A long endurance battery module for low speed vehicles

Abstract

The application discloses a long-endurance battery module for a low-speed vehicle and relates to the technical field of battery modules.The battery module comprises a liquid cooling mechanism, and the liquid cooling mechanism comprises a square liquid cooling frame, and a liquid cooling block is arranged in the square liquid cooling frame.The battery units in adjacent installation positions are inverted to improve the overall cooling efficiency, and the inverted installation mode can reduce the risk of local overheating of the battery units due to uneven cooling, thereby prolonging the service life of the battery.The cooling mechanism can quickly and uniformly cool the cooling liquid in the contact surface of the two battery units, so that the temperature runaway phenomenon can be coped with.The air inlet mechanism can focus on cooling the battery units in a single region or multiple regions according to the use requirements.The expansion detection mechanism can detect whether the battery units are expanded, so that the safety performance of the battery module can be ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery modules, in particular to a long-battery module for a low-speed vehicle. BACKGROUND

[0002] Low-speed vehicles generally refer to electric vehicles designed for short-distance travel, and the maximum speed of such vehicles is generally between 20 and 45 kilometers per hour, which is suitable for urban commuting, campuses, tourist attractions and short-distance transportation. A battery module is usually a structural unit composed of multiple battery units, and the long-battery life of the battery is related to its charge and discharge cycle life. In a suitable temperature range, the life and performance of the battery are best, while extreme temperatures can accelerate the degradation of the battery and reduce the effective capacity, thereby affecting the battery life. At the same time, there may also be safety hazards under the influence of extreme temperatures.

[0003] The battery module and the battery comprising the same disclosed in patent publication No. CN115191054A include a plurality of battery cells stacked with each other; a module frame for accommodating the battery cell stack; an end plate covering the front and rear surfaces of the battery cell stack and coupled to the module frame; a heat sink located below the bottom of the module frame; and at least two cooling ports connected to the heat sink to supply refrigerant to the heat sink. The end plate includes: a first mounting portion located between the side end portion of the end plate and the cooling port adjacent to the side end portion of the at least two cooling ports, and extending in the protruding direction of the electrode lead protruding from the battery cell; and a second mounting portion located between two adjacent cooling ports of the at least two cooling ports, and extending in the protruding direction of the electrode lead protruding from the battery cell.

[0004] The above-mentioned battery module solves the problem of heat dissipation by adding a heat sink, but the heat dissipation effect of the heat sink is not ideal, and it cannot uniformly and comprehensively dissipate heat from the battery units. At the same time, it is not convenient to quickly resolve or reduce the harm caused by the risk of thermal runaway of the battery units in the battery module, and in the prior art, liquid cooling fins are usually attached to both ends of the battery units to dissipate heat from the battery units. Due to the difference in temperature generated at the top and bottom of the battery units during operation, this heat dissipation method has the disadvantage of uneven heat dissipation of individual battery units, which is not conducive to uniform heat dissipation of the battery units. At the same time, it is not convenient to adjust the temperature of a certain area according to the demand, and thus the present application is proposed. SUMMARY

[0005] The purpose of the present application is to provide a long-battery module for a low-speed vehicle to solve the problems raised in the background.

[0006] To achieve the above object, the application provides the following technical scheme: a long-endurance battery module for a low-speed vehicle, comprising a liquid cooling mechanism, the liquid cooling mechanism comprising a square liquid cooling frame, the inside of the square liquid cooling frame being provided with a liquid cooling block, a plurality of mounting positions and air cooling grooves being formed in the liquid cooling block, a spacing channel being formed between transversely adjacent mounting positions, the air cooling grooves being located between vertically adjacent spacing channels, the liquid cooling block being a hollow structure, connecting pipes being mounted at the top and bottom between the square liquid cooling frame and the liquid cooling block, liquid pumps being mounted on the connecting pipes, the square liquid cooling frame and the liquid cooling block forming a liquid circulation loop through the connecting pipes and the liquid pumps, battery units being mounted in the mounting positions, the battery units in adjacent mounting positions being inverted relative to each other, an air inlet mechanism being provided at the bottom of the liquid cooling mechanism for blowing air to the spacing channels and the air cooling grooves on the liquid cooling block, a plurality of through grooves being formed in the outer walls at both ends of the liquid cooling block and penetrating through the transversely adjacent air cooling grooves, air outlet grooves corresponding to the through grooves being formed in the outer walls at both ends of the square liquid cooling frame, a cooling mechanism being mounted in the through grooves for rapidly cooling the cooling liquid in the contact surfaces of the vertically adjacent battery units, and an expansion detection mechanism being mounted in the spacing channels for detecting whether the battery units have expanded and deformed.

