Liquid cooling device and energy storage system

Abstract

The utility model provides a liquid cooling device and an energy storage system, the liquid cooling device comprises a main body part and an accommodating part, the main body part is internally provided with an accommodating cavity, and the main body part is provided with a liquid inlet and a liquid outlet; the accommodating part is cylindrical, the accommodating part is used for accommodating a battery cell, at least part of the accommodating part is accommodated in the accommodating cavity, and an opening in at least one end of the accommodating part is communicated with the outside; the cavity wall of the containing cavity and the containing part are enclosed to form a sealing channel for a cooling medium to circulate, the liquid inlet and the liquid outlet are respectively communicated with the sealing channel, and the cooling medium flows in from the liquid inlet, flows through the sealing channel and then flows out from the liquid outlet. According to the utility model, the cooling medium flows through the outer side wall of the accommodating part to take away the heat of the battery cell in the accommodating part, the contact area of the circulating cooling medium and the accommodating part is large, the heat dissipation efficiency is high, the temperature of the battery cell can be effectively reduced, the battery cell is not easy to degrade, and the stability of the performance of the battery cell is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a liquid cooling device and an energy storage system. Background Art

[0002] In the related art, the DC energy storage system is limited by the size of the server cabinet and mostly adopts a 2U structure, and each DC energy storage module is composed of 6 DC energy storage units. Among them, a single DC energy storage unit is equipped with a fan with a diameter of 40mm or 60mm and a thickness of 25mm for forced air cooling. However, a single DC energy storage unit still has a thermal cascade phenomenon, which causes the battery cell temperature to be too high, causing the degradation rate to accelerate. At this time, the internal resistance will further increase. The internal resistance and temperature rise form a pair of negative feedback, which accelerates the degradation of high-resistance batteries. The internal resistance of batteries with a deep degree of aging is relatively large, and the capacity attenuation is also greater, resulting in large differences in battery cell performance. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a liquid cooling device and an energy storage system to solve the technical problem of excessively high battery core temperature existing in the prior art.

[0004] To achieve the above objectives, in a first aspect, the utility model provides a liquid cooling device, comprising:

[0005] A main body having a receiving cavity therein and a liquid inlet and a liquid outlet provided on the main body; and

[0006] The accommodating portion is in a cylindrical shape and is used to accommodate the battery core. At least a portion of the accommodating portion is accommodated in the accommodating cavity, and an opening at at least one end of the accommodating portion is in communication with the outside;

[0007] The cavity wall of the accommodating cavity and the accommodating portion enclose a sealed channel for the circulation of cooling medium. The liquid inlet and the liquid outlet are respectively connected to the sealed channel. The cooling medium flows in from the liquid inlet, flows through the sealed channel, and then flows out from the liquid outlet.

[0008] In one of the embodiments, at least one partition is further included, and at least one partition is disposed in the accommodating cavity and is used to divide the sealed channel into a plurality of sub-channels for the circulation of cooling medium.

[0009] In one embodiment, the plurality of sub-channels are isolated from each other; or, the plurality of sub-channels are connected in sequence; or, a part of the sub-channels are isolated from each other, and another part of the sub-channels are connected in sequence.

[0010] In one embodiment, the main body is formed by bending and welding a plate; and / or the accommodating portion is connected to the main body by welding; and / or the partition is connected to the main body and the accommodating portion respectively by welding.

[0011] In one embodiment, the end face where the opening of the accommodating portion communicating with the outside world is located is flush with the cavity wall of the accommodating cavity; or, the end face where the opening of the accommodating portion communicating with the outside world is located is flush with the outer side wall of the main body; or, the end face where the opening of the accommodating portion communicating with the outside world is located protrudes from the outer side wall of the main body.

[0012] In one embodiment, the wall thickness of the accommodating portion is 0.2 mm to 0.4 mm; and / or the wall thickness of the main body portion is 0.2 mm to 0.4 mm.

