Liquid-cooled battery pack

Abstract

The utility model discloses a liquid-cooled battery pack, which comprises a plurality of battery units and a plurality of liquid-cooled plates, the plurality of battery units are arranged in a matrix, gaps are arranged among the plurality of battery units, the plurality of liquid-cooled plates are in one-to-one correspondence with the plurality of rows of battery units in the matrix, each liquid-cooled plate comprises a plurality of bending units, the plurality of bending units are periodically arranged along the array direction of the matrix, and the plurality of bending units are in one-to-one correspondence with the plurality of rows of battery units in the matrix. The adjacent bending units turn over in a set direction and are connected end to end, the inner wall contour of each bending unit is matched with the shape of a part of the side wall of the battery unit, a plurality of flow channels for a first cooling medium to flow are formed in each bending unit, and the flow channels in the adjacent bending units are communicated in a one-to-one correspondence manner; the plurality of bending units of each liquid cooling plate are arranged in gaps among the plurality of battery units in the same column and are propped against and connected with the side surfaces of the battery units, and the inner walls of the bending units form heat dissipation contact surfaces covering part of the side surfaces of the battery units. The liquid-cooled battery pack disclosed by the utility model is uniform in cooling effect, and the heat dissipation effect of the battery units can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery energy storage technology field, concretely relates to a liquid cooling battery pack. BACKGROUND

[0002] Battery energy storage technology has been widely concerned in recent years due to its advantages such as fast and accurate regulation. The performance of the battery is closely related to the working temperature, and the high or low temperature and the uniformity of the temperature distribution will affect the performance of the battery. Therefore, in order to ensure the safe and reliable operation of the battery, it is necessary to manage the heat of the battery. At present, the main cooling methods of the battery include air cooling, liquid cooling, phase change material cooling and heat pipe cooling. Among them, the liquid cooling method becomes a popular research direction due to its high cooling efficiency.

[0003] The liquid cooling method is mainly indirect cooling system of the cooling plate, and the cooling plate cooling system in the prior art is usually in contact with the bottom of the battery unit. Due to the anisotropy of the thermal conductivity coefficient in the battery unit, the temperature of the bottom of the battery unit is low, and the temperature of the top of the battery unit is high. The effect of the bottom cooling plate on the heat dissipation of the battery unit is poor. SUMMARY

[0004] The utility model aims at solving one of the technical problems in the related art to some extent. Therefore, the utility model provides a liquid cooling battery pack, which has uniform cooling effect and can improve the heat dissipation effect of the battery unit.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A liquid cooling battery pack includes a plurality of battery units and a plurality of liquid cooling plates. The plurality of battery units are arranged in a matrix and have gaps between them. The plurality of liquid cooling plates correspond one-to-one to the plurality of battery units in the matrix. The liquid cooling plate includes a plurality of bending units. The plurality of bending units are periodically arranged along the matrix array. Adjacent bending units are flipped in a set direction and connected end to end. The inner wall profile of the bending unit is adapted to the shape of at least part of the side wall of the battery unit. A plurality of flow channels for the flow of the first cooling medium are provided inside the bending unit, and the plurality of flow channels inside adjacent bending units are connected one by one. The plurality of bending units of each liquid cooling plate are arranged in the gaps of the plurality of battery units in the same column and in contact with at least the side surface of the battery unit. The inner wall of the bending unit forms a heat dissipation contact surface covering at least part of the side surface of the battery unit. The liquid cooling plate formed by the plurality of bending units increases the heat dissipation contact surface between the liquid cooling plate and the battery unit, improves the heat dissipation efficiency of the battery unit, reduces the temperature difference between the upper and lower cross sections of the battery unit, and improves the uniformity of the temperature distribution of the battery unit.

[0007] Optionally, the battery unit is a square battery, the bending unit is an L-shaped unit, and the bending unit at both ends of the liquid cooling plate is further provided with an extension end penetrating the end of the battery unit in the same column. By providing the square battery unit with a corresponding state bending unit, the practicability of the liquid cooling battery pack is improved.

[0008] Optionally, the battery unit is a cylindrical battery, the bending unit is an arc-shaped unit, and the bending unit at both ends of the liquid cooling plate is further provided with an extension end penetrating the end of the battery unit in the same column. By providing the cylindrical battery unit with a corresponding state bending unit, the practicability of the liquid cooling battery pack is improved.

