Square lithium battery composite heat dissipation structure based on heat pipe and liquid cooling

Abstract

The application discloses a square lithium battery composite heat dissipation structure based on a heat pipe and liquid cooling, which comprises a heat-conducting aluminum box, a liquid cooling plate and an L-shaped heat pipe. The heat-conducting aluminum box comprises a battery accommodating cavity and a heat pipe evaporation section accommodating cavity arranged at the back side of the battery accommodating cavity. The evaporation section of the L-shaped heat pipe is arranged in the heat pipe evaporation section accommodating cavity. The liquid cooling plate comprises an internal cooling liquid flow channel. The condensation section of the L-shaped heat pipe is closely and fixedly installed on the liquid cooling plate and is staggered arranged on the left and right sides of the heat-conducting aluminum box. The evaporation section and the condensation section of the L-shaped heat pipe are vertically and roundly connected at an adiabatic section. The composite heat dissipation structure can improve the temperature uniformity of each square lithium battery in a group, and the liquid cooling plate does not directly contact the square lithium battery, so that the harm of cooling liquid leakage to the battery can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of energy storage lithium batteries and relates to a heat dissipation structure of a square lithium battery module. BACKGROUND

[0002] With the proposal of the "carbon peak" and "carbon neutralization" targets, reducing carbon emissions and effectively delaying global warming have become a hot spot for technological innovation in various industries. In order to reduce carbon emissions in the field of energy storage, selecting lithium batteries as energy storage batteries has become a development trend in the energy storage industry. Due to the extremely large number of lithium batteries in the energy storage system, the high energy density of the batteries and the close arrangement, it is difficult to effectively dissipate the heat generated by the lithium batteries during charging and discharging, thereby causing the temperature of the lithium batteries to rise. The working performance of the lithium battery is closely related to its temperature, and excessive or uneven temperature can cause inconsistencies in the internal resistance and capacity between the batteries, and in severe cases, even thermal runaway can occur. Therefore, effective lithium battery heat dissipation technology is the key to safe and reliable operation of the energy storage system.

[0003] The energy storage lithium battery heat dissipation technology can be divided into air cooling, liquid cooling, phase change material cooling and heat pipe cooling according to the cooling medium. These heat dissipation technologies have their own inherent problems that cannot be overcome when applied alone, and leakage prevention and compactness are still bottlenecks that need to be broken through in the heat dissipation technology of energy storage lithium batteries. Therefore, it is the development trend of energy storage lithium battery thermal management to selectively combine air cooling, liquid cooling, phase change material cooling and heat pipe cooling to make up for the inherent defects of single heat dissipation technology. The L-shaped heat pipe used in Chinese patent CN112582703A is bent at 90 degrees at the connection between the evaporation section and the condensation section (the adiabatic section), wherein the evaporation section is directly or through the upper copper plate bonded to the side wall of the battery, and the condensation section is directly or through the lower copper plate bonded to the liquid cooling plate in contact with the bottom of the battery. Although the external heat pipe condensation section avoids liquid leakage of the liquid cooling plate, the compactness of the battery heat dissipation structure is insufficient, and the heat dissipation structure design mainly surrounds a single battery, which is difficult to apply in the battery pack heat dissipation structure.

[0004] In addition, although the liquid cooling plate has been widely used in battery pack heat dissipation, it usually needs to directly contact the battery (such as Chinese patent CN212810393U) or be inserted between the batteries (such as Chinese patent CN205159464U) to achieve the purpose of improving the temperature uniformity between the batteries, which cannot avoid the risk of damage to the battery caused by leakage of the cooling liquid, and the heat dissipation effect of the liquid cooling plate itself is also affected. SUMMARY

[0005] The purpose of the present application is to provide a square lithium battery composite heat dissipation structure based on heat pipes and liquid cooling.

[0006] To achieve the above purpose, the following technical solutions are adopted in the present application:

[0007] A battery pack composite heat dissipation structure based on heat pipe and liquid cooling, comprising a heat-conductive aluminum box, a heat pipe and a liquid cooling plate; the heat-conductive aluminum box comprises battery accommodating cavities and heat pipe evaporation section accommodating cavities arranged on the back side of the battery accommodating cavities, the evaporation section of the heat pipe is arranged in the heat pipe evaporation section accommodating cavities, the condensation section of the heat pipe is arranged on the liquid cooling plate, the liquid cooling plate is arranged outside the heat-conductive aluminum box and does not contact the heat-conductive aluminum box, and the liquid cooling plate is provided with a cooling liquid flow channel for the flow of cooling liquid.

