cells 210 and improve the performance of the battery cells 210 in a low-temperature environment. At least one heating film 31 is attached and connected to one side of the heat insulation member 20 facing the accommodation groove 100a, and can directly heat the battery cells 210. Since the heating film 31 can be in direct contact with the battery cells 210, the battery cells 210 can be heated more efficiently, and the performance of the battery cells 210 in a low-temperature environment can be improved. It should be noted that accommodation grooves 100a are formed on both sides of one heat insulation member 20. Therefore, the heating film 31 can be attached and connected to one side or both sides of the heat insulation member 20.

[0030] The conductive connecting member 32 is used to conduct current. Each conductive connecting member 32 is connected to two adjacent heating films 31. The two adjacent heating films 31 are connected in series through the conductive connecting member 32, so that current can flow between the two heating films 31. In this way, multiple heating films 31 are connected in series through multiple conductive connecting members 32. The multiple heating films 31 do not need to be connected in series using wire harness connectors, saving the number of connectors and reducing the production cost.

[0031] The series connection of multiple heating films 31 is achieved by setting multiple conductive connecting members 32. The series-connected heating films 31 can make multiple battery cells 210 heat more evenly during the heating process. Since the current in a series circuit is the same, the heating effect of each heating film 31 is relatively consistent, thereby reducing the problems of local overheating or uneven heating of the battery cells 210 at different positions. In a low-temperature environment, the series-connected heating films 31 can transfer heat more evenly, improving the starting and discharging performance of the battery and solving the problem of poor low-temperature heating performance in parallel connection. Moreover, the temperature difference between the battery cells 210 is effectively controlled, avoiding the large temperature difference between the battery cells 210 at different positions in parallel connection, thereby reducing the pressure difference between the battery cells 210. Reducing the pressure difference and temperature difference between the battery cells 210 helps to maintain the consistency of the battery cells 210, extend the cycle life of the battery module 1, and solve the problem that the cycle life of the battery module 1 may be shortened due to long-term use in parallel connection.

[0032] Specifically, for multiple heating films 31 connected in parallel, since the voltage of each heating film 31 is the same, the current will be distributed according to the resistance value of each heating film 31. The heating film 31 with a lower resistance value will pass more current. Due to differences in the manufacturing process, even heating films 31 of the same batch may have slightly different resistance values. In a parallel circuit, these small resistance differences will cause uneven current distribution, thereby affecting the heating effect of the heating film 31. This uneven current distribution will cause some heating films 31 to overheat while some heating films 31 are underheated.

[0033] Compared with multiple heating films 31 connected in series, the current of each heating film 31 is the same, and the voltage will be distributed according to the resistance value of each heating film 31. The heating film 31 with a higher resistance value will bear more voltage. The series-connected heating films 31 are consistent in terms of current, which means that each heating film 31 will pass the same current, helping to achieve a more uniform heating effect.

[0034] Furthermore, since multiple heating films 31 are connected in series, the control logic of the battery management system (BMS) can be simpler, reducing the complexity of the control circuit, the system cost, and the maintenance difficulty.

[0035] Please continue to refer toFigure 2 and Figure 3 In some embodiments, the heating component 30 may be a separate component. The heating film 31 is connected to the heat insulation member 20 by bonding, and can also be fixed to the battery cell 210 by bonding, so that the heat retention is evenly transferred to the battery cell 210, improving the heating efficiency. The bonding material has a certain elasticity and buffering effect, and can absorb part of the stress when the battery cell 210 expands or contracts, protecting the battery cell 210 and the heating film 31 from damage.

[0036] In some embodiments, two conductive connectors 32 connected to the same heating film 31 are located on both sides of the heating film 31 along the second direction BB, and the second direction BB is perpendicular to the first direction AA. If the conductive connectors 32 are arranged on the same side of the heating film 31 along the second direction BB, the current may choose the shortest path and directly flow from one conductive connector 32 to the other conductive connector 32 without passing through the heating film 31, resulting in a short circuit. Arranging the two conductive connectors 32 on both sides of a heating film 31 can ensure that the current must pass through each heating film 31, avoiding the situation where the current bypasses some heating films 31 and directly flows through the conductive connectors 32.

[0037] Please continue to refer to Figure 3 In some embodiments, the heating film 31 has two wide surfaces 311 arranged opposite to each other along the first direction AA and two narrow surfaces 312 arranged opposite to each other along the second direction BB, and the second direction BB is perpendicular to the first direction AA. The wide surfaces 311 of two adjacent heating films 31 are arranged opposite to each other, that is, the heating film 31 is in contact with the battery cell 210 through the wide surface 311. Especially when the battery cell 210 is a square battery cell 210, the larger side of the square battery cell 210 usually has a larger surface area. Arranging the heating film 31 on this side can provide a larger contact area, thereby improving the heating efficiency and uniformity.

