Battery pack and electric device

Abstract

Provided in the present application are a battery pack and an electric device. The battery pack comprises a plurality of liquid cooling plates, a plurality of side frames, and a plurality of battery modules, wherein the plurality of liquid cooling plates are sequentially arranged at intervals in the direction of gravity; the side frame is provided between every two adjacent liquid cooling plates, and two ends of each side frame are both connected to two liquid cooling plates; the plurality of side frames and the plurality of liquid cooling plates form a plurality of battery compartments by means of enclosing; and the plurality of battery modules are separately mounted in the plurality of battery compartments, and the two ends of each battery module facing away from each other in the direction of gravity are both in thermal conductive connection with the liquid cooling plates.

Description

Battery packs and electrical equipment

[0001] This application claims priority to Chinese patent applications filed with the Chinese Patent Office on December 31, 2024, with application numbers 202423320168.9, 202423318696.0, 202423320186.7 and 202423319326.9, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electrical equipment technology, specifically to battery packs and electrical equipment. Background Technology

[0003] A battery pack typically includes a housing and battery modules housed within the housing. To improve the energy density of the battery pack, a double-layer battery module is usually installed inside the housing. The double-layer battery module includes an upper battery module and a lower battery module. The upper battery module requires a middle support plate for support and an upper liquid cooling plate for cooling, while the lower battery module requires a bottom support plate for support and a lower liquid cooling plate for cooling. Invention Overview

[0004] The design of the dual-layer battery module results in a complex internal structure of the battery pack and uneven heat dissipation.

[0005] Firstly, a battery pack is provided, including...

[0006] Multiple liquid cooling plates are arranged at intervals along the direction of gravity;

[0007] Multiple side frames are provided between two adjacent liquid cooling plates. Each side frame is connected to two liquid cooling plates at both ends. Multiple side frames and multiple liquid cooling plates are used together to form multiple battery compartments.

[0008] Multiple battery modules are installed in multiple battery compartments, and the two ends of the battery modules that are opposite each other along the direction of gravity are thermally connected to the corresponding liquid cooling plates.

[0009] Secondly, embodiments of this application provide an electrical device, including a battery pack. Beneficial effects

[0010] In the embodiments of this application, the liquid cooling plates and side frames together form multiple battery compartments. This structure provides a stable support frame for the battery modules, thereby simplifying the internal structure of the battery pack. Since the battery modules are all enclosed by the side frames, the side frames can effectively resist the expansion forces generated by thermal expansion and contraction during charging and discharging, reducing damage or deformation caused by expansion. Both ends of each liquid cooling plate are cooled, which helps reduce the temperature gradient inside the battery module, resulting in uniform heat dissipation across multiple battery modules and improving the working efficiency and lifespan of the battery modules. Uniform temperature distribution not only improves the working efficiency of the battery modules but also reduces inconsistencies in battery module performance caused by temperature differences. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the battery pack structure provided by a possible implementation of this application;

[0012] Figure 2 is a cross-sectional schematic diagram of the battery pack structure shown in Figure 1 (first view);

[0013] Figure 3 is a magnified view of part A shown in Figure 2;

[0014] Figure 4 is a cross-sectional view of the side frame, liquid cooling plate and cover shown in Figure 1 after assembly.

[0015] Figure 5 is a magnified view of part B shown in Figure 4;

[0016] Figure 6 is a structural schematic diagram of the second side frame provided by a possible implementation of this application;

[0017] Figure 7 is a schematic diagram of the side frame structure provided by a possible implementation of this application;

[0018] Figure 8 is a magnified view of part C shown in Figure 7;

[0019] Figure 9 is a cross-sectional view of the side frame shown in Figure 7;

[0020] Figure 10 is a magnified view of part D shown in Figure 9;

[0021] Figure 11 is a schematic diagram of the reinforcement structure provided by a possible implementation of this application;

[0022] Figure 12 is a structural schematic diagram of the longitudinal beam provided in a possible implementation of this application.

[0023] Figure 13 is a cross-sectional view of the battery pack shown in Figure 1;

[0024] Figure 14 is a magnified view of part E shown in Figure 1;

[0025] Figure 15 is a cross-sectional schematic diagram (second view) of a possible implementation of the present application, showing a portion of the battery pack structure.

[0026] Figure 16 is a magnified view of part F shown in Figure 15;

[0027] Figure 17 is a structural schematic diagram of the battery pack section shown in Figure 1;

[0028] Figure 18 is a cross-sectional view (third view) of the battery pack structure shown in Figure 17;

[0029] Figure 19 is a magnified view of the part at point G shown in Figure 18;

[0030] Explanation of reference numerals in the attached figures:

[0031] 100. Battery pack; 10. Liquid cooling plate; 11. First liquid cooling plate; 12. Second liquid cooling plate; 13. Third liquid cooling plate; 131. Sub-liquid cooling plate; 132. First side surface; 133. Second side surface; 14. Mounting hole; 15. First threaded hole; 16. Third groove; 20. Side frame; 21. First side frame; 22. Second side frame; 221. Through hole; 222. Expansion beam; 23. Side beam; 24. Longitudinal beam; 241. Connecting part; 242. Protrusion; 243. Second side wall; 244. Insertion hole; 2441. Sub-hole; 25. Reinforcing component; 251. Connecting seat; 2511. Welding hole; 252. Insertion part; 2521. First side wall; 2522. Fourth groove; 2523. Protrusion; 26. Third through hole; 30. Battery module; 31. Battery cell; 40. End plate; 41. Maintenance window; 51. Battery compartment; 52. First electrical compartment; 53. Second electrical compartment; 61. First electrical component; 62. Second electrical component; 70. Cover part; 71. Cover body; 72. Connecting body; 80. Cover plate; 90. Connector; 91. Third screwed component; 110. Reinforcing member; 1101. First screwed component; 120. Elastic heat-conducting part; 130. First heat-conducting component; 140. Heating part; 141. Heating plate; 1411. First heating plate; 1412. Second heating plate; 150. Second screwed component; 161. First through hole; 162. Second through hole; 171. Second threaded hole; 172. Third threaded hole; 180. Second heat-conducting component. Embodiments of the present invention

[0032] A battery pack typically consists of a housing and battery modules housed within the housing. To improve the energy density of the battery pack, a double-layer battery module is usually installed inside the housing. The double-layer battery module consists of an upper battery module and a lower battery module. The upper battery module requires a middle support plate for support and an upper liquid cooling plate for cooling, while the lower battery module requires a bottom support plate for support and a lower liquid cooling plate for cooling. This design results in a complex internal structure of the battery pack and uneven heat dissipation in the double-layer battery module.

[0033] In view of this, this application proposes a battery pack. Figures 1 to 19 are schematic structural diagrams of embodiments of the battery pack provided in this application. The battery pack provided in this application simplifies the internal structure of the battery pack and makes the heat dissipation of the multiple battery modules inside the battery pack more uniform. The battery pack will be described in detail below with reference to the main accompanying drawings.

[0034] Referring to Figures 1 to 4, the battery pack 100 includes multiple liquid cooling plates 10, multiple side frames 20, and multiple battery modules 30, which are arranged sequentially at intervals along the direction of gravity. A side frame 20 is provided between each two adjacent liquid cooling plates 10. Both ends of each side frame 20 are connected to the two liquid cooling plates 10. The multiple side frames 20 and the multiple liquid cooling plates 10 together form multiple battery compartments 51. The multiple battery modules 30 are respectively installed in the multiple battery compartments 51, and the two ends of the battery modules 30 that are set opposite to each other along the direction of gravity are thermally connected to the corresponding liquid cooling plates 10.

[0035] In the embodiments of this application, the liquid cooling plate 10 and the side frame 20 together form multiple battery compartments 51. This structure provides a stable support frame for the battery module 30, thereby simplifying the internal structure of the battery pack 100. Since the battery modules 30 are all surrounded by the side frame 20, the side frame 20 can effectively resist the expansion force generated by the thermal expansion and contraction of the battery modules 30 during charging and discharging, reducing damage or deformation of the battery modules 30 caused by expansion. Both ends of each liquid cooling plate 10 are cooled by the liquid cooling plate 10, which helps to reduce the temperature gradient inside the battery module 30, making the heat dissipation of multiple battery modules 30 uniform, improving the working efficiency and lifespan of the battery modules 30. Uniform temperature distribution can not only improve the working efficiency of the battery modules 30, but also reduce the inconsistency in the performance of the battery modules 30 caused by temperature differences.

[0036] Referring to Figures 2 and 4, in some embodiments, the plurality of liquid cooling plates 10 include a first liquid cooling plate 11 located at its lowest point along the direction of gravity, and the plurality of side frames 20 include a first side frame 21 mounted on the side of the first liquid cooling plate 11 away from the direction of gravity. The battery pack 100 also includes an end plate 40 and a first electrical component 61. The end plate 40 is located on the side of the first side frame 21 away from the battery compartment 51. The end plate 40, side frames 20, and first liquid cooling plate 11 together form a first electrical compartment 52, and the first electrical component 61 is mounted in the first electrical compartment 52. In this way, the first liquid cooling plate 11 can cool the battery module 30 in the battery compartment 51 while also cooling the first electrical component 61 in the electrical compartment, improving the cooling efficiency of the first liquid cooling plate 11, reducing the number of cooling components required, and thus reducing cost and complexity. The first electrical compartment 52 provides additional protection for the electrical component, preventing it from being damaged by dust, moisture, or other external contaminants.

[0037] Referring to Figures 2, 4, and 6, in some embodiments, the plurality of liquid cooling plates 10 include a second liquid cooling plate 12 connected to the first side frame 21, and the plurality of side frames 20 further include at least two second side frames 22. The plurality of second side frames 22 are connected to the side of the second liquid cooling plate 12 opposite to the direction of gravity, and the plurality of second side frames 22 are spaced apart. A battery module 30 is installed in each second side frame 22. In this way, the second liquid cooling plate 12 can simultaneously cool the battery module 30 in the first side frame 21 and the battery module 30 in the second side frame 22, making the heat distribution in the battery pack 100 more uniform, helping to reduce local overheating and improve the overall heat dissipation efficiency. The plurality of second side frames 22 are connected to the second liquid cooling plate 12 to form a stable support structure. This design helps to resist the deformation and damage of the battery pack 100 when subjected to external impact or vibration. By installing the battery module 30 inside the second side frame 22 and connecting it to the second liquid cooling plate 12, the second side frame 22 can resist the expansion force of the battery module 30 inside, reducing damage or deformation of the battery module 30 caused by expansion. Each second side frame 22 has a battery module 30 installed inside. This design facilitates the installation, maintenance and replacement of the battery module 30, reduces the overall maintenance cost of the battery pack 100, and facilitates heat dissipation of the battery module 30 inside the second side frame 22.

