Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, and relates to the technical field of batteries, the battery pack is provided with a top heating assembly on the top surface of a battery cell unit so as to heat the top of the battery cell unit, and is provided with a bottom heating assembly on the bottom surface of the battery cell unit so as to heat the bottom surface of the battery cell unit; if the battery cell unit comprises at least two layers of stacked battery cell components, one middle heating component is arranged between every two layers, so that two surfaces of each battery cell component in the battery cell unit in the stacking direction can be heated, and the heating uniformity of each battery cell component can be realized; and the heating uniformity of the battery cell unit is improved, so that the heating uniformity of the battery pack is improved, and the thermal management capability and the working stability of the battery pack are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] The battery's thermal management system is one of the important means to maintain the battery's working condition. The battery needs to be heated and cooled accordingly in different usage environments to ensure the battery's working stability.

[0003] In the related art, a heating layer and a cold plate are provided on each battery module in a battery pack to achieve thermal management of the battery module, wherein the heating layer is used to heat the battery module, and the cold plate is used to dissipate heat and cool the battery module.

[0004] However, the heating uniformity of the battery module in the above-mentioned related art is poor, resulting in poor thermal management capability of the battery pack, which affects the performance and working stability of the battery pack. Utility Model Content

[0005] The embodiments of the present application provide a battery pack and an electrical device for solving the technical problem in the above-mentioned related technologies that the heating uniformity of the battery module is poor, resulting in poor thermal management capability of the battery, and affecting the performance and working stability of the battery.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery pack, comprising: a battery cell unit, wherein the battery cell unit comprises at least two layers of stacked battery cell assemblies, and in the stacking direction of the battery cell assemblies, the two surfaces of the two outermost battery cell assemblies that are away from each other are the top and bottom surfaces of the battery cell unit; a top heating assembly, wherein the top heating assembly is located on the top surface of the battery cell unit; a bottom heating assembly, wherein the bottom heating assembly is located on the bottom surface of the battery cell unit; and a middle heating assembly, wherein the middle heating assembly is provided between at least two adjacent layers of the battery cell assemblies, and the middle heating assembly is used to heat the two adjacent layers of the battery cell assemblies.

[0008] An embodiment of the present application provides a battery pack, which heats the top of the battery cell unit by arranging a top heating component on the top surface of the battery cell unit, and heats the bottom surface of the battery cell unit by arranging a bottom heating component on the bottom surface of the battery cell unit. Furthermore, if the battery cell unit includes at least two layers of stacked battery cell components, a middle heating component is arranged between each two layers to ensure that both surfaces of each battery cell component in the stacking direction in the battery cell unit can be heated, thereby achieving uniform heating of each battery cell component, improving the uniformity of heating of the battery cell unit, and further improving the uniformity of heating of the battery pack, as well as improving the thermal management capability of the battery pack and the operating stability of the battery pack.

[0009] Based on the above technical solution, this application can also be improved as follows.

[0010] In a possible implementation, a cold plate is further included. The cold plate is provided between any two adjacent layers of the battery core assemblies. The cold plate is stacked with the middle heating assembly, and the middle heating assembly faces the bottom heating assembly.

[0011] In this way, by placing a cold plate between any two adjacent layers of cell assemblies, it is possible to cool and dissipate heat from each cell assembly within the cell unit, thereby improving the cooling capacity of the cell unit. Furthermore, by placing the intermediate heating assembly on the cold plate, the versatility of the cold plate can be achieved, and the use of other connection structures for installing the intermediate heating assembly can be avoided, thereby improving the structural compactness of the cell assemblies within the cell unit.

[0012] In addition, the cold plate can also be used to support the battery cell components located above the cold plate, avoiding the use of additional supporting structures to support the battery cell components, which can further improve the structural compactness between the battery cell components in the battery cell unit, and can reduce the overall volume of the battery cell unit and reduce the space occupied by the battery cell unit.

[0013] In a possible implementation, the top heating assembly, the bottom heating assembly, and the middle heating assembly all include heating films, and the orthographic projection of each heating film toward the battery core assembly fully covers the outer contour of the battery core assembly.

[0014] In this way, the top heating component, the bottom heating component and the middle heating component all use heating films, which can reduce the overall height of the battery cell unit in the stacking direction, thereby reducing the space occupancy of the combined structure of the battery cell unit and each heating component.

[0015] Furthermore, by making the heating film fully cover the outer contour of the battery cell assembly with its positive projection toward the battery cell assembly, the heating film can fully cover the surface of each battery cell assembly in the stacking direction, thereby improving the uniformity of heating of the battery cell assembly by each heating assembly, and further improving the uniformity of heating of the battery cell unit by each heating assembly.

[0016] In a possible implementation, the heating film is divided into a plurality of heating zones, and at least some of the heating zones have different power densities.

