CN209981412U

CN209981412U - Thermal runaway processing system for lithium ion battery pack

Info

Publication number: CN209981412U
Application number: CN201822001562.4U
Authority: CN
Inventors: 李伟峰; 王贺武; 欧阳明高; 张亚军; 李成; 李建秋; 卢兰光; 韩雪冰; 杜玖玉; 冯旭宁
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-01-21
Anticipated expiration: 2028-11-30

Abstract

The application provides a lithium ion battery pack thermal runaway processing system which comprises a lithium ion battery pack, an air pressure detection device, a gas storage device, a diluting device and a controller. On one hand, the air pressure detection device is arranged in the shell of the lithium ion battery pack, so that the internal air pressure condition of the lithium ion battery pack can be monitored in real time, and a monitoring person can quickly act according to the internal air pressure condition of the lithium ion battery pack after a thermal runaway process occurs; on the other hand, the lithium ion battery pack is electrically connected with the gas storage device and the diluting device, so that when the battery cell in the lithium ion battery pack is out of thermal runaway, the battery cell can be moved out of the shell through the window door, the gas pressure in the shell is adjusted by controlling the gas storage device or the diluting device, and further severe chemical reaction in the lithium ion battery pack is effectively prevented.

Description

Thermal runaway processing system for lithium ion battery pack

Technical Field

The application relates to the technical field of lithium ion batteries, in particular to a thermal runaway processing system of a lithium ion battery pack.

Background

In recent years, the market share of electric vehicles has steadily increased. Lithium ion batteries have excellent properties such as high voltage, high specific energy, long cycle life, and no environmental pollution, and are highly concerned by the electric automobile industry. However, during the thermal runaway of the lithium ion battery, combustible mixed gas such as H2, CO or CH4 and the like is generated and accumulated inside the battery. After the lithium ion battery reaches a certain pressure limit, the safety valve is flushed by the combustible mixed gas and released to the external environment along with the burst of the battery. In the process of battery eruption, the surface temperature of the lithium ion battery can reach about 1000 ℃ at most, the internal temperature of the lithium ion battery cell is higher, and the surface temperature of the lithium ion battery cell is about 600-1200 ℃ along with sparks. Since the high temperature surface and spark temperature of the lithium ion battery are much higher than the ignition temperature of the gaseous propellant, once the gaseous propellant is sprayed in the air and contacts with oxygen, the ignition phenomenon is very easy to occur and a fire disaster is caused. In addition, even if the gaseous eruption generated after the lithium ion battery erupts does not catch fire, if a certain amount of the gaseous eruption is accumulated gradually, the explosion phenomenon may occur, and the harmfulness is greater. Therefore, the burst of the lithium ion battery is one of the potential safety hazards of causing the lithium ion battery to be in a fire or even an explosion accident. Fire and explosion accidents caused by thermal runaway of the lithium ion battery are frequently reported, and the safety problem of the use of the lithium ion battery becomes one of the main factors for preventing the large-scale commercial application of the lithium ion battery in the power supply industry.

The thermal runaway process of the lithium ion battery is formed by a series of chemical reactions. In the traditional scheme, due to the structural limitation of the lithium ion battery, the stability of the lithium ion battery material is only changed in the lithium ion battery design stage, or the external boundary of the lithium ion battery is adjusted after the lithium ion battery is produced, such as thermal management, the chemical reaction boundary inside the lithium ion battery monomer cannot be directly controlled, and the problems of the occurrence and development process of the thermal runaway process cannot be effectively controlled.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a thermal runaway processing system for a lithium ion battery pack to solve the problem that the conventional lithium ion battery cannot control the chemical reaction boundary inside the battery cell.

A lithium ion battery thermal runaway processing system, comprising:

the lithium ion battery pack comprises a shell and a plurality of battery cells arranged in the shell;

the air pressure detection device is arranged in the shell and used for detecting the air pressure in the shell;

the gas storage device is connected with the lithium ion battery pack through a gas pipeline;

the diluting device is connected with the lithium ion battery pack through a gas pipeline;

and the controller is respectively electrically connected with the air pressure detection device, the air storage device and the diluting device and is used for controlling the air storage device or the diluting device to adjust the air pressure in the shell according to the air pressure in the shell.

The application provides a thermal runaway processing system of a lithium ion battery pack. The thermal runaway processing system of the lithium ion battery pack comprises the lithium ion battery pack, an air pressure detection device, an air storage device, a dilution device and a controller. The lithium ion battery pack comprises a shell and a plurality of battery cells arranged in the shell. The air pressure detection device is arranged in the shell and used for detecting the air pressure in the shell. The lithium ion battery pack is respectively connected with the gas storage device and the diluting device through gas pipelines. The controller is respectively electrically connected with the air pressure detection device, the air storage device and the dilution device. According to the thermal runaway processing system of the lithium ion battery pack, on one hand, the air pressure detection device is arranged in the shell of the lithium ion battery pack, so that the internal air pressure condition of the lithium ion battery pack can be monitored in real time, and monitoring personnel can quickly act according to the internal air pressure condition of the lithium ion battery pack after a thermal runaway process occurs; on the other hand, the lithium ion battery pack is electrically connected with the gas storage device and the diluting device, so that when the battery cell in the lithium ion battery pack is out of thermal runaway, the battery cell can be moved out of the shell through the window door, the gas pressure in the shell is adjusted by controlling the gas storage device or the diluting device, and further severe chemical reaction in the lithium ion battery pack is effectively prevented.

Drawings

Fig. 1 is a perspective view of a lithium ion battery pack according to an embodiment of the present disclosure;

fig. 2 is a top view of a lithium ion battery pack provided in an embodiment of the present application;

fig. 3 is a schematic diagram illustrating an assembly of a cell and a top cover plate in a lithium ion battery pack according to an embodiment of the present disclosure;

fig. 4 is a top view of a lithium ion battery pack provided in an embodiment of the present application;

fig. 5 is a top view of a lithium ion battery pack provided in an embodiment of the present application;

fig. 6 is a perspective view of a lithium ion battery pack according to an embodiment of the present application;

fig. 7 is a top view of a thermal runaway processing system for a lithium ion battery pack provided by an embodiment of the present application;

fig. 8 is a top view of a system for handling thermal runaway in a lithium ion battery pack according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a lithium ion battery pack heat dissipation system according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a lithium ion battery pack heat dissipation system according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a lithium ion battery pack heat dissipation system according to an embodiment of the present disclosure;

fig. 12 is a schematic diagram illustrating an assembly of a battery cell and a heat dissipation core in a heat dissipation system of a lithium ion battery pack according to an embodiment of the present disclosure;

fig. 13 is a top view of a lithium ion battery pack heat dissipation system according to an embodiment of the present disclosure;

fig. 14 is a top view of a system for thermal runaway processing for lithium ion battery packs according to an embodiment of the present disclosure;

fig. 15 is a top view of a system for handling thermal runaway in a lithium ion battery pack according to an embodiment of the present disclosure.

