A battery pack heat dissipation structure

Abstract

The present invention relates to the technical field of battery heat dissipation, and discloses a battery pack heat dissipation structure, including an outer box body and battery cells. An inner housing is arranged inside the outer box body. The inner housing is in a rectangular shape composed of two side plates one and two side plates two. The side plates one and two are both arranged vertically. An upper cover is arranged at the upper opening of the inner housing, and a lower bottom is arranged at the lower opening. The inside of the upper cover is hollow. A nozzle located outside the inner housing and an upper hole located inside the inner housing are arranged on the lower end surface of the upper cover. The upper end of the battery cell is coaxially located in the upper hole, and the positive electrode end of the battery cell passes through an upper avoidance hole arranged on the upper end surface of the upper cover. A gap is formed between the outer wall of the upper end of the battery cell and the hole wall of the upper hole. The hole wall of the upper hole is provided with an annular opening, and the annular opening is communicated with the inner cavity of the upper cover. A liquid medium as a heat conduction medium can flow into the upper cover and flow out through the annular opening and the gap to form a water film on the outer surface of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to the field of battery heat dissipation. Background Art

[0002] Batteries are common power supply components in life. With the continuous development of battery technology, the applications of batteries are becoming more and more extensive, such as new energy vehicles, household appliances, factory machinery, etc. However, as the power of the battery increases, a large amount of heat is inevitably generated during its charging and discharging process, and efficient heat dissipation treatment is required. The common existing heat dissipation methods are air-cooled heat dissipation and liquid-cooled heat dissipation.

[0003] Based on the search for battery heat dissipation, some prior arts were found and are introduced one by one as follows:

[0004] First, a Chinese utility model patent with the authorization announcement number CN218385385U discloses a battery heat dissipation and insulation device, which realizes the heat dissipation of the battery through the wind force of the first heat dissipation component and the coolant of the second heat dissipation component. However, it has some drawbacks: the heat is conducted to the coolant through the heat dissipation pipeline, and the intermediate heat conduction effect depends on the heat conduction performance of the heat dissipation pipeline, that is, the heat dissipation effect depends on the heat conduction performance of the heat dissipation pipeline, which needs to be improved.

[0005] Second, a Chinese utility model patent with the authorization announcement number CN220209084U discloses an immersion liquid-cooled battery pack. The battery box is filled with insulating coolant, and the side wall of the battery box is provided with an inlet and an outlet for the insulating coolant to enter and exit. Through the inlet and the outlet, the insulating coolant enters the heat exchanger and then returns to the battery box. The coolant is dissipated by the heat exchanger, so that the battery monomers in the battery pack are immersed in a low-temperature insulating coolant. However, it still has some deficiencies: the number of battery monomers in the automotive battery is very large and they are relatively densely distributed. When the coolant is dissipated by the heat exchanger, the battery monomers hinder the flow of the coolant, and it is difficult to make all parts of the coolant in the battery box participate in the heat dissipation of the heat exchanger synchronously. Therefore, the temperature distribution of the coolant in the battery box is uneven, which needs to be improved.

[0006] Based on the above, the present invention proposes a battery pack heat dissipation structure. Summary of the Invention

[0007] To solve the problems mentioned in the above background, the present invention provides a battery pack heat dissipation structure.

[0008] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows.

[0009] A battery pack heat dissipation structure includes an outer box body and a plurality of battery cells. An inner shell is arranged inside the outer box body, and the battery cells are installed in the inner shell. The inner shell is in a rectangular shape composed of two side plates one and two side plates two. The side plates one and two are both arranged vertically. An upper shell cover is arranged at the upper opening of the inner shell, and a lower shell bottom is arranged at the lower opening.

[0010] The inside of the upper shell cover is hollow. The lower end surface of the upper shell cover is provided with a nozzle located outside the inner shell and an upper hole located inside the inner shell. The upper end of the battery cell is coaxially located in the upper hole, and the positive electrode end arranged at the upper end of the battery cell passes through the upper avoidance hole arranged on the upper end surface of the upper shell cover. A sealing fit is formed between the positive electrode end and the upper avoidance hole. A gap is formed between the outer wall of the upper end of the battery cell and the hole wall of the upper hole. The hole wall of the upper hole is provided with an annular opening, and the annular opening is communicated with the inner cavity of the upper shell cover. The liquid medium as the heat conduction medium can flow into the upper shell cover and flow out through the annular opening and the gap to form a water film on the outer surface of the battery cell.