[0038] It should be noted that the number of battery modules 30 installed in the second side frame 22 can be set as needed. For example, one, two or more battery modules 30 can be set in the second side frame 22. For example, this application does not limit this.

[0039] Referring to Figures 2 and 4, in some embodiments, the plurality of liquid cooling plates 10 further includes a third liquid cooling plate 13. The third liquid cooling plate 13 includes a plurality of distributed liquid cooling plates 131, which are arranged one-to-one with a plurality of second side frames 22. Each distributed liquid cooling plate 131 is connected to the side of the corresponding second side frame 22 facing away from the second liquid cooling plate 12. In this way, each second side frame 22 corresponds to one distributed liquid cooling plate 131, ensuring that the battery modules 30 within the second side frame 22 can be adequately cooled. This design avoids local heat accumulation within the battery pack 100, resulting in a more uniform heat distribution and improved overall heat dissipation efficiency. The flow path of the coolant within the distributed liquid cooling plates 131 is shorter, reducing flow resistance and enabling the heat dissipation system to respond to temperature changes more quickly. When it is necessary to add battery modules 30, only the corresponding second side frames 22 and distributed liquid cooling plates 131 need to be added, without the need for large-scale modifications to the entire battery pack 100. This design improves the flexibility and scalability of the battery pack 100, enabling it to adapt to possible future changes. The design of the liquid cooling plate 131 allows each battery module 30 to be cooled independently, reducing the risk of system failure due to local overheating. This design improves the overall reliability of the battery pack 100, enabling it to operate stably in a variety of harsh environments.

[0040] Referring to Figures 1 and 15, in some embodiments, the battery pack 100 further includes a cover portion 70. The cover portion 70 is located on the side of the first side frame 21 opposite to the direction of gravity, and its periphery is connected to the periphery of the first side frame 21. The third liquid cooling plate 13, the second side frame 22, and the second liquid cooling plate 12 are all located within the cover portion 70. Thus, the design of the cover portion 70 protects the third liquid cooling plate 13, the second side frame 22, the second liquid cooling plate 12, and the battery module 30, reducing the risk of damage to the battery pack 100. The tight connection between the cover portion 70 and the first side frame 21 helps prevent external impurities such as moisture and dust from entering the battery pack 100, protecting the internal components of the battery pack 100 from damage. The third liquid cooling plate 13 and the second liquid cooling plate 12 are placed inside the cover portion 70, which can more effectively exchange heat with the cells 31 inside the battery pack 100. This design helps to quickly remove the heat generated by the battery module 30, reduce the temperature of the battery module 30, and improve the performance and life of the battery module 30.

[0041] Referring to Figures 4 and 15, in some embodiments, the cover 70 and the second liquid cooling plate 12 together enclose a second electrical compartment 53. The battery pack 100 also includes a second electrical component 62, which is installed within the second electrical compartment 53 and electrically connected to the battery module 30 located within the second side frame 22. This reduces the length and complexity of the electrical connection lines between the second electrical component 62 and the battery module 30 installed within the second side frame 22, thus lowering the risk of electrical failure. The second electrical compartment 53 provides additional protection for the second electrical component 62, preventing it from being damaged by dust, moisture, or other external contaminants. The second liquid cooling plate 12 not only serves as part of the second electrical compartment 53 but also performs a heat dissipation function. This design improves the overall compactness of the battery pack 100 structure. The design of the second electrical compartment 53 allows for easy opening of the cover for inspection and maintenance of the second electrical component 62 when maintenance is required, simplifying the operation.

[0042] Referring to Figures 1 and 15, in some embodiments, the enclosure 70 includes multiple covers 71 and connecting bodies 72. Each cover 71 corresponds to one of the multiple second side frames 22. Each cover 71 is configured to cover the corresponding second side frame 22 and the liquid cooling plate 131. The connecting body 72 surrounds the periphery of the multiple covers 71 and is connected to one end of each cover 71 adjacent to the second liquid cooling plate 12. The periphery of the connecting body 72 is connected to the periphery of the first side frame 21. This creates a gap between adjacent covers 71, providing installation space for subsequent installation of other components. Simultaneously, these gaps can serve as heat dissipation channels, promoting heat dissipation from the battery module 30 installed within the cover 71. The covers 71 effectively cover the corresponding second side frame 22 and the liquid cooling plate 131, providing protection and isolation to prevent external contaminants (such as dust and moisture) from entering. The connecting body 72 surrounds the periphery of the multiple covers 71 and is connected to the covers 71 and the first side frame 21 to form a stable structural frame. This design not only enhances the overall structural strength of the cover part 70, but also connects the multiple covers 71 into one unit, simplifying the installation and disassembly of the multiple covers 71.

[0043] Referring to Figures 1 and 7, in some embodiments, a maintenance window 41 is provided on the side of the end plate 40. The maintenance window 41 is connected to the first electrical compartment 52. This allows maintenance personnel to directly observe the interior of the first electrical compartment 52, thus facilitating faster location of any abnormalities. The detachable connection between the cover plate 80 and the end plate 40 allows maintenance personnel to easily open the cover plate 80 and enter the first electrical compartment 52 for maintenance and inspection without disassembling the entire battery pack 100, significantly saving maintenance time and costs. The cover plate 80 also provides some protection, preventing external debris from entering the first electrical compartment 52 and damaging the internal components of the battery pack 100.

[0044] Referring to Figures 7 to 10, in some embodiments, the side frame 20 includes two side beams 23, multiple longitudinal beams 24, and multiple reinforcing members 25. The two side beams 23 are arranged opposite to each other and spaced apart along a first direction, and each side beam 23 extends along a second direction. The first direction, the second direction, and the gravity direction intersect each other. The multiple longitudinal beams 24 are arranged spaced apart along the second direction. In this way, the cross arrangement allows the frame to form a stable support structure in both directions, effectively improving the stability of the overall frame structure. Each longitudinal beam 24 extends along a first direction. Multiple reinforcing members 25 are positioned at the ends of the longitudinal beams 24. Each reinforcing member 25 includes a connecting seat 251 and a plug-in portion 252 protruding from the connecting seat 251. The connecting seat 251 is fixedly connected to the side beam 23, and the plug-in portion 252 is plugged into the end of the corresponding longitudinal beam 24. The plug-in portion 252 has two first sidewalls 2521 arranged opposite to each other along a second direction. The two first sidewalls 2521 are fixedly connected to the corresponding longitudinal beam 24 via multiple connectors 90. Thus, the reinforcing members 25 are positioned at the ends of the longitudinal beams 24 and fixedly connected to the side beams 23 via the connecting seats 251, thereby fixing the position of the connecting seats 251. The plug-in engagement of the plug-in portion 252 with the longitudinal beams 24 simplifies the assembly process and increases the contact area between the plug-in portion 252 and the longitudinal beams 24, increasing the connection strength between the longitudinal beams 24 and the side beams 23 and further improving the overall stability of the side frame 20 structure.

[0045] Furthermore, the connecting seat 251 of the reinforcement 25 is fixedly connected to the side beam 23, and the insertion part 252 is inserted into the longitudinal beam 24 and fixed with multiple connecting pieces 90. This design allows the reinforcement 25 to effectively transmit and disperse external forces, enhancing the bending and torsional resistance of the side frame 20, and enabling the side frame 20 to meet the structural strength requirements of the high-capacity battery pack 100. The insertion part 252 of the reinforcement 25 has two first sidewalls 2521 arranged opposite to each other along the second direction. The two first sidewalls 2521 are fixedly connected to the corresponding longitudinal beam 24 through multiple connecting pieces 90. This ensures a fixed connection between the insertion part 252 and the longitudinal beam 24, preventing separation of the insertion part 252 and the longitudinal beam 24, and improving the overall connection strength of the side frame 20. In addition, the two first sidewalls 2521 are arranged opposite to each other along the second direction, providing a large operating space when fixing the insertion part 252 to the corresponding longitudinal beam 24 through the connecting pieces 90, making the connection and fixing operation of the insertion part 252 and the longitudinal beam 24 simple.

[0046] Referring to Figures 8 and 10, in some embodiments, the connecting seat 251 is screwed to the side beam 23 via multiple second screw fasteners 150. This screw-on fixing method can withstand greater tensile and shear forces, ensuring the strength and stability of the connection between the connecting seat 251 and the side beam 23. The screw-on fixing has a self-locking function, effectively preventing loosening between the connecting seat 251 and the side beam 23 due to vibration or external forces. The screw-on fixing method is relatively simple and allows for quick connection between the connecting seat 251 and the side beam 23, improving installation efficiency. The screw-on fixing method also allows for disassembly and reassembly of the connecting seat 251 and the side beam 23 as needed.

[0047] It should be noted that the connection method between the connecting seat 251 and the side beam 23 can be selected as needed. For example, in some embodiments, the connecting seat 251 and the side beam 23 can also be fixed by screws and welding. This improves the stability of the connecting seat 251 and the side beam 23. In other embodiments, the connecting seat 251 and the side beam 23 can also be fixed by welding or pin connection. In other embodiments, the connecting seat 251 and the side beam 23 can also be fixed by welding and pin connection. Exemplarily, this application does not limit this.

[0048] Referring to Figures 8 and 10, in some embodiments, the plurality of connectors 90 include a plurality of third screw connectors 91. Each third screw connector 91 fixes the first sidewall 2521 to the corresponding longitudinal beam 24. This screw-on fixing method can withstand greater tensile and shear forces, ensuring the strength and stability of the connection between the insertion part 252 and the longitudinal beam 24. The screw-on fixing has a self-locking function, effectively preventing loosening between the insertion part 252 and the longitudinal beam 24 due to vibration or external forces. The screw-on fixing method is relatively simple and can quickly achieve the connection between the insertion part 252 and the longitudinal beam 24, improving installation efficiency. The screw-on fixing method allows the insertion part 252 and the longitudinal beam 24 to be disassembled as needed.

