Cooling structure of battery pack, battery pack and electric device

Abstract

The utility model provides a kind of cooling structure of battery pack, battery pack and electric equipment, wherein the cooling structure of battery pack, comprising: bottom heat exchange plate, bottom heat exchange plate is provided with multiple liquid inlet flow channels communicated with first liquid inlet and multiple liquid return flow channels communicated with first liquid outlet;Every side heat exchange plate is provided with side cold flow channel, and the two ends of every side heat exchange plate are respectively provided with second liquid inlet and second liquid outlet communicated with side cold flow channel, multiple second liquid inlets of multiple side heat exchange plates at second side are communicated with liquid inlet flow channel, and multiple second liquid outlets of multiple side heat exchange plates at first side are communicated with liquid return flow channel;Wherein, the sum S1 of the cross-sectional area of all side cold flow channels and the sum S2 of the cross-sectional area of all liquid inlet flow channels satisfy: 0.1≤S1 / S2≤0.7.The technical scheme of the application effectively solves the problem that the cooling capacity is difficult to meet the heat dissipation requirement when using pure bottom cold plate cooling scheme in related technology.

Description

Technical Field

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

[0002] Overheating of the battery pack during fast charging of electric vehicle power battery packs is a key technical challenge. When using a pure bottom-mounted cooling solution, its cooling capacity is often insufficient to meet the heat dissipation requirements under fast charging conditions, which leads to a rapid rise in battery temperature and subsequently triggers a series of serious problems.

[0003] First, excessively high battery temperatures directly impact charging and discharging efficiency and lifespan, accelerating battery performance degradation. Second, sustained high temperatures lead to irreversible chemical changes, such as electrolyte decomposition and damage to the positive and negative electrode materials. More seriously, when battery temperatures exceed safety thresholds, a thermal runaway chain reaction may be triggered, manifesting as a rapid rise in internal battery temperature and rapid gas expansion, potentially leading to battery fires or explosions. From a thermodynamic perspective, Joule heat, polarization heat, and reaction heat generated inside the battery accumulate rapidly during fast charging. Pure bottom-cooling plate solutions, due to their limited heat dissipation area and single heat conduction path, struggle to achieve efficient heat removal, exacerbating the risk of thermal runaway. Utility Model Content

[0004] The main objective of this invention is to provide a cooling structure for a battery pack, a battery pack, and electrical equipment, in order to solve the problem in related technologies where the cooling capacity is insufficient to meet heat dissipation requirements when a pure bottom cooling plate cooling scheme is used.

[0005] To achieve the above objectives, according to one aspect of the present invention, a cooling structure for a battery pack is provided, comprising: a bottom heat exchange plate having a first side and a second side disposed opposite to each other; a first liquid inlet and a first liquid outlet being provided on the first side; a plurality of liquid inlet channels communicating with the first liquid inlet and a plurality of liquid return channels communicating with the first liquid outlet being provided within the bottom heat exchange plate; the plurality of liquid inlet channels and the plurality of liquid return channels being connected at the second side via a confluence channel; the number of liquid return channels being less than the number of liquid inlet channels; and a plurality of side heat exchange plates, the plurality of side heat exchange plates being spaced apart. Multiple battery placement spaces are formed between the bottom heat exchange plate and multiple side heat exchange plates. Each side heat exchange plate is provided with a side cold flow channel. Each side heat exchange plate has a second liquid inlet and a second liquid outlet at both ends that are connected to the side cold flow channel. Multiple second liquid inlets on the second side of the multiple side heat exchange plates are connected to the liquid inlet flow channel. Multiple second liquid outlets on the first side of the multiple side heat exchange plates are connected to the liquid return flow channel. The sum of the cross-sectional areas S1 of all side cold flow channels and the sum of the cross-sectional areas S2 of all liquid inlet flow channels satisfy the following condition: 0.1≤S1 / S2≤0.7.

[0006] According to another aspect of the present invention, a battery pack is provided, including a frame and a cooling structure disposed on the frame, wherein the cooling structure is the cooling structure of the battery pack described above.

