A high-safety solid-state lithium-ion battery that prevents thermal runaway

Abstract

This invention relates to the field of battery technology, specifically to a high-safety solid-state lithium-ion battery that prevents thermal runaway. The battery includes a positive electrode material, a negative electrode material, and a solid electrolyte disposed between the positive and negative electrode materials. The solid electrolyte contains a weak layer, and separation pushers are symmetrically arranged on the upper and lower sides of the weak layer. By squeezing and cutting the weak layer with the separation pushers, the solid electrolyte can be split into two parts, creating an insulating gap between them. When the battery is detected to exceed the safe temperature threshold for thermal runaway, this invention uses the separation pushers in conjunction with the weak layer to separate the solid electrolyte, creating an insulating gap in the middle of the solid electrolyte and reducing the risk of thermal runaway.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a high-safety solid-state lithium-ion battery that prevents thermal runaway. Background Technology

[0002] Solid-state lithium-ion batteries are lithium-ion batteries that use a solid electrolyte instead of a traditional liquid electrolyte. They represent a significant direction in the development of lithium-ion battery technology. While the basic structure of a solid-state lithium-ion battery still includes a positive electrode, a negative electrode, and an electrolyte, the core difference lies in the solid state of the electrolyte, which completely replaces the traditional liquid electrolyte and separator. Although solid-state lithium-ion batteries can block lithium dendrite growth and reduce the risk of thermal runaway through the solid electrolyte, it is not entirely eliminated. Excessively high interfacial impedance can lead to localized heat concentration, becoming a trigger point for thermal runaway. When the rate of heat generation exceeds the rate of heat dissipation, and the material undergoes a chain reaction of exothermic reactions at high temperatures, the risk of thermal runaway also exists. In some applications with extremely high safety requirements, it is necessary to further enhance the protection against thermal runaway. Summary of the Invention

[0003] The purpose of this invention is to provide a high-safety solid-state lithium-ion battery that prevents thermal runaway, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-safety solid-state lithium-ion battery that prevents thermal runaway, comprising a positive electrode material, a negative electrode material, and a solid electrolyte disposed between the positive electrode material and the negative electrode material. The solid electrolyte is provided with a weak layer, and separation pushers are symmetrically arranged on the upper and lower sides of the weak layer. By squeezing and cutting the weak layer with the separation pushers, the solid electrolyte can be split into two parts, and an insulating gap is generated between the two parts.

[0005] The positive electrode material and the negative electrode material are respectively provided with current collectors on the side away from the solid electrolyte. A compression through hole is opened through the current collector, so that the current collector can be compressed to adapt to the displacement when the solid electrolyte splits and gaps are generated.

[0006] The positive electrode material, negative electrode material, solid electrolyte, and separator pusher are externally packaged with an alloy encapsulation shell. A gas cavity interlayer is formed on one side of the alloy encapsulation shell. A portion of the separator pusher has through-holes for flow channels. Through the separator pusher, flow channels, and compression through-holes, a gas undulating flow channel is formed that can pass through all the compression through-holes in sequence.

[0007] The upper part of the air cavity interlayer is connected to an upper connecting groove, and the lower part of the air cavity interlayer is connected to a bottom connecting air passage. The air cavity interlayer is connected to one end of the gas vortex flow channel through the upper connecting groove, and the air cavity interlayer is connected to the other end of the gas vortex flow channel through the bottom connecting air passage.

[0008] The surface of the alloy encapsulation shell is provided with a corrugated heat dissipation surface, which is positioned corresponding to the air cavity interlayer. The corrugated heat dissipation surface dissipates heat from the air cavity interlayer, and the heat dissipation from the corrugated heat dissipation surface creates a temperature difference between the upper and lower parts of the gas in the air cavity interlayer. The temperature difference drives the gas to circulate in the air cavity interlayer and the gas folding flow channel.

[0009] The alloy encapsulation shell is equipped with a synchronization plate inside, and the separation pushers are all fixedly mounted on the synchronization plate.

