Battery pack

Abstract

The invention discloses a battery pack, which comprises a plurality of modules and a first liquid cooling assembly, the plurality of modules are arranged along the width direction of the modules, in the height direction of the modules, each module is provided with a pole terminal and a heat dissipation terminal which are oppositely arranged, the pole terminal is used for conducting electricity, the module comprises a plurality of single batteries, and the plurality of single batteries are arranged along the length direction of the modules; the first liquid cooling assembly is arranged between the modules in the width direction of the modules. Compared with the prior art, the first liquid cooling assembly is mainly used for cooling the side face of the battery module, the cooling efficiency is improved, and the risk of condensation is reduced; and the first liquid cooling assembly dissipates heat of the battery module, so that the heat dissipation capability of the battery pack is effectively enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] Lithium battery systems will generate a lot of heat in high-power scenarios, and continuous high-temperature operation will greatly affect their lifespan. Therefore, the development of advanced thermal management technology is of great significance for lithium battery systems to meet high-power scenarios and prolong their lifespan.

[0003] The mainstream thermal management technology nowadays usually adopts indirect liquid cooling technology or immersion liquid cooling technology, such as using a liquid cooling plate to dissipate heat from the battery. However, there are poles and aluminum bars on the top of the battery module, and the contact area between the battery module and the top liquid cooling plate is limited, which limits the heat dissipation effect. In addition, the top liquid cooling plate design will bring the risk of condensation. The immersion technology is not yet mature, and there is a problem of compatibility between the immersion liquid and the battery pack. Summary of the invention

[0004] An object of the present invention is to provide a battery pack, which aims to solve the technical problem of low heat dissipation efficiency in current liquid cooling technology.

[0005] To achieve the above-mentioned purpose, the present invention provides a solution: a battery pack, which includes a plurality of modules and a first liquid cooling assembly, wherein the plurality of modules are arranged along the width direction thereof, and in the height direction of the modules, the modules have a pole end and a heat dissipation end which are relatively arranged, and the pole end is used for conduction, and the modules include a plurality of single cells, and the plurality of single cells are arranged along the length direction of the modules; the first liquid cooling assembly is arranged between the modules along the width direction of the modules.

[0006] Optionally, the battery pack further includes a second liquid cooling component, and the second liquid cooling component is arranged on a side of the multiple modules close to the heat dissipation end.

[0007] Optionally, the battery pack further includes a heat spreader, and the heat spreader and the first liquid cooling assembly are alternately arranged between the modules.

[0008] Optionally, the number of the first liquid cooling components between adjacent heat sinks is at least two.

[0009] Optionally, the thickness of the heat spreader is D1, 1 mm≤D1≤4 mm.

[0010] Optionally, the single cell battery includes a first side surface and a second side surface, the first side surface is arranged in the thickness direction of the single cell battery, the second side surface is arranged in the length direction of the single cell battery, the area of ​​the first side surface is larger than the second side surface, and the heat spreader and the first liquid cooling assembly are respectively connected to the second side surfaces arranged opposite to each other.

[0011] Optionally, the battery pack further includes a first copper sheet, which is disposed between the single cells and in contact with the first side surface.

[0012] Optionally, the battery pack further includes a second copper sheet, wherein the second copper sheet is disposed between the second side surface and the first liquid cooling assembly, and the first liquid cooling assembly is in contact with the single battery through the second copper sheet.

[0013] Optionally, the first copper sheet and the second copper sheet are connected, and the first copper sheet and the second copper sheet are an integrally formed structure.

[0014] Optionally, the thickness of the first copper sheet is D2, the thickness of the second copper sheet is D3, and 0.5 mm≤D3≤D2≤3 mm.

[0015] Optionally, opposite ends of the first copper sheet are in contact with the first liquid cooling assembly and the heat spreader, respectively.

[0016] Optionally, in the height direction of the module, the height of the first copper sheet is the same as the height of the first side surface; and / or, in the width direction of the module, the width of the first copper sheet is the same as the width of the first side surface.