[0008] Preferably, the heat pipe is selected from one of L-shaped heat pipe and flat plate heat pipe.

[0009] Preferably, each battery accommodating cavity of the heat-conductive aluminum box is arranged according to the row and column distribution mode of each lithium battery in the battery pack, and each heat pipe evaporation section accommodating cavity of the heat-conductive aluminum box corresponds to the position of one row or one column of battery accommodating cavities.

[0010] Preferably, the condensation sections of the heat pipes are arranged alternately on both sides of the heat-conductive aluminum box and respectively match the liquid cooling plates arranged on the corresponding sides of the heat-conductive aluminum box.

[0011] Preferably, the cooling liquid in the liquid cooling plates on both sides of the heat-conductive aluminum box flows in opposite directions.

[0012] Preferably, the liquid cooling plate is provided with heat pipe condensation section accommodating cavities arranged at intervals for inserting the condensation sections of the heat pipes, or the liquid cooling plate is provided with liquid cooling plate grooves arranged at intervals for clamping the condensation sections of the heat pipes.

[0013] Preferably, the cooling liquid flow channel comprises straight line-shaped pipes and curve-shaped pipes arranged alternately inside the liquid cooling plate. Adjacent curve-shaped pipes and the curve-shaped pipe next to the cooling liquid inlet or the cooling liquid outlet are respectively connected (i.e., integrated) through corresponding straight line-shaped pipes.

[0014] Preferably, the curve-shaped pipe is S-shaped or mouth-shaped (the cooling liquid flowing into the cooling liquid flow channel from the cooling liquid inlet alternately diverges and converges at the joint of the mouth-shaped and straight line-shaped pipes and then flows out from the cooling liquid outlet), and the corners of the curve-shaped pipe and the joints with the straight line-shaped pipe are all rounded with the same radius.

[0015] Preferably, in the cooling liquid flow channel, the straight line-shaped pipe is located at the middle position inside the liquid cooling plate, and the curve-shaped pipe is located inside the liquid cooling plate and corresponds to the position of the condensation section of the heat pipe arranged on the liquid cooling plate; the geometric dimensions of each curve-shaped pipe are consistent and are in axial symmetry (such as the pipe of mouth-shaped) or central symmetry (such as the pipe of S-shaped).

[0016] An energy storage lithium battery includes the above-mentioned composite heat dissipation structure based on heat pipe and liquid cooling; a lithium battery is disposed within the battery housing cavity of the composite heat dissipation structure.

[0017] Preferably, the battery housing cavity is located below the heat pipe evaporation section housing cavity, which is situated at the bottom of the thermally conductive aluminum box, while the lithium battery electrodes are exposed at the top of the thermally conductive aluminum box.

[0018] Preferably, the battery pack is a square lithium battery module.

[0019] The beneficial effects of this invention are reflected in:

[0020] The composite heat dissipation structure for battery packs (e.g., square lithium battery modules) proposed in this invention employs a thermally conductive aluminum box and heat pipes, combined with liquid cooling plates spaced apart on the outside of the thermally conductive aluminum box. Utilizing the passive cooling function and high thermal conductivity of the heat pipes, along with the high convective heat transfer coefficient of the coolant, rapid and timely heat dissipation of the batteries is achieved, thereby reducing the temperature of the batteries within the pack and improving battery temperature uniformity. Furthermore, this composite heat dissipation structure is simple and compact, leak-proof, and easy to install and disassemble.

[0021] Furthermore, in this invention, the coolant flow channel adopts a structure combining straight and curved pipes, which reduces the length of the coolant flow path and lowers the temperature difference between the coolant inlet and outlet. This makes the heat dissipation rate of the condensation section of each heat pipe (e.g., L-shaped heat pipe) more consistent, improving the temperature uniformity of the battery pack. In addition, the curved pipes are beneficial to improving the heat dissipation effect of the condensation section of the heat pipe, thereby enhancing the heat dissipation effect of the battery pack.

[0022] Furthermore, the U-shaped pipe used in this invention can improve the heat dissipation effect of the condensation section of the heat pipe (e.g., an L-shaped heat pipe), thereby improving the temperature uniformity of the battery pack. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the square lithium battery composite heat dissipation structure based on heat pipes and liquid cooling in Example 1.