[0010] The surface of the alloy encapsulation shell has a through hole, and a pushing platform is provided in the through hole. The pushing platform is integrally fixed with the synchronization plate.

[0011] A weak sealing ring is provided between the extrusion platform and the through hole of the housing. When the extrusion platform is subjected to a pressure exceeding a set threshold, the weak sealing ring will break, causing the synchronous plate to drive the separation pusher to extrude and cut the weak layer.

[0012] A compressed air chamber is provided in the air chamber interlayer. A cross control part is provided on the outside of the compressed air chamber. A cut-off flow channel is opened in the cross control part and is connected to the inner cavity of the compressed air chamber. The compressed air chamber stores compressed gas inside. When the compressed gas inside the compressed air chamber is released to the outside through the cut-off flow channel, the gas expands and does work, and the temperature decreases.

[0013] The shell through hole is also provided with a transverse cavity, which cuts the flow channel into two parts. A sealing plug shaft is provided inside the transverse cavity. The sealing plug shaft is in sealing contact with the inner wall surface of the transverse cavity. The flow channel is blocked by the sealing plug shaft, so that the flow channel is in a normally closed state.

[0014] One end of the sealing plug shaft is provided with a side spring, and the other end of the sealing plug shaft is provided with a hot melt push rod. The side spring applies elastic pressure to the sealing plug shaft, causing the sealing plug shaft to tend to move in the direction of the hot melt push rod. The hot melt push rod limits the sealing plug shaft. When the battery temperature exceeds a set threshold, the hot melt push rod melts, causing the sealing plug shaft to move axially, at which point the flow channel is cut off and opened.

[0015] The cross control section is provided with an overflow groove, which is connected to the cross cavity, through which the molten hot melt push rod is discharged.

[0016] The cross control unit also has a drive chamber, in which a piston is provided. The piston is in sealed contact with the drive chamber. A movable rod is fixedly provided on the piston, and a sealing pressure plate is fixedly provided at the other end of the movable rod.

[0017] The air chamber interlayer is fixedly provided with a mating plate, and the sealing plate is provided with a supporting spring. The supporting spring applies elastic pressure to the sealing plate, so that the sealing plate has a tendency to move away from the mating plate. When the cut-off flow channel is opened, the compressed gas in the compressed air chamber drives the piston to move, so that the sealing plate and the mating plate are squeezed together, dividing the air chamber interlayer into upper and lower parts.

[0018] One side of the drive chamber is connected to an air supply pipe, and the other end of the air supply pipe is connected to the lower surface of the sealing plate. When the sealing plate and the mating plate are pressed together to separate the air chamber interlayer into upper and lower parts, the gas in the drive chamber can enter the lower half of the air chamber interlayer after separation through the air supply pipe.

[0019] The surface of the air chamber interlayer has a normally closed exhaust port extending outwards. The normally closed exhaust port is located in the upper half of the air chamber interlayer after separation. A normally closed blocking block is fixedly installed on the sealing pressure plate. Initially, the normally closed blocking block seals and closes the normally closed exhaust port. When the sealing pressure plate and the mating plate are pressed together, the normally closed blocking block and the normally closed exhaust port are misaligned and separated, so that the normally closed exhaust port is connected to the upper half of the air chamber interlayer after separation.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The solid-state lithium-ion battery of this invention can separate the solid electrolyte by separating the pusher sheet and the weak layer when the battery is detected to exceed the safe temperature threshold for thermal runaway. This creates an insulating gap in the solid electrolyte, disconnecting the connection between the positive and negative electrodes through the solid electrolyte. Its core function is to cut off the ion conduction path, preventing ions from migrating and terminating the electrochemical reaction between the positive and negative electrodes, thus reducing the risk of thermal runaway.

[0022] This invention, through the structural design of compression through holes, flow channel through holes, and air cavity interlayer, can utilize temperature difference to drive airflow to circulate in the air cavity interlayer and compression through holes. Heat is evenly distributed through airflow circulation, which is more efficient than the pure heat conduction method in traditional solid-state batteries. This results in higher overall temperature uniformity of the battery, reduces the generation of local hot spots, and lowers the risk of thermal runaway.