[0017] Optionally, the first liquid cooling component includes a first shell and a plurality of first baffles, the first shell is provided with a first liquid cooling cavity, the plurality of first baffles are arranged at intervals in the first liquid cooling cavity and connected to the first shell, the first baffles and the first shell form a first flow channel and a second flow channel for the circulation of cooling liquid, the first flow channel and the second flow channel are alternately arranged and connected end to end.

[0018] Optionally, the second liquid cooling component includes a second shell and a plurality of second baffles, the second shell is provided with a second liquid cooling cavity, the plurality of second baffles are arranged at intervals in the second liquid cooling cavity and connected to the second shell, the second baffles and the second shell form a third flow channel and a fourth flow channel for the circulation of cooling liquid, and the third flow channel and the fourth flow channel are alternately arranged and connected end to end.

[0019] Optionally, the first liquid cooling component includes a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are respectively connected to the first shell, the liquid inlet pipe is connected to the first flow channel located at the beginning, and the liquid outlet pipe is connected to the second flow channel located at the end, and the liquid inlet pipe and the liquid outlet pipe are relatively arranged in the height direction of the module and arranged at intervals.

[0020] The beneficial effects of the present invention are as follows: the present application provides a battery pack, comprising a plurality of modules and a first liquid cooling assembly, wherein the plurality of modules are arranged along the width direction thereof, and in the height direction of the modules, the modules have a pole end and a heat dissipation end arranged opposite to each other, the pole end is used for conducting electricity, the modules comprise a plurality of single cells, and the plurality of single cells are arranged along the length direction of the modules; the first liquid cooling assembly is arranged between the modules along the width direction of the modules. Compared with the prior art, the first liquid cooling assembly is mainly used to dissipate heat from the sides of the battery modules, improve the heat dissipation efficiency, and reduce the risk of condensation; the first liquid cooling assembly dissipates heat from the battery modules, effectively enhancing the heat dissipation capacity of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram of the assembly structure of a battery pack provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the exploded structure of a battery pack provided by an embodiment of the present invention;

[0024] Figure 3 is a schematic top view of a battery pack provided by an embodiment of the present invention;

[0025] Figure 4 yes Figure 2 A in the enlarged view;

[0026] Figure 5 yes Figure 3 The enlarged view of point B in the figure;

[0027] Figure 6 is a schematic structural diagram of a first copper sheet and a second copper sheet provided in an embodiment of the present invention;

[0028] Figure 7 is a schematic structural diagram of a second liquid cooling assembly provided in an embodiment of the present invention;

[0029] Figure 8It is a schematic structural diagram of a first liquid cooling assembly provided in an embodiment of the present invention.

[0030] Explanation of the accompanying drawings: 10, module; 20, second liquid-cooling assembly; 30, first liquid-cooling assembly; 40, heat sink; 50, first copper sheet; 60, second copper sheet; 101, single battery; 201, second shell; 202, second baffle; 203, third flow channel; 204, fourth flow channel; 301, first shell; 302, first baffle; 303, first flow channel; 304, second flow channel; 1011, first side; 1012, second side. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 2 An embodiment of the present application provides a battery pack, including a plurality of modules 10 and a first liquid cooling assembly 30. The plurality of modules 10 are arranged along the width direction thereof. In the height direction of the module 10, the module 10 has a pole end and a heat dissipation end that are relatively arranged. The pole end is used for conducting electricity. The module 10 includes a plurality of single cells 101. The plurality of single cells 101 are arranged along the length direction of the module 10. The first liquid cooling assembly 30 is arranged between the modules 10 along the width direction of the module 10.

[0033] In order to clearly describe the embodiments, Figure 2 Here, X represents the width direction of the module 10 , Y represents the length direction of the module 10 , and Z represents the height direction of the module 10 .