[0013] In one embodiment, the accommodating portions are provided in plurality, the cross-sections of the plurality of accommodating portions are circular and / or square, and the inner side wall of each accommodating portion is in contact with the outer side wall of the corresponding battery core.

[0014] In one embodiment, the main body includes a first side panel and a second side panel that are arranged opposite to each other, and both ends of the accommodating portion are respectively connected to the first side panel and the second side panel, and the first side panel and the second side panel are both provided with through holes for exposing the opening of the accommodating portion.

[0015] In one embodiment, the main body also includes a first end plate and a second end plate arranged opposite to each other, the first end plate, the first side plate, the second end plate and the second side plate are connected end to end, and the first end plate and / or the second end plate are provided with the liquid inlet and the liquid outlet.

[0016] In one of the embodiments, the liquid cooling device further comprises a quick-release joint, wherein the quick-release joint is used to connect the liquid inlet with the liquid inlet pipe, and the quick-release joint is also used to connect the liquid outlet with the liquid outlet pipe.

[0017] In a second aspect, the utility model further provides an energy storage system, comprising:

[0018] shell;

[0019] A circuit board is arranged in the housing;

[0020] The liquid cooling device as described above is arranged in the housing; and

[0021] The battery core is accommodated in the accommodation portion, and the battery core is electrically connected to the circuit board.

[0022] The beneficial effect of the liquid cooling device provided by the utility model is that compared with the related art, the liquid cooling device of the utility model includes a main body and a accommodating part, the accommodating part is cylindrical, at least part of the accommodating part is accommodated in the accommodating cavity, and the opening of at least one end of the accommodating part is connected to the outside world. In this way, the battery cell can be accommodated in the accommodating part through the opening of the accommodating part connected to the outside world. The cavity wall of the accommodating cavity and the accommodating part are surrounded to form a sealed channel for the circulation of cooling medium. The cooling medium flows in from the liquid inlet on the main body, and flows out from the liquid outlet after passing through the sealed channel. At this time, the cooling medium flows through the outer wall of the accommodating part to take away the heat of the battery cell in the accommodating part. The contact area between the circulating cooling medium and the accommodating part is large, and its heat dissipation efficiency is high, which can effectively reduce the temperature of the battery cell, making the battery cell less likely to deteriorate, thereby improving the stability of the battery cell performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the three-dimensional structure of a liquid cooling device provided in one embodiment of the utility model;

[0025] Figure 2 A schematic side view of the structure of a liquid cooling device provided by an embodiment of the utility model;

[0026] Figure 3 for Figure 2 A magnified image of area A;

[0027] Figure 4 A schematic diagram of the top view of the structure of a liquid cooling device provided as an example of the utility model;

[0028] Figure 5 A schematic diagram of a top view of a liquid cooling device provided as another example of the utility model;

[0029] Figure 6 A schematic diagram of a top view of a liquid cooling device provided as another example of the utility model;

[0030] Figure 7 A schematic diagram of the top view of the structure of a liquid cooling device provided as another example of the utility model;

[0031] Figure 8 A schematic top view of the structure of a liquid cooling device provided as yet another example of the present utility model;

[0032] Fig. 9A schematic diagram of the three-dimensional structure of an energy storage system provided by an embodiment of the utility model;

[0033] Fig.10 A schematic diagram of the explosion structure of an energy storage system provided in one embodiment of the utility model.

[0034] Among them, the reference numerals in the figure are:

