Battery pack and electric equipment

Abstract

According to the battery pack and the electric equipment, the battery pack comprises the plurality of liquid cooling plates, the plurality of battery modules and the plurality of elastic heat conduction parts, the plurality of liquid cooling plates are sequentially arranged at intervals, and the battery modules are mounted between every two adjacent liquid cooling plates, so that the temperature difference between the battery modules can be reduced, and the temperature difference between the battery modules can be reduced; and the temperature uniformity of the whole battery pack is improved. The battery module is provided with the top and the bottom in the thickness direction of the liquid cooling plates, and the bottom is in heat conduction connection with one of the two adjacent liquid cooling plates, so that heat generated by the battery module can be effectively transmitted to the liquid cooling plates for heat dissipation. The top of each battery module is in heat conduction connection with the other one of the two adjacent liquid cooling plates through the corresponding elastic heat conduction part, the elastic heat conduction parts can effectively transfer heat of the battery modules to the liquid cooling plates, cooling of the tops of the battery modules is achieved, the elastic heat conduction parts can also play a buffering role during vibration, and stress borne by the battery cell pole columns is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric equipment, concretely relates to battery pack and electric equipment. BACKGROUND

[0002] The battery pack usually includes a shell and a battery module arranged in the shell, in order to improve the energy density of the battery pack, double-layer battery modules are usually arranged in the shell, and the double-layer battery modules include an upper-layer battery module and a lower-layer battery module. In the related art, the bottom of the lower-layer battery module is in heat conduction connection with a lower-layer liquid cooling plate, and an upper-layer liquid cooling plate is in heat conduction connection with the bottom of the upper-layer battery module and the top of the lower-layer battery module through a heat conduction structure adhesive. However, when vibration occurs, force is transmitted to the top of the lower-layer battery module, which causes damage to the top of the lower-layer battery module. SUMMARY

[0003] Embodiments of the utility model provide a battery pack and electric equipment, which aims at solving the problem that in the related art, an upper-layer liquid cooling plate is in heat conduction connection with the bottom of an upper-layer battery module and the top of a lower-layer battery module through a heat conduction structure adhesive, however, when vibration occurs, force is transmitted to the top of the lower-layer battery module, which causes damage to the top of the lower-layer battery module.

[0004] In a first aspect, embodiments of the utility model provide a battery pack.

[0005] In an embodiment, the battery pack includes:

[0006] a plurality of liquid cooling plates arranged at intervals;

[0007] a plurality of battery modules, each of which is arranged between two adjacent liquid cooling plates, and each of which has a top and a bottom along the thickness direction of the liquid cooling plate, and the bottom is in heat conduction connection with one of the two adjacent liquid cooling plates;

[0008] a plurality of elastic heat conduction parts, each of which is in heat conduction connection with the other of the two adjacent liquid cooling plates through the elastic heat conduction part;

[0009] wherein, the other of the two adjacent liquid cooling plates is provided with a first groove on the side facing the top of the battery module, and the elastic heat conduction part is located in the first groove.

[0010] In an embodiment, the elastic heat conduction part includes a heat conduction gel.

[0011] In an embodiment, the thickness of the elastic heat conduction part is H1, and 3mm≤H1≤5mm.

[0012] In an embodiment, another of the two adjacent liquid cooling plates has a first side surface arranged towards the top of the corresponding battery module, the first side surface having a first heat exchange region;

[0013] The projection of the battery module on the other of the two adjacent liquid cooling plates is in the first heat exchange region along the thickness direction of the liquid cooling plate;

[0014] At least part of the elastic heat-conducting part covers the first heat exchange region.

[0015] In an embodiment, the first recess is in the first heat exchange region.

[0016] In an embodiment, the bottom of each battery module is connected to the corresponding liquid cooling plate through a heat-conducting member.

[0017] In an embodiment, the heat-conducting member comprises at least one of a heat-conducting structural adhesive or a heat-conducting filler.

