Liquid cooling device for solid-state battery module

Abstract

The invention discloses a liquid cooling device for a solid-state battery module, which belongs to the technical field of solid-state battery modules and comprises a plurality of battery units. Each battery unit comprises a solid-state battery monomer and a side cooling structure; the side cooling structure comprises a pump drive unit and a liquid flow cooling channel, and a plurality of sensing units are evenly arranged on the liquid flow cooling channel. When the solid-state battery module operates, each solid-state battery monomer forming the battery module can be subjected to independent liquid cooling treatment through the side cooling structure arranged on each solid-state battery monomer, and the solid-state battery monomers are subjected to independent liquid cooling through the side cooling structures; the temperature of different parts of the surface of the side wall of the single solid-state battery can be monitored in real time, when the temperature of a certain local area of the surface of the single solid-state battery is monitored to be too high, the flow rate of cooling liquid in a high-temperature area can be dynamically adjusted in a targeted mode, and the heat exchange intensity of different heat dissipation areas of the single solid-state battery is adjusted; dynamic liquid cooling adjustment can quickly eliminate single battery hot spots, and a heat transfer path is blocked in a targeted manner.

Description

Technical Field

[0001] This invention relates to the field of solid-state battery module technology, and more specifically, to a liquid cooling device for solid-state battery modules. Background Technology

[0002] A solid-state battery module is a battery assembly that combines multiple solid-state battery cells through a specific connection method, and is equipped with a management system, structural components, etc., to achieve specific functions and performance. Its core lies in using a solid electrolyte instead of a traditional liquid electrolyte. The solid electrolyte facilitates the transfer of lithium ions between the positive and negative electrodes, completing the charge-discharge cycle. This change makes solid-state battery modules more compact, smaller in size, and significantly improves energy density compared to other battery modules.

[0003] Currently, the main cooling methods for solid-state battery modules on the market include air cooling, metal conduction cooling, and liquid cooling. However, these traditional heat dissipation technologies have some shortcomings, especially when dealing with solid-state battery modules with high energy density and high power output, where their limitations become more apparent.

[0004] Air cooling relies on natural or forced convection of air to dissipate heat, but its cooling efficiency is relatively low, making it difficult to meet the heat dissipation requirements of high-power solid-state battery modules when working under heavy loads, and easily leading to local overheating of the battery. Although metal conduction cooling has good thermal conductivity, it is heavy and has a complex layout in battery modules, making it difficult to achieve precise temperature control of individual battery cells. Although liquid cooling has a higher heat exchange efficiency than air cooling, when using traditional water-cooled plates to dissipate heat from solid-state battery modules, most of the time the water-cooled plate only contacts one or both sides of the battery module. Heat can only be conducted away through the surface of the battery module. However, for the tightly stacked solid-state batteries in the module, the heat dissipation intensity cannot be adjusted according to the heat load differences in different areas of the sidewalls. This will result in the problem of "insufficient heat dissipation in high-temperature areas and excessive cooling in low-temperature areas". This not only affects the heat dissipation effect, but also causes internal thermal stress in the battery due to excessive temperature difference between the sidewalls, which accelerates structural failure.

[0005] The sidewalls of the intermediate battery cells are wrapped by adjacent cells, making it easy for heat to couple and accumulate between the cells, which can easily lead to heat spread. Once local thermal runaway occurs, the heat dissipation efficiency of traditional water-cooled plates is far from sufficient to quickly dissipate a large amount of heat, and cannot effectively prevent the spread of thermal runaway. This can even lead to serious safety accidents such as fire and explosion, posing a significant safety hazard.

[0006] In view of this, we propose a liquid cooling device for solid-state battery modules. Summary of the Invention

[0007] Technical problem to be solved: The purpose of this invention is to provide a liquid cooling device for solid-state battery modules, which solves the technical problems mentioned in the background art.