[0009] Optionally, the liquid cooling plate includes multiple layers of sub-plates, the sub-plates include the multiple bending units, the multiple layers of sub-plates are arranged in a spaced manner along the height direction of the battery unit, the end portions of adjacent layers of sub-plates abut against each other, and the multiple extension ends on one side of the liquid cooling plate are arranged in a staggered manner along the matrix row. By providing the liquid cooling plate with a multiple-layer sub-plate structure, the liquid cooling plate is designed in a modular manner, so as to adapt to battery units of different heights.

[0010] Optionally, the upper and lower ends of each liquid cooling plate and the upper and lower ends of the battery unit in the same column have a set distance, and a support is arranged in the gap between the upper ends and / or the gap between the lower ends of adjacent battery units in the same column, so as to prevent the adjacent battery units from pressing the liquid cooling plate. By arranging the support, the adjacent battery units are prevented from pressing the liquid cooling plate.

[0011] Optionally, the multiple flow channels are arranged in a uniform manner along the vertical direction and arranged in parallel with each other in the liquid cooling plate. By arranging the multiple flow channels in a uniform manner along the vertical direction and arranging them in parallel with each other, the pipe wall of the liquid cooling plate can be thinner, the structure of the liquid cooling plate is more compact, and the conduction of heat energy is facilitated.

[0012] Optionally, the liquid cooling battery pack further includes a shell, the multiple battery units and the multiple liquid cooling plates are arranged inside the shell, and the shell is further filled with a second cooling medium for immersing the multiple battery units. By arranging the shell, the interior of the liquid cooling battery pack can be filled with the second cooling medium, the battery units are immersed and cooled, and the uniformity of the temperature distribution of the battery units is further improved.

[0013] Optionally, the liquid cooling battery further includes an inlet main pipe and an outlet main pipe, each liquid cooling plate includes an inlet manifold and an outlet manifold at both ends of the liquid cooling plate; the top end of the inlet manifold is sealed, the bottom end is in communication with the side opening of the inlet main pipe, and the side opening of the inlet manifold is in communication with the inlet of the multiple flow channels inside the liquid cooling plate; the bottom end of the outlet manifold is sealed, the top end is in communication with the side opening of the outlet main pipe, and the side opening of the outlet manifold is in communication with the outlet of the multiple flow channels inside the liquid cooling plate. By arranging the inlet main pipe, the outlet main pipe, the inlet manifold, and the outlet manifold, the liquid cooling circuit of the liquid cooling battery pack is formed, and the first cooling medium is conveniently transported.

[0014] Optionally, the inlet of the liquid inlet manifold and the outlet of the liquid outlet manifold extend from opposite ends of the housing. By extending the inlet and outlet from both ends of the housing, it is convenient to connect with external refrigeration piping and to facilitate the deployment of liquid cooling piping inside the housing, thus saving internal space.

[0015] Optionally, the housing includes side plates located around its perimeter, with a top plate and a bottom plate connected to the upper and lower sides of the side plates, respectively. The top plate is provided with an injection port for injecting a second cooling medium into the housing, and an exhaust port for venting air from inside the housing during injection. The injection port and exhaust port facilitate the injection of the second cooling medium into the housing.

[0016] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 An exploded view of a liquid-cooled battery pack provided in an embodiment of this utility model;

[0019] Figure 2 A three-dimensional structural diagram of a liquid-cooled battery pack provided for an embodiment of this utility model;

[0020] Figure 3 A three-dimensional structural diagram of a battery cell and a liquid cooling plate in an assembly state provided for an embodiment of this utility model;

[0021] Figure 4 for Figure 3 Front view;

[0022] Figure 5 A three-dimensional structural diagram of a liquid cooling plate in a layered state is provided for an embodiment of this utility model;

[0023] Figure 6 A three-dimensional structural diagram of an L-shaped bending unit provided for an embodiment of this utility model;

[0024] Figure 7 A three-dimensional structural diagram of a support member provided for an embodiment of this utility model;

[0025] Wherein, 100 - shell, 110 - side plate, 200 - battery unit, 210 - support, 300 - liquid cooling plate, 310 - bending unit, 320 - extension end, 330 - liquid inlet manifold, 340 - liquid outlet manifold, 400 - liquid inlet main pipe, 410 - liquid inlet, 500 - liquid outlet main pipe, 510 - liquid outlet. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the embodiments, it is intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] In this specification, "one embodiment" or "an embodiment" or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearance of the phrase "in one embodiment" in various places in the specification is not necessarily all referring to the same embodiment.