[0035] 100-energy storage system; 10-liquid cooling device; 11-main body; 101-sealed channel; 110-through hole; 111-first side plate; 112-second side plate; 113-first end plate; 114-second end plate; 115-third side plate; 116-fourth side plate; 12-accommodating portion; 13-partition; 14-quick-release connector; 20-battery cell; 30-housing; 31-upper shell; 32-lower shell; 40-circuit board; 50-insulating paper; 60-copper busbar. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] Please also read Figure 1 , Figure 4 and Fig.10 , the liquid cooling device 10 provided by the embodiment of the utility model is now described. The liquid cooling device 10 includes a main body 11 and a receiving portion 12. Among them, the main body 11 has a receiving cavity, and a liquid inlet and a liquid outlet are opened on the main body 11. The liquid inlet is used for the cooling medium to flow in, and the liquid outlet is used for the cooling medium to flow out, thereby forming a circulating cooling medium in the receiving cavity. The receiving portion 12 is cylindrical, and has an opening at one end or both ends. The battery cell 20 can be inserted into the receiving portion 12 along the axial direction through the opening to achieve the battery cell 20 being accommodated in the receiving portion 12. At least part of the receiving portion 12 is accommodated in the receiving cavity, so that at least part of the receiving portion 12 can be immersed in the circulating cooling medium, thereby achieving the cooling of the battery cell 12 in the receiving portion 12. The opening at at least one end of the receiving portion 12 is connected to the outside world, so that the battery cell 20 can be inserted into the receiving portion 12.

[0041] The cavity wall of the accommodating cavity and the accommodating portion 12 enclose a sealed channel 101 for the circulation of cooling medium. The sealed channel 101 is connected to the liquid inlet and the liquid outlet respectively. The cooling medium flows into the liquid inlet, flows through the sealed channel 101, and then flows out from the liquid outlet. At this time, a circulating cooling medium is formed in the sealed channel 101, so that the accommodating portion 12 is immersed in the circulating cooling medium. It can be understood that the circulating cooling medium has a better cooling effect than the static cooling medium; and as the contact area between the accommodating portion 12 and the circulating cooling medium increases, the cooling efficiency will also increase accordingly.

[0042] In a specific implementation, the cooling medium includes but is not limited to a coolant or an ethylene glycol aqueous solution. The number of the accommodating portions 12 is selected according to the number of the battery cells 20 , and one accommodating portion 12 can accommodate one battery cell 20 .

[0043] Compared with the related art, the liquid cooling device provided by the embodiment of the utility model includes a main body 11 and a accommodating portion 12. The accommodating portion 12 is cylindrical, and at least a part of the accommodating portion 12 is accommodated in the accommodating cavity. The opening of at least one end of the accommodating portion 12 is connected to the outside. In this way, the battery cell 20 can be accommodated in the accommodating portion 12 through the opening of the accommodating portion 12 connected to the outside. The cavity wall of the accommodating cavity and the accommodating portion 12 are surrounded to form a sealed channel 101 for the circulation of cooling medium. The cooling medium flows in from the liquid inlet on the main body 11, flows through the sealed channel 101 and then flows out from the liquid outlet. At this time, the cooling medium flows through the outer wall of the accommodating portion 12 to take away the heat of the battery cell 20 in the accommodating portion 12. The contact area between the circulating cooling medium and the accommodating portion 12 is large, and the heat dissipation efficiency is high, which can effectively reduce the temperature of the battery cell 20, so that the battery cell 20 is not easy to deteriorate, thereby improving the stability of the performance of the battery cell 20.

[0044] In addition, since the liquid cooling device 10 of the embodiment of the utility model is used instead of the traditional air cooling, the space originally belonging to the fan can be used within the same volume, so that the number of battery cells 20 is increased, thereby improving the volume capacity ratio. In a specific implementation, the current 67 ternary 18650 battery cells 20 of a single DC energy storage unit can be increased to 78 ternary 18650 battery cells 20; at the same time, the fanless design of the liquid cooling device 10 of the embodiment of the utility model can effectively reduce noise.

[0045] In one embodiment, only a portion of the accommodating portion 12 is accommodated in the accommodating cavity. In one embodiment, the accommodating portion 12 is partially accommodated in the accommodating cavity along the axial direction. In this case, one end of the accommodating portion 12 has an opening, while the other end is closed, and the closed end of the accommodating portion 12 is accommodated in the accommodating cavity, while the end of the accommodating portion 12 with an opening is connected to the outside. In another embodiment, the accommodating portion 12 is partially accommodated in the accommodating cavity along the radial direction. In this case, at least one end of the accommodating portion 12 has an opening connected to the outside.