[0011] Further, the lower shell bottom includes a main body. The lower end of the main body is closed, the upper end is open and provided with a cover plate. The upper end surface of the cover plate is provided with a lower hole. The lower end of the battery cell is coaxially located in the lower hole, and the negative electrode end arranged at the lower end of the battery cell passes through the lower avoidance hole arranged on the lower closed end of the main body. A sealing fit is formed between the negative electrode end and the lower avoidance hole. The outer surface of the main body is provided with a connection hole one and a connection hole two, and the two are respectively located on both sides of the main body. A liquid extraction pipe is connected to the orifice of the connection hole one, and a liquid return pipe is connected to the orifice of the connection hole two.

[0012] Further, a water-absorbing body is arranged inside the main body. The water-absorbing body is provided with a sleeve hole, and the hole wall of the sleeve hole is attached to the outer wall of the lower end of the battery cell.

[0013] Further, a water pump and a liquid storage tank are arranged inside the outer box body. The liquid medium is stored in the liquid storage tank. A liquid inlet pipe is connected to the liquid outlet of the liquid storage tank, and a liquid outlet pipe one is connected to the liquid inlet of the liquid storage tank. The end of the nozzle is connected to a liquid outlet pipe two.

[0014] The liquid inlet pipe, the liquid extraction pipe and the liquid inlet end of the water pump are connected through a three-way valve one. The three-way valve one is used to realize the connection between the liquid inlet pipe and the liquid inlet end of the water pump or the connection between the liquid extraction pipe and the liquid inlet end of the water pump.

[0015] The liquid outlet pipe one, the liquid outlet pipe two and the liquid outlet end of the water pump are connected through a three-way valve two. The three-way valve two is used to realize the connection between the liquid outlet pipe one and the liquid outlet end of the water pump or the connection between the liquid outlet pipe two and the liquid outlet end of the water pump.

[0016] Further, a blowing component is arranged inside the outer box body. The blowing component is used to drive the air to flow unidirectionally in the inner shell.

[0017] Further, one side of the two side plates II facing each other is open, and the side facing away from each other is closed. Ventilation openings are provided on the side surfaces of the side plates II along the length direction;

[0018] The air blowing assembly includes a condensation unit. The condensation unit includes a condensation body with a hollow interior. The bottom of the condensation body is connected to the end of the liquid return pipe. The connection between the condensation body and the ventilation openings of the side plates II is achieved through connecting pipes. There are two corresponding connecting pipes. A blower is installed on the outer surface of the condensation body, and the output end of the blower extends into the condensation body;

[0019] A number of external fins are arrayed on the outer surface of the condensation body. The output end of the blower is coaxially connected to a rotating shaft, and the rotating shaft is connected to a fan located outside the condensation body. Ventilation holes are provided on the outer surface of the outer box body.

[0020] Further, there are two blowers. The two blowers are respectively close to the connection parts of the two connecting pipes and the condensation body. A number of internal fins are arrayed inside the condensation body between the output ends of the two blowers. When one blower operates, it will suck the air in the inner shell through the corresponding connecting pipe and the side plate II. When the other blower operates, it will send the air in the condensation body into the inner shell through the corresponding connecting pipe and the side plate II.

[0021] Further, a number of air guiding plates are arrayed along the length direction inside the side plate II. The air guiding plates include vertical plates perpendicular to the length direction of the side plate II. One end of the vertical plate facing the closed side of the side plate II is provided with an inclined plate inclined towards the ventilation opening. The distance between the end of the inclined plate and the closed side of the side plate II is L, and the difference in L between adjacent two air guiding plates is equal.