[0028] Embodiments:

[0029] As shown in Figure 1 and Figure 3 Embodiments of the present application provide a liquid-cooled battery pack, which can be used to store electrical energy and supply power outwardly, the liquid-cooled battery pack comprising a plurality of battery units 200 and a plurality of liquid cooling plates 300; the plurality of battery units 200 are arranged in a matrix and have gaps between the plurality of battery units 200.

[0030] Wherein, the plurality of liquid cooling plates 300 correspond one-to-one to the plurality of columns of battery units 200 in the matrix, so that each liquid cooling plate 300 is arranged between two adjacent columns of battery units 200. Figure 3 As shown in the scenario, the plurality of battery units 200 form a matrix structure of 4 columns and 13 rows, at this time the liquid-cooled battery pack comprises 4 liquid cooling plates 300, and the 4 liquid cooling plates 300 correspond one-to-one to the four columns of battery units 200.

[0031] It is worth noting that the matrix battery units 200 in the present embodiment are arranged in column direction, the plurality of battery units 200 in the same column are arranged as a battery string, and each battery unit 200 belonging to the same battery string is connected to the same cable. Therefore, the number of liquid cooling plates 300 in the present embodiment is the same as the number of matrix columns. In other embodiments, the matrix battery units 200 can also be arranged in row direction, the plurality of battery units 200 in the same row are arranged as a battery string, and the number of liquid cooling plates 300 is the same as the number of matrix rows, at this time the plurality of liquid cooling plates 300 correspond one-to-one to the plurality of rows of battery units 200 in the matrix.

[0032] In the embodiment, the liquid cooling plate 300 comprises a plurality of bending units 310, the plurality of bending units 310 are periodically arranged along a matrix array, adjacent bending units 310 are reversely turned in a set direction and connected head to tail, the inner wall contour of the bending unit 310 is at least partially adapted to the shape of the side wall of the battery cell 200, a plurality of flow channels for the first cooling medium to flow through are arranged inside the bending unit 310, and the plurality of flow channels inside adjacent bending units 310 are in one-to-one correspondence and in communication; the plurality of bending units 310 of each liquid cooling plate 300 are arranged in the gap of the battery cells 200 in the same column and abut against at least the side surface of the battery cell 200, and the inner wall of the bending unit 310 forms a heat dissipation contact surface that at least partially covers the side surface of the battery cell 200.

[0033] The set reverse turning here is related to the shape of the bending unit 310. When the bending unit 310 is in the L-shaped structure as shown in the figure, the adjacent bending units are reversely turned in opposite directions. Figure 6

[0034] The above embodiment arranges the liquid cooling plate 300 for each column of battery cells 200, and arranges the liquid cooling plate 300 to be periodically arranged by a plurality of bending units 310 along a matrix array and adjacent bending units 310 are reversely turned in a set direction and connected head to tail, so that the plurality of bending units 310 of each liquid cooling plate 300 can be arranged in the gap of the battery cells 200 in the same column, and the inner wall contour of the bending unit 310 is adapted to the shape of the side wall of the battery cell 200, so that the inner wall of the bending unit 310 forms a semi-enclosed heat dissipation contact surface. Through the semi-enclosed heat dissipation contact surface formed, not only the heat generated by the battery cell 200 can be quickly conducted into the first cooling medium, but also the temperature difference between the upper and lower cross sections of the battery cell 200 can be reduced, and the uniformity of the temperature distribution of the battery cell 200 can be improved.

[0035] In some embodiments, the battery cell 200 is arranged as a square battery, the bending unit 310 is an L-shaped unit, and the bending units 310 at both ends of the liquid cooling plate 300 are further provided with an extension end 320 that penetrates through the end of the battery cell 200 in the same column. By arranging the L-shaped bending unit 310 for the square battery cell 200, the practicability of the liquid-cooled battery pack is improved.

