Battery structure with a flexible water-cooling plate

Abstract

Battery structure with a flexible water-cooling plate, including a plurality of battery modules, the battery modules are arranged in multiple rows in a straight line, and further including a flexible water-cooling plate disposed between the battery modules, the flexible water-cooling plate is arranged between the gaps of the adjacent linearly arranged battery modules; the flexible water-cooling plate is formed by enclosing and fitting long strip-shaped flexible membranes to form a hollow water-cooling cavity, and water nozzles are respectively provided at both ends of the flexible water-cooling plate in the length direction, and the inner holes of the water nozzles are communicated with the water-cooling cavity. In the present invention, the flexible membrane is enclosed and fitted to form a water-cooling cavity. During the operation of the battery, the water-cooling cavity is in an internally pressurized state. Since the flexible water-cooling plate is flexible, it will automatically bulge and fit on the heat exchange surface of the battery module. Even if the flatness of the heat exchange surface of the battery module is poor or the heat exchange surface is not a flat surface, such as the cylindrical surface of a cylindrical battery, it can ensure good fitting between the flexible water-cooling plate and the battery module, and ensure that the thermal resistance of the heat conduction from the battery module to the flexible water-cooling plate is basically the same.

Description

Technical Field

[0001] The present invention relates to the field of new energy batteries, and more specifically to a battery structure with a flexible water-cooling plate. Background Art

[0002] Currently, new energy batteries generally need to be made into battery modules before being assembled into a battery pack. A water-cooling plate is usually installed between the battery modules to enhance battery heat dissipation, improve battery efficiency and safety.

[0003] Existing water-cooling plates are usually made of aluminum alloy. The surface of the aluminum alloy water-cooling plate is not completely flat, and there are a large number of contact gaps during the contact process with the battery module. There is a very large contact thermal resistance during the heat exchange between the aluminum alloy water-cooling plate and the battery. It is necessary to apply a thermal conductive adhesive or other thermal conductive medium between the aluminum alloy water-cooling plate and the battery module to reduce the contact thermal resistance to achieve relatively efficient heat exchange. However, at the places where the gap between the aluminum alloy water-cooling plate and the battery module is large, the thermal conductive adhesive layer will be thicker, which makes the thermal resistance of the thermal conductive adhesive itself larger, the heat transfer slow, the battery temperature high, the temperature difference of the battery system large and the maximum temperature high, which will seriously affect the life consistency between different battery modules and cause the battery system power attenuation to increase. Especially for the case where the battery module is a cylindrical battery, the aluminum alloy water-cooling plate is usually made into a snake shape to cool the battery. Due to manufacturing errors and assembly errors, the snake-shaped aluminum alloy water-cooling plate is in line contact with the cylindrical battery instead of surface contact between the cylindrical surface and the cylindrical surface. Even due to the flatness problem of the aluminum alloy water-cooling plate along the axial plane of the cylindrical battery, it actually only contacts the cylindrical battery at some points, and the gap between the cylindrical batteries is large. Therefore, more thermal conductive adhesive needs to be poured to strengthen heat transfer. However, during the loading and use process of the battery, there will be bumpy vibrations, which will cause the thermal conductive adhesive above to sink, affecting the heat dissipation effect above the battery module. Currently, the thermal conductive design of applying thermal conductive adhesive between the battery module and the water-cooling plate inherently has non-optimizable defects, affecting the battery thermal management effect. At the same time, the amount of thermal conductive adhesive used is very large, and the cost remains high. (The cold plate with the traditional aluminum alloy structure is heavy, the structure is rigid, the manufacturing process is complex, the requirements for equipment are high, there are many defects, and the detection cost is high) and it is very heavy, seriously reducing the energy density of the battery pack. Therefore, it is very important to design a battery structure with better water-cooling effect. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a battery structure with a flexible water-cooling plate. The battery structure with a flexible water-cooling plate of the present invention forms a water-cooling cavity after the flexible film is hermetically adhered. During the operation of the battery, the water-cooling cavity is in an internally pressurized state. Since the flexible water-cooling plate is flexible, it will automatically bulge and adhere to the heat exchange surface of the battery module. Even if the flatness of the heat exchange surface of the battery module is poor or the heat exchange surface is not a flat surface, such as the cylindrical surface of a cylindrical battery, it can ensure good adhesion between the flexible water-cooling plate and the battery module, and ensure that the thermal resistance of the heat conduction from the battery module to the flexible water-cooling plate is basically the same; since the thermal conductive adhesive is discarded, the cost of the thermal conductive adhesive is saved, and the weight of the thermal conductive adhesive is subtracted, further improving the energy density of the battery pack. In addition, since the flexible water-cooling plate is non-metallic, its weight is much lower than that of a metal water-cooling plate, and the processing and transportation costs are also much lower than those of a metal water-cooling plate, which further improves the energy density of the battery pack and reduces the manufacturing cost of the battery pack; in view of the problem that the strength of the flexible film fitting part of the flexible water-cooling plate is weak, the technical solutions of inverting and fitting inward and fitting a reinforcing film outside the joint are adopted to ensure the strength and improve the wear resistance of the side; a mixing film is adhered inside the flexible water-cooling plate to make the coolant flow up and down and mix in the water-cooling cavity, so that the temperatures of the upper and lower layers of the coolant are more uniform, and the service life of the battery module is prolonged; a temperature sensor and a flow control valve are connected to the water outlet of the flexible water-cooling plate. When the battery temperature rises, the flow rate of the coolant in the water-cooling cavity increases, and the pressure also increases. The expansion effect of the flexible water-cooling plate is enhanced, the contact area with the battery module increases, and its cooling effect becomes better.

