Battery packs and electrical devices

Abstract

This utility model provides a battery pack and an electrical device. The battery pack includes: a battery housing; a heat exchanger disposed within a receiving cavity, wherein a first heat exchange channel is provided within the heat exchanger; and the cross-sectional area of ​​the first heat exchange channel is S1 mm in a plane perpendicular to the length direction of the heat exchanger. 2 The cross-sectional area of ​​the heat exchanger is S2mm. 2 The relationship satisfies: 0.3 ≤ S1mm 2 / S2mm 2 ≤0.98; a first battery pack and a second battery pack are respectively disposed on both sides of the heat exchanger; the first battery pack includes a first battery cell, the first battery cell having a first surface with the largest surface area; the second battery pack includes a second battery cell, the second battery cell having a second surface with the largest surface area, both the first and second surfaces facing the heat exchanger. The technical solution of this application effectively solves the problem in related technologies where heat accumulation between two adjacent battery packs easily leads to a decrease in the working performance of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] Currently, with the increasing popularity of electric vehicles, the design and optimization of battery packs, the core component of their energy storage devices, has become particularly important. Battery packs not only bear the responsibility of supplying energy to the vehicle or energy storage device, but are also crucial for ensuring the overall safety of the vehicle.

[0003] In related technologies, a battery pack includes at least two battery cells, which generate heat during operation. Furthermore, heat accumulates significantly between adjacent battery cells, making it difficult for the heat to dissipate. This results in uneven heat distribution within the battery pack, leading to localized overheating, decreased battery pack performance, and even safety issues such as thermal runaway.

[0004] Thus, heat buildup between two adjacent battery packs in related technologies can easily lead to a decrease in the performance of the battery pack. Utility Model Content

[0005] The main objective of this invention is to provide a battery pack and power supply device to solve the problem of heat accumulation between two adjacent battery packs in related technologies, which easily leads to a decrease in the working performance of the battery pack.

[0006] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a battery housing, including a frame and a base plate connected to the frame, the frame and the base plate forming a receiving cavity; a heat exchanger disposed within the receiving cavity, the heat exchanger being connected to the frame and / or the base plate, and a first heat exchange channel being provided within the heat exchanger; the cross-sectional area of ​​the first heat exchange channel is S1mm in a plane perpendicular to the length direction of the heat exchanger. 2 The cross-sectional area of ​​the heat exchanger is S2mm. 2 The relationship satisfies: 0.3 ≤ S1mm 2 / S2mm 2 ≤0.98; The first battery pack and the second battery pack are respectively disposed on both sides of the heat exchanger; the first battery pack includes a first battery cell, the first battery cell having a first surface with the largest surface area; the second battery pack includes a second battery cell, the second battery cell having a second surface with the largest surface area, and both the first surface and the second surface are disposed facing the heat exchanger.

[0007] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0008] By applying the above technical solution, and by setting a heat exchanger within the housing cavity and defining the ratio of the cross-sectional area of ​​the first heat exchange channel to the cross-sectional area of ​​the heat exchanger, effective heat dissipation is achieved in the intermediate region between the first and second battery packs, reducing localized heat accumulation. Furthermore, for S1mm... 2 / S2mm 2 The defined flow range ensures sufficient fluid to flow in the first heat exchange channel to dissipate heat between the first and second battery packs, while also reducing excessive volume occupation of the receiving cavity and improving the compactness of the battery pack. The heat exchanger is connected to the frame and / or base plate, facilitating its fixation within the receiving cavity. Furthermore, by aligning the surfaces with the largest surface areas of the first and second battery packs towards the heat exchanger, the heat exchange efficiency between the heat exchanger and adjacent first and second battery cells is increased. This results in a more uniform temperature distribution within the battery pack during charging and discharging, preventing localized heat buildup from affecting battery pack performance, extending battery life, and improving the stability and safety of the entire battery system. Therefore, the technical solution of this application effectively solves the problem of heat buildup between adjacent battery packs in related technologies, which easily leads to a decline in battery pack performance. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0010] Figure 1 A perspective structural schematic diagram of an embodiment of the battery pack according to the present invention is shown;

[0011] Figure 2 It shows Figure 1 A top view of the battery pack;

[0012] Figure 3 It shows Figure 2 A cross-sectional view of the battery pack along the AA direction;

[0013] Figure 4 It shows Figure 3 A magnified view of part B of the battery pack;

[0014] Figure 5 It shows Figure 1 A cross-sectional view of the battery pack's partition beam.

