Battery modules, battery packs and electrical equipment

Abstract

The present application provides a battery module, a battery pack and an electrical device, which relate to the field of power battery technology. The battery module includes: a module box having a accommodating cavity, the lower end of which is provided with a plurality of openings; a wire harness isolation plate assembly, which is provided in the accommodating cavity, the wire harness isolation plate assembly is connected to the lower end of the accommodating cavity, and at least a part of the structure of the wire harness isolation plate assembly is exposed at the opening. An opening is provided at the lower end of the module box, and the wire harness isolation plate assembly is connected to the lower end of the module box to form a whole, so that when the battery cell is loaded into the accommodating cavity from the upper end of the module box, it can be welded to the wire harness isolation plate assembly at the lower end, thereby reducing the risk of high-voltage breakdown caused by welding slag falling into the interior of the module box under the action of gravity, thereby improving the safety of the product.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and more specifically, to a battery module, a battery pack, and an electrical device. Background Art

[0002] Under the pressure of energy crisis and environmental pollution, safety, environmental protection and energy conservation have become the themes of today's automobile development. Electric vehicles have received high attention from the transportation and energy departments due to their advantages of energy saving, environmental protection and pollution-free. In recent years, the new energy vehicle industry has ushered in explosive growth. Batteries, as the power core of electric vehicles, are a very important part of the entire electric vehicle. The battery system of an electric vehicle is often composed of hundreds or thousands of battery cells connected in series and parallel.

[0003] In the development of battery technology, in addition to improving the energy density of batteries, battery safety is also an issue that cannot be ignored. Therefore, how to improve battery safety is a technical problem that needs to be solved urgently in battery technology. Summary of the Invention

[0004] The purpose of this application is to provide a battery module, a battery pack and an electrical device that can reduce the risk of high-voltage breakdown caused by welding slag falling into the module box and improve product safety.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a battery module, comprising: a module box having a accommodating cavity, wherein the lower end of the accommodating cavity is provided with a plurality of openings; a wiring harness isolation plate assembly, which is arranged in the accommodating cavity, the wiring harness isolation plate assembly is connected to the lower end of the accommodating cavity, and at least a portion of the structure of the wiring harness isolation plate assembly is exposed at the opening.

[0007] In the above implementation process, an opening is provided at the lower end of the module box, and the wiring harness isolation plate assembly is connected to the lower end of the module box to form a whole, so that when the battery cell is loaded into the accommodating cavity from the upper end of the module box, it can be welded to the wiring harness isolation plate assembly at the lower end, reducing the risk of high-voltage breakdown caused by welding slag falling into the interior of the module box under the action of gravity, thereby improving the safety of the product.

[0008] In some embodiments, the wiring harness isolation plate assembly includes a bus, and a plurality of busbars are provided. Each busbar is provided with a base near the lower end of the accommodating cavity, and at least a portion of the base is structured at the opening.

[0009] In the above implementation process, a base is provided on the busbar, so that after the busbar is welded to the battery cell, the heat generated during the operation of the battery cell can be conducted through the basebar, providing a uniform and high-heat-capacity heat transfer path, reducing the thermal contact resistance, and greatly ensuring temperature control and temperature uniformity.

[0010] In some embodiments, an insulating film is provided on the outer edge of the base. The insulating film can ensure the insulation of the base while also conducting the heat generated by the battery cells to the liquid cooling plate to reduce thermal contact resistance and ensure temperature control and uniformity.

[0011] In some embodiments, the module box includes side panels, end panels, and a bottom panel, the side panels, end panels, and the bottom panel are integrally formed, and the bottom panel is provided with the opening.

[0012] In the above implementation process, the side panels, end panels and bottom panels are formed into a whole using one-piece molding technology, which can eliminate laser welding between the side panels, end panels and points, and can reduce the risk of high-voltage breakdown caused by welding slag falling into the accommodation cavity, thereby improving product safety.