[0023] This invention, through the combination of a compressed air chamber, a cross-shaped control section, and a sealed pressure plate, can automatically divide the air chamber interlayer into upper and lower parts when the battery's thermal runaway temperature reaches a certain level. The gas in the compressed air chamber is then injected into the lower part of the air chamber interlayer, accelerating the gas flow in the compression through-hole. At the same time, due to the sudden expansion of the compressed gas and its work done on the outside, its internal energy decreases, reaching sub-zero temperatures. The low-temperature gas enters the battery's compression through-hole for circulation, which can forcibly cool the battery and further reduce the risk of thermal runaway. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a three-dimensional half-sectional schematic diagram of the present invention.

[0026] Figure 3 This is a partial three-dimensional cross-sectional view of the present invention.

[0027] Figure 4 This is a partial structural illustration of the present invention.

[0028] Figure 5 This is a three-dimensional half-section front view of the present invention.

[0029] Figure 6 This is a three-dimensional half-section diagram of the air cavity interlayer.

[0030] Figure 7 This is a three-dimensional half-section front view of the cross control section of the present invention.

[0031] In the diagram: 1. Positive electrode material; 2. Negative electrode material; 3. Solid electrolyte; 4. Weak layer; 5. Separation pusher; 6. Current collector; 7. Compression through-hole; 8. Alloy encapsulation shell; 9. Gas cavity interlayer; 10. Flow channel through-hole; 11. Upper connecting groove; 12. Bottom connecting gas path; 13. Corrugated heat dissipation surface; 801. Synchronization plate; 802. Shell through-hole; 803. Pushing platform; 804. Weak sealing ring; 901. Compression 902. Air chamber; 903. Cross control section; 904. Cut-off flow channel; 905. Transverse cut-off chamber; 906. Sealing plug shaft; 907. Side end spring; 908. Hot melt push rod; 909. Overflow groove; 910. Drive chamber; 911. Piston section; 912. Movable rod; 913. Sealing pressure plate; 914. Matching platform; 915. Support spring; 916. Air supply pipe; 917. Normally closed plug; 918. Normally closed exhaust port. Detailed Implementation

[0032] 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, and 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.

[0033] Please see Figures 1 to 7This invention provides a technical solution: a high-safety solid-state lithium-ion battery that prevents thermal runaway, comprising a positive electrode material 1, a negative electrode material 2, and a solid electrolyte 3 disposed between the positive electrode material 1 and the negative electrode material 2. A weak layer 4 is disposed in the solid electrolyte 3, and separation pushers 5 are symmetrically disposed on the upper and lower sides of the weak layer 4. By squeezing and cutting the weak layer 4 with the separation pushers 5, the solid electrolyte 3 can be split into two parts, and an insulating gap is generated between the two parts. The placement of the weak layer 4 is adapted according to the material of the solid electrolyte 3. If the solid electrolyte 3 is a sulfide electrolyte, such as LPS, the weak layer 4 can be made by doping LPS with 1-3% In2S3: After In³⁺ replaces part of P³⁺, the local lattice distortion increases, and the fracture toughness decreases from 0.5 MPa・m¹ / ² to 0.2 MPa・m¹ / ², but the ionic conductivity remains on the order of 10⁻³ S / cm, close to that of the main body. When the solid electrolyte 3 separates through the weak layer 4, the positive electrode material 1 and the negative electrode material 2 can respectively play a supporting role, reducing the probability of the solid electrolyte 3 breaking.

[0034] The solid-state lithium-ion battery of this invention also includes a temperature sensor for temperature monitoring.

[0035] On the side of the positive electrode material 1 and the negative electrode material 2 away from the solid electrolyte 3, there are current collectors 6 respectively. A compression through hole 7 is opened through the current collector 6. The current collector 6 can be compressed through the compression through hole 7 to adapt to the displacement when the solid electrolyte 3 splits and gaps are generated. The compression through hole 7 can deform when the current collector 6 is squeezed, and can also allow gas to flow during normal use, so as to achieve uniform temperature distribution.