[0017] In this way, by dividing each heating film into multiple heating zones and making the power density of at least some of the heating zones different, targeted heating can be performed according to the heating temperature requirements of different areas on the battery cell assembly, thereby further improving the heating uniformity of the battery cell assembly and the heating uniformity of the battery.

[0018] In a possible implementation, the top heating component, the middle heating component, and the bottom heating component are electrically connected in series in sequence.

[0019] In this way, by electrically connecting the top heating component, the middle heating component, and the bottom heating component in series in sequence to form a current path, compared to the method of heating each heating component separately, the number of joints on each heating component can be reduced, thereby reducing the manufacturing cost of each heating component and the manufacturing cost of the battery.

[0020] In one possible implementation, the top heating assembly has a first top joint and a second top joint; the middle heating assembly has a first middle joint and a second middle joint; the bottom heating assembly has a bottom joint; the first top joint is used to be electrically connected to a power supply, the second top joint is electrically connected to the first middle joint, and the second middle joint is electrically connected to the bottom joint.

[0021] In this way, the top heating component, the middle heating component and the bottom heating component are connected through the first top joint, the second top joint, the first middle joint and the second middle joint, and the first top joint is provided to be electrically connected to the power supply, so that the top heating component, the middle heating component and the bottom heating component can be heated at the same time while using one joint to be electrically connected to the power supply, thereby improving the heating efficiency and simplifying the connection method and heating method between the top heating component, the middle heating component and the bottom heating component.

[0022] In a possible implementation, each layer of the battery cell components has multiple groups arranged side by side; the heating film includes a plurality of connected heating film sheets, and each heating film sheet is opposite to one of the battery cell components.

[0023] In this way, by making each heating film correspond to a battery core assembly, each battery core assembly in the same layer can be heated and the temperature adjusted, thereby improving the heating uniformity of the battery core assembly.

[0024] In a possible implementation, the heating film further has a welding area, and the welding area is located at the outer edge of the heating film.

[0025] In this way, since the structure of the welding area (for example, the welding point formed for connection with the joint, etc.) has a certain thickness in the thickness direction of the heating film, by setting the welding area at the outer edge of the heating film, the heating film and the battery cell assembly or liquid cooling plate can be made to fit more closely, and the heating film can be prevented from being damaged by the structure of the welding area in its thickness direction, thereby improving the safety of the heating film.

[0026] In a possible implementation, the top heating assembly further includes a vapor chamber, and the heating film is attached to a side of the vapor chamber facing the battery cell assembly.

[0027] In this way, by arranging a heat spreader on the top heating assembly, the heat spreader can disperse the heat generated by the heating film of the top heating assembly when it is working more evenly, thereby improving the heating uniformity of the top heating assembly on the top surface of the battery cell unit.

[0028] In a possible implementation, a crossbeam assembly is further included, and the crossbeam assembly is used to support and fix the battery cell unit.

[0029] In this way, by setting up a crossbeam assembly and supporting and fixing the battery cell unit through the crossbeam assembly, the structural stability of the battery cell unit can be improved, and the probability of the battery cell assembly in the battery cell unit shaking or offsetting can be reduced, thereby improving the structural stability and working stability of the battery pack.

[0030] In one possible implementation, the battery cell unit includes a first battery cell assembly and a second battery cell assembly arranged in a stacked manner, and the second battery cell assembly is located relatively above the first battery cell assembly; the top heating assembly is located on the top surface of the second battery cell assembly, the bottom heating assembly is located on the bottom surface of the first battery cell assembly, and the middle heating assembly is arranged between the first battery cell assembly and the second battery cell assembly.

[0031] In this way, by setting the top heating component on the top surface of the second battery cell component, the bottom heating component is located on the bottom surface of the first battery cell component, and the middle heating component is located between the first battery cell component and the second battery cell component, both surfaces of the first battery cell component and the second battery cell component in the thickness direction can be heated, thereby achieving uniform heating of the first battery cell component and the second battery cell component.

[0032] In one possible implementation, the beam assembly includes multiple first beams and multiple second beams; the multiple first beams are arranged at intervals along the first direction, the first battery cell assembly is arranged between two adjacent first beams, and the multiple first beams are reused to support the second battery cell assembly; the second beams are connected to the first beams one by one, and the second battery cell assembly is arranged between the two connected second beams.

[0033] In this way, by positioning the first battery cell assembly between two adjacent first beams in the first direction, the first battery cell assembly can be fixed in position in the first direction. Similarly, by positioning the second battery cell assembly between two adjacent second beams in the first direction, the second battery cell assembly can be fixed in position in the first direction, thereby improving the structural stability of the second battery cell assembly.

[0034] In one possible implementation, the battery pack further includes a cold plate, which is arranged between the first battery cell assembly and the second battery cell assembly, and the intermediate heating assembly is arranged on the side of the cold plate facing the first battery cell assembly; the first crossbeam is connected to the cold plate and is used to support the second battery cell assembly on the cold plate.