[0018] In an embodiment, the heat-conducting member has a thickness H2, where 3mm≤H2≤5mm.

[0019] In an embodiment, one of the two adjacent liquid cooling plates has a second side surface arranged towards the bottom of the battery module, the second side surface having a second heat exchange region;

[0020] The projection of the battery module on one of the two adjacent liquid cooling plates is in the second heat exchange region along the thickness direction of the liquid cooling plate;

[0021] At least part of the heat-conducting member covers the second heat exchange region.

[0022] In an embodiment, one of the two adjacent liquid cooling plates has a second recess arranged towards the bottom of the battery module, the second recess being in the second heat exchange region;

[0023] The heat-conducting member is in the second recess.

[0024] In an embodiment, a plurality of side frames are arranged between the two adjacent liquid cooling plates, each side frame has two ends connected to the two liquid cooling plates, and the plurality of side frames and the plurality of liquid cooling plates jointly define a plurality of battery compartments.

[0025] The plurality of battery modules are installed in the plurality of battery compartments.

[0026] In an embodiment, the side frame comprises a plurality of beam bodies, each beam body comprises:

[0027] a beam edge having two first side walls arranged away from each other along the extension direction of the liquid cooling plate;

[0028] Two protrusions are provided on the two first side walls, and each of the protrusions is welded and fixed with the liquid cooling plate.

[0029] In an embodiment, in the thickness direction of the liquid cooling plate, the size of the protrusion is H3, wherein 1.5mm≤H3≤2.5mm; and / or,

[0030] In the extension direction of the liquid cooling plate, the distance between the protrusion and the beam edge is L, wherein 2mm≤L≤4mm.

[0031] In a second aspect, the embodiments of the utility model provide a kind of electric equipment.

[0032] In an embodiment, the electric equipment includes the battery pack described above.

[0033] The beneficial effects of the embodiments of the utility model are as follows:

[0034] In the embodiments of the utility model, the liquid cooling plate can effectively absorb and take away a large amount of heat generated by the battery module in the working process through the cooling liquid flowing inside, so as to ensure that the battery module always remains in a suitable working temperature range and avoid the influence of overheating on the performance and service life of the battery. Since the liquid cooling plates are arranged in sequence and at intervals, the battery module between the two adjacent liquid cooling plates can be uniformly cooled, which helps to reduce the temperature difference between the battery modules and improve the temperature uniformity of the entire battery pack. The bottom of the battery module is in thermal conductive connection with an adjacent liquid cooling plate, which ensures that the heat generated by the battery module can be effectively transmitted to the liquid cooling plate for heat dissipation. The top of the battery module is in thermal conductive connection with another liquid cooling plate through the elastic heat conduction part, which not only effectively transmits the heat of the battery module to the liquid cooling plate to realize the cooling of the top of the battery module, but also plays a buffering role when vibrating to reduce the stress on the pole of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0036] Figure 1 is the structural schematic view of the battery pack provided by the embodiments of the utility model;

[0037] Figure 2 is Figure 1 is the cross-sectional schematic view of the battery pack shown in the figure;

[0038] Figure 3 is Figure 2 is a local enlarged view of A shown in the figure.

[0039] Figure 4 is a sectional view of the battery pack (part of the structure) provided by the embodiment of the utility model;

[0040] Figure 5 is Figure 4 is a local enlarged view of B shown in the figure.

[0041] Figure 6 is a structural schematic view of the side frame provided by the embodiment of the utility model.

[0042] Explanation of reference signs:

[0043] 100, battery pack; 10, liquid cooling plate; 20, battery module; 30, elastic heat conduction part; 40, heat conduction piece; 50, side frame; 51, beam body; 511, beam edge; 512, protruding part; 60, battery cabin. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, the orientation words such as 'up' and 'down' generally refer to the up and down of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings; and 'inner' and 'outer' refer to the contour of the device.

