A BMS thermal management system for lithium battery packs

Abstract

The present invention relates to the field of new energy vehicle batteries, and discloses a BMS thermal management system for a lithium battery pack, comprising a battery pack and a battery temperature control mechanism, wherein the battery pack comprises a battery box and a battery cell, and the battery temperature control mechanism comprises a heat exchanger, a water pump, a water tank and a heat pump, wherein a liquid inlet end of the water pump is provided with a liquid inlet pipe 1, a liquid inlet pipe 2 and a liquid inlet pipe 3 through a four-way pipe, and electromagnetic valves are provided at the three installation locations, and an input pipe connected to the battery box is provided at the liquid outlet end of the water pump, the liquid inlet pipe 1 is connected to the heat exchanger, the heat exchanger is connected to the battery box through an output pipe, the liquid inlet pipe 2 is connected to a heat exchange column in the water tank, the heat exchange column is connected to the output pipe through a branch pipe 1, the liquid inlet pipe 3 is connected to the heat pump, and the heat pump is connected to the output pipe through a branch pipe 2, the heat pump can receive low-level heat energy generated by the operation of the battery cell and convert it into high-level heat energy for heating a water medium, and the heat pump can be powered on to cool the water medium in the water tank.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle batteries, and in particular to a BMS thermal management system for a lithium battery pack. Background Art

[0002] BMS refers to the battery management system, which ensures the normal operation of the battery. Since battery charging and discharging will generate a lot of heat, and temperature is one of the important factors affecting the normal operation of the battery, it is necessary to strengthen the thermal management of the battery. The thermal management of the battery includes battery heat dissipation and cooling.

[0003] Based on battery heat dissipation and cooling, some existing technologies were found after searching:

[0004] First, the Chinese invention patent with authorization announcement number CN109687054B discloses a liquid-cooled battery heat dissipation system, which realizes liquid circulation through an external water pump, realizes the connection between the battery slot component and the battery unit shell through fins, and increases the contact area between the battery slot component and the coolant. Although it can achieve the purpose of rapid heat dissipation, it still has limitations in use. For example, during normal city driving, due to the short driving distance, relatively short driving time and low speed, the heat generated is not much, and normal heat dissipation can meet the use requirements. However, when driving on the highway, it is necessary to go to the service area to charge. Since the car will generate a lot of heat when driving at high speed, the battery temperature will be relatively high when the car reaches the service area. For higher, because the battery will also generate heat when charging, especially when the battery is about to be fully charged, the charging will generate more heat. In this way, the battery temperature is further increased after charging. Generally speaking, after the car is fully charged in the service area, the driver will continue on his way. Due to high-speed regulations, the car needs to increase and maintain the speed in a short time. Therefore, a large amount of heat will be generated. The above heat accumulates and it is very easy to cause the battery temperature to be too high, affecting the use of the battery. According to the principle of this prior art, it can be known that at this time, only by increasing the power of the water pump can the heat dissipation effect be increased, but the water pump uses the power of the car battery, which will undoubtedly reduce the car's cruising range and needs to be improved.

[0005] Secondly, the Chinese invention patent with application publication number CN109449540A discloses a battery heat dissipation assembly and a lithium battery, which achieves battery heat dissipation by driving air circulation through the cooperation of an intake fan and an exhaust fan. When applied to new energy vehicle batteries, the above-mentioned problems will also exist.

[0006] In summary, the present invention proposes a BMS thermal management system for a lithium battery pack. Summary of the invention

[0007] In order to solve the problems mentioned in the above background, the present invention provides a BMS thermal management system for a lithium battery pack.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0009] A BMS thermal management system for a lithium battery pack, comprising a battery pack and a battery temperature control mechanism, wherein the battery pack comprises a battery box containing an insulating coolant and a plurality of battery cells installed in the battery box, and the battery temperature control mechanism comprises a heat exchanger, a water pump, a water tank and a heat pump;

[0010] The liquid inlet end of the water pump is equipped with three liquid inlet pipes through a four-way pipe, namely liquid inlet pipe 1, liquid inlet pipe 2 and liquid inlet pipe 3. Solenoid valves are arranged between the three liquid inlet pipes and the four-way pipe. The liquid outlet end of the water pump is provided with an input pipe, which is connected to the battery box. Liquid inlet pipe 1 is connected to the heat exchanger. The heat exchanger and the battery box are connected through an output pipe.

