Side liquid cooling energy storage system

Abstract

The invention belongs to the technical field of energy storage equipment, and particularly relates to a side face liquid cooling energy storage system which comprises a cabinet body, a liquid cooling unit and a plurality of battery packs, the battery packs are stacked on the upper portion in the cabinet body, the liquid cooling unit is installed on the lower portion in the cabinet body, and a liquid inlet pipe and a liquid outlet pipe which are communicated with the liquid cooling unit are arranged on the two sides of the cabinet body respectively; the battery pack comprises a box body, cooling pipes and a plurality of battery modules, the plurality of battery modules are mounted in the box body, the cooling pipes are wound along each battery module one by one and are in contact with two sides of each battery module, and two ends of each cooling pipe extend out of the corresponding box body and are respectively communicated with a liquid inlet pipe and a liquid outlet pipe; according to the scheme, installation is simplified, and the liquid leakage risk is reduced; the cooling pipe in the battery pack is not easy to leak, so that the risk of liquid leakage is reduced; the water inlet temperature is increased, the condensation risk can be reduced, and battery cell short circuit and shell corrosion caused by condensate water are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to a side liquid-cooled energy storage system. Background Art

[0002] The cooling solutions for battery packs include air cooling, water cooling or direct cooling. Among them, traditional water cooling generally uses a liquid cooling unit and a bottom cold plate. The compressor converts the low-pressure gas (refrigerant) into a high-pressure gas and sends it to the condenser. The condenser converts the high-pressure gas into a liquid. The liquid refrigerant passes through the evaporator. The evaporator converts the refrigerant from liquid to gas, absorbs the heat in the circulating water, and the cooled circulating water flows through the pump body. The circulating water enters the liquid cooling plate through the liquid inlet pipe. The liquid cooling plate is located at the bottom of the battery pack. After absorbing the heat in the battery pack, the circulating water in the liquid cooling plate returns to the evaporator through the liquid outlet pipe to complete the refrigeration cycle. However, the chemical reaction inside the battery cell and the current in and out of the tabs make the middle and upper parts of the battery module (composed of multiple battery cells) generate a large amount of heat. The liquid cooling plate is set at the bottom of the battery pack, which is far away from the main heating area, affecting the heat dissipation effect.

[0003] In order to solve the above problems, there is a side-cooled battery pack in the prior art, in which multiple cold plates require liquid inlet / outlet pipes to be diverted through branches and then connected to the cold plates through joints, forming a parallel flow channel. The circulating water passes directly through the side of the battery module through the cold plate, close to the main heating area, thereby improving the heat dissipation effect; however, the following deficiencies still exist during assembly and use; the internal circulating water needs to be diverted, and there may be a problem of uneven flow, which in turn leads to uneven hot and cold inside the battery pack; the connection between the cold plate, joints, and branch pipes is generally welded, and a large number of welding points will not only lead to a longer assembly time, but also make the welding position prone to leakage, thereby increasing the risk of leakage in the battery pack. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a side liquid-cooled energy storage system, which solves the technical problems of uneven cooling and heating inside the battery pack and high risk of leakage in the existing side-cooled battery pack.

[0005] The technical solution adopted by the present invention is as follows: A side liquid-cooled energy storage system comprises a cabinet, a liquid cooling unit and a plurality of battery packs, wherein the plurality of battery packs are stacked in the upper part of the cabinet, the liquid cooling unit is installed in the lower part of the cabinet, and a liquid inlet pipe and a liquid outlet pipe connected to the liquid cooling unit are respectively arranged on both sides of the cabinet; The battery pack includes a box body, a cooling tube and a plurality of battery modules. The plurality of battery modules are installed in the box body. The cooling tubes are arranged along each battery module one by one and contact with both sides of each battery module. Both ends of each cooling tube extend out of the corresponding box body and are respectively connected with a liquid inlet pipe and a liquid outlet pipe.

[0006] Compared with the prior art, the present invention has the following beneficial effects: 1. As a whole cooling pipe, the connection between it and the liquid inlet pipe and the liquid outlet pipe is located outside the battery pack, which reduces the number of welding points and joints, simplifies installation, and reduces the risk of leakage. It makes it less likely for the cooling pipe inside the battery pack to leak, reduces the risk of leakage, and avoids coolant leakage causing short circuit of the battery cell; 2. The cooling pipe is a single channel without branch pipes, so the internal coolant / refrigerant will not be diverted, and the problem of uneven flow in the parallel side cooling structure in the prior art will not occur; 3. The cooling pipe is close to the side of the battery module and closer to the main heating area of ​​the battery module. Therefore, compared with the bottom cooling solution, when the battery module has the same heat generation, the temperature of the coolant entering the cooling pipe can be higher, achieving the same cooling effect, reducing the power of the compressor and reducing energy consumption; 4. Since the condensation phenomenon is related to the ambient temperature and humidity, when the refrigeration system is working, the overall temperature of the coolant in the liquid inlet pipe, liquid outlet pipe and cooling pipe increases, which can reduce the risk of condensation and avoid battery cell short circuit and shell corrosion caused by condensed water.