[0005] The specific technical solution of the present invention is as follows. A battery structure with a flexible water-cooling plate includes a plurality of battery modules, and the battery modules are arranged in multiple rows in a straight line. It also includes a flexible water-cooling plate disposed between the battery modules, and the flexible water-cooling plate is arranged in the gaps between the adjacent linearly arranged battery modules; the flexible water-cooling plate is formed by hermetically adhering and connecting a long strip of flexible film to form a hollow water-cooling cavity. Water nozzles are respectively arranged at both ends of the flexible water-cooling plate in the length direction, and the inner holes of the water nozzles are communicated with the water-cooling cavity.

[0006] As a preference of the present invention, the flexible film is one piece and is folded in half up and down and then adhered and connected; or the flexible film is two pieces and is adhered and connected up and down.

[0007] As a preference of the present invention, the joint of the flexible film is folded inward and then adhered and connected.

[0008] As a preference of the present invention, a reinforcing film is also adhered and connected to the outer surface of the fitting joint of the flexible film.

[0009] As a preference of the present invention, the reinforcing film includes an integrally structured middle fitting part and auxiliary fitting parts. The auxiliary fitting parts are continuous triangles with the vertices facing outwards and are connected to both sides of the middle fitting part.

[0010] Preferably, a mixing film is provided in the water cooling cavity of the flexible water cooling plate, and one side edge of the mixing film is adhesively connected to the inner surface of the flexible film.

[0011] Preferably, the mixing film includes an upper mixing film and a lower mixing film, and the upper mixing film and the lower mixing film are alternately distributed in the length extension direction of the flexible water cooling plate. The upper mixing film extends downward from the uppermost part in the water cooling cavity and inclines towards the water flow direction, and the lower mixing film extends upward from the lowermost part in the water cooling cavity and inclines towards the water flow direction.

[0012] Preferably, the nozzles at both ends of the flexible water cooling plate are respectively connected to a pump and a water tank through pipelines.

[0013] Preferably, a temperature sensor is installed on the nozzle at the water outlet of the flexible water cooling plate, and the pump speed is positively correlated with the signal of the temperature sensor.