[0015] The above figures include the following reference numerals:

[0016] 10. Battery housing; 11. Frame; 12. Base plate;

[0017] 20. Heat exchanger; 21. First heat exchange channel; 211. First channel; 212. Second channel; D. Wall thickness;

[0018] 30. First battery pack; 31. First battery cell; 311. First surface;

[0019] 40. Second battery pack; 41. Second battery cell; 411. Second surface. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] In this embodiment, as Figures 1 to 4As shown, the battery pack includes: a battery housing 10, a heat exchanger 20, a first battery pack 30, and a second battery pack 40. The battery housing 10 includes a frame 11 and a base plate 12 connected to the frame 11, forming a receiving cavity. The heat exchanger 20 is disposed within the receiving cavity and is connected to the frame 11 and / or the base plate 12. A first heat exchange channel 21 is provided within the heat exchanger 20. In a plane perpendicular to the length direction of the heat exchanger 20, the cross-sectional area of ​​the first heat exchange channel 21 is S1 mm. 2 The cross-sectional area of ​​heat exchanger 20 is S2mm. 2 The relationship satisfies: 0.3mm 2 ≤S1mm 2 / S2mm 2 ≤0.98mm 2 The first battery pack 30 and the second battery pack 40 are respectively disposed on both sides of the heat exchanger 20. The first battery pack 30 includes a first battery cell 31, which has a first surface 311 with the largest surface area. The second battery pack 40 includes a second battery cell 41, which has a second surface 411 with the largest surface area. Both the first surface 311 and the second surface 411 face the heat exchanger 20.

[0024] By applying the above technical solution, and by setting a heat exchanger 20 within the accommodating cavity and defining the ratio of the cross-sectional area of ​​the first heat exchange channel 21 to the cross-sectional area of ​​the heat exchanger 20, effective heat dissipation is achieved in the intermediate region between the first battery pack 30 and the second battery pack 40, reducing localized heat accumulation. Furthermore, for S1mm... 2 / S2mm 2 The defined flow range ensures sufficient fluid to flow within the first heat exchange channel 21 for heat dissipation in the intermediate region between the first battery pack 30 and the second battery pack 40, while also reducing excessive volume occupation of the receiving cavity and improving the compactness of the battery pack. The heat exchanger 20 is connected to the frame 11 and / or the base plate 12, facilitating its fixation within the receiving cavity. Furthermore, by aligning the surfaces of the first battery pack 30 and the second battery pack 40 with the largest surface area facing the heat exchanger 20, the heat exchange efficiency of the heat exchanger 20 for adjacent first battery cells 31 and second battery cells 41 is increased. This results in a more uniform temperature distribution within the battery pack during charging and discharging, preventing localized heat buildup from affecting battery pack performance, extending battery life, and improving the stability and safety of the entire battery system. Therefore, the technical solution of this application effectively solves the problem of heat buildup between adjacent battery packs in related technologies, which easily leads to a decline in battery pack performance.

[0025] Preferably, S1mm 2 / S2mm 2The values ​​are 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, or 0.98.

[0026] In this embodiment, the first battery pack 30 includes a plurality of first battery cells 31, and the surface with the largest surface area of ​​the first battery cell 31 closest to the heat exchanger 20 is the first surface 311. The second battery pack 40 includes a plurality of second battery cells 41, and the surface with the largest surface area of ​​the second battery cell 41 closest to the heat exchanger 20 is the second surface 411.

[0027] Furthermore, the cross-sectional area of ​​the first heat exchange channel 21 is S1mm. 2 The cross-sectional area of ​​heat exchanger 20 is S2mm. 2 The relationship satisfies: 0.5 ≤ S1mm 2 / S2mm 2 ≤0.8. Through S1mm 2 / S2mm 2 The further limitation of the range ensures that sufficient fluid can flow in the first heat exchange channel 21 to dissipate heat in the intermediate region between the first battery pack 30 and the second battery pack 40, and also reduces excessive occupancy of the housing volume, improving the compactness of the battery pack.

[0028] Furthermore, the cross-sectional area of ​​the first heat exchange channel 21 is S1mm. 2 Meets the requirement of 192mm 2 ≤S1mm 2 ≤6140mm 2 By limiting the cross-sectional area of ​​the first heat exchange channel 21, effective heat dissipation is achieved in the middle area between the first battery pack 30 and the second battery pack 40, reducing heat accumulation in local areas and avoiding excessive occupation of the cavity volume, thus improving the compactness of the battery pack.