[0034] In actual applications, multiple single cells 101 are arranged in sequence along the length direction to form a module 10, and multiple modules 10 are arranged in sequence along the width direction to form multiple columns of modules 10. The first liquid cooling component 30 is arranged between the multiple columns of modules 10 along the width direction. For example, the first liquid cooling component 30 is arranged between each column of modules 10. The first liquid cooling component 30 cools the two sides of the module 10 along the width direction, achieving good heat dissipation and temperature equalization effects. The side of the single cell 101 is relatively smooth, without poles or aluminum bars and other equipment. The first liquid cooling component 30 is arranged on the side to increase the heat conduction area and avoid condensation. The first liquid cooling component 30 can also be arranged between every two or more columns (more than two columns) of modules 10, saving the number and cost of the first liquid cooling component 30, and reducing the overall weight of the battery pack. Compared with the prior art, the first liquid cooling component 30 is used to dissipate heat from the side of the battery module 10, improve heat dissipation efficiency, reduce the risk of condensation, and enhance the heat dissipation capacity of the battery pack.

[0035] Please refer again Figure 2 The battery pack also includes a second liquid cooling component, which is arranged on one side of the multiple modules near the heat dissipation end. The heat dissipation end of the module 10 does not have a pole and an aluminum row. The second liquid cooling component 20 is arranged at the heat dissipation end to increase the contact area between the module 10 and the second liquid cooling component 20 and improve the heat dissipation efficiency. The second liquid cooling component 20 is mainly used to dissipate heat at the end of the battery module 10 where no pole is set, thereby increasing the heat dissipation area. The first liquid cooling component 30 is mainly used to dissipate heat from the side of the battery module 10 to improve the heat dissipation efficiency. The second liquid cooling component 20 and the first liquid cooling component 30 jointly dissipate heat from the battery module 10, further enhancing the heat dissipation capacity of the battery pack.

[0036] Please refer again Figure 2 The battery pack also includes a heat spreader 40 , and the heat spreader 40 and the first liquid cooling assembly 30 are alternately arranged between the modules 10 .

[0037] In actual applications, the heat spreader 40 and the first liquid cooling component 30 are alternately arranged between the modules 10, so that the first liquid cooling component 30 is arranged between every two columns of modules 10, saving the use cost of the first liquid cooling component 30, and the heat spreader 40 is arranged between the modules 10. The heat spreader 40 can not only balance the temperature between two adjacent columns of modules 10, but also balance the temperature of multiple single cells 101 in each column of modules 10. Through the good thermal conductivity of the heat spreader 40, the heat from the higher temperature area is quickly transferred to the lower temperature area, so that the temperature of each battery cell in the module 10 tends to be consistent, or the temperature between two adjacent columns of modules 10 tends to be consistent.

[0038] Please refer again Figure 2 , the number of first liquid cooling components 30 between adjacent heat sinks 40 is at least two.

[0039] In practical applications, the number of columns of the module 10 is usually multiple columns. For example, when the number of columns of the module 10 is four columns, the multiple columns of modules 10 are set as the first column, the second column, the third column and the fourth column along the width direction of the module 10, wherein the first column and the fourth column are located at the outermost side, and the first liquid cooling assembly 30 is provided on the outer side of the first column and the fourth column, and the heat spreader 40 and the first liquid cooling assembly 30 are alternately arranged between the modules 10, that is, the heat spreader 40 is provided between the first column and the second column, and between the third column and the fourth column; because the temperature of the module 10 located in the middle part (the part between the second column and the third column) is relatively high during the use of the battery pack, two or more first liquid cooling assemblies 30 can be provided between the second column and the third column to reduce the temperature of the module 10 in the middle part and reduce the temperature difference between various parts of the battery pack.

[0040] It should be noted that the configuration of the first liquid cooling assembly 30 is not limited to the above configuration, and the specific configuration is based on the actual number of modules 10 columns.