[0038] And both ends of the conductive connector 32 are respectively connected to two narrow surfaces 312 on the same side of two adjacent heating films 31. The conductive connector 32 connected to the narrow surface 312 reduces the heat loss through the conductive connector 32 itself, because the area of the narrow surface 312 is smaller, and the heat conduction path is shorter and the heat loss is less compared to the wide surface 311. And connecting to the narrow surface 312 can simplify the assembly process of the heating film 31, because the layout of the narrow surface 312 is easier to align and fix.

[0039] Such as Figure 3As shown, in some embodiments, the heating component 30 further includes two conductive lead-out members 33. Along the first direction AA, one conductive lead-out member 33 is connected to a heating film 31 at the starting end, and the other conductive lead-out member 33 is connected to a heating film 31 at the ending end. The conductive lead-out members 33 are used to introduce an external power supply into the heating film 31, thereby forming a closed loop. The conductive lead-out members 33 provide convenient connection points, enabling the heating film 31 to be easily connected to an external circuit without complex wiring. Moreover, the current flowing through the heating film 31 can be conveniently controlled through the conductive lead-out members 33, effectively managing the temperature of the battery cell 210.

[0040] Among them, the conductive lead-out member 33 is in a sheet structure. The sheet structure helps to increase the heat dissipation area, thereby improving the heat dissipation performance of the conductive lead-out member 33 and reducing the risk of local overheating. And the material of the conductive lead-out member 33 is nickel or copper. Both nickel and copper are excellent conductive materials, which can provide current transmission with low resistance, reduce energy loss, and improve the heating efficiency.

[0041] In some embodiments, the conductive lead-out member 33 and the heating film 31 can be an integral component. The integral component simplifies the structure of the heating component 30 and reduces the complexity of assembly. The conductive lead-out member 33 is connected to a wide surface 311 of the heating film 31, and the conductive lead-out member 33 extends out of the outer edge of the wide surface 311 along the plane direction of the wide surface 311 or in a direction parallel to the wide surface 311, facilitating it to be used as a current input connection.

[0042] As Figure 2 shown, in some embodiments, when the heating film 31 of the heating component 30 is only arranged on one side of the heat insulation member 20, two sets of heating components 30 can be provided. The heating film 31 of one heating component 30 is arranged on one side of the heat insulation member 20, and the heating film 31 of the other heating component 30 is arranged on the other side of the same heat insulation member 20. Arranging heating films 31 on both sides can transfer heat to the battery cell 210 more quickly, improving the heating efficiency. Especially in a low-temperature environment, it helps to quickly increase the temperature of the battery cell 210 and improve the battery performance. It also helps to maintain the temperature consistency between the battery cells 210, contributing to improving the discharge performance and charging efficiency of the battery cells 210 and improving the overall performance of the battery cells 210. And setting two heating components 30 means having two sets of conductive lead-out members 33, which are independently controlled respectively, capable of providing greater flexibility and allowing different heating strategies to be adjusted according to the states of the battery cells 210 and environmental conditions.

[0043] It can be understood that, in some embodiments, only one set of heating components 30 can also be provided, and multiple heating films 31 of one set of heating components 30 cover the opposite sides of the heat insulation member 20 in a series connection manner. The present application does not limit this.

[0044] Please continue to refer to Figure 2, in some embodiments, the thermal management device 100 further includes two end plates 40 and a bundling member 50. The two end plates 40 are respectively connected to both sides of the support member 10 in the first direction AA. The whole formed by the plurality of heat insulation members 20 is located between the two end plates 40 and is fixed by the end plates 40 on the outside. Its function is to protect the plurality of battery cells 210 arranged side by side and protect the battery cells 210 from external impacts and pressures. The present application does not limit the material and shape of the end plates 40. The end plates 40 are usually metal end plates 40. Heat insulation members 20 may also be provided on the end plates 40 to prevent excessive heat dissipation of the battery cells 210 on both sides.

[0045] The bundling member 50 is sleeved on the outer periphery of the whole formed by the two end plates 40. The bundling member 50 is used to fix the battery cells 210, the two end plates 40, the plurality of heating films 31 and the plurality of heat insulation members 20 together. The bundling member 50 is used for bundling operations to make the plurality of battery cells 210, the two end plates 40, the plurality of heating films 31 and the plurality of heat insulation members 20 into a whole, ensuring correct alignment of each component and improving the accuracy of overall assembly.