[0035] In this way, the first battery cell assembly and the second battery cell assembly can be cooled and dissipated separately by one cold plate, thereby improving the uniformity of heat dissipation of the first battery cell assembly and the second battery cell assembly and reducing the manufacturing cost of the battery pack.

[0036] Furthermore, the first crossbeam is connected to the cold plate to support and fix the second battery cell assembly located above the cold plate, thereby enriching the function of the cold plate and reducing the spacing distance between the first battery cell assembly and the second battery cell assembly in the thickness direction, thereby reducing the space occupancy rate of the battery cell unit.

[0037] In addition, by arranging the middle heating assembly on the side of the cold plate facing the first battery cell assembly, it is possible to avoid the need for an additional structure for installing and fixing the middle heating assembly, thereby reducing the manufacturing cost of the battery pack and improving the structural compactness between the battery cell assemblies in the battery cell unit.

[0038] The second crossbeam is connected to the first crossbeam, and the first crossbeam and the second crossbeam clamp the cold plate.

[0039] In this way, by positioning part of the cold plate between the first crossbeam and the second crossbeam, and connecting the first crossbeam and the second crossbeam through the cold plate, the cold plate can be clamped by the first crossbeam and the second crossbeam, thereby improving the connection stability between the cold plate and the crossbeam assembly, thereby improving the support stability of the crossbeam assembly for the battery cell unit.

[0040] In a possible implementation, it further includes a tray and a sealing cover; the tray has a mounting groove, the battery cell unit is arranged in the mounting groove, and the bottom heating assembly is located between the battery cell unit and the bottom wall of the mounting groove; the sealing cover is arranged on the top surface of the battery cell unit and is connected to the tray, and the top heating assembly is arranged between the sealing cover and the battery cell unit.

[0041] In this way, by setting up a tray and a sealing cover, and setting the battery cell units and each heating component in the tray, the battery cell units and each heating component can be supported by the tray, and by setting up the sealing cover, the battery cell units and each heating component can be sealed in the space formed after the tray and the sealing cover are connected, reducing the chance of the battery cell units being affected by the external environment.

[0042] A second aspect of an embodiment of the present application provides an electrical equipment, which includes an electrical device and a battery pack. The battery pack uses the battery pack described above, and the battery pack is used to provide electrical energy to the electrical device.

[0043] An embodiment of the present application provides an electric device, which uses the above-mentioned battery pack to provide electric energy to the electric device, thereby improving the power supply stability of the battery pack to the electric device and improving the working stability and endurance of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 A schematic structural diagram of a battery pack provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of a partial structure of a battery pack provided in an embodiment of the present application;

[0047] Figure 3 for Figure 1 Schematic diagram of the structures of the top heating component, middle heating component and bottom heating component.

[0048] Description of reference numerals:

[0049] 10-battery pack;

[0050] 100-cell unit;

[0051] 110-battery cell assembly; 110a-first battery cell assembly; 110b-second battery cell assembly;

[0052] 200-top heating assembly;

[0053] 210-first top connector; 220-second top connector; 230-heat sink;

[0054] 240-second flanging structure;

[0055] 300- bottom heating assembly;

[0056] 310- bottom joint; 320- heating film; 321- heating diaphragm; 322- welding area;

[0057] 323-heating layer;

[0058] 400-medium heating component;

[0059] 410-first middle joint; 420-second middle joint;

[0060] 500-cold plate;

[0061] 510-connector assembly; 520-sealing ring; 530-first flange structure;

[0062] 600-beam assembly;

[0063] 610-first crossbeam; 620-second crossbeam; 621-avoidance groove;

[0064] 700-pallet;

[0065] 710-mounting slot; 720-opening;

[0066] 800-Sealing cover. DETAILED DESCRIPTION

[0067] As described in the background art, the heating uniformity of the battery module in the related art is poor, resulting in poor thermal management capability of the battery pack, affecting the performance and working stability of the battery pack.

[0068] The reason for this problem is that the heating layer in the existing technology cannot heat the two surfaces of each battery module in the height direction, which leads to uneven heating of the battery module, and then to uneven heating of the battery pack, affecting the working stability of the battery pack and the working stability of the electrical equipment that should be powered by the battery pack.

[0069] In response to the above technical problems, an embodiment of the present application provides a battery pack and an electrical device. The battery pack heats the top of the battery cell unit by setting a top heating component on the top surface of the battery cell unit, and heats the bottom surface of the battery cell unit by setting a bottom heating component on the bottom surface of the battery cell unit. Furthermore, if the battery cell unit includes at least two layers of stacked battery cell components, a middle heating component is set between each two layers to ensure that both surfaces of each battery cell component in the stacking direction in the battery cell unit can be heated, thereby achieving uniform heating of each battery cell component, improving the uniformity of heating of the battery cell unit, and further improving the uniformity of heating of the battery pack, as well as improving the thermal management capability of the battery pack and the operating stability of the battery pack.