[0014] Preferably, a flow blocking valve is connected to the nozzle at the water outlet of the flexible water cooling plate; the flow blocking valve includes a valve body, a valve core, a spring and a spring seat; the valve body is provided with a through-flow hole, and the through-flow hole is a concentric small cylindrical hole and a large cylindrical hole at the water flow inlet end and the water flow outlet end respectively, and a sealing edge is formed at the intersection of the small cylindrical hole and the large cylindrical hole; the valve core is installed in the through-flow hole, and a sealing conical surface is provided at the end towards the water flow inlet, and the sealing conical surface can be abutted against the sealing edge to form a seal. A damping hole penetrates through the axis position of the valve core, and a spring limiting groove is provided at the tail of the valve core. The spring seat is connected to the water flow outlet end of the through-flow hole, and the spring is installed between the spring limiting groove and the spring seat.

[0015] In summary, the battery structure with a flexible water cooling plate of the present invention has the following beneficial effects:

[0016] 1. After the flexible film is hermetically attached, a water cooling cavity is formed. During the operation of the battery, the water cooling cavity is in an internally pressurized state. After the flexible water cooling plate expands, it fits on the heat exchange surface of the battery module. Even if the flatness of the heat exchange surface of the battery module is poor or the heat exchange surface is not a flat surface, such as the cylindrical surface of a cylindrical battery, it can ensure good fit between the flexible water cooling plate and the battery module, and ensure that the thermal resistance of the heat conduction from the battery module to the flexible water cooling plate is basically the same.

[0017] 2. The thermal conductive adhesive is discarded, so the cost of the thermal conductive adhesive is saved, the weight of the thermal conductive adhesive is reduced, and the energy density of the battery pack is further improved. In addition, since the flexible water cooling plate is non-metallic, its weight is much lower than that of a metal water cooling plate, and the processing and transportation costs are also much lower than those of a metal water cooling plate. In this way, the energy density of the battery pack is improved and the manufacturing cost of the battery pack is reduced.

[0018] 3. To address the problem of weak strength at the flexible film fitting of the flexible water-cooled plate, a technical solution of inwards folding and fitting and fitting a reinforcing film outside the joint is adopted to ensure strength and improve the wear resistance of the side edges.

[0019] 4. A mixing film is fitted inside the flexible water-cooled plate to enable the coolant to flow up and down and mix in the water-cooling cavity, thereby making the coolant temperature of the upper and lower layers more uniform and extending the service life of the battery module.

[0020] 5. A temperature sensor and a flow restrictor valve are connected to the outlet of the flexible water-cooled plate. When the battery temperature rises, the flow rate of the coolant in the water-cooling cavity increases, the pressure also increases, the expansion effect of the flexible water-cooled plate is enhanced, the contact area with the battery module increases, and the cooling effect becomes better. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an existing aluminum alloy water-cooled plate;

[0022] Figure 2 is Figure 1 a cross-sectional view in

[0023] Figure 3 is a top view of the flexible water-cooled plate in a flattened state in the battery structure with a flexible water-cooled plate according to the present invention;

[0024] Figure 4 is a front view of the flexible water-cooled plate in a flattened state in the battery structure with a flexible water-cooled plate according to the present invention;

[0025] Figure 5 is a schematic structural diagram of an embodiment of the battery structure with a flexible water-cooled plate according to the present invention;

[0026] Figure 6 is Figure 5 a cross-sectional view in

[0027] Figure 7 is Figure 5 a schematic structural diagram of the expanded state of the flexible water-cooled plate in

[0028] Figure 8 is Figure 7 a cross-sectional view in

[0029] Figure 9 is a cross-sectional view of an embodiment of the flexible water-cooled plate in the battery structure with a flexible water-cooled plate according to the present invention;

[0030] Figure 10 is a cross-sectional view of an embodiment of the flexible water-cooled plate in the battery structure with a flexible water-cooled plate according to the present invention;

[0031] Figure 11Cross-sectional view of an embodiment of the flexible water-cooling plate in the battery structure with a flexible water-cooling plate according to the present invention;

[0032] Figure 12 is Figure 11 Cross-sectional view of the installation state of the flexible water-cooling plate in the figure;

[0033] Figure 13 Schematic structural view of the installation reinforcement film of the flexible water-cooling plate in the battery structure with a flexible water-cooling plate according to the present invention;