[0029] Preferably, the cross-sectional area of ​​the first heat exchange channel 21 is S1mm. 2 192mm 2 200mm 2 500mm 2 1000mm 2 1500mm 2 2000mm 2 2500mm 2 3000mm 2 3500mm 2 4000mm 2 4500mm 2 5000mm 2 5500mm2 6000mm 2 Or 6140mm 2 .

[0030] Furthermore, the cross-sectional area of ​​the heat exchanger 20 is S2mm. 2 Meets the requirement of 600mm 2 ≤S1mm 2 ≤6250mm 2 By limiting the cross-sectional area of ​​the heat exchanger 20, effective heat dissipation is achieved in the middle area between the first battery pack 30 and the second battery pack 40, reducing heat accumulation in local areas and avoiding excessive occupation of the cavity volume, thus improving the compactness of the battery pack.

[0031] Preferably, the cross-sectional area of ​​the heat exchanger 20 is S2mm. 2 600mm 2 1000mm 2 1500mm 2 2000mm 2 2500mm 2 3000mm 2 3500mm 2 4000mm 2 4500mm 2 5000mm 2 5500mm 2 6000mm 2 Or 6250mm 2 .

[0032] In an embodiment not shown, the first surface and the second surface are in contact with the heat exchanger. When the first and second surfaces are in direct contact with the heat exchanger, this direct contact enhances the thermal conduction between the battery and the heat exchanger, reduces thermal resistance, accelerates the heat exchange rate, and can promptly remove heat, preventing the problem of localized overheating leading to a decline in battery pack performance.

[0033] In this embodiment, when the first battery pack 30 includes a plurality of first battery cells 31, one of the first battery cells 31 closest to the heat exchanger 20 contacts the heat exchanger 20. When the second battery pack 40 includes a plurality of second battery cells 41, one of the second battery cells 41 closest to the heat exchanger 20 contacts the heat exchanger 20.

[0034] like Figures 1 to 4As shown, a first preset gap exists between the first surface 311 and the heat exchanger 20, and a second preset gap exists between the second surface 411 and the heat exchanger 20. The presence of the first preset gap between the first surface 311 and the heat exchanger 20, and the presence of the second preset gap between the second surface 411 and the heat exchanger 20, balances heat exchange efficiency with the assembly requirements of the battery pack. The existence of the first and second preset gaps facilitates the installation of the first battery pack 30 and the second battery pack 40.

[0035] In this embodiment, when the first battery pack 30 includes a plurality of first battery cells 31, the first preset gap is the gap between the first battery cell 31 closest to the heat exchanger 20 and the heat exchanger 20. When the second battery pack 40 includes a plurality of second battery cells 41, the second preset gap is the gap between the second battery cell 41 closest to the heat exchanger 20 and the heat exchanger 20.

[0036] like Figures 1 to 4 As shown, the distance L1mm of the first preset gap satisfies: 1.0mm≤L1mm≤5.0mm. By limiting the range of the first preset distance, sufficient assembly space is ensured without significantly reducing heat conduction efficiency due to excessively large gaps.

[0037] like Figures 1 to 4 As shown, the distance L2mm of the second preset gap satisfies: 1.0mm≤L2mm≤5.0mm. By limiting the range of the second preset distance, sufficient assembly space is ensured without significantly reducing heat conduction efficiency due to excessively large gaps.

[0038] Preferably, L1mm is 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, or 5.0mm. L2mm is 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, or 5.0mm.

[0039] In an embodiment not shown, the battery pack further includes a first thermally conductive structural adhesive layer disposed within a first predetermined gap. The first thermally conductive structural adhesive layer enhances the thermal conductivity between the first battery cell and the heat exchanger. Furthermore, the first thermally conductive structural adhesive layer also improves the connection strength between the first battery pack and the heat exchanger.

[0040] In an embodiment not shown, the battery pack further includes a second thermally conductive structural adhesive layer disposed within a second predetermined gap. The second thermally conductive structural adhesive layer enhances the thermal conductivity between the second battery cell and the heat exchanger. Furthermore, the second thermally conductive structural adhesive layer also improves the connection strength between the second battery pack and the heat exchanger.