[0046] Preferably, in order to increase the contact area between the accommodating portion 12 and the circulating cooling medium, the accommodating portion 12 is entirely accommodated in the accommodating cavity, and at this time, the two ends of the accommodating portion 12 are respectively connected to the main body 11. In one embodiment, the opening at one end of the accommodating portion 12 is connected to the outside, and the other end of the accommodating portion 12 is in a closed state, which may have an opening and be connected to the inner wall of the accommodating cavity, or may be a closed end and connected to the inner wall of the accommodating cavity. In another embodiment, both ends of the accommodating portion 12 have openings, and the openings at both ends are connected to the outside.

[0047] In one embodiment, the end surface where the opening of the accommodating portion 12 is connected to the outside is flush with the cavity wall of the accommodating cavity, and in this case, a through hole 110 corresponding to the opening of the accommodating portion 12 is opened on the main body 11 to expose the opening of the accommodating portion 12 to the outside. In another embodiment, the end surface where the opening of the accommodating portion 12 is connected to the outside is flush with the outer side wall of the main body, and in this case, a through hole 110 is opened on the main body 11 for the accommodating portion 12 to pass through. In yet another embodiment, the end surface where the opening of the accommodating portion 12 is connected to the outside is protruding from the outer side wall of the main body, and in this case, a through hole 110 is opened on the main body 11 for the accommodating portion 12 to pass through.

[0048] Preferably, the axial length of the battery cell 20 is equal to the axial length of the accommodation portion 12 to prevent the protruding battery cell 20 or the protruding accommodation portion 12 from causing low heat dissipation efficiency of the battery cell 20 or waste of resources of the liquid cooling device 10 .

[0049] In one embodiment, please refer to Figures 1 to 4The main body 11 is roughly in the shape of a rectangular parallelepiped, and includes a first side plate 111 and a second side plate 112 arranged oppositely. The two ends of the accommodating portion 12 are respectively connected to the first side plate 111 and the second side plate 112. The first side plate 111 and the second side plate 112 are both provided with through holes 110 for exposing the opening of the accommodating portion 12. In this embodiment, since the battery cell 20 is columnar, the first side plate 111 and the second side plate 112 are arranged oppositely, which can simplify the structure of the main body 11 and make the overall structure of the liquid cooling device 10 more compact.

[0050] In this embodiment, the main body 11 further includes a first end plate 113 and a second end plate 114 which are arranged opposite to each other. The first end plate 113, the first side plate 111, the second end plate 114 and the second side plate 112 are connected end to end, and the above-mentioned liquid inlet and liquid outlet are provided on the first end plate 113 and / or the second end plate 114. The liquid inlet and liquid outlet are provided on the first end plate 113 and / or the second end plate 114, so that the cooling medium has a longer travel distance, which can improve the heat dissipation efficiency of the cooling medium.

[0051] In this embodiment, the main body 11 further includes a third side plate 115 and a fourth side plate 116 which are arranged opposite to each other, wherein the first side plate 111, the third side plate 115, the second side plate 112 and the fourth side plate 116 are connected end to end. The first side plate 111, the second side plate 112, the third side plate 115, the fourth side plate 116, the first end plate 113 and the second end plate 114 are enclosed together to form the above-mentioned accommodation cavity.

[0052] In one embodiment, the liquid cooling device 10 further includes at least one partition 13, which is disposed in the accommodating cavity and is used to divide the sealed channel 101 into a plurality of sub-channels for the cooling medium to flow through. In this embodiment, the sealed channel 101 is divided into a plurality of sub-channels by the partition 13, so that the heat dissipation efficiency of the cooling medium can be improved.

[0053] In one embodiment, the multiple sub-channels are isolated from each other, that is, the multiple sub-channels are independent channels. In this case, each sub-channel has a corresponding liquid inlet and liquid outlet.

[0054] In another embodiment, the multiple sub-channels are connected in sequence, that is, the cooling medium flows through each sub-channel in sequence. At this time, one end of the multiple sub-channels is connected to the liquid inlet, and the other end is connected to the liquid outlet.