[0007] As a preferred embodiment of the present invention, the lower part of the cabinet is provided with an upper installation cavity and a lower installation cavity, a partition plate is arranged between the upper installation cavity and the lower installation cavity, the partition plate prevents hot air from flowing back, the liquid cooling unit is installed in the lower installation cavity, and the PCS is installed in the upper installation cavity.

[0008] Beneficial effect: By installing the liquid cooling unit in the lower installation cavity and separating it from the PCS, during heat dissipation, the partition plate makes it difficult for the hotter airflow in the lower installation cavity to enter the upper installation cavity, thereby ensuring the heat dissipation efficiency of the PCS and improving the overall cooling effect.

[0009] As a preferred embodiment of the present invention, heat-conducting insulating glue is filled between the cooling tube and the side wall of each battery module.

[0010] Beneficial effects: 1. By setting the thermal conductive insulating glue, the insulation performance of the battery module can be increased, and the connection between the battery module and the cooling tube can be made more stable, and pre-positioning can be performed to avoid the rebound of the cooling tube after extrusion; 2. During installation, first adhere thermally conductive insulating glue to the side wall of each battery module, and then place the cooling tube. After extrusion by the extrusion device, the cooling tube is extruded on the side wall of the battery module and adhered to the thermally conductive insulating glue. Since the side of the battery module is not a complete plane (there is a gap between the battery cells), the gap between the cooling tube and the side wall of the battery module can be filled by setting the thermally conductive insulating glue (the air in the gap will affect the heat exchange efficiency between the battery cell and the cooling tube), thereby ensuring the heat dissipation effect.

[0011] As a preferred embodiment of the present invention, a support frame is fixedly connected to the bottom plate, the support frame supports the cooling pipe, and the same end of the plurality of battery modules is closely attached to the inner side of the support frame.

[0012] Beneficial effects: During assembly, the support frame can position the battery module and the cooling pipe. When the cooling pipe is made of aluminum pipe, it can be extruded and shaped by an extrusion device (hydraulic cylinder or air cylinder). The support frame limits the height direction of the cooling pipe. The support frame limits the end of the battery module. The extrusion devices on both sides of the bottom plate can ensure the relative position of the cooling pipe and the battery module when extruding the cooling pipe and the battery module.

[0013] As a preferred embodiment of the present invention, two side plates are arranged in the box body, and the two side plates limit the lateral position of the multiple battery modules.

[0014] Beneficial effect: After extrusion is completed, side plates are installed on both sides of the bottom plate to perform secondary positioning on both sides of the extruded cooling tube; by setting the side plates to limit the cooling tube, it is prevented from rebounding and causing the cooling tube to detach from the side wall of the battery module.

[0015] As a preferred embodiment of the present invention, a one-way waterproof and breathable valve is installed on the box.

[0016] Beneficial effect: By setting up an explosion-proof valve and utilizing the waterproof property of the explosion-proof valve, after the battery pack is assembled, a vacuum pump can be used to connect to the waterproof breathable valve to extract the air in the box and put it in a vacuum state. After removing the vacuum pump, the negative pressure in the box automatically inhales the outside air, and the water vapor in the air is intercepted in the waterproof breathable valve, thereby ensuring the dryness of the box.

[0017] As a preferred embodiment of the present invention, the cooling pipe is integrally formed and is an aluminum square tube obtained by extrusion, and the aluminum square tube is bent multiple times to obtain the cooling pipe.