[0022] Further, a number of battery cells are arrayed along the length direction of the inner shell to form a battery row, and a number of groups of battery rows are arrayed along the width direction of the inner shell. The battery cells in adjacent two groups of battery rows are arranged in a staggered manner.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In this solution, a water film is formed on the outer surface of the battery cell. The water film is an insulating, volatile and non-flammable liquid medium. Therefore, the heat generated by the battery cell easily evaporates the liquid medium into a gas state. In this way, compared with the existing air-cooled heat dissipation or liquid-cooled heat dissipation, on the one hand, evaporation can quickly take away the heat of the battery cell, and the heat conduction effect and efficiency are further enhanced. On the other hand, the outer surface of the battery cell is wrapped by the water film, which can play an effect similar to soaking, further improving the heat conduction effect. The improvement of the heat conduction effect means the improvement of the heat dissipation effect;

[0025] Meanwhile, the gaseous medium is drawn away by the air-blowing component. On the one hand, the air-blowing component can draw air to uniformly blow towards each battery cell and come into contact with all battery cells. Therefore, it can approximately take away all the gaseous medium formed by evaporation. Compared with the immersion liquid cooling heat dissipation in the prior art, this method is equivalent to being able to make all the liquid medium serving as the heat conduction medium flow, solving the problem mentioned in the background technology that "the battery cells hinder the flow of the coolant, and it is difficult to make all parts of the coolant in the battery box participate in the heat dissipation of the heat exchanger synchronously. Therefore, the temperature distribution of the coolant in the battery box is uneven and the heat dissipation effect is not good". On the other hand, as is well known, if volatile media such as alcohol are applied to the skin and then blown, the evaporation of alcohol can be accelerated. Based on this point, by blowing air towards the battery cells, the evaporation of the liquid medium can be accelerated, thereby further improving the efficiency of the liquid medium taking away the heat of the battery cells and improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is an internal schematic diagram of the present invention;

[0028] Figure 3 is a partial exploded view of the present invention;

[0029] Figure 4 is a front view of the upper shell cover and the battery cell;

[0030] Figure 5 is Figure 4 an enlarged view of A in

[0031] Figure 6 is a schematic diagram of the air-blowing component and the second side plate;

[0032] Figure 7 is a schematic diagram of the battery cell and the lower shell bottom;

[0033] Figure 8 is a cross-sectional view of the battery cell and the lower shell bottom;

[0034] Figure 9 is a schematic diagram of the second side plate, the air-blowing component and the water pump;

[0035] Figure 10 is a cross-sectional view of the second side plate;

[0036] Figure 11 is a cross-sectional view of the condensation unit;

[0037] Figure 12 is a schematic diagram of the water pump;

[0038] Figure 13It is an exploded view of the first three-way valve and the second three-way valve.

[0039] The reference numerals in the drawings are as follows:

[0040] 100, outer box body; 101, inner shell body; 1011, first side plate; 1012, second side plate; 1013, air guide plate; 102, battery cell; 103, upper shell cover; 1031, upper hole; 1032, nozzle; 1033, ring opening; 104, liquid storage tank; 105, fan; 106, lower shell bottom; 1061, main body; 1062, cover plate; 1063, lower hole; 1064, water absorption body; 1065, first connection hole; 1066, second connection hole; 1067, liquid extraction pipe; 1068, liquid return pipe; 107, blower; 108, condensation unit; 1081, condensation body; 1082, inner groove; 1083, inner fin; 1084, outer fin; 109, water pump; 110, first liquid outlet pipe; 111, liquid inlet pipe; 112, second liquid outlet pipe; 113, first three-way valve; 114, second three-way valve. Specific embodiments

[0041] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in conjunction with the accompanying drawings and preferred embodiments, describe in detail the specific embodiments, structures, features and their effects of the present invention as follows.

[0042] Refer to Figures 1-13 , a battery pack heat dissipation structure, including an outer box body 100 and a plurality of battery cells 102. An inner shell body 101 is arranged inside the outer box body 100, and the battery cells 102 are installed in the inner shell body 101.

[0043] The inner shell body 101 is in a rectangular body shape composed of two first side plates 1011 and two second side plates 1012. The first side plates 1011 and the second side plates 1012 are both arranged vertically. An upper shell cover 103 is arranged at the upper opening of the inner shell body 101, and a lower shell bottom 106 is arranged at the lower opening. Among them:

[0044] Refer to Figure 4 And Figure 5 , the inside of the upper shell cover 103 is hollow. A nozzle 1032 located outside the inner shell body 101 and an upper hole 1031 located inside the inner shell body 101 are arranged on the lower end surface of the upper shell cover 103. The upper end of the battery cell 102 is coaxially located in the upper hole 1031, and the positive electrode end arranged at the upper end of the battery cell 102 passes through the upper avoidance hole arranged on the upper end surface of the upper shell cover 103. A sealing fit is formed between the positive electrode end and the upper avoidance hole. Existing sealing technologies can be adopted and will not be elaborated here. A gap is formed between the outer wall of the upper end of the battery cell 102 and the hole wall of the upper hole 1031. A ring opening 1033 is arranged on the hole wall of the upper hole 1031, and the ring opening 1033 is communicated with the inner cavity of the upper shell cover 103;

