An immersion liquid cooling PACK

Abstract

An immersion liquid-cooled battery pack relates to the field of electrochemical energy storage technology. It includes a battery pack housing containing several battery modules, each consisting of sealed cells connected in series. A two-way shut-off valve is located at one end of the battery pack housing. The outside of the battery pack housing has a shut-off valve inlet and an outlet connected to the two-way shut-off valve. The battery pack housing is filled with coolant, and the battery modules are immersed in the coolant. By placing the sealed cells within the coolant-immersed battery pack housing, effective all-around heat dissipation is achieved. Furthermore, the two-way shut-off valve allows for the addition or release of coolant in special circumstances, pressurizing or depressurizing the battery pack housing, thereby ensuring the normal and stable operation of the energy storage system.

Description

Technical Field

[0001] This utility model relates to an immersion liquid-cooled PACK, and relates to the field of electrochemical energy storage technology. Background Technology

[0002] In electrochemical energy storage applications, battery cells generate a significant amount of heat during charging and discharging. If this heat is not dissipated effectively and promptly, it can negatively impact battery performance, lifespan, and safety.

[0003] Existing energy storage PACK systems typically use air cooling for heat dissipation. While air cooling systems are simple in structure and low in cost, their heat dissipation effect is poor, making them prone to thermal runaway. Therefore, liquid cooling is a better option. For example, patent CN116632434A discloses a liquid-cooled battery PACK box, including an upper cover, a lower cover, and a battery pack and a liquid cooling plate disposed within the upper and lower covers. The openings of the upper and lower covers extend outwards, and the connecting edges are fixed together by screws and rivet nuts. A cover sealing ring is provided between the connecting edges. The liquid cooling plate is disposed on the inner bottom surface of the lower cover, and the battery pack is disposed on the upper part of the liquid cooling plate. A fire detector and a B are installed on the front side of the upper cover. MS Cover; In this invention, the upper and lower covers are integrally formed from metal sheets, and multiple reinforcing ribs are designed on the surface to balance strength and manufacturing cost. In particular, the airtightness index far exceeds that of ordinary steel plate welded boxes, and the fire resistance and high temperature resistance far exceed that of plastic shell boxes. It has superior performance, low cost, high production efficiency, and reduces carbon emissions. However, the liquid cooling plate structure used in this solution is only set on the inner bottom surface of the lower cover, while the battery pack is set on the upper part of the liquid cooling plate. The heat dissipation of the battery pack is concentrated at the bottom, and the temperature conduction is uneven. It is easy for the upper part to overheat and the lower part to be cold. It still cannot effectively dissipate heat from the battery pack and improve its safety. Therefore, an immersion liquid cooling PACK structure is proposed to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this utility model is to address the defects or deficiencies in the existing technology by providing an immersion liquid-cooled PACK. By placing the sealed battery cells in the PACK housing immersed in coolant, heat dissipation can be effectively achieved from all directions. Furthermore, the two-way shut-off valve allows for the discharge or addition of coolant in special circumstances, as well as the pressurization or depressurization of the PACK housing, thereby ensuring the normal and stable operation of the energy storage system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: It includes a PACK housing 1, in which several battery packs are arranged, each battery pack being composed of several sealed cells 3 connected in series. A two-way shut-off valve 6 is provided at one end of the PACK housing 1, and a shut-off valve inlet 7 and a shut-off valve outlet 8 are provided on the outside of the PACK housing 1 and connected to the two-way shut-off valve 6. Coolant 13 is filled into the PACK housing 1, and the battery packs are immersed in the coolant 13.

[0006] Furthermore, the PACK housing 1 is provided with a water inlet pipe 11 and a drain pipe 12. The water inlet pipe 11 is located at the top of the battery pack, and the drain pipe 12 is located at the bottom of the battery pack. The outlet of the water inlet pipe 11 and the inlet of the drain pipe 12 are located on opposite sides.

[0007] Furthermore, the outer side of the PACK housing 1 is provided with a coolant inlet 9 and a coolant outlet 10, which extend into the PACK housing 1 and are connected to the inlet pipe 11 and the outlet pipe 12, respectively.

[0008] Furthermore, a fixing plate 4 is provided on the top of the battery pack. The fixing plate 4 has a groove that matches the shape of the top of the battery cell 3 to fix the battery cell 3. A CCS integrated busbar 5 is provided on the top of the fixing plate 4 and is electrically connected to the battery cell 3.

[0009] Furthermore, the CCS integrated busbar 5 integrates a cell control circuit, a voltage acquisition harness, and a temperature sensor, wherein the temperature sensor is attached to the top surface of the cell 3.

[0010] Furthermore, a pressure sensor 14 is also provided on the CCS integrated busbar 5.

[0011] Furthermore, the top of the PACK box 1 is provided with a sealing top cover 2, and the bottom plate of the PACK box 1 has a concave-convex structure that contacts the battery cell 3. The width of the concave position is smaller than the width of the battery cell 3. The PACK box 1 fixes the battery cell 3 through the concave position of the bottom plate.