[0007] Further, the expansion detection mechanism comprises a fixing frame mounted in the spacing channel, the ends of the fixing frame being attached to the outer walls of the transversely adjacent battery units, fixing columns being mounted on the inner walls at both sides of the fixing frame, a horizontal column being mounted between the fixing columns, second contacts being mounted on the outer walls at both ends of the horizontal column, first contacts being embedded and mounted on the inner walls of the fixing frame corresponding to the second contacts, and an electrical signal being sent according to whether the first contacts and the second contacts are in contact to determine whether the battery units have expanded and deformed.

[0008] Further, the cooling mechanism comprises a cooling pipe mounted in the through groove and a cylinder mounted at the exhaust pipe opening of the cooling pipe, an air suction pump being mounted at the air inlet opening of the cooling pipe, the air inlet opening of the cooling pipe being located in the air cooling groove, the exhaust pipe opening of the cooling pipe facing the outside of the liquid cooling block, a limiting ring and a movable limiting seat being mounted on the inner wall of the cooling pipe close to the air inlet opening, a plurality of movable cooling beads being placed in the inside of the cooling pipe between the limiting ring and the limiting seat, a spring being fixedly connected to the outer wall of the limiting seat, the other end of the spring being fixedly connected to a mounting plate mounted in the air outlet groove, and placing grooves for limiting ventilation being mounted on the inner wall top and bottom of the cylinder.

[0009] Further, the outer wall of the cooling bead is made of high-thermal-conductivity metal, the inside of the cooling bead is filled with phase-change material, a circular ring is rotationally connected to the middle of the outer wall of the cooling pipe in the air cooling groove, and a plurality of fan blades are mounted on the outer wall of the circular ring.

[0010] Further, the top and bottom of the battery unit are respectively provided with an upper connecting plate and a lower connecting plate, the connection of the battery unit is completed through the cooperation of the upper connecting plate and the lower connecting plate, the four corners of the inner wall of the square liquid cooling frame are provided with support frames, the top and bottom of the support frame are respectively provided with a top plate and a bottom plate, the top plate is provided with a connecting end electrically connected with the upper connecting plate and the lower connecting plate, and the bottom of the outer wall of the bottom plate is provided with a vertical groove corresponding to the air cooling groove and the spacing channel and penetrating the upper connecting plate, the lower connecting plate, the bottom plate and the top plate.

[0011] Further, the air inlet mechanism includes an air inlet box mounted on the bottom of the outer wall of the bottom plate, a plurality of partitions are mounted in the air inlet box, the air cooling groove and the spacing channel are divided into a plurality of areas through the plurality of partitions, the outer walls of the two ends of the air inlet box are provided with ventilation pipes corresponding to the areas, the outer walls of the ventilation pipes are provided with valves, and the air inlet box is provided with a gas collecting pipe connected with the ventilation pipes.

[0012] Further, a plurality of heat dissipation fins are mounted on the outer wall of the square liquid cooling frame, the heat dissipation fins are "T" shaped, and the "H" shaped structure is formed through the plurality of "T" shaped heat dissipation fins and the square liquid cooling frame, so that the anti-collision and anti-extrusion capacity of the square liquid cooling frame is improved.

[0013] Further, an aluminum alloy ring is mounted on the outer wall of the battery unit, positioning grooves are formed in the four boundaries of the top outer wall of the top plate, and positioning columns matched with the positioning grooves are mounted on the four boundaries of the bottom outer wall of the bottom plate.

[0014] Compared with the prior art, the beneficial effects of the present application are:

[0015] The long-lasting battery module for low-speed vehicles can improve the overall cooling efficiency by inverting the battery units in adjacent installation positions, and the inverted installation mode can reduce the risk of local overheating of the battery units due to uneven cooling, thereby prolonging the service life of the battery. The cooling mechanism can quickly and uniformly cool the cooling liquid in the same liquid cooling block contact surface of the two battery units, which is beneficial to improve the heat dissipation efficiency and facilitate the control of temperature runaway. The air inlet mechanism can focus on cooling the battery units in a single area or multiple areas according to the use requirements, which is beneficial to improve the heat dissipation efficiency. The expansion detection mechanism can detect whether the battery unit has expanded, which is beneficial to ensure the safety performance of the battery module.