[0041] In one embodiment, the thickness of the heat spreader 40 is D1, 1 mm ≤ D1 ≤ 4 mm. In practical applications, the thickness of the heat spreader 40 has an important influence on the heat conduction efficiency. A thinner heat spreader 40 usually has certain advantages in heat conduction speed. This is because when heat is conducted in a solid material, the shorter the distance, the smaller the thermal resistance; however, a too thin heat spreader 40 may not provide enough heat capacity to buffer heat fluctuations. When a heat source generates a large amount of heat instantly, a too thin heat spreader 40 may cause the temperature to rise rapidly due to its own insufficient heat capacity, and it is impossible to effectively absorb and diffuse heat. In addition, considering the overall size of the battery pack, the thickness of the heat spreader 40 needs to be strictly set. Controlling the thickness of the heat spreader 40 between 1 mm and 4 mm can better distribute the heat evenly across the entire plane on the one hand, and save battery pack design space on the other hand, reducing the total volume of the battery pack.

[0042] See also Figure 3 and Figure 4 The single cell 101 includes a first side surface 1011 and a second side surface 1012. The first side surface 1011 is arranged in the thickness direction of the single cell 101, and the second side surface 1012 is arranged in the length direction of the single cell 101. The area of ​​the first side surface 1011 is larger than the second side surface 1012. The heat spreader 40 and the first liquid cooling assembly 30 are respectively connected to the second side surface 1012 arranged opposite to each other.

[0043] In order to clearly describe the embodiments, Figure 3 X represents the length direction of the single battery 101 , and Y represents the thickness direction of the single battery 101 .

[0044] In practical applications, the single cell 101 may be a square cell having a larger first side 1011 and a smaller second side 1012. The heat spreader 40 and the first liquid cooling assembly 30 are both arranged on the second side 1012, which can save the use area of ​​the heat spreader 40 and the first liquid cooling assembly 30 and further reduce the design cost.

[0045] Furthermore, since the thermal conductivity of the square battery in the thickness direction is much smaller than that in the height and width directions, the thermal conductivity of the battery cell in the height and width directions is usually 15W / (Km), and the thermal conductivity in the thickness direction is only about 2W / (Km). Therefore, providing a first liquid cooling assembly 30 and a heat spreader 40 on the second side 1012 can improve the efficiency of heat extraction from the single battery 101.

[0046] See also Figure 5 and Figure 6 The battery pack further includes a first copper sheet 50 , which is disposed between the single batteries 101 and in contact with the first side surface 1011 .

[0047] Specifically, along the thickness direction of the single cell 101, the first copper sheet 50 is arranged between two adjacent single cells 101 and in contact with the first side surface 1011. The first copper sheet 50 has good thermal conductivity. It is arranged between the single cells 101 to achieve a thermal conductivity effect and balance the temperature between multiple single cells 101. In addition, the copper sheet has a low cost. The copper sheet is arranged on the larger first side surface 1011, which achieves the effect of balancing the temperature and saves material costs. At the same time, the first copper sheet 50 can be combined with the heat spreader on the second side surface 1012 to achieve better heat dissipation performance within a limited cost.

[0048] Please refer again Figure 6 The battery pack further includes a second copper sheet 60 , which is disposed between the second side surface 1012 and the first liquid cooling assembly 30 , and the first liquid cooling assembly 30 is in contact with the single battery 101 through the second copper sheet 60 .

[0049] In practical applications, in order to improve the heat exchange efficiency between the module 10 and the first liquid cooling component 30, the present application also provides a second copper sheet 60, which is arranged between the second side 1012 and the first liquid cooling component 30. The second copper sheet 60 itself has good thermal conductivity to transfer the heat of the module 10 to the first liquid cooling component 30, thereby enhancing the heat dissipation function of the first liquid cooling component 30.

[0050] Please refer again Figure 6The first copper sheet 50 and the second copper sheet 60 are connected, and the first copper sheet 50 and the second copper sheet 60 are an integrally formed structure, and the first copper sheet 50 and the second copper sheet 60 form a similar L-shaped structure. In practical applications, the first copper sheet 50 and the second copper sheet 60 can be formed by an integrally formed process, which reduces the number of parts and assembly procedures, shortens the production cycle, and improves production efficiency.

