Battery module and electric device

Abstract

The application discloses a battery module and a power utilization device, and belongs to the technical field of batteries. The battery module comprises a plurality of battery monomers, a busbar and an insulation assembly. The busbar is used for electrically connecting the plurality of battery monomers. The busbar has a side surface and a first surface facing away from the side of the battery monomers. The first surface is connected with the side surface. The insulation assembly is arranged on the first surface of the busbar. The insulation assembly comprises a phase change layer. The phase change layer is arranged on the first surface and / or the side surface of the busbar. In the application, the phase change layer is arranged on the surface of the busbar. When thermal runaway occurs, the phase change layer absorbs heat, melts and changes phase, adheres to the first surface and / or the side surface of the busbar, plays an insulating role and effectively reduces the risk of high-voltage short circuit.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery module and an electrical device. Background Technology

[0002] As a crucial direction for the future development of automobiles, the thermal runaway safety issue has become a bottleneck restricting the development of new energy vehicles.

[0003] To mitigate the risk of thermal runaway in battery modules and prevent heat propagation, thermal insulation materials are typically used on the battery modules for heat diffusion protection, and an insulating material is adhered to the surface of the busbars connecting the battery modules to prevent high-voltage short circuits. However, for individual cells experiencing thermal runaway within the battery module, internal ejected material and flame impacts can easily blow over the insulating material adhered to the busbar surface, leading to insulation failure and an extremely high risk of high-voltage short circuits.

[0004] Therefore, this application is submitted. Utility Model Content

[0005] The purpose of this application is to overcome the shortcomings of the existing technology and provide a battery module and power device that can effectively improve the stability and safety of the battery module in high-temperature environments and effectively reduce the risk of high-voltage short circuits.

[0006] To achieve the above objectives, in a first aspect of this application, a battery module is provided, comprising:

[0007] Multiple battery cells;

[0008] A busbar for electrically connecting a plurality of battery cells, the busbar having a side and a first surface facing away from the battery cells, the first surface being connected to the side.

[0009] An insulating component is disposed on the first surface of the busbar, the insulating component including a phase change layer disposed on the first surface and / or the side surface of the busbar.

[0010] In one embodiment, the insulating component further includes an insulating layer disposed on the side of the phase change layer opposite to the busbar.

[0011] In one embodiment, the insulating component further includes an insulating layer, at least a portion of the edges of which are covered by the phase change layer.

[0012] In one embodiment, the insulating component further includes an insulating layer disposed between the phase change layer and the busbar.

[0013] In one embodiment, the insulating component further includes an insulating layer, which is completely covered by the phase change layer.

[0014] In one embodiment, the edge of the phase change layer extends beyond the edge of the insulating layer.

[0015] In one embodiment, the thickness of the phase change layer is greater than the thickness of the insulating layer.

[0016] In one embodiment, an adhesive layer is further provided between the busbar and the insulating component.

[0017] In one embodiment, the edge of the insulating component extends beyond the edge of the busbar.

[0018] In one embodiment, the insulating component further includes an insulating layer comprising a main insulating layer and an end insulating layer disposed at the edge of the main insulating layer. The thickness of the main insulating layer is greater than the thickness of the end insulating layer. The end insulating layer has an upper surface, a side surface, and a lower surface. The side surface of the end insulating layer is connected to the upper surface and the lower surface. The phase change layer is disposed on the upper surface, the side surface, and the lower surface of the end insulating layer.

[0019] In one embodiment, the insulating component further includes an insulating layer comprising a main insulating layer and an end insulating layer disposed at the edge of the main insulating layer, the main insulating layer being located on the first surface, the end insulating layer having a second surface facing the battery cell, and the phase change layer being disposed on the second surface and covering the side of the busbar.

[0020] In one embodiment, the side surface of the busbar facing the insulating component is a roughened layer, or the side surface of the busbar facing the insulating component is provided with a groove.

[0021] In a second aspect, this application provides an electrical device that includes the battery module described above.