[0008] Technical solution: The technical solution of the present invention provides a liquid cooling device for a solid-state battery module, comprising a plurality of battery cells; The battery unit includes a solid-state battery cell and a side cooling structure disposed on the side of the solid-state battery cell; The side-cooling structure includes a pump-driven unit and a liquid flow cooling channel. The liquid flow cooling channel contains coolant, and the pump-driven unit is used to drive the coolant to circulate in the liquid flow cooling channel. Multiple sensing units are evenly arranged on the liquid flow cooling channel, and the sensing units are used to sense the temperature of the coolant around them. The sensing unit includes a variable resistor and an elastically extendable control unit, with the free end of the control unit extending into the liquid flow cooling channel and in contact with the coolant. The control unit is provided with a thermosensitive expansion and contraction layer in contact with its free end. The heat energy in the coolant is conducted to the thermosensitive expansion and contraction layer through the free end of the control unit. When the thermosensitive expansion and contraction layer expands due to heat, it drives the free end of the control unit to retract, thus shortening the length of the free end of the control unit extending into the liquid flow cooling channel. The variable resistor is electrically connected to the pump drive unit. The variable resistor includes a resistive element connected to the free end of the sensing unit and a contact spring connected to the fixed end of the sensing unit.

[0009] As an optional solution of the technical solution in this invention document, the side cooling structure further includes two liquid cooling plates that are respectively connected to the side walls of the solid-state battery cell and are arranged symmetrically, and one of the liquid cooling plates is connected to a side guard. A thermal pad is connected to the side wall of the liquid cooling plate, and when the liquid cooling plate is fixedly installed on the side wall of the solid-state battery cell, the thermal pad is in close contact with the surface of the side wall of the solid-state battery cell. A protective cover is connected to the side of the liquid cooling plate away from the heat-conducting pad. The protective cover has an annular heat-conducting pad on the side close to the liquid cooling plate. When the protective cover is fixedly installed on the liquid cooling plate, the annular heat-conducting pad is in close contact with the side wall surface of the liquid cooling plate.

[0010] As an optional solution to the technical solution of this invention, the number of liquid cooling channels is two, and each of the liquid cooling plates is provided with one liquid cooling channel.

[0011] As an optional solution to the technical solution of this invention, the liquid cooling channel further includes an S-shaped cooling channel disposed within the corresponding liquid cooling plate. The coolant fills the interior of the cold flow channel; The cold flow channel is provided with an input port and an output port at its input and output ends, respectively, and both the input port and the output port are connected to the liquid cooling plate and extend from the surface of the liquid cooling plate.

[0012] As an optional solution to the technical solution of this invention document, the pump drive unit includes a connecting pipeline and a liquid storage tank connected to the inner wall of the side baffle. A liquid pump is connected to the lower side wall of the liquid storage tank. The input end of the liquid pump is connected to an inlet pipe, and the output end of the liquid pump extends into the interior of the liquid storage tank. The upper part of the liquid storage tank, away from the liquid pump, is fixedly connected to an outlet pipe; The storage tank, inlet pipe, outlet pipe, and connecting pipe are all filled with coolant.

[0013] As an optional solution to the technical solution of this invention, one end of the connecting pipe is connected to the output port of one of the liquid flow cooling channels, and the other end is connected to the input port of the other liquid flow cooling channel. The end of the liquid outlet pipe furthest from the liquid storage tank is connected to the inlet of one of the liquid flow cooling channels, while the end of the liquid inlet pipe furthest from the liquid pump is connected to the outlet of the other liquid flow cooling channel.

[0014] As an optional solution to the technical solution of this invention, the control device further includes a heat-insulating cover connected to the end of the inner cavity of the protective cover. A side protrusion is connected to the inner wall of the heat insulation cover; A heat-conducting rod is sealed and inserted at the end of the heat insulation cover. The heat-conducting rod is covered with a heat insulation sleeve that is inserted and fixed inside the liquid cooling plate. One end of the heat-conducting rod extends into the cold flow channel, and the other end extends into the inner cavity of the heat insulation cover. A forced piston, which is sealed and slides within the inner cavity of the heat-conducting rod, is fixed to the outer periphery of the heat-conducting rod. A return spring is connected to the end of the forced piston, and the end of the return spring away from the forced piston is connected to the end of the inner cavity of the protective cover. A heat-conducting rod is also connected to the side wall at one end of the heat-conducting rod that extends into the inner cavity of the heat-insulating cover.