[0013] In some embodiments, the battery module further includes a VC temperature averaging plate, and a plurality of VC temperature averaging plates are spaced apart along the left and right directions of the accommodating cavity to divide the accommodating cavity into a plurality of sub-accommodating cavities.

[0014] In the above implementation process, the VC temperature equalizer is set in the accommodating cavity, so that when the battery cell is assembled in the accommodating cavity, the VC temperature equalizer can realize internal circulation heat dissipation and temperature equalization, thereby dissipating heat from a large surface of the battery cell. At the same time, the VC temperature equalizer also has the functions of support, fireproof and heat insulation between battery cells, and buffering the aging and expansion space of battery cells, thereby improving the reliability and safety of the product, eliminating the insulation cotton, expansion cushion, etc. used in conventional assembly solutions, and achieving high integration.

[0015] In some embodiments, the front and rear ends of the VC temperature vapor chamber are both provided with extensions, and the side panels are provided with mounting grooves along the up and down directions, and the mounting grooves are configured to accommodate at least a portion of the extensions.

[0016] In the above implementation process, the side panel is provided with a mounting groove adapted to the extension of the VC temperature equalizing plate, which can facilitate the contact and fastening of the VC temperature equalizing plate and the large surface of the battery cell, ensuring the stability and consistency of the overall structure, and the VC temperature equalizing plate is easy to fix, thereby improving work efficiency.

[0017] In some embodiments, the battery module further includes a battery cell, which is disposed in the sub-accommodation cavity and is welded to the wiring harness isolation plate assembly.

[0018] In the above implementation process, since the battery cell is assembled in the accommodating cavity, the battery cell is welded to the speed limiting isolation plate assembly in an inverted manner, which can improve the space utilization in the battery pack layout. At the same time, due to the effect of gravity, the risk of high-voltage breakdown caused by welding slag falling into the module box can be reduced, thereby improving the safety of the product.

[0019] In some embodiments, the battery module further includes a liquid cooling plate, which is disposed below the module box and connected to the module box.

[0020] In the above implementation process, the liquid cooling plate is set under the module box, so that when the battery cell is working, part of its heat can be transferred to the insulating film through the base on the bus, and then exchange heat with the liquid cooling plate, and the other part of the heat is conducted through the VC temperature plate. These two paths provide a uniform, high-heat-capacity heat transfer path, reduce the thermal contact resistance, and greatly ensure temperature control and temperature uniformity.

[0021] In some embodiments, the battery module further includes a thermal pad disposed between the liquid cooling plate and the module case, and the thermal pad is configured to contact a structure of at least a portion of the wiring harness isolation plate assembly.

[0022] In a second aspect, the present application also provides a battery pack, characterized in that it includes a battery module as described in any one of the above items.

[0023] Since the battery pack provided in the second embodiment of the present application includes the battery module described in the second technical solution, it has all the technical effects of the above embodiments and will not be repeated here.

[0024] In a third aspect, the present application also provides an electrical device, characterized in that it includes the battery pack as described above.

[0025] Since the electrical equipment provided in the third embodiment of the present application includes the battery pack described in the second technical solution, it has all the technical effects of the above embodiments and will not be repeated here.

[0026] Other features and advantages of the present application will be described in the following description and, in part, will become apparent from the description or be understood by practicing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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. For ordinary technical users in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of a battery module disclosed in an embodiment of the present application.

[0029] Figure 2 This is a schematic diagram of the lower end structure of a module box of a battery module disclosed in an embodiment of the present application.

[0030] Figure 3 This is a partial structural diagram of a battery module disclosed in an embodiment of the present application.