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

[0008] The technical solution of this utility model has the following beneficial effects: Since multiple second liquid inlets located on the second side of the multiple side heat exchange plates are connected to the liquid inlet channel, and multiple second liquid outlets located on the first side of the multiple side heat exchange plates are connected to the liquid return channel, the flow direction of the coolant in each liquid return channel is opposite to the flow direction of the coolant in the liquid inlet channel, which can ensure a reduction in the temperature difference within the battery pack. The technical solution of this application adopts a cooling scheme using a bottom heat exchange plate and multiple side heat exchange plates. Compared with the pure bottom cooling plate scheme in related technologies, this increases the heat exchange area, improves the cooling capacity, and easily meets heat dissipation requirements. Furthermore, the sum of the cross-sectional areas S1 of all side cooling channels and the sum of the cross-sectional areas S2 of all liquid inlet channels satisfy the condition: 0.1 ≤ S1 / S2 ≤ 0.7. This reduces the flow resistance of the coolant within the battery pack's cooling structure, increases the cooling effect of the battery pack's cooling structure, and better meets the heat dissipation requirements under different operating conditions. Attached Figure Description

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

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

[0011] Figure 2 It shows Figure 1 A bottom-view diagram of the battery pack;

[0012] Figure 3 A schematic diagram of the inlet and outlet channels within the bottom heat exchange plate of an embodiment of the battery pack according to the present invention is shown.

[0013] Figure 4 A three-dimensional structural diagram of the battery pack according to the present invention after cross-section is shown;

[0014] Figure 5 A detailed perspective view of the first conduit is shown in an embodiment of the battery pack according to the present invention.

[0015] Figure 6A detailed perspective view of the second conduit is shown in an embodiment of the battery pack according to the present invention.

[0016] The above figures include the following reference numerals:

[0017] 10. Frame; 11. Bottom heat exchange plate; 111. First side; 112. Second side; 113. First liquid inlet; 114. First liquid outlet; 115. Liquid inlet channel; 116. Liquid return channel; 117. Combination channel; 12. First pipeline; 121. Series pipeline; 122. Combination pipeline; 13. Second pipeline; 14. Battery placement space; 15. Side heat exchange plate; 151. Side cold channel; 152. Second liquid inlet; 153. Second liquid outlet; 16. Crossbeam; 17. Frame; 19. Longitudinal beam; 20. Battery module. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] According to one aspect of this application, a cooling structure for a battery pack is provided, such as... Figures 1 to 4 As shown, an embodiment of the cooling structure for the battery pack includes a bottom heat exchange plate 11 and multiple side heat exchange plates 15. The bottom heat exchange plate 11 has a first side 111 and a second side 112 arranged opposite to each other. A first liquid inlet 113 and a first liquid outlet 114 are provided on the first side 111. Multiple liquid inlet channels 115 that communicate with the first liquid inlet 113 and multiple liquid return channels 116 that communicate with the first liquid outlet 114 are provided inside the bottom heat exchange plate 11. The multiple liquid inlet channels 115 and the multiple liquid return channels 116 are connected at the second side 112 through a confluence channel 117. The number of liquid return channels 116 is less than the number of liquid inlet channels 115. Multiple side heat exchange plates 15 are spaced apart, forming multiple battery placement spaces 14 between the bottom heat exchange plate 11 and the multiple side heat exchange plates 15. Each side heat exchange plate 15 has a side cooling channel 151. Each side heat exchange plate 15 has a second liquid inlet 152 and a second liquid outlet 153 at both ends, communicating with the side cooling channel 151. The multiple second liquid inlets 152 located on the second side 112 of the multiple side heat exchange plates 15 are connected to the liquid inlet channel 115, and the multiple second liquid outlets 153 located on the first side 111 of the multiple side heat exchange plates 15 are connected to the liquid return channel 116. The sum of the cross-sectional areas S1 of all side cooling channels 151 and the sum of the cross-sectional areas S2 of all liquid inlet channels 115 satisfy the following condition: 0.1 ≤ S1 / S2 ≤ 0.7. The battery placement spaces 14 are used to place the batteries of the battery module 20.

[0022] It should be noted that the cross-sectional area of ​​each inlet channel 115 is the area of ​​the cross-section perpendicular to the flow direction of the coolant within the inlet channel 115. The cross-sectional area of ​​each return channel 116 is the area of ​​the cross-section perpendicular to the flow direction of the coolant within the return channel 116. The cross-sectional area of ​​each side cooling channel 151 is the area of ​​the cross-section perpendicular to the flow direction of the coolant within the side cooling channel 151.

