Battery cell module and energy storage equipment

Abstract

The utility model provides a battery cell module and energy storage equipment. The battery cell module is applied to the energy storage equipment. The battery cell module comprises a battery cell, a fixing assembly and a heating assembly. And a plurality of battery cells are provided. The fixing assembly is configured to restrain the relative positions of the at least two battery cells so that the battery cells can be relatively fixed. The heating assembly comprises a base plate, a heating piece and an elastic soaking piece. The substrate is configured to have a fixed positional relationship with respect to each of the cells. And the heating piece is arranged on one side, facing each battery cell, of the substrate. And the elastic soaking piece is positioned between the heating piece and each battery cell and is in heat conduction contact with the heating piece. And under the acting force of the substrate, the elastic soaking piece is in elastic contact with the surfaces of the same sides of the battery cells. According to the battery cell module and the energy storage equipment provided by the invention, the battery cells can be uniformly and stably heated.

Description

Technical Field

[0001] The present application relates to the field of mobile energy storage technology, and in particular to a battery cell module and an energy storage device. Background Art

[0002] When the energy storage device is in operation, the battery cells inside it need to be in a suitable operating temperature range, so the battery cells need to be heated at low temperatures. When heating the battery cells, it is necessary to ensure the uniformity of the temperature rise among multiple battery cells. If the temperature difference between different battery cells is too large, it may cause the battery cells to age and decay faster, overheat, or lithium deposition.

[0003] In the related technologies, some realize uniform heating by laying liquid flow belts between battery cells, but the cost is high and the application scenarios are mostly limited to cylindrical battery cells; others realize uniform heating by sticking heating plates on one side of each battery cell, but due to factors such as manufacturing tolerances of the battery cells and expansion of the battery cells during long-term use, it is easy for the heating plates to detach from some battery cells, causing the heating rate of the battery cell to be lower than that of other battery cells, resulting in excessive temperature differences between the battery cells. Utility Model Content

[0004] In view of this, the present application provides a battery cell module and an energy storage device that can heat the battery cell evenly and stably.

[0005] One embodiment of the present application provides a battery cell module for use in energy storage devices. The battery cell module includes a battery cell, a fixing assembly and a heating assembly. There are multiple battery cells. The fixing assembly is configured to constrain the relative positions of at least two battery cells so that each battery cell is relatively fixed. The heating assembly includes a substrate, a heating element and an elastic heat spreader. The substrate is configured to be fixed relative to the positional relationship of each battery cell. The heating element is disposed on one side of the substrate facing each battery cell. The elastic heat spreader is located between the heating element and each battery cell, and is in thermal contact with the heating element. Under the action of the substrate, the elastic heat spreader is in elastic contact with the same side surface of each battery cell.

[0006] In the above embodiment, the elastic heat spreader can transfer the heat released by the heating element to the battery cell, thereby heating the battery cell. The elastic heat spreader has a larger contact area with the battery cell than the heating element, so as to evenly transfer the heat to multiple battery cells. The substrate is relatively fixed to each battery cell, so that the substrate can continuously apply a force to the elastic heat spreader, and the elastic heat spreader can produce elastic deformation after being subjected to the force applied by the substrate. Regardless of whether the side of each battery cell facing the elastic heat spreader is flat, the elastic heat spreader can continuously and tightly fit with each battery cell through deformation, so as to stably transfer heat to each battery cell, thereby helping to reduce the temperature difference when each battery cell is heated. At the same time, each battery cell is constrained in relative position by a fixed component, so that each battery cell can stably bear the force applied by the elastic heat spreader, reduce the possibility of each battery cell being subjected to force and positional displacement, so as to maintain a close fit relationship between each battery cell and the elastic heat spreader. The present application is conducive to simplifying the structure required for uniform heating of the battery cell and reducing the cost required for uniform heating of the battery cell through the coordination of structures such as a fixed component, a substrate and an elastic heat spreader.

[0007] In some embodiments of the present application, the heating assembly further comprises a first insulating member, which is disposed between the heating member and the elastic heat-saturating member and covers the heating member.

[0008] In the above embodiment, the heating element is powered on to achieve heating, and the first insulating member is provided between the heating element and the elastic heat-spreading member to reduce the possibility of danger caused by leakage of the heating element, thereby improving the safety of the battery cell while stably heating the battery cell.