[0045] Reference Figure 7 With Figure 8 , the lower shell bottom 106 includes a main body 1061. The lower end of the main body 1061 is closed, the upper end is open and provided with a cover plate 1062. The upper end surface of the cover plate 1062 is provided with a lower hole 1063. The lower end of the battery cell 102 is coaxially located in the lower hole 1063, and the negative electrode end provided at the lower end of the battery cell 102 passes through the lower avoidance hole provided at the lower closed end of the main body 1061. The negative electrode end and the lower avoidance hole form a sealing fit. Existing sealing technologies can be adopted and will not be elaborated here. An absorbent body 1064 is provided in the main body 1061, which has water absorption performance, such as a sponge. A sleeve hole is provided on the absorbent body 1064, and the hole wall of the sleeve hole fits with the outer wall of the lower end of the battery cell 102. The outer surface of the main body 1061 is provided with a first connection hole 1065 and a second connection hole 1066, and the two are respectively located on both sides of the main body 1061, that is, they are far apart from each other. A liquid extraction tube 1067 is connected to the orifice of the first connection hole 1065, and a liquid return tube 1068 is connected to the orifice of the second connection hole 1066;

[0046] Reference Figure 9 With Figure 10 , one side of the two second side plates 1012 facing each other is open, and the side facing away from each other is closed. Ventilation openings are provided on the side surface of the second side plate 1012 along the length direction. Air can enter the inner housing 101 through one second side plate 1012 and then be discharged through the other second side plate 1012, forming a unidirectional flowing air current. Preferably, in order to make the air current flow into the inner housing 101 evenly and be evenly extracted, reference Figure 10 , a plurality of air guiding plates 1013 are arranged in an array along the length direction inside the second side plate 1012. The air guiding plate 1013 includes a vertical plate perpendicular to the length direction of the second side plate 1012. One end of the vertical plate facing the closed side of the second side plate 1012 is provided with an inclined plate inclined towards the ventilation opening. The distance between the end of the inclined plate and the closed side of the second side plate 1012 is L. The difference in L between adjacent two air guiding plates 1013 is equal. Therefore, the air flowing into the second side plate 1012 through the ventilation opening is evenly divided and guided by the inclined plate and then flows into the inner housing 101 through the area between adjacent two vertical plates, achieving the purpose of uniform inflow. At the same time, there is a suction force at the opening of the other second side plate 1012 to draw away the evenly flowing air. Therefore, the purpose of uniform inflow and uniform discharge of air can be achieved.

[0047] Preferred embodiment, reference Figure 6 With Figure 7, the distribution of multiple battery cells 102 within the inner housing 101 is as follows: a number of battery cells 102 are arranged in an array along the length direction of the inner housing 101 to form battery columns, and several groups of battery columns are arranged in an array along the width direction of the inner housing 101. The battery cells 102 in adjacent two groups of battery columns are arranged staggeredly. The significance lies in that in this way, the air flowing into the inner housing 101 will come into contact with all the battery cells 102 as much as possible.

[0048] Refer to Figure 9 , a water pump 109 and a blower assembly are also provided within the outer casing 100. Specifically:

[0049] Refer to Figure 3 And Figure 12 , a liquid storage tank 104 is installed within the outer casing 100. Preferably, for spatial layout, the liquid storage tank 104 can be arranged below the inner housing 101.

[0050] A liquid inlet pipe 111 is connected to the liquid outlet of the liquid storage tank 104, a first liquid outlet pipe 110 is connected to the liquid inlet of the liquid storage tank 104, and a second liquid outlet pipe 112 is connected to the end of the nozzle 1032.

[0051] The liquid inlet pipe 111, the liquid extraction pipe 1067, and the liquid inlet end of the water pump 109 are connected through a first three-way valve 113. The first three-way valve 113 is used to realize the connection between the liquid inlet pipe 111 and the liquid inlet end of the water pump 109 or the connection between the liquid extraction pipe 1067 and the liquid inlet end of the water pump 109.