[0011] Liquid inlet pipe two is connected to the heat exchange column in the water tank, the heat exchange column and the output pipe are connected through branch pipe one, liquid inlet pipe three is connected to the heat pump, the heat pump and the output pipe are connected through branch pipe two, the pipe group of the heat pump is spirally distributed in the water tank, the heat pump can receive the low-level heat energy generated by the operation of the battery cell and convert it into high-level heat energy for heating the water medium, and the heat pump can be powered on to cool the water medium in the water tank.

[0012] As a further improvement and optimization of the present invention, a plurality of installation areas are arranged in an array along the length direction of the battery box to form a column installation area. A plurality of column installation areas are arranged in an array along the width direction of the battery box, and a battery cell is installed in each installation area.

[0013] As a further improvement and optimization of the present invention, a heat dissipation zone is arranged between two adjacent column installation areas, a side partition and an input nozzle are arranged on one side of the battery box along the length direction, and a side main zone and an output nozzle are arranged on the other side, the side partition is connected with the heat dissipation zone, and several side partitions are arranged corresponding to the heat dissipation zones and the two adjacent side partitions are not connected with each other, the input nozzle is connected with the side partition, and several corresponding ones are arranged, the side main zone is connected with all the heat dissipation zones, the output nozzle is connected with the side main zone, the output nozzle is connected with the output pipe, the input pipe includes an input main pipe connected to the liquid outlet end of the water pump, a branch nozzle is arranged on the input main pipe, and the branch nozzle is connected with the input nozzle.

[0014] As a further improvement and optimization of the present invention, a sensor and an electric valve are provided at the connection between the branch nozzle and the input nozzle, and the flow area of ​​the electric valve for the coolant to flow is adjustable.

[0015] As a further improvement and optimization of the present invention, the axis of the heat exchange column coincides with the vertical center line of the water tank, and two side nozzles extend from the bottom of the heat exchange column, which are side nozzle 1 connected to liquid inlet pipe 2 and side nozzle 2 connected to branch pipe 1;

[0016] The water tank is provided with two insulation sleeves located on both sides of the heat exchange column and a driving component for driving the insulation sleeves to move closer to each other or rotate. When the two insulation sleeves made of insulation material contact each other, an insulation area accommodating the heat exchange column can be formed.

[0017] As a further improvement and optimization of the present invention, two core grooves are arranged in the heat exchange column, the bottoms of the two core grooves are respectively connected to the two side nozzles, the tops of the two core grooves are connected to each other, and a plurality of fins are distributed in an array on the outer surface of the heat exchange column.

[0018] As a further improvement and optimization of the present invention, the insulation sleeve is open to one side of the heat exchange column, and an avoidance groove is provided at the bottom of the insulation sleeve. When the two insulation sleeves contact each other, the two avoidance grooves form an avoidance hole for avoiding the bottom of the heat exchange column.

[0019] As a further improvement and optimization of the present invention, the driving component includes two worms, which are driven to rotate by two motors respectively, a base is rotatably mounted on the bottom of the thermal insulation sleeve, and a worm wheel is arranged outside the rotating shaft formed at the rotatable mounting position, and the worm wheel is meshed with the two worms;

[0020] The worm is divided into two thread segments with opposite thread rotation directions, and the two thread segments are respectively meshed with worm wheels on two heat insulation sleeves.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This solution includes normal heat dissipation mode, fast heat dissipation mode and heating mode. During normal driving, it is in normal heat dissipation mode to dissipate heat for the battery pack;