[0009] In some embodiments of the present application, the first insulating member is a PI film.

[0010] In the above embodiment, the PI film has good insulation performance and a high decomposition temperature, which can reduce the possibility of damage when transferring heat between the heating element and the elastic heat-spreading element, thereby maintaining insulation protection between the heating element and the elastic heat-spreading element.

[0011] In some embodiments of the present application, the heating assembly further comprises a first flame retardant adhesive. The first insulating member and the elastic heat spreading member are bonded to each other via the first flame retardant adhesive.

[0012] In the above embodiment, the elastic heat spreader is bonded to the first insulating member, and when the heating component and the battery cell are assembled, the two move together, which can simplify the assembly steps. The elastic heat spreader is relatively fixed to the first insulating member, which reduces the misalignment between the components inside the heating component when the heating component and the battery cell are assembled, which is conducive to reducing the assembly error. At the same time, whether the heating component side or the battery cell side is on fire, the first flame retardant glue can enhance the fire protection effect between the heating component and the battery cell, thereby improving the safety when heating the battery cell and when the battery cell is working.

[0013] In some embodiments of the present application, the heating element is welded to the substrate.

[0014] In the above embodiment, the heating element is fixed to the substrate by welding, and when the heating element and the battery cell are assembled, the two move together, which can simplify the assembly steps. In addition, the heating element and the substrate are relatively fixed, which reduces the misalignment between the components inside the heating element when the heating element and the battery cell are assembled, which is conducive to reducing assembly errors.

[0015] In some embodiments of the present application, the substrate is an epoxy board, the heating element is a resistance wire, and the heating element is etched on the substrate.

[0016] In the above embodiment, the epoxy board has a high structural strength, so as a substrate, it can apply sufficient force to the elastic heat spreader, and it is convenient to fix the resistance wire by etching, so that the relative position of the substrate and the heating element is stable, and it is helpful to reduce the thickness of the substrate and the heating element after being superimposed. At the same time, the resistance of the resistance wire changes linearly with the temperature, so as a heating element, it is easy to control the heating temperature, which is conducive to heating the battery cell to the required temperature quickly, stably and safely.

[0017] In some embodiments of the present application, the heating assembly further comprises a second flame retardant adhesive, and the heating element and the substrate are bonded together by the second flame retardant adhesive.

[0018] In the above embodiment, the heating element is bonded to the substrate, and when the heating component and the battery cell are assembled, the two move together, which can simplify the assembly steps. The heating element and the substrate are relatively fixed, which reduces the misalignment between the components inside the heating component when the heating component and the battery cell are assembled, which is beneficial to reduce assembly errors. At the same time, whether the battery cell or the heating element is on fire, the second flame retardant glue can enhance the fire protection effect between the heating element and the substrate, reduce the possibility of the fire spreading to other locations of the energy storage device, and help reduce the degree of danger when the energy storage device is out of control.

[0019] In some embodiments of the present application, the substrate is fixedly connected to the fixing assembly or to the housing of the energy storage device.

[0020] In the above embodiments, the position of the battery cell is fixed relative to the fixed component, or the position of the battery cell is fixed relative to the shell after the battery cell module is assembled to the shell, and the substrate is connected to the fixed component or the shell, so that the substrate can apply force to the elastic heat spreader with the support of the fixed component or the shell, thereby facilitating the elastic heat spreader to fit tightly against each battery cell.

[0021] In some embodiments of the present application, the fixing assembly includes an end plate and a hoop. Two end plates are provided and are arranged at intervals. At least the battery cell is arranged between the two end plates. The hoop is constructed to clamp the two end plates and each battery cell together. The substrate is fixedly connected to the two end plates.

[0022] In the above embodiment, the battery cells can be relatively fixed by providing the hoop bar. And by configuring two end plates, the pressure on the battery cells when the hoop bar tightens the battery cells can be reduced, and the connection with the substrate can be facilitated to avoid damaging the battery cells. At the same time, the end plates are fixed relative to the battery cells under the restriction of the hoop bar, so that the substrate and the battery cells are fixed, which facilitates the substrate to press the elastic heat spreader toward the battery cells.