[0041] like Figures 1 to 4 As shown, the relationship between the distance L1mm of the first preset gap and the distance L2mm of the second preset gap satisfies: L1mm = L2mm. When the distances of the first preset gap and the second preset gap are equal, it means that the heat exchange conditions between the first battery cell 31 and the second battery cell and the heat exchanger 20 are the same, which further facilitates the balanced distribution of heat inside the battery pack and improves the overall performance and safety of the battery pack.

[0042] In an embodiment not shown, the distance L1mm of the first preset gap and the distance L2mm of the second preset gap satisfy the condition: L1mm < L2mm. The battery pack also includes a second thermally conductive structural adhesive layer disposed within the second preset gap. When the structural arrangement within the battery pack makes the distance of the first preset gap smaller than the distance of the second preset gap, the second thermally conductive structural adhesive layer disposed within the second preset gap can ensure the overall heat dissipation performance of the battery pack while allowing for fine-tuning to meet the heat dissipation requirements of different battery groups. Because the distance of the second preset gap is relatively large, the thermal conductivity between the second battery cell and the heat exchange component can be increased by distributing the second thermally conductive structural adhesive layer within the second preset gap, resulting in a more even distribution of heat within the battery pack.

[0043] In an embodiment not shown, the first surface contacts the heat exchanger, and the second surface has a second preset gap with the heat exchanger. The battery pack also includes a second thermally conductive structural adhesive layer disposed within the second preset gap. This design, where the first surface contacts the heat exchanger and the second surface has a second preset gap, allows for flexible adjustment of the heat exchange characteristics of the components within the battery pack. The direct contact between the first surface and the heat exchanger ensures rapid heat dissipation from the first battery cell. For the second battery cell, since there is a gap between it and the heat exchanger, filling it with the second thermally conductive structural adhesive layer ensures good thermal conductivity. Furthermore, this design facilitates battery pack assembly and reduces assembly requirements.

[0044] like Figures 1 to 4 As shown, the heat exchanger 20 is a partition beam, which is disposed within the receiving cavity and divides the receiving cavity into a first receiving cavity and a second receiving cavity. The first battery pack 30 is disposed within the first receiving cavity, and the second battery pack 40 is disposed within the second receiving cavity. Designing the heat exchanger 20 as a partition beam to separate the first and second receiving cavities not only strengthens the structural strength of the battery pack and improves its resistance to external impacts, but also achieves efficient heat management of the first battery pack 30 and the second battery pack 40 through the first heat exchange channel 21 disposed within the partition beam, reducing localized heat unevenness. As a physical barrier between the first battery pack 30 and the second battery pack 40, the partition beam can effectively prevent chain reactions caused by battery pack failure, improving the safety of the battery pack.

[0045] Furthermore, the heat exchanger 20 is configured as a partition beam, and by adjusting S1mm 2 / S2mm 2 The scope is limited to ensure the structural strength of the partition beam while ensuring that sufficient fluid can flow in the first heat exchange channel 21 to dissipate heat in the middle area of ​​the first battery pack 30 and the second battery pack 40.

[0046] In some embodiments, the partition beam can serve as a support and connection, thereby improving the structural strength of the battery box 10. In other embodiments, the heat exchanger 20 is only connected to the frame 11 and / or the base plate 12, without providing support, and has no impact on the structural strength of the battery box 10; for example, the heat exchanger 20 is a thin-walled beam or a flexible tube.

[0047] like Figure 5 As shown, a first heat exchange channel 21 is provided within the partition beam. The first heat exchange channel 21 includes a first channel 211 and a second channel 212. The first end of the first channel 211 corresponds to and is isolated from the first end of the second channel 212, while the second end of the first channel 211 corresponds to and is connected to the second end of the second channel 212. This arrangement of the first heat exchange channel 21 within the partition beam forms a circulating flow path, enhancing heat transfer efficiency and effectively managing localized heat between the first battery pack 30 and the second battery pack 40. This avoids localized overheating and improves heat exchange efficiency and uniformity, thus extending battery life. For example, the partition beam may have a U-shaped cross-section.

[0048] It should be noted that the corresponding arrangement of the first end of the first flow channel 211 and the first end of the second flow channel 212 means that the first ends of the first flow channel 211 and the first ends of the second flow channel 212 are spatially adjacent. The mutual isolation of the first ends of the first flow channel 211 and the first ends of the second flow channel 212 means that the first ends of the first flow channel 211 and the first ends of the second flow channel 212 are not directly connected, but are indirectly connected through the second ends of the first flow channel 211 and the second ends of the second flow channel 212.