[0034] Figure 14 Schematic structural view of the reinforcement film of the flexible water-cooling plate in the bent state of the battery structure with a flexible water-cooling plate according to the present invention;

[0035] Figure 15 Schematic structural view of the installation mixing film of the flexible water-cooling plate in the battery structure with a flexible water-cooling plate according to the present invention;

[0036] Figure 16 Schematic structural view when the choke valve spool is closed in the battery structure with a flexible water-cooling plate according to the present invention;

[0037] Figure 17 Schematic structural view when the choke valve spool is opened in the battery structure with a flexible water-cooling plate according to the present invention;

[0038] In the figure, 1 - battery module, 2 - flexible water-cooling plate, 21 - flexible film, 22 - water-cooling cavity, 23 - water nozzle, 24 - reinforcement film, 241 - intermediate bonding part, 242 - auxiliary bonding part, 25 - mixing film, 251 - upper mixing film, 252 - lower mixing film, 3 - choke valve, 31 - valve body, 311 - flow-through hole, 3111 - sealing edge, 32 - spool, 321 - sealing conical surface, 322 - damping hole, 323 - spring limiting groove, 33 - spring, 34 - spring seat, 4 - aluminum alloy water-cooling plate. Specific embodiments

[0039] The present invention will be further described below with reference to the accompanying drawings through specific embodiments.

[0040] Such as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , the battery structure with a flexible water-cooling plate includes a plurality of battery modules 1, the battery modules 1 are arranged in multiple rows in a straight line, and further includes a flexible water-cooling plate 2 disposed between the battery modules 1, the flexible water-cooling plate 2 is arranged in the gap between adjacent linearly arranged battery modules 1; the flexible water-cooling plate 2 is formed by enclosing and bonding a long strip of flexible film 21 to form a hollow water-cooling cavity 22, and water nozzles 23 are respectively provided at both ends of the flexible water-cooling plate 2 in the length direction, and the inner holes of the water nozzles 23 are communicated with the water-cooling cavity 22.

[0041] Therefore, a battery is usually assembled from battery modules, and it is necessary to install a water-cooling plate between the battery modules to cool the battery modules. For example Figure 1 , Figure 2 , the existing water-cooling plates are usually made of aluminum alloy. However, the surface of the aluminum alloy water-cooling plate 4 is not completely flat, and there are a large number of contact gaps during the contact process with the battery module 1. There is a very large contact thermal resistance during the heat exchange between the aluminum alloy water-cooling plate 4 and the battery. It is necessary to apply a thermal conductive adhesive or other thermal conductive medium between the aluminum alloy water-cooling plate 4 and the battery module to reduce the contact thermal resistance to achieve relatively efficient heat exchange. At the place where the gap between the aluminum alloy water-cooling plate 4 and the battery module 1 is large, the thermal conductive adhesive layer will be thicker, which makes the thermal resistance of the thermal conductive adhesive itself larger, the heat transfer slow, and the battery temperature high. This will cause a large temperature difference in the battery system and a high maximum temperature, which will seriously affect the life consistency between different battery modules 1 and cause an accelerated decline in the battery system power; especially for the case where the battery module 1 is a cylindrical battery, the aluminum alloy water-cooling plate 4 is usually made into a snake shape to cool around the battery. Due to manufacturing errors and assembly errors, the snake-shaped aluminum alloy water-cooling plate 4 is in line contact with the cylindrical battery instead of surface contact between the cylindrical surface and the cylindrical surface. Even due to the flatness problem of the aluminum alloy water-cooling plate 4 along the axial plane of the cylindrical battery, it actually only contacts the cylindrical battery at some points, and the gap between the cylindrical batteries is large. Therefore, more thermal conductive adhesive needs to be poured to strengthen heat transfer. However, during the loading and use process of the battery, there will be bumps and vibrations, which will cause the thermal conductive adhesive above to sink, affecting the heat dissipation effect above the battery module 1; after changing the aluminum alloy water-cooling plate 4 to a flexible water-cooling plate 2, during operation, the water-cooling cavity 22 is in an internal pressure state. At this time, since the flexible water-cooling plate 2 is flexible, it will automatically bulge and fit on the heat exchange surface of the battery module 1. Even if the heat exchange surface of the battery module 1 has poor flatness or the heat exchange surface is not a flat surface, such as the cylindrical surface of a cylindrical battery, it can ensure good fitting between the flexible water-cooling plate 2 and the battery module 1. Because of the good fitting, the thermal resistance of the heat conduction from the battery module 1 to the flexible water-cooling plate 2 is basically the same. Thus, the technical problems of large heat exchange thermal resistance and poor uniformity caused by the poor stiffness, poor surface flatness, and non-planar heat exchange surface of the battery module 1 can be solved. At the same time, since the thermal conductive adhesive is completely abandoned, the cost of the thermal conductive adhesive is saved, and the weight of the thermal conductive adhesive is subtracted, further improving the energy density of the battery pack. In addition, since the flexible water-cooling plate 2 is non-metallic, its weight is much lower than that of the metal water-cooling plate, and the processing and transportation costs are also much lower than those of the metal water-cooling plate. In this way, the energy density of the battery pack is further improved, and the manufacturing cost of the battery pack is reduced.