[0023] In some embodiments of the present application, the battery module further includes an aerogel pad and a second insulating member. At least one aerogel pad is provided between each two adjacent battery cells. The second insulating member is a PI film. The second insulating member is wrapped around the outer side of the aerogel pad between each two adjacent battery cells by a packaging process without edge sealing.

[0024] In the above embodiment, the aerogel pad can prevent fire and heat, and reduce the possibility of a battery cell thermal runaway affecting other batteries. The aerogel pad is wrapped with a second insulating member to further enhance the fireproof and heat-insulating effect between two adjacent batteries. The PI film is packaged without edge sealing, which reduces the possibility of a battery cell on one side catching fire and directing the flame to other structures, thereby helping to reduce the final dangerous consequences or delay the occurrence of dangerous consequences.

[0025] An embodiment of the present application provides an energy storage device. The energy storage device includes a housing and a battery cell module as described in any of the above embodiments. The battery cell module is arranged in the housing.

[0026] In the above embodiments, the energy storage device is beneficial to reducing the temperature difference of heating the battery cells through the coordination of structures such as the fixing components, the substrate and the elastic heat spreader, which is beneficial to simplifying the structure required for uniform heating of the battery cells and reducing the cost required for uniform heating of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0028] Figure 1 A schematic diagram of the structure of an energy storage device is provided for an embodiment of the present application;

[0029] Figure 2 for Figure 1 Schematic diagram of the explosion of the energy storage device;

[0030] Figure 3 for Figure 2 Schematic diagram of the structure of the CEC core module;

[0031] Figure 4 for Figure 3 Schematic diagram of the explosion of the CEC core module;

[0032] Figure 5for Figure 3 Schematic cross-sectional view of the portion taken along section AA.

[0033] Main component symbols

[0034] 100-Battery cell module 200-Energy storage equipment

[0035] 10-battery core 20-fixing assembly 21-end plate

[0036] 22-hoop 30-heating component 31-substrate

[0037] 32-heating element 33-elastic heat-dissipating element 34-first insulating element

[0038] 40-cover plate 50-aerogel pad 60-second insulating member

[0039] 201-Shell DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] The terms “first”, “second”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0043] When the energy storage device is in operation, the battery cells inside it need to be in a suitable operating temperature range, so the battery cells need to be heated at low temperatures. When heating the battery cells, it is necessary to ensure the uniformity of the temperature rise among multiple battery cells. If the temperature difference between different battery cells is too large, it may cause the battery cells to age and decay faster, overheat, or lithium deposition.

[0044] In the related technologies, some realize uniform heating by laying liquid flow belts between battery cells, but the cost is high and the application scenarios are mostly limited to cylindrical battery cells; others realize uniform heating by sticking heating plates on one side of each battery cell, but due to factors such as manufacturing tolerances of the battery cells and expansion of the battery cells during long-term use, it is easy for the heating plates to detach from some battery cells, causing the heating rate of the battery cell to be lower than that of other battery cells, resulting in excessive temperature differences between the battery cells.

[0045] Embodiments of the present application provide a battery cell module and an energy storage device. The battery cell module is applied to an energy storage device. The battery cell module includes a battery cell, a fixing assembly and a heating assembly. The number of battery cells is multiple. The fixing assembly is configured to constrain the relative position of at least two battery cells so that each battery cell is relatively fixed. The heating assembly includes a substrate, a heating element and an elastic heat spreader. The substrate is configured to be fixed relative to the positional relationship of each battery cell. The heating element is disposed on one side of the substrate facing each battery cell. The elastic heat spreader is located between the heating element and each battery cell, and is in thermal contact with the heating element. Under the action of the substrate, the elastic heat spreader is in elastic contact with the same side surface of each battery cell.

[0046] The elastic heat spreader can transfer the heat released by the heating element to the battery cell, thereby heating the battery cell. The elastic heat spreader has a larger contact area with the battery cell than the heating element, so as to evenly transfer the heat to multiple battery cells. The substrate is relatively fixed to each battery cell, so that the substrate can continuously apply a force to the elastic heat spreader, and the elastic heat spreader can produce elastic deformation after being subjected to the force applied by the substrate. Regardless of whether the side of each battery cell facing the elastic heat spreader is flat, the elastic heat spreader can continuously and tightly fit with each battery cell through deformation, so as to stably transfer heat to each battery cell, thereby helping to reduce the temperature difference when each battery cell is heated. At the same time, each battery cell is constrained in relative position by a fixed component, so that each battery cell can stably bear the force applied by the elastic heat spreader, reduce the possibility of each battery cell being subjected to force and positional displacement, so as to maintain a close fit relationship between each battery cell and the elastic heat spreader. The present application is conducive to simplifying the structure required for uniform heating of the battery cell and reducing the cost required for uniform heating of the battery cell through the coordination of structures such as fixed components, substrates and elastic heat spreaders.