[0024] Figure 2 This is a schematic diagram of the internal arrangement of square lithium batteries;

[0025] Figure 3 for Figure 1 The diagram shows the structure of the thermally conductive aluminum box.

[0026] Figure 4 for Figure 1 The diagram shows the structure and arrangement of the L-shaped heat pipe.

[0027] Figure 5 for Figure 1 The diagram shows the structure and arrangement of the liquid cooling plate.

[0028] Figure 6a for Figure 1 One of the schematic diagrams of the coolant flow channels inside the liquid cooling plate shown (cross-sectional view of the liquid cooling plate);

[0029] Figure 6b for Figure 1 The second schematic diagram of the coolant flow channel inside the liquid cooling plate (cross-section of the liquid cooling plate);

[0030] Figure 7 This is a schematic diagram of the liquid cooling plate structure and layout of the square lithium battery composite heat dissipation structure based on heat pipes and liquid cooling in Example 3.

[0031] Figure 8 for Figure 7 A three-dimensional view of the coolant flow channels inside the liquid cooling plate shown.

[0032] In the diagram: 1-Lithium battery, 2-Thermoconductive aluminum box, 21-Battery housing cavity, 22-Heat pipe evaporation section housing cavity, 3-Heat pipe, 31-Heat pipe evaporation section, 32-Heat pipe insulation section, 33-Heat pipe condensation section, 4-Liquid cooling plate, 41-Heat pipe condensation section housing cavity, 42-Liquid cooling plate groove, 5-Coolant flow channel, 51-Coolant inlet, 52-Coolant outlet, 53-Straight pipe, 54-Curved pipe. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0034] (I) A composite heat dissipation structure for square lithium batteries based on heat pipes and liquid cooling

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, the composite heat dissipation structure provided by the present invention is designed based on the principles of heat pipes and liquid cooling, and is integrated with a square lithium battery module as an energy storage unit. The energy storage unit specifically includes a square lithium battery 1, a thermally conductive aluminum box 2, an L-shaped heat pipe 3, and a liquid cooling plate 4. The liquid cooling plate 4 is arranged on the left and right sides of the thermally conductive aluminum box 2 and does not contact the thermally conductive aluminum box 2 or the multiple square lithium batteries 1 arranged in rows and columns. The coolant flows along the coolant flow channel 5 formed in the liquid cooling plate 4 and can continuously flow into and out of the energy storage unit. Each row of square lithium batteries 1 is coupled to the evaporation section of a corresponding L-shaped heat pipe 3 through the bottom of the thermally conductive aluminum box 2. The condensation sections of each L-shaped heat pipe 3 are arranged alternately on the left and right sides of the thermally conductive aluminum box 2 and are coupled to the coolant through the liquid cooling plate 4 on the corresponding side.

[0037] like Figure 3As shown, the thermally conductive aluminum box 2 contains two types of cavities: a battery cavity 21 for mounting square lithium batteries 1 and a heat pipe evaporation section cavity 22 for mounting L-shaped heat pipes 3. The battery cavities 21 are opened from the top surface of the thermally conductive aluminum box 2 downwards, and their number, arrangement, geometry, and size match those of each square lithium battery 1 in the group. Each battery cavity 21 has five faces, which are tightly fitted to the bottom surface and four sides of the square lithium battery 1 placed therein (the top of the battery cavity 21 is open, and the electrodes of the square lithium battery 1 are exposed on the top surface of the thermally conductive aluminum box 2). The heat pipe evaporation section receiving cavity 22 is formed along the width direction of the square lithium battery module at the bottom of the heat-conducting aluminum box 2, and its geometry, size, and number match the L-shaped heat pipe 3 (specifically, its evaporation section). Each heat pipe evaporation section receiving cavity 22 has four sides, which are tightly fitted to the four sides of the evaporation section of the L-shaped heat pipe 3 placed therein (i.e., the battery receiving cavity 21 and the heat pipe evaporation section receiving cavity 22 are not connected). Each heat pipe evaporation section receiving cavity 22 is located directly below each row of battery receiving cavities 21 (e.g., ...). Figure 3 As shown in the image, the three battery housing cavities 21 arranged in a row are directly opposite the corresponding heat pipe evaporation section housing cavity 22 at the bottom of the thermally conductive aluminum box 2.