Reference numerals:

10 a shell; 100 lithium ion battery packs; 110 a top cover plate; 111 grooves; 120 bottom pad plate;

130 wall plates; 131 window doors; 132 through holes; 133 a rotating shaft; 134 observation window; 135 first valve

136 a second valve; 137 a third valve; 138 opening holes; 140 a storage space; 141 sub-receiving space

150 of a bracket; 151 buckling; 160 electric cores; 161 positive pole piece; 162 negative pole piece;

163 positive electrode tab; 164 a negative electrode tab; 170 positioning clips; 171 positioning the shaft; 180 positioning hole

190 an electrolyte; 191 a transmission pipeline; 192 a recovery conduit; 200 air pressure detection device

300 gas storage means; 400 a dilution unit; 500 a controller; 600 heat dissipation means; 610 heat radiation coil pipe

611 heat dissipation coil cavity; 612 a first orifice; 613 a second orifice; 620 water cooling heat radiation unit

621 a water tank; 622 water pump; 623 water outlet; 624 water inlet; 625 first pump port

626 second pump port; 630 a heat dissipation core; 631 a heat-dissipating core cavity; 632 connecting fastener

640 an air-cooling heat dissipation unit; 641 a radiator; 642 Heat sink conduit

700 electrolyte suction means; 710 an electrolyte storage tank; 720 capacity detection assembly

730 the suction device valve; 740 a first pressure pump; 800 temperature detection device

900 electrolyte recovery unit; 910 electrolyte recovery tank; 920 recovery unit valve;

930 second pressure pump

Detailed Description

For the purpose of making the technical solutions and advantages of the present application more clearly understood, the following detailed description of the lithium ion battery pack provided in the present application is made with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The present application provides a lithium ion battery pack 100. It should be noted that the application scenario of the lithium ion battery pack 100 is not limited by the lithium ion battery pack 100 provided in the present application. Any application scenario may employ the lithium ion battery pack 100 provided herein. Optionally, the lithium ion battery pack 100 provided by the present application is applied to the field of electric vehicles. Specifically, the lithium ion battery pack 100 is applied to research on prevention of disasters such as fire or explosion caused by thermal runaway of the lithium ion battery.

Referring to fig. 1 and 2, in an embodiment of the present application, the lithium ion battery pack 100 includes a housing 10, a bracket 150, and a plurality of battery cells 160. Specifically, the lithium ion battery pack 100 further includes an electrolyte filled in the case 10. The battery cells 160 may be connected in series or in parallel.

The housing 10 includes a top cover plate 110, a bottom backing plate 120, and a plurality of wall plates 130 connected end to end in sequence. The top cover plate 110, the bottom shim plate 120 and the plurality of wall plates 130 together form a receiving space 140. The bracket 150 is disposed in the receiving space 140, and is used for dividing the receiving space 140 into a plurality of sub-receiving spaces 141. Each of the battery cells 160 is disposed in one of the sub-receiving spaces 141. Each of the wall plates 130 is opened with a window door 131 so that the battery cell 160 can freely enter and exit the housing 10 through the window door 131.

Specifically, the material of the case 10 may be one of an aluminum alloy and an iron-carbon alloy. The top surface of the bracket 150 is fixedly connected to the top cover plate 110, and the bottom surface of the bracket 150 is fixedly connected to the bottom base plate 120, so as to divide the storage space 140 into the plurality of sub-storage spaces 141. The support 150 can reduce the reaction area of the electrolyte when the lithium ion battery pack 100 is thermally out of control, avoid chain reaction, and avoid sudden rise of the internal temperature and the surface temperature of the lithium ion battery pack 100 due to simultaneous release of energy. The top cover plate 110 may serve as the positive terminal of the lithium ion battery pack 100 and the bottom gasket plate 120 may serve as the negative terminal of the lithium ion battery pack 100.

In this embodiment, on one hand, the lithium ion battery pack 100 structure provided in the present application divides the storage space 140 in the casing 10 into a plurality of sub storage spaces 141 that are separately sealed in different parts by the support 150 disposed in the casing 10 of the lithium ion battery pack 100, so as to greatly reduce the volume of the electrolyte reaction inside the lithium ion battery pack 100 when thermal runaway occurs, and greatly reduce the electrolyte reaction rate, thereby stopping further development of thermal runaway; on the other hand, the wall plate 130 of the casing 10 is provided with the window door 131, so that when thermal runaway occurs in the battery cell 160 in the lithium ion battery pack 100, the battery cell 160 can be moved out of the casing 10 through the window door 131, and further severe chemical reactions in the lithium ion battery pack 100 can be effectively prevented.

As shown in fig. 3, in an embodiment of the present application, the battery cell 160 includes a positive electrode tab 161, a negative electrode tab 162, a positive electrode tab 163, and a negative electrode tab 164. The positive electrode sheet 161 and the negative electrode sheet 162 are wound to be cylindrical. The positive electrode tab 163 is disposed on one side of the battery cell 160 close to the top cover plate 110, and is electrically connected to the positive electrode tab 161. The negative electrode tab 164 is disposed on one side of the battery cell 160 close to the top cover plate 110, and is electrically connected to the negative electrode tab 162.

Specifically, the battery cell 160 further includes a separator disposed between the positive electrode tab 161 and the negative electrode tab 162. The surface of the positive electrode sheet 161 is coated with a positive electrode material. The surface of the negative pole piece 162 is coated with a negative pole electrode material. Optionally, the material of the positive electrode plate 161 may be aluminum. The material of the negative electrode plate 162 may be copper. The battery cell 160 is a winding battery cell 160. The battery core 160 is formed by winding the positive electrode sheet 161, the separator and the negative electrode sheet 162. The positive electrode tab 163 is electrically connected with the positive electrode plate 161, and the negative electrode tab 164 is electrically connected with the negative electrode plate 162.

In this embodiment, the positive electrode tab 163 and the negative electrode tab 164 are disposed at the same side of the battery cell 160, so that the battery cell 160 is connected to the top cover plate through the positive electrode tab 163 and the negative electrode tab 164, thereby avoiding short circuit fire caused by disorder of wiring inside the casing 10.

Referring to fig. 3, in an embodiment of the present application, a plurality of grooves 111 are disposed on a bottom surface of the top cover plate 110. Each of the positive electrode tabs 163 is connected in contact with one of the grooves 111. Each of the negative electrode tabs 164 is connected in contact with one of the grooves 111.

Specifically, the bottom surface of the top cover plate 110 is provided with a plurality of grooves 111, and the top surface of the bracket 150 is fixedly connected to the top cover plate 110 such that each of the sub receiving spaces 141 has at least two of the grooves 111.

In addition, the size of the groove 111 is consistent with the size of the positive electrode tab 163 and the negative electrode tab 164, so that when the battery cell 160 is installed inside the casing 10, the positive electrode tab 163 and the negative electrode tab 164 are respectively in tight contact with the two grooves 111 of the top cover plate 110, and the connection between the battery cell 160 and the top cover plate 110 is realized. The positive electrode tab 163 or the negative electrode tab 164 is connected to the groove 111 in a contact manner, and is not fixedly connected.

In this embodiment, by providing the groove 111, when a thermal runaway phenomenon occurs in a certain sub-receiving space 141 in the casing 10 of the lithium ion battery pack 100, the window door 131 on the wall plate 130 can be conveniently and quickly opened, and the battery cell 160 in the sub-receiving space 141 can be taken out.

In one embodiment of the present application, the top cover plate 110 is made of a conductive material. The bottom surface of the top cover plate 110 is coated with an insulating varnish except for the groove 111.

Specifically, the insulating varnish is coated on the bottom surface of the top cover plate 110 except for the groove 111, so that the sub-receiving spaces 141 can be kept to have good insulation and tightness, and the electrolyte can be prevented from leaking among the sub-receiving spaces 141, thereby preventing thermal runaway chain reaction. In addition, the top cover plate 110 may serve as a positive terminal of the lithium ion battery pack 100. Wires can be arranged in the top cover plate 110, and the top cover plate 110 is electrically connected with the plurality of battery cells 160 through the wires and the plurality of grooves 111, so as to normally realize a lithium insertion and removal cycle of the lithium ion battery. The plurality of battery cells 160 may also be connected in series or in parallel by the wires.

In an embodiment of the present application, the top surface of the bracket 150 is fixedly connected to the bottom surface of the top cover plate 110, and the bottom surface of the bracket 150 is fixedly connected to the top surface of the bottom base plate 120, so as to form a plurality of independent and closed sub-receiving spaces 141. The surface of the bracket 150 and the top surface of the bottom pad 120 are coated with an insulating varnish.

Specifically, the bracket 150 may be a material that is heat-resistant and does not deform in a high-temperature environment. Optionally, the top surface of the bracket 150 is welded to the bottom surface of the top cover plate 110, and the bottom surface of the bracket 150 is welded to the top surface of the bottom backing plate 120.