[0018] Beneficial effects: 1. Since the cooling pipe is integrally formed, the overall structural strength is high, and the part inside the battery pack does not need to be welded, so it is not easy to have leakage points; 2. The existing parallel side cooling structure adopts a combination of side cooling plates and plastic pipes. The plastic pipes cannot withstand the pressure of the refrigerant flowing. If the plastic pipes are directly replaced with metal pipes to withstand greater pressure, the side cooling plates and metal pipes will not be able to dock when they are installed (the joints used for docking of the side cooling plates are generally welded on the bottom plate. Due to processing errors, the position of each joint cannot be guaranteed to be accurate. The plastic pipes themselves are flexible and can adapt to the errors. However, the metal pipes cannot adjust the position of the docking ports. In order to ensure the sealing, the metal pipes and joints need to be welded again. The installation process is more complicated. Welding makes the entire structure difficult to disassemble, which is inconvenient when repairing the battery module. Therefore, the cooling pipes of this solution can be applied to direct cooling units.

[0019] 3. When installing the side cold plate, multiple battery modules can be placed on the bottom plate of the battery pack, and then the cooling pipes can be placed so that the cooling pipes are located on both sides of the multiple battery modules. Then, the cooling pipes and the multiple battery modules are squeezed inwardly and shaped through the extrusion devices (hydraulic cylinders, air cylinders) on both sides. Therefore, the cooling pipes also have a certain limiting effect on the battery modules, making the overall structure more stable. Compared with the parallel side cooling structure in the prior art, multiple welding inside the battery pack is not required, and the installation is more convenient and quick.

[0020] As a preferred embodiment of the present invention, the cooling tube is staggered with multiple side tubes and end tubes, the connection between the side tubes and the end tubes is rounded, the side tubes correspond to the sides of each battery module, and the end tubes correspond to the ends of each battery module.

[0021] Beneficial effects: rounded corners are provided between the end pipe and the side pipe, which facilitates extrusion processing, and when the cooling pipe is squeezed during installation, the end pipe with rounded corners is not easily deformed excessively, causing damage to the pipe.

[0022] As a preferred embodiment of the present invention, a switching structure is further included, and both ends of the cooling pipe are connected to the liquid inlet pipe and the liquid outlet pipe of the refrigeration equipment through the corresponding switching structures.

[0023] Beneficial effect: By setting the transfer structure, it is convenient to install the cooling pipe and the liquid inlet pipe and the liquid outlet pipe.

[0024] As a preferred embodiment of the present invention, the transition structure includes a sealing plate and a joint, the sealing plate is provided with a first through hole, the cooling pipe passes through the first through hole and is fixedly connected to the sealing plate, and the joint is connected to the end of the cooling pipe; The upper cover side wall is fixedly connected with a fixing plate, the fixing plate is provided with a second through hole, the sealing plate is pressed tightly against the inner side of the fixing plate, and the end of the cooling pipe passes through the second through hole and is fixedly connected with the joint, so that the joint is located on the outer side of the fixing plate; The transfer structure further comprises a connection block, which is fixedly connected to the sealing plate and extends out of the second through hole, wherein a connecting cavity is provided in the connection block, and the cooling pipe is connected to the joint through the connecting cavity; A glue injection groove is arranged on the inner side of the connection block around the cooling pipe, and the glue injection groove is filled with sealant.

[0025] Beneficial effects: 1. Since the connection between the connector and the cooling pipe has the highest risk of leakage (leakage occurs during welding), the sealing plate is close to the fixing plate, blocking the second via hole to ensure the sealing inside the battery pack. The connector is placed outside the sealing plate, that is, outside the battery pack, reducing the risk of leakage inside the battery pack. 2. The connection block is used to connect the joint and the cooling pipe. Since the connection block can pass through the second through hole, during welding and installation, the welding point between the connection block and the sealing plate is located outside the sealing plate, that is, outside the battery pack, thereby preventing leakage inside the battery pack. 3. By setting up the glue injection groove and injecting the sealant, the sealant can bond the sealing plate, the connecting block and the cooling pipe to make the connection more stable, and can also block the gap between the cooling pipe and the connecting block to ensure the sealing.

[0026] As a preferred embodiment of the present invention, the fixing plate includes a circular plate and a receiving groove, the circular plate is mounted on the inner wall of the upper cover by screws, the receiving groove is located on the inner side of the upper cover and is pressed against the sealing plate, the receiving groove is fixedly connected to the inner wall of the circular plate and is connected to the sealing plate by screws; the second through hole is located on the receiving groove, the connecting block passes through the second through hole, and is located in the receiving groove.