[0045] The battery pack usually comprises a shell and a battery module arranged in the shell, in order to improve the energy density of the battery pack, a double-layer battery module is usually arranged in the shell, and the double-layer battery module comprises an upper-layer battery module and a lower-layer battery module. In the related art, the bottom of the lower-layer battery module is in heat conduction connection with a lower-layer liquid cooling plate, and an upper-layer liquid cooling plate is in heat conduction connection with the bottom of the upper-layer battery module and the top of the lower-layer battery module through a heat conduction structural adhesive. However, when vibrating, the force is transmitted to the top electrical pole of the lower-layer battery module, so that the top electrical pole of the lower-layer battery module is damaged.

[0046] Therefore, the utility model provides a battery pack, Figures 1 to 6The battery pack provided by the utility model can play a buffering role when vibrating, and reduce the stress on the pole of the battery cell.

[0047] Referring to Figures 1 to 3 The battery pack 100 includes a plurality of liquid cooling plates 10, a plurality of battery modules 20, and a plurality of elastic heat-conducting parts 30. The plurality of liquid cooling plates 10 are arranged in sequence with intervals. Each of the battery modules 20 is installed between two adjacent liquid cooling plates 10. The battery module 20 has a top portion and a bottom portion along the thickness direction of the liquid cooling plate 10. The bottom portion is in thermal contact with one of the two adjacent liquid cooling plates 10. Each of the top portions of the battery modules 20 is in thermal contact with the other of the two adjacent liquid cooling plates 10 through the elastic heat-conducting part 30.

[0048] In the embodiment of the utility model, the liquid cooling plate 10 can effectively absorb and remove a large amount of heat generated by the battery module 20 during operation through the cooling liquid flowing inside, so as to ensure that the battery module 20 always remains within a suitable working temperature range and avoid the influence of overheating on the performance and service life of the battery. Since the liquid cooling plates 10 are arranged in sequence with intervals, the battery module 20 between the two adjacent liquid cooling plates 10 can be uniformly cooled. This design helps to reduce the temperature difference between the battery modules 20 and improve the temperature uniformity of the entire battery pack 100. The bottom portion of the battery module 20 is in thermal contact with one of the adjacent liquid cooling plates 10, which ensures that the heat generated by the battery module 20 can be effectively transferred to the liquid cooling plate 10 for heat dissipation. The top portion of the battery module 20 is in thermal contact with the other liquid cooling plate 10 through the elastic heat-conducting part 30. The elastic heat-conducting part 30 not only effectively transfers the heat of the battery module 20 to the liquid cooling plate 10 to achieve cooling of the top portion of the battery module 20, but also plays a buffering role when vibrating to reduce the stress on the pole of the battery cell.

[0049] The type of the elastic heat-conducting part 30 can be selected as needed, for example, the elastic heat-conducting part 30 can include a heat-conducting silica gel pad, a polyimide elastic heat-conducting part 30, or a heat-conducting adhesive, etc. Specifically, in the embodiment of the present application, the elastic heat-conducting part 30 includes a heat-conducting gel, so that the heat-conducting gel has a high thermal conductivity, which can effectively transfer heat from the top of the battery module 20 to the liquid cooling plate 10, thereby ensuring that the battery pack 100 remains within a safe operating temperature range when working. The heat-conducting gel has good fluidity and can flow into and fill the gaps between small gaps or irregular surfaces when pressure is applied, forming a tight contact, which 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 20. The heat-conducting gel still retains a certain elasticity and flexibility after solidification, which can absorb vibration and impact force to a certain extent and reduce the stress transmitted to the cell pole. In addition, the heat-conducting gel can well compensate for the size changes caused by the difference in thermal expansion coefficient and can continuously provide effective heat conduction in long-term operation, so it helps to improve the long-term reliability and durability of the entire system.