[0070] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely 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, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0071] refer to Figure 1 An embodiment of the present application provides a battery pack 10 , which may include a battery cell unit 100 , a top heating assembly 200 , a middle heating assembly 400 and a bottom heating assembly 300 .

[0072] The battery cell unit 100 may include at least two stacked battery cell components 110. The stacking direction is as follows: Figure 1 Indicated by the middle arrow Y. In the stacking direction of the battery cell assemblies 110, the two surfaces of the outermost two battery cell assemblies 110 that are separated from each other are the top and bottom surfaces of the battery cell unit 100. The top heating assembly 200 can be located on the top surface of the battery cell unit 100. The bottom heating assembly 300 can be located on the bottom surface of the battery cell unit 100. A middle heating assembly 400 can be installed between any two adjacent layers of battery cell assemblies 110 to heat the two adjacent layers of battery cell assemblies 110.

[0073] An embodiment of the present application provides a battery pack 10, which heats the top of the battery cell unit 100 by arranging a top heating assembly 200 on the top surface of the battery cell unit 100, and heats the bottom surface of the battery cell unit 100 by arranging a bottom heating assembly 300 on the bottom surface of the battery cell unit 100. Furthermore, if the battery cell unit 100 may include at least two layers of stacked battery cell assemblies 110, a middle heating assembly 400 is arranged between each two layers to achieve that both surfaces of each battery cell assembly 110 in the stacking direction of the battery cell unit 100 can be heated, thereby achieving uniform heating of each battery cell assembly 110, improving the uniformity of heating of the battery cell unit 100, and further improving the uniformity of heating of the battery pack 10, as well as improving the thermal management capability of the battery pack 10 and the working stability of the battery pack 10.

[0074] In some embodiments, the number of stacked cell assemblies 110 in the cell unit 100 may be two, three, four, or even more. If there are three cell assemblies 110, there may be two intermediate heating assemblies 400, with one intermediate heating assembly 400 disposed between each two adjacent cell assemblies 110.

[0075] refer to Figure 1The number of battery cell assemblies 110 can be two, and the two battery cell assemblies 110 can be a first battery cell assembly 110a and a second battery cell assembly 110b arranged in a stacked manner. The first battery cell assembly 110a can be located relatively below the second battery cell assembly 110b. The top heating assembly 200 is located on the top surface of the second battery cell assembly 110b, the bottom heating assembly 300 is located on the bottom surface of the first battery cell assembly 110a, and the middle heating assembly 400 is disposed between the first battery cell assembly 110a and the second battery cell assembly 110b.

[0076] In this way, by setting the top heating component 200 on the top surface of the second battery cell component 110b, the bottom heating component 300 is located on the bottom surface of the first battery cell component 110a, and the middle heating component 400 is located between the first battery cell component 110a and the second battery cell component 110b, both surfaces of the first battery cell component 110a and the second battery cell component 110b in the thickness direction can be heated, thereby achieving uniform heating of the first battery cell component 110a and the second battery cell component 110b.

[0077] refer to Figure 1 In some embodiments, the battery pack 10 may further include a tray 700 and a sealing cover 800. The tray 700 has a mounting groove 710, in which the battery cell unit 100 is disposed. The bottom heating assembly 300 is located between the battery cell unit 100 and the bottom wall of the mounting groove 710. The sealing cover 800 is disposed on the top surface of the battery cell unit 100 and is connected to the tray 700. The top heating assembly 200 is disposed between the sealing cover 800 and the battery cell unit 100.

[0078] In this way, by setting up the tray 700 and the sealing cover 800, and setting the battery cell unit 100 and each heating component in the tray 700, the battery cell unit 100 and each heating component can be supported by the tray 700, and by setting up the sealing cover 800, the battery cell unit 100 and each heating component can be sealed in the space formed after the tray 700 and the sealing cover 800 are connected, thereby reducing the probability of the battery cell unit 100 being affected by the external environment.

[0079] In some embodiments, the bottom of the tray 700 may be provided with an insulation layer and a protective plate, with the protective plate being disposed outside the insulation layer. This can reduce heat dissipation from the heating components to the outside of the tray 700 and the sealing cover 800 when the components are operating, and the protective layer can enhance the protection of the tray 700.

[0080] refer to Figure 1In some embodiments, the battery pack 10 may further include a cold plate 500. A cold plate 500 may be provided between any two adjacent layers of battery cell assemblies 110. The cold plate 500 is stacked with the middle heating assembly 400, with the middle heating assembly 400 facing the bottom heating assembly 300. In some embodiments, the middle heating assembly 400 may be attached to the surface of the cold plate 500 using double-sided tape, or the middle heating assembly 400 may be attached to the surface of the cold plate 500 using a thermal adhesive.