[0049] like Figure 5 As shown, the flow area of ​​the first flow channel 211 and the flow area of ​​the second flow channel 212 are equal. The equal flow area ensures that there is no significant pressure difference or flow resistance difference between the fluid in the first flow channel 211 and the second flow channel 212, which helps to maintain the operational stability of the heat exchange operation and also reduces noise and vibration caused by fluid pressure fluctuations.

[0050] In an embodiment not shown, the first heat exchange channel further includes a third channel. The first ends of the second and third channels are correspondingly arranged, and the second ends of the second and third channels are correspondingly arranged; the first ends of the second and third channels are connected. This connection between the first and second channels, and between the second and third channels, forms a complex circulation path, ensuring fluid flow throughout the partition beam, reducing thermal resistance, and improving heat exchange efficiency. For example, the partition beam may have an S-shaped cross-section.

[0051] like Figure 5 As shown, the flow area of ​​the second flow channel 212 is equal to that of the third flow channel. The equal flow area ensures that there is no significant pressure difference or flow resistance difference between the fluid in the second flow channel 212 and the third flow channel, which helps to maintain the operational stability of the heat exchange operation and also reduces noise and vibration caused by fluid pressure fluctuations.

[0052] like Figure 4 As shown, the wall thickness Dmm of the separator beam satisfies the following condition: 0.2mm ≤ Dmm ≤ 2.0mm. Limiting the wall thickness of the separator beam within a specific range ensures a balance between structural strength and heat exchange efficiency. Too thin a wall thickness would affect the structural strength of the separator beam, making it prone to damage under heavy loads or external impacts, while too thick a wall thickness might reduce heat exchange efficiency and affect the heat dissipation performance of the battery pack. By limiting the range of the separator beam's wall thickness, heat exchange efficiency can be maximized without compromising structural strength, thereby improving system reliability.

[0053] Preferably, the wall thickness Dmm of the partition beam is 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm or 2.0mm.

[0054] In an embodiment not shown, the distance between the surface of the separator beam facing away from the base plate 12 and the base plate 12 is greater than the distance between the surface of the first battery cell 31 facing away from the base plate 12 and the base plate 12. This higher height of the separator beam allows it to better function as a physical barrier between the first battery pack 30 and the second battery pack 40, more effectively preventing chain reactions caused by battery pack failure, thus improving the protective effect of the separator beam and enhancing the safety of the battery pack.

[0055] It should be noted that the base plate 12 is not limited to being located on the bottom surface of the battery pack. When the battery pack is arranged as shown in the figure, the base plate 12 is located on the bottom surface of the battery pack. When the battery pack is arranged vertically, the base plate 12 is located on the side of the battery pack.

[0056] like Figure 4As shown, the distance between the surface of the separator beam facing away from the base plate 12 and the base plate 12 is less than the distance between the surface of the first battery cell 31 facing away from the base plate 12 and the base plate 12. This allows for a lower height of the separator beam, enabling the top space of the separator beam to be used for arranging components such as wires and sensors, thus improving the design flexibility and convenience of the battery pack.

[0057] In an embodiment not shown, the distance between the surface of the separator beam facing away from the base plate and the base plate is equal to the distance between the surface of the first battery cell facing away from the base plate and the base plate. This setting the height of the separator beam to be the same as the height of the first battery cell ensures that the structures mounted on the separator beam and the first battery cell are on the same horizontal plane. This uniform height standard reduces errors during assembly, simplifies the battery pack structure, and improves the efficiency and accuracy of production assembly. Furthermore, setting the height of the separator beam to be the same as the height of the first battery cell increases the height of the first heat exchange channel within the separator beam, thereby improving heat exchange efficiency.

[0058] like Figures 1 to 4 As shown, the first battery pack 30 and the second battery pack 40 are arranged opposite each other on both sides of the heat exchanger 20 along a preset direction. The first battery pack 30 includes a plurality of first battery cells 31 arranged along the preset direction, and the plurality of first surfaces 311 of the plurality of first battery cells 31 are arranged in parallel. The above arrangement ensures that when the battery pack is subjected to external impact, the force borne by each battery cell is evenly distributed, avoiding battery deformation or damage caused by uneven force. This structural layout provides better mechanical strength in battery pack design and reduces battery failure rate.