[0023] In the embodiment of the battery pack cooling structure, the multiple second liquid inlets 152 of the multiple side heat exchange plates 15 located on the second side 112 are connected to the liquid inlet channel 115, and the multiple second liquid outlets 153 of the multiple side heat exchange plates 15 located on the first side 111 are connected to the liquid return channel 116. This ensures that the flow direction of the coolant in each liquid return channel 116 is opposite to the flow direction of the coolant in the liquid inlet channel 115, thereby reducing the temperature difference within the battery pack. The technical solution of this application employs a cooling scheme using a bottom heat exchange plate 11 and multiple side heat exchange plates 15. Compared to the pure bottom cooling scheme in related technologies, this increases the heat exchange area, improves the cooling capacity, and easily meets heat dissipation requirements. Furthermore, the sum of the cross-sectional areas S1 of all side cooling channels 151 and the sum of the cross-sectional areas S2 of all liquid inlet channels 115 satisfy the condition: 0.1≤S1 / S2≤0.7. This reduces the flow resistance of the coolant in the cooling structure of the battery pack, increases the cooling effect of the cooling structure of the battery pack, and is better able to meet the heat dissipation requirements under different operating conditions.

[0024] Since the number of return channels 116 is less than the number of inlet channels 115, the multiple second inlets 152 of the multiple side heat exchange plates 15 located on the second side 112 are connected to the inlet channels 115, and the multiple second outlets 153 of the multiple side heat exchange plates 15 located on the first side 111 are connected to the return channels 116. In this way, the coolant flows from the first side 111 through the inlet channels 115 to the second side 112, and then flows back to the first side 111 through the return channels 116 and the side heat exchange plates 15, thereby increasing the flow rate of the side heat exchange plates 15. Moreover, since the temperature of the cooling battery increases, but the flow rate is fast, the heat exchange effect is improved, which can ensure that the temperature difference of the battery pack is reduced.

[0025] like Figures 1 to 4 As shown, the sum of the cross-sectional areas S3 of all return liquid channels 116 and the sum of the cross-sectional areas S1 of all side cooling channels 151 satisfy the following condition: 0.3 ≤ S3 / S1 ≤ 0.7. By controlling the ratio of the cross-sectional areas of the return liquid channels 116 to the side cooling channels 151, the balance between the return flow rate of the return liquid channels 116 and the cooling efficiency of the side heat exchange plates 15 can be adjusted, thereby achieving temperature management and heat distribution control, ensuring the uniform temperature of each battery in the battery pack during fast charging, and avoiding local overheating.

[0026] In this embodiment, the flow direction of the coolant in the side cooling channel 151 of each side heat exchange plate 15 is consistent with the flow direction of the coolant in the return channel 116 of the bottom heat exchange plate 11. This reduces the overall flow resistance of the battery pack and ensures a smaller temperature difference within the battery pack. Figures 1 to 4 As shown, the sum of the cross-sectional areas of all return channels 116 (S3), the sum of the cross-sectional areas of all inlet channels 115 (S2), and the sum of the cross-sectional areas of all side cooling channels 151 (S3) satisfy the following condition: 0.3 ≤ (S1 + S3) / S2 ≤ 0.8. By adjusting (S1 + S3) / S2, the difference in the total cross-sectional areas of the inlet and outlet water is not significant, which can further optimize the distribution and flow efficiency of the coolant, reduce the overall flow resistance, improve the comprehensive performance of the cooling structure, and ensure effective heat dissipation under different operating conditions.

[0027] Furthermore, the sum of the cross-sectional areas S1 of all side cooling channels 151 satisfies: 200mm 2 ≤S1≤700mm 2 And / or, the sum of the cross-sectional areas S2 of all inlet channels 115 satisfies: 800mm 2 ≤S2≤2000mm 2 By limiting the specific range of the cross-sectional areas of the side cooling channel 151 and the liquid inlet channel 115, it is possible to ensure that the liquid cooling structure neither excessively increases flow resistance nor fails to meet high heat dissipation requirements, thereby improving the thermal management level of the battery pack. The sum of the cross-sectional areas S3 of all return channels 116 satisfies: 100mm² 2 ≤S3≤500mm 2 .

[0028] Specifically, the sum of the cross-sectional areas S1 of all the side cooling channels 151 is 200 mm. 2 Or 300mm 2 Or 400mm 2 Or 500mm 2 Or 600mm 2 Or 700mm 2 The sum of the cross-sectional areas S2 of all the liquid inlet channels 115 is 800 mm. 2 Or 900mm 2 Or 1000mm 2 Or 1100mm 2 Or 1200mm 2 Or 1300mm 2 Or 1400mm 2 Or 1500mm 2 Or 1600mm 2 Or 1700mm 2 Or 1800mm 2 Or 1900mm 2 Or 2000mm2 The sum of the cross-sectional areas of all return channels 116, S3, is 100 mm. 2 Or 200mm 2 Or 300mm 2 Or 400mm 2 Or 500mm 2 .

