Double-layer composite liquid cooling plate based on electrochemical energy storage electric device

Abstract

The invention discloses a double-layer composite liquid cooling plate based on an electrochemical energy storage power utilization device, and relates to the field of electrochemical energy storage power utilization devices, and the double-layer composite liquid cooling plate comprises a double-layer composite liquid cooling plate body and an electrochemical energy storage power utilization device body, the double-layer composite liquid cooling plate body comprises a flame-retardant heat insulation pad, a flame-retardant buffer pad, a liquid cooling pipe, a flame-retardant insulating heat conduction pad and a three-way quick connector, and the electrochemical energy storage power utilization device body comprises a single body. According to the double-layer composite liquid cooling plate based on the electrochemical energy storage power utilization device, the cost can be effectively controlled, the integration of multiple functions of heat conduction, liquid cooling, buffering, flame retardance and heat insulation is realized by the double-layer composite liquid cooling plate body, and batch and automatic assembly production of the electrochemical energy storage power utilization device body is facilitated, so that the cost is reduced; each part of the double-layer composite liquid cooling plate body is simple in structure, a simplified stacking process is adopted, the manufacturing process is short, and the manufacturing cost is low.

Description

Technical Field

[0001] This invention relates to the field of electrochemical energy storage devices, and particularly to a double-layer composite liquid cooling plate based on an electrochemical energy storage device. Background Technology

[0002] With the approaching effective date of the "Safety Requirements for Power Batteries for Electric Vehicles" (GB38031-2025) and the "Safety Requirements for Lithium Batteries and Battery Packs for Energy Storage Systems" (GB44240-2024) taking effect on August 1, 2025, the safety of electrochemical energy storage and power consumption systems in both electric vehicles and energy storage applications has reached a new level of attention. Furthermore, the thermal safety of electrochemical energy storage devices and power consumption systems has become a core indicator for system evaluation and has evolved into a cross-disciplinary safety management system.

[0003] Thermal safety management in common electrochemical energy storage devices and systems primarily focuses on the structural design of trays, covers, or liquid cooling pipe arrangements, shapes, and dimensions. However, descriptions of the internal thermal safety management structures and components of electrochemical energy storage devices, especially between individual units, are scarce. Furthermore, the reported internal thermal safety management components for electrochemical energy storage devices cannot simultaneously meet the requirements of volume changes and timely heat dissipation during charging and discharging processes.

[0004] Therefore, it is necessary to propose a double-layer composite liquid-cooled plate based on an electrochemical energy storage device to solve the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide a double-layer composite liquid-cooled plate based on an electrochemical energy storage device, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A double-layer composite liquid-cooled plate based on an electrochemical energy storage device includes a double-layer composite liquid-cooled plate body and an electrochemical energy storage device body. The double-layer composite liquid-cooled plate body includes a flame-retardant heat-insulating pad, a flame-retardant buffer pad, a liquid-cooling pipe, a flame-retardant insulating heat-conducting pad, and a three-way quick connector. The electrochemical energy storage device body includes a single unit. The liquid cooling pipe is installed in the inner cavity of the flame-retardant buffer pad, and the flame-retardant heat insulation pad is installed on the side of the flame-retardant buffer pad.

[0007] Preferably, the thickness of the flame-retardant buffer pad is greater than that of the liquid cooling pipe. The two ends of the liquid cooling pipe are respectively the inlet and the outlet, which are located at the two right-angled edges in the vertical direction of the liquid cooling pipe. Both the inlet and the outlet are connected to the outside of the flame-retardant buffer pad. The liquid cooling pipe is installed in the inner cavity of the flame-retardant buffer pad in an "S" shape, and both sides of the liquid cooling pipe are connected to the outside.

[0008] Preferably, one liquid cooling pipe and one flame-retardant buffer pad constitute a group, and the flame-retardant heat insulation pad is symmetrically installed on both sides of the two groups of liquid cooling pipes and flame-retardant buffer pads.

[0009] Preferably, the length and width of the flame-retardant heat insulation pad are connected to the length and width of the flame-retardant buffer pad, and the length of the flame-retardant buffer pad is greater than that of the liquid cooling pipe.

[0010] Preferably, there are two tee quick connectors, with the two ends of each tee quick connector connected to the inlet and outlet of the liquid cooling pipes on both sides, respectively. The dimension of the tee quick connector in the thickness direction of the flame-retardant buffer pad is the same as the sum of the diameters of the two sets of liquid cooling pipes and the total thickness of the flame-retardant insulation pad. The dimension of the tee quick connector in the length direction of the flame-retardant buffer pad is 10-15mm.