[0046] As Figure 2 shown, wherein, the bundling member 50 includes a first strap 51 and a second strap 52. The first strap 51 and the second strap 52 are arranged at intervals along the height direction of the end plate 40, which helps to evenly distribute stress and avoid internal structure damage or structural failure caused by stress concentration. It can enhance the structural stability of the entire thermal management device 100, especially in the height direction, and helps to prevent deformation of the thermal management device 100 when subjected to external forces or internal expansion of the battery cells 210.

[0047] As Figure 1 and Figure 2 shown, in some embodiments, a battery module 1 is further provided, including a battery cell assembly 200 and the thermal management device 100 in any of the above embodiments; the battery cell assembly 200 can be used to provide power for external devices. The battery cell assembly 200 includes a plurality of battery cells 210. The battery cells 210 are used to store energy for subsequent use. One battery cell 210 can be arranged in one accommodation groove 100a. In a low-temperature environment, the thermal management device 100 can effectively provide uniform heat for the battery cells 210, help the battery module 1 quickly reach the ideal working temperature, and improve the starting performance. And the thermal management device 100 isolates the heat transfer between adjacent battery cells 210 and keeps the temperature difference between the battery cells 210 within a safe range.

[0048] In some embodiments, an energy storage device is further provided, which includes a housing, a control board, and the battery module 1 in any of the above embodiments. The battery module 1 is disposed inside the housing, and the housing provides physical protection for the battery module 1 and the control board to prevent damage to the internal components by the external environment. The control board is electrically connected to the battery module 1 and is used to control and manage the charging and discharging process of the battery module 1. The energy storage device can work stably under a wider range of environmental conditions. Whether in a high-temperature or low-temperature environment, it can maintain good performance, enhancing the adaptability of the energy storage device. The stability and reliability of the energy storage device are improved, enhancing the user experience.

[0049] In some embodiments, the thermal management device 100 and the battery cell assembly 200 can be protected as an integrated component when the battery module 1 is assembled in the energy storage device. The manufacturing process of the integrated component is more standardized, which helps to improve the consistency and quality control of the battery module 1.

[0050] In the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as implying or indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the description of the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0053] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0054] The above content is only the specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A thermal management device for a battery cell, characterized in that, The thermal management device includes: a support member; a plurality of heat insulation members connected to the support member, the plurality of heat insulation members being arranged at intervals along a first direction of the support member, and two adjacent heat insulation members and the support member enclosing a receiving groove for receiving the battery cell; and a heating assembly including a plurality of heating films and a plurality of conductive connectors, at least one of the heating films being adhesively connected to a side of one of the heat insulation members facing the receiving groove; each of the conductive connectors connecting two adjacent heating films thereof, so that the plurality of heating films are connected in series through the plurality of conductive connectors.

2. The thermal management device according to claim 1, wherein The two conductive connectors connected to the same heating film are located on two sides of the heating film along a second direction, and the second direction is perpendicular to the first direction.

3. The thermal management device according to claim 1, wherein The heating film has two wide faces arranged opposite to each other along the first direction and two narrow faces arranged opposite to each other along the second direction, the second direction being perpendicular to the first direction, and the wide faces of two adjacent heating films are arranged opposite to each other; Two ends of the conductive connector are respectively connected to two narrow faces on the same side of two adjacent heating films.

4. The thermal management device according to claim 3, wherein The heating assembly further includes: two conductive lead-out members, along the first direction, one of the conductive lead-out members is connected to one of the heating films at the starting end, and the other conductive lead-out member is connected to one of the heating films at the ending end.

5. The thermal management device according to claim 4, wherein The conductive lead-out member is connected to one of the wide faces of the heating film, and the conductive lead-out member extends out of the outer edge of the wide face along the plane direction of the wide face or a direction parallel to the wide face.

6. The thermal management device according to claim 1, characterized in that, At least one of a clamping portion and a clamping groove is provided at an end of the heat insulation member close to the support member, and at least the other of the clamping portion and the clamping groove is provided on the support member, and one clamping portion can be clamped with a corresponding clamping groove.

7. The thermal management device according to any one of claims 1-6, characterized in that, The support member is a mica plate; and / or, the heat insulation member is an aerogel heat insulation member.

8. The thermal management device according to any one of claims 1-6, characterized in that, The thermal management device further includes: two end plates respectively connected to two sides of the support member in the first direction, and the whole formed by the plurality of heat insulation members is located between the two end plates; and a bundling member sleeved on the outer periphery of the whole formed by the two end plates, and the bundling member is used to fix the battery cell, the two end plates, the plurality of heating films and the plurality of heat insulation members together.

9. A battery module, characterized in that, Including: the thermal management device according to any one of claims 1-8; and a battery cell assembly including a plurality of battery cells, and one battery cell is arranged in one receiving groove.

10. An energy storage device, characterized in that, Including: the battery module according to claim 9; a housing, and the battery module is arranged in the housing; a control board electrically connected to the battery module.

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