As shown in fig. 4, in an embodiment of the present application, the bracket 150 is provided with a plurality of buckles 151, so that each of the battery cells 160 is buckled with the bracket 150.

Specifically, the holder 150 is provided with a plurality of catches 151 such that each of the sub receiving spaces 141 has one of the catches 151. Each of the latches 151 is engaged with one of the battery cells 160. The catch 151 has a secured state and a relaxed state. When the buckle 151 is in the clamped state, the battery cell 160 may be fixed to the bracket 150 by the buckle 151. When the buckle 151 is in the relaxed state, the battery cell 160 fixed to the bracket 150 may be separated from the bracket 150 by the buckle 151.

In this embodiment, the buckle 151 is arranged, so that the battery cell 160 can be fixed in the casing 10 to perform normal lithium removal and insertion operations when the thermal runaway phenomenon does not occur in the lithium ion battery pack 100. When the thermal runaway phenomenon occurs in the lithium ion battery pack 100, the snap 151 enables the battery cell 160 to be detached from the bracket 150 and separated from the casing 10 of the lithium ion battery pack 100 through the window door 131 on the wall plate 130.

As shown in fig. 5, in an embodiment of the present application, a positioning clip 170 is disposed in each of the sub-receiving spaces 141. The positioning clip 170 is used to clamp the battery cell 160, so that the battery cell 160 is fixedly connected to the casing 10.

Specifically, the positioning clip 170 functions identically to the snap 151 of the above-described embodiment.

In an embodiment of the present application, the positioning clip 170 includes a positioning shaft 171, the positioning shaft 171 is fixedly connected to the bottom pad 120, and the positioning clip 170 is made of a heat-resistant and insulating material.

Specifically, a spring and a positioning shaft 171 are provided in the positioning clip 170. The positioning shaft 171 is fixedly connected to the bottom plate 120, and the spring passes through the bottom plate 120. The spring is matched with the positioning shaft 171, so that the positioning clip 170 can clamp the battery core 160 and be fixed in the sub-receiving space 141.

As shown in fig. 6, in an embodiment of the present application, the wall plate 130 is provided with a through hole 132. The size of the through hole 132 is larger than that of the battery cell 160, so that the battery cell 160 can freely enter and exit the housing 10 through the through hole 132. The lithium ion battery pack 100 further includes a rotation shaft 133. The rotating shaft 133 is disposed between the window door 131 and the wall plate 130, so that the window door 131 covers the through hole 132.

Specifically, the window door 131 is made of an insulating material or the surface of the window door 131 is coated with an insulating varnish. When the lithium ion battery pack 100 normally performs charge and discharge work and does not generate a thermal runaway phenomenon, the window door 131 covers the through hole 132, so that the inside of the lithium ion battery pack 100 is in a closed state, and the electrolyte inside the lithium ion battery pack 100 is prevented from overflowing to cause an electric leakage phenomenon. When the thermal runaway phenomenon occurs in the lithium ion battery pack 100, the battery cell 160 in the sub-receiving space 141 in which the thermal runaway phenomenon occurs can be taken out through the through hole 132 by opening the window door 131, so that further severe chemical reaction inside the lithium ion battery pack 100 is effectively prevented.

In addition, each sub-receiving space 141 has the through hole 132 and the window door 131 corresponding thereto, so that when a maintenance worker of the lithium ion battery pack 100 finds that the thermal runaway phenomenon occurs in the electrolyte of a certain battery cell 160 or a certain region in the lithium ion battery pack 100, the maintenance worker does not need to take out or damage all the battery cells 160. After the battery cell 160 in the sub-receiving space 141 in which the thermal runaway phenomenon occurs is taken out, the battery cell 160 and the electrolyte in the remaining sub-receiving space 141 can still work normally.

Referring to fig. 6, in an embodiment of the present application, the li-ion battery pack 100 further includes an observation window 134. The observation window 134 is embedded in the window door 131 for observing the internal state of the lithium ion battery pack 100. The observation window 134 is made of pyrex.

Specifically, the maintainer of the lithium ion battery pack 100 can observe the internal state of the lithium ion battery pack 100 at any time through the observation window 134, so that the maintainer can find and take corresponding measures in time when the thermal runaway phenomenon is sent inside the lithium ion battery pack.

The present application provides a lithium ion battery pack 100 comprising a housing 10, a support 150, and a plurality of cells 160. The housing 10 includes a top cover plate 110, a bottom backing plate 120, and a plurality of wall plates 130 connected end to end in sequence. A window door 131 is opened on each of the wall plates, so that the battery cell 160 can freely enter and exit the housing 10 through the window door 131. The holder 150 is provided with a snap 151 or a retaining clip 170. According to the structure of the lithium ion battery pack 100 provided by the application, on one hand, the support 150 is arranged in the shell 10 of the lithium ion battery pack 100, and the containing space 140 in the shell 10 is divided into the plurality of sub containing spaces 141 which are independently sealed in different parts, so that the reaction volume of electrolyte in the lithium ion battery pack 100 is greatly reduced when thermal runaway occurs, and the reaction rate of the electrolyte is greatly reduced, thereby stopping the further development of the thermal runaway; on the other hand, the wall plate 130 of the casing is provided with the window door 131, when thermal runaway occurs in the battery cell 160 in the lithium ion battery pack 100, the battery cell 160 can be moved out of the casing 10 through the window door 131, and further severe chemical reaction inside the lithium ion battery pack 100 is effectively prevented.

The application also provides a thermal runaway processing system and method of the lithium ion battery pack.

As shown in fig. 7, in an embodiment of the present application, the lithium ion battery pack thermal runaway processing system provided by the present application includes the lithium ion battery pack 100 mentioned above. The thermal runaway processing system of the lithium ion battery pack further comprises an air pressure detection device 200, an air storage device 300, a dilution device 400 and a controller 500. The gas storage device 300 and the dilution device 400 are respectively connected with the lithium ion battery pack 100 through gas pipelines. The controller 500 is electrically connected to the air pressure detecting device 200, the air storage device 300, and the diluting device 400, respectively. The air pressure detecting device 200 is disposed in the lithium ion battery pack 100.

Specifically, the controller 500 may be disposed in a monitoring module connected to the lithium ion battery pack thermal runaway processing system. The controller 500 can control the gas storage device 300 or the diluting device 400 to access the lithium ion battery pack 100 through the monitoring module.

It should be noted that the application environment of the lithium ion battery thermal runaway processing system is not limited. Optionally, the thermal runaway processing system of the lithium ion battery pack can be applied to scientific research. Optionally, the lithium ion battery pack thermal runaway processing system can be applied to electric vehicles. Specifically, the lithium ion battery pack thermal runaway processing system can be assembled on an electric automobile to deal with the thermal runaway phenomenon which can be generated by the battery of the electric automobile. Optionally, the lithium ion battery pack thermal runaway processing system may be applied to a transfer station or a charging station of an electric vehicle, and when the electric vehicle passes through the transfer station or the charging station, the thermal runaway state of the electric vehicle battery is monitored.

In this embodiment, the lithium ion battery pack 100 includes a casing 10 and a plurality of battery cells 160 disposed in the casing 10. The air pressure detecting device 200 is disposed in the housing 10, and is used for detecting the air pressure in the housing 10. The controller 500 is configured to control the gas storage device 300 or the dilution device 400 to adjust the gas pressure in the housing 10 according to the gas pressure in the housing 10. The controller 500 may be a processor.

In this embodiment, the application provides a lithium ion battery pack thermal runaway processing system, on the one hand set up in lithium ion battery pack 100's the casing 10 atmospheric pressure detection device 200 can real time monitoring lithium ion battery pack 100's the inside atmospheric pressure condition for after the thermal runaway process takes place, the control personnel can be according to lithium ion battery pack 100's the inside atmospheric pressure condition, make the action rapidly. On the other hand, the lithium ion battery pack 100 is electrically connected to the gas storage device 300 and the dilution device 400, so that when the battery cell 160 in the lithium ion battery pack 100 is out of thermal runaway, the battery cell 160 is moved out of the housing 10 through the window door 131, and the gas pressure in the housing 10 is controlled to be adjusted by the gas storage device 300 or the dilution device 400, thereby effectively preventing further severe chemical reaction from occurring in the lithium ion battery pack 100.