[0023] When driving on the highway in hot weather such as summer, the battery pack is insufficient and the car goes to the service area for charging. The car has just accumulated a lot of heat during high-speed driving and the charging process. Therefore, when charging, the battery pack is charged on one side, and the heat pump is powered on by the power of the charging pile on the other side, generating ice water with very low temperature in the water pump. After charging, when the car continues to drive at high speed, solenoid valves 1 and 3 are closed, and solenoid valve 2 is opened. The operation of the water pump will cause the insulating coolant to flow, and during the flow, the coolant will exchange heat with the ice water in the heat exchange column. Since the temperature of the ice water is low, it can absorb the heat accumulated in the battery in a short time, so that the battery temperature drops rapidly, and it will not affect the car's cruising range. After that, the ice water can continue to serve as a heat dissipation medium until the cold energy is released. During this period, the heat exchanger does not need to be operated, which can reduce the energy consumption of the heat exchanger and extend the cruising range.

[0024] When driving on the highway in low temperature weather such as winter, when the passengers on the car temporarily take a rest at a service area, the car is generally turned off. Due to the low outside temperature, the battery temperature is likely to drop during the rest time after the car is turned off, resulting in insufficient battery power output and slow acceleration of the car when the car continues on the road after the rest. Therefore, at the beginning of high-speed driving, solenoid valve one and solenoid valve two are closed, and solenoid valve three is opened. The heat generated by the battery cells can be converted into high-level thermal energy by the heat pump and stored in the water medium, making the temperature of the water medium relatively high. In this way, when the car continues on the road after taking a rest at the service area, the coolant can be heated by heat exchange with the water medium, so that the temperature of the car battery can be quickly heated up and the battery power can be output normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0026] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0027] Figure 3 is a schematic diagram of a battery pack;

[0028] Figure 4 is a cross-sectional view of a battery box;

[0029] Figure 5 is a schematic diagram of a water pump;

[0030] Figure 6 is a schematic diagram of a water tank;

[0031] Figure 7 This is the internal diagram of the water tank;

[0032] Figure 8It is a schematic diagram of the thermal insulation sleeve, the driving component and the heat exchange column;

[0033] Fig. 9 is a schematic diagram of the driving components;

[0034] Fig.10 A cross-sectional view of a heat exchange column.

[0035] The reference numerals in the accompanying drawings are:

[0036] 100, battery box; 101, installation area; 102, heat dissipation area; 103, side partition; 104, side main area; 105, input nozzle; 106, output nozzle; 107, sensor; 108, electric valve; 200, water pump; 201, liquid inlet pipe 1; 202, output pipe; 203, heat exchanger; 204, input pipe; 205, four-way pipe; 300, water tank; 301, liquid inlet pipe 2; 302, branch one; 303, heat exchange column; 3031, core groove; 3032, side nozzle one; 3033, side nozzle two; 3034, fin; 304, insulation sleeve; 3041, base; 305, drive component; 3051, worm gear; 3052, worm; 3053, motor; 400, heat pump; 401, liquid inlet pipe three; 402, branch two; 403, pipeline group. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0038] Embodiment 1

[0039] Reference Figure 1-Figure 10 , a BMS thermal management system for a lithium battery pack, comprising a battery pack and a battery temperature control mechanism, wherein:

[0040] The battery pack includes a battery box 100 and a plurality of battery cells installed in the battery box 100. The battery box 100 is provided with an insulating coolant as a heat-conducting medium.

[0041] The battery temperature control mechanism includes a heat exchanger 203 , a water pump 200 , a water tank 300 and a heat pump 400 .

[0042] The liquid inlet end of the water pump 200 is installed with three liquid inlet pipes through the four-way pipe 205: liquid inlet pipe 1 201, liquid inlet pipe 2 301 and liquid inlet pipe 3 401. Solenoid valves are arranged between the three liquid inlet pipes and the four-way pipe 205. For the convenience of description, they are respectively named: solenoid valve 1, solenoid valve 2 and solenoid valve 3. The liquid outlet end of the water pump 200 is provided with an input pipe 204.