[0052] The first liquid outlet pipe 110, the second liquid outlet pipe 112, and the liquid outlet end of the water pump 109 are connected through a second three-way valve 114. The second three-way valve 114 is used to realize the connection between the first liquid outlet pipe 110 and the liquid outlet end of the water pump 109 or the connection between the second liquid outlet pipe 112 and the liquid outlet end of the water pump 109.

[0053] Both the first three-way valve 113 and the second three-way valve 114 can be realized by existing three-way valve technologies and will not be elaborated here.

[0054] During heat dissipation, the first three-way valve 113 is used to connect the liquid inlet pipe 111 with the liquid inlet end of the water pump 109, and the second three-way valve 114 is used to connect the second liquid outlet pipe 112 with the liquid outlet end of the water pump 109. Then, the water pump 109 is started to extract the liquid medium in the liquid storage tank 104 through the liquid inlet pipe 111 and inject it into the upper shell cover 103 through the second liquid outlet pipe 112. The liquid medium finally flows downward through the annular opening 1033 and the gap. Since the gap is relatively small, when the liquid medium flows downward, a continuously flowing water film will be formed on the outer surface of the battery cell 102 from top to bottom. Also, since the liquid medium has the properties of being insulating, volatile, and non-flammable, such as carbon tetrachloride, the liquid medium can quickly take away the heat of the battery cell 102. Most of the liquid medium is evaporated into a gas state, and a small part flows downward and is absorbed by the water absorption body 1064.

[0055] Referring to Figure 2 、 Figure 9 and Figure 11 , the blast component includes a condensation unit 108. The condensation unit 108 includes a condensation body 1081 with a hollow interior. The interior area of the condensation body 1081 is named an inner tank 1082. The bottom of the condensation body 1081 is connected to the end of the liquid return pipe 1068.

[0056] The connection between the condensation body 1081 and the ventilation opening of the second side plate 1012 is achieved through connecting pipes. There are two corresponding connecting pipes. Two fans 107 are installed on the outer surface of the condensation body 1081. The output ends of the two fans 107 both extend into the condensation body 1081. The two fans 107 are respectively close to the connection points of the two connecting pipes and the condensation body 1081. A number of inner fins 1083 are arranged in an array inside the condensation body 1081 between the output ends of the two fans 107. When one of the fans 107 operates, it will suck the air in the inner housing 101 through the corresponding connecting pipe and the second side plate 1012. When the other fan 107 operates, it will send the air in the condensation body 1081 into the inner housing 101 through the corresponding connecting pipe and the second side plate 1012. In this way, after the liquid medium is evaporated into a gaseous state, it will flow along with the air and be drawn into the condensation body 1081. A number of outer fins 1084 are arranged in an array on the outer surface of the condensation body 1081. The output end of the fan 107 is coaxially connected to a rotating shaft, and the rotating shaft is connected to a fan 105 located outside the condensation body 1081. At the same time, ventilation holes are opened on the outer surface of the outer box 100. When the fan 107 operates, it drives the fan 105 to rotate together, thereby dissipating heat from the condensation body 1081 and liquefying the gaseous medium in the condensation body 1081 into a liquid state.

[0057] The working principle of the present invention:

[0058] During heat dissipation, the three-way valve 113 is used to connect the liquid inlet pipe 111 to the liquid inlet end of the water pump 109, and the three-way valve 114 is used to connect the second liquid outlet pipe 112 to the liquid outlet end of the water pump 109. Then, the water pump 109 is started to extract the liquid medium in the liquid storage tank 104 through the liquid inlet pipe 111 and inject it into the upper shell cover 103 through the second liquid outlet pipe 112. The liquid medium finally flows downward through the annular opening 1033 and the gap. Since the gap is relatively small, when the liquid medium flows downward, it will form a continuously flowing water film from top to bottom on the outer surface of the battery cell 102. Also, since the liquid medium has the properties of being insulating, volatile, and non-flammable, such as carbon tetrachloride, the liquid medium can quickly take away the heat of the battery cell 102. Most of the liquid medium is evaporated into a gaseous state, and a small part flows downward and is absorbed by the water absorption body 1064;

[0059] At the same time, the two fans 107 cooperate with each other to blow air to the outer surface of the battery cell 102, and at the same time draw the evaporated gaseous medium into the condenser 1081, where the gaseous medium is liquefied into liquid and temporarily stored in the condenser 1081;