[0011] Preferably, there are two flame-retardant insulating thermal conductive pads, which are symmetrically installed on opposite sides of the two flame-retardant buffer pads. The length and width of the flame-retardant insulating thermal conductive pads are the same as those of the flame-retardant buffer pads, and the thickness of the flame-retardant insulating thermal conductive pads is greater than 40% of the thickness of the flame-retardant buffer pads.

[0012] Preferably, the main body of the electrochemical energy storage device is a battery module, and the individual cells are battery cells connected in series and parallel, and the individual cells constitute the main body of the electrochemical energy storage device.

[0013] Preferably, the other end of the three-way quick connector extends to the outside of the electrochemical energy storage device body for connection with the electrochemical energy storage device body and other liquid cooling devices and heat exchangers.

[0014] Preferably, the double-layer composite liquid cooling plate body is installed on the outer wall of adjacent units via a flame-retardant insulating thermally conductive pad.

[0015] Preferably, the flame-retardant insulating thermally conductive pad is attached to the outer wall of the electrochemical energy storage device body, and the outer wall of the liquid cooling pipe is attached to the outer wall of the flame-retardant insulating thermally conductive pad.

[0016] Compared with the prior art, the present invention provides a double-layer composite liquid cooling plate based on an electrochemical energy storage device, which has the following beneficial effects: This double-layer composite liquid cooling plate based on electrochemical energy storage devices can effectively control costs. The double-layer composite liquid cooling plate integrates multiple functions such as heat conduction, liquid cooling, buffering, and flame retardant insulation, which facilitates the mass production and automated assembly of electrochemical energy storage devices to reduce costs. The components of the double-layer composite liquid cooling plate have simple structures and adopt simplified stacking processes, resulting in short manufacturing processes and low manufacturing costs.

[0017] This invention provides a double-layer composite liquid-cooled plate for electrochemical energy storage devices. Compared to other liquid-cooled components between individual cells in electrochemical energy storage devices, this invention hides the liquid-cooling pipe within a contoured cavity of a flame-retardant buffer pad and employs a flame-retardant insulating thermally conductive pad for double insulation protection, thereby improving the insulation and high-voltage resistance performance of the double-layer composite liquid-cooled plate body. Secondly, the organic combination of four functional components ensures the discharge of excess heat from the electrochemical energy storage device while also preventing and isolating the path of heat conduction from a single cell in the thickness direction to adjacent cells in the event of thermal anomalies or thermal runaway. Finally, the thickness compatibility and balance of the installation pre-compression pressure and the volume changes of the individual cells throughout the entire life cycle of the device comprehensively ensure the safety of the electrochemical energy storage device.

[0018] This dual-layer composite liquid-cooled plate for electrochemical energy storage devices improves battery life and safety performance. The liquid-cooling pipe 103 employs a special S-shaped bend, which reduces the temperature gradient between individual cells from near the conductive electrode post to the bottom, regardless of whether the coolant flows from top to bottom or in the opposite direction. This achieves relatively uniform cell temperature, reduces the temperature difference between individual cell micro-regions and the overall device, and improves temperature consistency. In particular, the top-down, series cooling scheme effectively controls the uniformity of cell temperature and the temperature consistency within the device, thereby controlling cell expansion and preventing localized temperature-stress coupling damage, ultimately extending the device's lifespan and safety performance. Because the temperature difference is reduced from 5℃ to 3℃ or below, the cycle life of the lithium iron phosphate battery module can be increased by up to 30%. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the liquid cooling pipe of the present invention; Figure 3 This is a schematic diagram of the installation of the flame-retardant heat insulation pad of the present invention; Figure 4 This is a schematic diagram of the installation of the flame-retardant buffer pad of the present invention; Figure 5 This is a schematic diagram of the installation of the tee quick connector of the present invention; Figure 6 This is a schematic diagram of the installation of the double-layer composite liquid cooling plate body of the present invention.