[0049] It should be noted that the connection method between the plug-in portion 252 and the longitudinal beam 24 can be selected as needed. For example, in some embodiments, the plug-in portion 252 and the longitudinal beam 24 can also be fixed by screws or welding. This improves the stability of the plug-in portion 252 and the longitudinal beam 24. In other embodiments, the plug-in portion 252 and the longitudinal beam 24 can also be fixed by welding or connected by a pin. In other embodiments, the plug-in portion 252 and the longitudinal beam 24 can also be fixed by welding and connected by a pin. Exemplarily, this application does not limit this.

[0050] Referring to Figures 11 and 12, in some embodiments, the longitudinal beam 24 has two second sidewalls 243 arranged opposite each other along a third direction. Each second sidewall 243 has a plurality of first through holes 161 extending along a third direction, and each first sidewall 2521 has a plurality of second threaded holes 171 extending along a third direction. The plurality of second threaded holes 171 correspond one-to-one with the plurality of first through holes 161. The threaded ends of a plurality of third threaded connectors 91 pass through the plurality of first through holes 161 and are threadedly connected to the corresponding plurality of second threaded holes 171. In this way, the threaded fixing method can withstand greater tensile and shear forces, ensuring the strength and stability of the connection between the plug-in part 252 and the longitudinal beam 24. The threaded fixing has a self-locking function, which can effectively prevent the plug-in part 252 and the longitudinal beam 24 from loosening due to vibration or external force. The threaded fixing method is relatively simple and can quickly realize the connection between the plug-in part 252 and the longitudinal beam 24, improving installation efficiency. The threaded fixing method allows the plug-in part 252 and the longitudinal beam 24 to be disassembled as needed.

[0051] Referring to Figure 10, in some embodiments, the diameter of the first through hole 161 decreases at least partially along the direction from the second sidewall 243 to the first sidewall 2521. The third screw connector 91 includes a first tapered countersunk bolt. The threaded end of the first tapered countersunk bolt is adapted to be threaded into the second threaded hole 171, and the head of the first tapered countersunk bolt is adapted to be recessed into the first through hole 161. Thus, the head of the first tapered countersunk bolt is designed to be tapered, which can fit into the first through hole 161 with decreasing diameter. When the bolt is installed in place, the head of the first tapered countersunk bolt can be recessed into the hole and will not protrude from the surface of the second sidewall 243, thereby achieving an aesthetically pleasing assembly effect. Since the head of the first tapered countersunk bolt does not protrude from the surface of the second sidewall 243, safety hazards such as scratches and collisions caused by the bolt head during use can be avoided. The countersunk design allows the head of the first tapered countersunk bolt to form a tighter contact with the second sidewall 243, which helps to enhance the stability of the connection and prevent the first tapered countersunk bolt from loosening due to vibration or external force. The compatibility between the head of the first tapered countersunk bolt and the first through hole 161 makes it easier to align the first tapered countersunk bolt with the threaded hole during installation, improving installation efficiency. Because the head of the first tapered countersunk bolt can be recessed into the first through hole 161, the utilization rate of the space enclosed by the second side frame 22 is improved.

[0052] Referring to Figure 10, in some embodiments, a fourth groove 2522 is provided at the end of the plug portion 252 away from the connector 251. The fourth groove 2522 communicates with a plurality of second threaded holes 171. Thus, due to the presence of the fourth groove 2522, installers can more easily pass the third screw 91 through the corresponding second threaded hole 171 and quickly complete the tightening operation, thereby improving installation efficiency. The design of the fourth groove 2522 helps reduce stress concentration in the plug portion 252 during the connection process. When the third screw 91 is tightened, the fourth groove 2522 can disperse some of the stress, thereby reducing the risk of cracking or damage to the plug portion 252. The presence of the fourth groove 2522 can reduce the weight of the fastener.

[0053] Referring to Figures 8 and 10, in some embodiments, the connecting seat 251 is provided with a plurality of second through holes 162 extending along a second direction. These second through holes 162 are located on both sides of the insertion portion 252 along a third direction. Each side beam 23 is provided with a plurality of third threaded holes 172 corresponding to the plurality of second through holes 162. The threaded ends of the plurality of second threaded members 150 pass through the plurality of second through holes 162 and are threadedly connected to the corresponding plurality of third threaded holes 172. Thus, the threaded fixing method can withstand greater tensile and shear forces, ensuring the strength and stability of the connection between the connecting seat 251 and the side beam 23. The threaded fixing has a self-locking function, effectively preventing loosening between the connecting seat 251 and the side beam 23 due to vibration or external forces. The threaded fixing method is relatively simple and can quickly achieve the connection between the connecting seat 251 and the side beam 23, improving installation efficiency. The threaded fixing method allows the connecting seat 251 and the side beam 23 to be disassembled as needed.

[0054] Referring to Figure 10, in some embodiments, the diameter of the second through hole 162 decreases at least partially along the direction from the insertion part 252 to the connecting seat 251. The third screw connector 91 includes a second tapered countersunk bolt, the threaded end of which is adapted to be threaded into the third threaded hole 172. The head of the first tapered countersunk bolt is adapted to be recessed into the second through hole 162. Thus, the head of the second tapered countersunk bolt is designed to be tapered, which can fit into the second through hole 162 with a decreasing diameter. When the second tapered countersunk bolt is installed in place, its head can be recessed into the hole and will not protrude from the surface of the connecting seat 251, thereby achieving an aesthetically pleasing assembly effect. Since the head of the second tapered countersunk bolt does not protrude from the surface of the connecting seat 251, safety hazards such as scratches and collisions caused by the head of the second tapered countersunk bolt during use can be avoided. Because the head of the second tapered countersunk bolt matches the decreasing diameter design of the second through hole 162, when the second tapered countersunk bolt is tightened, its head fits more tightly against the inner wall of the second through hole 162, thereby enhancing the stability and reliability of the connection between the side beam 23 and the connecting seat 251. The tapered head design of the second tapered countersunk bolt helps to disperse stress during the connection process, reducing the risk of cracking or damage to the connection part 241 due to stress concentration. The compatibility between the head of the second tapered countersunk bolt and the second through hole 162 makes it easier to align the second tapered countersunk bolt with the third threaded hole 172 during installation, improving installation efficiency. Since the head of the second tapered countersunk bolt can be recessed into the second through hole 162, the utilization rate of the space enclosed by the second side frame 22 is improved.

[0055] Referring to Figure 11, in some embodiments, the connecting seat 251 is further provided with a plurality of welding holes 2511 along the second direction. The plurality of welding holes 2511 are distributed on both sides of the insertion portion 252 along the third direction. The plurality of welding holes 2511 are adjacent to the periphery of the side beam 23 and are designed to be welded and fixed to the side beam 23. In this way, the connection strength between the connecting seat 251 and the side beam 23 is improved, so that the frame edge can withstand greater loads and vibrations. The welding holes 2511 are distributed on both sides of the insertion portion 252 along the third direction, which helps to disperse the stress during the welding process between the connecting seat 251 and the side beam 23 and avoid connection failure caused by stress concentration.

[0056] In some embodiments, the periphery of the connecting seat 251 is welded to the side beam 23, thereby increasing the connection strength between the connecting seat 251 and the side beam 23, enabling the frame edge to withstand larger loads and vibrations. Fixing the periphery of the connecting seat 251 to the side beam 23 by welding effectively prevents displacement or deformation of the connecting seat 251 during use, thus ensuring the stability of the entire structure. The welded connection has good long-term stability, ensuring that the connection between the connecting seat 251 and the side beam 23 remains firmly in place.

[0057] It should be noted that the feature of welding the periphery of the welding hole 2511 to the side beam 23 and the feature of welding the periphery of the connecting seat 251 to the side beam 23 can be set separately or simultaneously. When set simultaneously, the connection between the connecting seat 251 and the side beam 23 is stable and firm.

[0058] The method of connecting the end of the longitudinal beam 24 and the plug-in part 252 can be selected as needed. Referring to Figures 11 and 12, in some embodiments, the end of the longitudinal beam 24 is provided with a plug-in hole 244, the plug-in part 252 is inserted into the plug-in hole 244, and the connecting seat 251 abuts against the end of the longitudinal beam 24. The matching design of the plug-in hole 244 and the plug-in part 252 makes the connection process between the plug-in part 252 and the longitudinal beam 24 simple and quick, thereby improving the connection efficiency. The tight fit between the plug-in hole 244 and the plug-in part 252 increases the contact area between the longitudinal beam 24 and the plug-in part 252, which can ensure the stability and reliability of the connection part 241 of the plug-in hole 244 and the plug-in part 252, and prevent structural failure at the connection point of the plug-in hole 244 and the plug-in part 252. The plug-in connection design helps to disperse the stress at the connection part 241, avoid structural damage caused by stress concentration, and thus improve the overall structural stability of the side frame 20. The mating design of the insertion hole 244 and the insertion part 252 ensures the precise positioning of the connecting part 241, avoiding deviations or misalignments during the connection process. Precise mating and positioning help improve the assembly quality of the side frame 20, ensuring the robustness and reliability of the connecting part 241.

[0059] In other embodiments, the end of the insertion portion 252 may be provided with an insertion hole 244, and the longitudinal beam 24 may be inserted into the insertion hole 244. In other embodiments, the insertion portion 252 may be provided with a first insertion hole 244, and the longitudinal beam 24 may be provided with a second insertion hole 244, with the end of the longitudinal beam 24 inserted into the first insertion hole 244 and the end of the insertion portion 252 inserted into the second insertion hole 244. This application is not limited to these embodiments.

[0060] Referring to Figure 7, in some embodiments, the longitudinal beam 24 includes a connecting portion 241 and two protrusions 242. The connecting portion 241 abuts against the liquid cooling plate 10 and has two first sides disposed opposite to each other along a second direction. The two protrusions 242 protrude from the two first sides, and each protrusion 242 is welded to the liquid cooling plate 10. Thus, by providing the protrusions 242, when the longitudinal beam 24 is welded to the liquid cooling plate 10, the welding mainly occurs between the protrusions 242 and the liquid cooling plate 10. Since the protrusions 242 are relatively thin and have a small heat capacity, they can easily heat up and reach the melting temperature, thereby forming a weld. This ensures that when the longitudinal beam 24 reaches the required penetration depth, the temperature rise of the liquid cooling plate 10 remains within the allowable range, avoiding the risk of overheating and burn-through. In this way, a balance can be achieved between the welding penetration depth of the longitudinal beam 24 and the requirement that the liquid cooling plate 10 is not burned through, reducing the risk of burn-through of the liquid cooling plate 10 and improving the welding quality.