[0022] The beneficial effects of this application are as follows: The battery module includes multiple battery cells, a busbar, and an insulating component. The busbar is used to electrically connect multiple battery cells. The busbar has a side and a first surface on the side away from the battery cells. The first surface is connected to the side. The insulating component is disposed on the first surface of the busbar. The insulating component includes a phase change layer. This application provides a phase change layer on the surface and / or side of the busbar. When thermal runaway occurs, the phase change layer absorbs heat and melts (partially or completely melts) to undergo a phase change and adheres to the busbar, thus playing an insulating role. At the same time, during the phase change process, the phase change layer can decompose to form water of crystallization. The evaporation of the water of crystallization can achieve the effect of absorbing heat and diluting the generated oxygen, which has a certain flame retardant effect and effectively avoids the risk of high voltage short circuit. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a battery module according to an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the structure of a battery module according to another embodiment of this application.

[0025] Figure 3 This is a side view of an insulating component according to an embodiment of this application.

[0026] Figure 4 This is a side view of an insulating component according to another embodiment of this application.

[0027] Figure 5 This is a side view of an insulating component according to another embodiment of this application.

[0028] Figure 6 This is a schematic diagram of the structure of a battery module according to another embodiment of this application.

[0029] Figure 7 This is a side view of an insulating component according to another embodiment of this application.

[0030] Figure 8 This is a side view of an insulating component according to another embodiment of this application.

[0031] Figure 9 This is a side view of an insulating component according to another embodiment of this application.

[0032] Figure 10 This is a top view of the insulating component according to another embodiment of this application.

[0033] Figure 11 This is a side view of an insulating component according to another embodiment of this application.

[0034] Figure 12 This is a schematic diagram of the structure of a battery module according to another embodiment of this application.

[0035] Figure 13 This is a side view of an embodiment of the insulating component and adhesive layer of this application.

[0036] Figure 14 This is a schematic diagram of the structure of a battery module according to another embodiment of this application.

[0037] Figure 15 This is a side view of the insulating component and adhesive layer according to another embodiment of this application.

[0038] Figure 16 This is a top view of the bus structure of this application.

[0039] Figure 17This is a top view of another busbar structure in this application.

[0040] Figure 18 This is a cross-sectional structural diagram of an insulating component along the thickness direction according to another embodiment of this application.

[0041] Figure 19 This is a side view of a battery module according to another embodiment of this application.

[0042] Explanation of reference numerals in the attached drawings: 1. Battery cell; 2. Busbar; 21. Roughening layer; 42. Groove; 3. Insulating component; 31. Phase change layer; 311. Upper phase change layer; 312. Side phase change layer; 313. Lower phase change layer; 32. Insulating layer; 321. Main insulating layer; 322. End insulating layer; 4. Adhesive layer; 5. Terminal post. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0045] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] Please refer to Figure 1The embodiments of this application provide a battery module, which includes a plurality of battery cells 1, a busbar 2 and an insulating component 3. The busbar 2 is used to electrically connect the plurality of battery cells 1. The busbar has a side and a first surface opposite to the battery cells. The first surface is connected to the side. The insulating component 3 is disposed on the first surface of the busbar 2. The insulating component 3 includes a phase change layer 31. The phase change layer 31 is disposed on the first surface and / or the side of the busbar 2.

[0047] This application provides a phase change layer 31 on the first surface and / or side of the busbar 2. When the battery module is working normally, the heat absorption effect of the phase change layer 31 can reduce the heat transferred by the busbar 2, reduce the thermal spread of the battery module, and improve the stability and safety of the battery module in high-temperature environments. In the event of thermal runaway, the phase change layer 31 absorbs heat and melts (partially or completely melts) to undergo a phase change, adhering to the first surface and / or side of the busbar 2, thus playing an insulating role. At the same time, during the phase change process, the phase change layer 31 can decompose to form water of crystallization. The evaporation of the water of crystallization can achieve the effect of absorbing heat and diluting the generated oxygen, and has a certain flame retardant effect, effectively reducing the risk of high-voltage short circuit.

[0048] like Figures 2-3 As shown, in one embodiment, the insulating component 3 further includes an insulating layer 32, which is disposed on the side of the phase change layer 31 opposite to the busbar 2. This application provides a phase change layer 31 between the insulating layer 32 and the busbar 2. During normal operation of the battery module, the heat absorption of the phase change layer 31 reduces the heat transferred by the busbar 2, lowers the thermal spread of the battery module, and improves the stability and safety of the battery module under high-temperature conditions. The phase change layer 31 also enhances the bonding strength between the insulating layer 32 and the busbar 2. In the event of thermal runaway, the phase change layer 31 absorbs heat and melts (partially or completely), undergoing a phase change that adheres the insulating layer 32 to the busbar 2, thus fixing the insulating layer 32 and effectively reducing the risk of the insulating layer 32 being blown over by internal ejecta and flame impact. Simultaneously, during the phase change process, the phase change layer 31 decomposes to form water of crystallization. The evaporation of this water of crystallization absorbs heat and dilutes the generated oxygen, providing a certain flame-retardant effect. Even if the insulating layer 32 is blown over, the molten material produced by the heat absorption of the phase change layer 31 still provides insulation, effectively reducing the risk of high-voltage short circuits.