[0015] As an optional solution of the technical solution in this invention document, the thermosensitive expansion and contraction layer is filled in the inner cavity of the heat insulation shell, and the forced piston is located between the thermosensitive expansion and contraction layer and the return spring, and the heat-inducing thin rod is located inside the thermosensitive expansion and contraction layer; One end of the heat insulation sleeve is connected to the end of the heat insulation cover, and the other end is flush with the bottom wall of the cold flow channel cavity. When the end of the forced piston abuts against the end of the side protrusion, the end of the heat-conducting rod is flush with the end of the heat insulation sleeve.

[0016] As an optional solution to the technical solution of this invention, the fixed end of the contact spring is connected to the side wall of the side protrusion. The free end of the contact spring elastically abuts against the surface of the resistive element; The resistive element is a resistance wire that is spirally coiled and fixed around the outer periphery of the heat-conducting rod.

[0017] As an optional solution to the technical solution of this invention, the liquid pump in the pump drive unit is connected in series with the multiple variable resistors.

[0018] Beneficial effects: One or more technical solutions provided in this invention have at least the following technical effects or advantages: 1. When this solid-state battery module is running, it can independently liquid cool each solid-state battery cell by setting a side cooling structure on each solid-state battery cell. It can directly and efficiently dissipate and cool the heat generated by a single battery cell, avoiding heat conduction between the battery cells that make up the solid-state battery module, thereby blocking the basis for heat accumulation from the path.

[0019] 2. Furthermore, the side-cooling structure not only provides individual liquid cooling for solid-state battery cells but also monitors the temperature of different parts of the sidewall surface of the solid-state battery cells in real time. When a local area on the surface of a single solid-state battery cell is found to be too hot, the flow rate of the coolant in the high-temperature area can be dynamically adjusted to adjust the heat exchange intensity for different heat dissipation areas of the solid-state battery cell, quickly removing accumulated heat. Dynamic liquid cooling adjustment can quickly eliminate hot spots in a single cell, specifically blocking heat transfer paths, achieving a balance between temperature differences between battery cells, avoiding the coupling and accumulation of heat within the entire solid-state battery module, greatly reducing the probability of thermal runaway propagation in the solid-state battery module, and improving the reliability and safety of solid-state battery operation.

[0020] 3. While protecting the liquid cooling plate through the protective cover in the side cooling structure, it can also assist the liquid cooling plate in heat dissipation, quickly and evenly spreading the heat on the surface of the protective cover to the entire surface of the protective cover and dissipating it into the environment, which helps to further improve the heat dissipation and cooling effect on the hot spot area on the surface of a single solid-state battery cell.

[0021] 4. Multiple sensing units evenly arranged on the liquid flow cooling channel independently monitor the temperature of the surrounding coolant in different zones. When the temperature in a certain local area is too high, the heat energy in the coolant is transferred through the heat-conducting rod in the sensing unit in that zone to the thermosensitive expansion layer in each sensing unit, driving the free end of the sensing unit to retract. This widens the cross-sectional area of ​​the channel in the overheated area of ​​the cooling channel, increasing the coolant flow rate and heat transfer intensity in that overheated area, which helps to quickly remove locally accumulated heat. At the same time, the cross-sectional area of ​​the channel in the low-temperature area remains unchanged to avoid overcooling. This point-to-point precise control can keep the temperature difference between different areas of the solid-state battery sidewall within a small range, effectively meeting the high-efficiency heat dissipation requirements of the solid-state battery module. It also helps to solve the problem of the uniform convection heat transfer of the traditional water-cooled plate for solid-state batteries, where the heat dissipation intensity cannot be adjusted according to the heat load difference of different areas of the sidewall, resulting in "insufficient heat dissipation in the high-temperature area and overcooling in the low-temperature area". This not only affects the heat dissipation effect, but also causes internal thermal stress in the battery due to the excessive temperature difference of the sidewall, accelerating structural failure.

[0022] 5. Through precise point-to-point control, the temperature difference between different areas of the solid-state battery sidewall can be kept within a small range, avoiding the situation of "insufficient heat dissipation in high-temperature areas and excessive cooling in low-temperature areas" that occurs with traditional liquid cooling. This effectively prevents significant thermal stress from excessive temperature differences between high-temperature and low-temperature areas in solid-state battery cells, which could lead to battery casing deformation or even electrode delamination in the solid electrolyte inside the battery. This effectively extends the cycle life of solid-state battery cells, thereby extending the lifespan of solid-state battery modules and further improving the reliability of solid-state battery operation.