In one embodiment of the present application, the housing 10 includes a top cover plate 110, a bottom base plate 120, and a plurality of wall plates 130 connected end to end in sequence. The top cover plate 110, the bottom shim plate 120 and the plurality of wall plates 130 together form a receiving space 140. The housing 10 further includes a bracket 150. The housing 10 further includes a bracket 150, and the bracket 150 is disposed in the receiving space 140 and is used for dividing the receiving space 140 into a plurality of sub-receiving spaces 141.

The foregoing description of the present embodiment is provided, and is not repeated herein.

In an embodiment of the present application, each of the battery cells 160 is disposed in one of the sub-receiving spaces 141. Each of the battery cells 160 is electrically connected to the top cover plate 110.

As shown in fig. 8, in an embodiment of the present application, one air pressure detecting device 200 is disposed in each of the sub-receiving spaces 141. The air pressure detecting device 200 is used for detecting the air pressure of each sub receiving space 141.

Specifically, the air pressure detecting device 200 may be an air pressure sensor. The air pressure detecting device 200 may be fixed to an inner wall of the housing 10. Taking the embodiment in fig. 8 as an example, the holder 150 in the housing 10 divides the receiving space 140 in the housing 10 into four sub receiving spaces 141. Accordingly, four air pressure detecting devices 200 are disposed in the housing 10. Each of the sub receiving spaces 141 is provided with one of the air pressure detecting devices 200 for respectively detecting air pressures in the sub receiving spaces 141. The plurality of air pressure detecting devices 200 are also electrically connected to the controller 500, respectively, so as to transmit the detected air pressure in the housing 10 to the controller 500.

In this embodiment, the pressure detection device 200 is disposed in the sub receiving space 141 in the housing 10, so as to realize real-time monitoring of the pressure state of the sub receiving space 141 in the housing 10, and once a thermal runaway phenomenon occurs inside the lithium ion battery pack 100, the pressure detection device 200 can detect a pressure change in the housing 10 at the first time, so that a maintainer of the lithium ion battery pack 100 can find and take corresponding measures in time.

With continued reference to fig. 8, in an embodiment of the present application, the wall plate 130 defines a plurality of first valves 135, a plurality of second valves 136, and a plurality of third valves 137. Each of the sub-receiving spaces 141 has a first valve 135, a second valve 136, and a third valve 137 corresponding thereto. The plurality of first valves 135 are connected to the gas storage device 300 through gas pipes. The plurality of third valves 137 are connected to the dilution unit 400 through a gas pipe.

In this embodiment, by disposing the plurality of first valves 135, the plurality of second valves 136, and the plurality of third valves 137 on the wall plate 130 of the casing 10 of the lithium ion battery pack 100, when a thermal runaway phenomenon occurs, the gas storage device 300 or the dilution device 400 can be connected to the lithium ion battery pack 100 by opening the corresponding valves, so as to timely and effectively adjust the gas pressure in the casing 10, and prevent the further development of the thermal runaway phenomenon from the inside of the lithium ion battery pack 100.

In an embodiment of the present application, a method for processing thermal runaway of a lithium ion battery pack includes steps S100 to S160:

s100, receiving the gas pressure of the sub-receiving space 141 obtained by the gas pressure detecting device 200.

Specifically, the air pressure detecting device 200 acquires the air pressure in the sub receiving space 141, and transmits the air pressure of the sub receiving space 141 to the controller 500.

S110, determining whether the gas pressure in the sub receiving space 141 is greater than the first preset pressure.

After the controller 500 receives the gas pressure of the sub receiving space 141, the controller 500 retrieves the first preset pressure pre-stored in the monitoring module. The first preset pressure is preset by the lithium ion battery pack monitoring personnel. Further, the controller 500 compares the gas pressure of the sub receiving space 141 with the first preset pressure, and determines whether the gas pressure of the sub receiving space 141 is greater than the first preset pressure.

S120, if the gas pressure of the sub receiving space 141 is greater than the first preset pressure, continuously determining whether the gas pressure of the sub receiving space 141 is greater than the second preset pressure. The second preset pressure is greater than the first preset pressure.

Specifically, the second preset pressure is greater than the first preset pressure. The first preset pressure is a low risk pressure. The second predetermined pressure is a high hazard pressure. If the gas pressure in the sub-receiving space 141 is greater than the first preset pressure, it indicates that the electrolyte 190 or the battery cell 160 in the lithium ion battery pack 100 has started to react and a thermal runaway phenomenon has occurred, but the risk coefficient is low. In order to detect whether the lithium ion battery pack 100 is in a thermal runaway state with a high risk coefficient, it is further determined whether the gas pressure of the sub receiving space 141 is greater than the second preset pressure.

S130, if the gas pressure of the sub receiving space 141 is not greater than the second preset pressure, controlling the gas mixture in the sub receiving space 141 to enter the gas storage device 300.

Specifically, if the gas pressure in the sub-receiving space 141 is not greater than the second preset pressure, it indicates that the electrolyte 190 or the battery cell 160 in the lithium ion battery pack 100 has not reacted violently, and a severe thermal runaway phenomenon has not occurred. The lithium ion battery pack 100 is temporarily free from the danger of fire or explosion. Subsequently, the controller 500 makes a solution to the low-risk coefficient thermal runaway phenomenon, i.e., controls the gas mixture in the sub-receiving space 141 to enter the gas storage device 300. In addition, the controller 500 may perform the steps S100 to S130 on the sub receiving spaces 141, respectively, so as to open the gas storage device 300 to the sub receiving space 141 where the gas pressure abnormality occurs. The gas storage device 300 may suck a flammable gas mixture generated by the thermal runaway reaction in the sub receiving space 141, thereby slowing down the thermal runaway reaction rate in the sub receiving space 141.

And S150, returning to the step S100.

Specifically, the controller 500 returns to step S100 to continue monitoring the pressure variation in the sub receiving space 141.

In this embodiment, the lithium ion battery processing method obtains the gas pressure in the sub receiving space 141 of the lithium ion battery pack 100 through the gas pressure detecting device 200, and further, controls the gas storage device 300 to receive the gas mixture in the sub receiving space 141 according to the comparison result between the gas pressure in the sub receiving space 141 and the first preset pressure, and the comparison result between the gas pressure in the sub receiving space 141 and the second preset pressure, so as to effectively reduce the density of the gas mixture in the sub receiving space 141 after the thermal runaway reaction occurs, and avoid explosion and fire in the lithium ion battery pack 100.

In an embodiment of the present application, the step S130 includes:

s131, controlling the first valve 135 to open, and controlling the second valve 136 and the third valve 137 to close.

Specifically, the first valve 135 is connected to the gas storage device 300 through a gas pipe, so that the controller 500 controls the first valve 135 to open, controls the second valve 136 and the third valve 137 to close, and connects the gas storage device 300 to the sub-receiving space 141.

In an embodiment of the present application, the method for processing thermal runaway of a lithium ion battery pack further includes steps S140 to S160 as follows:

s140, if the gas pressure of the sub receiving space 141 is greater than the second preset pressure, controlling the dilution device 400 to input the dilution gas into the sub receiving space 141.

Specifically, if the gas pressure in the sub-receiving space 141 is greater than the second preset pressure, it indicates that the electrolyte 190 or the battery cell 160 in the lithium ion battery pack 100 has reacted violently, and a severe thermal runaway phenomenon occurs. The lithium ion battery pack 100 is at any time in danger of fire or explosion. At this time, the gas storage device 300 is used to absorb the flammable gas mixture in the sub-receiving space 141, so that the thermal runaway reaction cannot be effectively controlled, and the controller 500 closes the connection between the housing 10 and the gas storage device 300, so as to connect the dilution device 400 and the housing 10.