[0049] like Figures 4-5As shown, at least a portion of the edges of the insulating layer 32 are covered with the phase change layer 31. The insulating layer 32 may have the phase change layer 31 covered on one side, both sides, or all edges. By covering the edges of the insulating layer 32 with the phase change layer 31, when thermal runaway occurs, the phase change layer 31 absorbs heat and melts (partially or completely melts) to undergo a phase change. The phase change layer 31 covers the surface of the insulating layer 32, fixing the insulating layer 32 and effectively preventing internal ejected material and flame impact from blowing the insulating layer 32 over. Simultaneously, during the phase change process, the phase change layer 31 absorbs water of crystallization. The evaporation of this water of crystallization can absorb heat and dilute the generated oxygen, providing a certain flame-retardant effect. Furthermore, it can improve the adhesion between the insulating layer 32 and the phase change layer 31, further reducing the risk of the insulating layer 32 being blown over by airflow and effectively avoiding the risk of high-voltage short circuits.

[0050] like Figures 6-7 As shown, in one embodiment, the insulating layer 32 is disposed between the phase change layer 31 and the busbar 2. By disposing the insulating layer 32 between the phase change layer 31 and the busbar 2, the heat absorption effect of the phase change layer 31 can reduce the heat transferred by the busbar 2, thereby improving the stability and safety of the battery module under high-temperature conditions. In the event of thermal runaway, the phase change layer 31 absorbs heat and melts (partially or completely melts) to undergo a phase change, covering the surface of the insulating layer 32 and fixing the insulating layer 32. This effectively prevents the insulating layer 32 from being blown over by internal ejected materials and flame impacts. At the same time, during the phase change process, the phase change layer 31 can decompose to form crystal water. The evaporation of the crystal water can achieve the effects of heat absorption and dilution of the generated oxygen, thus having a certain flame-retardant effect and effectively avoiding the risk of high-voltage short circuit.

[0051] like Figures 8-9 As shown, in one embodiment, the phase change layer 31 is located on the side of the insulating layer 32 away from the busbar 2 and is located at least part of the edge of the insulating layer 32. The phase change layer 31 can cover the insulating layer 32 with one edge or both edges. With this configuration, when thermal runaway occurs, the phase change layer 31 absorbs heat and melts (partially or completely melts) to undergo a phase change, completely covering the surface of the insulating layer 32, which plays a role in fixing the insulating layer 32 and effectively prevents the insulating layer 32 from being blown over by the ejected material and flame impact inside the battery. At the same time, during the phase change process, the phase change layer 31 can absorb water of crystallization. The evaporation of the water of crystallization can achieve the effect of absorbing heat and diluting the generated oxygen, which has a certain flame-retardant effect and effectively avoids the risk of high-voltage short circuit.

[0052] like Figure 10As shown, in one embodiment, the insulating layer 32 is disposed between the phase change layer 31 and the busbar. The phase change layer 31 completely covers the edge of the insulating layer 32. When the battery module is working normally, the heat absorption effect of the phase change layer 31 can reduce the heat transferred by the busbar 2, reduce the heat spread of the battery module, and improve the stability and safety of the battery module in a high-temperature environment. In the event of thermal runaway, the phase change layer 31 absorbs heat and melts (partially or completely melts) to undergo a phase change, adhering the insulating layer 32 to the busbar 2, thus fixing the insulating layer 32. At the same time, it completely covers the edge of the insulating layer 32, absorbs heat and melts (partially or completely melts) to undergo a phase change, adhering the insulating layer 32 to the busbar 2, thus fixing the insulating layer 32, effectively reducing the risk of high-voltage short circuit.

[0053] like Figure 11 As shown, in one embodiment, the edge of the phase change layer 31 extends beyond the edge of the insulating layer 32. This arrangement reduces the risk of the edge of the insulating layer 32 being blown over by hot airflow.