[0023] 6. When a localized area within the liquid flow cooling channel overheats, the cross-sectional area of ​​the channel within that overheated region increases. This enhances the coolant flow rate and heat exchange intensity within the overheated region. Simultaneously, as the heat-conducting rod in the sensing unit retracts, the moving heat-conducting rod drives the connected resistor to move, causing a decrease in the resistance value in the circuit where the liquid pump is located. This increases the power adaptability of the liquid pump and further enhances the flow rate of the coolant within the overheated region of the liquid flow cooling channel. This dual effect of "increased channel cross-sectional area + increased flow rate" widens the cross-sectional area through which the fluid passes and accelerates the flow rate of the coolant. Consequently, when localized hot spots appear on the surface of the solid-state battery module, the high temperature in the hot spot area can be reduced in a short time. This quickly prevents the "heat accumulation" of localized hot spots in the solid-state battery, ensuring the reliability and safety of the solid-state battery module operation.

[0024] 7. By increasing the power adaptability of the liquid pump, the dual effects of "increased channel cross-sectional area + increased flow rate" are achieved. When local hot spots appear on the surface of the solid battery in the solid battery module, the high temperature in the hot spot area can be reduced in a short time in a targeted and efficient manner. At the same time, the "indiscriminate full load operation" situation caused by the traditional uniform heat dissipation process can be effectively avoided, thus effectively saving the power consumed by the solid battery module during operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the battery cell structure in this invention.

[0027] Figure 3 For the present invention Figure 2 A magnified view of part A in the diagram.

[0028] Figure 4 This is a side view of the three-dimensional structure of the battery cell in this invention.

[0029] Figure 5 For the present invention Figure 4 A magnified view of part B in the diagram.

[0030] Figure 6 For the present invention Figure 4 A magnified view of part C in the diagram.

[0031] Figure 7 This is a schematic diagram of the liquid cooling plate in this invention.

[0032] Figure 8 For the present invention Figure 7 A magnified view of part D in the middle.

[0033] Figure 9 This is a partial cross-sectional view of the battery cell in this invention.

[0034] Figure 10 This is a cross-sectional view of the side-cooling structure in this invention.

[0035] Figure 11 For the present invention Figure 10 A magnified view of part E in the middle.

[0036] Figure 12 For the present invention Figure 11 A magnified view of part F in the middle section.

[0037] Figure 13 For the present invention Figure 11 A magnified view of part G in the middle.

[0038] Explanation of the labels in the diagram: 100. Battery cell; 101. Solid-state battery cell; 201. Liquid-cooled plate; 202. Protective cover; 203. Side guard; 204. Liquid reservoir; 205. Liquid pump; 206. Liquid inlet pipe; 207. Liquid outlet pipe; 208. Connecting pipe; 209. Cold runner; 211. Coolant; 212. Heat-conducting rod; 213. Thermosensitive expansion and contraction layer; 214. Heat-drawing rod; 215. Forced piston; 216. Return spring; 217. Heat insulation cover; 218. Side protrusion; 219. Resistor; 220. Contact spring; 221. Heat insulation sleeve. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Reference Figures 1 to 13 This invention provides a liquid cooling device for a solid-state battery module, comprising a plurality of battery cells 100; The battery cell 100 includes a solid-state battery cell 101 and a side cooling structure disposed on the side of the solid-state battery cell 101; The side-cooling structure includes a pump drive unit and a liquid flow cooling channel. The liquid flow cooling channel includes coolant 211, and the pump drive unit is used to drive the coolant 211 in the liquid flow cooling channel to circulate. Multiple sensing units are evenly arranged on the liquid flow cooling channel, and the sensing units are used to sense the temperature of the coolant around them. The coolant 211 is preferably an antifreeze coolant. The sensing unit includes a variable resistor and an elastically extendable control unit. The free end of the control unit extends into the liquid flow cooling channel and contacts the coolant 211. The control unit is provided with a thermosensitive expansion and contraction layer 213 that contacts its free end. The thermosensitive expansion and contraction layer 213 is a thermosensitive paraffin wax, and the deformation temperature of the thermosensitive paraffin wax is 35-55℃. The heat energy in the coolant 211 is conducted to the thermosensitive expansion and contraction layer 213 through the free end of the control unit. When the thermosensitive expansion and contraction layer 213 is heated and expands, it drives the free end of the control unit to retract, and the length of the free end of the control unit extending into the liquid flow cooling channel becomes shorter. The variable resistor is electrically connected to the pump drive unit. The variable resistor includes a resistive element 219 connected to the free end of the sensing unit and a contact spring 220 connected to the fixed end of the sensing unit.