[0055] In another embodiment, a part of the sub-channels are isolated from each other, and another part of the sub-channels are connected in sequence, wherein, in the sub-channels isolated from each other, each sub-channel has a corresponding liquid inlet and liquid outlet, and in the sub-channels connected in sequence, one end of the channel is connected to the liquid inlet, and the other end of the channel is connected to the liquid outlet.

[0056] In one example, see Figure 4 , a partition 13 is provided, and one partition 13 is longitudinally provided in the accommodating cavity. The partition 13 is located between the first side plate 111 and the second side plate 112. At this time, a first sub-channel for the circulation of the cooling medium is formed in the sealed channel 101 and between the first side plate 111 and the partition 13, and a second sub-channel for the circulation of the cooling medium is formed between the second side plate 112 and the partition 13. In this example, the partition 13 is parallel to the first side plate 111 and the second side plate 112, respectively, so as to divide the sealed channel in the accommodating cavity into the first sub-channel and the second sub-channel.

[0057] In this example, a liquid inlet and a liquid outlet are provided on the first end plate 113 of the main body 11, that is, the liquid inlet and the liquid outlet are located at the same end of the main body 11, the liquid inlet is connected to the first sub-channel, the liquid outlet is connected to the second sub-channel, and the first sub-channel and the second sub-channel are connected to each other at one end of the main body 11 away from the liquid inlet and the liquid outlet, and the cooling medium flows into the first sub-channel in parallel through the liquid inlet, bypasses the partition 13, and flows out of the second sub-channel to the liquid outlet in parallel. Among them, the liquid inlet and the liquid outlet are located at the same end of the main body 11, which is convenient for the arrangement of the liquid inlet and liquid outlet pipes, making the overall structure of the liquid cooling device 10 more compact.

[0058] In a specific implementation, the length of the partition 13 along the flow direction of the cooling medium is smaller than the length of the first side plate 111 and the second side plate 112 along the flow direction of the cooling medium, that is, one end of the partition 13 is connected to the inner wall of the main body 11, and there is a gap between the other end and the inner wall of the main body 11 for the cooling medium to flow.

[0059] Preferably, the distance between the partition 13 and the first side plate 111 is equal to the distance between it and the second side plate 112, that is, the width of the first sub-channel in a direction perpendicular to the partition 13 is equal to the width of the second sub-channel, and the distance between the partition 13 and the inner wall of the main body 11 is equal to the width of the first sub-channel in a direction perpendicular to the partition 13. This arrangement allows the cooling medium to flow at a uniform speed in the channel, thereby balancing the temperature of the battery cells.

[0060] In another example, one partition 13 is provided, and one partition 13 is transversely provided in the accommodating cavity, and one partition 13 is provided between the third side plate 115 and the fourth side plate 116. In this case, a third sub-channel for the circulation of the cooling medium is formed in the accommodating cavity and between the third side plate 115 and the partition 13, and a fourth sub-channel for the circulation of the cooling medium is formed between the fourth side plate 116 and the partition 13. In this example, the partition 13 is parallel to the third side plate 115 and the fourth side plate 116, respectively, so as to divide the sealing channel 101 into the third sub-channel and the fourth sub-channel.

[0061] In another example, see Figure 5, the partition 13 is set as one, and the length of the partition 13 is equal to the length of the first side plate 111 and the second side plate 112, that is, the two ends of the partition 13 are respectively connected to the cavity wall of the accommodating cavity, such as the two ends of the partition 13 are respectively connected to the first end plate 113 and the second end plate 114, so that the sealing channel 101 is divided into a first sub-channel and a second sub-channel that are independent of each other.

[0062] In this example, a liquid inlet and a liquid outlet are provided on both the first end plate 113 and the second end plate 114. The liquid inlet of the first end plate 113 is connected to the first sub-channel, the liquid outlet of the first end plate 113 is connected to the second sub-channel, the liquid inlet of the second end plate 114 is connected to the second sub-channel, and the liquid outlet of the second end plate 114 is connected to the first sub-channel. The cooling medium flows in parallel and in opposite directions in the first sub-channel and the second sub-channel, so as to balance the temperature of the battery cells.