[0036] The current collector 6 is made of copper sheet with a compression through hole 7 inside. During the battery manufacturing process, a rolling operation is required to ensure a tight bond between materials such as electrodes. In this process, to prevent the compression through hole 7 from collapsing and deforming, a filler can be preset in the compression through hole 7 to support and protect it during the rolling process. The compression through hole 7 can be filled with metal wire, and the metal wire can be pulled out after the rolling process.

[0037] The positive electrode material 1, negative electrode material 2, solid electrolyte 3 and separation pusher 5 are externally packaged with an alloy encapsulation shell 8. A gas cavity interlayer 9 is opened on one side of the alloy encapsulation shell 8. A flow channel through hole 10 is opened through a part of the separation pusher 5. Through the separation pusher 5, the flow channel through hole 10 and the compression through hole 7, a gas undulating flow channel that can pass through all the compression through holes 7 in sequence is formed.

[0038] The upper part of the air cavity interlayer 9 is connected by an upper connecting groove 11, and the lower part of the air cavity interlayer 9 is connected by a bottom connecting air passage 12. The air cavity interlayer 9 is connected to one end of the gas vortex flow channel through the upper connecting groove 11, and the air cavity interlayer 9 is connected to the other end of the gas vortex flow channel through the bottom connecting air passage 12.

[0039] The surface of the alloy encapsulation shell 8 is provided with a corrugated heat dissipation surface 13, the position of which corresponds to the air cavity interlayer 9. The air cavity interlayer 9 is cooled by the corrugated heat dissipation surface 13. The heat dissipation by the corrugated heat dissipation surface 13 causes a temperature difference between the upper and lower parts of the gas in the air cavity interlayer 9. The temperature difference drives the gas to circulate in the air cavity interlayer 9 and the gas corrugated flow channel.

[0040] The alloy encapsulation shell 8 has a synchronization plate 801 inside, and the separation pushers 5 are all fixedly installed on the synchronization plate 801. The surface of the alloy encapsulation shell 8 has a shell through hole 802, and a pusher 803 is provided in the shell through hole 802. The pusher 803 is integrally fixed with the synchronization plate 801.

[0041] A weak sealing ring 804 is provided between the extrusion table 803 and the housing through hole 802. When the extrusion table 803 is subjected to a compressive force exceeding a set threshold, the weak sealing ring 804 will break, causing the synchronous plate 801 to drive the separation pusher 5 to extrude and cut the weak layer 4.

[0042] A compressed air chamber 901 is provided in the air chamber interlayer 9. A cross control part 902 is provided on the outside of the compressed air chamber 901. A cut-off flow channel 903 is opened in the cross control part 902. The cut-off flow channel 903 is connected to the inner cavity of the compressed air chamber 901. The compressed air chamber 901 stores compressed gas. When the compressed gas inside the compressed air chamber 901 is released to the outside through the cut-off flow channel 903, the gas expands and does work, and the temperature decreases.

[0043] The housing through hole 802 is also provided with a transverse cavity 904. The transverse cavity 904 divides the cut-off flow channel 903 into two parts. A sealing plug shaft 905 is provided inside the transverse cavity 904. The sealing plug shaft 905 is in sealing contact with the inner wall surface of the transverse cavity 904. The cut-off flow channel 903 is blocked by the sealing plug shaft 905, so that the cut-off flow channel 903 is in a normally closed state.

[0044] A side spring 906 is provided at one end of the sealing plug shaft 905, and a hot melt push rod 907 is provided at the other end of the sealing plug shaft 905. The side spring 906 applies elastic pressure to the sealing plug shaft 905, causing the sealing plug shaft 905 to tend to move in the direction of the hot melt push rod 907. The hot melt push rod 907 limits the sealing plug shaft 905. When the battery temperature exceeds the set threshold, the hot melt push rod 907 melts, causing the sealing plug shaft 905 to move axially. At this time, the cut-off flow channel 903 is opened.