[0051] In one embodiment, the thickness of the first copper sheet 50 is D2, the thickness of the second copper sheet 60 is D3, and 0.5 mm ≤ D3 ≤ D2 ≤ 3 mm. D2 can be 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.6 mm, 2 mm, 2.4 mm, 2.8 mm, 3.0 mm, etc. D3 can be 0.5 mm, 0.7 mm, 1 mm, 1.1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.7 mm, 3.0 mm, etc.

[0052] In practical applications, a thick copper sheet will affect the heat transfer efficiency, while a thin copper sheet will heat up too quickly, which may cause local temperature unevenness during the heat transfer process. Considering the overall design size of the battery pack, the size of the first copper sheet 50 and the second copper sheet 60 is most suitable to be controlled between 0.5 mm and 3 mm, which can achieve heat transfer and ensure that the overall size and weight of the battery pack are within the normal range.

[0053] At the same time, since the second copper sheet 60 is arranged on the second side 1012, that is, the second copper sheet 60 increases the length of the single battery 101, and since the single battery 101 is longer in the length direction, the size of the battery pack along this direction is larger. Therefore, the thickness of the second copper sheet 60 can be set to be thinner than the first copper sheet 50, which is beneficial to saving the size of the battery pack and improving the heat dissipation efficiency between the first liquid cooling component 30 and the module 10.

[0054] In one embodiment, opposite ends of the first copper sheet 50 are in contact with the first liquid cooling assembly 30 and the heat spreader 40, respectively. Specifically, along the width direction of the module 10, the first liquid cooling assembly 30 and the heat spreader 40 are connected to both sides of the module 10 located in the middle, respectively. When the module 10 in this part is connected to the first copper sheet 50, the two ends of the first copper sheet 50 are also connected to the first liquid cooling assembly 30 and the heat spreader 40 on both sides of the module 10, respectively. This arrangement enables the first copper sheet 50 to directly transfer the temperature generated by the module 10 to the first liquid cooling assembly 30 and the heat spreader 40, thereby improving the heat dissipation speed.

[0055] At the same time, in the height direction of the module 10, the height of the first copper sheet 50 can be the same as the height of the first side surface 1011. The first copper sheet 50 and the module 10 exchange heat through the heat conduction area, so the larger the contact area between the first copper sheet 50 and the first side surface 1011, the more heat can be transferred per unit time. The large area of ​​the copper sheet provides a larger surface to contact with the module 10, thereby accelerating the heat dissipation.

[0056] In addition, in the width direction of the module 10, the width of the first copper sheet 50 is the same as the width of the first side surface 1011. In addition to increasing the contact area between the first copper sheet 50 and the module 10 in the height direction, the area of ​​the first copper sheet 50 can also be increased in the width direction to further improve the heat transfer efficiency between the first copper sheet 50 and the module 10, achieving an effect similar to the above.

[0057] See also Figure 7 The second liquid cooling assembly 20 includes a second shell 201 and a plurality of second baffles 202. The second shell 201 is provided with a second liquid cooling cavity. The plurality of second baffles 202 are arranged at intervals in the second liquid cooling cavity and connected to the second shell 201. The second baffles 202 and the second shell 201 form a third flow channel 203 and a fourth flow channel 204 for the circulation of cooling liquid. The third flow channel 203 and the fourth flow channel 204 are alternately arranged and connected end to end.

[0058] In practical applications, multiple second baffles 202 can be arranged in sequence along the width direction or the length direction of the second shell 201, and a third flow channel 203 or a fourth flow channel 204 is formed between two adjacent second baffles 202. The third flow channel 203 and the fourth flow channel 204 are used for circulating the coolant. During the flow of the coolant, the heat generated by the module 10 is continuously taken away to achieve the heat dissipation effect of the battery pack. The third flow channel 203 and the fourth flow channel 204 are staggered and connected end to end, which increases the heat dissipation area of ​​the second liquid cooling component 20 and the module 10, improves the smoothness and flow speed of the coolant flowing in the second liquid cooling component 20, and accelerates the heat dissipation efficiency of the second liquid cooling component 20.