[0043] When this solid-state battery module is in operation, each solid-state battery cell 101 can be independently liquid cooled by the side cooling structure set on each solid-state battery cell 101. This can directly and efficiently dissipate and cool the heat generated by a single battery cell, avoiding heat conduction between the battery cells that make up the solid-state battery module, thereby blocking the basis for heat accumulation.

[0044] Furthermore, while the side-cooling structure provides individual liquid cooling for each solid-state battery cell 101, it can also monitor the temperature of different parts of the sidewall surface of the solid-state battery cell 101 in real time. When it detects that the temperature of a certain local area on the surface of a single solid-state battery cell 101 is too high, it can dynamically adjust the flow rate of the coolant in the high-temperature area and adjust the heat exchange intensity for different heat dissipation areas of the solid-state battery cell 101 to quickly remove the accumulated heat. Dynamic liquid cooling adjustment can quickly eliminate hot spots in a single cell, specifically block the heat transfer path, achieve a balance between the temperature differences between each battery cell, avoid the coupling and accumulation of heat in the entire solid-state battery module, greatly reduce the probability of thermal runaway propagation in the solid-state battery module, and improve the reliability and safety of solid-state battery operation.

[0045] Reference Figures 1 to 7 The present invention provides a liquid cooling device for a solid-state battery module. The side cooling structure further includes two liquid cooling plates 201 that are respectively connected to the side walls of the solid-state battery cell 101 and arranged symmetrically. One of the liquid cooling plates 201 is connected to a side guard 203. There are two liquid flow cooling channels, and each liquid cooling plate 201 is provided with a liquid flow cooling channel. A thermal pad is connected to the side wall of the liquid cooling plate 201, and when the liquid cooling plate 201 is fixedly installed on the side wall of the solid-state battery cell 101, the thermal pad is in close contact with the side wall surface of the solid-state battery cell 101. The liquid cooling plate 201, the protective cover 202 and the side guard 203 are preferably made of aluminum alloy material with good thermal conductivity. A protective cover 202 is connected to the side of the liquid cooling plate 201 away from the heat-conducting pad. The protective cover 202 is provided with an annular heat-conducting pad on the side of the liquid cooling plate 201. When the protective cover 202 is fixedly installed on the liquid cooling plate 201, the annular heat-conducting pad is in close contact with the side wall surface of the liquid cooling plate 201.

[0046] While protecting the liquid cooling plate 201 through the protective cover 202 in the side cooling structure, it can also assist the liquid cooling plate 201 in heat dissipation, quickly and evenly spreading the heat on the surface of the protective cover 202 to the entire surface of the protective cover 202 and dissipating it into the environment, which helps to further improve the heat dissipation and cooling effect on the hot spot area on the surface of the single solid-state battery cell 101.

[0047] Reference Figures 4 to 8 This invention provides a liquid cooling device for a solid-state battery module. The liquid flow cooling channel further includes an S-shaped cold flow channel 209 disposed within the corresponding liquid cooling plate 201. Coolant 211 fills the interior of the cold flow channel 209; The cold flow channel 209 has an input port and an output port on its input and output ends, respectively, and both the input port and the output port are connected to the liquid cooling plate 201 and extend from the surface of the liquid cooling plate 201.

[0048] Reference Figures 2 to 5 , Figure 7 The present invention provides a liquid cooling device for a solid-state battery module. The pump drive unit includes a connecting pipe 208 and a liquid storage tank 204 connected to the inner wall of the side guard 203. A liquid pump 205 is connected to the lower side wall of the liquid storage tank 204, and the liquid pump 205 in the pump drive unit is connected in series with multiple variable resistors. An inlet pipe 206 is connected to the input end of the liquid pump 205, and the output end of the liquid pump 205 extends into the interior of the liquid storage tank 204. The upper part of the liquid storage tank 204, away from the liquid pump 205, is fixedly connected to the liquid outlet pipe 207; The liquid storage tank 204, the liquid inlet pipe 206, the liquid outlet pipe 207, and the connecting pipe 208 are all filled with coolant 211.