[0038] like Figure 4 As shown, the L-shaped heat pipe 3 is a flat heat pipe, and the evaporation section (i.e., the heat pipe evaporation section 31) of each L-shaped heat pipe 3 is installed in the corresponding heat pipe evaporation section receiving cavity 22, and the L-shaped heat pipes 3 are arranged alternately in two opposite arrangement directions (e.g., Figure 4 As shown, half of the L-shaped heat pipes 3 have their condensing sections (heat pipe condensing sections 33) located on the left side of the thermally conductive aluminum box 2, while the other half have their condensing sections located on the right side. One arrangement of the L-shaped heat pipes 3's condensing sections is combined with one liquid-cooled plate 4 in the composite heat dissipation structure, while the other arrangement is combined with another corresponding liquid-cooled plate 4 (ensuring a certain isolation gap between the two liquid-cooled plates 4 and the thermally conductive aluminum box 2). For each L-shaped heat pipe 3, the heat pipe evaporation section 31 and the heat pipe condensing section 33 transition with a vertical rounded corner at the heat pipe insulation section 32 (utilizing the perpendicular relationship between the heat pipe evaporation section 31 and the heat pipe condensing section 33 makes the composite heat dissipation structure more compact).

[0039] like Figure 5As shown, the protruding parts on the outer side of the liquid cooling plate 4 are the heat pipe condensing section accommodating cavities 41 (the inner side of the two liquid cooling plates 4 is flat), and the heat pipe condensing section 33 can be inserted into the heat pipe condensing section accommodating cavities 41, so that the two liquid cooling plates 4 are respectively installed on the left and right sides of the heat-conducting aluminum box 2. The position of the heat pipe condensing section accommodating cavities 41 on each liquid cooling plate 4 corresponds to the heat pipe condensing section 33 to be combined with the liquid cooling plate 4, and the number, geometry, and size of the heat pipe condensing section accommodating cavities 41 match the heat pipe condensing section 33. The heat pipe condensing section accommodating cavities 41 have four surfaces and are tightly combined with the four sides of the heat pipe condensing section 33, that is, the liquid cooling plate 4 is arranged in the reserved space between the heat-conducting aluminum box 2 and the heat pipe condensing section 33. It not only does not contact the square lithium battery 1 to avoid the harm of liquid leakage to the battery, but also further improves the compactness of the composite heat dissipation structure.

[0040] As shown in Figure 6a or Figure 6b Each liquid cooling plate 4 has a cooling liquid flow channel 5, and the cooling liquid flow channel 5 includes multiple sections connected in series. Each section of the flow channel is composed of a straight line part (i.e., a straight line pipe 53) and a curved part (different shapes of curved pipes 54 can be used, for example Figure 6a In the curved part of the pipe, two U-shaped pipes are combined into a "mouth" shape with the opening opposite to each other, and the two U-shaped pipes are symmetrically arranged above and below the straight line pipe. Figure 6b In the curved part of the pipe, a single S-shaped pipe is divided into a wave crest and a wave trough by the position of the adjacent straight line pipe 53, and the two parts are connected by a round corner. The straight line part of each section of the flow channel is located in the liquid cooling plate 4 and is located at the middle of the height direction of the liquid cooling plate 4 (corresponding to the part of the liquid cooling plate 4 where the heat pipe condensing section accommodating cavities 41 are not arranged). The curved part of each section of the flow channel is also located in the liquid cooling plate 4 and is located at different positions in the height direction of the liquid cooling plate 4 (corresponding to the part of the liquid cooling plate 4 where the heat pipe condensing section accommodating cavities 41 are arranged). Thus, the heat dissipation efficiency of the heat pipe condensing section 33 can be increased.

[0041] Example 2

[0042] Different from example 1, in order to reduce the contact thermal resistance and further increase the heat transfer efficiency, the square lithium battery 1 and the battery accommodating cavity 21, the heat pipe evaporating section 31 and the heat pipe evaporating section accommodating cavity 22, and the heat pipe condensing section 33 and the heat pipe condensing section accommodating cavity 41 can be respectively coated with heat-conducting silicone, and the position of the coating is formed with an interference fit to increase the stability of the composite heat dissipation structure after installation.