The dilution device 400 stores the dilution gas therein. The diluent gas is a non-flammable shielding gas. The shielding gas may be CO₂A gas. The gas mixture inside the shell 10 is combustible gas H2_、CO and CH₄And the like.

In this embodiment, the non-flammable shielding gas is introduced into the sub-receiving space 141 through the dilution device 400, so that the concentration of the flammable gas in the sub-receiving space 141 can be effectively diluted, and further development of the thermal runaway reaction can be effectively inhibited.

And S160, returning to the step S100.

In an embodiment of the present application, the step S140 includes:

and S141, controlling the second valve 136 to be opened, and controlling the first valve 135 to be closed and the third valve 137 to be closed for a preset time.

Specifically, the second valve 136 is connected to the gas storage device 300 through a gas pipeline, so that the controller 500 controls the second valve 136 to open, controls the second valve 136 and the third valve 137 to close, and connects the dilution device 400 to the sub-receiving space 141. The preset time is manually set by the lithium ion battery pack maintainer. By controlling the second valve 136 to be opened for a preset time, the combustible gas mixture and the non-combustible protective gas in the sub-receiving space 141 can be sufficiently mixed, and the effect of diluting the combustible gas mixture can be achieved.

S142, after the preset time is over, controlling the second valve 136 and the third valve 137 to open, and controlling the first valve 135 to close.

Specifically, the third valve 137 is disposed on the wall 130 of the housing 10, and is used for discharging the diluted mixed gas out of the housing 10. The third valve 137 may be connected to a processing device to collect the diluted mixed gas, thereby facilitating subsequent separate processing. The third valve 137 may also be directly connected to the outside, so as to discharge the diluted mixed gas to the outside. While the third valve 137 is opened, the second valve 136 is kept opened, so that the dilution gas continues to be filled into the sub-receiving space 141, further diluting the combustible gas mixture in the sub-receiving space 141.

In this embodiment, the controller 500 communicates the dilution device 400 with the lithium ion battery when a severe thermal runaway phenomenon occurs inside the lithium ion battery pack 100 by opening the second valve 136 and the third valve 137, so as to dilute the combustible gas mixture in the sub receiving space 141, thereby effectively controlling the further development of the thermal runaway reaction from inside the lithium ion battery pack 100.

In an embodiment of the present application, the method for processing thermal runaway of a lithium ion battery pack further includes the following step S170:

s170, if the gas pressure in the sub receiving space 141 is not greater than the first preset pressure, controlling the first valve 135, the second valve 136 and the third valve 137 to close.

Specifically, if the gas pressure in the sub-receiving space 141 is not greater than the first preset pressure, it indicates that the electrolyte 190 or the battery cell 160 in the lithium ion battery pack 100 has not reacted and a thermal runaway phenomenon has not occurred. The lithium ion battery pack 100 is in a relatively safe state.

The application provides a lithium ion battery processing method acquires through atmospheric pressure detection device 200 the gas pressure in the sub accommodation space 141 of lithium ion battery group 100, the basis the gas pressure and the first comparison result of predetermineeing pressure of sub accommodation space 141, and the gas pressure and the second comparison result of predetermineeing pressure of sub accommodation space 141, control gas storage device 300 accomodates gas mixture in the sub accommodation space 141 can effectively reduce and produce the thermal runaway reaction back, gas mixture's in the sub accommodation space 141 density avoids the inside 1 explosion and the fire of lithium ion battery group 100.

The application also provides a heat dissipation system of the lithium ion battery pack 100.

As shown in fig. 9, in an embodiment of the present application, the heat dissipation system of the lithium ion battery pack 100 includes the lithium ion battery pack 100 and the heat dissipation device 600 mentioned above. The heat sink 600 is in contact with the lithium ion battery pack 100.

The lithium ion battery pack 100 includes a case 10 and a plurality of battery cells 160 disposed in the case 10. The heat sink 600 is used to transfer heat inside the lithium ion battery pack 100 to the outside when thermal runaway occurs in the lithium ion battery pack 100. The heat sink 600 includes a heat-dissipating coil 610. The heat dissipation coil 610 is wound around the outer surface of the housing 10.

Specifically, the heat dissipation coil 610 is made of a high temperature resistant material and a material having excellent thermal conductivity. Optionally, the material of the heat dissipation coil 610 is ceramic. The size of the heat dissipation coil 610 is matched with the size of the housing 10 so that the heat dissipation coil 610 is in close and sufficient contact with the housing 10.

In this embodiment, the heat dissipation system of the lithium ion battery pack 100 winds the heat dissipation coil 610 on the outer surface of the casing 10 of the lithium ion battery pack 100, so that when a thermal runaway reaction occurs in the lithium ion battery pack 100, a part of heat generated inside the lithium ion battery pack 100 is timely transmitted to the heat dissipation coil 610, thereby reducing the potential safety hazard of the lithium ion battery pack 100 under the thermal runaway.

With continued reference to fig. 9, in an embodiment of the present application, the heat-dissipating coil 610 is provided with a heat-dissipating coil cavity 611. The heat dissipation coil cavity 611 contains circulating water.

Specifically, the circulating water in the cavity 611 of the heat dissipation coil can be replaced at regular time, so as to maintain the excellent heat dissipation performance of the heat dissipation coil 610. Other excellent heat conducting media can be contained in the heat dissipation coil cavity 611.

As shown in fig. 10, in an embodiment of the present application, the heat dissipation apparatus 600 further includes a water-cooling heat dissipation unit 620. The water-cooling heat dissipation unit 620 is connected to the heat dissipation coil 610 through a water pipeline. The water-cooled heat dissipation unit 620 includes a water tank 621 and a water pump 622. The water tank 621 is connected to the heat dissipation coil 610 through a waterway pipe. The water pump 622 is disposed on a waterway pipeline between the water tank 621 and the heat dissipation coil 610. The water pump 622 is used for conveying circulating water in the water tank 621 to the heat dissipation coil 610, so as to realize heat exchange between the water tank 621 and the lithium ion battery pack 100.

In this embodiment, by providing the water-cooling heat dissipation unit 620, the circulating water in the water tank 621 in the water-cooling heat dissipation unit 620 can be conveyed to the heat dissipation coil 610 through the water pump 622, and after the heat exchange between the circulating water in the heat dissipation coil 610 and the housing 10 of the lithium ion battery pack 100 is completed, the circulating water is input into the water tank 621 again, so that the circulating heat dissipation is realized, the cost is low, and the implementation difficulty is small.

With continued reference to fig. 10, in one embodiment of the present application, the water tank 621 includes a water outlet 623 and a water inlet 624. The water pump 622 includes a first pump port 625 and a second pump port 626. The heat dissipation coil 610 includes a first nozzle 612 and a second nozzle 613. The water outlet 623 is connected to the first pump port 625 via a waterway pipe, the second pump port 626 is connected to the first nozzle 612 via a waterway pipe, and the second nozzle 613 is connected to the water inlet 624 via a waterway pipe.

Specifically, the circulating water in the water tank 621 flows out through the water outlet 623, flows into the water pump 622 through the first pump port 625, and flows out of the water pump 622 through the second pump port 626. After the circulating water flows out of the water pump 622, the circulating water enters the heat dissipation coil 610 through the first pipe port 612, exchanges heat with the housing 10, flows into the water inlet 624 through the second pipe port 613, and then returns to the water tank 621 to realize circulating heat dissipation.

As shown in fig. 11, in an embodiment of the present application, the heat dissipation device 600 further includes a heat dissipation core 630. The heat sink 630 is provided with a heat sink cavity 631, and the heat sink cavity 631 contains a heat conducting medium.

Specifically, the heat dissipation core 630 is made of a high temperature resistant material and a material having excellent thermal conductivity. Optionally, the material of the heat dissipation core 630 is ceramic.