[0063] In another example, see Figure 6 , one partition 13 is provided, and one partition 13 divides the sealed channel 101 into a first sub-channel and a second sub-channel that are independent of each other. In this example, the first end plate 113 has two liquid inlets, the second end plate 114 has two liquid outlets, one end of the first sub-channel is connected to one of the liquid inlets, the other end of the first sub-channel is connected to one of the liquid outlets, one end of the second sub-channel is connected to the other liquid inlet, and the other end of the second sub-channel is connected to the other liquid outlet, and the cooling medium flows in parallel and in the same direction in the first sub-channel and the second sub-channel.

[0064] In another example, see Figure 7 , two partitions 13 are provided, one end of one partition 13 is connected to the first end plate 113, and a gap is formed between the other end and the second end plate 114; one end of the other partition 13 is connected to the second end plate 114, and a gap is formed between the other end and the first end plate 113. In this way, the two partitions 13 divide the sealed channel 101 into three sub-channels, and the three sub-channels are connected in sequence. Preferably, the widths of the three sub-channels are the same, so that the cooling medium flows in the sub-channels at a uniform speed, thereby balancing the temperature of the battery cells.

[0065] In yet another example, see Figure 8 , two partitions 13 are provided, one end of the two partitions 13 is connected to the first end plate 113, and the other end of the two partitions 13 is connected to the second end plate 114. In this way, the two partitions 13 divide the sealed channel 101 into three sub-channels, and the three sub-channels are independent of each other. Among them, the cooling medium in two adjacent sub-channels flows in opposite directions, which can balance the temperature of the battery core.

[0066] In one embodiment, the main body 11 is formed by bending and welding a plate, wherein the plate can be formed by heat treatment of copper, aluminum or alloy; and / or, the accommodating portion 12 is connected to the main body 11 by welding; and / or, the partition 13 is connected to the main body 11 and the accommodating portion 12 by welding. In this embodiment, the welding process can ensure the sealing performance of the sealing channel 101. In a specific implementation, the sealing channel 101 can be sealed by a welding process such as stir friction welding or brazing.

[0067] In one embodiment, the wall thickness of the main body 11 is 0.2 mm to 0.4 mm, so as to ensure that the main body 11 has sufficient strength and the space of the internal accommodating cavity is large enough, so that more accommodating parts 12 can be accommodated in the same volume, and the number of corresponding battery cells 20 is also increased, thereby improving the volume energy density; at the same time, when the accommodating space is large, the cooling medium will flow more smoothly, thereby improving the heat dissipation efficiency of the cooling medium. In a specific implementation, the wall thickness of the main body 11 can be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm or 0.4 mm, etc.

[0068] In one embodiment, the wall thickness of the accommodating portion 12 is 0.2 mm to 0.4 mm, so as to ensure that the accommodating portion 12 has the strength required to accommodate the battery cell 13 and the distance between the outer wall of the battery cell 13 and the circulating cooling medium is smaller, thereby improving the heat dissipation efficiency of the cooling medium. In a specific implementation, the wall thickness of the accommodating portion 12 can be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm or 0.4 mm, etc.

[0069] In one embodiment, please refer to Figure 1 , Figure 2 and Fig.10 , the accommodating portion 12 is provided in plurality, and the cross section of the accommodating portion 12 is circular, that is, the accommodating portion 12 is cylindrical, and the sealing channel 101 presents a plurality of continuously extending transverse S-shaped channels and a plurality of longitudinal S-shaped channels, wherein the plurality of transverse S-shaped channels are arranged along the flow direction of the cooling medium, and the plurality of longitudinal S-shaped channels are arranged along the flow direction perpendicular to the cooling medium, that is, the transverse S-shaped channels are perpendicular to the longitudinal S-shaped channels. Figure 2 In the figure, multiple transverse S-shaped channels are continuously extended and arranged along the flow direction of the cooling medium. In this embodiment, the liquid cooling device 10 is used to accommodate the cylindrical battery cell 20, and the sealed channel 101 for the circulation of the cooling medium presents multiple continuous transverse and longitudinal small S-shaped cooling paths, which can improve the heat exchange efficiency.