[0081] Thus, by providing a cold plate 500 between any two adjacent layers of cell assemblies 110, cooling and heat dissipation can be achieved for each cell assembly 110 in the cell unit 100, thereby improving the cooling capacity of the cell unit 100. In addition, by providing the intermediate heating assembly 400 on the cold plate 500, the multifunctionality of the cold plate 500 can be achieved, and the use of an additional connection structure for installing the intermediate heating assembly 400 can be avoided, thereby improving the structural compactness of the cell assemblies 110 in the cell unit 100.

[0082] In addition, the cold plate 500 can also be used to support the battery cell assembly 110 located above the cold plate 500, avoiding the use of additional supporting structures to support the battery cell assembly 110, which can further improve the structural compactness between the battery cell assemblies 110 in the battery cell unit 100, and can reduce the overall volume of the battery cell unit 100, reducing the space occupied by the battery cell unit 100.

[0083] Continue to refer Figure 1 If the battery cell unit 100 includes a first battery cell assembly 110a and a second battery cell assembly 110b, the cold plate 500 can have one, the cold plate 500 can be arranged between the first battery cell assembly 110a and the second battery cell assembly 110b, and the heating assembly 400 can be arranged on the side of the cold plate 500 facing the first battery cell assembly 110a.

[0084] In this way, the heating uniformity of the first heating film 320 group and the second heating film 320 group can be achieved through the bottom heating component 300, the middle heating component 400 and the top heating component 200, and the first battery cell component 110a and the second battery cell component 110b can be cooled and dissipated respectively through a cold plate 500, thereby improving the uniformity of heat dissipation of the first battery cell component 110a and the second battery cell component 110b and reducing the manufacturing cost of the battery pack 10.

[0085] Furthermore, by arranging the middle heating assembly 400 on the side of the cold plate 500 facing the first battery cell assembly 110a, it is possible to avoid the need for an additional structure for installing and fixing the middle heating assembly 400, thereby reducing the manufacturing cost of the battery pack 10 and improving the structural compactness between the battery cell assemblies 110 in the battery cell unit 100.

[0086] refer to Figure 1 and Figure 2 The cold plate 500 may include a joint assembly 510 and a sealing ring 520. The sidewall of the mounting groove 710 of the tray 700 has an opening 720, and a portion of the joint assembly 510 is disposed within the opening 720. The joint assembly 510 also includes an abutting surface that abuts the inner sidewall of the mounting groove 710 via the sealing ring 520. The extended portion connecting the cold plate 500 and the joint assembly 510 may be covered with a material such as rubber, plastic, or cotton to provide insulation and prevent condensation.

[0087] In some embodiments, the cold plate 500 may be a direct cooling plate or a liquid cooling plate. This improves cooling performance while also ensuring the structural strength of the cold plate 500 so that it can withstand the downward pressure of the upper battery cell assembly 110 and the lateral tension caused by the expansion of the battery cell assembly 110.

[0088] refer to Figure 1 and Figure 3 In some embodiments, the top heating assembly 200 , the bottom heating assembly 300 and the middle heating assembly 400 may each include a heating film 320 , and the orthographic projection of each heating film 320 toward the battery cell assembly 110 fully covers the outer contour of the battery cell assembly 110 .

[0089] In this way, the top heating component 200, the bottom heating component 300 and the middle heating component 400 all use the heating film 320, which can reduce the overall height of the battery cell unit 100 in the stacking direction, thereby reducing the space occupancy of the combined structure of the battery cell unit 100 and each heating component.

[0090] Furthermore, by making the heating film 320 fully cover the outer contour of the battery cell assembly 110 with its positive projection toward the battery cell assembly 110, the heating film 320 can fully cover the surface of each battery cell assembly 110 in the stacking direction, thereby improving the uniformity of heating the battery cell assembly 110 by each heating assembly, and further improving the uniformity of heating the battery cell unit 100 by each heating assembly.

[0091] In some implementations, the heating film 320 may include an insulating film layer and a heating layer 323. The heating layer 323 is disposed between two insulating film layers. The two insulating film layers may be two layers of polyimide film, and the heating layer 323 may be a metal foil of a specific shape, which can be heated by applying electricity to the lead wires. The metal foil can be made of aluminum, copper, stainless steel, etc., and can generally be designed into a "meandering" heating circuit. It should be noted that the insulating film can also be made of a film material such as polyethylene terephthalate.

[0092] In one possible implementation, the heating film 320 is divided into multiple heating zones, with at least some of the heating zones having different power densities. For example, the heating power density of different heating zones can be adjusted by adjusting the total length, cross-sectional width, and cross-sectional thickness of the metal foil to match the rated power at the rated voltage.

[0093] In this way, by dividing each heating film 320 into multiple heating zones and making the power density of at least some of the heating zones different, targeted heating can be performed according to the heating temperature requirements of different areas on the battery cell assembly 110, thereby further improving the heating uniformity of the battery cell assembly 110 and the heating uniformity of the battery.