[0027] Beneficial effects: 1. In some battery cabinets, the battery packs are stacked in the cabinet, and the space between the front end of the battery pack and the cabinet door is relatively narrow. If the connection block and the connector are directly arranged outside the side wall of the upper cover, the cabinet door cannot be closed. In this solution, the connection block is located in the receiving groove, so that the transfer structure does not have many protruding parts relative to the upper cover, occupies less external space, and is more beautiful; 2. The cooling pipe in the scheme is made of aluminum tube, which can undergo plastic deformation under the action of a certain external force. When tightening the screws between the sealing plate and the receiving groove, the slight deviation of the sealing plate and the cooling pipe (due to the processing error caused by processing and extrusion) can be corrected due to the continuous tightening of the screws; 3. The upper cover, the fixing plate, the receiving groove and the sealing plate form a sealed shell, so that the connecting block is located on the outside of the sealed shell, the connecting block is welded to the sealing plate, and the joint is welded to the connecting block. Both welding points are located on the outside of the sealed shell, thereby reducing the risk of leakage in the battery pack.

[0028] As a preferred embodiment of the present invention, both ends of the cooling tube are located on the same side of the upper cover; two adjacent side tubes are located between adjacent battery modules; one of the end tubes is bent outward at the connection between two adjacent side tubes to form a spherical head or a square head.

[0029] Beneficial effects: 1. In the parallel side cooling structure, the liquid inlet and outlet are located on the front and rear sides of the battery pack. When the liquid inlet pipe of the liquid cooling unit is located on the front of the battery pack, the liquid outlet pipe needs to go around to the back of the battery pack to connect with the liquid outlet, which makes the pipeline laying more complicated and the required length of the pipeline will also increase. During maintenance, it may be necessary to open the back panel of the battery cabinet. In this solution, when the liquid inlet and outlet of the cooling pipe are located on the same side, it is more convenient to connect with the liquid cooling unit / direct cooling unit, the pipeline length will not increase, and it is more convenient for maintenance; 2. The two sections of the side tubes that are repeatedly wound are between two adjacent battery modules. If the end tube between the two sections of the side tubes is an inwardly bent fillet, in order to avoid breakage due to bending, it is necessary to ensure that there is a certain distance between the two sections of the side tubes, so that the spacing between the adjacent battery modules at this location is different from the spacing between other adjacent battery modules, and installation cannot be performed. When the cooling tubes are extruded and installed, the side tubes at both ends will inevitably be close to each other, and the inwardly bent end tubes will tend to bend inwards, which will cause the end tubes to break. Therefore, in order to make the total thickness of the two sections of the side tubes thin enough, a round head or a square head is provided at the end of the section of the pipe to meet the bending processing technology. During installation, the side tubes are squeezed, and the outwardly bent end tubes will tend to continue to bend outwards, avoiding the end tubes from bending inwards and causing breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the cooling tube in the first embodiment of the side liquid-cooled energy storage system of the present invention; Figure 2 It is a schematic diagram of the internal structure of the battery pack in the first embodiment of the side liquid-cooled energy storage system of the present invention; Figure 3 Schematic diagram of the structure of the battery pack of the first embodiment of the side liquid-cooled energy storage system of the present invention; Figure 4 It is a structural schematic diagram of a fixed plate in Embodiment 1 of the side liquid-cooled energy storage system of the present invention; Figure 5 It is a structural schematic diagram of a switching structure in an embodiment of the side liquid-cooled energy storage system of the present invention; Figure 6 It is a structural schematic diagram of the second embodiment of the side liquid-cooled energy storage system of the present invention.

[0031] The reference numerals include: cooling tube 1, liquid inlet 11, liquid outlet 12, ball head 13, side tube 14, end tube 15, box body 2, bottom plate 21, upper cover 22, battery module 23, support frame 24, fixing plate 3, circular plate 31, accommodating groove 32, second through hole 33, sealing plate 41, first through hole 42, connecting block 43, connecting cavity 44, joint 45, glue injection groove 46, cabinet body 51, battery pack 52, liquid cooling unit 53, upper mounting cavity 54, lower mounting cavity 55. DETAILED DESCRIPTION

[0032] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0033] In the description of the present application, the terms "first", "second", etc. are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] Embodiment 1: See also Figure 1 , Figure 2 , Figure 3 The present embodiment discloses a side liquid-cooled energy storage system, comprising a liquid cooling unit 53, a cabinet 51 and a plurality of battery packs 52, wherein the plurality of battery packs 52 are stacked in the upper part of the cabinet 51, the liquid cooling unit 53 is installed in the lower part of the cabinet 51, and both sides of the cabinet 51 are respectively provided with a liquid inlet pipe and a liquid outlet pipe connected to the liquid cooling unit 53, the battery pack 52 comprises a box body, a cooling pipe 1 and a plurality of battery modules, the box body comprises a bottom plate 21, an upper cover 22 and a plurality of battery modules 23; the cooling pipe 1 is integrally formed, and two adapter structures are provided at both ends.