[0042] For example Figure 9 , Figure 10 , Figure 11 , Figure 12, the flexible film 21 is one piece and is folded and attached up and down; or the flexible film 21 is two pieces and is attached up and down.

[0043] Thus, the water-cooling cavity 22 is formed by folding or assembling the flexible film 21. Since the splicing seam will affect the strength of the flexible water-cooling plate 2, for the case with a lower water pressure requirement, two flexible films 21 are spliced up and down, and for the case with a higher water pressure requirement, a single flexible film 21 is folded and spliced.

[0044] Embodiment 1:

[0045] As Figure 10 , Figure 11 , the joint of the flexible film 21 is folded inward and then attached.

[0046] Thus, the joint of the flexible film 21 will be under the pressure of the water pressure in the water-cooling cavity 22. If the inner sides around are attached, the inner side of the joint will be under the water pressure and there is a risk of detachment. Folding and attaching the joint of the flexible film 21 inward can make the water pressure press on the outside of the joint and strengthen the strength of the joint.

[0047] Embodiment 2:

[0048] As Figure 10 , Figure 11 , Figure 12 , a reinforcing film 23 is also attached to the outer surface of the joint of the flexible film 21.

[0049] Thus, adding the reinforcing film 23 can strengthen the connection at the joint where the flexible film 21 is attached, thereby ensuring the compressive strength of the joint. Moreover, the reinforcing film 23 is attached to the side wall of the battery compartment, which can prevent the side of the joint of the flexible film 21 from directly contacting the side wall of the battery compartment and make the side wear resistance of the flexible water-cooling plate 2 better.

[0050] Embodiment 3:

[0051] As Figure 13 , Figure 14 , the reinforcing film 24 includes an integrally structured middle attaching part 241 and auxiliary attaching parts 242. The auxiliary attaching parts 242 are continuous triangles with the apexes facing outwards and are connected to both sides of the middle attaching part 241.

[0052] Therefore, when the flexible water-cooling plate 2 is installed between cylindrical batteries, the flexible water-cooling plate 2 needs to be installed with a serpentine bend, and the reinforcing film 24 needs to be bent within its plane. The wider the width of the reinforcing film 24, the greater the internal stress in it, making the stress that needs to be overcome for the flexible water-cooling plate 2 to bend greater. Designing the reinforcing film 24 into the structure of the intermediate fitting part 241 and the auxiliary fitting part 242 enables the flexible water-cooling plate 2 to only overcome the internal stress generated by the bending of the intermediate fitting part 241 during the bending process. The auxiliary fitting part 242 can provide the compressive tensile force of the flexible film 21 on both sides of the joint, thereby achieving the effect of reducing the bending stress while ensuring the compressive tensile force.

[0053] Embodiment 4:

[0054] As Figure 15 , a mixing film 25 is provided in the water-cooling cavity 22 of the flexible water-cooling plate 2, and one side edge of the mixing film 25 is adhesively connected to the inner surface of the flexible film 21.