[0050] In an embodiment, the thickness of the elastic heat-conducting part 30 is H1, where 3mm≤H1≤5mm, so that the thickness of the elastic heat-conducting part 30 is within the range of 3mm to 5mm, which enables the elastic heat-conducting part 30 to effectively transfer the heat generated by the battery module 20. The thickness of the elastic heat-conducting part 30 within the range of 3mm to 5mm helps to control the thermal resistance and avoid heat accumulation during heat conduction, which helps to maintain the working temperature of the battery module 20 stable and prevent performance degradation or damage caused by overheating. The thickness of the elastic heat-conducting part 30 within the range of 3mm to 5mm can provide sufficient structural strength to resist vibration and impact from the external environment, which helps to protect the battery module 20 from damage and ensures the reliability and durability of the battery pack 100.

[0051] In addition, as the thickness of the elastic heat-conducting part 30 increases, the conduction path of heat in the heat-conducting material also increases, and when the thickness of the elastic heat-conducting part 30 is greater than 5 mm, the efficiency of heat transfer is reduced, so that the heat generated by the battery module 20 cannot be quickly transferred to the liquid cooling plate 10, thereby affecting the heat dissipation performance of the battery pack 100. When the thickness of the elastic heat-conducting part 30 is greater than 5 mm, the thermal resistance of the elastic heat-conducting part 30 increases, so that heat is more likely to accumulate during transmission, which can cause the working temperature of the battery module 20 to rise, thereby causing performance degradation, shortened service life, and even safety hazards. Although increasing the thickness of the heat-conducting part can improve the structural strength to some extent, when the thickness of the elastic heat-conducting part 30 is greater than 5 mm, the stress distribution inside the elastic heat-conducting part 30 can be uneven, thereby reducing the structural strength and increasing the production cost. When the thickness of the elastic heat-conducting part 30 is less than 3 mm, the elastic heat-conducting part 30 can not be able to withstand a large pressure or impact force, so that the battery pole can easily deform or be damaged. The elastic heat-conducting part 30 is usually made of high-molecular materials, which can easily age under long-term use or high-temperature environment, and the thinner heat-conducting layer can be more susceptible to aging, thereby reducing the heat-conducting performance and structural strength.

[0052] It should be noted that the thickness of the elastic heat-conducting part 30 can be 3 mm, 3.5 mm, 3.9 mm, 4 mm, 4.3 mm, 4.5 mm, 4.8 mm, or 5 mm, etc. Specifically, the present application does not limit this.

[0053] Referring to Figures 3 to 5 In an embodiment, the other of the two adjacent liquid cooling plates 10 has a first side surface arranged towards the top of the corresponding battery module 20, and the first side surface has a first heat exchange area, and the projection of the battery module 20 on the other of the two adjacent liquid cooling plates 10 is located in the first heat exchange area, and at least part of the elastic heat-conducting part 30 covers the first heat exchange area. In this way, since the battery module 20 is projected in the first heat exchange area, and the elastic heat-conducting part 30 is ensured to at least partially cover the first heat exchange area, the elastic heat-conducting part 30 can more effectively transfer the heat generated by the battery module 20 to the liquid cooling plate 10 as a bridge for heat conduction, and dissipate heat through the cooling liquid. This design optimizes the heat flow path and improves the heat dissipation efficiency of the battery module 20. The elastic heat-conducting part 30 not only has a heat-conducting function, but also can absorb and buffer the impact force received by the battery module 20 to some extent, thereby improving the anti-vibration capability of the entire battery pack 100.

[0054] It should be noted that the shape and size of the elastic heat-conducting part 30 can be set as needed, and the present application does not limit this.

[0055] In an embodiment, the other of the two adjacent liquid cooling plates 10 is provided with a first groove on the side facing the top of the battery module 20, the first groove is in the first heat exchange area, and the elastic heat conduction part 30 is in the first groove. In this way, the elastic heat conduction part 30 can directly transfer heat to the liquid cooling plate 10, improving the heat dissipation efficiency. The design of the first groove can prevent the elastic heat conduction part 30 from falling off or loosening during long-term use, which helps to maintain good heat exchange between the battery module 20 and the liquid cooling plate 10, reduces the working temperature of the battery module 20, and improves the energy conversion efficiency of the battery pack 100.