[0054] In this embodiment, the thickness of the phase change layer 31 is greater than the thickness of the insulating layer 32. By controlling the thickness of the phase change layer 31 to be greater than the thickness of the insulating layer 32, the phase change layer 31 can further improve the bonding strength between the insulating layer 32 and the busbar 2, and can more effectively cover the insulating layer 32 when heated.

[0055] In this embodiment, the thickness ratio of the phase change layer 31 to the insulating layer 32 is 2 to 5, for example, it can be 2, 3, 4, 5 or any two of these values. This effectively utilizes the heat absorption and flame retardant properties of the phase change layer 31, enhancing its flame retardant performance. The bonding strength of the phase change layer 31 after melting and the area covering the insulating layer 32 also increase.

[0056] In this embodiment, the thickness of the insulating layer 32 is 0.2 to 0.8 mm, for example, it can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or any two of these values. By controlling the thickness of the insulating layer 32 within this range, while achieving its insulation and protection function, the space from the busbar 2 to the top cover of the battery module can be effectively increased, thereby increasing the exhaust channel of the battery module and facilitating the flow of flue gas to the pressure relief valve of the battery module for discharge.

[0057] In this embodiment, the thickness of the phase change layer 31 is 0.5–2 mm, for example, it can be 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, or any two of these values. By controlling the thickness of the phase change layer 31 within this range, while increasing the space between the busbar 2 and the battery module, the heat absorption, bonding, and flame retardant properties of the phase change layer 31 can be effectively utilized. During normal operation, it can effectively increase the heat absorption effect of the phase change layer 31 and slow down the heat transfer between the busbars 2. After thermal runaway of the battery module, the phase change melting effect of the phase change layer 31 can effectively cover the surface of the insulating layer 32, achieving insulation and flame retardant properties while also increasing the bonding effect between the phase change layer 31 and the insulating layer 32, preventing the insulating layer 32 from being blown over, thereby achieving a double insulation effect.

[0058] like Figures 12-15 As shown, in one embodiment, an adhesive layer 4 is further provided between the busbar 2 and the insulating component 3.

[0059] like Figures 12-13 As shown, the adhesive layer 4 is located between the phase change layer 31 and the busbar 2. By providing the adhesive layer 4 between the phase change layer 31 and the busbar 2, the adhesive layer 4 can bond the insulating component 3 to the busbar 2, making it fit tightly and preventing the insulating component 3 from moving, thus achieving the insulation function. At the same time, it also has a certain effect of preventing it from being blown over after thermal runaway.

[0060] like Figures 14-15 As shown, in one embodiment, the adhesive layer 4 is located between the insulating layer 32 and the busbar 2.

[0061] In this embodiment, the adhesion force between the phase change layer 31 and the insulating layer 32 is 0.5 to 0.7 N / mm, for example, it can be a range of 0.5 N / mm, 0.55 N / mm, 0.6 N / mm, 0.65 N / mm, 0.7 N / mm or any two of these values. By controlling the adhesion force between the phase change layer 31 and the insulating layer 32 to be within this range, there is sufficient adhesion between the phase change layer 31 and the insulating layer 32, which can effectively improve the structural stability and the impact resistance of the phase change layer 31 and the insulating layer 32.

[0062] The adhesion between the phase change layer 31 and the insulating layer 32 is tested using a peel strength tester. Specifically, the process is as follows: ① The sample is cut into 10cm × 0.3cm pieces; ② The 180° peel strength test is performed by clamping the sample at both ends; ③ The experiment is started, and after the experiment is completed, the instrument displays the average force value (in N); ④ The average force is divided by the width of the sample to obtain the adhesion force (N / mm).

[0063] In this embodiment, the thickness of the adhesive layer 4 is 0.005 to 0.1 mm, for example, it can be 0.005 mm, 0.008 mm, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm or any two of these values. By controlling the thickness of the adhesive layer 4 within this range, the bonding effect between the phase change layer 31 and the insulating layer 32 can be enhanced, preventing the insulating layer 32 from falling off and enhancing the overall impact resistance.