[0035] Among them, see Figure 2 A support frame 24 is fixedly connected to the bottom plate 21, and the support frame 24 supports the cooling pipe 1. The same end of multiple battery modules 23 is close to the inner side of the support frame 24; the cooling pipe 1 is wound along each battery module 23 one by one, and contacts with both sides of each battery module 23, and a strip of thermal conductive insulating glue is bonded to the side wall of each battery module 23; the two adapter structures are respectively installed at both ends of the cooling pipe 1, and both extend out of the side wall of the upper cover 22, and are detachably connected to the upper cover 22; the two ends of the cooling pipe 1 are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the refrigeration equipment through the corresponding adapter structures.

[0036] Among them, see Figure 4 , Figure 5The transition structure includes a connecting block 43, a sealing plate 41 and a joint 45. The sealing plate 41 is provided with a first through hole 42. The cooling pipe 1 passes through the first through hole 42 and is fixedly connected to the sealing plate 41. The joint 45 is connected to the end of the cooling pipe 1. The side wall of the upper cover 22 is fixedly connected to a fixing plate 3. The fixing plate 3 is provided with a second through hole 33. The sealing plate 41 is pressed tightly against the inner side of the fixing plate 3. The connecting block 43 is welded on the sealing plate 41 and extends out of the second through hole 33. A connecting cavity 44 is provided in the connecting block 43. The cooling pipe 1 is connected to the joint 45 through the connecting cavity 44. A glue injection groove 46 is provided on the inner side of the connecting block 43 around the cooling pipe 1. The glue injection groove 46 is filled with sealant.

[0037] Among them, see Figure 4 , Figure 5 The fixing plate 3 includes a circular plate 31 and a receiving groove 32. The circular plate 31 is installed on the inner wall of the upper cover 22 by screws. The receiving groove 32 is fixedly connected to the inner wall of the circular plate 31 and is located on the inner side of the upper cover 22. It is connected to the sealing plate 41 by screws. The second through hole 33 is located on the receiving groove 32. The connecting block 43 passes through the second through hole 33 and is located in the receiving groove 32.

[0038] In this embodiment, in some battery cabinets, the battery packs 52 are stacked in the cabinet body 51, and the space between the front end of the battery pack 52 and the cabinet door is relatively narrow. Directly setting the connection block 43 and the joint 45 outside the side wall of the upper cover 22 will cause the cabinet door to be unable to close. In this solution, the connection block 43 is located in the accommodating groove 32, so that the transition structure does not have more protruding parts relative to the upper cover 22, occupies less external space, and is more beautiful; the cooling pipe 1 in the solution is made of aluminum pipe, which can undergo plastic deformation under the action of a certain external force, When tightening the screws between the sealing plate 41 and the receiving groove 32, the slight offset of the sealing plate 41 and the cooling tube 1 (due to processing errors caused by processing and extrusion) can be corrected as the screws are continuously tightened; the upper cover 22, the fixing plate 3, the receiving groove 32, and the sealing plate 41 form a sealed shell, so that the connecting block 43 therein is located on the outside of the sealed shell, the connecting block 43 is welded to the sealing plate 41, and the joint 45 is welded to the connecting block 43, and both welding points are located on the outside of the sealed shell, thereby reducing the risk of leakage in the battery pack 52.

[0039] Among them, see Figure 1 The cooling tube 1 is an aluminum square tube obtained by extrusion, and the aluminum square tube is bent multiple times to obtain the cooling tube 1; the cooling tube 1 is staggered with multiple side tubes 14 and end tubes 15, and the connection between the side tubes 14 and the end tubes 15 is rounded, the side tubes 14 correspond to the side of each battery module 23, and the end tubes 15 correspond to the end of each battery module 23.

[0040] The two ends of the cooling tube 1 are located on the same side of the upper cover 22; two adjacent side tubes 14 are located between adjacent battery modules 23; one of the end tubes 15 is bent outward at the connection between two adjacent side tubes 14 to form a ball head 13 or a square head.