[0029] like Figure 1 As shown, multiple side heat exchange plates 15 are spaced apart along the width direction Y and length direction X of the bottom heat exchange plate 11. The second liquid outlet 153 and second liquid inlet 152 of two adjacent side heat exchange plates 15 spaced apart along the length direction of the bottom heat exchange plate 11 are connected. In this way, a portion of the multiple side heat exchange plates 15 can be arranged in parallel along the width direction Y of the bottom heat exchange plate 11, and another portion of the multiple side heat exchange plates 15 can be arranged in series along the length direction X of the bottom heat exchange plate 11, forming a continuous liquid cooling network, enhancing the lateral cooling effect, and improving the overall thermal conductivity efficiency of the battery pack.

[0030] like Figure 1 , Figure 5 and Figure 6 As shown, the second liquid inlets 152 of the multiple side heat exchange plates 15 located on the second side 112 are connected to the liquid inlet channel 115 via the first pipe 12. The second liquid outlets 153 of the multiple side heat exchange plates 15 located on the first side 111 are connected to the liquid return channel 116 via the second pipe 13. The line connecting the first pipe 12 and the liquid inlet channel 115 and the second pipe 13 and the liquid return channel 116 is inclined relative to the length direction of the bottom heat exchange plate 11. The inclined arrangement of the connecting line of the first pipe 12 and the second pipe 13 relative to the length direction of the bottom heat exchange plate 11 can improve the flow and distribution of the coolant, reduce dead zones, thereby improving the heat exchange efficiency of the multiple side heat exchange plates 15, while reducing the overall flow resistance, ensuring smoother operation of the cooling structure, and effectively controlling the temperature of the battery pack during high-speed charging.

[0031] like Figure 1 , Figure 5 and Figure 6 As shown, the first pipeline 12 includes a series pipeline 121 and a manifold 122 connected to the series pipeline 121. At least two second liquid inlets 152 located on the second side 112 of the plurality of side heat exchange plates 15 are connected to the series pipeline 121, and the manifold 122 is connected to the liquid inlet channel 115. The combination of the series pipeline 121 and the manifold 122 can ensure the distribution and convergence of coolant between the side heat exchange plates 15 and between the side heat exchange plates 15 and the bottom heat exchange plate 11, optimize the flow path of the coolant, and improve the overall cooling efficiency.

[0032] According to another aspect of this application, a battery pack is provided. An embodiment of the battery pack includes a frame 10 and a cooling structure disposed on the frame 10. The cooling structure is the cooling structure of the aforementioned battery pack. Because the cooling structure of the aforementioned battery pack can increase the heat exchange area and improve the cooling capacity compared to the pure bottom-cooling plate cooling scheme in related technologies, it easily meets heat dissipation requirements, enabling the battery pack including this cooling structure to achieve the same technical effects. The battery pack also includes a battery module 20 disposed within a battery placement space 14, the battery module 20 including a plurality of batteries.

[0033] like Figures 1 to 6 As shown, the frame 10 includes a frame body 17 and multiple crossbeams 16 and multiple longitudinal beams 19 disposed within the frame body 17. A bottom heat exchange plate 11 is connected to the bottom of the frame body 17. The multiple crossbeams 16 are spaced apart along the length of the bottom heat exchange plate 11, and the multiple longitudinal beams 19 are spaced apart along the width of the bottom heat exchange plate 11. Each side heat exchange plate 15 is connected between two adjacent crossbeams 16. The multiple longitudinal beams 19 divide the bottom heat exchange plate 11 into two parts, and the multiple side heat exchange plates 15 are respectively located on the two parts divided by the bottom heat exchange plate 11. Through the structural design of the crossbeams 16 and longitudinal beams 19 within the frame 10, not only is the mechanical strength of the battery pack strengthened, but the separation of the multiple side heat exchange plates 15 by the multiple longitudinal beams 19 optimizes the layout of the side heat exchange plates 15, achieving a more uniform cooling effect, reducing the temperature difference between batteries, and improving the overall thermal stability and charging efficiency of the battery pack.