[0020] In the figure: 1. Double-layer composite liquid cooling plate body; 101. Flame-retardant heat insulation pad; 102. Flame-retardant buffer pad; 103. Liquid cooling pipe; 104. Flame-retardant insulating heat-conducting pad; 105. T-joint quick connector; 2. Electrochemical energy storage device body; 201. Single unit. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1: like Figures 1-6 As shown, a double-layer composite liquid-cooled plate based on an electrochemical energy storage device includes a double-layer composite liquid-cooled plate body 1 and an electrochemical energy storage device body 2. The double-layer composite liquid-cooled plate body 1 includes a flame-retardant heat-insulating pad 101, a flame-retardant buffer pad 102, a liquid-cooling pipe 103, a flame-retardant insulating heat-conducting pad 104, and a three-way quick connector 105. The electrochemical energy storage device body 2 includes a single unit 201. The liquid cooling pipe 103 is installed in the inner cavity of the flame-retardant buffer pad 102, and the flame-retardant heat insulation pad 101 is installed on the side of the flame-retardant buffer pad 102. The thickness of the flame-retardant buffer pad 102 is greater than that of the liquid cooling pipe 103. The two ends of the liquid cooling pipe 103 are respectively the inlet and outlet, which are located at the two right-angled edges in the vertical direction of the liquid cooling pipe 103. Both the inlet and outlet are connected to the outside of the flame-retardant buffer pad 102. The liquid cooling pipe 103 is installed in the inner cavity of the flame-retardant buffer pad 102 in an "S" shape. Both sides of the liquid cooling pipe 103 are connected to the outside. A liquid cooling pipe 103 and a flame-retardant buffer pad 102 form a group, and the flame-retardant heat insulation pad 101 is symmetrically installed on both sides of the two groups of liquid cooling pipes 103 and flame-retardant buffer pads 102. The length and width of the flame-retardant heat insulation pad 101 are connected to the length and width of the flame-retardant buffer pad 102, and the length of the flame-retardant buffer pad 102 is greater than that of the liquid cooling pipe 103. There are two tee quick connectors 105. The two ends of the two tee quick connectors 105 are respectively connected to the inlet and outlet of the liquid cooling pipes 103 on both sides. The dimension of the tee quick connector 105 in the thickness direction of the flame retardant buffer pad 102 is the same as the sum of the diameters of the two sets of liquid cooling pipes 103 and the total thickness of the flame retardant insulation pad 101. The dimension of the tee quick connector 105 in the length direction of the flame retardant buffer pad 102 is 10-15mm. There are two flame-retardant insulating heat-conducting pads 104, which are symmetrically installed on opposite sides of two flame-retardant buffer pads 102. The length and width of the flame-retardant insulating heat-conducting pads 104 are the same as those of the flame-retardant buffer pads 102, and the thickness of the flame-retardant insulating heat-conducting pads 104 is 40% greater than the thickness of the flame-retardant buffer pads 102. The main body 2 of the electrochemical energy storage device is a battery module, and the individual cells 201 are series-parallel connected cells. The individual cells 201 constitute the main body 2 of the electrochemical energy storage device. The other end of the three-way quick connector 105 extends to the outside of the electrochemical energy storage device body 2 for connection with the electrochemical energy storage device body 2 and other liquid cooling devices and heat exchangers. The double-layer composite liquid cooling plate body 1 is installed on the outer wall of the adjacent unit 201 via a flame-retardant insulating heat-conducting pad 104; The flame-retardant insulating thermally conductive pad 104 is attached to the outer wall of the electrochemical energy storage device body 2, and the outer wall of the liquid cooling pipe 103 is attached to the outer wall of the flame-retardant insulating thermally conductive pad 104.

[0023] Example 2: like Figures 1-6 As shown, a double-layer composite liquid cooling plate based on an electrochemical energy storage device has a flame-retardant buffer pad 102 with a contoured gap cut out. The shape and size of the contoured gap are cut according to the shape and size of the liquid cooling pipe 103, thus creating a gap similar to the liquid cooling pipe 103. The thickness of the flame-retardant buffer pad 102 is greater than the diameter of the liquid cooling pipe 103, which is used to protect the liquid cooling pipe 103. The width of the contoured gap on the flame-retardant buffer pad 102 is 0.1 mm smaller than the diameter of the liquid cooling pipe 103, which is used to cover and fix the liquid cooling pipe 103. The inlet and outlet of the liquid cooling pipe 103 are located at the edges of the two right-angled portions in the vertical direction. The liquid cooling pipe 103 adopts an S-shaped bend to increase the cooling path and surface area of ​​the body 2 of the electrochemical energy storage device, while reducing the temperature gradient / temperature difference in the height direction of the liquid cooling plate.