As shown in fig. 12, in an embodiment of the present application, the battery cell 160 includes a positive electrode tab 161 and a negative electrode tab 162. The positive electrode plate 161 and the negative electrode plate 162 are wound into a cylindrical shape with the heat dissipation core 630 as an axis, and are attached to the heat dissipation core 630.

Specifically, in the production process of the lithium ion battery pack 100, the heat dissipation core 630, the positive electrode tab 161 and the negative electrode tab 162 may be wound together to form the battery cell 160. When the lithium ion battery pack 100 is in normal operation, the heat dissipation core 630 may take away heat generated in the battery cell 160 in case of thermal runaway.

With continued reference to fig. 11, in an embodiment of the present application, the heat dissipation device 600 further includes an air-cooled heat dissipation unit 640. The air-cooled heat dissipation unit 640 includes a heat sink 641 and a heat dissipation duct 642. The heat dissipation pipe 642 is disposed between the heat sink 641 and the heat dissipation core 630. The radiator 641 is used for exchanging heat with air. The heat sink 641 is used for transferring the heat of the heat dissipating core 630 to the heat sink 641.

Specifically, the heat sink 641 may be provided with a plurality of heat dissipation fins and a plurality of fans.

In this embodiment, by providing the heat dissipation core 630 and the air-cooled heat dissipation unit 640, when the thermal runaway phenomenon occurs in the lithium ion battery pack 100, not only the heat dissipation core 630 can achieve a heat dissipation effect, but also the heat generated in the battery cell 160 can be continuously conducted to the heat sink 641 through the heat dissipation pipeline 642, so that high-efficiency heat dissipation is achieved.

The two ends of the heat dissipation core 630 are respectively provided with a connection buckle 632, and one end of the heat dissipation pipe 642 is fastened with the connection buckle 632. The other end of the heat dissipation pipe 642 is fixedly connected to the heat sink 641.

Specifically, the connection manner of the heat dissipation core 630 and the heat sink 641 may not be limited, and the heat dissipation core may be connected to the heat dissipation core via other contact manners besides the connection via the connection clip 632.

In one embodiment of the present application, the housing 10 further includes a top cover plate 110, a bottom base plate 120, and a plurality of wall plates 130 connected end to end in sequence. The top cover plate 110, the bottom shim plate 120 and the plurality of wall plates 130 together form a receiving space 140. The top cover plate 110 and the bottom backing plate 120 are respectively provided with a positioning hole 180, so that the connecting fasteners 632 at the two ends of the heat dissipating core 630 can extend out of the housing 10 through the positioning holes 180.

In this embodiment, the positioning hole 180 is disposed to enable the heat dissipation core 630 to extend out of the housing 10, so as to facilitate connection between the heat dissipation core 630 and the heat sink 641.

In an embodiment of the present application, the heat dissipation system of the lithium ion battery pack 100 further includes a bracket 150. The bracket 150 is disposed in the receiving space 140, and is used for dividing the receiving space 140 into a plurality of sub-receiving spaces 141.

The foregoing contents are mentioned in this embodiment, and are not described herein again.

As shown in fig. 13, in an embodiment of the present application, each of the battery cells 160 is disposed in one of the sub-receiving spaces 141. One air-cooled heat dissipation unit 640 is disposed in each of the sub-receiving spaces 141.

The foregoing contents are mentioned in this embodiment, and are not described herein again. In this embodiment, through setting up a plurality of sub-accommodation spaces 141, and with a plurality of sub-accommodation spaces 141 correspond air-cooled radiating unit 640 makes when a plurality of sub-accommodation spaces 141 take place the thermal runaway phenomenon simultaneously, and is a plurality of air-cooled radiating unit 640 can be right simultaneously lithium ion battery group 100 produces good radiating effect, works as when the thermal runaway phenomenon takes place simultaneously for single sub-accommodation space 141, also can not waste the resource, and the radiating mode is nimble and the radiating efficiency is high, and the radiating rate is fast.

On one hand, the heat dissipation system of the lithium ion battery pack 100 is formed by winding the heat dissipation coil 610 on the outer surface of the shell 10 of the lithium ion battery pack 100 to form the water-cooling heat dissipation unit 620, so that when a thermal runaway reaction occurs in the lithium ion battery pack 100, a part of heat generated in the lithium ion battery pack 100 is transmitted to the heat dissipation coil 610 in time, and thus the potential safety hazard of the lithium ion battery pack 100 under the thermal runaway is reduced; on the other hand, through in lithium ion battery group 100 electricity core 160 inside set up contain the heat dissipation core 630 of heat-conducting medium and with heat dissipation core 630 is connected radiator 641 forms air-cooled radiating element 640 makes lithium ion battery group 100 when taking place the thermal runaway reaction, water-cooled radiating element 620 with air-cooled radiating element 640 combined action is right lithium ion battery group 100's inside is effectively cooled down, suppresses lithium ion battery group 100 thermal runaway reaction's further development.

The application also provides another lithium ion battery pack thermal runaway processing system and method.

As shown in fig. 14, in an embodiment of the present application, the thermal runaway system of the lithium ion battery pack 100 includes the lithium ion battery pack 100 mentioned above, an electrolyte pumping device 700, a temperature detection device 800, and the controller 500 mentioned above. The lithium ion battery pack 100 includes a case 10, a plurality of battery cells 160 disposed in the case 10, and the electrolyte 190 filled in the case 10. The electrolyte suction device 700 is connected to the case 10. The temperature detecting device 800 is fixedly disposed on the inner wall of the housing 10. The controller 500 is electrically connected to the electrolyte suction device 700 and the temperature detection device 800, respectively. The temperature detecting device 800 is used for detecting the temperature inside the housing 10. The controller 500 is configured to control the electrolyte suction device 700 to suck out the electrolyte 190 in the housing 10.

Specifically, the electrolyte suction device 700 may receive the electrolyte 190 drawn out of the case 10. The capacity of the electrolyte suction device 700 is greater than or equal to the capacity of the casing 10, so that when the lithium ion battery pack 100 has a thermal runaway phenomenon with a high risk coefficient, the electrolyte suction device 700 can suck out all the electrolyte 190 in the casing 10, and the reaction source of the thermal runaway reaction is cut off.

The temperature detection device 800 may be a temperature sensor. The temperature sensor may be plural. When the temperature sensor is a plurality of temperature sensors, the controller 500 may detect a plurality of internal temperatures of the housing 10 obtained by the temperature detection device 800, and take an average value of the internal temperatures of the housing 10 as a final detection value, so that a detection result of the internal temperature of the housing 10 is accurate and close to an actual value.

In this embodiment, this application provides lithium ion battery group thermal runaway processing system, on the one hand, through setting up temperature-detecting device 800 at lithium ion battery group 100's casing 10 inner wall, can real time monitoring lithium ion battery group 100's inside temperature condition for after the thermal runaway phenomenon takes place, the control personnel can be according to lithium ion battery group 100's inside temperature condition can in time discover the thermal runaway phenomenon and implement the solution. On the other hand, the casing 10 of the lithium ion battery pack 100 is connected with the electrolyte suction device 700, so that when a thermal runaway phenomenon occurs inside the lithium ion battery pack 100, the electrolyte 190 inside the casing 10 of the lithium ion battery pack 100 is sucked out through the electrolyte suction device 700, and the electrolyte 190 inside the lithium ion battery pack 100 is prevented from continuously and violently reacting, so that a reaction source of the thermal runaway reaction is fundamentally cut off, and the development of the thermal runaway reaction is effectively restrained from inside the lithium ion battery pack 100.

In an embodiment of the present application, the lithium ion battery pack 100 includes the housing 10 and the bracket 150. The housing 10 includes a top cover plate 110, a bottom backing plate 120, and a plurality of wall plates 130 connected end to end in sequence. The top cover plate 110, the bottom shim plate 120 and the plurality of wall plates 130 together form a receiving space 140. The bracket 150 is disposed in the receiving space 140, and is used for dividing the receiving space 140 into a plurality of sub-receiving spaces 141.