[0041] The installation method of this embodiment is as follows, including the following steps: The plurality of battery modules 23 with insulating sealant are positioned on the bottom plate 21 by means of the support frame 24, and the ends of the plurality of battery modules 23 are pressed against the inner side of the support frame 24, and the cooling pipe 1 is placed from top to bottom so that the cooling pipe 1 is wound around both sides of the battery module 23; Through two sets of extrusion mechanisms, the cooling tube 1 and the battery module 23 are extruded inward from both sides of the bottom plate 21 simultaneously, so that the side wall of the cooling tube 1 contacts the side wall of the battery module 23; The sealing plate 41, the connecting block 43 and the joint 45 in the transition structure have been welded before assembly. The fixing plate 3 is installed on the inner side of the upper cover 22 by screws, and the cooling pipe 1 is inserted into the connecting cavity 44 through the first through hole 42. The sealing plate 41 and the cooling pipe 1 are welded and fixed, and filling glue is injected into the glue injection groove 46. The upper cover 22 is buckled on the bottom plate 21, and the sealing plate 41 and the fixing plate 3 are connected by screws to complete the assembly.

[0042] The upper cover 22 is provided with a waterproof breathable valve and an air extraction port, and air can only enter the box body 2 through the waterproof breathable valve. The air extraction port is provided with a control valve for controlling the opening and closing of the air extraction port.

[0043] The drying method of the present embodiment is as follows: The vacuum pump is connected to the waterproof breathable valve or the air extraction port; The air in the box 2 is extracted using a vacuum pump.

[0044] A vacuum pump is used to extract the original air in the box body 2 to form a negative pressure, so that the waterproof breathable valve continuously takes in air. The water vapor in the newly entering air is intercepted by the waterproof breathable valve, thereby drying the inside of the battery pack 52. The humidity in the battery pack 52 is low, the local temperature difference is small, and condensation water is not easy to generate.

[0045] Embodiment 2: See also Figure 6 On the basis of the first embodiment, an upper mounting cavity 54 and a lower mounting cavity 55 are provided at the lower portion of the cabinet 51, a partition plate is provided between the upper mounting cavity 54 and the lower mounting cavity 55, the partition plate prevents hot air from flowing back, the liquid cooling unit 53 is installed in the lower mounting cavity 55, and the PCS is installed in the upper mounting cavity 54.

[0046] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A side liquid-cooled energy storage system, characterized in that: It includes a cabinet, a liquid cooling unit and a plurality of battery packs, wherein the plurality of battery packs are stacked in the upper part of the cabinet, the liquid cooling unit is installed in the lower part of the cabinet, and a liquid inlet pipe and a liquid outlet pipe connected to the liquid cooling unit are respectively arranged on both sides of the cabinet; The battery pack includes a box body, a cooling tube and a plurality of battery modules. The plurality of battery modules are installed in the box body. The cooling tubes are arranged along each battery module one by one and contact with both sides of each battery module. Both ends of each cooling tube extend out of the corresponding box body and are respectively connected with a liquid inlet pipe and a liquid outlet pipe.

2. The side liquid-cooled energy storage system according to claim 1, characterized in that: The lower part of the cabinet is provided with an upper installation cavity and a lower installation cavity, a partition plate is provided between the upper installation cavity and the lower installation cavity, the partition plate prevents hot air from flowing back, the liquid cooling unit is installed in the lower installation cavity, and the PCS is installed in the upper installation cavity.

3. The side liquid-cooled energy storage system according to claim 2, characterized in that: The space between the cooling tube and the side wall of each battery module is filled with heat-conducting insulating glue.

4. The side liquid-cooled energy storage system according to claim 3, characterized in that: A support frame is fixedly connected to the bottom wall of the box body, and the support frame supports the cooling pipe. The same end of the multiple battery modules is close to the inner side of the support frame.

5. The side liquid-cooled energy storage system according to claim 4, characterized in that: The box body is provided with two side plates, which limit the lateral position of the multiple battery modules.

6. The side liquid-cooled energy storage system according to claim 1, characterized in that: A one-way waterproof and breathable valve is installed on the box body.

7. The side liquid-cooled energy storage system according to claim 1, characterized in that: The cooling pipe is integrally formed and is an aluminum square pipe obtained by extrusion. The aluminum square pipe is bent multiple times to obtain the cooling pipe.

8. The side liquid-cooled energy storage system according to claim 1, characterized in that: The cooling tube is staggered with a plurality of side tubes and end tubes, the connection between the side tubes and the end tubes is rounded, the side tubes correspond to the side surfaces of each battery module, and the end tubes correspond to the ends of each battery module.

9. The side liquid-cooled energy storage system according to claim 1, characterized in that: The two ends of the cooling tube are located on the same side of the upper cover; two adjacent side tubes are located between adjacent battery modules; one of the end tubes is bent outward at the connection between two adjacent side tubes to form a ball head or a square head.

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