[0024] A module consisting of two sets of flame-retardant buffer pads 102 and liquid cooling pipes 103 is stacked to meet the heat dissipation requirements of high-rate charging and discharging (e.g., 6C) and high-current transmission scenarios (e.g., 587Ah~1300Ah). A flame-retardant heat-insulating pad 101 is installed between the two layers of flame-retardant buffer pads 102 to isolate the module composed of the flame-retardant buffer pads 102 and liquid cooling pipes 103, preventing heat spread from individual cells overheating or experiencing thermal runaway to adjacent liquid cooling pipes 103 or cells. The length and width of the flame-retardant heat-insulating pad 101 are the same as those of the flame-retardant buffer pad 102, but the length of the flame-retardant buffer pad 102 is slightly longer than that of the liquid cooling pipe 103 by 5-10mm.

[0025] Two T-connectors 105 are respectively connected and installed on the reserved ports of the liquid cooling pipe 103. The dimension of the T-connector 105 in the thickness direction of the flame-retardant buffer pad 102 is the same as the sum of the diameters of the two sets of liquid cooling pipes 103 and the total thickness of the flame-retardant insulation pad 101, so as to protect the T-connector 105. The dimension of the T-connector 105 in the length direction of the flame-retardant buffer pad 102 is 10-15mm longer, so as to connect the T-connector 105 to the outside.

[0026] To improve the above assembly and ensure the tightness of contact and smooth heat exchange between the integral double-layer composite liquid-cooled plate body 1 and the electrochemical energy storage device body 2, flame-retardant thermal conductive pads 104 are installed on both sides of the double-layer composite liquid-cooled plate body 1 to improve the heat exchange contact area between the liquid cooling pipe 103 in the double-layer composite liquid-cooled plate body 1 and the electrochemical energy storage device body 2. The length and width of the flame-retardant insulating thermal conductive pad 104 are the same as those of the flame-retardant buffer pad 102, and the thickness of the flame-retardant insulating thermal conductive pad 104 is 40% greater than the thickness of the flame-retardant buffer pad, allowing for a 20-35% thickness change due to pre-compression of the flame-retardant buffer pad in the electrochemical energy storage device.

[0027] To further illustrate the function of the double-layer composite liquid-cooled plate body 1, it will first be placed inside the electrochemical energy storage device body 2 for explanation. The double-layer composite liquid-cooled plate body 1 is placed in the thickness direction of each pair of individual units in the electrochemical energy storage device body 2. The coolant inlet and outlet and the three-way quick connector 105 at both ends of the double-layer composite liquid cooling plate 1 extend to the outside of the electrochemical energy storage device body 2 so as to connect with the electrochemical energy storage device body 2 and other liquid cooling devices or heat exchangers; in order to improve the fit between the double-layer composite liquid cooling plate body 1 and the individual units 201 in the electrochemical energy storage device body 2, pre-compression is performed in the thickness direction of the electrochemical energy storage device body 2 to ensure bidirectional fit between the flame-retardant heat-conducting pad 104 in the double-layer composite liquid cooling plate body 1 and the liquid cooling pipe 103 and the individual units 201; the flame-retardant buffer pad 102 is compressed in the thickness direction under the action of each individual unit 201 in the electrochemical energy storage device body 2 to balance the uneven thickness of each individual unit 201 and the volume change during charging, discharging or power consumption.

[0028] To further illustrate the effect of the double-layer composite liquid-cooled plate body 1, the key component, the flame-retardant insulating pad 101, is described below. During the power consumption of each cell 201 in the electrochemical energy storage device body 2, if a cell 201 experiences overheating or thermal runaway, it is necessary to isolate the heat from adjacent cells and liquid-cooled pipes 103. In this case, the flame-retardant insulating plate needs to have excellent insulation properties. The performance parameters of this flame-retardant insulating pad 101 are shown in Table 1 below: The minimum thickness of the flame-retardant insulation material 3 was determined by continuous burning in an oxygen-acetylene outer flame. The experiment showed that the cold surface temperature tended to stabilize at around 2500s and remained below 300℃. Therefore, 1.5mm flame-retardant insulation material 3 was used as the flame-retardant insulation pad 102 in the middle of the double-layer composite liquid cooling plate to ensure thermal isolation between the two liquid cooling pipes 103 and the electrochemical energy storage device body 2.