[0016] Meanwhile, electric heating wires can be added in the square liquid cooling frame and the air inlet mechanism, so that the square liquid cooling frame adjusts the temperature of the cooling liquid and the air inlet mechanism adjusts the temperature of the blown air, thereby controlling the temperature of the battery unit, the cooling beads in the cooling mechanism absorb heat, the high-thermal-conductivity metal is used as the shell, and the phase change material is filled in the inside, so that the heat conduction effect can be improved, the circular ring cooperates with the fan blade, so that the fan blade can rotate under the influence of the airflow when the air inlet mechanism starts, and then the contact area of the airflow and the inner wall of the part of the air cooling groove is increased, so that the contact area is increased and the heat exchange efficiency is improved.

[0017] Meanwhile, the contact area of the cooling liquid and the outside can be increased by the plurality of heat dissipation fins, the heat exchange efficiency is improved, the heat dissipation of the cooling liquid in the square liquid cooling frame is accelerated, and the H-shaped structure is formed with the square liquid cooling frame by the T-shaped design, so that the anti-collision and anti-extrusion capabilities of the square liquid cooling frame are improved, the battery unit is protected, the aluminum alloy ring can help the rapid conduction of the heat of the battery unit, and the surface-treated aluminum alloy ring can increase the corrosion resistance of the battery unit. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the application;

[0019] Figure 2 It is a schematic diagram of the top structure of the upper connecting plate of the application;

[0020] Figure 3 It is a schematic diagram of the bottom structure of the lower connecting plate of the application;

[0021] Figure 4 It is a schematic diagram of the liquid cooling mechanism structure of the application;

[0022] Figure 5 It is a schematic diagram of the liquid cooling block structure of the application;

[0023] Figure 6 It is a schematic diagram of the through groove structure of the application;

[0024] Figure 7 It is a schematic diagram of the air inlet mechanism structure of the application;

[0025] Figure 8 It is a schematic diagram of the expansion detection mechanism cross-section structure of the application;

[0026] Figure 9 It is a schematic diagram of the enlarged structure at A of the application;

[0027] Figure 10 It is a schematic diagram of the cooling mechanism cross-section structure of the application;

[0028] Figure 11 It is a schematic diagram of the aluminum alloy ring structure of the application.

[0029] Fig. 1: liquid cooling mechanism; 101: square liquid cooling frame; 102: heat dissipation fin; 103: liquid cooling block; 104: mounting position; 105: air cooling groove; 106: liquid pump; 107: connecting pipe; 108: through groove; 109: air exhaust groove; 2: upper connecting plate; 3: top plate; 4: connecting end; 5: battery unit; 6: expansion detection mechanism; 601: fixed frame; 602: fixed column; 603: cross column; 604: first contact; 605: second contact; 7: cooling mechanism; 701: cooling pipe; 702: air suction pump; 703: limiting ring; 704: cooling bead; 705: limiting seat; 706: spring; 707: circular ring; 708: fan blade; 709: cylinder; 710: placing groove block; 711: mounting plate; 8: air inlet mechanism; 801: air inlet box; 802: ventilation pipe; 803: valve; 804: air collecting pipe; 805: partition; 9: support frame; 10: bottom plate; 11: lower connecting plate; 12: positioning groove; 13: vertical groove; 14: positioning column; 15: aluminum alloy ring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] The long endurance of a battery is closely related to its working temperature. A suitable working temperature can improve the endurance, while an extreme temperature can have a negative impact on the performance of the battery. Therefore, maintaining the battery in an ideal temperature range is the key to ensuring its efficient operation and prolonging its service life. When the battery module is in use, the air collecting pipe needs to be connected to the fan to facilitate the normal operation of air cooling, and the battery management system needs to be added to monitor the temperature of the battery unit, so as to facilitate the normal operation of the battery module.