[0060] After the preset time, the liquid medium in the liquid storage tank 104 is about to be used up. At this time, the temperature of the battery cell 102 is also controlled within a preset range. Therefore, the heat dissipation is suspended. The three-way valve 113 is used to connect the liquid extraction pipe 1067 with the liquid inlet end of the water pump 109, and the three-way valve 114 is used to connect the liquid outlet pipe 110 with the liquid outlet end of the water pump 109. At this time, the condenser 1081, the liquid return pipe 1068, and the lower shell bottom 106 are full of liquid medium, and the water absorption body 1064 is also full of liquid medium. After that, the water pump 109 is started to suck the liquid medium through the liquid extraction pipe 1067 and return it to the liquid storage tank 104 through the liquid outlet pipe 110;

[0061] Then, continue to repeat the heat dissipation.

[0062] From the above process, we can know that:

[0063] This solution forms a layer of water film on the outer surface of the battery cell. The water film is an insulating, volatile, non-flammable liquid medium. Therefore, the heat generated by the battery cell can easily evaporate the liquid medium into a gaseous state. Compared with the existing air cooling or liquid cooling, this method can quickly take away the heat of the battery cell through evaporation, and the thermal conductivity and efficiency are further enhanced. On the other hand, the outer surface of the battery cell is wrapped by the water film, which can play a similar effect to immersion, further improving the thermal conductivity. The improvement of the thermal conductivity means the improvement of the heat dissipation effect.

[0064] At the same time, the gaseous medium is pulled away by the blowing assembly. On the one hand, the blowing assembly can pull the air to blow evenly to each battery cell and contact with all the battery cells. Therefore, it can take away almost all the gaseous medium formed by evaporation. Compared with the immersion liquid cooling in the prior art, this method is equivalent to being able to pull all the liquid media as the heat transfer medium to flow, which solves the problem mentioned in the background technology that "the battery cells hinder the flow of coolant, and it is difficult to make the coolant in each part of the battery box simultaneously participate in the heat dissipation of the heat exchanger. Therefore, the temperature distribution of the coolant in the battery box is uneven, and the heat dissipation effect is not good". On the other hand, it is well known that applying volatile media such as alcohol on the skin and then blowing air can accelerate the volatilization of alcohol. Based on this point, blowing air to the battery cells can accelerate the volatilization of the liquid medium, thereby further improving the efficiency of the liquid medium in taking away the heat of the battery cells, thereby improving the heat dissipation effect.