[0094] refer to Figure 3 In some embodiments, the top heating assembly 200, the middle heating assembly 400, and the bottom heating assembly 300 are electrically connected in series to form a current path.

[0095] In this way, by electrically connecting the top heating component 200, the middle heating component 400, and the bottom heating component 300 in series in sequence to form a current path, compared with the method of heating each heating component separately, the number of joints on each heating component can be reduced, and the manufacturing cost of each heating component and the manufacturing cost of the battery can be reduced.

[0096] In one possible implementation, the top heating assembly 200 has a first top connector 210 and a second top connector 220. The middle heating assembly 400 has a first middle connector 410 and a second middle connector 420. The bottom heating assembly 300 has a bottom connector 310. The first top connector 210 is used to electrically connect to a power source, the second top connector 220 is electrically connected to the first middle connector 410, and the second middle connector 420 is electrically connected to the bottom connector 310.

[0097] In some embodiments, in a battery pack, the power source for powering the top heating assembly 200, the middle heating assembly 400, and the bottom heating assembly 300 may be the battery pack 10, and the top heating assembly 200, the middle heating assembly 400, and the bottom heating assembly 300 may be powered by the battery pack 10 itself.

[0098] In this way, the top heating component 200, the middle heating component 400 and the bottom heating component 300 are connected through the first top joint 210, the second top joint 220, the first middle joint 410, and the second middle joint 420, and the first top joint 210 is provided to be electrically connected to the power supply, so that the top heating component 200, the middle heating component 400 and the bottom heating component 300 can be heated at the same time while using one joint to be electrically connected to the power supply, thereby improving the heating efficiency and simplifying the connection method and heating method between the top heating component 200, the middle heating component 400 and the bottom heating component 300.

[0099] refer to Figure 1 In one example, each layer of the battery cell assembly 110 may have multiple groups arranged in a row. The heating film 320 may include a plurality of connected heating film sheets 321 , each heating film sheet 321 being opposite to one of the battery cell assemblies 110 .

[0100] In this way, by making each heating film 321 correspond to one battery core 110 , it is possible to heat and regulate the temperature of each battery core 110 , thereby improving the heating uniformity of the battery core assembly 110 .

[0101] refer to Figure 1 and Figure 3 In some embodiments, the heating film 320 further includes a welding region 322 located at the outer edge of the heating film 320. The welding region 322 may be a connection between the connector and the heating film 320. The connector may be connected to the heating film 320 by welding. After each connector is connected to the heating film 320, a weld having a certain thickness is formed in the welding region 322.

[0102] In this way, since the structure of the welding area 322 has a certain thickness in the thickness direction of the heating film 320, by setting the welding area 322 at the outer edge of the heating film 320, the heating film 320 can be more closely fitted to the battery cell assembly 110 or the liquid cooling plate 500, and the heating film 320 can be prevented from being damaged by the structure of the welding area 322 in its thickness direction, thereby improving the safety of use of the heating film 320.

[0103] refer to Figure 1 and Figure 3 In some embodiments, the top heating assembly 200 may further include a vapor chamber 230, with the heating film 320 attached to the side of the vapor chamber 230 facing the battery cell assembly 110. The vapor chamber 230 may be a metal plate, such as an aluminum plate or a copper plate. The vapor chamber 230 may cover the top surface of the battery cell unit 100. The vapor chamber 230 may absorb the heat generated by the top heating assembly 200 and evenly transfer the heat to the top surface of the battery cell unit 100.

[0104] In this way, by setting a heat spreader 230 on the top heating component 200, the heat spreader 230 can disperse the heat generated by the heating film 320 of the top heating component 200 when it is working more evenly, thereby improving the heating uniformity of the top heating component 200 on the top surface of the battery cell unit 100.

[0105] refer to Figure 1 and Figure 2 In some embodiments, the battery pack 10 may further include a crossbeam assembly 600 , which is used to support and fix the battery cell unit 100 .

[0106] In this way, by setting up the crossbeam assembly 600 and supporting and fixing the battery cell unit 100 through the crossbeam assembly 600, the structural stability of the battery cell unit 100 can be improved and the probability of the battery cell assembly 110 in the battery cell unit 100 shaking can be reduced, thereby improving the structural stability and working stability of the battery pack 10.

[0107] refer to Figure 1 and Figure 2 In some embodiments, the beam assembly 600 may include a plurality of first beams 610 and a plurality of second beams 620. The plurality of first beams 610 are arranged along a first direction (eg Figure 1 The first battery cell assemblies 110a are arranged in a spaced relationship (as indicated by the arrow X in the middle), with the first battery cell assemblies 110a disposed between two adjacent first crossbeams 610. Multiple first crossbeams 610 are used to support the second battery cell assemblies 110b. The second crossbeams 620 are connected to the first crossbeams 610 in a one-to-one correspondence, with the second battery cell assemblies 110b disposed between the two connected second crossbeams 620.