[0043] The input pipe 204 is connected to the battery box 100, the liquid inlet pipe 201 is connected to the heat exchanger 203, and the heat exchanger 203 and the battery box 100 are connected through the output pipe 202; in normal use, the solenoid valve 1 is opened, the solenoid valve 2 and the solenoid valve 3 are closed, and the water pump 200 can operate through the cooperation of the liquid inlet pipe 201, the output pipe 202 and the input pipe 204 to pull the insulating coolant to circulate between the battery box 100 and the heat exchanger 203 to achieve heat dissipation of the battery cells, which corresponds to the heat dissipation during normal driving of the car. Normal driving refers to the relatively low speed of the car, which is common in cars driving at speed limits in cities. This normal use is named the normal heat dissipation mode.

[0044] A heat exchange column 303 is provided in the water tank 300 , the second liquid inlet pipe 301 is connected to the heat exchange column 303 , and the heat exchange column 303 and the output pipe 202 are connected via the first branch pipe 302 .

[0045] The liquid inlet pipe three 401 is connected to the heat pump 400, and the heat pump 400 is connected to the output pipe 202 through the branch pipe two 402. The pipe group 403 of the heat pump 400 is spirally distributed in the water tank 300. The heat pump 400 is achievable with existing technology. It can receive the low-level thermal energy generated by the operation of the battery cells and convert it into high-level thermal energy. The high-level thermal energy will heat the water medium in the water tank 300, and it can also be powered on to cool the water medium in the water tank 300 to obtain ice water with very low temperature. This is achievable with existing technology and will not be elaborated on. In addition, when the new energy vehicle is charging, the charging gun can charge the battery pack and also energize the heat pump 400. The ice water is obtained when the car is charging, which will not consume the power of the battery pack and will not affect the cruising range of the car.

[0046] When driving on the highway in hot weather such as summer, the battery pack is insufficient and the car goes to the service area for charging. The car has just accumulated a lot of heat during high-speed driving and charging. Therefore, when charging, the battery pack is charged while the power of the charging pile is used to energize the heat pump 400, and very low temperature ice water is generated in the water pump 200. After charging, when the car continues to drive at high speed, the solenoid valve 1 and the solenoid valve 3 are closed, and the solenoid valve 2 is opened. At this time, the operation of the water pump 200 will cause the insulating coolant to flow, and during the flow, the coolant will be in the heat exchange column 303 and the heat exchange column 303. The ice water undergoes heat exchange. Since the temperature of the ice water is relatively low, it can absorb the heat accumulated in the battery in a short period of time, causing the battery temperature to drop rapidly without affecting the vehicle's range. This mode is named the rapid heat dissipation mode. It should be noted that when the cold energy of the ice water is released but is insufficient to continue dissipating heat, it is switched to the normal heat dissipation mode. The significance of this is that after the ice water cools down the battery pack rapidly, it can continue to act as a heat dissipation medium until the cold energy is released. During this period, the heat exchanger 203 does not need to be operated, which can reduce the energy consumption of the heat exchanger 203 and extend the range.

[0047] When it is winter or other low temperature weather, when the car is driving on the highway, when the passengers take a rest at the service area temporarily, the car is generally turned off. Due to the low outside temperature, the battery temperature is likely to drop during the rest time after the car is turned off, resulting in insufficient battery power output when the car continues to travel after resting, and the car accelerates slowly. Therefore, in this case, when the car is running at high speed, solenoid valves 1 and 2 are closed, and solenoid valve 3 is opened. At this time, the heat generated by the battery monomer can be converted into high-level heat energy by the heat pump 400 and stored in the water medium, so that the temperature of the water medium is relatively high. In this way, when the car continues to travel after resting at the service area, the coolant can be heated by heat exchange of the water medium, so that the temperature of the car battery can be quickly heated and the battery power can be output normally. This mode is named heating and temperature rise mode. It should be noted that after using the heat pump 400 to store heat in the water medium to increase the temperature, if the car continues to travel at high speed, the battery temperature will rise. Therefore, it can be switched to the normal heat dissipation mode, and the water tank 300 is made of insulation material, which can play a role in heat preservation.