[0059] like Figures 1 to 4 As shown, the first battery pack 30 and the second battery pack 40 are arranged opposite each other on both sides of the heat exchanger 20 along a preset direction. The second battery pack 40 includes a plurality of second battery cells 41 arranged along the preset direction, and the plurality of second surfaces 411 of the plurality of second battery cells 41 are arranged in parallel. The above arrangement ensures that when the battery pack is subjected to external impact, the force borne by each battery cell is evenly distributed, avoiding battery deformation or damage caused by uneven force. This structural layout provides better mechanical strength in battery pack design and reduces battery failure rate.

[0060] In other embodiments, the first battery pack 30 and the second battery pack 40 are disposed opposite each other on both sides of the heat exchanger 20 along a preset direction. The first battery pack 30 includes a plurality of first battery cells 31 disposed along the preset direction, and the plurality of first surfaces 311 of the plurality of first battery cells 31 are disposed in parallel. Alternatively, the second battery pack 40 includes a plurality of second battery cells 41 disposed along the preset direction, and the plurality of second surfaces 411 of the plurality of second battery cells 41 are disposed in parallel.

[0061] like Figures 1 to 5As shown, the base plate 12 is a heat exchange plate, and a second heat exchange channel is provided inside the heat exchange plate. The base plate 12 being configured as a heat exchange plate and equipped with a second heat exchange channel provides a dual cooling mechanism that significantly improves the overall thermal management capability of the battery pack. The base plate 12, configured as a heat exchange plate, not only supports the battery pack but also rapidly dissipates heat from the bottom of the first battery pack 30 and the second battery pack 40 through the internal second heat exchange channel, preventing heat accumulation at the bottom of the batteries.

[0062] This application also provides an electrical device, an embodiment of which includes a battery pack, the battery pack being the aforementioned battery pack. Because the aforementioned battery pack can solve the problem in related technologies where heat buildup between two battery packs easily leads to a decrease in the battery pack's performance, the electrical device having this battery pack can solve the same technical problem.

[0063] In this embodiment, the partition beam can be disposed within the receiving cavity of the battery pack and extend laterally or longitudinally to divide the receiving cavity into a first receiving cavity and a second receiving cavity. The partition beam can be fixedly connected to the side wall of the battery box, and the partition beam can divide the receiving cavity of the battery box into multiple sub-spaces (including the first receiving cavity and the second receiving cavity), with at least two battery module assemblies (including the first battery pack and the second battery pack) respectively disposed in the multiple sub-spaces. The partition beam can be a strip structure, with its two ends in the first direction respectively connected to the two first side walls of the battery box to divide the receiving cavity inside the battery box into two spaces located on both sides of the partition beam along the second direction. The partition beam can be made of metal material, such as aluminum, or it can be integrally formed by rubber injection molding, plastic injection molding, or molding injection molding, wherein the plastic used for plastic injection molding can be polyethylene, polypropylene, ABS, PA, polystyrene, etc. The partition beam can be formed by die casting or by other methods such as extrusion molding, and then connected to the battery box by welding.

[0064] The battery pack in this embodiment includes a battery pack composed of multiple battery cells connected in series and / or parallel, a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are placed inside a battery housing 10 and sealed with a cover plate, forming a complete functional unit capable of directly outputting electrical energy. The battery pack, as a rechargeable battery, is the power source for new energy vehicles. A battery pack generally includes cell modules, a battery management system (BMS) control module, and a battery housing 10 that houses the cell modules and the BMS control module. The battery pack includes a battery housing 10 and multiple battery cells housed within the battery housing 10. The battery housing 10 is divided into upper and lower parts; the upper part includes a cover plate, and the lower part includes a frame 11 and a base plate 12. The upper and lower parts are sealed together. The battery pack includes at least two cell units, a BMS control assembly, and a battery housing 10. A battery pack typically includes a battery housing 10 and battery modules. The battery housing 10 includes a lower battery housing 10 composed of a frame 11, a base plate 12, and a cover plate. A battery pack generally includes the battery housing 10, individual battery cells, and a separator plate. Both the individual battery cells and the separator plate are located within the battery housing 10. The separator plate is located on the side of the individual battery cell away from the base plate 12 of the battery housing 10, separating the individual battery cell from other components located above it, thus providing isolation.