[0064] In this embodiment, the phase change temperature of the phase change layer 31 is 200-400℃, for example, it can be 200℃, 220℃, 240℃, 250℃, 280℃, 300℃, 320℃, 340℃, 350℃, 380℃, 400℃ or any two of these values. By controlling the temperature of the phase change layer 31 within this range, thermal runaway leads to the eruption of internal ejected material and flames. The temperature is usually greater than 300℃. As the reaction proceeds, the temperature will continue to rise and even reach 800℃. The phase change layer 31 melts and fixes the phase change material between the insulating layer 32 and the busbar 2, or completely covers the insulating layer 32. The phase change occurs through heat absorption and melting (partial or complete melting), adhering the insulating layer 32 to the busbar 2, which serves to fix the insulating layer 32 and effectively avoid the risk of high voltage short circuit.

[0065] In this embodiment, the insulating layer 32 includes at least one of mica tape and ceramic composite tape.

[0066] In this embodiment, the mica band includes mica minerals.

[0067] In this embodiment, the mica tape also includes resin.

[0068] In this embodiment, the ceramic composite belt includes at least one of ceramicized silicone rubber, ceramic fiber, glass fiber, and high-temperature resistant glass fiber cloth.

[0069] In this embodiment, the phase change layer 31 includes a phase change material, which includes at least one of boric acid, borax, and metal hydroxides Al(OH)3 and Mg(OH)2. Using such a phase change material, it can be effectively attached to or fixed on the insulating layer 32, effectively preventing the insulating layer 32 from being blown over by internal ejected materials and flame impacts, while also providing excellent flame retardant and insulating effects, effectively reducing the risk of high-voltage short circuits.

[0070] In this embodiment, the mass percentage of the phase change material in the phase change layer 31 is 60% to 100%, for example, it can be 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, or any two of these values.

[0071] In this embodiment, the phase change layer 31 further includes an adhesive, which includes at least one of epoxy resin, polyurethane adhesive, silicate adhesive, and polydopamine.

[0072] In this embodiment, the mass percentage of the adhesive in the phase change layer 31 is 0% to 40%, for example, it can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or any two of these values.

[0073] In this embodiment, more functions can be achieved by combining with other materials. For example, a flame retardant can be added to the phase change layer 31. The mass percentage of the flame retardant in the phase change layer 31 is controlled to be 0% to 20%, for example, it can be 0, 5%, 10%, 15%, 20% or any two of these values. Adding a flame retardant can further enhance its flame retardant effect and achieve its dual function of insulation and flame retardancy.

[0074] In this embodiment, the flame retardant includes at least one of ammonium bicarbonate, ammonium polyphosphate, and ammonium dihydrogen phosphate. By adding such a flame retardant to the phase change layer 31, the heat absorption strength of the phase change material and the volatilization of inert gas can be enhanced, thereby enhancing the flame retardant ability of the phase change layer 31 and preventing the thermal spread of the battery module.

[0075] In this embodiment, the adhesive layer 4 includes at least one of double-sided acrylic adhesive tape, rubber adhesive tape, silicone rubber adhesive tape, and polyester adhesive tape.

[0076] In this embodiment, as Figure 16 The surface of the busbar 2 facing the insulating component 3 is a roughened layer 21. This roughened layer 21 is formed by roughening the surface of the busbar 2. The roughened layer 21 improves the bonding strength between the insulating component 3 and the busbar 2, helps the molten material generated by the high-temperature reaction (such as the glassy substance formed by the melting of zinc borate) to adhere tightly to the surface of the busbar 2, helps retain the molten phase change material, and reduces the amount of molten material carried away by the hot air flow. The roughening treatment includes treating the surface of the busbar 2 using mechanical or chemical methods (mechanical wear or chemical corrosion) to obtain a micro-rough structure on the surface of the busbar 2.

[0077] In one embodiment, such as Figure 17The busbar 2 has multiple grooves 22 on the side surface facing the insulating component 3. The grooves 22 are provided to prepare the phase change material into a slurry with a certain fluidity. The phase change layer 31 is applied to the surface of the busbar 2 by coating and dried to form the phase change layer 31. This increases the adhesion between the phase change layer 31 and the surface of the busbar 2, so that the melt generated by the subsequent phase change adheres tightly to the surface of the busbar 2.

[0078] In one embodiment, a plurality of the grooves 22 are arranged in parallel.