[0031] Reference numerals

[0032] 100. Battery module; 101. Module case; 1011. End plate; 1012. Side plate; 10121. Mounting slot; 1013. Bottom plate; 102. Wire harness isolation plate assembly; 1021. Busbar; 1022. Base; 103. VC temperature plate; 104. Battery cell; 105. Liquid cooling plate; 106. Thermal pad. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application as claimed, but merely represents selected embodiments of the present application. All other embodiments derived by a user of ordinary skill in the art based on the embodiments in the present application without creative effort are also within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0038] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Users of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] Example

[0040] At present, based on the considerations of technology, process maturity and processing cost, mainstream new energy vehicles at home and abroad all adopt conventional module layout schemes. This layout scheme has the advantages of simple structure and high thermal management efficiency. Specifically: (1) In terms of structure, it is flat on the inner surface of the lower box assembly and the space under the bottom of the soft package module. The layout is relatively simple and adopts aluminum extrusion molding process. The technology and process are relatively mature and the production efficiency is high, which is conducive to large-scale batch production; (2) In terms of thermal management efficiency, the flatness can be precisely controlled within a certain length range, the contact area with the module surface is large, the thermal resistance is small, and the thermal management efficiency is improved. In addition, the flow channel contact area is large, which can effectively reduce the temperature difference between the upper and lower parts of the battery cell, and provide better protection for the battery during rapid charging and discharging and low-temperature preheating.

[0041] However, this conventional module layout also has the following drawbacks: 1. Difficulty controlling extrusion flatness: If the lower case is too long, a long harmonica tube is required. This is easily deformed, making flatness difficult to control, and the contact area with the module surface is small, resulting in high thermal resistance, which in turn affects thermal management efficiency. 2. Low integration: The liquid cooling plate is installed as a separate component inside the power battery pack, which takes up a lot of space and increases cost. The module's wiring harness isolation plate assembly is also assembled from multiple parts, including a busbar, FPC, and wiring harness isolation plate, which can easily lead to assembly quality issues and affect driving safety. 3. Low single-sided contact thermal management efficiency: The harmonica tube liquid cooling plate is laid flat on the inner surface of the lower case assembly and in the space below the bottom of the conventional module, contacting only one side of the battery cell. The limited contact area of ​​the liquid cooling plate limits its heat exchange capacity. Under combined operating conditions such as high-speed climbing and high-power fast charging, large temperature differences can result, affecting vehicle power and range. On the other hand, due to the structural layout and air cooling method, the overcurrent capacity of the battery cell copper busbar is also limited, and it cannot meet the 4C / 6C high-current operating conditions. If it encounters superimposed conditions such as high-speed climbing and high-power fast charging, it will cause an overtemperature alarm, which will affect the vehicle's power and cruising range, thereby reducing the product's competitiveness.

[0042] In view of this, if Figure 1-Figure 2 As shown, in the first aspect, the present application provides a battery module 100, comprising: a module box 101 and a wiring harness isolation plate assembly 102, wherein the wiring harness isolation plate assembly 102 is arranged inside the module box 101 and is located below the module box 101. When a battery cell 104 is assembled in the module box 101, the positive and negative poles of the battery cell 104 face downward and are welded to the wiring harness isolation plate assembly 102, which can reduce welding slag from falling into the interior of the module box 101, thereby improving the safety of the product.

[0043] Specifically, the module box 101 has a accommodating cavity with several openings at the lower end of the accommodating cavity; the wire harness isolation plate assembly 102 is arranged in the accommodating cavity, the wire harness isolation plate assembly 102 is connected to the lower end of the accommodating cavity, and at least a part of the structure of the wire harness isolation plate assembly 102 is exposed at the opening.

[0044] Exemplarily, the upper end of the module box 101 is configured to be open so that the battery cell 104 can be assembled in the accommodating cavity. The module box 101 and the wiring harness isolation plate assembly 102 can be formed using an integrated molding process, such as injection molding, so that the module box 101 and the wiring harness isolation plate form an integral structure, and then the battery cell 104 is assembled in the accommodating cavity, which can reduce the generation of welding slag and also reduce the amount of welding slag falling into the accommodating cavity.