[0061] In some embodiments, the size of the protrusion 242 in the thickness direction of the liquid cooling plate 10 is within H3, where 1.5mm ≤ H3 ≤ 2.5mm. Thus, the size range of the protrusion 242 in the thickness direction of the liquid cooling plate 10 has a significant impact on the welding effect. If the size of the protrusion 242 is too small, it may result in insufficient heat capacity during welding, making it difficult to form a stable weld, or the protrusion 242 may completely melt before reaching the required penetration depth of the side frame 20, affecting the welding quality. Conversely, if the size is too large, the heating rate of the protrusion 242 will be slower under the same welding energy, leading to a longer welding time and potentially conducting excessive heat to the liquid cooling plate 10, increasing the risk of burn-through. This size range was determined after comprehensively considering factors such as welding efficiency, penetration depth control, and protection of the liquid cooling plate 10. This helps to ensure that the temperature rise of the liquid cooling plate 10 is within the allowable range while meeting the penetration depth requirements of the side frame 20, thereby improving the welding success rate and quality.

[0062] It should be noted that the dimensions of the protrusion 242 in the thickness direction of the liquid cooling plate 10 can be 1.5mm, 1.6mm, 1.9mm, 2mm, 2.3mm, 2.4mm, or 2.5mm, etc. For example, this application does not limit this.

[0063] In the extension direction of the liquid cooling plate 10, the distance between the protrusion 242 and the connecting portion 241 is L, where 2mm≤L≤4mm. Thus, in the extension direction of the liquid cooling plate 10, the distance between the protrusion 242 and the connecting portion 241 has a significant impact on the achievement of technical effects and the connection strength between the side frame 20 and the liquid cooling plate 10. If the distance is too small, the proportion of heat conduction to the connecting portion 241 may increase, the temperature rise of the thicker connecting portion 241 may be slower, and the side frame 20 may not easily reach the required penetration depth. Correspondingly, the liquid cooling plate 10 may be at risk of weld burn-through. If the distance is too large, it will affect the compactness of the overall structure of the side frame 20, and it will be difficult to accurately control the heat accumulation in the protrusion 242 during welding, which may lead to uneven welding, affecting the weld quality and the penetration depth control of the side frame 20. It may also lead to uneven stress transmission between the liquid cooling plate 10 and the side frame 20 when subjected to external forces, thereby affecting the connection strength between the side frame 20 and the liquid cooling plate 10, and thus affecting the structural strength of the battery pack 100. Therefore, in the extension direction of the liquid cooling plate 10, the distance between the protrusion 242 and the connecting portion 241 is between 2mm and 4mm, which helps to control the heat concentration area during welding, ensures that the weld is mainly formed between the protrusion 242 and the liquid cooling plate 10, achieves the balance between the welding penetration of the side frame 20 and the liquid cooling plate 10 not being welded through, and ensures the connection strength between the liquid cooling plate 10 and the side frame 20, thereby ensuring the structural strength of the battery pack 100.

[0064] Referring to Figures 3 to 5, in some embodiments, the battery pack 100 further includes a reinforcing member 110, which is connected to at least two of the plurality of liquid cooling plates 10, thus ensuring a firm connection between the reinforcing member 110 and the at least two liquid cooling plates 10. The reinforcing member 110 is configured to support the side frame 20 between the at least two liquid cooling plates 10. This not only enhances the overall strength of the battery pack 100 but also directly and effectively supports the side frame 20 between the at least two liquid cooling plates 10. This design allows the side frame 20 between the at least two liquid cooling plates 10, the at least two liquid cooling plates 10, and the reinforcing member 110 to form a robust frame. This helps the side frame 20 resist the expansion force that may be generated by the cells 31 of the battery module 30 during charging and discharging, preventing deformation of the battery pack 100. It can also suppress damage or deformation of the battery module 30 due to excessive expansion of the cells 31, improve the overall mode of the battery pack 100, and ensure the stability and safety of the battery module 30 during long-term use.

[0065] It should be noted that the way the reinforcing member 110 supports the side frame 20 between at least two liquid cooling plates 10 can be selected as needed. For example, in some embodiments, the reinforcing member 110 can abut against the outer wall of the side frame 20 between at least two liquid cooling plates 10. In other embodiments, the reinforcing member 110 can abut against the outer wall of the side frame 20 between at least two liquid cooling plates 10. In the embodiments of this application, the side frame 20 between at least two liquid cooling plates 10 is provided with a third through hole 26. The reinforcing member 110 passes through the third through hole 26 of the side frame 20 between at least two liquid cooling plates 10, and both ends are threadedly connected to the at least two liquid cooling plates 10. In this way, the contact area between the reinforcing member 110 and the side frame 20 between at least two liquid cooling plates 10 is increased, making the connection between the reinforcing member 110 and the side frame 20 between at least two liquid cooling plates 10 tighter and stronger, thereby improving the strength and stability of the connection between the reinforcing member 110 and the side frame 20 between at least two liquid cooling plates 10. The design of the reinforcement 110 being partially inserted into the third through hole 26 helps to improve the structural rigidity of the side frame 20 between at least two liquid cooling plates 10, so that the side frame 20 between at least two liquid cooling plates 10 can better resist deformation when subjected to external forces, and can better resist the expansion force generated by the battery module 30 during charging and discharging, thereby ensuring the safety and stability of the battery module 30.

[0066] Referring to Figures 4 to 6, in some embodiments, the side frame 20 between at least two liquid cooling plates 10 includes a second side frame 22. The second side frame 22 is provided with a through hole 221, which is provided through the second side frame 22 along the direction of gravity. The reinforcing member 110 is provided corresponding to the through hole 221, and a portion of the reinforcing member 110 is inserted into the through hole 221. In this way, the contact area between the reinforcing member 110 and the second side frame 22 is increased, making the connection between the reinforcing member 110 and the second side frame 22 tighter and stronger, thereby improving the strength and stability of the connection between the reinforcing member 110 and the second side frame 22. The design of the reinforcing member 110 being partially inserted into the through hole 221 helps to improve the structural rigidity of the entire battery pack 100, so that the second side frame 22 can better resist deformation when subjected to external forces, and can better resist the expansion force generated by the cell 31 during charging and discharging, preventing the battery pack 100 from deforming, and suppressing the cell 31 from being damaged or deformed due to excessive expansion, thereby ensuring the safety and stability of the battery module 30 installed in the battery pack 100.

[0067] Referring to Figures 3 and 4, in some embodiments, at least two of the plurality of liquid cooling plates 10 connected to the reinforcing member 110 include a second liquid cooling plate 12 and a third liquid cooling plate 13. One of the third liquid cooling plate 13 and the second liquid cooling plate 12 is provided with a mounting hole 14, which corresponds to the through hole 221. The other of the third liquid cooling plate 13 and the second liquid cooling plate 12 is provided with a first threaded hole 15, which corresponds to the through hole 221. The reinforcing member 110 includes a first threaded connector 1101. The threaded end of the first threaded connector 1101 is adapted to pass through the mounting hole 14, the through hole 221 and the first threaded hole 15 and be threadedly connected. In this way, the reinforcing member 110 is tightly connected to the third liquid cooling plate 13 and the second liquid cooling plate 12 by the first threaded connector 1101, forming a strong mechanical connection. This connection method has higher connection strength and reliability than other non-threaded connection methods (such as welding, riveting, etc.) and can withstand greater external forces and vibration impacts. The threaded connection of the first screw connector 1101 not only enhances the strength of the connection point but also improves the structural rigidity of the entire battery pack 100. This rigid structure helps resist the pressure generated when the battery cell 31 expands, preventing the battery pack 100 from deforming or cracking. The threaded connection makes the installation and removal of the reinforcing member 110 relatively simple and convenient. When it is necessary to repair or replace the battery module 30, the reinforcing member 110 can be easily removed without damaging other parts of the battery pack 100.

[0068] It should be noted that the connection method between the two ends of the reinforcing member 110 and the second liquid cooling plate 12 and the third liquid cooling plate 13 can be selected as needed. For example, in some embodiments, the two ends of the reinforcing member 110 can be welded to the second liquid cooling plate 12 and the third liquid cooling plate 13. In other embodiments, the two ends of the reinforcing member 110 can also be glued to the second liquid cooling plate 12 and the third liquid cooling plate 13. Exemplarily, this application does not limit the connection method between the two ends of the reinforcing member 110 and the second liquid cooling plate 12 and the third liquid cooling plate 13.

[0069] Referring to Figure 2, in some embodiments, multiple reinforcing members 110 are provided, and the multiple reinforcing members 110 are arranged at intervals along the circumference of the second side frame 22. In this way, the multiple reinforcing members 110 arranged at intervals along the circumference of the second side frame 22 can effectively distribute the stress and pressure acting on the second side frame 22. This distribution method allows each reinforcing member 110 to bear a part of the load, thereby improving the strength and load-bearing capacity of the entire structure. The interval arrangement of multiple reinforcing members 110 enhances the rigidity of the second side frame 22, making it more resistant to deformation and bending, and making the entire battery pack 100 structure more resistant to the expansion force of the cell 31. This helps to prevent the cell 31 from being damaged or deformed due to expansion, thereby ensuring the safety and stability of the battery module 30 installed in the battery pack 100.

[0070] Referring to Figures 2 and 3, in some embodiments, the second side frame 22 includes two expansion beams 222 arranged opposite to each other, and a plurality of reinforcing members 110 are disposed on the two expansion beams 222. In this way, the battery cell 31 will generate an expansion force during charging and discharging, and the expansion force will act on the expansion beams 222. By combining the two oppositely arranged expansion beams 222 and the plurality of reinforcing members 110, the structural rigidity of the expansion beams 222 is enhanced, making them more resistant to deformation caused by the expansion of the battery cell 31.