[0079] In one embodiment, such as Figure 18 As shown, the insulating layer 32 includes a main insulating layer 321 and an end insulating layer 322 disposed at the edge of the main insulating layer 321. The end insulating layer 322 is covered by a phase change layer 31. The thickness of the main insulating layer 321 is greater than the thickness of the end insulating layer 322. For example, in one embodiment, the upper surface, side edge, and lower surface of the end insulating layer 322 are respectively provided with an upper phase change layer 311, a side phase change layer 312, and a lower phase change layer 313. In this way, by using the phase change layer 31 to cover the edge of the insulating layer 32, it is helpful that during the heating process of the battery module, the phase change layer 31 melts and connects the edge of the insulating layer 32 to the busbar 2, further reducing the risk of the edge of the insulating layer 32 being blown over by the airflow, and effectively avoiding the risk of high voltage short circuit. Moreover, the thickness of the main insulating layer 321 is greater than the thickness of the end insulating layer 322, so that after the phase change layer 31 is provided on the end insulating layer 322, the thickness of the entire insulating part can be kept consistent, which helps to cover the entire insulating assembly on the busbar 2.

[0080] In one embodiment, such as Figure 19 As shown, the insulating component 3 further includes an insulating layer 32, which comprises a main insulating layer 321 and an end insulating layer 322 disposed at the edge of the main insulating layer 321. The main insulating layer 321 is located on the first surface of the busbar 2, and the end insulating layer 322 has a second surface facing the battery cell. The phase change layer 31 is disposed on the second surface and covers the side of the busbar. This configuration, with the insulating layer 32 and the phase change layer 31 covering the first surface and side of the busbar 2, and the phase change layer 31 located on the side of the busbar, with one part connected to the insulating layer 32 and the other part connected to the busbar, improves the connection strength. During thermal runaway of the battery module, this helps to enhance the robust connection of the insulating component 3 to the busbar.

[0081] In one embodiment, the edge of the insulating component extends beyond the edge of the busbar, such as Figure 19 As shown, the edge of the insulating component extends beyond the edge of the busbar, which helps the insulating component to completely cover the busbar and improve the insulation performance of the busbar.

[0082] In one embodiment, this application provides an electrical device including the battery module described above.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A battery module, characterized in that, include: Multiple battery cells; A busbar for electrically connecting a plurality of battery cells, the busbar having a side and a first surface facing away from the battery cells, the first surface being connected to the side. An insulating component is disposed on the first surface of the busbar, the insulating component including a phase change layer disposed on the first surface and / or the side surface of the busbar.

2. The battery module according to claim 1, characterized in that, The insulating component further includes an insulating layer disposed on the side of the phase change layer opposite to the busbar.

3. The battery module according to claim 1, characterized in that, The insulating component further includes an insulating layer, at least a portion of the edges of which are covered by the phase change layer.

4. The battery module according to claim 1, characterized in that, The insulating component further includes an insulating layer disposed between the phase change layer and the busbar.

5. The battery module according to claim 1, characterized in that, The insulating component further includes an insulating layer, which is completely covered by the phase change layer.

6. The battery module according to claim 5, characterized in that, The edge of the phase change layer extends beyond the edge of the insulating layer.

7. The battery module according to claim 1, characterized in that, The insulating component further includes an insulating layer, which includes a main insulating layer and an end insulating layer disposed at the edge of the main insulating layer. The thickness of the main insulating layer is greater than the thickness of the end insulating layer. The end insulating layer has an upper surface, a side surface, and a lower surface. The side surface of the end insulating layer is connected to the upper surface and the lower surface. The phase change layer is disposed on the upper surface, side surface, and lower surface of the end insulating layer.

8. The battery module according to claim 1, characterized in that, The insulating component further includes an insulating layer comprising a main insulating layer and an end insulating layer disposed at the edge of the main insulating layer. The main insulating layer is located on the first surface, and the end insulating layer has a second surface facing the battery cell. The phase change layer is disposed on the second surface and covers the side of the busbar.

9. The battery module according to any one of claims 2 to 8, characterized in that, It satisfies any of the following conditions: A. The thickness of the phase change layer is greater than the thickness of the insulating layer; B. An adhesive layer is further provided between the busbar and the insulating component; C. The surface of the busbar facing the insulating component is a roughened layer; D. The busbar has a groove on the side surface facing the insulating component; E. The edge of the insulating component extends beyond the edge of the busbar.

10. An electrical appliance, characterized in that, The electrical device includes the battery module as described in any one of claims 1 to 9.

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