[0048] It should be noted that when the car battery pack is charging, the power supply to the heat pump 400 can be turned on or off by a switch provided on the charging gun or on the central control screen of the car.

[0049] Embodiment 2

[0050] The second embodiment improves the battery box 100 to enhance the heat dissipation effect in the normal heat dissipation mode.

[0051] Reference Figure 3-Figure 5 A plurality of installation areas 101 which are not interconnected are arranged in the battery box 100, and a battery cell is installed in each installation area 101. Furthermore, a plurality of installation areas 101 are arranged in an array along the length direction of the battery box 100 and are named column installation areas, and a plurality of column installation areas are arranged in an array along the width direction of the battery box 100, thereby forming a layout of the installation area 101.

[0052] A heat dissipation zone 102 is arranged between two adjacent column mounting areas, a side partition 103 and an input nozzle 105 are arranged on one side of the battery box 100 along the length direction, and a side main zone 104 and an output nozzle 106 are arranged on the other side, wherein the side partition 103 is connected with the heat dissipation zone 102, therefore, a number of side partitions 103 are arranged corresponding to the heat dissipation zones 102 and two adjacent side partitions 103 are not connected with each other, the input nozzle 105 is connected with the side partition 103, and a number of the input nozzles 105 are arranged corresponding to the number of the side partitions 103, the side main zone 104 is connected with all the heat dissipation zones 102, and the output nozzle 106 is connected with the side main zone 104.

[0053] The output nozzle 106 is connected to the output pipe 202 .

[0054] The input pipe 204 includes an input main pipe connected to the liquid outlet end of the water pump 200, and a branch nozzle is arranged on the input main pipe, and the branch nozzle is connected to the input nozzle 105. A number of branch nozzles are arranged corresponding to the number of input nozzles 105, and a sensor 107 and an electric valve 108 are arranged at the connection between the branch nozzle and the input nozzle 105, wherein the flow area of ​​the electric valve 108 for the flow of coolant is adjustable, which can be realized by the existing technology and will not be elaborated.

[0055] In the normal cooling mode, at the beginning, the flow areas of all the electric valves 108 are the same, and the flow of the coolant in each cooling zone 102 is the same;

[0056] Due to the existence of the heat dissipation area 102, the two side walls of the installation area 101 along the width direction are relatively thin. Since the installation area 101 needs to transfer the heat of the battery cell to the coolant, it is made of a heat-conducting material, such as copper. Therefore, the two side walls of the installation area 101 are equivalent to a thin elastic metal sheet. If the battery cell generates more heat during use, the air in the gap between the installation area 101 and the battery cell will expand thermally, causing the thin elastic metal sheet to deform, thereby narrowing the width of the corresponding heat dissipation area 102 and changing the pressure in the heat dissipation area 102. The sensor 107 can detect this situation and send a signal to the controller. The controller controls the operation of the corresponding electric valve 108 to increase its flow area and increase the power of the water pump 200. In this way, more coolant flows into the corresponding heat dissipation area 102, thereby enhancing the heat dissipation effect of the column installation area where one or several battery cells that generate more heat are located, and at the same time, the heat dissipation effect of the column installation area where the remaining battery cells are located is not affected.

[0057] Embodiment 3

[0058] If heat exchange is maintained between the water medium in the water tank 300 and the heat exchange column 303, heat exchange will be maintained between the water medium and the coolant through components such as the liquid inlet pipe 2 301. Therefore, in order to isolate the heat exchange between the water medium and the coolant when the water tank 300 does not participate in battery temperature control, embodiment 3 is proposed.