[0065] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A battery pack heat dissipation structure, comprising an outer box (100) and a plurality of battery cells (102), characterized in that: An inner shell (101) is arranged inside the outer box (100), and a battery cell (102) is installed in the inner shell (101). The inner shell (101) is in the shape of a rectangle composed of two side panels (1011) and two side panels (1012). The side panels (1011) and the side panels (1012) are arranged vertically. An upper shell cover (103) is arranged at the upper opening of the inner shell (101), and a lower shell bottom (106) is arranged at the lower opening. The interior of the upper shell cover (103) is hollow, and the lower end surface of the upper shell cover (103) is provided with a nozzle (1032) located outside the inner shell (101) and an upper hole (1031) located inside the inner shell (101); the upper end of the battery cell (102) is coaxially located in the upper hole (1031), and the positive terminal arranged at the upper end of the battery cell (102) passes through the upper avoidance hole arranged on the upper end surface of the upper shell cover (103), and a positive terminal is arranged between the positive terminal and the upper avoidance hole. A sealing fit is formed, a gap is formed between the outer wall of the upper end of the battery cell (102) and the hole wall of the upper hole (1031), the hole wall of the upper hole (1031) is provided with a ring opening (1033), the ring opening (1033) is communicated with the inner cavity of the upper shell cover (103), and a liquid medium as a heat-conducting medium can flow into the upper shell cover (103) and flow out through the ring opening (1033) and the gap, thereby forming a water film on the outer surface of the battery cell (102); The lower shell bottom (106) comprises a main body (1061), the lower end of the main body (1061) is closed, the upper end is open and a cover plate (1062) is provided, the upper end surface of the cover plate (1062) is provided with a lower hole (1063), the lower end of the battery cell (102) is coaxially located in the lower hole (1063) and the negative terminal arranged at the lower end of the battery cell (102) passes through the lower avoidance hole arranged at the lower closed end of the main body (1061), the negative terminal and the lower avoidance hole form a sealing fit, the outer surface of the main body (1061) is provided with a connection hole 1 (1065) and a connection hole 2 (1066), and the two are respectively located on two sides of the main body (1061), the opening of the connection hole 1 (1065) is connected to a liquid extraction pipe (1067), and the opening of the connection hole 2 (1066) is connected to a liquid return pipe (1068); A water pump (109) and a liquid storage tank (104) are arranged in the outer box body (100), and a liquid medium is stored in the liquid storage tank (104). A liquid inlet pipe (111) is connected to the liquid outlet of the liquid storage tank (104), a liquid outlet pipe 1 (110) is connected to the liquid inlet, and a liquid outlet pipe 2 (112) is connected to the end of the nozzle (1032); The liquid inlet pipe (111), the liquid extraction pipe (1067) and the liquid inlet end of the water pump (109) are connected via a three-way valve (113). The three-way valve (113) is used to achieve communication between the liquid inlet pipe (111) and the liquid inlet end of the water pump (109) or communication between the liquid extraction pipe (1067) and the liquid inlet end of the water pump (109); The first liquid outlet pipe (110), the second liquid outlet pipe (112) and the liquid outlet end of the water pump (109) are connected via a second three-way valve (114), and the second three-way valve (114) is used to achieve communication between the first liquid outlet pipe (110) and the liquid outlet end of the water pump (109) or communication between the second liquid outlet pipe (112) and the liquid outlet end of the water pump (109); An air blowing assembly is arranged in the outer box body (100), and the air blowing assembly is used to draw air to flow in one direction in the inner shell body (101); The two side panels (1012) are open on the sides facing each other and closed on the sides facing each other. Ventilation holes are provided on the sides of the side panels (1012) along the length direction. The air blowing assembly comprises a condensing unit (108), the condensing unit (108) comprises an internally hollow condensing body (1081), the bottom of the condensing body (1081) is connected to the end of the liquid return pipe (1068), the condensing body (1081) is connected to the vent of the second side plate (1012) via a connecting pipe, two connecting pipes are provided correspondingly, a fan (107) is installed on the outer surface of the condensing body (1081), and the output end of the fan (107) extends into the condensing body (1081); The outer surface of the condenser (1081) is provided with a plurality of external fins (1084) in an array, the output end of the fan (107) is coaxially connected to a rotating shaft, the rotating shaft is connected to a fan (105) located outside the condenser (1081), and the outer surface of the outer box (100) is provided with ventilation holes.

2. A battery pack heat dissipation structure according to claim 1, characterized in that: A water absorbing body (1064) is arranged in the main body (1061), and a sleeve hole is opened on the water absorbing body (1064), and the hole wall of the sleeve hole is in contact with the outer wall of the lower end of the battery cell (102).

3. A battery pack heat dissipation structure according to claim 1, characterized in that: Two fans (107) are provided. The two fans (107) are respectively located near the connection points between the two connecting pipes and the condenser (1081). The internal array of the condenser (1081) is provided with a plurality of inner fins (1083) located between the output ends of the two fans (107). When one fan (107) is in operation, it sucks the air in the inner shell (101) through the corresponding connecting pipe and the second side plate (1012). When the other fan (107) is in operation, it sends the air in the condenser (1081) into the inner shell (101) through the corresponding connecting pipe and the second side plate (1012).

4. A battery pack heat dissipation structure according to claim 1, characterized in that: A plurality of air guide plates (1013) are arranged in an array along the length direction of the second side plate (1012), the air guide plates (1013) comprising vertical plates perpendicular to the length direction of the second side plate (1012), an inclined plate inclined toward the vent is arranged at one end of the vertical plate facing the closed side of the second side plate (1012), the distance between the end of the inclined plate and the closed side of the second side plate (1012) is L, and the difference in L between two adjacent air guide plates (1013) is equal.

5. The heat dissipation structure of a battery pack according to claim 1, characterized in that: A plurality of battery cells (102) are arranged in an array along the length direction of the inner shell (101) to form a battery column. A plurality of battery columns are arranged in an array along the width direction of the inner shell (101). The battery cells (102) in two adjacent battery columns are arranged in a staggered manner.

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