[0036] In the embodiment, as shown in the figure, Figure 6 ​As shown, the bending unit 310 includes vertical side plates and horizontal side plates, which form L-shaped units. The liquid cooling plate 300 formed by a plurality of L-shaped units has a tooth-shaped plate feature. The inner wall profile of the L-shaped unit is adapted to the square profile of the battery unit 200. When the bending unit 310 is inserted into the gap between the battery units 200 in the same column, the inner wall of the L-shaped unit is in contact with two adjacent sides of the battery unit 200. When the entire liquid cooling plate 300 is inserted into the gap of the battery units 200 in the same column, three sides of each battery unit 300 are in contact with the liquid cooling plate 300, and the heat dissipation contact area is larger. In addition, the bending unit 310 at both ends of the liquid cooling plate 300 is provided with an extension end 320, which facilitates connection with the liquid cooling pipeline.

[0037] In other embodiments, the battery unit 200 is provided as a cylindrical battery, the bending unit 310 is provided as an arc-shaped unit, and the bending unit 310 at both ends of the liquid cooling plate 300 is further provided with an extension end 320 extending out of the end of the battery unit 200 in the same column. By providing the cylindrical battery unit 200 with an arc-shaped bending unit 310, the practicability of the liquid-cooled battery pack is improved.

[0038] In the present embodiment, the bending unit 310 includes an arc-shaped plate, and the arc-shaped plate forms an arc-shaped unit. The liquid cooling plate 300 formed by a plurality of arc-shaped units has a wave-shaped plate feature. The inner wall profile of the arc-shaped unit is adapted to the cylindrical profile of the battery unit 200. When the bending unit 310 is inserted into the gap between the battery units 200 in the same column, the inner wall of the arc-shaped unit is in contact with the half-circumferential side of the battery unit 200. When the entire liquid cooling plate 300 is inserted into the gap of the battery units 200 in the same column, the half-circumferential side of each battery unit 300 is in contact with the liquid cooling plate 300, and the heat dissipation contact area is larger. In addition, the bending unit 310 at both ends of the liquid cooling plate 300 is provided with an extension end 320, which facilitates connection with the liquid cooling pipeline.

[0039] In some embodiments, the liquid cooling plate 300 includes a plurality of sub-plates, the sub-plates include a plurality of bending units 310, the plurality of sub-plates are arranged in the height direction of the battery unit 200, the end portions of adjacent layers of sub-plates are in contact with each other, and a plurality of extension ends 320 on one side of the liquid cooling plate 300 are arranged staggered along the matrix rows. By layering the liquid cooling plate 300, the modularization of the liquid cooling plate 300 is facilitated, so as to adapt to battery units 200 of different heights.

[0040] In some application scenarios of the present embodiment, the adjacent layers of sub-plates are flipped in opposite directions and arranged in the height direction of the battery unit 200, so as to facilitate the staggered arrangement of the plurality of extension ends 320 on one side of the liquid cooling plate 300 along the matrix rows.

[0041] As Figure 4 and 5As shown, the liquid cooling plate 300 includes two layers of sub-plates, and the upper layer of sub-plates is arranged above the lower layer of sub-plates after being flipped by 180°. In this way, the two extension ends 320 on the same side are staggered with each other, facilitating the communication with the liquid cooling pipeline.

[0042] It is worth mentioning that the attachment Figure 4 and Figure 5 are exemplary to show that each liquid cooling plate 300 includes two layers of sub-plates, and in other embodiments, more than three layers of sub-plates can be arranged, and the number of sub-plates is related to the height of the sub-plates and the height of the battery cells.

[0043] In some embodiments, a plurality of liquid channels are arranged in the liquid cooling plate 300 in a vertical direction and arranged in parallel with each other. By arranging the plurality of liquid channels in the liquid cooling plate 300 in a vertical direction and arranged in parallel with each other, the pipe wall of the liquid cooling plate 300 can be arranged to be thinner, the overall structure is more compact, and the conduction of heat energy is facilitated.

[0044] In actual application, the bending unit 310 of the liquid cooling plate 300 can adopt a micro-channel flat tube, for example, a micro-channel flat tube with a width in the range of 50mm-100mm and a thickness in the range of 2mm-5mm.

[0045] The first cooling medium is arranged in the micro-channel flat tube, and the first cooling medium usually adopts R134A (1,1,1,2-tetrafluoroethane) or R410A (new environmentally friendly refrigerant).