[0056] Referring to Figures 3 to 5 In an embodiment, the battery pack 100 further includes a plurality of heat conduction parts 40, and the bottom is in thermal conductive connection with the corresponding liquid cooling plate 10 through the heat conduction part 40. In this way, the heat conduction part 40 acts as a bridge for heat conduction, and can quickly transfer the heat generated at the bottom of the battery module 20 to the liquid cooling plate 10. This design significantly shortens the heat transfer path, thereby improving the heat dissipation efficiency. Since the heat conduction part 40 can effectively transfer heat, the thermal stress generated between the battery module 20 and the liquid cooling plate 10 due to temperature differences can be significantly reduced, which helps to prolong the service life of the battery pack 100 and reduce failures and damage caused by thermal stress.

[0057] It should be noted that the type of heat conduction part 40 can be selected as needed, for example, the heat conduction part 40 can include at least one of a heat-conducting structural adhesive or a heat-conducting filler. Of course, in other embodiments, the heat conduction part 40 can include a heat-conducting structural adhesive and a heat-conducting gel, which are stacked in sequence. Specifically, the type of heat conduction part 40 is not limited in the present application.

[0058] Specifically, in the embodiment of the present application, the heat conduction part 40 can include a heat-conducting structural adhesive, so that the heat-conducting structural adhesive has excellent heat conduction performance and can quickly conduct heat from a high-temperature area to a low-temperature area. In the battery pack 100, the heat-conducting structural adhesive can act as a heat conduction medium between the battery cell and the heat dissipation component, effectively conducting the heat generated by the battery module 20 to the liquid cooling plate 10, achieving rapid heat transfer and heat dissipation. This efficient heat dissipation method helps to reduce the working temperature of the battery pack 100 and improve the energy conversion efficiency and stability of the battery pack 100. The heat-conducting structural adhesive not only has heat conduction performance, but also has good adhesion performance, which can bond and fix the battery module 20 and the liquid cooling plate 10. This structure not only helps to resist external impact and vibration, improves 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. The heat-conducting structural adhesive can be directly coated between the bottom of the battery module 20 and the liquid cooling plate 10, forming a thin heat-conducting layer. This design not only reduces the assembly steps and costs in the production process, but also helps to improve production efficiency.

[0059] In an embodiment, the thickness of the heat conduction member 40 is H2, where 3mm≤H2≤5mm. In this way, the thickness of the heat conduction member 40 is in the range of 3mm to 5mm, so that the heat conduction member 40 can effectively transfer the heat generated by the battery module 20. The thickness of the heat conduction member 40 in the range of 3mm to 5mm helps to control the thermal resistance and avoid heat accumulation during heat conduction, which helps to maintain the working temperature of the battery module 20 stable and prevent performance degradation or damage caused by overheating. The thickness of the heat conduction member 40 in the range of 3mm to 5mm can provide sufficient structural strength to resist vibration and impact from the external environment, which helps to protect the battery module 20 from damage and ensure the reliability and durability of the battery pack 100.

[0060] In addition, as the thickness of the heat conduction member 40 increases, the conduction path of heat in the heat conduction material also increases. When the thickness of the heat conduction member 40 is greater than 5mm, it will cause the efficiency of heat transfer to be reduced, so that the heat generated by the battery module 20 cannot be quickly transferred to the liquid cooling plate 10, thereby affecting the heat dissipation performance of the battery pack 100. When the thickness of the heat conduction member 40 is greater than 5mm, the thermal resistance of the heat conduction member 40 will increase, so that heat is more likely to accumulate during transmission, which may cause the working temperature of the battery module 20 to rise, thereby causing performance degradation, shortened life, and even safety hazards. Although increasing the thickness of the heat conduction member may improve the structural strength to some extent, when the thickness of the heat conduction member 40 is greater than 5mm, it may increase the production cost. When the thickness of the heat conduction member 40 is less than 3mm, the heat conduction member 40 may not be able to withstand a large pressure or impact force, so that the battery module 20 is prone to deformation or damage. The heat conduction member 40 is usually made of high molecular materials, which are prone to aging under long-term use or high temperature environment. The thinner heat conduction layer may be more susceptible to aging, resulting in a decrease in its heat conduction performance and structural strength.