[0045] In the above implementation process, an opening is provided at the lower end of the module box 101, and the wiring harness isolation plate assembly 102 is connected to the lower end of the module box 101 to form a whole, so that when the battery cell 104 is loaded into the accommodating cavity from the upper end of the module box 101, it can be welded to the wiring harness isolation plate assembly 102 at the lower end, reducing the risk of high-voltage breakdown caused by welding slag falling into the interior of the module box 101 under the action of gravity, thereby improving the safety of the product.

[0046] Please refer to Figure 2 The wiring harness isolation plate assembly 102 includes a bus 1021, and a plurality of busbars 1021 are provided. Each busbar 1021 is provided with a base 1022 near the lower end of the accommodating cavity, and at least a portion of the structure of the base 1022 is configured at the opening.

[0047] Exemplarily, the busbar 1021 can be formed into a finished product using a stamping process and then integrally formed with the module box 101, wherein the base 1022 can be configured to be cylindrical, etc., and the base 1022 can be knurled to improve fastening.

[0048] To ensure the heat dissipation effect, the flatness of the heat dissipation contact surface of the copper busbar heat conductive base 1022 and the liquid cooling plate 105 is controlled within 0.15mm; a certain number of limit grooves can be set on the heat dissipation contact surface of the liquid cooling plate 105 according to actual conditions to limit the deformation of the thermal pad 106 and ensure that the contact surface is tightly fitted to ensure the thermal management effect.

[0049] It can be understood that from the vehicle test data and simulation results, the bus 1021 connected to the positive and negative poles of the battery cell 104 has a relatively high temperature at its connection point. In order to better conduct the heat generated by it to the liquid cooling plate 105, the base 1022 can be set at the vertical center line of the connection point. Of course, it is not ruled out that the base 1022 can be set to deviate from the vertical center line of the connection point.

[0050] In the above implementation process, a base 1022 is provided on the bus 1021, so that after the bus 1021 is welded to the battery cell 104, the heat generated during the working process of the battery cell 104 can be conducted through the base 1022, providing a uniform and high heat capacity heat transfer path, reducing the thermal contact resistance, and greatly ensuring temperature control and temperature uniformity.

[0051] In some embodiments, an insulating film is provided on the outer edge of the base 1022. It is understood that the insulating film can be made of a polyurethane mixture, a polyimide film, or the like. The main performance parameters of the insulating film are: ① insulation strength ≥ 5.5KV / mil; ② tensile strength ≥ 140MPa; ③ thermal conductivity: ≥ 3W / (m·K); the thickness and depth of the insulating film are optimized based on the actual assembly effect and electrical performance simulation results. The insulating film can ensure the insulation of the base 1022 while also conducting the heat generated by the battery cells 104 to the liquid cooling plate 105, thereby reducing thermal contact resistance and ensuring temperature control and uniformity.

[0052] like Figure 2-Figure 3 As shown, the module box 101 includes side panels 1012, end panels 1011, and a bottom panel 1013. The side panels 1012, end panels 1011, and bottom panel 1013 are integrally formed, and the bottom panel 1013 is provided with the opening. Specifically, two side panels 1012 are provided, and the two side panels 1012 are spaced apart in the front-to-back direction. Two end panels 1011 are provided, and the two end panels 1011 are spaced apart in the left-to-right direction. The bottom panel 1013 is connected to the side panels 1012 and the end panels 1011, respectively, to form the accommodating cavity with the mounting opening facing upward. The mounting opening is used to assemble the battery cell 104 into the accommodating cavity.

[0053] In the above implementation process, the side panel 1012, the end panel 1011 and the bottom panel 1013 are formed into a whole by using one-piece molding technology, which can eliminate the laser welding between the side panel 1012, the end panel 1011 and the points, and can reduce the risk of high-voltage breakdown caused by welding slag falling into the accommodating cavity, thereby improving the safety of the product.