[0047] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other. Figure 5 In the figure, for the convenience of illustration, the structures of the first flame retardant adhesive and the second flame retardant adhesive are omitted, and the section lines of some structures are omitted.

[0048] See also Figure 1 One embodiment of the present application provides an energy storage device 200. The energy storage device 200 has the functions of storing and discharging electricity, and is used for home power backup, production unit power backup, outdoor work, outdoor entertainment, etc.

[0049] See also Figure 1 and Figure 2 In some embodiments, the energy storage device 200 includes a housing 201 and a battery module 100. The battery module 100 is disposed in the housing 201. The housing 201 is used to protect the battery module 100.

[0050] See also Figure 1 and Figure 2In some embodiments, the energy storage device 200 includes a power conversion module (not shown). The power conversion module is disposed in the housing 201. The housing 201 protects the power conversion module. The power conversion module is electrically connected to the battery module 100. The power conversion module is used to achieve AC / DC conversion control of the output current of the battery module 100. The energy storage device 200 provided with a power conversion module can be a small portable mobile power supply, a household energy storage power supply, an industrial and commercial energy storage power supply, or a container-type energy storage power supply.

[0051] See also Figure 1 and Figure 2 In some embodiments, the power conversion module can be omitted. The energy storage device 200 without the power conversion module can be used independently. The energy storage device 200 without the power conversion module can usually only output direct current. When the energy storage device 200 without the power conversion module is used independently, it can be used in coordination with the energy storage device 200 with the power conversion module as a power supply system that provides additional battery capacity.

[0052] See also Figure 2 and Figure 3 It is understandable that, in some embodiments, each energy storage device 200 is provided with a plurality of battery cell modules 100 .

[0053] See also Figures 3 to 5 In some embodiments, the battery cell module 100 includes a battery cell 10. There are multiple battery cells 10. As an illustrative example, the battery cell 10 can be cylindrical, rectangular, or other shapes.

[0054] See also Figure 5 It can be understood that in some embodiments, the plurality of battery cells 10 are arranged in a row along a certain direction. In other embodiments, the plurality of battery cells 10 are arranged in two rows, three rows or more rows along a certain direction.

[0055] See also Figure 3 and Figure 4 In some embodiments, the battery cell module 100 further includes a fixing assembly 20. The fixing assembly 20 is configured to constrain the relative positions of at least two battery cells 10 so that the battery cells 10 are relatively fixed.

[0056] See also Figure 3 and Figure 4 In some embodiments, the fixing assembly 20 includes an end plate 21 and a hoop 22. Two end plates 21 are provided and are spaced apart. At least the battery cell 10 is disposed between the two end plates 21. The hoop 22 is configured to clamp the two end plates 21 and each battery cell 10 together as a whole.

[0057] By providing the hoop bar 22 , each battery cell 10 can be relatively fixed. By configuring the two end plates 21 , the pressure on the battery cell 10 when the hoop bar 22 tightens the battery cell 10 can be reduced, and the connection with the substrate 31 can be facilitated to avoid damaging the battery cell 10 .

[0058] In other embodiments, the end plate 21 and the hoop bar 22 may be omitted, and the fixing assembly 20 has a plate-like structure and is provided with a slot, or the fixing assembly 20 is a part of the housing 201 and forms a slot. Each battery cell 10 is inserted into a different slot for relative fixation.

[0059] See also Figure 3 and Figure 4 It is understood that in some embodiments, a plurality of hoop bars 22 are provided to improve the stability of fixing each battery cell 10 .

[0060] It is understood that in some embodiments, each hoop bar 22 surrounds the entirety of the two end plates 21 and each battery cell 10. In other embodiments, both ends of each hoop bar 22 are connected to the two end plates 21, respectively.