[0049] One end of the connecting pipe 208 is connected to the output port of one of the liquid flow cooling channels, and the other end is connected to the input port of another liquid flow cooling channel. The end of the liquid outlet pipe 207 away from the liquid storage tank 204 is connected to the inlet of one of the liquid flow cooling channels, while the end of the liquid inlet pipe 206 away from the liquid pump 205 is connected to the outlet of the other liquid flow cooling channel.

[0050] Reference Figures 7 to 13 The present invention provides a liquid cooling device for a solid-state battery module, and the control panel further includes a heat insulation cover 217 connected to the end of the inner cavity of the protective cover 202. A side protrusion 218 is connected to the inner wall of the heat insulation cover 217. The fixed end of the contact spring 220 is connected to the side wall of the side protrusion 218, and the free end of the contact spring 220 elastically abuts against the surface of the resistor 219. A heat-conducting rod 212 is sealed and inserted at the end of the heat insulation cover 217. A heat insulation sleeve 221, which is inserted and fixed inside the liquid cooling plate 201, is fitted over the heat-conducting rod 212. One end of the heat-conducting rod 212 extends into the cold flow channel 209, and the other end extends into the inner cavity of the heat insulation cover 217. The resistor 219 is preferably a resistance wire spirally wound and fixed around the outer periphery of the heat-conducting rod 212. Both the heat insulation sleeve 221 and the heat insulation cover 217 have insulation... Made of thermal material, the heat insulation sleeve 221 fitted around the heat-conducting rod 212 can effectively block and isolate the heat energy transmitted from the liquid cooling plate 201 to the heat-conducting rod 212. This prevents the heat energy contained in the coolant 211 inside the cold flow channel 209 from being interfered with by the heat energy transmitted from the liquid cooling plate 201 when the heat-conducting rod 212 is transferred to the heat-sensitive expansion and contraction layer 213, thereby improving the accuracy of the monitoring of the coolant 211 water temperature. A forced piston 215, which is sealed and slides within the inner cavity of the heat insulation cover 217, is fixedly sleeved around the heat-conducting rod 212. A return spring 216 is connected to the end of the forced piston 215, and the end of the return spring 216 away from the forced piston 215 is connected to the end of the inner cavity of the protective cover 202. A heat-conducting rod 214 is also connected to the side wall of one end of the heat-insulating cover 217 that extends into the inner cavity of the heat-conducting rod 212. The thermal expansion layer 213 is filled in the inner cavity of the heat insulation cover 217, and the forced piston 215 is located between the thermal expansion layer 213 and the return spring 216, and the heat-inducing thin rod 214 is located inside the thermal expansion layer 213. One end of the heat insulation sleeve 221 is connected to the end of the heat insulation cover 217, and the other end is flush with the bottom wall of the inner cavity of the cold flow channel 209. When the end of the forced piston 215 abuts against the end of the side protrusion 218, the end of the heat-conducting rod 212 is flush with the end of the heat insulation sleeve 221.

[0051] Multiple sensing units evenly arranged on the liquid flow cooling channel independently monitor the temperature of the surrounding coolant in different zones. When the temperature in a certain local area is too high, the heat energy in the coolant is transferred through the heat-conducting rod 212 in the sensing unit in that zone to the thermal expansion and contraction layer 213 in each sensing unit, driving the free end of the sensing unit to retract. This widens the cross-sectional area of ​​the channel in the overheated area of ​​the cooling channel, increases the coolant flow rate and heat transfer intensity in the overheated area, and helps to quickly remove the locally accumulated heat. At the same time, the cross-sectional area of ​​the channel in the low-temperature area remains unchanged to avoid overcooling. This point-to-point precise control can keep the temperature difference between different areas of the solid-state battery sidewall within a small range, effectively meeting the high-efficiency heat dissipation requirements of the solid-state battery module. It also helps to solve the problem of the uniform convection heat transfer of the traditional water-cooled plate for solid-state batteries, where the heat dissipation intensity cannot be adjusted according to the heat load difference of different areas of the sidewall, resulting in the problem of "insufficient heat dissipation in the high-temperature area and overcooling in the low-temperature area". This not only affects the heat dissipation effect, but also causes internal thermal stress in the battery due to the excessive temperature difference of the sidewall, accelerating structural failure.