[0043] Example 3

[0044] Different from example 1 (as shown in Figure 7 , Figure 8As shown in the figure, the outer side of each of the two liquid cooling plates 4 is provided with liquid cooling plate grooves 42 arranged at intervals, and the condenser section 33 of the heat pipe can be engagedly inserted into the liquid cooling plate grooves 42. The positions of the liquid cooling plate grooves 42 on each of the liquid cooling plates 4 correspond to the condenser sections 33 of the heat pipe to be combined with the liquid cooling plate 4, and the number, geometry and size of the liquid cooling plate grooves 42 are matched with the condenser sections 33 of the heat pipe. The liquid cooling plate grooves 42 have three surfaces and are closely fitted with the three side surfaces of the condenser section 33 of the heat pipe (the remaining one side surface is exposed to the outside of the liquid cooling plate 4). The linear portion of each section of the cooling liquid flow channel 5 (i.e. the linear channel 53 located in the liquid cooling plate 4 and in the middle of the height direction of the liquid cooling plate 4) corresponds to the portion of the liquid cooling plate 4 which is not provided with the liquid cooling plate grooves 42, and the curved portion of each section (located in the liquid cooling plate 4) corresponds to the portion of the liquid cooling plate 4 which is provided with the liquid cooling plate grooves 42 (the curved portion of each section adopts a single S-shaped channel and is divided into a wave crest and a wave trough with the positions of the adjacent linear channels 53 as boundaries).

[0045] In the above examples, the structure of the cooling liquid flow channel 5 with the linear portion and the curved portion combined can reduce the length of the cooling liquid flow path, thereby reducing the temperature difference between the cooling liquid inlet 51 and the cooling liquid outlet 52 (with the positions of the cooling liquid inlet 51 and the cooling liquid outlet 52 on the liquid cooling plate 4 determined by the direction of the cooling liquid flowing into and out of the liquid cooling plate 4), so that the heat dissipation rates of the condenser sections 33 of the heat pipe tend to be consistent, thereby ensuring that the heat dissipation rates of the surfaces (e.g. the side surfaces and the bottom surface) of the square lithium batteries 1 tend to be consistent, and ultimately the temperature uniformity of the batteries in the group can be improved and the temperature of the batteries in the group can be reduced based on the heat-conductive aluminum box 2 and the L-shaped heat pipe 3. Figure 8

[0046] (II) Example of heat dissipation effect

[0047] Comparative example (using liquid cooling plate, without heat-conductive aluminum box and L-shaped heat pipe): the selected battery capacity is 205 Ah, which is regarded as a uniform heat source, the heat generation rate is 1C charging heat generation rate, the liquid cooling plate is arranged at the bottom of the battery group and the cooling liquid flow channel is "S" shaped, the cross-sectional area of the cooling liquid flow channel is rectangular and the length-width ratio is 3:1 (length and width are 12 mm and 4 mm respectively), the battery heat is only taken away by the cooling liquid, the cooling liquid is 50% water-glycol, the environmental temperature, initial temperature and cooling liquid inlet temperature are all 25℃, and the cooling liquid inlet speed is 0.1 m / s. The results show that the maximum temperature of the battery group is 37.3℃ and the maximum temperature difference (the difference between the maximum temperature and the minimum temperature of the battery surface) is 10.7℃. ​

[0048] Example I of the composite heat dissipation structure of the present application: except that the heat dissipation structure model refers to Example 1 (so that the heat generated by the batteries in the group is transmitted to the evaporation section 31 of the heat pipe through the heat-conducting aluminum box 1, the high thermal conductivity of the heat pipe can quickly transfer the heat at its evaporation section to the condensation section 33 of the heat pipe, and finally through the cooling liquid in the liquid cooling plate 4), the cooling liquid flow direction in the liquid cooling plate on both sides is opposite, and all other settings remain the same as the control example.

[0049] The results show that the maximum temperature of the corresponding battery group with the "mouth" shaped flow channel is 36.6℃ (decreased by 0.7℃ compared with the control example), the maximum temperature difference is 4.2℃ (decreased by 6.5℃ compared with the control example), and the cooling liquid inlet and outlet pressure drop in each liquid cooling plate is 211Pa; the maximum temperature of the corresponding battery group with the "S" shaped flow channel is 36.4℃ (decreased by 0.9℃ compared with the control example), the maximum temperature difference is 4.6℃ (decreased by 6.1℃ compared with the control example), and the cooling liquid inlet and outlet pressure drop in each liquid cooling plate is 616Pa. The results show that the composite heat dissipation structure of the present application can greatly reduce the maximum temperature difference of the battery group, and the maximum temperature difference is less than 5℃; at the same time, compared with the "S" shaped pipeline of the curved part, the cooling liquid flow channel with the "mouth" shaped curved part increases the maximum temperature of the corresponding battery group by 0.2℃ (an increase of 0.55%), but the maximum temperature difference of the battery group decreases by 0.4℃ (an decrease of 8.69%), and the cooling liquid inlet and outlet pressure drop decreases by 405Pa (a decrease of 65.75%), that is, the decrease of the maximum temperature difference of the battery group and the cooling liquid inlet and outlet pressure drop is much greater than the increase of the maximum temperature of the battery group, so compared with the "S" shaped flow channel, the cooling performance of the composite heat dissipation structure with the "mouth" shaped flow channel in the liquid cooling plate is obviously better than that with the "S" shaped flow channel (although the "S" shaped pipeline of the curved part can more widely spread the different positions in the height direction of the liquid cooling plate 4).