[0055] Therefore, when the coolant flows in the water-cooling cavity 22, the relatively hot coolant easily flows to the upper layer of the water-cooling cavity 22, resulting in a poorer cooling effect above the battery module 1 than below. By installing the mixing film 25, the coolant can be mixed and flow up and down in the water-cooling cavity 22, so that the temperatures of the coolant in the upper and lower layers are more uniform, and the service life of the battery module 1 is extended.

[0056] The mixing film 25 includes an upper mixing film 251 and a lower mixing film 252. The upper mixing film 251 and the lower mixing film 252 are alternately distributed in the length extension direction of the flexible water-cooling plate 2. The upper mixing film 251 extends downward from the uppermost part in the water-cooling cavity 22 and is inclined in the water flow direction, and the lower mixing film 252 extends upward from the lowermost part in the water-cooling cavity 22 and is inclined in the water flow direction.

[0057] Therefore, the upper mixing film 251 allows the coolant in the upper layer to enter the lower layer, and the lower mixing film 252 allows the coolant in the lower layer to enter the upper layer, so that the coolant flows alternately up and down and the temperature is more uniform. The upper mixing film 251 and the lower mixing film 252 being inclined in the water flow direction can reduce the flow resistance of the coolant.

[0058] The nozzles 23 at both ends of the flexible water-cooling plate 2 are respectively connected to a pump and a water tank through pipelines.

[0059] Therefore, the pump provides the power for the coolant to flow in the water-cooling cavity 22. The coolant flows out of the water-cooling cavity 22 and then enters the water tank. The water tank can be equipped with an air-cooling device to further cool the coolant. The coolant in the water tank is then sucked by the pump and flows to the water-cooling cavity 22 to form a cooling cycle.

[0060] A temperature sensor is installed on the nozzle 23 at the water outlet of the flexible water-cooling plate 2, and the pump speed is positively correlated with the signal of the temperature sensor.

[0061] Thus, when the temperature of the battery module 1 is relatively high, the flexible water-cooling plate 2 absorbs more heat, causing the temperature of the coolant flowing through the water nozzle 23 at the water outlet to rise. Installing a temperature sensor can obtain the temperature of the coolant in real time and feedback it to the control system to increase the pump speed, which can accelerate the coolant circulation and enhance the cooling effect. Moreover, after the pump speed increases, the pressure in the water-cooling cavity 22 increases, making the expansion effect of the flexible water-cooling plate 2 stronger and increasing the contact area with the surface of the battery module 1, further enhancing the cooling effect.

[0062] As Figure 16 , Figure 17 , a choke valve 3 is connected to the water nozzle 23 at the water outlet of the flexible water-cooling plate 2; the choke valve 3 includes a valve body 31, a valve core 32, a spring 33 and a spring seat 34; the valve body 31 is provided with a flow-through hole 311, and the flow-through hole 311 is a concentric small cylindrical hole and a large cylindrical hole at the water inlet end and the water outlet end respectively, and a sealing edge 3111 is formed at the intersection of the small cylindrical hole and the large cylindrical hole; the valve core 32 is installed in the flow-through hole 311, and a sealing conical surface 321 is provided at the end facing the water inlet, and the sealing conical surface 321 can abut against the sealing edge 3111 to form a seal. A damping hole 322 penetrates through the axis position of the valve core 32, and a spring limiting groove 323 is provided at the tail of the valve core 32. The spring seat 34 is connected to the water outlet end of the flow-through hole 311, and the spring 33 is installed between the spring limiting groove 323 and the spring seat 34.