[0061] Preferably, two hoop bars are provided, and the two hoop bars are respectively sleeved on the upper position and the lower position of the entire battery cell module 100 .

[0062] See also Figures 3 to 5 In some embodiments, the battery cell module 100 further includes a heating component 30 . The heating component 30 is used to heat the battery cell 10 .

[0063] It is understood that in some embodiments, the band 22 and the heating assembly 30 are respectively matched with the battery cell 10. That is, the band 22 does not clamp the heating assembly 30. In other embodiments, the band 22 is configured to clamp the heating assembly 30 together.

[0064] See also Figure 3 and Figure 4 In some embodiments, each battery module 100 is provided with a plurality of heating components 30. When the battery cells 10 are arranged in a longitudinal column along a certain direction, heating components 30 are provided on opposite sides of each column of battery cells 10.

[0065] See also Figure 3 and Figure 4 In some embodiments, the battery module 100 further includes a cover plate 40. When the battery cells 10 are arranged in a longitudinal column along a certain direction, each column of battery cells 10 is assembled to the housing 201, and the cover plate 40 is arranged on the side of each column of battery cells 10 away from the assembly surface of the housing 201. The heating assembly 30 and the cover plate 40 are located on different sides of each column of battery cells 10.

[0066] See also Figures 3 to 5In some embodiments, the heating assembly 30 includes a substrate 31, a heating element 32, and an elastic heat spreader 33. The substrate 31 is configured to be fixed in position relative to each battery cell 10. The heating element 32 is disposed on a side of the substrate 31 facing each battery cell 10. The elastic heat spreader 33 is located between the heating element 32 and each battery cell 10, and is in thermal contact with the heating element 32. Under the action of the substrate 31, the elastic heat spreader 33 is in elastic contact with the same side surface of each battery cell 10.

[0067] The force of the substrate 31 can be understood as follows: after the substrate 31 is fixed relative to each battery cell 10, under the constraint of the relatively fixed position, the substrate 31 has a tendency to move toward each battery cell 10, and the elastic heat spreader 33 is located between the substrate 31 and each battery cell 10, so the substrate 31 can apply a certain pressure to the elastic heat spreader 33. It can be understood that in some embodiments, the substrate 31 can cover the heating element 32 and the elastic heat spreader 33 along the direction toward the battery cell 10.

[0068] The elastic heat spreader 33 can transfer the heat released by the heating element 32 to the battery cell 10, thereby heating the battery cell 10. The elastic heat spreader 33 has a larger contact area with the battery cell 10 than the heating element 32, so as to evenly transfer the heat to multiple battery cells 10. The substrate 31 is relatively fixed to each battery cell 10, so that the substrate 31 can continuously apply a force to the elastic heat spreader 33, and the elastic heat spreader 33 can be elastically deformed after receiving the force applied by the substrate 31. Regardless of whether the side of each battery cell 10 facing the elastic heat spreader 33 is flat, the elastic heat spreader 33 can continuously and tightly fit with each battery cell 10 through deformation, so as to stably transfer heat to each battery cell 10, which is conducive to reducing the temperature difference when each battery cell 10 is heated. At the same time, the relative position of each battery cell 10 is constrained by the fixing assembly 20 so that each battery cell 10 can stably bear the force applied by the elastic heat spreader 33, reducing the possibility of position displacement of each battery cell 10 due to force, so as to maintain a close fit between each battery cell 10 and the elastic heat spreader 33.

[0069] See also Figures 3 to 5 In some embodiments, the substrate 31 is fixedly connected to the fixing assembly 20 or to the housing 201 (combined with the housing 201 of the energy storage device 200) Figure 2 as shown) fixed connection.

[0070] It is understood that in some embodiments, the substrate 31 is directly connected to the housing 201 of the energy storage device 200 , or is indirectly connected via a bracket (not shown) of the energy storage device 200 . The bracket of the energy storage device 200 is usually used to fix the limiting battery cell 10 .

[0071] The position of the battery cell 10 is fixed relative to the fixed component 20, or the position of the battery cell 10 is fixed relative to the shell 201 after the battery cell module 100 is assembled to the shell 201, and the substrate 31 is connected to the fixed component 20 or the shell 201, so that the substrate 31 can apply a force to the elastic heat spreader 33 with the support of the fixed component 20 or the shell 201, thereby facilitating the elastic heat spreader 33 to fit tightly with each battery cell 10.