[0054] Please refer to Figure 3 The battery module 100 also includes a VC temperature averaging plate 103. Several VC temperature averaging plates 103 are spaced apart along the left and right sides of the accommodating cavity to divide the accommodating cavity into several sub-accommodating cavities. Specifically, the VC temperature averaging plates 103 are in contact with the large surface of the battery cell through thermal double-sided adhesive tape, which not only achieves thermal conductivity but also plays a fastening role. The thermal double-sided adhesive tape requires a thermal conductivity coefficient of ≥3W / (m·K), which solves the problems of difficult operation of thermal paste, uneven application, glue overflow, and other defective products that affect assembly efficiency, and has shockproof and shock-absorbing functions.

[0055] In the above implementation process, the VC temperature equalizing plate 103 is arranged in the accommodating cavity, so that when the battery cell 104 is assembled in the accommodating cavity, the VC temperature equalizing plate 103 can realize internal circulation heat dissipation and temperature equalization, thereby dissipating heat from a large surface of the battery cell 104. At the same time, the VC temperature equalizing plate 103 also has the functions of elasticity, support, fireproofing and heat insulation between the battery cells 104, and buffering the aging and expansion space of the battery cells 104, thereby improving the reliability and safety of the product, eliminating the insulation cotton, expansion cushion, etc. used in conventional assembly solutions, and achieving high integration.

[0056] In some embodiments, the front and rear ends of the VC temperature equalizing plate 103 are provided with extensions, and the side panel 1012 is provided with mounting grooves 10121 along the up and down directions. The mounting grooves 10121 are configured as a structure for accommodating at least a portion of the extensions, wherein the depth of the mounting grooves 10121 can be optimized and selected based on actual performance and assembly convenience.

[0057] In the above implementation process, the side panel 1012 is provided with a mounting groove 10121 adapted to the extension portion of the VC temperature equalizing plate 103, which facilitates the contact and fastening of the VC temperature equalizing plate 103 with the large surface of the battery cell 104, thereby ensuring the stability and consistency of the overall structure, and the VC temperature equalizing plate 103 is easy to fix, thereby improving work efficiency.

[0058] In some embodiments, the battery module 100 also includes a battery cell 104, which is arranged in the sub-accommodation cavity, and the battery cell 104 is welded to the wiring harness isolation plate assembly 102; it can be understood that the positive and negative poles of the battery cell 104 are arranged at the lower end. Since the battery cell 104 is assembled in the accommodation cavity, the battery cell 104 is welded to the speed limiting isolation plate assembly in an inverted manner, which can improve the space utilization in the battery pack layout. At the same time, due to the effect of gravity, the risk of high-voltage breakdown caused by welding slag falling into the module box 101 can be reduced, thereby improving the safety of the product.

[0059] In some embodiments, the battery module 100 further includes a liquid cooling plate 105 . The liquid cooling plate 105 is disposed below the module housing 101 and connected to the module housing 101 . Exemplarily, the liquid cooling plate 105 can be formed by extrusion molding or stamping and can be integrated as a part of the module box 101, wherein the water channel direction and water channel parameters (depth, width, length, etc.) of the liquid cooling plate 105 are selected and optimized and matched in combination with the actual assembly and heat dissipation simulation effects. An aluminum extrusion liquid cooling plate 105 solution can be adopted, or a stamping plate solution with dual parallel water channels or a double-layer liquid cooling plate 105 solution can be adopted. The opening modes of the water inlet and outlet of the liquid cooling plate 105 include a normal open mode and a Plus mode (i.e., flexible arrangement, relatively open). In combination with actual driving conditions, such as high-speed climbing, high-power fast charging, etc., the opening degree of the inlet and outlet pipes is adaptively adjusted according to the temperature of the battery, and the optimal thermal management control strategy is implemented to control the temperature difference of the battery pack within a reasonable range, so that the battery pack works within a reasonable temperature range all day long, ensuring the safety of battery use, thereby ensuring driving safety.