[0032] As Figures 1-11The application provides a technical scheme: a long-endurance battery module for a low-speed vehicle, which comprises a liquid cooling mechanism 1, the liquid cooling mechanism 1 comprises a square liquid cooling frame 101, the inside of the square liquid cooling frame 101 is provided with a liquid cooling block 103, a plurality of mounting positions 104 and air cooling grooves 105 are formed in the liquid cooling block 103, a spacing channel is formed between transversely adjacent mounting positions 104, the air cooling grooves 105 are located between vertically adjacent spacing channels, the liquid cooling block 103 is a hollow structure, connecting pipes 107 are installed at the top and the bottom between the square liquid cooling frame 101 and the liquid cooling block 103, liquid pumps 106 are installed on the connecting pipes 107, the square liquid cooling frame 101 and the liquid cooling block 103 form a liquid circulation loop through the connecting pipes 107 and the liquid pumps 106, battery units 5 are installed in the mounting positions 104, the battery units 5 in adjacent mounting positions 104 are inverted, the bottom of the liquid cooling mechanism 1 is provided with an air inlet mechanism 8 for blowing air on the spacing channels and the air cooling grooves 105 on the liquid cooling block 103, a plurality of through grooves 108 are formed in the outer walls of the two ends of the liquid cooling block 103 and penetrate the air cooling grooves 105, air outlet grooves 109 corresponding to the through grooves 108 are formed in the outer walls of the two ends of the square liquid cooling frame 101, a cooling mechanism 7 for rapidly cooling the cooling liquid in the contact surface of the vertically adjacent battery units 5 is installed in the through grooves 108, and an expansion detection mechanism 6 for detecting whether the battery units 5 are expanded and deformed is installed in the spacing channels.

[0033] It should be noted that the battery cells 5 are separated by the set interval, which avoids the risk of short circuit caused by the mutual contact of the battery cells 5, and is beneficial to improve the stability of the battery module. The mounting position 104 is used to place and install the battery cell 5, and the battery cell 5 can be cooled by the cooling liquid flowing in the liquid cooling block 103. The square liquid cooling frame 101 can facilitate the cooling of the cooling liquid in the liquid circuit, and the square liquid cooling frame 101 surrounds the liquid cooling block 103, which is beneficial to protect the battery cell 5. By starting the liquid pump 106 on the connecting pipe 107, the cooling liquid in the liquid cooling block 103 can be pumped into the square liquid cooling frame 101, and the cooling liquid in the square liquid cooling frame 101 can be pumped into the liquid cooling block 103. The battery cells 5 in the adjacent mounting positions 104 are inverted, and the inverted installation can better realize the uniform contact of the cooling liquid with the battery cells 5 through the inner wall of the liquid cooling block 103, avoid the uneven cooling caused by the arrangement of the cells, improve the overall cooling efficiency, and reduce the risk of local overheating of the battery cells 5 due to uneven cooling, thereby prolonging the service life of the battery. The air inlet mechanism 8 is provided to blow air to the interval and the air cooling groove 105, which is beneficial to improve the heat dissipation efficiency. At the same time, when adjusting the temperature, electric heating wires can be added in the square liquid cooling frame 101 and the air inlet mechanism 8 to adjust the temperature of the cooling liquid in the square liquid cooling frame 101 and the air blown by the air inlet mechanism 8, so as to control the temperature of the battery cells 5. The cooling mechanism 7 is provided to quickly and uniformly cool the cooling liquid in the contact surface of the vertically adjacent battery cells 5, which is beneficial to improve the heat dissipation efficiency and facilitate the response to the thermal runaway phenomenon caused by temperature out of control. The expansion detection mechanism 6 is provided to detect whether the battery cell 5 expands, which is beneficial to ensure the safety performance of the battery module.

[0034] As shown in Figure 8 and Figure 9 The expansion detection mechanism 6 includes a fixed frame 601 installed in the interval, the two ends of the fixed frame 601 are attached to the outer walls of the horizontally adjacent battery cells 5, the inner walls of the two sides of the fixed frame 601 are both installed with fixed columns 602, the fixed columns 602 are installed with a horizontal column 603, the two ends of the outer wall of the horizontal column 603 are both installed with a second contact 605, and the inner wall of the fixed frame 601 is embedded with a first contact 604 corresponding to the second contact 605. According to whether the first contact 604 and the second contact 605 are in contact, an electric signal is sent to judge whether the battery cell 5 expands.

[0035] It should be noted that the first contact 604 and the second contact 605 are in communication with the battery management system, when the first contact 604 and the second contact 605 contact to generate an electrical signal, feedback to the battery management system, and then feedback to the user by the battery management system, improve the safety of the battery module, the fixed frame 601 is a long rectangle with two ends concave, through the two ends concave and the battery cell 5 fit, when the battery cell 5 of one end of the fixed frame 601 occurs swelling deformation, it can exert pressure on one end of the fixed frame 601, cause deformation, and then make the second contact 605 and the first contact 604 contact, generate an electrical signal, through the fixed frame 601 installed in the installation site 104, the position of the battery cell 5 can be fully fixed.