[0012] Furthermore, the coolant 13 is a fluorinated liquid or a silicone-based oil with a thermal conductivity ≥0.05W / m·K and a viscosity ≤1.5mPa·s.

[0013] Furthermore, the coolant inlet 9 and coolant outlet 10 are externally connected to the heat exchanger.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are as follows: by setting the sealed battery cell in the PACK housing immersed in coolant, heat dissipation can be effectively carried out in all directions, and the two-way shut-off valve can discharge or add coolant in special circumstances, pressurize or depressurize the PACK housing, thereby ensuring that the energy storage system can operate normally and stably. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 The second angle view;

[0018] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0019] Figure 4 This is a schematic diagram showing a partial structural disassembly of this utility model.

[0020] Explanation of reference numerals in the attached diagram: 1. PACK housing; 2. Sealed top cover; 3. Battery cell; 4. Fixing plate; 5. CCS integrated busbar; 6. Two-way shut-off valve; 7. Shut-off valve inlet port; 8. Shut-off valve outlet port; 9. Coolant inlet port; 10. Coolant outlet port; 11. Inlet pipe; 12. Drain pipe; 13. Coolant; 14. Pressure sensor. Detailed Implementation

[0021] See Figures 1-4As shown, the technical solution adopted in this specific embodiment is as follows: It includes a PACK box 1, in which several battery packs are arranged. Each battery pack is composed of several sealed cells 3 connected in series. A two-way shut-off valve 6 is provided at one end of the PACK box 1. A shut-off valve inlet 7 and a shut-off valve outlet 8 are provided on the outside of the PACK box 1 and connected to the two-way shut-off valve 6. Coolant 13 is filled in the PACK box 1, and the battery packs are immersed in the coolant 13. In order to solve the problem of uneven temperature conduction caused by the one-sided heat dissipation of the cells in the traditional liquid-cooled PACK system, an immersion PACK structure is adopted in this embodiment. The battery packs composed of several cells are immersed in the coolant, so that the cells can achieve all-round heat conduction, thereby ensuring the operational safety of the cells. At the same time, since the cells are immersed in the coolant, there will be no fire problem in the traditional structure, so there is no need to equip a fire extinguishing system, reducing production costs.

[0022] To further ensure the operational safety of the PACK enclosure, a two-way shut-off valve is installed. When the internal pressure is abnormal, the valve can quickly increase or decrease the pressure, thereby automatically maintaining the internal pressure value and ensuring the normal operation of the equipment. The inlet of the two-way shut-off valve is connected to the cooling tank or inert gas supply device, while the outlet is connected to the pressure relief and recovery device.

[0023] More specifically, the PACK housing 1 is equipped with a water inlet pipe 11 and a drain pipe 12. The water inlet pipe 11 is located at the top of the battery pack, and the drain pipe 12 is located at the bottom of the battery pack. The outlet of the water inlet pipe 11 and the inlet of the drain pipe 12 are located on opposite sides. In this embodiment, in order to achieve the circulation of coolant, the water inlet pipe and the drain pipe are staggered. The water inlet pipe is used to inject low-temperature coolant, while the drain pipe is used to discharge high-temperature coolant.

[0024] More specifically, the PACK housing 1 is provided with a coolant inlet 9 and a coolant outlet 10 on its outer side, which extend into the PACK housing 1 and are connected to the inlet pipe 11 and the drain pipe 12, respectively. The coolant inlet and outlet ports are used to connect the inlet pipe and the drain pipe. At the same time, the coolant inlet 9 and the coolant outlet 10 are externally connected to the heat exchanger, thereby forming a closed-loop circulation system.

[0025] More specifically, a fixing plate 4 is provided on the top of the battery pack. The fixing plate 4 has a groove that matches the shape of the top of the battery cell 3 to fix the battery cell 3. A CCS integrated busbar 5 is provided on the top of the fixing plate 4 and is electrically connected to the battery cell 3. The CCS integrated busbar 5 integrates the battery cell control circuit, voltage acquisition harness, and temperature sensor. The temperature sensor is attached to the top surface of the battery cell 3. By setting up the CCS integrated busbar, the circuit and harness layout can be greatly optimized, making the equipment structure more compact. At the same time, the temperature sensor is also integrated to monitor the temperature of each battery cell. When an abnormal temperature occurs, the control circuit can control the circulation and replacement of coolant, thereby effectively suppressing thermal runaway and ensuring the safe operation of the energy storage system.

[0026] More specifically, the CCS integrated busbar 5 is also equipped with a pressure sensor 14. In this embodiment, the pressure sensor is also linked with the two-way shut-off valve. The pressure sensor collects the pressure data inside the box, and the control circuit determines whether to open the two-way shut-off valve based on the collected pressure data, and increases or decreases the pressure according to the actual pressure value.