[0108] In this way, by positioning the first battery cell assembly 110 a between two adjacent first beams 610 in the first direction, the first battery cell assembly 110 a can be limited and fixed in the first direction.

[0109] Similarly, by positioning the second battery cell assembly 110 b between two adjacent second beams 620 in the first direction, the second battery cell assembly 110 b can be fixed in position in the first direction, thereby improving the structural stability of the second battery cell assembly 110 b.

[0110] In some embodiments, there may be two first battery cell assemblies 110a. There may be three first crossbeams 610, with the three first crossbeams 610 spaced apart along the first direction. A battery cell assembly 110 may be disposed between each two adjacent first crossbeams 610. Similarly, there may be two second battery cell assemblies 110b. There may be three second crossbeams 620, with the three second crossbeams 620 spaced apart along the first direction. A battery cell 110 may also be disposed between each two adjacent second crossbeams 620.

[0111] refer to Figure 1 and Figure 2 In some embodiments, if the battery pack 10 further includes a cold plate 500, the cold plate 500 is disposed between the first battery cell assembly 110a and the second battery cell assembly 110b, and the intermediate heating assembly 400 is disposed on the side of the cold plate 500 facing the first battery cell assembly 110a. The cold plate 500 can be overlapped on multiple first crossbeams 610, and the first crossbeams 610 are used to support the cold plate 500 and the second battery cell assembly 110b on the cold plate 500. The cold plate 500 can also be connected to the first crossbeams 610 via connectors to improve the connection stability between the first crossbeams 610 and the cold plate 500.

[0112] The first crossbeam 610 is connected to the cold plate 500 to support and fix the second battery cell assembly 110b located above the cold plate 500, thereby enriching the function of the cold plate 500 and reducing the spacing between the first battery cell assembly 110a and the second battery cell assembly 110b in the thickness direction, thereby reducing the space occupancy of the battery cell unit 100.

[0113] refer to Figure 2 In some embodiments, the second beam 620 is connected to the first beam 610 , and the first beam 610 and the second beam 620 clamp the cold plate 500 .

[0114] In this way, by positioning a portion of the cold plate 500 between the first beam 610 and the second beam 620, and the first beam 610 and the second beam 620 passing through the cold plate 500 for connection, the cold plate 500 can be clamped by the first beam 610 and the second beam 620, thereby improving the connection stability between the cold plate 500 and the beam assembly 600, and thereby improving the supporting stability of the beam assembly 600 for the battery cell unit 100.

[0115] refer to Figure 2 In some embodiments, both ends of the cold plate 500 along the first direction are provided with a first flange structure 530 , and the first flange structure 530 overlaps the outer side wall of the second beam 620 and can be connected by rivets.

[0116] The top heating assembly 200 is disposed on a side of the second beam 620 facing away from the first beam 610 . The top heating assembly 200 has a second flange structure 240 at both ends along the first direction. The second flange structure 240 is connected to the outer side wall of the second beam 620 .

[0117] In this way, by providing the first flange structure 530 , the connection stability between the cold plate 500 and the second beam 620 can be improved, thereby improving the fixing effect of the second beam 620 on the second battery cell assembly 110 b on the cold plate 500 .

[0118] The cold plate 500 has a cooling channel on the side facing the second battery cell assembly 110b, and the second crossbeam 620 has a relief groove 621 on the side facing the cold plate 500 to avoid the cooling channel. This prevents the second crossbeam 620 from crushing the cooling channel on the cold plate 500, thereby improving the service life of the cold plate 500 and the safety of the battery pack 10.

[0119] In some embodiments, along the first direction, the heating film 320 of the middle heating assembly 400 located on the cold plate 500 can be located in the spacing area between the three first beams 610, which can avoid the risk of the heating film 320 being crushed or torn due to the pressure under the beam or the vibration lateral friction, thereby causing insulation failure.

[0120] Similarly, the heating film 320 of the top heating assembly 200 located on the top surface of the battery cell unit 100 may also be located in the spacing area between the three second beams 620 .

[0121] In some embodiments, the two first beams 610 located at both ends in the first direction have a groove on one end facing the middle heating component 400. The groove can be used to avoid the lead-out area on the middle heating component 400 for connecting the first middle joint 410 and the second middle joint 420, thereby preventing the heating film 320 of the middle heating component 400 from being crushed by the first beam 610.

[0122] In some embodiments, the outer surfaces of the first and second crossbeams 610, 620, the outer surface of the cold plate 500, and the inner surface of the mounting slot 710 of the tray 700 are all covered with an insulating layer. In a specific implementation, the insulating layer can be an epoxy resin layer or a polyimide film. This provides electrical isolation and reduces the risk of insulation failure.

[0123] An embodiment of the present application further provides an electrical device, which may include an electrical device and a battery pack 10. The battery pack 10 uses the battery pack 10 described above, and the battery pack 10 is used to provide electrical energy to the electrical device.