[0061] It should be noted that the thickness of the heat conduction member 40 can be 3mm, 3.5mm, 3.9mm, 4mm, 4.3mm, 4.5mm, 4.8mm or 5mm, etc. Specifically, the present application does not limit this.

[0062] Referring to Figure 3 and Figure 5In an embodiment, one of the two adjacent liquid cooling plates 10 has a second side surface arranged towards the bottom of the battery module 20, the second side surface has a second heat exchange area, along the thickness direction of the liquid cooling plate 10, the projection of the battery module 20 on one of the two adjacent liquid cooling plates 10 is located in the second heat exchange area, and at least part of the heat conduction member 40 covers the second heat exchange area. In this way, since the battery module 20 is projected in the second heat exchange area and the heat conduction member 40 at least partially covers the second heat exchange area, the heat conduction member 40 can more effectively transfer the heat generated by the battery module 20 to the liquid cooling plate 10 and dissipate the heat through the cooling liquid as a bridge for heat conduction. This design optimizes the heat flow path and improves the heat dissipation efficiency of the battery module 20.

[0063] It should be noted that the shape and size of the heat conduction member 40 can be set as needed, and the present application does not limit it.

[0064] In an embodiment, one of the two adjacent liquid cooling plates 10 has a second side surface arranged towards the bottom of the battery module 20, the second side surface has a second heat exchange area, along the thickness direction of the liquid cooling plate 10, the projection of the battery module 20 on one of the two adjacent liquid cooling plates 10 is located in the second heat exchange area, and at least part of the heat conduction member 40 covers the second heat exchange area. In this way, since the battery module 20 is projected in the second heat exchange area and the heat conduction member 40 at least partially covers the second heat exchange area, the heat conduction member 40 can more effectively transfer the heat generated by the battery module 20 to the liquid cooling plate 10 and dissipate the heat through the cooling liquid as a bridge for heat conduction. This design optimizes the heat flow path and improves the heat dissipation efficiency of the battery module 20.

[0065] Referring to Figure 4In an embodiment, the battery pack 100 further comprises a plurality of side frames 50, each of the side frames 50 is arranged between two adjacent liquid cooling plates 10, and each of the side frames 50 is connected to the two liquid cooling plates 10 at two ends thereof. The plurality of side frames 50 and the plurality of liquid cooling plates 10 jointly form a plurality of battery compartments 60, and the plurality of battery modules 20 are arranged in the plurality of battery compartments 60. In this way, the side frames 50, as an important component of the battery pack 100, can enhance the overall structural strength of the battery pack 100. By connecting the side frames 50 to the liquid cooling plates 10, a more robust frame of the battery pack 100 can be formed, and the impact resistance and compression resistance of the battery pack 100 can be improved. The side frames 50 can protect the battery modules 20 from external impacts and vibrations. During vehicle driving, the side frames 50 can effectively absorb and disperse collision energy, and protect the battery modules 20 from damage. The close cooperation between the side frames 50 and the liquid cooling plates 10 can form a sealed battery compartment 60 environment, and reduce the risk of failure of the battery modules 20 caused by external factors (such as moisture, dust, etc.). Since the side frames 50 and the liquid cooling plates 10 are both independent detachable components, only the damaged components need to be replaced during maintenance, and the entire battery pack 100 does not need to be replaced. Since the battery modules 20 are not all surrounded by the side frames 50, when the battery modules 20 generate expansion force during charging and discharging, the side frames 50 can resist such expansion force, and prevent the battery modules 20 from deforming or rupturing. The close connection between the side frames 50 and the liquid cooling plates 10 forms a stable frame structure, which can effectively disperse and resist the impact of the expansion force of the battery modules 20 on the overall structure of the battery pack 100, and improve the stability and safety of the battery pack 100.