[0046] In some embodiments, the liquid cooling plate 300 is arranged as a copper plate or an aluminum plate, so as to facilitate rapid heat transfer and reduce the overall weight of the liquid cooling battery pack.

[0047] In some embodiments, the upper and lower ends of each liquid cooling plate 300 and the upper and lower ends of the battery cells 200 in the same column have a set distance, so that the upper and lower ends of the opposite sides of the adjacent battery cells 200 in the same column have a gap, and the set distance can be set according to experience; the upper end gap and / or the lower end gap of the adjacent battery cells 200 in the same column are provided with the support 210, so as to prevent the adjacent battery cells 200 from pressing the liquid cooling plate 300.

[0048] As shown in Figure 3 and Figure 4 , the upper end of each liquid cooling plate 300 is lower than the upper end of the battery cells 200 in the same column, and the lower end of each liquid cooling plate 300 is lower than the lower end of the battery cells 200 in the same column, so that the liquid cooling plate 300 can avoid interfering with the conductive circuit at the top plate (110) of the liquid cooling battery pack, and the support 210 can be arranged at the upper and lower ends of the side to prevent the adjacent battery cells 200 from pressing the liquid cooling plate 300.

[0049] In some embodiments, as shown in Figure 6As shown, the support 210 is provided as a support block with a hollow structure to facilitate disassembly.

[0050] In some embodiments, the support 210 is made of plastic material.

[0051] In some embodiments, as Figure 1 As shown, the liquid-cooled battery pack further includes a housing 100, the plurality of battery cells 200 and the plurality of liquid-cooled plates 300 are arranged inside the housing 100, and the housing 100 is filled with a second cooling medium that immerses the plurality of battery cells 200.

[0052] The second cooling medium is provided as one of fluorinated liquid, silicone oil, and mineral oil. The fluorinated liquid, silicone oil, and mineral oil have high specific heat capacity and heat transfer coefficient, and can more effectively take away the heat generated by the battery cells 200 compared with commonly used cooling media such as air or water. In addition, the fluorinated liquid, silicone oil, and mineral oil have high dielectric strength and dielectric constant, and can better protect the battery cells 200 from the risk of electric shock or short circuit compared with cooling media with strong conductivity such as water, thereby improving the safety of the liquid-cooled battery module.

[0053] In this way, by combining the side plate cooling and immersion cooling two liquid cooling methods, the heat generated by the battery cells 200 can be quickly conducted to the outside of the housing 100, reducing the temperature difference between different regions of the battery cells 200, and making the temperature distribution of the battery cells 200 more uniform and stable.

[0054] In some embodiments, the housing 100 includes side plates 120 located around the periphery, and the upper and lower sides of the side plates 120 are respectively connected to a top plate 110 and a bottom plate. The top plate 110 is provided with a liquid injection port for injecting the second cooling medium into the housing 100, and an air outlet for discharging air inside the housing 100 during liquid injection. By providing the liquid injection port and the air outlet, it is convenient to inject the second cooling medium into the housing 100. The liquid injection port provided on the top plate 110 facilitates the liquid injection operation, and the air outlet provided on the top plate 110 ensures that the liquid injection operation proceeds smoothly by discharging air inside the liquid-cooled battery pack while injecting the liquid.

[0055] In some application scenarios, the side plates 120, the bottom plate, and the top plate are all single structures, and the connection between the side plates 120 and the top plate 110 and the connection between the side plates 120 and the bottom plate are both provided with sealing rings, and the side plates 120 and the top plate 110 and the side plates 120 and the bottom plate are all fixedly connected by threads. By providing sealing rings at the connection, the inside of the housing 100 is sealed.

[0056] In other application scenarios, the side plate 120 and the bottom plate are set as an integral connection structure, and the side plate 120 and the top plate 110 are connected by threads. A sealing ring is set at the connection between the side plate 120 and the top plate 110 to reduce the use of connecting parts and increase the sealing performance of the housing 100, so as to prevent the leakage of the second cooling medium inside the housing 100.

[0057] In some embodiments, the immersion position of the second cooling medium is set 10mm-30mm above the battery tabs of the battery cell 200, and the second cooling medium does not contact the top plate 110. By immersing the battery tabs, the stability under operating conditions is improved, and interference of the second cooling medium with the conductive lines at the top plate 110 is avoided.