[0052] By precisely controlling the temperature difference between different areas of the solid-state battery sidewall, the temperature difference can be kept within a small range, avoiding the situation of "insufficient heat dissipation in high-temperature areas and excessive cooling in low-temperature areas" that occurs when traditional liquid cooling is used. This effectively prevents the solid-state battery cell 101 from generating significant thermal stress due to the large temperature difference between the high-temperature and low-temperature areas, which could lead to deformation of the battery casing or even electrode delamination of the solid electrolyte inside the battery. This effectively extends the cycle life of the solid-state battery cell 101, thereby extending the life of the solid-state battery module and further improving the reliability of solid-state battery operation.

[0053] When a localized area within the liquid flow cooling channel overheats, the cross-sectional area of ​​the channel within that overheated area increases. This enhances the flow rate and heat exchange intensity of the coolant within the overheated area. Simultaneously, as the heat-conducting rod 212 in the sensing unit retracts, the moving heat-conducting rod 212 drives the connected resistor 219 to move, causing a decrease in the resistance value in the circuit containing the liquid pump 205. This increases the power adaptability of the liquid pump 205 and further enhances the flow rate of the coolant within the overheated area of ​​the liquid flow cooling channel. This dual effect of "increased channel cross-sectional area + increased flow rate" both widens the cross-sectional area of ​​the fluid passage and accelerates the flow rate of the coolant. Consequently, when localized hot spots appear on the surface of the solid-state battery module, the high temperature in the hot spot area can be reduced in a short time. This quickly prevents the "heat accumulation" of localized hot spots in the solid-state battery, ensuring the reliability and safety of the solid-state battery module operation.

[0054] By increasing the power adaptability of the liquid pump 205, the dual effects of "increased channel cross-sectional area + increased flow rate" are achieved. When local hot spots appear on the surface of the solid battery in the solid battery module, the high temperature in the hot spot area can be reduced in a short time in a targeted and efficient manner. At the same time, the "indiscriminate full load operation" situation caused by the traditional uniform heat dissipation process can be effectively avoided, thus effectively saving the power consumed by the solid battery module during operation.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid cooling device for a solid-state battery module, characterized in that: Includes several battery cells (100); The battery cell (100) includes a solid-state battery cell (101) and a side cooling structure disposed on the side of the solid-state battery cell (101); The side cooling structure includes a pump drive unit and a liquid flow cooling channel. The liquid flow cooling channel includes coolant (211), and the pump drive unit is used to drive the coolant (211) in the liquid flow cooling channel to circulate. Multiple sensing units are evenly arranged on the liquid flow cooling channel, and the sensing units are used to sense the temperature of the coolant around them. The sensing unit includes a variable resistor and an elastically extendable control unit, and the free end of the control unit extends into the liquid flow cooling channel and is in contact with the coolant (211). The control unit is provided with a thermosensitive expansion and contraction layer (213) in contact with its free end. The heat energy in the coolant (211) is conducted to the thermosensitive expansion layer (213) through the free end of the control unit. When the thermosensitive expansion layer (213) is heated and expands, it drives the free end of the control unit to retract, and the length of the free end of the control unit extending into the liquid flow cooling channel becomes shorter. The variable resistor is electrically connected to the pump drive unit. The variable resistor includes a resistive element (219) connected to the free end of the sensing unit and a contact spring (220) connected to the fixed end of the sensing unit.

2. The liquid cooling device for solid-state battery modules according to claim 1, characterized in that: The side cooling structure also includes two liquid cooling plates (201) that are respectively connected to the side walls of the solid-state battery cell (101) and arranged symmetrically, and one of the liquid cooling plates (201) is connected to a side guard (203). A thermal pad is connected to the side wall of the liquid cooling plate (201), and when the liquid cooling plate (201) is fixedly installed on the side wall of the solid-state battery cell (101), the thermal pad is in close contact with the side wall surface of the solid-state battery cell (101). A protective cover (202) is connected to the side of the liquid cooling plate (201) away from the heat-conducting pad. The protective cover (202) is provided with an annular heat-conducting pad on the side of the liquid cooling plate (201). When the protective cover (202) is fixedly installed on the liquid cooling plate (201), the annular heat-conducting pad is in close contact with the side wall surface of the liquid cooling plate (201).