[0045] The cross control unit 902 is provided with an overflow groove 908, which communicates with the cross cavity 904. The molten hot melt ejector rod 907 is discharged through the overflow groove 908. The cross control unit 902 is also provided with a drive cavity 909, in which a piston part 910 is provided. The piston part 910 is in sealed contact with the drive cavity 909. A movable rod 911 is fixedly provided on the piston part 910, and a sealing pressure plate 912 is fixedly provided at the other end of the movable rod 911.

[0046] The air chamber interlayer 9 is fixedly provided with a mating plate 913 inside, and a supporting spring 914 is provided on the outside of the sealing plate 912. The supporting spring 914 applies elastic pressure to the sealing plate 912, so that the sealing plate 912 has a tendency to move away from the mating plate 913. When the cut-off flow channel 903 is opened, the compressed gas in the compressed air chamber 901 drives the piston part 910 to move, so that the sealing plate 912 and the mating plate 913 are squeezed and fitted, dividing the air chamber interlayer 9 into upper and lower parts.

[0047] A gas supply pipe 915 is connected to one side of the drive chamber 909, and the other end of the gas supply pipe 915 is connected to the lower surface of the sealing plate 912. When the sealing plate 912 and the mating plate 913 are pressed together, dividing the gas chamber interlayer 9 into upper and lower parts, the gas in the drive chamber 909 can enter the lower half of the gas chamber interlayer 9 after being divided through the gas supply pipe 915. A normally closed exhaust hole 917 is opened through the surface of the gas chamber interlayer 9. The normally closed exhaust hole 917 is located in the upper half of the gas chamber interlayer 9 after being divided. A normally closed blocking block 916 is fixedly installed on the sealing plate 912. Initially, the normally closed blocking block 916 blocks and closes the normally closed exhaust hole 917. When the sealing plate 912 and the mating plate 913 are pressed together, the normally closed blocking block 916 and the normally closed exhaust hole 917 are misaligned and separated, so that the normally closed exhaust hole 917 is connected to the upper half of the gas chamber interlayer 9 after being divided.

[0048] like Figure 2 and Figure 3As shown, multiple sets of separation pushers 5 are arranged symmetrically vertically. Each set of two complete sets of separation pushers 5 is separated by a set of separation pushers 5 with flow channel holes 10. Through the spacing of the flow channel holes 10, in conjunction with the compression holes 7, a gas flow channel with vertical undulations is formed inside the battery. The two ends of the gas flow channel are connected to the upper and lower ends of the gas cavity interlayer 9 through the upper connecting groove 11 and the bottom connecting gas passage 12, respectively, forming a circulation path. That is, the gas is heated in the gas flow channel inside the battery and cooled in the gas cavity interlayer 9. The gas density decreases when heated and increases when cooled. Through the heat dissipation effect of the gas cavity interlayer 9, the gas flows downward in the gas cavity interlayer 9. Driven by the temperature difference, the gas circulates in the gas cavity interlayer 9 and the compression holes 7. Compared with the pure heat conduction method in traditional solid-state batteries, the efficiency is higher, the overall temperature uniformity of the battery is higher, and the generation of local hot spots is reduced.

[0049] The battery temperature is monitored by a temperature sensor. When the abnormal temperature rises to a set value, an external driving device compresses the pushing table 803, causing the weak sealing ring 804 to rupture. The synchronous plate 801 then drives the separation pusher 5 to move towards the weak layer 4. Figure 4 As shown, by squeezing the separating pusher 5, the weak layer 4 is split. At this time, the solid electrolyte 3 is squeezed and cut into two parts, and a gap is generated in the solid electrolyte 3. The connection between the positive and negative electrodes through the solid electrolyte is disconnected, the ion conduction path is cut off, the ions cannot migrate, the electrochemical reaction between the positive and negative electrodes is terminated and no new reaction heat is generated, reducing the risk of thermal runaway.