[0058] In some embodiments, such as Figure 2 As shown, the liquid-cooled battery also includes an inlet manifold 400 and an outlet manifold 500. Each liquid-cooled plate 300 includes an inlet manifold 330 and an outlet manifold 340 located at both ends of the liquid-cooled plate 300. The top end of the inlet manifold 330 is sealed, and the bottom end is connected to the side opening of the inlet manifold 400. The side opening of the inlet manifold 330 is connected to the inlet of multiple flow channels inside the liquid-cooled plate 300. The bottom end of the outlet manifold 340 is sealed, and the top end is connected to the side opening of the outlet manifold 500. The side opening of the outlet manifold 340 is connected to the outlet of multiple flow channels inside the liquid-cooled plate 300. The liquid cooling pipeline of the liquid-cooled battery pack is formed by the inlet and outlet liquid main pipe 400, the inlet manifold 330, multiple flow channels inside the liquid cooling plate 300, the outlet manifold 340 and the outlet main pipe 500. The liquid cooling pipeline allows the first cooling medium to circulate with the outside, and quickly conducts the heat generated by the battery unit 200 to the outside of the housing 100.

[0059] In some embodiments, the liquid inlet manifold 400 and the liquid outlet manifold 500 are disposed at both ends inside the housing 100 along the width direction, wherein the liquid inlet manifold 400 is disposed near the bottom plate and the liquid outlet manifold 500 is disposed near the top plate 110, so as to facilitate the deployment of liquid cooling pipelines and save internal space.

[0060] In some embodiments, the inlet 410 of the liquid inlet manifold 400 and the outlet 510 of the liquid outlet manifold 500 extend from opposite ends of the housing 100. By allowing the inlet 410 and outlet 510 to extend from both ends of the housing 100, it is convenient to communicate with external refrigeration pipelines and also convenient to deploy liquid cooling pipelines inside the housing 100, saving internal space.

[0061] In actual application, to avoid liquid leakage of the liquid cooling pipeline, sealing rings are arranged at positions where the liquid inlet main pipe 400 and the liquid outlet main pipe 500 pass through the side plate 120, and the outlets of the plurality of flow channels of the liquid cooling plate 300 are welded and sealed with the side openings of the liquid outlet manifold 340, the inlets of the plurality of flow channels are welded and sealed with the side openings of the liquid inlet manifold 330, the bottom circular hole of the liquid inlet manifold 330 is welded and sealed with the side opening of the liquid inlet main pipe 400, and the top circular hole of the liquid outlet manifold 340 is welded and sealed with the side opening of the liquid outlet main pipe 500.

[0062] In some embodiments, the liquid inlet 410 and the liquid outlet 510 are both in communication with the pipeline of the refrigeration device outside the liquid cooling battery pack. The refrigeration device outside the liquid cooling battery pack is communicated through the liquid inlet 410 and the liquid outlet 510, so that the refrigeration device can input the cooling medium into the plurality of liquid channels of the liquid cooling plate 300, and the refrigeration device can cool the battery cell 200.

[0063] In some embodiments, the first cooling medium is set as the refrigerant of the refrigeration device. The refrigeration device comprises a refrigerant control valve and a temperature sensor, etc. The liquid inlet 410 is connected to the refrigerant control valve and then connected to the inlet pipeline of the refrigeration device, and the temperature sensor is arranged at the inlet pipeline. The refrigeration device controls the refrigerant control valve in combination with the sensed temperature of the temperature sensor. The refrigerant provided by the external refrigeration device absorbs the heat generated by the battery cell 200 and quickly exchanges the heat to the outside of the shell 100, thereby improving the heat dissipation efficiency of the battery cell 200.

[0064] It is worth noting that each liquid cooling battery pack in the embodiment can be separately configured with an external refrigeration device, or a plurality of liquid cooling battery packs can share an external refrigeration device. Those skilled in the art can flexibly set the matching mode of the liquid cooling battery pack and the external refrigeration device according to the application requirements.

[0065] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the above specific implementation manner and the drawings. Any modification that does not deviate from the functional and structural principles of the present application shall be included in the scope of the claims.