[0036] As shown in Figure 5 、 Figure 6 and Figure 10 , the cooling mechanism 7 includes a cooling pipe 701 installed in the through slot 108 and a cylinder 709 installed at the exhaust pipe opening of the cooling pipe 701, an air pump 702 is installed at the air inlet opening of the cooling pipe 701, the air inlet opening of the cooling pipe 701 is located in the air cooling groove 105, the exhaust pipe opening of the cooling pipe 701 faces the outside of the liquid cooling block 103, a limiting ring 703 and a movable limiting seat 705 are installed on the inner wall of the cooling pipe 701 near the air inlet opening, a plurality of movable cooling beads 704 are placed between the limiting ring 703 and the limiting seat 705 inside the cooling pipe 701, a spring 706 is fixedly connected to the outer wall of the limiting seat 705, the other end of the spring 706 is fixedly connected with a mounting plate 711 installed in the exhaust slot 109, and the inner wall of the cylinder 709 is provided with a placement groove block 710 for limiting ventilation; the outer wall of the cooling bead 704 is made of high thermal conductivity metal, the inside of the cooling bead 704 is filled with phase change material, a circular ring 707 is rotatably connected to the middle part of the outer wall of the cooling pipe 701 in the air cooling groove 105, and a plurality of fan blades 708 are installed on the outer wall of the circular ring 707.

[0037] It should be noted that the number of cooling mechanism 7 is multiple, the role of cooling mechanism 7 is to cool the liquid cooling block 103 segment which is in contact with the outer wall of two battery units 5, when cooling is needed, through the start of air pump 702, the air is extracted to extrude the limiting ring 703, cooling beads 704, limiting seat 705 and spring 706, through extrusion to move, through the action of cooling beads 704, it can fully absorb the heat of the cooling liquid in the liquid cooling block 103 conducted by the cooling pipe 701, so that the temperature of the cooling liquid is quickly reduced, which is beneficial to quickly cool the battery unit 5 and cope with sudden thermal runaway of the battery unit 5. At the same time, the wind blows the ball to make it move, which increases the contact area of the ball and the cooling liquid, thereby improving the heat exchange efficiency. When cooling the cooling beads 704, move the cooling beads 704 to the placing groove 710, which can prevent the cooling beads 704 from moving continuously. At the same time, the air cools the cooling beads 704. After cooling, close the air pump 702. Through the action of spring 706, the limiting ring 703, cooling beads 704 and limiting seat 705 are reset. Start the air pump 702 again to cool and cool the next time. High thermal conductivity metal can be copper and other materials. According to actual use requirements, select materials with appropriate phase change temperature (such as paraffin, salt water, etc.) to ensure efficient heat exchange in the required working temperature range. Through the cooperation of ring 707 and fan blade 708, it can rotate under the influence of airflow when the air inlet mechanism 8 starts, thereby increasing the contact area of airflow and part of the inner wall of air cooling groove 105, which is beneficial to increase the contact area and improve the heat exchange efficiency. By controlling the opening and closing of air pump 702 on cooling pipe 701, whether to cool and cool can be controlled. When the temperature threshold is reached, the air pump 702 is automatically started and stopped to cool and cool quickly, which is convenient for coping with sudden thermal runaway and reducing loss.

[0038] As shown in Figure 1 The top and bottom of the battery unit 5 are respectively provided with an upper connecting plate 2 and a lower connecting plate 11, and the upper connecting plate 2 and the lower connecting plate 11 are connected to complete the connection of the battery unit 5. The inner wall of the square liquid cooling frame 101 is provided with a support frame 9 at the four corners. The top and bottom of the support frame 9 are respectively provided with a top plate 3 and a bottom plate 10. The top plate 3 is provided with a connecting end 4 electrically connected to the upper connecting plate 2 and the lower connecting plate 11. The bottom outer wall of the bottom plate 10 is provided with a vertical groove 13 penetrating through the upper connecting plate 2, the lower connecting plate 11, the bottom plate 10 and the top plate 3 corresponding to the air cooling groove 105 and the spacing channel.