[0050] Example II of the composite heat dissipation structure of the present application: except that the heat dissipation structure model refers to Example 3 (so that the heat generated by the batteries in the group is transmitted to the evaporation section 31 of the heat pipe through the heat-conducting aluminum box 1, the high thermal conductivity of the heat pipe can quickly transfer the heat at its evaporation section to the condensation section 33 of the heat pipe, and finally through the cooling liquid in the liquid cooling plate 4), the cooling liquid flow direction in the liquid cooling plate on both sides is opposite, and all other settings remain the same as the control example. The results show that the maximum temperature of the battery group, the maximum temperature difference of the battery group, and the cooling liquid pressure drop in each liquid cooling plate all have the same results as Example I. However, the liquid cooling plate in Example 3 has a groove structure, which requires more materials in the production of the liquid cooling plate compared to the liquid cooling plate in Example 1.

Claims

1. A battery pack composite heat dissipation structure based on heat pipe and liquid cooling, characterized in that: The composite heat dissipation structure is composed of a heat-conducting aluminum box (2), a heat pipe (3) and a liquid cooling plate (4); the heat-conducting aluminum box (2) comprises a battery accommodating cavity (21) and a heat pipe evaporation section accommodating cavity (22) arranged at the back side of the battery accommodating cavity (21), the evaporation section of the heat pipe (3) is arranged in the heat pipe evaporation section accommodating cavity (22), the condensation section of the heat pipe (3) is arranged on the liquid cooling plate (4), the liquid cooling plate (4) is arranged outside the heat-conducting aluminum box (2) and does not contact the heat-conducting aluminum box, and a cooling liquid flow channel (5) for the flow of cooling liquid is arranged in the liquid cooling plate (4); The heat pipe (3) is an L-shaped heat pipe; The cooling liquid flow channel (5) comprises straight-line-shaped channels (53) and curve-shaped channels (54) arranged alternately; the curve-shaped channel (54) is a mouth-shaped channel, which is composed of two U-shaped channels in an open opposite manner; The straight-line-shaped channel (53) is located at the middle position of the liquid cooling plate (4), and the curve-shaped channel (54) corresponds to the position of the condensation section of the heat pipe (3) arranged on the liquid cooling plate (4); The battery accommodating cavities (21) of the heat-conducting aluminum box (2) are arranged in the row and column distribution mode of the lithium batteries (1), and each heat pipe evaporation section accommodating cavity (22) of the heat-conducting aluminum box (2) corresponds to the position of one row or one column of the battery accommodating cavities (21); The condensation sections of the heat pipes (3) are arranged alternately on both sides of the heat-conducting aluminum box (2) and are respectively attached to the liquid cooling plates (4) arranged on the corresponding sides of the heat-conducting aluminum box (2); The flow directions of the cooling liquid in the liquid cooling plates (4) on both sides of the heat-conducting aluminum box (2) are opposite; The lithium batteries (1) are square lithium batteries.

2. The battery pack composite heat dissipation structure based on heat pipe and liquid cooling according to claim 1, characterized in that: The liquid cooling plate (4) is provided with heat pipe condensation section accommodating cavities (41) for inserting the condensation sections of the heat pipes (3) arranged at intervals, or the liquid cooling plate (4) is provided with liquid cooling plate grooves (42) for clamping the condensation sections of the heat pipes (3) arranged at intervals.

3. An energy storage lithium battery, characterized by: The composite heat dissipation structure based on the heat pipe and the liquid cooling of the battery pack comprises the heat pipe and the liquid cooling structure according to any one of claims 1-2, and the battery accommodating cavities (21) of the composite heat dissipation structure are provided with the lithium batteries (1).

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