Claims

1. A liquid-cooled battery pack, comprising a plurality of battery cells (200) and a plurality of liquid cooling plates (300), wherein the plurality of battery cells (200) are arranged in a matrix with gaps between them, and the plurality of liquid cooling plates (300) correspond one-to-one with multiple columns of battery cells (200) in the matrix, characterized in that, The liquid cooling plate (300) includes multiple bending units (310), which are periodically arranged along the matrix column direction. Adjacent bending units (310) are flipped in a set direction and connected end to end. The inner wall contour of the bending unit (310) is adapted to at least part of the side wall shape of the battery unit (200). Multiple flow channels for the first cooling medium are provided inside the bending unit (310), and the multiple flow channels inside adjacent bending units (310) are connected one-to-one. Multiple bending units (310) of each liquid cooling plate (300) are disposed in the gaps between multiple battery cells (200) in the same row and abut against at least one side of the battery cell (200). The inner wall of the bending unit (310) forms a heat dissipation contact surface covering at least part of the side of the battery cell (200).

2. The liquid-cooled battery pack according to claim 1, characterized in that, The battery cell (200) is configured as a square battery, the bending unit (310) is an L-shaped unit, and the bending unit (310) located at both ends of the liquid cooling plate (300) is also provided with an extension end (320) extending out of the end of the battery cell (200) in the same row.

3. The liquid-cooled battery pack according to claim 1, characterized in that, The battery cell (200) is configured as a cylindrical battery, the bending unit (310) is an arc-shaped unit, and the bending unit (310) located at both ends of the liquid cooling plate (300) is also provided with an extension end (320) extending out of the end of the battery cell (200) in the same row.

4. The liquid-cooled battery pack according to claim 2 or 3, characterized in that, The liquid cooling plate (300) includes multiple sub-plates, each sub-plate including the plurality of bending units (310). The multiple sub-plates are spaced apart along the height direction of the battery cell (200), with the ends of adjacent sub-plates abutting each other. The plurality of extended ends on one side of the liquid cooling plate (300) are staggered along the matrix row direction.

5. The liquid-cooled battery pack according to claim 1, characterized in that... Each liquid cooling plate (300) has a set distance between its upper and lower ends and the upper and lower ends of the battery cells (200) in the same row. Support members (210) are provided in the upper and / or lower gaps of adjacent battery cells (200) in the same row to prevent adjacent battery cells (200) from squeezing the liquid cooling plate (300).

6. The liquid-cooled battery pack according to claim 1, characterized in that, The multiple flow channels are evenly arranged vertically and parallel to each other within the liquid cooling plate (300).

7. The liquid-cooled battery pack according to claim 1, characterized in that, The liquid-cooled battery pack also includes a housing (100), a plurality of battery cells (200) and a plurality of liquid cooling plates (300) disposed inside the housing (100), and a second cooling medium immersing the plurality of battery cells (200) is also filled inside the housing (100).

8. The liquid-cooled battery pack according to claim 7, characterized in that, The liquid-cooled battery also includes an inlet manifold (400) and an outlet manifold (500), and each liquid-cooled plate (300) includes an inlet manifold (330) and an outlet manifold (340) located at both ends of the liquid-cooled plate (300); The top end of the liquid inlet manifold (330) is sealed, and the bottom end is connected to the side opening of the liquid inlet main pipe (400). The side opening of the liquid inlet manifold (330) is connected to the inlet of multiple flow channels inside the liquid cooling plate (300). The bottom end of the liquid outlet manifold (340) is sealed, and the top end is connected to the side opening of the liquid outlet main pipe (500). The side opening of the liquid outlet manifold (340) is connected to the outlet of multiple flow channels inside the liquid cooling plate (300).

9. The liquid-cooled battery pack according to claim 8, characterized in that... The inlet (410) of the inlet manifold (400) and the outlet (510) of the outlet manifold (500) extend from opposite ends of the housing (100).

10. The liquid-cooled battery pack according to claim 7, characterized in that... The housing (100) includes side plates (120) located around the perimeter. The upper and lower sides of the side plates (120) are respectively connected to a top plate (110) and a bottom plate. The top plate (110) is provided with an injection port for injecting a second cooling medium into the housing (100) and an exhaust port for discharging air from inside the housing (100) during injection.

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