[0071] It should be noted that the arrangement of the multiple reinforcing members 110 on the two expansion beams 222 can be selected as needed. For example, in some embodiments, at least a portion of the multiple reinforcing members 110 is located outside the first cavity and abuts against the opposite side of the two longitudinal beams 24. In some embodiments, at least a portion of the multiple reinforcing members 110 is located inside the first cavity and abuts against the side adjacent to the two longitudinal beams 24. In still other embodiments, a portion of the multiple reinforcing members 110 is located inside the first cavity and abuts against the side adjacent to the two longitudinal beams 24, while a portion of the multiple reinforcing members 110 is located outside the first cavity and abuts against the side opposite to the two longitudinal beams 24. In the embodiments of this application, the multiple reinforcing members 110 penetrate the two expansion beams 222 and are respectively fixedly connected to the second liquid cooling plate 12 and the third liquid cooling plate 13. Of course, in other embodiments, the plurality of reinforcing members 110 may be partially disposed through the two expansion beams 222, partially located inside the first cavity and abutting against the expansion beams 222, and partially located outside the first cavity and abutting against the expansion beams 222. Exemplarily, this application does not limit the manner in which the plurality of reinforcing members 110 are disposed on the two expansion beams 222.

[0072] Referring to Figures 2 and 3, in some embodiments, the side frame 20 between at least two liquid cooling plates 10 further includes a first side frame 21. A reinforcing member 110 is adapted to be connected to the first side frame 21. Thus, the connection between the reinforcing member 110 and the first side frame 21 significantly enhances the structural strength of the battery pack 100. During charging and discharging, the battery cell 31 generates expansion forces. The presence of the reinforcing member 110 can disperse and resist these expansion forces, preventing the battery pack 100 from deforming or cracking due to the expansion of the battery cell 31. By connecting the reinforcing member 110 to the first side frame 21, the stress inside the battery pack 100 can be distributed more rationally. This design helps reduce the concentration of local stress, making the battery pack 100 more stable when subjected to the expansion force of the battery cell 31. Under long-term exposure to the expansion force of the battery cell 31, the battery pack 100 can maintain its original shape and performance, extending its service life. The modal frequency of the battery pack 100 is an important indicator of its structural dynamic characteristics. The connection between the reinforcing member 110 and the first side frame 21 helps to increase the modal frequency of the battery pack 100, making it more resistant to vibration and impact caused by external excitation.

[0073] In some embodiments, the battery pack 100 further includes a filler that fills the gap between the side frame 20 and the battery module 30. This filler effectively fills the gap, making the overall structure of the battery pack 100 more compact and complete. This tight filling reduces voids and weak points in the structure, thereby improving the overall stiffness of the battery pack 100. Increased overall stiffness helps reduce the deformation of the battery pack 100 under vibration conditions, thus improving its modal characteristics, including natural frequency and damping ratio. When the battery pack 100 is subjected to external excitation, the filler can slow down the propagation speed of vibration waves in the structure, reducing the impact of vibration on the battery module 30. This reduction in vibration transmission helps protect the battery module 30 from vibration damage and extends its service life. The addition of the filler also improves the safety of the battery pack 100. In extreme cases such as collisions or compression, the filler can act as a buffer, reducing the impact of external impacts on the battery module 30. At the same time, the tight filling method also helps to prevent the battery module 30 from shifting or loosening under vibration conditions, thereby reducing the safety risks caused by structural failure.

[0074] It should be noted that the type of filler can be selected as needed. For example, in some embodiments, the filler may include foam, polyurethane, polypropylene or polyimide, etc., but this application does not limit it by way of example.

[0075] Referring to Figures 13 to 16, the battery module 30 has a top and a bottom along the thickness direction of the liquid cooling plate 10. The bottom of the battery module 30 is thermally connected to one of the two adjacent liquid cooling plates 10. The battery pack 100 also includes multiple elastic thermally conductive parts 120, and the top of each battery module 30 is thermally connected to the other of the two adjacent liquid cooling plates 10 through the elastic thermally conductive parts 120. The liquid cooling plate 10, through the internally flowing coolant, can effectively absorb and remove the large amount of heat generated by the battery module 30 during operation, ensuring that the battery module 30 is always kept within a suitable operating temperature range, avoiding the impact of overheating on the performance and lifespan of the battery pack 100. Since the liquid cooling plates 10 are arranged sequentially at intervals, the battery modules 30 between two adjacent liquid cooling plates 10 can be uniformly cooled. This design helps reduce the temperature difference between battery modules 30 and improves the temperature uniformity of the entire battery pack 100. The bottom of the battery module 30 is thermally connected to an adjacent liquid cooling plate 10, ensuring that the heat generated by the battery module 30 can be effectively transferred to the liquid cooling plate 10 for heat dissipation. The top of the battery module 30 is thermally connected to another liquid cooling plate 10 through an elastic thermally conductive part 120. The elastic thermally conductive part 120 can not only effectively transfer the heat of the battery module 30 to the liquid cooling plate 10 to cool the top of the battery module 30, but also play a buffering role during vibration, reducing the stress on the terminals of the battery cell 31.

[0076] The type of elastic thermally conductive part 120 can be selected as needed. For example, the elastic thermally conductive part 120 may include a thermally conductive silicone pad, a polyimide elastic thermally conductive part 120, or a thermally conductive adhesive. Exemplarily, in an embodiment of this application, the elastic thermally conductive part 120 includes a thermally conductive gel. This thermally conductive gel has a high thermal conductivity, effectively transferring heat from the top of the battery module 30 to the liquid cooling plate 10, thereby ensuring that the battery pack 100 remains within a safe operating temperature range during operation. The thermally conductive gel has good fluidity, flowing into and filling gaps between tiny gaps or irregular surfaces under pressure, forming a tight contact. This not only enhances the heat conduction path but also improves the reliability of the connection between the liquid cooling plate 10 and the top of the battery module 30. After curing, the thermally conductive gel retains a certain degree of elasticity and flexibility, which can absorb vibration and impact to a certain extent, reducing the stress transmitted to the terminals of the battery cell 31. In addition, thermally conductive gel can effectively compensate for dimensional changes caused by differences in the coefficient of thermal expansion and can continuously provide effective heat conduction during long-term operation, thus helping to improve the long-term reliability and durability of the entire system.

[0077] In some embodiments, the thickness of the elastic thermally conductive portion 120 is H1, wherein 3mm ≤ H1 ≤ 5mm. Thus, the thickness of the elastic thermally conductive portion 120 is within the range of 3mm to 5mm, enabling it to effectively transfer the heat generated by the battery module 30. The thickness of the elastic thermally conductive portion 120 within the range of 3mm to 5mm helps control thermal resistance and prevents heat accumulation during heat conduction. This helps maintain a stable operating temperature of the battery module 30 and prevents performance degradation or damage caused by overheating. The thickness of the elastic thermally conductive portion 120 within the range of 3mm to 5mm provides sufficient structural strength to resist vibrations and shocks from the external environment, which helps protect the battery module 30 from damage and ensures the reliability and durability of the battery pack 100.

[0078] Furthermore, as the thickness of the elastic thermally conductive part 120 increases, the heat conduction path within the thermally conductive material also lengthens. When the thickness of the elastic thermally conductive part 120 exceeds 5mm, the efficiency of heat transfer decreases, preventing the heat generated by the battery module 30 from being quickly transferred to the liquid cooling plate 10, thus affecting the heat dissipation performance of the battery pack 100. A thickness greater than 5mm also increases the thermal resistance of the elastic thermally conductive part 120, making it easier for heat to accumulate during transfer. This can lead to an increase in the operating temperature of the battery module 30, resulting in performance degradation, shortened lifespan, and even safety hazards. While increasing the thickness of the thermally conductive part may improve structural strength to some extent, a thickness greater than 5mm can cause uneven stress distribution within the elastic thermally conductive part 120, reducing structural strength and increasing production costs. When the thickness of the elastic thermally conductive part 120 is less than 5mm, it may be unable to withstand significant pressure or impact, making the battery terminals prone to deformation or damage. The elastic thermal conductive part 120 is usually made of polymer materials, which are prone to aging under long-term use or high-temperature environment. Thinner thermal conductive layers may be more susceptible to the effects of aging, resulting in a decrease in their thermal conductivity and structural strength.

[0079] It should be noted that the thickness of the elastic thermally conductive part 120 can be 3mm, 3.5mm, 3.9mm, 4mm, 4.3mm, 4.5mm, 4.8mm, or 5mm, etc. For example, this application does not limit it.

[0080] Referring to Figures 13 and 14, in some embodiments, one of the two adjacent liquid cooling plates 10 has a first side surface 132 facing the top of the corresponding battery module 30. The first side surface 132 has a first heat exchange zone. Along the thickness direction of the liquid cooling plate 10, the projection of the battery module 30 onto the other of the two adjacent liquid cooling plates 10 is within the first heat exchange zone. At least a portion of the elastic heat-conducting part 120 covers the first heat exchange zone. Thus, since the battery module 30 is projected within the first heat exchange zone, and the elastic heat-conducting part 120 at least partially covers this first heat exchange zone, the elastic heat-conducting part 120 acts as a bridge for heat conduction, more effectively transferring the heat generated by the battery module 30 to the liquid cooling plate 10, where it is dissipated by the coolant. This design optimizes the heat flow path and improves the heat dissipation efficiency of the battery module 30. The elastic heat-conducting part 120 not only has a heat conduction function but also absorbs and buffers the impact force on the battery module 30 to a certain extent, improving the shock resistance of the entire battery pack 100.

[0081] It should be noted that the shape and size of the elastic heat-conducting part 120 can be set as needed, and this application does not limit it.

[0082] In some embodiments, a first groove is provided on the side of one of the two adjacent liquid cooling plates 10 facing the top of the battery module 30. The first groove is located in the first heat exchange zone, and the elastic heat-conducting part 120 is located in the first groove. This ensures that the elastic heat-conducting part 120 can transfer heat more directly to the liquid cooling plate 10, improving heat dissipation efficiency. The design of the first groove can prevent the elastic heat-conducting part 120 from falling off or loosening during long-term use. This helps to maintain a good heat exchange effect between the battery module 30 and the liquid cooling plate 10, which can reduce the operating temperature of the battery module 30 and improve the energy conversion efficiency of the battery pack 100.