[0050] In the above process, since the separating pusher 5 has a certain thickness and the solid electrolytes 3 on both sides of the weak layer 4 are hard solid materials, when the separating pusher 5 with a certain thickness is inserted into the upper and lower sides of the solid electrolytes 3, the two parts of the solid electrolytes 3 can be separated through the weak layer 4. In this process, the separating pusher 5 does not need to be too long, it only needs to be able to be inserted between the upper and lower sides of the solid electrolytes 3 on both sides of the weak layer 4. Separation is achieved by the hardness of the solid electrolytes 3 themselves. The separation distance is extremely small at the macroscopic angle, so that a gap is created in the solid electrolytes 3 at the microscopic angle. A sandwich cookie can be used as an example to understand this. To separate the two sides of two sandwich cookies, only a small part needs to be inserted by fingernail.

[0051] The aforementioned external driving device can be a cylinder, an electric telescopic control device, etc., as long as it can generate compressive force, which will not be elaborated in this application.

[0052] like Figure 7As shown, when the battery further thermally runs away and the temperature rises to the point where the hot melt push rod 907 melts, under the elastic force of the side spring 906, the sealing plug shaft 905 moves to the right, causing the compressed gas in the compressed gas chamber 901 to enter the drive chamber 909 through the cut-off flow channel 903, driving the piston part 910 to move downward, which in turn drives the sealing pressure plate 912 to move downward, as shown. Figure 6 As shown, when the sealing plate 912 comes into contact with the mating plate 913, the air chamber interlayer 9 is divided into upper and lower parts by the cooperation of the sealing plate 912 and the mating plate 913.

[0053] After the closed pressure plate 912 contacts the mating platform 913, the piston part 910 is displaced through the communication port between the air supply pipe 915 and the drive chamber 909, so that the gas in the drive chamber 909 is input to the bottom of the closed pressure plate 912 through the air supply pipe 915, and enters the compression through hole 7 of the battery through the bottom connecting air passage 12 to achieve forced cooling.

[0054] The gas returns through the upper connecting groove 11, enters the upper part of the gas chamber interlayer 9, and is discharged to the outside through the normally closed exhaust port 917, maintaining pressure balance. The compressed gas expands suddenly to do work, and its internal energy decreases, reaching sub-zero temperature. The low-temperature gas enters the compression through hole 7 of the battery and circulates, which can forcibly cool the battery and further reduce the risk of thermal runaway.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-safety solid-state lithium-ion battery that prevents thermal runaway, comprising a positive electrode material, a negative electrode material, and a solid electrolyte disposed between the positive electrode material and the negative electrode material, characterized in that: The solid electrolyte has a weak layer, and separation pushers are symmetrically arranged on the upper and lower sides of the weak layer. By squeezing and cutting the weak layer with the separation pushers, the solid electrolyte can be split into two parts, and an insulating gap is generated between the two parts. The positive electrode material and the negative electrode material are respectively provided with current collectors on the side away from the solid electrolyte. A compression through hole is opened through the current collector, so that the current collector can be compressed to adapt to the displacement when the solid electrolyte splits and gaps are generated.

2. The high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 1, characterized in that: The positive electrode material, negative electrode material, solid electrolyte, and separator pusher are externally packaged with an alloy encapsulation shell. A gas cavity interlayer is formed on one side of the alloy encapsulation shell. A portion of the separator pusher has through-holes for flow channels. Through the separator pusher, flow channels, and compression through-holes, a gas undulating flow channel is formed that can pass through all the compression through-holes in sequence.

3. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 2, characterized in that: The upper part of the air cavity interlayer is connected to an upper connecting groove, and the lower part of the air cavity interlayer is connected to a bottom connecting air passage. The air cavity interlayer is connected to one end of the gas vortex flow channel through the upper connecting groove, and the air cavity interlayer is connected to the other end of the gas vortex flow channel through the bottom connecting air passage.

4. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 3, characterized in that: The surface of the alloy encapsulation shell is provided with a corrugated heat dissipation surface, which is positioned corresponding to the air cavity interlayer. The corrugated heat dissipation surface dissipates heat from the air cavity interlayer, and the heat dissipation from the corrugated heat dissipation surface creates a temperature difference between the upper and lower parts of the gas in the air cavity interlayer. The temperature difference drives the gas to circulate in the air cavity interlayer and the gas folding flow channel.

5. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 3, characterized in that: The alloy encapsulation shell is equipped with a synchronization plate inside, and the separation pushers are all fixedly mounted on the synchronization plate. The surface of the alloy encapsulation shell has a through hole, and a pushing platform is provided in the through hole. The pushing platform is integrally fixed with the synchronization plate.

6. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 5, characterized in that: A weak sealing ring is provided between the extrusion platform and the through hole of the housing. When the extrusion platform is subjected to a pressure exceeding a set threshold, the weak sealing ring will break, causing the synchronous plate to drive the separation pusher to extrude and cut the weak layer.

7. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 5, characterized in that: A compressed air chamber is provided in the air chamber interlayer. A cross control part is provided on the outside of the compressed air chamber. A cut-off flow channel is opened in the cross control part and is connected to the inner cavity of the compressed air chamber. The compressed air chamber stores compressed gas inside. When the compressed gas inside the compressed air chamber is released to the outside through the cut-off flow channel, the gas expands and does work, and the temperature decreases.

8. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 7, characterized in that: The shell through hole is also provided with a transverse cavity, which cuts the flow channel into two parts. A sealing plug shaft is provided inside the transverse cavity. The sealing plug shaft is in sealing contact with the inner wall surface of the transverse cavity. The flow channel is blocked by the sealing plug shaft, so that the flow channel is in a normally closed state.

9. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 8, characterized in that: One end of the sealing plug shaft is provided with a side spring, and the other end of the sealing plug shaft is provided with a hot melt push rod. The side spring applies elastic pressure to the sealing plug shaft, causing the sealing plug shaft to tend to move in the direction of the hot melt push rod. The hot melt push rod limits the sealing plug shaft. When the battery temperature exceeds a set threshold, the hot melt push rod melts, causing the sealing plug shaft to move axially, at which point the flow channel is cut off and opened.

10. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 9, characterized in that: The cross control section is provided with an overflow groove, which is connected to the cross cavity, through which the molten hot melt push rod is discharged.

11. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 9, characterized in that: The cross control unit also has a drive chamber, in which a piston is provided. The piston is in sealed contact with the drive chamber. A movable rod is fixedly provided on the piston, and a sealing pressure plate is fixedly provided at the other end of the movable rod.

12. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 11, characterized in that: The air chamber interlayer is fixedly provided with a mating plate, and the sealing plate is provided with a supporting spring. The supporting spring applies elastic pressure to the sealing plate, so that the sealing plate has a tendency to move away from the mating plate. When the cut-off flow channel is opened, the compressed gas in the compressed air chamber drives the piston to move, so that the sealing plate and the mating plate are squeezed together, dividing the air chamber interlayer into upper and lower parts.

13. A high-safety solid-state lithium-ion battery for preventing thermal runaway according to claim 12, characterized in that: One side of the drive chamber is connected to an air supply pipe, and the other end of the air supply pipe is connected to the lower surface of the sealing plate. When the sealing plate and the mating plate are pressed together to separate the air chamber interlayer into upper and lower parts, the gas in the drive chamber can enter the lower half of the air chamber interlayer after separation through the air supply pipe. The surface of the air chamber interlayer has a normally closed exhaust port extending outwards. The normally closed exhaust port is located in the upper half of the air chamber interlayer after separation. A normally closed blocking block is fixedly installed on the sealing pressure plate. Initially, the normally closed blocking block seals and closes the normally closed exhaust port. When the sealing pressure plate and the mating plate are pressed together, the normally closed blocking block and the normally closed exhaust port are misaligned and separated, so that the normally closed exhaust port is connected to the upper half of the air chamber interlayer after separation.

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