[0072] See also Figures 3 to 5 In some embodiments, the substrate 31 is fixedly connected to the two end plates 21. The end plates 21 are fixed relative to each battery cell 10 under the restriction of the hoop bar 22, and the substrate 31 is fixedly connected to the end plates 21, so that the substrate 31 is fixed to each battery cell 10, which facilitates the substrate 31 to press the elastic heat spreader 33 toward the battery cell 10.

[0073] It can be understood that in some embodiments, the substrate 31 is fixed to the end plate 21 of the fixing assembly 20 by fasteners such as screws. Fasteners such as screws are used to improve the fixing stability between the substrate 31 and the end plate 21. In other embodiments, the substrate 31 can be fixed to the end plate 21 of the fixing assembly 20 by snap-fitting or plug-fitting. The snap-fitting or plug-fitting facilitates the disassembly and assembly of the substrate 31 and the end plate 21, which is helpful to simplify the assembly steps of the heating assembly 30 and facilitate the replacement or maintenance of the heating assembly 30.

[0074] See also Figures 3 to 5 In some embodiments, the elastic heat-dissipating member 33 is a thermally conductive silicone pad. The thermally conductive silicone pad has good thermal conductivity. On the one hand, it can transfer the heat emitted by the heating element 32 to each battery cell 10. On the other hand, it can increase the contact area with each battery cell 10 compared to the heating element 32, thereby improving the uniformity of heating. At the same time, the thermally conductive silicone pad has good elastic deformation ability. After being subjected to the force applied by the substrate 31, the thermally conductive silicone pad is easy to produce elastic deformation, thereby "filling" the gap between each battery cell 10, so as to achieve continuous adhesion with each battery cell 10.

[0075] See also Figures 3 to 5 In some embodiments, the heating assembly 30 further includes a first insulating member 34 (not shown). The first insulating member 34 is disposed between the heating member 32 and the elastic heat-saturating member 33. The first insulating member 34 covers the heating member 32.

[0076] The heating element 32 is energized to achieve heating, and the first insulating member 34 is provided between the heating element 32 and the elastic heat-spreading member 33 to reduce the possibility of danger caused by leakage of the heating element 32. Thus, the battery cell 10 is stably heated and the safety of the battery cell 10 is improved.

[0077] See also Figures 3 to 5In some embodiments, the first insulating member 34 is a PI film (Polyimide Film). The PI film can be used for a long time in the temperature range of -269°C to 280°C, and can reach a high temperature of 400°C for a short time, and the decomposition temperature generally exceeds 500°C. In addition, the dielectric constant of the PI film is less than 3.5. If fluorine atoms are introduced into the molecular chain, the dielectric constant can be reduced to about 2.5, and the dielectric loss is 10.

[0078] The PI film has good insulation performance and a high decomposition temperature, which can reduce the possibility of damage when transferring heat between the heating element 32 and the elastic heat-spreading element 33, thereby maintaining insulation protection between the heating element 32 and the elastic heat-spreading element 33.

[0079] See also Figures 3 to 5 In some embodiments, when the first insulating member 34 is a PI film, the first insulating member 34 encapsulates the heating member 32 on the substrate 31 .

[0080] On the one hand, the first insulating member 34, the heating member 32 and the substrate 31 can be relatively fixed, and on the other hand, the first insulating member 34 can be close to the heating member 32, thereby reducing the space occupied by the heating assembly 30. At the same time, through the packaging form, the air around the heating member 32 is reduced, thereby reducing the heat loss when the heating member 32 releases heat.

[0081] See also Figures 3 to 5 In some embodiments, the heating assembly 30 further includes a first flame retardant adhesive. The first insulating member 34 is bonded to the elastic heat spreader 33 by the first flame retardant adhesive. The first flame retardant adhesive can conduct heat, and the heating member 32 is indirectly in thermal contact with the elastic heat spreader 33 through the first flame retardant adhesive. It is understandable that in some embodiments, the first flame retardant adhesive is a double-sided adhesive with a good flame retardant effect.