[0083] Referring to Figures 14 to 16, in some embodiments, the battery pack 100 further includes multiple first heat-conducting elements 130. The bottom of each battery module 30 is thermally connected to the corresponding liquid cooling plate 10 through the first heat-conducting elements 130. Thus, the first heat-conducting elements 130 act as bridges for heat conduction, rapidly transferring heat generated at the bottom of the battery module 30 to the liquid cooling plate 10. This design significantly shortens the heat transfer path, thereby improving heat dissipation efficiency. Because the first heat-conducting elements 130 can effectively transfer heat, the thermal stress caused by temperature differences between the battery module 30 and the liquid cooling plate 10 can be significantly reduced. This helps extend the service life of the battery pack 100 and reduce failures and damage caused by thermal stress.

[0084] It should be noted that the type of the first thermally conductive element 130 can be selected as needed. For example, the first thermally conductive element 130 may include at least one of thermally conductive structural adhesive or thermally conductive filler. Of course, in other embodiments, the first thermally conductive element 130 may include thermally conductive structural adhesive and thermally conductive gel, which are stacked sequentially. Exemplarily, this application does not limit the type of the first thermally conductive element 130.

[0085] For example, in an embodiment of this application, the first thermally conductive component 130 may include a thermally conductive structural adhesive. This adhesive possesses excellent thermal conductivity, enabling rapid heat transfer from high-temperature areas to low-temperature areas. In the battery pack 100, the thermally conductive structural adhesive serves as a heat transfer medium between the battery cell 31 and the heat dissipation component, effectively transferring the heat generated by the battery module 30 to the liquid cooling plate 10, achieving rapid heat transfer and dissipation. This efficient heat dissipation method helps reduce the operating temperature of the battery pack 100, improving its energy conversion efficiency and stability. The thermally conductive structural adhesive not only has thermal conductivity but also good adhesive properties, bonding and fixing the battery module 30 to the liquid cooling plate 10. This structure not only helps resist external impacts and vibrations, improving the impact resistance and durability of the battery pack 100, but also ensures the stability and reliability of the battery pack 100 during long-term use. Thermally conductive structural adhesive can be directly applied between the bottom of the battery module 30 and the liquid cooling plate 10 to form a thin thermally conductive layer. This design not only reduces assembly steps and costs in the production process, but also helps to improve production efficiency.

[0086] In some embodiments, the thickness of the first thermal conductive element 130 is H2, wherein 3mm ≤ H2 ≤ 5mm. Thus, the thickness of the first thermal conductive element 130 is within the range of 3mm to 5mm, enabling it to effectively transfer the heat generated by the battery module 30. The thickness of the first thermal conductive element 130 within the range of 3mm to 5mm helps control thermal resistance and prevents heat accumulation during heat conduction. This helps maintain a stable operating temperature of the battery module 30 and prevents performance degradation or damage caused by overheating. The thickness of the first thermal conductive element 130 within the range of 3mm to 5mm provides sufficient structural strength to resist vibrations and shocks from the external environment, which helps protect the battery module 30 from damage and ensures the reliability and durability of the battery pack 100.

[0087] Furthermore, as the thickness of the first thermal conductive element 130 increases, the heat conduction path within the thermal conductive material also lengthens. When the thickness of the first thermal conductive element 130 exceeds 5mm, the efficiency of heat transfer decreases, preventing the heat generated by the battery module 30 from being quickly transferred to the liquid cooling plate 10, thus affecting the heat dissipation performance of the battery pack 100. A thickness greater than 5mm also increases the thermal resistance of the first thermal conductive element 130, making it easier for heat to accumulate during transfer. This can lead to an increase in the operating temperature of the battery module 30, resulting in performance degradation, shortened lifespan, and even safety hazards. While increasing the thickness of the thermal conductive element may improve structural strength to some extent, a thickness greater than 5mm may increase production costs. When the thickness of the first thermal conductive element 130 is less than 3mm, it may be unable to withstand significant pressure or impact, making the battery module 30 prone to deformation or damage. The first heat-conducting component 130 is usually made of polymer materials, which are prone to aging during long-term use or in high-temperature environments. Thinner heat-conducting layers may be more susceptible to aging, leading to a decrease in their thermal conductivity and structural strength.

[0088] It should be noted that the thickness of the first heat-conducting element 130 can be 3mm, 3.5mm, 3.9mm, 4mm, 4.3mm, 4.5mm, 4.8mm, or 5mm, etc. For example, this application does not limit it.

[0089] Referring to Figures 14 and 16, in some embodiments, one of two adjacent liquid cooling plates 10 has a second side surface 133 facing the bottom of the battery module 30. The second side surface 133 has a second heat exchange zone. Along the thickness direction of the liquid cooling plate 10, the projection of the battery module 30 onto one of the two adjacent liquid cooling plates 10 is within the second heat exchange zone. At least a portion of the first heat-conducting element 130 covers the second heat exchange zone. Thus, since the battery module 30 is projected within the second heat exchange zone, and the first heat-conducting element 130 is ensured to at least partially cover the second heat exchange zone, the first heat-conducting element 130 acts as a bridge for heat conduction, enabling it to more effectively transfer the heat generated by the battery module 30 to the liquid cooling plate 10 and dissipate it through the coolant. This design optimizes the heat flow path and improves the heat dissipation efficiency of the battery module 30.

[0090] It should be noted that the shape and size of the first heat-conducting element 130 can be set as needed, and this application does not limit it.

[0091] In some embodiments, a second groove is provided on the side of one of the two adjacent liquid cooling plates 10 facing the bottom of the battery module 30. The second groove is located in the second heat exchange zone, and the first heat-conducting element 130 is located within the second groove. This ensures that the first heat-conducting element 130 can transfer heat more directly to the liquid cooling plate 10, improving heat dissipation efficiency. The design of the second groove can prevent the first heat-conducting element 130 from falling off or loosening during long-term use. This helps maintain a good heat exchange effect between the battery module 30 and the liquid cooling plate 10, which can reduce the operating temperature of the battery module 30 and improve the energy conversion efficiency of the battery pack 100.

[0092] Referring to Figures 17 to 19, the battery pack 100 also includes multiple heating elements 140, which are correspondingly arranged and connected to multiple liquid cooling plates 10, and configured to heat the battery module 30. This design allows the battery module 30 to be uniformly preheated by the heating elements 140 in low-temperature environments, enabling it to reach the required operating temperature and thus improving charging and discharging efficiency. The coordinated operation of the liquid cooling plates 10 and the heating elements 140 improves the thermal management efficiency of the battery pack 100. When the battery module 30 is at a high temperature, heat exchange occurs between the battery module 30 and the liquid cooling plates 10 to lower its temperature; when the battery module 30 is at a low temperature, the heating elements 140 heat it. This allows the battery pack 100 to adapt to various operating environments and temperature conditions. Whether in high or low temperature environments, the optimal operating state of the battery module 30 can be maintained through the adjustment of the liquid cooling plates 10 and the heating elements 140.

[0093] It should be noted that there are various ways in which the heating element 140 heats the battery module 30. For example, in some embodiments, the heating element 140 directly heats the battery module 30. In other embodiments, the heat provided by the heating element 140 is transferred to the coolant through the liquid cooling plate 10, and then transferred to the battery module 30 by the coolant, thereby heating the battery module 30. In other embodiments, while the heating element 140 directly heats the battery module 30, the heat radiated by the heating element 140 is transferred to the coolant, and then transferred to the battery module 30 by the coolant. Exemplarily, this application does not limit the way the heating element 140 heats the battery module 30.

[0094] Referring to Figures 17 to 19, in some embodiments, the liquid cooling plate 10 is provided with a third groove 16, and the heating element 140 is embedded in the third groove 16. This design of the third groove 16 allows the heating element 140 to be tightly embedded within the liquid cooling plate 10. This integration reduces additional space requirements, making the overall structure of the battery pack 100 more compact. The compact design helps maximize the energy density of the battery pack 100 while maintaining efficient thermal management capabilities. The increased contact area between the heating element 140 and the liquid cooling plate 10 due to the embedded third groove 16 helps improve heat exchange efficiency. A larger contact area means that heat can be transferred more quickly from the heating element 140 to the liquid cooling plate 10, where it can be dissipated or preheated by the coolant. The embedded structure of the third groove 16 and the heating element 140 increases the connection strength between them, making the entire thermal management system more robust. This design helps prevent the heating element 140 from loosening or falling off under vibration or impact conditions, improving the reliability and durability of the battery pack 100. In addition, the design of the third groove 16 simplifies the installation process of the heating part 140, making installation more convenient and quick.

[0095] It should be noted that the shape of the third groove 16 can be selected as needed. For example, in some embodiments, the cross-section of the third groove 16 can be square, rectangular, or elliptical. Exemplarily, this application does not limit this.

[0096] Exemplary, the connection method between the heating element 140 and the liquid cooling plate 10 can be selected as needed. For example, in some embodiments, the heating element 140 and the liquid cooling plate 10 can also be threaded together by a screw connector. In other embodiments, the heating element 140 and the liquid cooling plate 10 can also be fixed by welding. Exemplary, this application does not limit this.

[0097] Referring to Figures 17 and 18, in some embodiments, the surface of the heating element 140 facing away from the third groove 16 is flush with or lower than the periphery of the third groove 16. This design, where the protruding heating element 140 is more susceptible to impact or wear, effectively reduces such impact and wear, thereby improving the service life of the heating element 140. The flush or lower design of the heating element 140 with the periphery of the third groove 16 makes the overall appearance of the liquid cooling plate 10 smoother and more aesthetically pleasing. When the surface of the heating element 140 is flush with or lower than the periphery of the third groove 16, the external contours of the liquid cooling plate 10 and the heating element 140 become more compact and flat. This design reduces unnecessary space waste, allowing for the installation of as many battery modules 30 as possible.

[0098] Referring to Figure 17, in some embodiments, the heating element 140 includes a plurality of heating plates 141 spaced apart along the extension direction of the liquid cooling plate 10. This spaced arrangement of the liquid cooling plates 10 helps to disperse heat, reduce the risk of single-point overheating, and improve temperature consistency among the battery modules 30, thereby enhancing the performance and lifespan of the battery pack 100. The spacing between the heating plates 141 also facilitates maintenance, as damaged heating plates 141 can be more easily accessed and replaced.