[0124] An embodiment of the present application provides an electrical device, which uses the above-mentioned battery pack 10 to provide electric energy to the electrical device, thereby improving the power supply stability of the battery pack 10 to the electrical device and improving the working stability and endurance of the electrical device.

[0125] In some embodiments, the electrical equipment can be a vehicle or an energy storage device. The vehicle can be an electric vehicle / equipment (Electric Vehicle, referred to as EV), a pure electric vehicle equipment (Pure Electric Vehicle / Battery Electric Vehicle, referred to as PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, referred to as HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle (New Energy Vehicle).

[0126] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0127] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0128] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0129] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0130] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell unit, wherein the battery cell unit comprises at least two layers of stacked battery cell components, wherein in the stacking direction of the battery cell components, two surfaces of the two outermost battery cell components that are away from each other are the top and bottom surfaces of the battery cell unit; A top heating assembly, the top heating assembly being located on the top surface of the battery cell unit; A bottom heating assembly, the bottom heating assembly being located on the bottom surface of the battery cell unit; A middle heating component is provided between at least two adjacent layers of the battery core components, and is used to heat the battery core components of the two adjacent layers.

2. The battery pack according to claim 1, wherein: It also includes a cold plate, which is provided between any two adjacent layers of the battery core components. The cold plate is stacked with the middle heating component, and the middle heating component faces the bottom heating component.

3. The battery pack according to claim 1, wherein: The top heating assembly, the bottom heating assembly, and the middle heating assembly all include heating films, and the orthographic projection of each heating film toward the battery core assembly completely covers the outer contour of the battery core assembly.

4. The battery pack according to claim 3, characterized in that: The heating film is divided into a plurality of heating zones, and at least some of the heating zones have different heating power densities.

5. The battery pack according to claim 1, wherein: The top heating component, the middle heating component, and the bottom heating component are electrically connected in series in sequence.

6. The battery pack according to claim 5, characterized in that: The top heating assembly is provided with a first top joint and a second top joint; The middle heating assembly is provided with a first middle joint and a second middle joint; The bottom heating assembly is provided with a bottom joint; The first top connector is used to be electrically connected to a power source, the second top connector is electrically connected to the first middle connector, and the second middle connector is electrically connected to the bottom connector.

7. The battery pack according to claim 3, characterized in that: Each layer of the battery cell components has multiple groups arranged side by side; The heating film includes a plurality of connected heating film sheets, and each heating film sheet is opposite to one of the battery core components.

8. The battery pack according to claim 7, characterized in that: The heating film further has a welding area, which is located at the outer edge of the heating film.

9. The battery pack according to claim 3, wherein: The top heating component further includes a vapor chamber, and the heating film is attached to a side of the vapor chamber facing the battery core component.

10. The battery pack according to any one of claims 1 to 6, characterized in that: It also includes a crossbeam assembly, which is used to support and fix the battery cell unit.

11. The battery pack according to claim 10, wherein: The battery cell unit includes a first battery cell assembly and a second battery cell assembly that are stacked, and the second battery cell assembly is located relatively above the first battery cell assembly; The top heating component is located on the top surface of the second battery core component, the bottom heating component is located on the bottom surface of the first battery core component, and the middle heating component is arranged between the first battery core component and the second battery core component.

12. The battery pack according to claim 11, wherein: The beam assembly includes a plurality of first beams and a plurality of second beams; A plurality of the first crossbeams are arranged at intervals along a first direction, the first battery cell assembly is arranged between two adjacent first crossbeams, and the plurality of the first crossbeams are used to support the second battery cell assembly; The second crossbeams are connected to the first crossbeams in a one-to-one correspondence, and the second battery cell assembly is arranged between the two connected second crossbeams.

13. The battery pack according to claim 12, wherein: The battery pack further includes a cold plate, which is arranged between the first battery cell assembly and the second battery cell assembly, and the intermediate heating assembly is arranged on a side of the cold plate facing the first battery cell assembly; The first crossbeam is connected to the cold plate and is used to support the second battery cell assembly on the cold plate; And / or, the second crossbeam is connected to the first crossbeam, and the first crossbeam and the second crossbeam clamp the cold plate.

14. The battery pack according to any one of claims 1 to 3, characterized in that: Also includes a tray and sealing lid; The tray has a mounting groove, the battery cell unit is arranged in the mounting groove, and the bottom heating assembly is located between the battery cell unit and the bottom wall of the mounting groove; The sealing cover is arranged on the top surface of the battery cell unit and is connected to the tray. The top heating component is arranged between the sealing cover and the battery cell unit.

15. An electrical device, characterized in that: The invention comprises an electric device and a battery pack, wherein the battery pack is a battery pack as claimed in any one of claims 1 to 14, and the battery pack is used to provide electric energy to the electric device.

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