[0059] See also Figure 8 The first liquid cooling assembly 30 includes a first shell 301 and a plurality of first baffles 302. The first shell 301 is provided with a first liquid cooling cavity. The plurality of first baffles 302 are arranged at intervals in the first liquid cooling cavity and connected to the first shell 301. The first baffles 302 and the first shell 301 form a first flow channel 303 and a second flow channel 304 for the circulation of cooling liquid. The first flow channel 303 and the second flow channel 304 are alternately arranged and connected end to end.

[0060] In actual applications, multiple first baffles 302 can be arranged in sequence along the width direction or the length direction of the first shell 301, and a first flow channel 303 or a second flow channel 304 is formed between two adjacent first baffles 302. The first flow channel 303 and the second flow channel 304 are staggered and connected end to end, which increases the heat dissipation area of ​​the first liquid cooling component 30 and the module 10, improves the smoothness and flow speed of the coolant flowing in the first liquid cooling component 30, and accelerates the heat dissipation efficiency of the first liquid cooling component 30.

[0061] It should be noted that a plurality of first shells 301 may be disposed on the second shell 201 , so that a plurality of modules 10 may be disposed on the same second shell 201 , and the plurality of modules 10 may share a liquid cooling plate, thereby improving the space utilization of the battery pack.

[0062] The first liquid cooling component 30 should also include a liquid inlet pipe and a liquid outlet pipe, which are respectively connected to the first shell 301, the liquid inlet pipe is connected to the first flow channel 303 located at the beginning, and the liquid outlet pipe is connected to the second flow channel 304 located at the end, and the liquid inlet pipe and the liquid outlet pipe are relatively arranged in the height direction of the module 10 and arranged at intervals.

[0063] In practical applications, the first liquid cooling component 30 also includes a liquid driving member connected to the liquid inlet pipe or the liquid outlet pipe. The first flow channel 303 and the second flow channel 304 are staggered and connected end to end. Therefore, along the flow direction of the coolant, the first flow channel 303 at the beginning and the second flow channel 304 at the end are respectively formed with a start and an end. The liquid inlet pipe is connected to the start, and the liquid outlet pipe is connected to the end. The liquid driving member drives the coolant to enter the start from the liquid inlet pipe, and then flows through the first flow channel 303 and the second flow channel 304 in sequence. When the coolant is in the first flow channel 303 and the second flow channel 304, it exchanges heat with the module 10 through the first shell 301, takes away the heat generated by the module 10 when working, and finally flows out from the liquid outlet pipe to complete the cooling work. Among them, the liquid driving member can adopt a structure such as a pump body.

[0064] Furthermore, the first flow channel 303 and the second flow channel 304 usually extend in the height direction of the module 10. Since hot air rises and cold air falls, arranging the first flow channel 303 and the second flow channel 304 in the height direction can form natural convection. Therefore, the liquid inlet pipe and the liquid outlet pipe can be relatively arranged in the height direction of the module 10, which is conducive to the smooth flow of the coolant in the first flow channel 303 and the second flow channel 304. For example, in the height direction, the liquid inlet pipe is arranged above the liquid outlet pipe, so that the coolant flowing in from the liquid inlet pipe will flow along the flow channel under its own weight. Gravity can help the coolant flow, reducing the energy required for pumping, and a lower-power liquid drive component can be used to save costs.

[0065] Different from the prior art, the embodiment of the present application provides a battery pack, including multiple modules 10 and a first liquid cooling assembly 30. The multiple modules 10 are arranged along the width direction thereof. In the height direction of the module 10, the module 10 has a pole end and a heat dissipation end arranged opposite to each other. The pole end is used for conducting electricity. The module 10 includes multiple single cells 101, and the multiple single cells 101 are arranged along the length direction of the module 10. The first liquid cooling assembly 30 is arranged between the modules 10 along the width direction of the module 10. Compared with the prior art, the first liquid cooling assembly 30 is mainly used to dissipate heat from the side of the battery module 10, improve the heat dissipation efficiency, reduce the risk of condensation, and enhance the heat dissipation capacity of the battery pack.