[0070] In another embodiment, the accommodating portion 12 is provided in plurality, and the cross section of the accommodating portion 12 is square, that is, the accommodating portion 12 is in the shape of a square tube, and the sealing channel 101 presents a plurality of continuously extending transverse U-shaped channels and a plurality of longitudinal U-shaped channels, wherein the plurality of transverse U-shaped channels are arranged along the flow direction of the cooling medium, and the plurality of longitudinal U-shaped channels are arranged along the flow direction perpendicular to the cooling medium, that is, the transverse U-shaped channels are perpendicular to the longitudinal U-shaped channels. In this embodiment, the liquid cooling device 10 is used to accommodate a square battery cell 20, such as a blade battery, and the sealing channel 101 for the circulation of the cooling medium presents a plurality of continuous transverse and longitudinal small U-shaped cooling paths, which can improve the heat exchange efficiency.

[0071] In yet another embodiment, a plurality of accommodating portions 12 are provided, and the cross-sections of some accommodating portions 12 are circular, while the cross-sections of other accommodating portions 12 are square.

[0072] It is understandable that, in other embodiments, the cross-section of the accommodation portion 12 may also be a polygon other than a square, so as to adapt to the columnar battery cells 20 with different cross-sections.

[0073] Preferably, the inner wall of each accommodating portion 12 is completely in contact with the outer wall of the corresponding battery core 20 . This arrangement can shorten the distance between the battery core 20 and the circulating cooling medium, thereby improving the heat dissipation efficiency of the cooling medium.

[0074] In one embodiment, please refer to Figure 1 , Figure 2 and Fig.10 In the plurality of accommodating portions 12, the distance between any two adjacent accommodating portions 12 is equal. In this embodiment, the plurality of accommodating portions 12 are arranged at equal intervals in the main body 11, so that the space of the accommodating cavity in the main body 11 is effectively utilized, that is, the main body 11 can accommodate the most battery cells 20 in the same volume, thereby improving the volume capacity ratio.

[0075] In one embodiment, please refer to Figures 1 to 9 The liquid cooling device 10 further includes a plurality of quick-release connectors 14, which are used to connect the liquid inlet and the liquid inlet pipe, and also used to connect the liquid outlet and the liquid outlet pipe. In this embodiment, the quick-release connectors 14 can be quickly installed and disassembled to ensure that the cooling medium does not leak. In a specific implementation, the number of quick-release connectors 14 is determined according to actual needs, and it is sufficient to ensure that each liquid inlet and liquid outlet are connected with a quick-release connector 14.

[0076] Among them, the temperature difference of the traditional air-cooled battery cell 20 is within 5-8°C. The liquid cooling device 10 of the embodiment of the utility model adopts the above structure, which can control the temperature difference of the battery cell 20 within 3-5°C.

[0077] Please also read Fig. 9 and Fig.10 The utility model also provides an energy storage system 100, which includes a housing 30, a circuit board 40, a battery cell 20 and the above-mentioned liquid cooling device 10. The circuit board 40 and the liquid cooling device 10 are arranged in the housing 30, the battery cell 20 is accommodated in the accommodation portion 12 of the liquid cooling device 10, and a plurality of battery cells 20 are electrically connected to the circuit board 40 in series or in parallel or in series and parallel. The energy storage system 100 includes but is not limited to being used for server DC energy storage.

[0078] The energy storage system 100 provided by the utility model adopts the above-mentioned liquid cooling device 10, which can ensure the temperature uniformity of the battery cells 20 in the energy storage system 100, reduce system loss and noise, and enhance product reliability and life; the energy storage system 100 can be used in series or in parallel, has scalability, and has a higher volume energy ratio; the energy storage system 100 has a three-dimensional liquid cooling function and a higher heat exchange efficiency.