[0066] Referring to Figure 6 In an embodiment, the side frame 50 comprises a plurality of beam bodies 51, each of the beam bodies 51 comprises a beam edge 511 and two protruding portions 512, the beam edge 511 has two first side walls arranged away from each other along the extension direction of the liquid cooling plate 10, and the two protruding portions 512 are protruded from the two first side walls, and each of the protruding portions 512 is welded and fixed to the liquid cooling plate 10. In this way, by arranging the protruding portions 512, when the beam edge 511 is welded to the liquid cooling plate 10, the welding mainly occurs between the protruding portions 512 and the liquid cooling plate 10. Since the protruding portions 512 are relatively thin and have small heat capacity, the protruding portions 512 are easy to heat up and reach the melting temperature, thereby forming a weld, ensuring that when the longitudinal beam reaches the required penetration, the temperature rise of the liquid cooling plate 10 still remains within the allowable range, avoiding the risk of overheating and weld penetration. In this way, the balance between the weld penetration of the beam edge and the non-penetration of the liquid cooling plate 10 can be achieved, the risk of weld penetration of the liquid cooling plate 10 is reduced, and the welding quality is improved.

[0067] In an embodiment, in the thickness direction of the liquid cooling plate 10, the size of the protruding portion 512 is H3, where 1.5 mm≤H3≤2.5 mm, so that in the thickness direction of the liquid cooling plate 10, the size range of the protruding portion 512 has an important influence on the welding effect. If the size of the protruding portion 512 is too small, it may cause the heat capacity to be too small during welding, making it difficult to form a stable weld, or the protruding portion 512 may be completely melted before reaching the required penetration of the side frame 50, affecting the welding quality. If the size is too large, the temperature rise of the protruding portion 512 will be slower under the same welding energy, resulting in an extended welding time, and it may conduct too much heat to the liquid cooling plate 10, increasing the risk of welding through the liquid cooling plate 10. This size range is determined by considering welding efficiency, penetration control, and liquid cooling plate 10 protection, etc. It helps to meet the penetration requirements of the side frame 50 while ensuring that the temperature rise of the liquid cooling plate 10 is within the allowable range, improving the success rate and quality of welding.

[0068] It should be noted that in the thickness direction of the liquid cooling plate 10, the size of the protruding portion 512 can be 1.5 mm, 1.6 mm, 1.9 mm, 2 mm, 2.3 mm, 2.4 mm, or 2.5 mm, etc. Specifically, the present application does not limit this.

[0069] In the extension direction of the liquid cooling plate 10, the distance of the protruding portion 512 from the protruding beam edge 511 is L, where 2 mm≤L≤4 mm, so that in the extension direction of the liquid cooling plate 10, the distance of the protruding portion 512 from the protruding beam edge 511 has an important influence on the realization of the technical effect, as well as the connection strength of the side frame 50 and the liquid cooling plate 10. If the distance is too small, it may increase the proportion of heat conducted to the beam edge 511, and the thicker beam edge 511 will have a slower temperature rise, making it difficult for the side frame 50 to reach the penetration. Correspondingly, there is a risk of welding through the liquid cooling plate 10. If the distance is too large, it will affect the compactness of the overall structure of the side frame 50, and it will be difficult to accurately control the heat concentration of the protruding portion 512 during welding, which may cause uneven welding, affecting the weld quality and penetration control of the side frame 50, and may cause uneven stress transmission between the liquid cooling plate 10 and the side frame 50 when subjected to external forces, thereby affecting the connection strength of the side frame 50 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 of the protruding portion 512 from the protruding beam edge 511 is in the range of 2 mm to 4 mm, which helps to control the heat concentration area during welding, ensures that a weld is mainly formed between the protruding portion 512 and the liquid cooling plate 10, realizes the balance between the welding penetration of the side frame 50 and the non-welding through of the liquid cooling plate 10, and guarantees the connection strength of the liquid cooling plate 10 and the side frame 50, thereby guaranteeing the structural strength of the battery pack 100.