In an embodiment of the present application, each of the battery cells 160 is disposed in one of the sub-receiving spaces 141, and each of the battery cells 160 is electrically connected to the top cover plate 110.

As shown in fig. 15, in an embodiment of the present application, the electrolyte suction device 700 is multiple, and each electrolyte suction device 700 sucks the electrolyte 190 in one of the sub-receiving spaces 141.

In this embodiment, by disposing a plurality of the electrolyte suction devices 700 in each of the sub-receiving spaces 141, when a thermal runaway phenomenon occurs in a part of the sub-receiving spaces 141, only the electrolyte 190 in the sub-receiving space 141 in which the thermal runaway phenomenon occurs is sucked, and other normal sub-receiving spaces 141 are not subjected to an image, so that the lithium ion battery pack 100 can continue to operate normally, and is flexible and reduces cost.

With continued reference to fig. 15, in an embodiment of the present application, the wall 130 is formed with a plurality of openings 138, and each electrolyte pumping device 700 is connected to one of the openings 138 through a transmission pipe 191.

Specifically, the electrolyte suction device 700 is connected to the case 10 through the opening 138.

Referring to fig. 15, in an embodiment of the present application, the electrolyte pumping device 700 includes an electrolyte storage tank 710, a volume detection assembly 720, a pumping device valve 730, and a first pressure pump 740. The electrolyte storage tank 710 is connected with the opening 138 through the transmission pipeline 191. And a capacity sensing assembly 720 fixedly disposed in the electrolyte storage tank 710. The suction device valve 730 is disposed on the transmission pipeline 191. The first pressure pump 740 is disposed on the transmission pipeline 191. The electrolyte storage tank 710 is used to store the electrolyte 190 sucked out of the case 10. The capacity sensing assembly 720 is used to sense the capacity of the electrolyte 190 stored in the electrolyte storage tank 710. The first pressure pump 740 is used for providing power for the electrolyte pumping device 700 to pump out the electrolyte 190.

Specifically, capacity sensing assembly 720 is configured to sense the capacity of electrolyte 190 stored in electrolyte storage tank 710. The electrolyte storage box 710 is provided with a prompting lamp on the surface. When the electrolyte 190 stored in the electrolyte storage tank 710 exceeds a preset threshold value, the indicator lamp flashes to indicate that the electrolyte storage tank 710 needs to be cleaned.

As shown in fig. 15, in an embodiment of the present application, the thermal runaway processing system of the lithium ion battery pack further includes an electrolyte recovery device 900. The electrolyte recovery device 900 is connected to the plurality of electrolyte suction devices 700 through a recovery pipe 192. The electrolyte recovery unit 900 is used for collecting the electrolyte 190 stored in the plurality of electrolyte suction units 700. The electrolyte recovery device 900 is further electrically connected to the controller 500, and is configured to receive control information of the controller 500 and deliver the electrolyte 190 stored in the plurality of electrolyte suction devices 700 to the electrolyte recovery device 900.

Specifically, the electrolyte recovery device 900 is a closed container for collecting the electrolyte 190 sucked from the casing 10 by the electrolyte suction device 700. The electrolyte 190 is obtained by pumping after the thermal runaway reaction of the lithium ion battery pack, and belongs to waste electrolyte, and the electrolyte recovery device 900 is used for uniformly recovering or storing the electrolyte 190 to prevent environmental pollution.

Referring to fig. 15, in an embodiment of the present application, the electrolyte recovery device 900 includes an electrolyte recovery tank 910, a recovery device valve 920, and a second pressure pump 930. The electrolyte recovery tank 910 is connected to the plurality of electrolyte storage tanks 710 through the recovery pipe 192. The recycling device valve 920 is disposed in the recycling pipe 192. The second pressure pump 930 is disposed in the recovery pipe 192. The electrolyte recovery tank 910 is used to collect the electrolyte 190 stored in the plurality of electrolyte storage tanks 710. The second pressure pump 930 is used to power the transfer of the electrolyte 190 stored in the electrolyte storage tank 710 to the electrolyte recovery tank 910.

In this embodiment, the electrolyte recycling device 900 recycles the electrolyte 190 in the electrolyte storage tanks 710 to the electrolyte recycling tank 910 through the combined action of the recycling device valve 920 and the second pressure pump 930, so as to realize the unified recycling of the waste electrolyte after the thermal runaway phenomenon occurs, recycle the electrolyte 190 in the electrolyte storage tanks 710 at the same time, and have high efficiency and save manpower and material resources.

The application provides a thermal runaway processing system of a lithium ion battery pack. The thermal runaway processing system of the lithium ion battery pack comprises the lithium ion battery pack 100, an electrolyte suction device 700, a temperature detection device 800 and a controller 500. The lithium ion battery pack 100 includes a case 10, a plurality of battery cells 160 disposed in the case 10, and an electrolyte 190 filled in the case 10. The electrolyte suction device 700 is connected to the housing 10, and the temperature detection device 800 is fixedly disposed on the inner wall of the housing 10. According to the thermal runaway processing system of the lithium ion battery pack, on one hand, the temperature detection device 800 is arranged on the inner wall of the shell 10 of the lithium ion battery pack 100, so that the internal temperature condition of the lithium ion battery pack 100 can be monitored in real time, and after a thermal runaway phenomenon occurs, a monitoring person can find the thermal runaway phenomenon in time and implement a solution according to the internal temperature condition of the lithium ion battery pack 100; on the other hand, the casing 10 of the lithium ion battery pack 100 is connected with the electrolyte suction device 700, so that when a thermal runaway phenomenon occurs inside the lithium ion battery pack 100, the electrolyte 190 inside the casing 10 of the lithium ion battery pack 100 is sucked out through the electrolyte suction device 700, and the electrolyte 190 inside the lithium ion battery pack 100 is prevented from continuously and violently reacting, so that a reaction source of the thermal runaway reaction is fundamentally cut off, and the development of the thermal runaway reaction is effectively restrained from inside the lithium ion battery pack 100.

The application also provides a thermal runaway treatment method of the lithium ion battery pack.

In an embodiment of the present application, the method for processing thermal runaway of a lithium ion battery pack includes the following steps S200 to S240:

s200, receiving the internal temperature of the housing 10 obtained by the temperature detection device 800.

Specifically, the temperature detection device 800 acquires the internal temperature of the housing 10 and transmits the internal temperature of the housing 10 to the controller 500.

S210, judging whether the internal temperature of the shell 10 is greater than the preset thermal runaway trigger temperature.

Specifically, after the controller 500 receives the internal temperature of the housing 10, the controller 500 retrieves the preset thermal runaway trigger temperature pre-stored in the monitoring module. The preset thermal runaway trigger temperature is preset by the lithium ion battery pack monitoring personnel. Further, the controller 500 compares the internal temperature of the housing 10 with the preset thermal runaway trigger temperature, and determines whether the internal temperature of the housing 10 is greater than the preset thermal runaway trigger temperature.

S220, if the internal temperature of the casing 10 is greater than the preset thermal runaway trigger temperature, controlling a valve 820 of a pumping device to open, controlling the first pressure pump 740 to open, and controlling the electrolyte pumping device 700 to suck the electrolyte 190 in the casing 10 into the electrolyte storage tank 710.

Specifically, if the internal temperature of the casing 10 is greater than the preset thermal runaway trigger temperature, the controller 500 determines that a thermal runaway phenomenon occurs inside the lithium ion battery pack 100, controls the first pressure pump 740 to be started, and controls the electrolyte pumping device 700 to pump the electrolyte 190 in the casing 10 into the electrolyte storage tank 710.

S240, continuously receiving the internal temperature of the casing 10 obtained by the temperature detection device 800 until the internal temperature of the casing 10 is lower than the preset thermal runaway trigger temperature, controlling the suction device valve 820 and the first pressure pump 740 to be closed, and controlling the electrolyte suction device 700 to stop working.