[0059] Reference Figure 6-Figure 10 The heat exchange column 303 is cylindrical in shape and its axis coincides with the vertical center line of the water tank 300. A plurality of fins 3034 are distributed in an array on the outer circular surface of the heat exchange column 303. Two side nozzles extend from the bottom of the heat exchange column 303, namely, side nozzle 1 3032 connected to liquid inlet pipe 2 301 and side nozzle 2 3033 connected to branch pipe 1 302.

[0060] Two core grooves 3031 are provided in the heat exchange column 303, the bottoms of the two core grooves 3031 are respectively connected to the two side nozzles, and the tops of the two core grooves 3031 are connected to each other. Therefore, when the coolant flows in the heat exchange column 303, heat exchange with the water medium can be achieved through the fins 3034.

[0061] The water tank 300 is further provided with two heat-insulating sleeves 304 respectively located on both sides of the heat exchange column 303 and a driving component 305 for driving the heat-insulating sleeves 304 to move toward each other or rotate.

[0062] The insulation sleeve 304 is semi-cylindrical in shape, open on one side toward the heat exchange column 303, and an avoidance groove is provided at the bottom. When the two insulation sleeves 304 move toward each other, a cylindrical insulation area can be formed. The upper and lower ends of the insulation area are closed, and the two avoidance grooves at the bottom can together form an avoidance hole for avoiding the bottom of the heat exchange column 303. Therefore, the insulation area can accommodate the heat exchange column 303.

[0063] The driving component 305 includes two worms 3052, and the two worms 3052 are driven to rotate by two motors 3053 respectively. The bottom of the heat insulation sleeve 304 is rotatably mounted with a base 3041, and a worm wheel 3051 is arranged outside the rotating shaft formed at the rotatable mounting position, and the worm wheel 3051 is meshed with the two worms 3052. It should be noted that in the prior art, the meshing relationship between the worm wheel 3051 and the worm 3052 is equivalent to a threaded connection. Therefore, when the two worms 3052 are driven to rotate by two motors 3053 respectively, if they are in different directions and at the same speed, then the worm wheel 3051 can only move and move with the heat insulation sleeve 304. If they are at the same speed and in the same direction, the worm gear 3051 can only rotate, and rotate with the rotating shaft and the insulation sleeve 304 to stir the water medium in the water tank 300. If they are at different speeds, the worm gear 3051 rotates and moves at the same time, and also stirs the water medium in the water tank 300. Based on this, when the water medium in the water tank 300 is cooled or heated, the insulation sleeve 304 stirs the water medium to make the cooling or heating of the water medium more balanced. After the cooling or heating is completed, if it is not used, two insulation sleeves 304 are provided to cooperate to isolate the heat exchange column 303 to prevent the cold energy or heat energy of the water medium from being lost too quickly.

[0064] It should be noted that the worm 3052 is divided into two thread segments with opposite thread rotation directions, which correspond to the two thermal insulation sleeves 304 respectively.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A BMS thermal management system for a lithium battery pack, comprising a battery pack and a battery temperature control mechanism, characterized in that: The battery pack comprises a battery box (100) containing insulating coolant and a plurality of battery cells installed in the battery box (100); the battery temperature control mechanism comprises a heat exchanger (203), a water pump (200), a water tank (300) and a heat pump (400); The liquid inlet end of the water pump (200) is provided with three liquid inlet pipes through a four-way pipe (205), and they are respectively liquid inlet pipe 1 (201), liquid inlet pipe 2 (301) and liquid inlet pipe 3 (401). Solenoid valves are provided between the three liquid inlet pipes and the four-way pipe (205). The liquid outlet end of the water pump (200) is provided with an input pipe (204), the input pipe (204) is connected to the battery box (100), the liquid inlet pipe 1 (201) is connected to the heat exchanger (203), and the heat exchanger (203) and the battery box (100) are connected via an output pipe (202); The second liquid inlet pipe (301) is connected to the heat exchange column (303) in the water tank (300), the heat exchange column (303) and the output pipe (202) are connected via the first branch pipe (302), the third liquid inlet pipe (401) is connected to the heat pump (400), the heat pump (400) and the output pipe (202) are connected via the second branch pipe (402), the pipe group (403) of the heat pump (400) is spirally distributed in the water tank (300), the heat pump (400) can receive the low-level heat energy generated by the operation of the battery cell and convert it into high-level heat energy for heating the water medium, and the heat pump (400) can be powered on to cool the water medium in the water tank (300).