[0027] More specifically, the PACK housing 1 is provided with a sealed top cover 2, and the bottom plate of the PACK housing 1 has a concave-convex structure that contacts the battery cell 3. The width of the concave part is smaller than the width of the battery cell 3. The PACK housing 1 fixes the battery cell 3 through the concave part of the bottom plate. In this embodiment, in order to enable the battery cell to be fully immersed in the coolant, a concave-convex structure is designed on the bottom plate of the housing. The width of the concave part is smaller than the width of the battery cell, so that the battery cell can be installed in the concave part, and the coolant can enter the concave part to dissipate heat from the bottom of the battery cell.

[0028] More specifically, the coolant 13 is a fluorinated liquid or a silicone oil with a thermal conductivity ≥0.05W / m·K and a viscosity ≤1.5mPa·s. To ensure the heat dissipation effect of the coolant, a fluorinated liquid or silicone oil is used, which can effectively conduct heat and is not flammable, further improving the safety of equipment operation.

[0029] The working principle of this utility model is as follows: The PACK housing 1 is a sealed structure, and after the battery pack is assembled, it is sealed and encapsulated by the sealing top cover 2. Coolant is injected through the connection between the coolant inlet 9 and the external heat exchanger, ensuring that all battery cells 3 are completely submerged in the coolant. Simultaneously, due to the concave-convex structure at the bottom of the PACK housing 1, the battery cells 3 are installed in the recessed positions, allowing for comprehensive heat dissipation through the coolant. During operation, a temperature sensor monitors the battery cell temperature in real time, while a pressure sensor detects the internal pressure of the PACK housing 1 in real time. When an abnormal internal temperature occurs, the coolant inlet 9 and coolant outlet 10 can be opened to control the PACK. The coolant inside the CK housing 1 is replaced to ensure that the internal temperature of the housing remains normal. When the internal pressure is abnormal, the pressure sensor will be linked with the two-way shut-off valve 6. If the pressure is too high, the shut-off valve outlet port 8 will be opened to drain the internal coolant. If the internal coolant decreases rapidly due to an abnormality, the shut-off valve inlet port 7 will be opened to inject coolant until the pressure returns to normal. By circulating and replacing the coolant, the internal temperature can be kept within the set range to ensure the normal operation of the energy storage system. At the same time, the two-way shut-off valve is used to deal with abnormal internal pressure of the PACK housing 1, which can realize pressurization and depressurization to ensure that the components of the energy storage system will not be damaged due to abnormal pressure, thereby effectively improving the operational safety of the energy storage system.

[0030] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An immersion liquid-cooled PACK, characterized in that: It includes a PACK box (1), which contains several battery packs. Each battery pack consists of several sealed cells (3) connected in series. A two-way shut-off valve (6) is provided at one end of the PACK box (1). A shut-off valve inlet (7) and a shut-off valve outlet (8) are provided on the outside of the PACK box (1) and connected to the two-way shut-off valve (6). Coolant (13) is filled into the PACK box (1), and the battery packs are immersed in the coolant (13).

2. The immersion liquid-cooled PACK according to claim 1, characterized in that: The PACK housing (1) is equipped with a water inlet pipe (11) and a drain pipe (12). The water inlet pipe (11) is located at the top of the battery pack, and the drain pipe (12) is located at the bottom of the battery pack. The outlet of the water inlet pipe (11) and the inlet of the drain pipe (12) are located on opposite sides.

3. The immersion liquid-cooled PACK according to claim 1, characterized in that: The PACK housing (1) is provided with a coolant inlet (9) and a coolant outlet (10) on the outside, which extend into the PACK housing (1) and are connected to the inlet pipe (11) and the outlet pipe (12), respectively.

4. The immersion liquid-cooled PACK according to claim 1, characterized in that: The battery pack is provided with a fixing plate (4) on the top. The fixing plate (4) is provided with a groove that matches the shape of the top of the cell (3) to fix the cell (3). The fixing plate (4) is provided with a CCS integrated busbar (5) on the top and electrically connected to the cell (3).

5. The immersion liquid-cooled PACK according to claim 4, characterized in that: The CCS integrated busbar (5) integrates a cell control circuit, a voltage acquisition harness, and a temperature sensor, wherein the temperature sensor is attached to the top surface of the cell (3).

6. The immersion liquid-cooled PACK according to claim 4, characterized in that: A pressure sensor (14) is also provided on the CCS integrated busbar (5).

7. The immersion liquid-cooled PACK according to claim 1, characterized in that: The PACK box (1) is provided with a sealed top cover (2) on the top. The bottom plate of the PACK box (1) has a concave-convex structure that contacts the battery cell (3). The width of the concave position is smaller than the width of the battery cell (3). The PACK box (1) fixes the battery cell (3) through the concave position of the bottom plate.

8. The immersion liquid-cooled PACK according to claim 1, characterized in that: The coolant (13) is a fluorinated liquid or a silicone oil with a thermal conductivity ≥0.05W / m·K and a viscosity ≤1.5mPa·s.

9. The immersion liquid-cooled PACK according to claim 3, characterized in that: The coolant inlet (9) and coolant outlet (10) are externally connected to the heat exchanger.

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