[0034] In this embodiment, there is a gap between the side heat exchange plate 15 and the bottom heat exchange plate 11, which is greater than or equal to 10 mm and less than or equal to 30 mm. This gap, falling within the aforementioned range, ensures both good temperature uniformity and good heat exchange performance between the side heat exchange plate 15 and the bottom heat exchange plate 11. If the gap is less than 10 mm, the temperature at the battery corner will be lower than other parts, resulting in poor temperature uniformity; if the gap is greater than 30 mm, the heat exchange performance will be poor. Figures 1 to 6 As shown, multiple longitudinal beams 19 separate multiple liquid inlet channels 115, with the number of liquid inlet channels 115 on one side of the multiple longitudinal beams 19 being greater than the number of liquid inlet channels 115 on the other side of the multiple longitudinal beams 19. The specific layout of the longitudinal beams 19 can optimize the flow distribution of coolant inside the bottom heat exchange plate 11. By adjusting the number of liquid inlet channels 115 on both sides, a more balanced coolant flow can be formed inside the battery pack, further improving the bottom cooling efficiency.

[0035] The aforementioned battery can be a secondary battery or a primary battery; it can also be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this embodiment of the present invention is not limited in this regard. The battery can be cylindrical, flat, cuboid, or other shapes, and this embodiment of the present invention is not limited in this regard either. Batteries are generally classified into three types according to their packaging method: cylindrical batteries, square batteries, and pouch batteries, and this embodiment of the present invention is not limited in this regard either.

[0036] For example, a battery may include a casing, electrode assemblies, and an electrolyte. The casing houses the electrode assemblies and the electrolyte. The electrode assemblies consist of a positive electrode, a negative electrode, and a separator. The battery primarily operates by the movement of metal ions between the positive and negative electrode assemblies. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated positive current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0037] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0038] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0039] Batteries can be equipped with terminals or tabs that connect to the battery, serving as electrical connections. Furthermore, batteries typically have pressure relief sections. These sections release substances (such as gases, liquids, or particulate matter) from the battery's interior when internal pressure becomes excessive (e.g., during thermal runaway), reducing internal pressure and preventing rapid pressurization that could lead to dangerous accidents like battery explosions. For example, pressure relief sections can be explosion-proof valves or explosion-proof discs.

[0040] According to another aspect of this application, an electrical device is provided, an embodiment of which includes a battery pack, the battery pack being the aforementioned battery pack. The battery pack is capable of providing electrical energy to the electrical device. Since the aforementioned battery pack can solve the problem of poor heat exchange effect of the side cooling plate in the related art, the electrical device including this battery pack can solve the same technical problem.

[0041] According to another aspect of this application, an electrical device is provided, which includes a battery pack, the battery pack being the aforementioned battery pack. The battery pack is capable of providing electrical energy to the electrical device. Since the aforementioned battery pack can increase the heat exchange area and improve the cooling capacity compared to the pure bottom-cooling scheme in related technologies, it easily meets heat dissipation requirements, enabling the electrical device including this battery pack to achieve the same technical effects.

[0042] The electrical devices covered in this application may include, but are not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools. Vehicles may be fuel-powered vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0043] In the description of this utility model, it should be understood that "multiple" means a quantity of two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0044] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0045] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cooling structure for a battery pack, characterized in that, include: The bottom heat exchange plate (11) has a first side (111) and a second side (112) arranged opposite to each other. The first side (111) is provided with a first liquid inlet (113) and a first liquid outlet (114). The bottom heat exchange plate (11) is provided with a plurality of liquid inlet channels (115) that are all connected to the first liquid inlet (113) and a plurality of liquid return channels (116) that are all connected to the first liquid outlet (114). The plurality of liquid inlet channels (115) and the plurality of liquid return channels (116) are connected at the second side (112) through a confluence channel (117). The number of liquid return channels (116) is less than the number of liquid inlet channels (115). Multiple side heat exchange plates (15) are arranged at intervals. Multiple battery placement spaces (14) are formed between the bottom heat exchange plate (11) and the multiple side heat exchange plates (15). Each side heat exchange plate (15) is provided with a side cold flow channel (151). Each side heat exchange plate (15) has a second liquid inlet (152) and a second liquid outlet (153) communicating with the side cold flow channel (151) at both ends. Multiple second liquid inlets (152) of the multiple side heat exchange plates (15) located on the second side (112) are connected to the liquid inlet flow channel (115). Multiple second liquid outlets (153) of the multiple side heat exchange plates (15) located on the first side (111) are connected to the liquid return flow channel (116). Among them, the sum of the cross-sectional areas S1 of all the side cooling channels (151) and the sum of the cross-sectional areas S2 of all the liquid inlet channels (115) satisfy the following condition: 0.1≤S1 / S2≤0.