[0029] To confirm the compressive strength of the flame-retardant insulation material, compressive stress verification was performed on the flame-retardant insulation material 3, and the results are shown in Table 2. The double-layer composite liquid cooling plate body 1 is constantly subjected to compressive force from the thickness direction within the electrochemical energy storage device body 2. The flame-retardant insulation pad 102 needs to simultaneously possess near-nano-scale closed vacuum insulation pores and withstand compressive pressure in the thickness direction. Therefore, the flame-retardant insulation pad 102 has the ability to maintain the relative integrity of the vacuum insulation pores even under a compressive pressure ≤0.3MPa, i.e., the thickness change of the body material is ≤10%, as shown in Table 2 below:

[0030] Example 3: The cross-sectional shape of the liquid cooling tube 103 can be circular or square. Furthermore, the arrangement density of the liquid cooling tube 103 in the height direction can be modified and optimized according to the space capacity of the electrochemical energy storage device body 2, the charge and discharge rate, and the operating temperature requirements. Alternatively, it can be a composite structure with variable cross-sectional shapes that combines the aforementioned cross-sectional shapes.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device, comprising a double-layer composite liquid-cooled plate body (1) and an electrochemical energy storage device body (2), characterized in that: The double-layer composite liquid cooling plate body (1) includes a flame-retardant heat insulation pad (101), a flame-retardant buffer pad (102), a liquid cooling pipe (103), a flame-retardant insulating heat-conducting pad (104), and a three-way quick connector (105). The electrochemical energy storage device body (2) includes a single unit (201). The liquid cooling pipe (103) is installed in the inner cavity of the flame-retardant buffer pad (102), and the flame-retardant heat insulation pad (101) is installed on the side of the flame-retardant buffer pad (102).

2. The double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: The thickness of the flame-retardant buffer pad (102) is greater than that of the liquid cooling pipe (103). The two ends of the liquid cooling pipe (103) are respectively the inlet and the outlet, which are located at the two right-angled edges in the vertical direction of the liquid cooling pipe (103). The inlet and the outlet are connected to the outside of the flame-retardant buffer pad (102). The liquid cooling pipe (103) is installed in the inner cavity of the flame-retardant buffer pad (102) in an "S" shape. The two sides of the liquid cooling pipe (103) are connected to the outside.

3. The double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: One of the liquid cooling pipes (103) and one of the flame-retardant buffer pads (102) form a group, and the flame-retardant heat insulation pads (101) are symmetrically installed on both sides of the two groups of liquid cooling pipes (103) and flame-retardant buffer pads (102).

4. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 3, characterized in that: The length and width of the flame-retardant heat insulation pad (101) are connected to the length and width of the flame-retardant buffer pad (102), and the length of the flame-retardant buffer pad (102) is greater than that of the liquid cooling pipe (103).

5. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: There are two T-joints (105). The two ends of the two T-joints (105) are respectively connected to the inlet and outlet of the liquid cooling pipes (103) on both sides. The dimension of the T-joint (105) in the thickness direction of the flame-retardant buffer pad (102) is the same as the sum of the diameters of the two sets of liquid cooling pipes (103) and the total thickness of the flame-retardant heat insulation pad (101). The dimension of the T-joint (105) in the length direction of the flame-retardant buffer pad (102) is 10-15mm.

6. The double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: There are two flame-retardant insulating heat-conducting pads (104). The two flame-retardant insulating heat-conducting pads (104) are symmetrically installed on opposite sides of the two flame-retardant buffer pads (102). The length and width of the flame-retardant insulating heat-conducting pads (104) are the same as those of the flame-retardant buffer pads (102). The thickness of the flame-retardant insulating heat-conducting pads (104) is greater than 40% of the thickness of the flame-retardant buffer pads (102).

7. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: The main body (2) of the electrochemical energy storage device is a battery module, and the individual cell (201) is a series-parallel connected battery cell. The individual cells (201) constitute the main body (2) of the electrochemical energy storage device.

8. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 7, characterized in that: The other end of the three-way quick connector (105) extends to the outside of the electrochemical energy storage device body (2) for connection with the electrochemical energy storage device body (2) and other liquid cooling devices and heat exchangers.

9. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: The double-layer composite liquid cooling plate body (1) is installed on the outer wall of the adjacent unit (201) through a flame-retardant insulating heat-conducting pad (104).

10. A double-layer composite liquid-cooled plate based on an electrochemical energy storage device according to claim 1, characterized in that: The flame-retardant insulating thermal pad (104) is attached to the outer wall of the electrochemical energy storage device body (2), and the outer wall of the liquid cooling pipe (103) is attached to the outer wall of the flame-retardant insulating thermal pad (104).

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