Specifically, the controller 500 may control the pumping power of the electrolyte pumping device 700 to accelerate the pumping operation of the electrolyte pumping device 700.

In this embodiment, the thermal runaway processing system and method for the lithium ion battery pack, provided by the application, obtain the internal temperature of the casing 10 of the lithium ion battery pack 100 through the temperature detection device 800, and further, control the electrolyte suction device 700 to suck the electrolyte 190 in the casing 10 into the electrolyte suction device 700 according to the comparison result between the internal temperature of the casing 10 and the preset thermal runaway trigger temperature, so that the internal electrolyte 190 in the lithium ion battery pack 100 can be effectively prevented from continuing to react, and the internal explosion and fire of the lithium ion battery pack 100 are avoided.

In an embodiment of the present application, the method for processing thermal runaway of a lithium ion battery pack includes steps S230 to S500:

s230, if the internal temperature of the housing 10 is not greater than the preset thermal runaway trigger temperature, controlling the pumping device valve 720 and the first pressure pump 740 to close.

Specifically, if the internal temperature of the casing 10 is not greater than the preset thermal runaway trigger temperature, the controller 500 determines that the internal temperature of the lithium ion battery pack 100 has recovered to normal and the thermal runaway phenomenon has been effectively controlled, and may perform subsequent electrolyte 190 recovery work.

S250, receiving the volume of the electrolyte 190 in the electrolyte storage tank 710 obtained by the volume detection component 720.

Specifically, the outer surface of the electrolyte storage tank 710 may be provided with an electrolyte metering assembly. The electrolyte measurement module is coupled to the capacity detection module 720 so that a maintenance person of the lithium ion battery pack 100 can visually know the capacity of the electrolyte 190 in the electrolyte storage tank 710.

S260, judging whether the capacity of the electrolyte 190 in the electrolyte storage tank 710 is larger than the preset electrolyte capacity.

Specifically, the preset electrolyte capacity is manually set by the maintainer of the lithium ion battery pack 100.

S270, if the capacity of the electrolyte 190 in the electrolyte storage tank 710 is greater than the preset electrolyte capacity, controlling the valve 920 of the recycling device to open, controlling the second pressure pump 930 to open, and controlling the electrolyte recycling device 900 to suck the electrolyte 190 in the electrolyte storage tank 710 into the electrolyte recycling tank 910.

Specifically, if the capacity of the electrolyte 190 in the electrolyte storage tank 710 is greater than the preset electrolyte capacity, the controller 500 determines that the capacity of the electrolyte 190 in the electrolyte storage tank 710 needs to be recovered, otherwise, the electrolyte 190 in the electrolyte storage tank 710 is accumulated, and the subsequent electrolyte pumping operation is affected.

S280, continuously receiving the volume of the electrolyte 190 in the electrolyte storage tank 710 obtained by the volume detection module 720 until the volume of the electrolyte 190 in the electrolyte storage tank 710 is smaller than the preset electrolyte volume, controlling the recovery device valve 920 and the second pressure pump 930 to close, and controlling the electrolyte recovery device 900 to stop working.

Specifically, if the capacity of the electrolyte 190 in the electrolyte storage tank 710 is not greater than the preset electrolyte capacity, the controller 500 determines that the capacity of the electrolyte 190 in the electrolyte storage tank 710 is low, and the electrolyte is not required to be recycled, and the subsequent electrolyte pumping operation is not affected.

The application provides a thermal runaway treatment method for a lithium ion battery pack. On one hand, the lithium ion battery processing method includes the steps that the temperature inside the shell 10 of the lithium ion battery pack 100 is obtained through the temperature detection device 800, the electrolyte suction device 700 is controlled to suck the electrolyte 190 in the shell 10 into the electrolyte suction device 700 according to the comparison result of the temperature inside the shell 10 and the preset thermal runaway trigger temperature, the electrolyte 190 inside the lithium ion battery pack 100 can be effectively prevented from continuously reacting, and explosion and fire in the lithium ion battery pack 100 are avoided. On the other hand, the electrolyte 190 stored in the electrolyte suction device 700 is recovered to the electrolyte recovery device 900 through the electrolyte recovery device 900, so that the unified recovery processing is facilitated, and the cleaning and the environmental protection are realized.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A thermal runaway processing system for a lithium ion battery pack, comprising:

a lithium ion battery pack (100) comprising a housing (10) and a plurality of cells (160) disposed within the housing (10);

the air pressure detection device (200) is arranged in the shell (10) and is used for detecting the air pressure in the shell (10);

the gas storage device (300) is connected with the lithium ion battery pack (100) through a gas pipeline;

a dilution device (400) connected with the lithium ion battery pack (100) through a gas pipeline;

and the controller (500) is electrically connected with the air pressure detection device (200), the air storage device (300) and the dilution device (400) respectively and is used for controlling the air storage device (300) or the dilution device (400) to adjust the air pressure in the shell (10) according to the air pressure in the shell (10).

2. The lithium ion battery pack thermal runaway processing system according to claim 1, wherein the casing (10) comprises a top cover plate (110), a bottom gasket plate (120), and a plurality of wall plates (130) connected end to end in sequence, the top cover plate (110), the bottom gasket plate (120), and the plurality of wall plates (130) together surrounding a receiving space (140).

3. The lithium ion battery pack thermal runaway processing system according to claim 2, characterised in that the housing (10) further comprises a support (150), the support (150) being provided to the receiving space (140) for dividing the receiving space (140) into a plurality of sub-receiving spaces (141).

4. The lithium ion battery pack thermal runaway processing system according to claim 3, characterized in that each of the battery cells (160) is disposed in one of the sub-receiving spaces (141), and each of the battery cells (160) is electrically connected to the top cover plate (110).

5. The lithium ion battery pack thermal runaway processing system of claim 4, wherein the battery cell (160) comprises:

a positive electrode plate (161);

the negative pole piece (162), the positive pole piece (161) and the negative pole piece (162) are winded into a cylinder shape;

the positive pole lug (163) is arranged on one side, close to the top cover plate (110), of the battery cell (160) and is electrically connected with the positive pole piece (161); and

and the negative pole tab (164) is arranged on one side, close to the top cover plate (110), of the battery cell (160) and is electrically connected with the negative pole piece (162).

6. The thermal runaway processing system for a lithium ion battery pack according to claim 5, characterised in that the bottom surface of the top cover plate (110) is provided with a plurality of grooves (111), each positive electrode tab (163) is in contact connection with one groove (111), and each negative electrode tab (164) is in contact connection with one groove (111).

7. The lithium ion battery pack thermal runaway processing system according to claim 6, characterised in that the top cover plate (110) is made of an electrically conductive material and is coated with an insulating varnish on the bottom surface of the top cover plate (110) except for the grooves (111).

8. The lithium ion battery pack thermal runaway processing system according to claim 7, characterized in that the top surface of the bracket (150) is fixedly connected with the bottom surface of the top cover plate (110), the bottom surface of the bracket (150) is fixedly connected with the top surface of the bottom gasket plate (120) to form the enclosed sub-receiving space (141), and the surface of the bracket (150) and the top surface of the bottom gasket plate (120) are coated with an insulating varnish.

9. The lithium ion battery pack thermal runaway processing system according to claim 8, characterised in that one gas pressure detection means (200) is arranged in each sub-receiving space (141) for detecting the gas pressure in each sub-receiving space (141).

10. The li-ion battery pack thermal runaway processing system according to claim 9, wherein the wall plate (130) defines a plurality of first valves (135), a plurality of second valves (136), and a plurality of third valves (137), each of the sub-receiving spaces (141) having a corresponding one of the first valves (135), one of the second valves (136), and one of the third valves (137);

the plurality of first valves (135) are connected with the gas storage device (300) through gas pipelines;

the plurality of third valves (137) are connected with the dilution device (400) through gas pipes.