[0099] It should be noted that by optimizing the arrangement and number of heating plates 141, costs can be reduced while maintaining efficient thermal management.

[0100] Referring to Figures 18 and 19, in some embodiments, the battery module 30 includes multiple battery cells 31, each with a heating plate 141 positioned at both its bottom and top. This ensures uniform heating of the battery cell 31 from bottom to top, reducing the internal temperature gradient and improving heating efficiency. Because each battery cell 31 is heated uniformly, the temperature difference between cells 31 within the battery module 30 is reduced, improving the consistency of the battery module 30. This increased consistency helps extend the battery module 30's lifespan and reduces performance degradation caused by temperature differences. The presence of heating plates 141 at both the bottom and top of the battery cells 31 allows the battery module 30 to reach its optimal operating temperature more quickly in low-temperature environments, optimizing thermal management and improving the stability and reliability of the battery module 30.

[0101] Referring to Figure 18, in some embodiments, the plurality of heating plates 141 includes a first heating plate 1411 located on top of the battery cell 31. The first heating plate 1411 is positioned at the center of the top of the battery cell 31. This centrally located first heating plate 1411 ensures a relatively even heat diffusion path, reducing localized overheating or undercooling and improving the overall temperature uniformity of the battery cell 31. Compared to other positions, the distance from the first heating plate 1411 located at the center of the top of the battery cell 31 to each part of the battery cell 31 is relatively even, resulting in less heat loss during heat propagation. This allows the battery cell 31 to reach a suitable operating temperature more quickly, reducing battery preheating time and improving the usability of the battery module 30 in low-temperature environments.

[0102] It should be noted that the number of first heating plates 1411 on top of the battery cell 31 can be set as needed. For example, the number of first heating plates 1411 can be one, two, three, or more. When there is only one first heating plate 1411, it can be located in the middle of the top of the battery cell 31. When there are multiple first heating plates 1411, they can be arranged at intervals along the periphery of the top of the battery cell 31 and positioned near the middle of the top of the battery cell 31.

[0103] Referring to Figure 18, in some embodiments, the plurality of heating plates 141 includes a second heating plate 1412 located at the bottom of the battery cell 31. The second heating plate 1412 is positioned in the middle of the bottom of the battery cell 31. Thus, the second heating plate 1412, located in the center, allows for a relatively even heat diffusion path, reducing local overheating or undercooling and improving the temperature uniformity of the entire battery cell 31. Compared to other positions, the distance from the second heating plate 1412, located in the middle of the bottom of the battery cell 31, to each part of the battery cell 31 is relatively even, resulting in relatively small heat transfer path losses. This allows the battery cell 31 to reach a suitable operating temperature more quickly, reducing battery preheating time and improving the usability of the battery module 30 in low-temperature environments.

[0104] It should be noted that the number of second heating plates 1412 located at the bottom of the battery cell 31 can be set as needed. For example, the number of second heating plates 1412 can be one, two, three, or more. When there is only one second heating plate 1412, it can be located in the middle of the bottom of the battery cell 31. When there are multiple second heating plates 1412, they can be arranged at intervals along the periphery of the bottom of the battery cell 31 and positioned near the middle of the bottom of the battery cell 31.

[0105] In some embodiments, the plurality of liquid cooling plates 10 include a second liquid cooling plate 12. The second liquid cooling plate 12 has two second sides disposed opposite to each other along its thickness direction. A battery module 30 is disposed on each of the two second sides, and a heating element 140 is disposed between each second side and the battery module 30. This design allows the second liquid cooling plate 12 to exchange heat with the two battery modules 30, improving heat exchange efficiency and enabling the two battery modules 30 to reach the required temperature range more quickly. The heating element 140 disposed between the second side and the battery module 30 can provide additional heat to the battery module 30 when needed. Simultaneously, the heating element 140 can also serve as a heat transfer medium, facilitating more efficient heat exchange between the battery module 30 and the liquid cooling plate 10. Since both second sides are equipped with battery modules 30 and heating elements 140, it can be ensured that the two battery modules 30 are subjected to the same amount of heat during heating or cooling, thereby reducing temperature differences and enhancing the consistency between the battery modules 30. Heating elements 140 are provided on both the second side and between the battery module 30, which can make the temperature of the battery module 30 uniformly distributed and achieve effective thermal management, thereby extending the service life of the battery module 30.

[0106] In some embodiments, the heating element 140 includes a positive temperature coefficient (PTC) thermistor or a constant resistance heating element. When the heating element 140 includes a PTC thermistor, the PTC thermistor has excellent heating efficiency, enabling it to rapidly convert electrical energy into heat energy, thereby quickly heating the battery module 30. The PTC thermistor has an automatic temperature control characteristic, meaning its resistance increases with temperature, thus limiting current flow and reducing heating power. This characteristic allows the PTC thermistor to achieve precise temperature control of the battery module 30, avoiding overheating or underheating and ensuring the battery module 30 operates within a safe operating range. By precisely controlling the temperature of the battery module 30, the PTC thermistor helps improve battery performance and reliability. At a suitable operating temperature, the battery's electrochemical reaction rate and ion migration rate are enhanced, thereby improving the battery's discharge performance and cycle life. The PTC thermistor also has overheat protection; when the battery module 30 temperature is too high, its resistance increases sharply, limiting current flow and preventing damage to the battery module 30 due to overheating. This overheat protection feature helps enhance the safety of the battery system and reduces the risk of fire or explosion caused by battery failure. Positive temperature coefficient (PTC) thermistors exhibit good stability and reliability during long-term use. Their resistance variation range is relatively limited, and the change is small over long-term use. This means that PTC thermistors can maintain stable heating performance for extended periods, providing continuous and reliable heating support for the battery module 30.

[0107] When the heating element 140 includes a constant resistance heating element, its resistance remains essentially constant within a certain temperature range, thus providing stable heating power. This stable heating performance helps ensure that the battery module 30 receives uniform and continuous heat during the heating process, thereby avoiding adverse effects of temperature fluctuations on battery performance. The heating power of the constant resistance heating element can be precisely controlled by adjusting the current or voltage. This means that in practical applications, the heating power can be flexibly adjusted according to the specific needs and heating conditions of the battery module 30 to achieve the best heating effect. Furthermore, due to the stable heating performance of the constant resistance heating element, its control system is relatively simple, reducing system complexity and maintenance costs. The constant resistance heating element does not generate open flames or high-temperature hotspots during heating, thus ensuring relatively high safety. If the temperature rises abnormally during the heating process of the battery module 30, the heating element can be shut off in time through the control system, thereby preventing the battery module 30 from being damaged by overheating or causing safety hazards such as fires. Compared to some complex heating systems, the cost of the constant resistance heating element is relatively low. It does not require complex control systems and additional sensors, thus reducing the overall cost of the battery thermal management system. This has significant economic implications for the production and application of battery module 30.

[0108] It should be noted that the heating element 140 of the battery module 30 can be selected as needed. For example, in some embodiments, the battery module 30 can be heated by a positive temperature coefficient thermistor. In other embodiments, the battery module 30 can be heated by a constant resistance heating element. Of course, in other embodiments, a combination of a positive temperature coefficient thermistor and a constant resistance heating element can be used to heat the battery module 30. Exemplarily, this application does not limit this.

[0109] In some embodiments, the battery pack 100 further includes a plurality of second heat-conducting elements 180. The liquid cooling plate 10 and the heating element 140 are both thermally connected to the battery module 30 via the second heat-conducting elements 180. The second heat-conducting elements 180 can quickly transfer the heat generated by the battery module 30 to the liquid cooling plate 10, accelerating heat dissipation and rapidly reducing the temperature of the battery module 30, preventing safety hazards caused by overheating. When the temperature of the battery module 30 is too low, the heating element 140 can evenly transfer heat to the battery module 30 through the second heat-conducting elements 180, achieving rapid and uniform preheating. This helps ensure that the battery module 30 maintains good performance even in low-temperature environments. Efficient heat transfer ensures that the battery module 30 operates within a suitable operating temperature range, avoiding damage to battery performance caused by overheating or overcooling.

[0110] It should be noted that the type of the second thermal conductive element 180 can be selected as needed. For example, the second thermal conductive element 180 may include thermally conductive adhesive, thermally conductive silicone sheet, thermally conductive sealant, or thermally conductive structural adhesive. Exemplarily, this application does not limit this.

[0111] Secondly, embodiments of this application also propose an electrical device, including, for example, a battery pack 100. The specific structure of the battery pack 100 is described in the embodiments. Since this electrical device adopts all the technical solutions of all embodiments, it has at least all the beneficial effects brought about by the technical solutions of the embodiments, which will not be described in detail here.

[0112] It should be noted that electrical equipment may include vehicles, energy storage power supplies, consumer electronics, medical devices, smart cities, etc. For example, the selection of electrical equipment can be made according to needs, and this application does not impose any limitations on it.

Claims

1. A battery pack (100), comprising: Multiple liquid cooling plates (10) are arranged at intervals along the direction of gravity; Multiple side frames (20) are provided between two adjacent liquid cooling plates (10), and each side frame (20) is connected to two liquid cooling plates (10) at both ends. Multiple side frames (20) and multiple liquid cooling plates (10) are arranged together to form multiple battery compartments (51). Multiple battery modules (30) are installed in multiple battery compartments (51), and both ends of the battery modules (30) that are opposite to each other along the direction of gravity are thermally connected to the corresponding liquid cooling plate (10).

2. The battery pack (100) according to claim 1, wherein, The plurality of liquid cooling plates (10) include a first liquid cooling plate (11) which is located at the lowest point along the direction of gravity; The plurality of side frames (20) include a first side frame (21), which is mounted on the side of the first liquid cooling plate (11) away from the direction of gravity; The battery pack (100) further includes an end plate (40) and a first electrical component (61). The end plate (40) is located on the side of the first side frame (21) away from the battery compartment (51). The end plate (40), the side frame (20) and the first liquid cooling plate (11) together form a first electrical compartment (52). The first electrical component (61) is installed in the first electrical compartment (52).