[0039] It should be noted that the upper connecting plate 2 and the lower connecting plate 11 are integrated with connectors for connecting several battery units 5 in series, parallel or mixed connection. Through the vertical groove 13, the air flow of the air inlet mechanism 8 can be facilitated.

[0040] As Figure 7 shown, the air inlet mechanism 8 includes an air inlet box 801 mounted on the outer wall of the bottom of the bottom plate 10, and a plurality of partitions 805 are mounted in the air inlet box 801. The air cooling groove 105 and the spacing channel are divided into multiple areas by the plurality of partitions 805. Ventilation pipes 802 corresponding to the areas are mounted on the outer walls of both ends of the air inlet box 801. Valves 803 are mounted on the outer walls of the ventilation pipes 802. A gas collecting pipe 804 connected with the ventilation pipes 802 is mounted on the air inlet box 801.

[0041] It should be noted that the interior of the air inlet box 801 is divided into multiple areas by the partitions 805 in the air inlet box 801. Each area corresponds to a transverse vertical groove 13, and further corresponds to a transverse air cooling groove 105 or a spacing channel. By cooperating the opening and closing of the valves 803 with the partitions 805, the battery unit 5 in a single area or multiple areas can be cooled or temperature-regulated according to the use requirements, which is beneficial to use. When temperature regulation is needed, the gas collecting pipe 804 needs to be connected to an external fan.

[0042] As Figure 2 shown, a plurality of heat dissipation fins 102 are mounted on the outer wall of the square liquid cooling frame 101. The heat dissipation fins 102 are "T" shaped. The "H" shaped structure is formed by the plurality of "T" shaped heat dissipation fins 102 and the square liquid cooling frame 101, which improves the anti-collision and anti-extrusion capability of the square liquid cooling frame 101.

[0043] It should be noted that the contact area between the cooling liquid and the outside world can be increased by the plurality of heat dissipation fins 102, which improves the heat exchange efficiency and accelerates the heat dissipation of the cooling liquid in the square liquid cooling frame 101. Moreover, the "H" shaped structure is formed by the T-shaped design, which fully improves the anti-collision and anti-extrusion capability of the square liquid cooling frame 101, which is beneficial to protect the battery unit 5.

[0044] As Figure 2 , Figure 3 and Figure 11 shown, an aluminum alloy ring 15 is mounted on the outer wall of the battery unit 5. Positioning grooves 12 are opened in the four boundaries of the top outer wall of the top plate 3. Positioning columns 14 adapted to the positioning grooves 12 are mounted on the four boundaries of the bottom outer wall of the bottom plate 10.

[0045] It should be noted that the aluminum alloy ring 15 can help the rapid conduction of heat of the battery unit 5. The aluminum alloy is relatively light, which helps to reduce the overall weight. The surface-treated aluminum alloy ring can increase the corrosion resistance of the battery unit 5. The positioning grooves 12 and the positioning columns 14 can facilitate the mutual stacking and fixing of a plurality of battery modules without the air inlet mechanism 8.

[0046] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the embodiments disclosed except insofar as recited in the claims.