[0070] In a third aspect, the embodiments of the utility model further propose a power utilization equipment, including the battery pack 100 as above, the specific structure of battery pack 100 refers to the above embodiment, because the power utilization equipment adopts all the technical solutions of the above all embodiments, thus at least has all the beneficial effects brought by the technical solutions of the above embodiments, here will not repeat.

[0071] It needs to be explained that the power utilization equipment can include vehicles, energy storage power sources, consumer electronics, medical devices, smart cities and the like.

[0072] The above has carried out the detailed introduction to the utility model embodiment, the principle and implementation mode of the utility model have been set forth in this paper by the application of specific examples, the above embodiment is only for helping to understand the method of the utility model and its core thought; simultaneously, for the person skilled in the art, according to the thought of the utility model, there will be changes in specific implementation mode and application range, and the above is described, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises: a plurality of liquid cooling plates arranged in sequence at intervals; a plurality of battery modules, each of which is arranged between two adjacent liquid cooling plates, and each battery module has a top and a bottom along the thickness direction of the liquid cooling plate, and the bottom is in thermal contact with one of the two adjacent liquid cooling plates; a plurality of elastic thermal conductive parts, each of which is arranged between the top of the battery module and the other of the two adjacent liquid cooling plates; wherein the other of the two adjacent liquid cooling plates is provided with a first groove on the side facing the top of the battery module, and the elastic thermal conductive part is arranged in the first groove.

2. The battery pack of claim 1, wherein, The elastic thermal conductive part comprises a thermal conductive gel.

3. The battery pack of claim 1, wherein, The thickness of the elastic thermal conductive part is H1, and 3mm≤H1≤5mm.

4. The battery pack of any one of claims 1 to 3, wherein, The other of the two adjacent liquid cooling plates has a first side surface arranged towards the top of the corresponding battery module, and the first side surface has a first heat exchange area; The projection of the battery module on the other of the two adjacent liquid cooling plates is in the first heat exchange area along the thickness direction of the liquid cooling plate; At least part of the elastic thermal conductive part covers the first heat exchange area.

5. The battery pack of claim 4, wherein, The first groove is in the first heat exchange area.

6. The battery pack of claim 1, wherein, The bottom of each battery module is in thermal contact with the corresponding liquid cooling plate through a plurality of thermal conductive parts.

7. The battery pack of claim 6, wherein, The thermal conductive part comprises at least one of a thermal conductive structural adhesive or a thermal conductive filler.

8. The battery pack of claim 6, wherein, The thickness of the thermal conductive part is H2, and 3mm≤H2≤5mm.

9. The battery pack of any one of claims 6-8, wherein, One of the two adjacent liquid cooling plates has a second side surface arranged towards the bottom of the battery module, and the second side surface has a second heat exchange area; The projection of the battery module on one of the two adjacent liquid cooling plates is in the second heat exchange area along the thickness direction of the liquid cooling plate; At least part of the thermal conductive part covers the second heat exchange area.

10. The battery pack of claim 9, wherein, One of the two adjacent liquid cooling plates is provided with a second groove on the side facing the bottom of the battery module, and the second groove is in the second heat exchange area; The thermal conductive part is arranged in the second groove.

11. The battery pack of any one of claims 1-3, wherein, A plurality of side frames are arranged between the two adjacent liquid cooling plates, and each side frame is connected to the two liquid cooling plates at both ends, and a plurality of battery compartments are formed by the plurality of side frames and the plurality of liquid cooling plates. A plurality of battery modules are arranged in the plurality of battery compartments.

12. An electrical device, characterized by The battery pack comprises any one of claims 1-11. The battery pack comprises any one of claims 1-11.

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