[0065] In this embodiment, the battery housing 10 refers to a closed or semi-closed structure made of materials such as metal and plastic. It serves as the physical carrier for the first battery pack 30 and the second battery pack 40, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The battery housing 10 provides installation space for the first battery pack 30, the second battery pack 40, the BMS, the cooling system, electrical connection components, etc., and fixes these components inside the battery housing 10 through a reasonable structural design, ensuring that they maintain a relatively stable position during battery pack operation and avoiding damage to components or loosening of connections due to vibration, impact, or other factors. The battery housing 10 includes a lower housing, which includes a base plate 12 and side plates connected to and surrounding the base plate 12, forming a frame 11. An upper housing is connected to the side plates and has a cover plate opposite to the base plate 12. The upper housing and the lower housing together form a receiving cavity. The battery pack's battery housing 10 generally consists of an upper housing and a lower housing. The lower housing typically has four side panels and a bottom plate 12. The four side panels can be integrally formed with the bottom plate 12, or they can be separately formed and fixedly connected. The battery housing 10 may include a bottom and a cover plate, which overlap and together define a cavity for accommodating the battery modules. The battery housing 10 can be cast from materials such as steel plates and aluminum alloys, or it can be made from lightweight materials, such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the battery housing 10 can be cylindrical, cuboid, cube, etc.

[0066] In this embodiment, multiple first battery cells 31 with equivalent capacity and internal resistance are connected in series or in parallel to form a first battery pack 30. Multiple second battery cells 41 with equivalent capacity and internal resistance are connected in series or in parallel to form a second battery pack 40.

[0067] The battery pack in this application is a secondary battery, also known as a rechargeable battery or accumulator, which refers to a battery that can be recharged after discharge to activate the active materials and continue to be used. Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During battery charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrode plates, inserting and extracting. The separator is positioned between the positive and negative electrode plates, primarily to prevent short circuits and allow active ions to pass through. The electrolyte is positioned between the positive and negative electrode plates, primarily to conduct active ions. As an example, the preparation process of a secondary battery is as follows: the positive electrode, separator, and negative electrode are stacked in sequence, with the separator positioned between the positive and negative electrode plates to provide isolation; then, the electrode assembly is obtained by winding or stacking; the electrode assembly is placed in the outer casing, dried, and then injected with electrolyte; after vacuum sealing, settling, formation, and shaping, the secondary battery is obtained.

[0068] The electrical devices covered in this application include, but are not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. When the electrical device is a vehicle, the battery pack can be located at the bottom, front, or rear of the vehicle.

[0069] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The battery housing (10) includes a frame (11) and a base plate (12) connected to the frame (11), the frame (11) and the base plate (12) forming a receiving cavity; A heat exchanger (20) is disposed within the receiving cavity. The heat exchanger (20) is connected to the frame (11) and / or the base plate (12). A first heat exchange channel (21) is provided within the heat exchanger (20). In a plane perpendicular to the length direction of the heat exchanger (20), the cross-sectional area of ​​the first heat exchange channel (21) is S1 mm. 2 The cross-sectional area of ​​the heat exchanger (20) is S2mm. 2 The relationship satisfies: 0.3 ≤ S1mm 2 / S2mm 2 ≤0.98; The first battery pack (30) and the second battery pack (40) are respectively disposed on both sides of the heat exchanger (20); the first battery pack (30) includes a first battery cell (31), the first battery cell (31) having a first surface (311) with the largest surface area; the second battery pack (40) includes a second battery cell (41), the second battery cell (41) having a second surface (411) with the largest surface area, and both the first surface (311) and the second surface (411) are disposed facing the heat exchanger (20).

2. The battery pack according to claim 1, characterized in that, The cross-sectional area of ​​the first heat exchange channel (21) is S1mm. 2 The cross-sectional area of ​​the heat exchanger (20) is S2mm. 2 The relationship satisfies: 0.5 ≤ S1mm 2 / S2mm 2 ≤0.

8.

3. The battery pack according to claim 1, characterized in that, The cross-sectional area of ​​the first heat exchange channel (21) is S1mm. 2 Meets the requirement of 192mm 2 ≤S1mm 2 ≤6140mm 2 .

4. The battery pack according to claim 1, characterized in that, The heat exchanger (20) has a cross-sectional area of ​​S2mm. 2 Meets the requirement of 600mm 2 ≤S1mm 2 ≤6250mm 2 .

5. The battery pack according to claim 1, characterized in that, The first surface (311) is in contact with the heat exchanger (20), and the second surface (411) is in contact with the heat exchanger (20).