Claims

1. A battery module, comprising a liquid cooling mechanism (1), characterized in that: The liquid cooling mechanism (1) includes a square liquid cooling frame (101), inside which a liquid cooling block (103) is provided. The liquid cooling block (103) has several mounting positions (104) and air-cooling channels (105). Laterally adjacent mounting positions (104) are separated by partitions. The air-cooling channels (105) are all located between vertically adjacent partitions. The liquid cooling block (103) is a hollow structure. Connecting pipes (107) are installed at the top and bottom of the square liquid cooling frame (101) and the liquid cooling block (103). A liquid pump (106) is installed on the connecting pipe (107). The square liquid cooling frame (101) and the liquid cooling block (103) form a liquid flow loop through the connecting pipe (107) and the liquid pump (106). The mounting positions (104) are equipped with... The battery unit (5) is installed in adjacent mounting positions (104) and the battery units (5) are inverted relative to each other. The bottom of the liquid cooling mechanism (1) is provided with an air intake mechanism (8) for blowing air into the spacer channel and air cooling groove (105) on the liquid cooling block (103). Several through grooves (108) penetrating the horizontally adjacent air cooling grooves (105) are opened on the outer walls of both ends of the liquid cooling block (103). The outer walls of both ends of the square liquid cooling frame (101) are provided with exhaust grooves (109) corresponding to the through grooves (108). A cooling mechanism (7) for cooling the cooling liquid in the contact surface of the vertically adjacent battery units (5) is installed in the through groove (108). An expansion detection mechanism (6) for detecting whether the battery unit (5) has expanded and deformed is installed in the spacer channel. The cooling mechanism (7) includes a cooling pipe (701) installed in the through groove (108) and a cylinder (709) installed at the exhaust port of the cooling pipe (701). An air pump (702) is installed at the air inlet of the cooling pipe (701). The air inlet of the cooling pipe (701) is located in the air-cooled groove (105). The exhaust port of the cooling pipe (701) faces the outside of the liquid cooling block (103). A limit ring (703) and a limit seat (705) are installed on the inner wall of the cooling pipe (701) near the air inlet. A number of cooling beads (704) are placed inside the cooling pipe (701) between the limiting ring (703) and the limiting seat (705). The limiting seat (705) and the cooling beads (704) move in the cooling pipe (701). A spring (706) is fixedly connected to the outer wall of the limiting seat (705). The other end of the spring (706) is fixedly connected to the mounting plate (711) installed in the exhaust duct (109). The top and bottom of the inner wall of the cylinder (709) are equipped with placement slots (710) for limiting ventilation. The outer wall of the cooling bead (704) is made of metal, and the interior of the cooling bead (704) is filled with phase change material. The middle part of the outer wall of the cooling pipe (701) is rotatably connected to a ring (707) in the air-cooling groove (105). Several fan blades (708) are installed on the outer wall of the ring (707).

2. A battery module according to claim 1, characterized in that: The expansion detection mechanism (6) includes a fixed frame (601) installed in the spacer channel. The two ends of the fixed frame (601) are attached to the outer wall of the horizontally adjacent battery unit (5). Fixed columns (602) are installed on both sides of the inner wall of the fixed frame (601). A horizontal column (603) is installed between the fixed columns (602). The outer walls of both ends of the horizontal column (603) are equipped with second contacts (605). The inner wall of the fixed frame (601) and the corresponding position of the second contact (605) are embedded with first contacts (604). The battery unit (5) is judged to have expanded deformation based on whether the first contact (604) and the second contact (605) are in contact and an electrical signal is emitted.

3. A battery module according to claim 1, characterized in that: The top and bottom of the battery unit (5) are respectively equipped with an upper connecting plate (2) and a lower connecting plate (11). The battery unit (5) is connected by the cooperation of the upper connecting plate (2) and the lower connecting plate (11). Support frames (9) are installed on the four corners of the inner wall of the square liquid cooling frame (101). The top and bottom of the support frame (9) are respectively equipped with a top plate (3) and a bottom plate (10). The top plate (3) is equipped with a connecting end (4) that is electrically connected to the upper connecting plate (2) and the lower connecting plate (11). The bottom outer wall of the bottom plate (10) is provided with a vertical groove (13) that corresponds to the air cooling groove (105) and the spacer channel and passes through the upper connecting plate (2), the lower connecting plate (11), the bottom plate (10) and the top plate (3).

4. A battery module according to claim 1, characterized in that: The air intake mechanism (8) includes an air intake box (801) installed on the bottom outer wall of the base plate (10). Several partitions (805) are installed in the air intake box (801). The air-cooled slot (105) and the partition channel are divided into multiple areas by the partitions (805). Ventilation pipes (802) corresponding to the areas are installed on the outer walls of both ends of the air intake box (801). Valves (803) are installed on the outer walls of the ventilation pipes (802). An air collection pipe (804) connected to the ventilation pipes (802) is installed on the air intake box (801).

5. A battery module according to claim 1, characterized in that: The outer wall of the square liquid cooling frame (101) is equipped with several heat dissipation fins (102). The heat dissipation fins (102) are "T" shaped. The multiple "T" shaped heat dissipation fins (102) and the square liquid cooling frame (101) form an "H" shaped structure, which improves the anti-collision and anti-squeezing ability of the square liquid cooling frame (101).

6. A battery module according to claim 1, characterized in that: An aluminum alloy ring (15) is installed on the outer wall of the battery unit (5), and positioning grooves (12) are provided on the four boundaries of the top outer wall of the top plate (3). Positioning posts (14) that are adapted to the positioning grooves (12) are installed on the four boundaries of the bottom outer wall of the bottom plate (10).

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