3. The liquid cooling device for solid-state battery modules according to claim 2, characterized in that: There are two liquid cooling channels, and each of the liquid cooling plates (201) is provided with one liquid cooling channel.

4. The liquid cooling device for solid-state battery modules according to claim 3, characterized in that: The liquid flow cooling channel also includes an S-shaped cold flow channel (209) disposed within the corresponding liquid cooling plate (201). The coolant (211) fills the interior of the cold flow channel (209); The cold flow channel (209) has an input port and an output port on its input and output ends, respectively, and both the input port and the output port are connected to the liquid cooling plate (201) and extend from the surface of the liquid cooling plate (201).

5. The liquid cooling device for solid-state battery modules according to claim 4, characterized in that: The pump drive unit includes a connecting pipe (208) and a liquid storage tank (204) connected to the inner wall of the side guard (203). A liquid pump (205) is connected to the lower side wall of the liquid storage tank (204). An inlet pipe (206) is connected to the input end of the liquid pump (205), and the output end of the liquid pump (205) extends into the interior of the liquid storage tank (204). The upper part of the liquid storage tank (204) away from the liquid pump (205) is fixedly connected to the liquid outlet pipe (207). The liquid storage tank (204), the liquid inlet pipe (206), the liquid outlet pipe (207), and the connecting pipe (208) are all filled with coolant (211).

6. The liquid cooling device for solid-state battery modules according to claim 5, characterized in that: One end of the connecting pipe (208) is connected to the output port of one of the liquid flow cooling channels, and the other end is connected to the input port of the other liquid flow cooling channel. The end of the liquid outlet pipe (207) away from the liquid storage tank (204) is connected to the inlet of one of the liquid flow cooling channels, while the end of the liquid inlet pipe (206) away from the liquid pump (205) is connected to the outlet of the other liquid flow cooling channel.

7. The liquid cooling device for solid-state battery modules according to claim 4, characterized in that: The control unit also includes a heat insulation cover (217) connected to the end of the inner cavity of the protective cover (202). A side protrusion (218) is connected to the inner wall of the heat insulation cover (217). A heat-conducting rod (212) is sealed and inserted at the end of the heat insulation shell (217). The heat-conducting rod (212) is covered with a heat insulation sleeve (221) that is inserted and fixed inside the liquid cooling plate (201). One end of the heat-conducting rod (212) extends into the cold flow channel (209), and the other end extends into the inner cavity of the heat insulation shell (217). A forced piston (215) is fixedly fitted around the outer periphery of the heat-conducting rod (212) and slides within the inner cavity of the heat insulation cover (217). A return spring (216) is connected to the end of the forced piston (215), and the end of the return spring (216) away from the forced piston (215) is connected to the end of the inner cavity of the protective cover (202); The heat-conducting rod (212) is inserted into the inner cavity of the heat insulation cover (217) and a heat-conducting thin rod (214) is also connected to the side wall.

8. The liquid cooling device for solid-state battery modules according to claim 7, characterized in that: The thermosensitive expansion layer (213) is filled in the inner cavity of the heat insulation cover (217), and the forced piston (215) is located between the thermosensitive expansion layer (213) and the return spring (216), and the heat-conducting thin rod (214) is located inside the thermosensitive expansion layer (213); One end of the heat insulation sleeve (221) is connected to the end of the heat insulation cover (217), and the other end is flush with the bottom wall of the inner cavity of the cold flow channel (209). When the end of the forced piston (215) abuts against the end of the side protrusion (218), the end of the heat-conducting rod (212) is flush with the end of the heat insulation sleeve (221).

9. The liquid cooling device for solid-state battery modules according to claim 7, characterized in that: The fixed end of the contact spring (220) is connected to the side wall of the side protrusion (218); The free end of the contact spring (220) elastically abuts against the surface of the resistor (219); The resistor (219) is a resistance wire that is spirally coiled and fixed around the outer periphery of the heat-conducting rod (212).

10. The liquid cooling device for solid-state battery modules according to claim 5, characterized in that: The liquid pump (205) in the pump drive unit is connected in series with the plurality of the variable resistors.

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