7.

2. The cooling structure of the battery pack according to claim 1, characterized in that, The sum of the cross-sectional areas S3 of all the return flow channels (116) and the sum of the cross-sectional areas S1 of all the side cooling flow channels (151) satisfy the following condition: 0.3 ≤ S3 / S1 ≤ 0.

7.

3. The cooling structure of the battery pack according to claim 2, characterized in that, The sum of the cross-sectional areas of all the return channels (116) S3, the sum of the cross-sectional areas of all the inlet channels (115) S2, and the sum of the cross-sectional areas of all the side cooling channels (151) S3 satisfy the following condition: 0.3≤(S1+S3) / S2≤0.

8.

4. The cooling structure of the battery pack according to claim 1, characterized in that, The sum of the cross-sectional areas S1 of all the aforementioned side cooling channels (151) satisfies: 200mm 2 ≤S1≤700mm 2 And / or, the sum of the cross-sectional areas S2 of all the said liquid inlet channels (115) satisfies: 800 mm 2 ≤S2≤2000mm 2 .

5. The cooling structure of the battery pack according to claim 1, characterized in that, Multiple side heat exchange plates (15) are spaced apart along the width direction and the length direction of the bottom heat exchange plate (11). The second liquid outlet (153) and the second liquid inlet (152) of two adjacent side heat exchange plates (15) spaced apart along the length direction of the bottom heat exchange plate (11) are connected.

6. The cooling structure of the battery pack according to claim 1, characterized in that, The second liquid inlet (152) of the plurality of side heat exchange plates (15) located on the second side (112) is connected to the liquid inlet channel (115) through the first pipe (12). The second liquid outlet (153) of the plurality of side heat exchange plates (15) located on the first side (111) is connected to the liquid return channel (116) through the second pipe (13). The line connecting the first pipe (12) and the liquid inlet channel (115) and the second pipe (13) and the liquid return channel (116) is inclined relative to the length direction of the bottom heat exchange plate (11).

7. The cooling structure of the battery pack according to claim 6, characterized in that, The first pipeline (12) includes a series pipeline (121) and a manifold (122) connected to the series pipeline (121). At least two of the second liquid inlets (152) located on the second side (112) of the plurality of side heat exchange plates (15) are connected to the series pipeline (121), and the manifold (122) is connected to the liquid inlet channel (115).

8. The cooling structure of the battery pack according to claim 1, characterized in that, The flow direction of the coolant in the side cooling channel (151) of each of the side heat exchange plates (15) is consistent with the flow direction of the coolant in the return channel (116) of the bottom heat exchange plate (11).

9. The cooling structure of the battery pack according to claim 1, characterized in that, There is a gap between the side heat exchange plate (15) and the bottom heat exchange plate (11), the gap being greater than or equal to 10 mm and less than or equal to 30 mm.

10. A battery pack, comprising a frame (10) and a cooling structure disposed on the frame (10), characterized in that, The cooling structure is the cooling structure of the battery pack according to any one of claims 1 to 9.

11. The battery pack according to claim 10, characterized in that, The frame (10) includes a frame (17) and a plurality of crossbeams (16) and a plurality of longitudinal beams (19) disposed within the frame (17). The bottom heat exchange plate (11) is connected to the bottom of the frame (17). The plurality of crossbeams (16) are spaced apart along the length direction of the bottom heat exchange plate (11), and the plurality of longitudinal beams (19) are spaced apart along the width direction of the bottom heat exchange plate (11). Each side heat exchange plate (15) is connected between two adjacent crossbeams (16). The plurality of longitudinal beams (19) divide the bottom heat exchange plate (11) into two parts, and the plurality of side heat exchange plates (15) are respectively located on the two parts divided by the bottom heat exchange plate (11).

12. The battery pack according to claim 11, characterized in that, The plurality of longitudinal beams (19) separate the plurality of liquid inlet channels (115), and the number of liquid inlet channels (115) located on one side of the plurality of longitudinal beams (19) is greater than the number of liquid inlet channels (115) located on the other side of the plurality of longitudinal beams (19).

13. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 10 to 12.

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