6. The battery pack according to claim 1, characterized in that, The first surface (311) has a first preset gap with the heat exchanger (20), and the second surface (411) has a second preset gap with the heat exchanger (20).

7. The battery pack according to claim 6, characterized in that, The distance L1mm of the first preset gap satisfies: 1.0mm≤L1mm≤5.0mm.

8. The battery pack according to claim 6, characterized in that, The distance L2mm of the second preset gap satisfies: 1.0mm≤L2mm≤5.0mm.

9. The battery pack according to claim 6, characterized in that, The battery pack also includes a first thermally conductive structural adhesive layer disposed within the first preset gap.

10. The battery pack according to claim 6, characterized in that, The battery pack also includes a second thermally conductive structural adhesive layer disposed within the second preset gap.

11. The battery pack according to claim 6, characterized in that, The relationship between the distance L1mm of the first preset gap and the distance L2mm of the second preset gap is: L1mm=L2mm.

12. The battery pack according to claim 6, characterized in that, The relationship between the distance L1mm of the first preset gap and the distance L2mm of the second preset gap satisfies: L1mm < L2mm, and the battery pack further includes a second thermally conductive structural adhesive layer disposed within the second preset gap.

13. The battery pack according to claim 1, characterized in that, The first surface (311) is in contact with the heat exchanger (20), and the second surface (411) has a second preset gap with the heat exchanger (20). The battery pack also includes a second thermally conductive adhesive layer disposed in the second preset gap.

14. The battery pack according to claim 1, characterized in that, The heat exchanger (20) is a partition beam. The partition beam is disposed in the receiving cavity and divides the receiving cavity into a first receiving cavity and a second receiving cavity. The first battery pack (30) is disposed in the first receiving cavity, and the second battery pack (40) is disposed in the second receiving cavity.

15. The battery pack according to claim 14, characterized in that, The partition beam is provided with a first heat exchange channel (21), which includes a first channel (211) and a second channel (212). The first end of the first channel (211) is correspondingly disposed and isolated from the first end of the second channel (212). The second end of the first channel (211) is correspondingly disposed and connected to the second end of the second channel (212).

16. The battery pack according to claim 15, characterized in that, The flow area of ​​the first flow channel (211) is equal to the flow area of ​​the second flow channel (212).

17. The battery pack according to claim 15, characterized in that, The first heat exchange channel (21) further includes a third channel, the first end of the second channel (212) and the first end of the third channel are respectively disposed, the second end of the second channel (212) and the second end of the third channel are respectively disposed; the first end of the second channel (212) is connected to the first end of the third channel.

18. The battery pack according to claim 17, characterized in that, The flow area of ​​the second flow channel (212) is equal to the flow area of ​​the third flow channel.

19. The battery pack according to claim 14, characterized in that, The wall thickness Dmm of the partition beam satisfies: 0.2mm≤Dmm≤2.0mm.

20. The battery pack according to claim 14, characterized in that, The distance between the surface of the separator beam facing away from the base plate (12) and the base plate (12) is greater than the distance between the surface of the first battery cell (31) facing away from the base plate (12) and the base plate (12).

21. The battery pack according to claim 14, characterized in that, The distance between the surface of the separator beam facing away from the base plate (12) and the base plate (12) is less than the distance between the surface of the first battery cell (31) facing away from the base plate (12) and the base plate (12).

22. The battery pack according to claim 14, characterized in that, The distance between the surface of the separator beam facing away from the base plate (12) and the base plate (12) is equal to the distance between the surface of the first battery cell (31) facing away from the base plate (12) and the base plate (12).

23. The battery pack according to claim 1, characterized in that, The first battery pack (30) and the second battery pack (40) are arranged opposite each other on both sides of the heat exchanger (20) along a preset direction; the first battery pack (30) includes a plurality of first battery cells (31) arranged along the preset direction, and the plurality of first surfaces (311) of the plurality of first battery cells (31) are arranged in parallel.

24. The battery pack according to claim 1, characterized in that, The first battery pack (30) and the second battery pack (40) are arranged opposite each other on both sides of the heat exchanger (20) along a preset direction; the second battery pack (40) includes a plurality of second battery cells (41) arranged along the preset direction, and the plurality of second surfaces (411) of the plurality of second battery cells (41) are arranged in parallel.

25. The battery pack according to claim 1, characterized in that, The base plate (12) is a heat exchange plate, and a second heat exchange channel is provided inside the heat exchange plate.

26. An electrical device comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 25.

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