3. The battery pack (100) according to claim 2, wherein, The plurality of liquid cooling plates (10) include a second liquid cooling plate (12) connected to the first side frame (21); The plurality of side frames (20) further include at least two second side frames (22), the plurality of second side frames (22) are connected to the side of the second liquid cooling plate (12) away from the direction of gravity, the plurality of second side frames (22) are spaced apart, and the battery module (30) is installed in each second side frame (22).

4. The battery pack (100) according to claim 3, wherein, The plurality of liquid cooling plates (10) further include a third liquid cooling plate (13), the third liquid cooling plate (13) includes a plurality of liquid cooling plates (10)(131), the plurality of liquid cooling plates (10)(131) are arranged in a one-to-one correspondence with a plurality of second side frames (22), and each liquid cooling plate (10)(131) is connected to the side of the corresponding second side frame (22) away from the second liquid cooling plate (12).

5. The battery pack (100) according to claim 4 further includes a cover portion (70), the cover portion (70) being disposed on the side of the first side frame (21) away from the direction of gravity, and the periphery of the cover portion (70) being connected to the periphery of the first side frame (21). The third liquid cooling plate (13), the second side frame (22) and the second liquid cooling plate (12) are all located inside the cover part (70).

6. The battery pack (100) according to claim 5, wherein, The enclosure (70) and the second liquid cooling plate (12) together form a second electrical compartment (53); The battery pack (100) also includes a second electrical component (62), which is installed in the second electrical compartment (53) and electrically connected to the battery module (30) located in the second side frame (22).

7. The battery pack (100) according to claim 5, wherein, The cover (70) includes: Multiple covers (71) are provided, and the multiple covers (71) are provided in a one-to-one correspondence with the multiple second side frames (22). Each cover (71) is configured to cover the corresponding second side frame (22) and the liquid distribution cooling plate (10)(131). The connecting body (72) is arranged around the periphery of the plurality of covers (71) and is connected to one end of the plurality of covers (71) adjacent to the second liquid cooling plate (12). The periphery of the connecting body (72) is connected to the periphery of the first side frame (21).

8. The battery pack (100) according to any one of claims 1 to 7, wherein, The side frame (20) includes: Two side beams (23) are arranged opposite each other and spaced apart along a first direction. Each side beam (23) extends along a second direction. The first direction, the second direction, and the gravity direction intersect each other. Multiple longitudinal beams (24) are spaced apart along the second direction, and each of the longitudinal beams (24) extends along the first direction; and Multiple reinforcement members (25) are provided at the ends of multiple longitudinal beams (24). Each reinforcement member (25) includes a connecting seat (251) and a plug-in part (252) protruding from the connecting seat (251). The connecting seat (251) is fixedly connected to the side beam (23). The plug-in part (252) is plugged into the end of the corresponding longitudinal beam (24). The plug-in part (252) has two first sidewalls (2521) arranged opposite to each other along the second direction. The two first sidewalls (2521) are fixedly connected to the corresponding longitudinal beam (24) through multiple connectors (90).

9. The battery pack (100) according to claim 8, wherein, The longitudinal beam (24) includes: The connecting part (241) abuts against the liquid cooling plate (10), and the connecting part (241) has two first sides that are disposed opposite to each other along the second direction; Two protrusions (242) are provided on the two first sides, and each of the protrusions (242) is welded to the liquid cooling plate (10).

10. The battery pack (100) according to any one of claims 1 to 7 further includes a reinforcing member (110) connected to at least two of the plurality of liquid cooling plates (10), the reinforcing member (110) being configured to support the side frame (20) between the at least two liquid cooling plates (10).

11. The battery pack (100) according to claim 10, wherein, The side frame (20) between the at least two liquid cooling plates (10) includes a second side frame (22), the second side frame (22) is provided with a through hole (221), the through hole (221) is provided through the second side frame (22) along the direction of gravity; The reinforcing member (110) is provided corresponding to the through hole (221), and part of the reinforcing member (110) is inserted into the through hole (221).

12. The battery pack (100) according to claim 11, wherein, At least two of the plurality of liquid cooling plates (10) connected to the reinforcing member (110) include a second liquid cooling plate (12) and a third liquid cooling plate (13), one of the third liquid cooling plate (13) and the second liquid cooling plate (12) is provided with a mounting hole (14), and the mounting hole (14) is provided corresponding to the through hole (221); The third liquid cooling plate (13) and the second liquid cooling plate (12) are provided with a first threaded hole (15), and the first threaded hole (15) is provided in correspondence with the through hole (221); The reinforcing member (110) includes a first threaded member (1101), the threaded end of which is adapted to pass through the mounting hole (14), and the through hole (221) is threadedly connected to the first threaded hole (15).

13. The battery pack (100) according to any one of claims 10 to 12, wherein, Multiple reinforcing members (110) are provided, and the multiple reinforcing members (110) are arranged at intervals along the circumference of the second side frame (22).

14. The battery pack (100) according to claim 13, wherein, The second side frame (22) includes two expansion beams (222) arranged opposite to each other; Multiple of the reinforcing members (110) are disposed on the two expansion beams (222).

15. The battery pack (100) according to any one of claims 11 to 14, wherein, The side frame (20) between the at least two liquid cooling plates (10) further includes a first side frame (21) adjacent to the second side frame (22), and the reinforcing member (110) is adapted to be connected to the first side frame (21).

16. The battery pack (100) according to any one of claims 1 to 15, wherein, It also includes a filler that fills the gap between the side frame (20) and the battery module (30).

17. The battery pack (100) according to any one of claims 1 to 16, wherein, Along the thickness direction of the liquid cooling plate (10), the battery module (30) has a top and a bottom, and the bottom of the battery module (30) is thermally connected to one of the two adjacent liquid cooling plates (10); The battery pack (100) also includes a plurality of elastic heat-conducting parts (120), and the top of each battery module (30) is thermally connected to another of the two adjacent liquid cooling plates (10) through the elastic heat-conducting parts (120).

18. The battery pack (100) according to claim 17, wherein, The elastic thermally conductive part (120) includes a thermally conductive gel.

19. The battery pack (100) according to claim 17 or 18, wherein, The thickness of the elastic heat-conducting part (120) is H1, wherein 3mm≤H1≤5mm.

20. The battery pack (100) according to any one of claims 17 to 19, wherein, The other of the two adjacent liquid cooling plates (10) has a first side surface (132) disposed facing the top of the corresponding battery module (30), and the first side surface (132) has a first heat exchange area; Along the thickness direction of the liquid cooling plate (10), the projection of the battery module (30) onto the other of the two adjacent liquid cooling plates (10) is located within the first heat exchange zone; The elastic heat-conducting part (120) at least partially covers the first heat exchange zone.

21. The battery pack (100) according to claim 20, wherein, A first groove is provided on the side of one of the two adjacent liquid cooling plates (10) facing the top of the battery module (30), and the first groove is located in the first heat exchange zone; The elastic heat-conducting part (120) is located in the first groove.

22. The battery pack (100) according to any one of claims 17 to 21 further includes a plurality of first heat-conducting elements (130), wherein the bottom of each battery module (30) is thermally connected to the corresponding liquid cooling plate (10) through the first heat-conducting elements (130).

23. The battery pack (100) according to claim 22, wherein, The first thermally conductive component (130) includes at least one of thermally conductive structural adhesive or thermally conductive filler.

24. The battery pack (100) according to claim 22, wherein, The thickness of the first heat-conducting component (130) is H2, wherein 3mm≤H2≤5mm.

25. The battery pack (100) according to any one of claims 22 to 24, wherein, One of the two adjacent liquid cooling plates (10) has a second side surface (133) facing the bottom of the battery module (30), and the second side surface (133) has a second heat exchange area; Along the thickness direction of the liquid cooling plate (10), the projection of the battery module (30) onto one of the two adjacent liquid cooling plates (10) is located within the second heat exchange zone; The first heat-conducting element (130) covers at least a portion of the second heat exchange zone.

26. The battery pack (100) according to claim 25, wherein, A second groove is provided on one side of one of the two adjacent liquid cooling plates (10) facing the bottom of the battery module (30), and the second groove is located in the second heat exchange zone; The first heat-conducting element (130) is located in the second groove.

27. The battery pack (100) according to any one of claims 1 to 26 further includes a plurality of heating parts (140), the plurality of heating parts (140) being correspondingly disposed and connected to the plurality of liquid cooling plates (10), and configured to heat the battery module (30).

28. The battery pack (100) according to claim 27, wherein, The liquid cooling plate (10) is provided with a third groove (16); The heating element (140) is embedded in the third groove (16).

29. The battery pack (100) according to claim 28, wherein, The surface of the heating part (140) facing away from the third groove (16) is flush with or lower than the periphery of the third groove (16).

30. The battery pack (100) according to any one of claims 27 to 29, wherein, The heating section (140) includes a plurality of heating plates (141), which are spaced apart along the extension direction of the liquid cooling plate (10).

31. The battery pack (100) according to claim 30, wherein, The battery module (30) includes multiple battery cells (31), and each battery cell (31) has a heating plate (141) corresponding to its bottom and top.

32. The battery pack (100) according to claim 31, wherein, The plurality of heating plates (141) include a first heating plate (1411) located on top of the battery cell (31), the first heating plate (1411) being located at the middle position on top of the battery cell (31).

33. The battery pack (100) according to claim 32, wherein, The plurality of heating plates (141) include a second heating plate (1412) located at the bottom of the battery cell (31), the second heating plate (1412) being located at the middle position of the bottom of the battery cell (31).

34. The battery pack (100) according to any one of claims 27 to 33, wherein, The plurality of liquid cooling plates (10) include a second liquid cooling plate (12), the second liquid cooling plate (12) having two second sides disposed opposite to each other along its thickness direction, the battery module (30) being disposed on both second sides, and the heating part (140) being disposed between the second side and the battery module (30).

35. The battery pack (100) according to any one of claims 27 to 34, wherein, The heating element (140) includes a positive temperature coefficient thermistor or a constant resistance heating element.

36. The battery pack (100) according to any one of claims 27 to 35 further includes a plurality of second heat-conducting elements (180), wherein the liquid cooling plate (10) and the heating part (140) are thermally connected to the battery module (30) through the second heat-conducting elements (180).

37. An electrical appliance comprising a battery pack (100) as described in any one of claims 1 to 36.

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