[0079] In a specific implementation, the housing 30 includes an upper housing 31 and a lower housing 32, which are interlocked and enclosed to form a housing space, and the circuit board 40 and the liquid cooling device 10 are both accommodated in the housing space. The housing 30 includes but is not limited to being made of metal material, which serves as an appearance decoration.

[0080] It is understandable that the energy storage system 100 also includes an insulating paper 50 disposed on the end surface of the battery cell 20, and a copper bus 60 stacked on the insulating paper 50 and used to connect the positive and negative electrodes of the battery cell 20. Of course, the energy storage system 100 also includes other existing structures required in actual implementation, which will not be described in detail here.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling device, characterized in that: include: A main body having a receiving cavity therein and a liquid inlet and a liquid outlet formed on the main body; as well as The accommodating portion is in a cylindrical shape and is used to accommodate the battery core. At least a portion of the accommodating portion is accommodated in the accommodating cavity, and an opening at at least one end of the accommodating portion is in communication with the outside; The cavity wall of the accommodating cavity and the accommodating portion enclose a sealed channel for the circulation of cooling medium. The liquid inlet and the liquid outlet are respectively connected to the sealed channel. The cooling medium flows in from the liquid inlet, flows through the sealed channel, and then flows out from the liquid outlet.

2. The liquid cooling device according to claim 1, characterized in that: It also includes at least one partition plate, which is arranged in the accommodating cavity and is used to divide the sealed channel into a plurality of sub-channels for cooling medium to flow.

3. The liquid cooling device according to claim 2, characterized in that: The plurality of sub-channels are isolated from each other; or, the plurality of sub-channels are connected in sequence; or, a part of the sub-channels are isolated from each other, and another part of the sub-channels are connected in sequence.

4. The liquid cooling device according to claim 2, characterized in that: The main body is formed by bending and welding a plate; and / or the accommodating portion is connected to the main body by welding; and / or the partition is connected to the main body and the accommodating portion respectively by welding.

5. The liquid cooling device according to any one of claims 1 to 4, characterized in that: The end face where the opening of the accommodating portion communicating with the outside world is located is flush with the cavity wall of the accommodating cavity; or, the end face where the opening of the accommodating portion communicating with the outside world is located is flush with the outer side wall of the main body; or, the end face where the opening of the accommodating portion communicating with the outside world is located protrudes from the outer side wall of the main body.

6. The liquid cooling device according to any one of claims 1 to 4, characterized in that: The wall thickness of the accommodating portion is 0.2 mm to 0.4 mm; and / or the wall thickness of the main body portion is 0.2 mm to 0.4 mm.

7. The liquid cooling device according to any one of claims 1 to 4, characterized in that: The accommodating parts are provided in plurality, and the cross sections of the plurality of accommodating parts are circular and / or square, and the inner side wall of each accommodating part is in contact with the outer side wall of the corresponding battery core.

8. The liquid cooling device according to any one of claims 1 to 4, characterized in that: The main body includes a first side plate and a second side plate that are arranged opposite to each other, two ends of the accommodating portion are respectively connected to the first side plate and the second side plate, and the first side plate and the second side plate are both provided with through holes for exposing the opening of the accommodating portion.

9. The liquid cooling device according to claim 8, characterized in that: The main body also includes a first end plate and a second end plate that are arranged opposite to each other. The first end plate, the first side plate, the second end plate and the second side plate are connected end to end. The first end plate and / or the second end plate are provided with the liquid inlet and the liquid outlet.

10. The liquid cooling device according to claim 9, characterized in that: The liquid cooling device further comprises a quick-release joint, wherein the quick-release joint is used to connect the liquid inlet with the liquid inlet pipe, and the quick-release joint is also used to connect the liquid outlet with the liquid outlet pipe.

11. An energy storage system, characterized in that: include: shell; A circuit board is arranged in the housing; The liquid cooling device according to any one of claims 1 to 10, disposed in the housing; and The battery core is accommodated in the accommodation portion, and the battery core is electrically connected to the circuit board.

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