[0066] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0067] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0068] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A plurality of modules are arranged along the width direction thereof. In the height direction of the modules, the modules have a pole end and a heat dissipation end arranged opposite to each other, the pole end is used for conducting electricity, the modules include a plurality of single cells, and the plurality of single cells are arranged along the length direction of the modules; and The first liquid cooling component is arranged between the modules along the width direction of the modules.

2. The battery pack according to claim 1, characterized in that: The battery pack also includes a second liquid cooling component, which is arranged on a side of the multiple modules close to the heat dissipation end.

3. The battery pack according to claim 1, characterized in that: The battery pack further includes a vapor chamber, and the vapor chamber and the first liquid cooling assembly are alternately arranged between the modules.

4. The battery pack according to claim 3, characterized in that: The number of the first liquid cooling components between adjacent heat sinks is at least two.

5. The battery pack according to claim 3 or 4, characterized in that: The thickness of the heat spreader is D1, 1 mm≤D1≤4 mm.

6. The battery pack according to claim 3, characterized in that: The single cell battery includes a first side surface and a second side surface, the first side surface is arranged in the thickness direction of the single cell battery, the second side surface is arranged in the length direction of the single cell battery, the area of ​​the first side surface is larger than the second side surface, and the heat spreader and the first liquid cooling assembly are respectively connected to the second side surfaces arranged opposite to each other.

7. The battery pack according to claim 6, characterized in that: The battery pack further includes a first copper sheet, which is disposed between the single batteries and in contact with the first side surface.

8. The battery pack according to claim 7, characterized in that: The battery pack further includes a second copper sheet, which is disposed between the second side surface and the first liquid-cooling assembly, and the first liquid-cooling assembly is in contact with the single battery through the second copper sheet.

9. The battery pack according to claim 8, characterized in that: The first copper sheet and the second copper sheet are connected, and the first copper sheet and the second copper sheet are an integrally formed structure.

10. The battery pack according to claim 8, characterized in that: The thickness of the first copper sheet is D2, the thickness of the second copper sheet is D3, and 0.5 mm≤D3≤D2≤3 mm.

11. The battery pack according to claim 7, characterized in that: The opposite ends of the first copper sheet are in contact with the first liquid cooling assembly and the vapor chamber, respectively.

12. The battery pack according to claim 7, characterized in that: In the height direction of the module, the height of the first copper sheet is the same as the height of the first side surface; and / or in the width direction of the module, the width of the first copper sheet is the same as the width of the first side surface.

13. The battery pack according to any one of claims 1 to 12, characterized in that: The first liquid cooling component includes a first shell and a plurality of first baffles. The first shell is provided with a first liquid cooling cavity. The plurality of first baffles are arranged at intervals in the first liquid cooling cavity and connected to the first shell. The first baffles and the first shell form a first flow channel and a second flow channel for the circulation of cooling liquid. The first flow channel and the second flow channel are alternately arranged and connected end to end.

14. The battery pack according to any one of claims 2 to 12, characterized in that: The second liquid cooling assembly includes a second shell and a plurality of second baffles, the second shell is provided with a second liquid cooling cavity, the plurality of second baffles are arranged at intervals in the second liquid cooling cavity and connected to the second shell, the second baffles and the second shell form a third flow channel and a fourth flow channel for the circulation of cooling liquid, the third flow channel and the fourth flow channel are alternately arranged and connected end to end.

15. The battery pack according to claim 13, characterized in that: The first liquid cooling component includes a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are respectively connected to the first shell, the liquid inlet pipe is connected to the first flow channel located at the beginning, and the liquid outlet pipe is connected to the second flow channel located at the end, and the liquid inlet pipe and the liquid outlet pipe are relatively arranged in the height direction of the module and arranged at intervals.

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