[0063] Thus, when the battery is operating at low power, the pressure in the water-cooling cavity 22 is relatively low, and the coolant flows through the damping hole 322. When the battery power increases, the surface temperature rises, the temperature of the coolant in the water-cooling cavity 22 increases, the pressure increases, and the flow rate accelerates. When the damping hole 322 cannot meet the coolant flow rate, the pressure on the sealing conical surface 321 at the end of the valve core 32 facing the water inlet is greater than the pressure of the spring 33. Therefore, the coolant pushes the valve core 32 open, and flows through the flow-through hole 311 from the sealing edge 3111, which not only ensures the coolant flow rate in the water-cooling cavity 22 but also ensures the pressure in the water-cooling cavity 22, keeping the flexible water-cooling plate 2 expanded; the greater the coolant flow rate, the greater the back pressure exerted by the choke valve 3, that is, the greater the pressure in the water-cooling cavity 22, the better the expansion effect of the flexible water-cooling plate 2, the larger the contact area with the battery module 1, and the better the cooling effect on it.

[0064] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various variations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A battery structure with a flexible water-cooling plate, comprising a plurality of battery modules (1), wherein the battery modules (1) are arranged in multiple rows in a straight line, and it is characterized in that: It also includes a flexible water-cooling plate (2) disposed between the battery modules (1), and the flexible water-cooling plate (2) is arranged between the gaps of the adjacent linearly arranged battery modules (1); the flexible water-cooling plate (2) is formed by hermetically fitting and connecting a strip-shaped flexible film (21) to form a hollow water-cooling cavity (22). At both ends of the flexible water-cooling plate (2) in the length direction, water nozzles (23) are respectively provided, and the inner holes of the water nozzles (23) communicate with the water-cooling cavity (22). The joint of the flexible film (21) is folded inward and then hermetically connected. An additional reinforcing film (24) is also hermetically connected to the outer surface of the joint of the flexible film (21). The reinforcing film (24) includes an integrally structured middle fitting portion (241) and auxiliary fitting portions (242). The auxiliary fitting portions (242) are continuous triangles with their vertices facing outward and are connected to both sides of the middle fitting portion (241). A mixing film (25) is provided in the water-cooling cavity (22) of the flexible water-cooling plate (2), and one side edge of the mixing film (25) is hermetically connected to the inner surface of the flexible film (21). The mixing film (25) includes an upper mixing film (251) and a lower mixing film (252). The upper mixing film (251) and the lower mixing film (252) are alternately distributed in the length extension direction of the flexible water-cooling plate (2). The upper mixing film (251) extends downward from the uppermost part in the water-cooling cavity (22) and is inclined in the water flow direction. The lower mixing film (252) extends upward from the lowermost part in the water-cooling cavity (22) and is inclined in the water flow direction.

2. The battery structure with a flexible water-cooling plate according to claim 1, wherein: The flexible film (21) is one piece and is folded and hermetically connected after being folded in half vertically; or the flexible film (21) is two pieces and is hermetically connected vertically.

3. The battery structure with a flexible water-cooling plate according to claim 1, wherein: The water nozzles (23) at both ends of the flexible water-cooling plate (2) are respectively connected to a pump and a water tank through pipelines.

4. The battery structure with a flexible water-cooling plate according to claim 3, wherein: A temperature sensor is installed on the water nozzle (23) at the water outlet of the flexible water-cooling plate (2), and the rotational speed of the pump is positively correlated with the signal of the temperature sensor.

5. The battery structure with a flexible water-cooling plate according to claim 4, wherein: The water nozzle (23) at the water outlet of the flexible water-cooling plate (2) is connected to a flow control valve (3); the flow control valve (3) includes a valve body (31), a valve core (32), a spring (33), and a spring seat (34); the valve body (31) is provided with a flow-through hole (311). The flow-through hole (311) is a concentric small cylindrical hole and a large cylindrical hole at the water flow inlet end and the water flow outlet end respectively, and a sealing edge (3111) is formed at the intersection of the small cylindrical hole and the large cylindrical hole; the valve core (32) is installed in the flow-through hole (311), and a sealing conical surface (321) is provided at the end facing the water flow inlet. The sealing conical surface (321) can abut against the sealing edge (3111) to form a seal. A damping hole (322) penetrates through the axis position of the valve core (32), and a spring limiting groove (323) is provided at the tail of the valve core (32). The spring seat (34) is connected to the water flow outlet end of the flow-through hole (311), and the spring (33) is installed between the spring limiting groove (323) and the spring seat (34).

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