2. A BMS thermal management system for a lithium battery pack according to claim 1, characterized in that: A plurality of installation areas (101) are arranged in an array along the length direction of the battery box (100) to form a column installation area. A plurality of column installation areas are arranged in an array along the width direction of the battery box (100), and a battery cell is installed in each installation area (101).

3. A BMS thermal management system for a lithium battery pack according to claim 2, characterized in that: A heat dissipation area (102) is arranged between two adjacent column installation areas. A side partition (103) and an input nozzle (105) are arranged on one side of the battery box (100) along the length direction, and a side main area (104) and an output nozzle (106) are arranged on the other side. The side partition (103) is connected to the heat dissipation area (102). A plurality of side partitions (103) are arranged corresponding to the heat dissipation areas (102), and two adjacent side partitions (103) are not connected to each other. The input nozzle (105) is connected to the side partition (103) and a plurality of corresponding input nozzles are arranged. The side main area (104) is connected to all heat dissipation areas (102). The output nozzle (106) is connected to the side main area (104). The output nozzle (106) is connected to the output pipe (202). The input pipe (204) includes an input main pipe connected to the liquid outlet of the water pump (200). A branch nozzle is arranged on the input main pipe, and the branch nozzle is connected to the input nozzle (105).

4. A BMS thermal management system for a lithium battery pack according to claim 3, characterized in that: A sensor (107) and an electric valve (108) are provided at the connection between the branch nozzle and the input nozzle (105); the flow area of ​​the electric valve (108) for the coolant to flow is adjustable.

5. The BMS thermal management system of a lithium battery pack according to claim 1, characterized in that: The axis of the heat exchange column (303) coincides with the vertical center line of the water tank (300), and two side nozzles extend from the bottom of the heat exchange column (303), which are respectively the side nozzle 1 (3032) connected to the second liquid inlet pipe (301) and the side nozzle 2 (3033) connected to the branch pipe 1 (302); Two heat-insulating sleeves (304) are arranged in the water tank (300) and are respectively located on both sides of the heat exchange column (303), and a driving component (305) for driving the heat-insulating sleeves (304) to move toward each other or rotate. When the two heat-insulating sleeves (304) made of heat-insulating material are in contact with each other, a heat-insulating area for accommodating the heat exchange column (303) can be formed.

6. A BMS thermal management system for a lithium battery pack according to claim 5, characterized in that: Two core grooves (3031) are arranged in the heat exchange column (303), the bottoms of the two core grooves (3031) are respectively connected to the two side nozzles, and the tops of the two core grooves (3031) are connected to each other. A plurality of fins (3034) are distributed in an array on the outer surface of the heat exchange column (303).

7. A BMS thermal management system for a lithium battery pack according to claim 5, characterized in that: The heat insulating sleeve (304) is open on one side facing the heat exchange column (303), and an avoidance groove is provided at the bottom of the heat insulating sleeve (304). When the two heat insulating sleeves (304) are in contact with each other, the two avoidance grooves form an avoidance hole for avoiding the bottom of the heat exchange column (303).

8. The BMS thermal management system of a lithium battery pack according to claim 5, characterized in that: The driving component (305) includes two worms (3052), and the two worms (3052) are respectively driven to rotate by two motors (3053). A base (3041) is rotatably mounted at the bottom of the heat insulation sleeve (304), and a worm wheel (3051) is arranged outside the rotating shaft formed at the rotatable mounting position, and the worm wheel (3051) is meshed with the two worms (3052). The worm (3052) is divided into two thread segments with opposite thread rotation directions, and the two thread segments are respectively meshed with the worm wheels (3051) on the two heat insulation sleeves (304).

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