[0082] The elastic heat spreader 33 is bonded to the first insulating member 34. When the heating component 30 and the battery cell 10 are assembled, the two move together, which can simplify the assembly steps. The elastic heat spreader 33 is relatively fixed to the first insulating member 34, which reduces the misalignment between the internal components of the heating component 30 when the heating component 30 and the battery cell 10 are assembled, which is conducive to reducing the assembly error. At the same time, whether the heating component 32 side or the battery cell 10 side is on fire, the first flame retardant glue can enhance the fire protection effect between the heating component 32 and the battery cell 10, thereby improving the safety when the battery cell 10 is heated and when the battery cell 10 is working.

[0083] In other embodiments, the first flame retardant adhesive may be omitted. The heating element 32 is in direct thermal contact with the elastic heat-dissipating element 33 .

[0084] See also Figures 3 to 5In some embodiments, the heating assembly 30 further includes a second flame retardant adhesive (not shown). The heating element 32 and the substrate 31 are bonded by the second flame retardant adhesive. It is understood that in some embodiments, the second flame retardant adhesive is a double-sided adhesive with good flame retardant effect.

[0085] The heating element 32 is bonded to the substrate 31. When the heating component 30 and the battery cell 10 are assembled, the two move together, which can simplify the assembly steps. The heating element 32 and the substrate 31 are relatively fixed, which reduces the misalignment between the internal components of the heating component 30 when the heating component 30 and the battery cell 10 are assembled, which is conducive to reducing assembly errors. At the same time, whether the battery cell 10 or the heating element 32 is on fire, the second flame retardant adhesive can enhance the fire protection effect between the heating element 32 and the substrate 31, reducing the spread of the fire to the energy storage device 200 (combined with Figure 2 The possibility of other positions (as shown) is helpful to reduce the danger level when the energy storage device 200 loses control.

[0086] See also Figures 3 to 5 In some embodiments, the second flame retardant adhesive may be omitted, and the heating element 32 may be welded to the substrate 31 .

[0087] The heating element 32 is fixed to the substrate 31 by welding, and when the heating assembly 30 and the battery cell 10 are assembled, the two move together, which can simplify the assembly steps. In addition, the heating element 32 and the substrate 31 are relatively fixed, which reduces the misalignment between the internal components of the heating assembly 30 when the heating assembly 30 and the battery cell 10 are assembled, which is conducive to reducing assembly errors.

[0088] See also Figures 3 to 5 In some embodiments, the substrate 31 is an epoxy board. The heating element 32 is a resistance wire. The heating element 32 is etched on the substrate 31. Etching is one of the specific forms of welding.

[0089] The epoxy board has a high structural strength, so as the substrate 31, it can apply sufficient force to the elastic heat-saturating member 33, and it is convenient to fix the resistance wire by etching, so that the relative position of the substrate 31 and the heating member 32 is stable, and it is helpful to reduce the thickness of the substrate 31 and the heating member 32 after being stacked. At the same time, the resistance of the resistance wire changes linearly with the temperature, so as the heating member 32, it is easy to control the heating temperature, which is conducive to heating the battery cell 10 to the required temperature quickly, stably and safely.

[0090] It can be understood that in some embodiments, the epoxy board can directly adopt a PCB (Printed Circuit Board) board equipped with some electrical components.

[0091] See also Figures 3 to 5 In some embodiments, the substrate 31 is a single-layer epoxy board. The resistance wire is located on a side of the substrate 31 facing the elastic heat spreader 33 .

[0092] In other embodiments, the substrate 31 is a double-layer epoxy board. The resistance wire is sandwiched between the two layers of boards. The first insulating member 34 can be omitted, and the elastic heat spreader 33 can be directly attached to one of the boards or attached to one of the boards through the first flame retardant adhesive.

[0093] See also Figures 3 to 5 In some embodiments, the battery cell module 100 further includes an aerogel pad 50 and a second insulating member 60. At least one aerogel pad 50 is provided between each two adjacent battery cells 10. The second insulating member 60 is a PI film. The second insulating member 60 is wrapped around the outside of the aerogel pad 50 between each two adjacent battery cells 10 by a non-edge-sealed packaging process. The non-edge-sealed packaging process refers to that after the PI film packaging includes the aerogel pad 50, the PI film has no convex edge extending in a direction perpendicular to the outer side of the aerogel pad 50, that is, between the aerogel pad 50 and the cover plate 40, the PI film has no convex edge extending toward the cover plate 40.