[0060] In the above implementation process, the liquid cooling plate 105 is arranged below the module box 101, so that when the battery cell 104 is working, part of its heat can be conducted to the insulating film through the base 1022 on the bus 1021, and then exchange heat with the liquid cooling plate 105, and the other part of the heat is conducted through the VC temperature plate 103. These two paths provide a uniform, high-heat-capacity heat transfer path, reduce the thermal contact resistance, and greatly ensure temperature control and temperature uniformity. The temperature difference of the battery pack can be accurately controlled from the original 15°C to 5°C, and accordingly, the life of the battery cell 104 is also extended by 10%.

[0061] In some embodiments, the battery module 100 further includes a thermal pad 106 disposed between the liquid cooling plate 105 and the module housing 101. The pad 106 is configured to contact at least a portion of the wiring harness isolation plate assembly 102. The pad 106 is insulating, with key performance parameters including density: 2.5 ≤ g / cm³; flame retardancy rating: V0; and thermal conductivity: ≥ 3 W / (m·K) @ compression 30% ± 5%, as per ASTM D5470. The thickness and size of the pad 106 are optimized based on actual assembly and heat dissipation simulation results.

[0062] In the second aspect, the present application also provides a battery pack, characterized in that it includes a battery module 100 as described in any one of the above items; because the battery pack provided in the embodiment of the second aspect of the present application includes the battery module 100 described in the technical solution of the second aspect, it has all the technical effects of the above embodiments and will not be repeated here.

[0063] On the third aspect, the present application also provides an electrical device, characterized in that it includes a battery pack as described above. The electrical device may be an electric toy, an electric tool, an electric vehicle, an electric car, a spacecraft, etc. When the electrical device is a vehicle, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head, or tail of the vehicle. The battery pack can be used to power the vehicle, for example, the battery pack can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery pack to power the motor, for example, for starting, navigating, and operating power requirements of the vehicle during driving.

[0064] Since the electrical equipment provided in the third embodiment of the present application includes the battery pack described in the second technical solution, it has all the technical effects of the above embodiments and will not be repeated here.

[0065] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for users skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery module, characterized in that: include: The module box has a receiving cavity, and a lower end of the receiving cavity is provided with a plurality of openings; A wire harness isolation plate assembly is arranged in the accommodating cavity, the wire harness isolation plate assembly is connected to the lower end of the accommodating cavity, and at least a part of the structure of the wire harness isolation plate assembly is exposed at the opening; the wire harness isolation plate assembly is connected to the lower end of the module box, so that when the battery cell is loaded into the accommodating cavity from the upper end of the module box, it can be welded to the wire harness isolation plate assembly at the lower end.

2. The battery module according to claim 1, wherein: The wiring harness isolation plate assembly includes a plurality of busbars, and each busbar is provided with a base near the lower end of the accommodating cavity, and at least a part of the structure of the base is configured at the opening.

3. The battery module according to claim 2, characterized in that: An insulating film is provided on the outer edge of the base.

4. The battery module according to claim 1, wherein: The module box includes side panels, end panels and a bottom panel. The side panels, end panels and the bottom panel are integrally formed, and the bottom panel is provided with the opening.

5. The battery module according to claim 4, characterized in that: The battery module further includes a VC temperature averaging plate, and a plurality of VC temperature averaging plates are arranged at intervals along the left and right directions of the accommodating cavity to divide the accommodating cavity into a plurality of sub-accommodating cavities.

6. The battery module according to claim 5, characterized in that: The front and rear ends of the VC temperature vapor chamber are both provided with extensions, and the side plates are provided with mounting grooves along the up and down directions, and the mounting grooves are configured to accommodate at least a portion of the extensions.

7. The battery module according to claim 5, characterized in that: The battery module further includes a battery cell, which is disposed in the sub-accommodation cavity and is welded to the wiring harness isolation plate assembly.

8. The battery module according to claim 1, wherein: The battery module further includes a liquid cooling plate, which is disposed below the module box and connected to the module box.

9. The battery module according to claim 8, characterized in that: The battery module further includes a thermal pad disposed between the liquid cooling plate and the module case, and the thermal pad is configured to contact a structure of at least a portion of the wiring harness isolation plate assembly.

10. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 10.

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