[0094] The aerogel pad 50 can prevent fire and heat, and reduce the possibility of a battery cell 10 thermal runaway affecting other battery cells 10. The aerogel pad 50 is wrapped with a second insulating member 60 to further improve the fireproof and heat-insulating effect between two adjacent battery cells 10. The PI film is packaged without edge sealing, which reduces the possibility of a battery cell 10 on one side catching fire and directing the flame to other structures, thereby helping to reduce the final dangerous consequences or delay the occurrence of dangerous consequences.

[0095] As an illustrative example, the cover plate 40 is located on the same side of each battery cell 10 and the aerogel pad 50, and there is a gap between each battery cell 10 and the aerogel pad 50 and the cover plate 40. If the PI film is packaged in the aerogel pad 50 by edge sealing, the convex edge formed by the edge sealing protrudes toward the cover plate 40, shortening the gap between the cover plate 40, and once a battery cell 10 catches fire, the flame will "climb" toward the cover plate 40 along the convex edge, thereby easily igniting the cover plate 40. If the PI film is packaged in the aerogel pad 50 without edge sealing, once a battery cell 10 catches fire, the flame has no fulcrum for "climbing" and cannot shorten the distance between the cover plate 40, thereby reducing the risk of igniting the cover plate 40.

[0096] The battery cell module 100 and energy storage device 200 of the present application are beneficial to reducing the temperature difference of heating the battery cell 10 through the coordination of structures such as the fixing component 20, the substrate 31 and the elastic heat spreader 33, which is beneficial to simplifying the structure required for uniform heating of the battery cell 10 and reducing the cost required for uniform heating of the battery cell 10.

[0097] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery cell module, applied to energy storage equipment, characterized in that: The battery module comprises: Battery cells, the number is at least two; A fixing assembly configured to constrain the relative positions of the battery cells so that the battery cells form a whole; The heating assembly comprises a substrate, a heating element and an elastic heat spreader, wherein the substrate is constructed to be fixed in position relative to each of the battery cells, the heating element is arranged on a side of the substrate facing each of the battery cells, the elastic heat spreader is located between the heating element and each of the battery cells and is in thermal contact with the heating element, and under the action of the substrate, the elastic heat spreader is in elastic contact with the same side surface of each of the battery cells.

2. The battery cell module according to claim 1, characterized in that: The heating assembly further includes a first insulating member, which is disposed between the heating member and the elastic heat-spreading member, and covers the heating member.

3. The battery cell module according to claim 2, characterized in that: The first insulating member is a PI film.

4. The battery cell module according to claim 2, characterized in that: The heating component further comprises a first flame retardant adhesive, and the first insulating member and the elastic heat spreading member are bonded to each other via the first flame retardant adhesive.

5. The battery cell module according to claim 4, characterized in that: The heating element is welded to the substrate; Alternatively, the heating assembly further includes a second flame retardant adhesive, and the heating element and the substrate are bonded to each other via the second flame retardant adhesive.

6. The battery cell module according to claim 1, characterized in that: The substrate is an epoxy board, the heating element is a resistance wire, and the heating element is etched on the substrate.

7. The battery cell module according to any one of claims 1 to 6, characterized in that: The substrate is fixedly connected to the fixing assembly or to a housing of the energy storage device.

8. The battery cell module according to any one of claims 1 to 6, characterized in that: The fixing assembly includes an end plate and a hoop bar, wherein two end plates are provided and are arranged at intervals, and at least two battery cells are arranged between the two end plates. The hoop bar is constructed to tighten the two end plates and each battery cell to form a whole, and the base plate is fixedly connected to the two end plates.

9. The battery cell module according to any one of claims 1 to 6, characterized in that: The battery cell module also includes an aerogel pad and a second insulating member. At least one aerogel pad is provided between each two adjacent battery cells. The second insulating member is a PI film. The second insulating member is wrapped around the outside of the aerogel pad between each two adjacent battery cells through a non-edge-sealed packaging process.

10. An energy storage device, characterized in that: It comprises a shell and the battery cell module according to any one of claims 1 to 9, wherein the battery cell module is arranged in the shell.

Images