Battery thermal runaway gas leading-out device and battery pack
By designing a battery thermal runaway gas extraction device, including a drainage pipe and a venting pipe, the problem of high-temperature and high-pressure flammable gas being unable to be discharged during thermal runaway of lithium-ion batteries has been solved, thereby improving safety performance and efficiently extracting gas, and reducing production costs.
Patent Information
- Application Number
- CN202423250023.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-27
AI Technical Summary
When lithium-ion batteries experience thermal runaway, they cannot promptly expel the high-temperature, high-pressure flammable gases inside the cell, leading to the spread of thermal runaway and posing a safety hazard.
Design a battery thermal runaway gas exhaust device, including a drainage pipe, an explosion-proof valve, and a drainage pipe. The explosion-proof valve guides high-temperature and high-pressure combustible gas into the drainage pipe, and the gas is discharged through the drainage pipe. The structural design of the drainage pipe and the drainage pipe enables the gas to be discharged from multiple battery cells.
It effectively prevents the spread of thermal runaway in lithium-ion batteries, improves safety performance, reduces production costs, facilitates implementation, enhances practicality, prevents gas leakage and backflow, and improves gas extraction efficiency.
Smart Images
Figure CN223858366U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to new energy battery technical field especially relates to a battery thermal runaway gas's
[0002] Export device and battery pack. BACKGROUND
[0003] The application field of lithium ion battery is very extensive, in recent years along with the further development of lithium ion battery energy storage field, the safe use of lithium ion battery also receives the attention. Due to the principle and structural characteristics of lithium ion battery, under the influence of overcharge, overdischarge, overheating, mechanical impact and other factors, the battery separator collapse and internal short circuit are easily caused, thereby leading to thermal runaway.
[0004] When lithium ion battery occurs thermal runaway, a large amount of high-temperature and high-pressure combustible gas is generated in the cell, and the high-temperature and high-pressure combustible gas in the cell cannot be discharged in time, which will cause the thermal runaway of lithium ion battery to spread, thereby causing greater safety accidents. UTILITY MODEL CONTENTS
[0005] The utility model discloses a battery thermal runaway gas's export device and battery pack can export the high-temperature and high-pressure combustible gas in the cell quickly when lithium ion battery occurs thermal runaway, thereby preventing the thermal runaway of lithium ion battery from spreading, and improving the safety performance of lithium ion battery.
[0006] The utility model discloses a battery thermal runaway gas's export device, including being arranged on each cell's drain pipe, the explosion -proof valve being arranged at the bottom of each drain pipe respectively, and the dredging pipe that is communicated with the top of each drain pipe simultaneously, the explosion -proof valve with drain pipe is integral type structure, and the thermal runaway gas of cell enters drain pipe through explosion -proof valve, and the dredging pipe is used to export the thermal runaway gas in drain pipe.
[0007] Further, the explosion -proof valve includes the explosion -proof sheet arranged at the bottom of the drain pipe and the notch arranged on the inner side of the explosion -proof sheet, the top of the cell is provided with the inlay groove, and the explosion -proof sheet is fixedly installed in the inlay groove.
[0008] Further, the dredging pipe includes a plurality of branch pipes extending along the Y-axis direction and a plurality of bus pipes extending along the X-axis direction, the plurality of branch pipes are arranged at intervals, and each branch pipe is communicated with the top of a plurality of drain pipes on a column of cells simultaneously, and the bus pipe is communicated with one end of a plurality of branch pipes simultaneously.
[0009] Further, the branch pipe is provided with a flow guide channel, one end of the flow guide channel penetrates the branch pipe, the bus pipe is provided with a bus channel, and the bus channel is communicated with one end of a plurality of flow guide channels penetrating the branch pipe simultaneously.
[0010] Further, the branch pipe is provided with a plurality of drainage connection ports in the axial direction, and the plurality of top portions of the drainage pipes are respectively inserted into the plurality of bottom portions of the drainage connection ports, and the top portions of the plurality of drainage connection ports are communicated by the flow guide channel.
[0011] Further, the top portion of the drainage connection port is higher than the bottom portion of the flow guide channel.
[0012] Further, a sealing ring is arranged in the drainage connection port, and a sealing groove is arranged on the outer periphery of the drainage pipe, and the sealing ring is embedded in the sealing groove when the top portion of the drainage pipe is inserted into the drainage connection port.
[0013] Further, a plurality of check valves are arranged in the branch pipe, and the plurality of check valves are respectively arranged at the front ends of the plurality of drainage connection ports.
[0014] Further, the branch pipe is arranged at the top portion of the plurality of battery cells in an inclined manner, and the end of the branch pipe communicated with the bus pipe is lower than the end of the branch pipe away from the bus pipe.
[0015] The utility model also provides a battery pack, comprising the battery thermal runaway gas's leading-out device, still include battery box and be located in the plurality of battery cells of battery box, the plurality of battery cells are array distribution in battery box, the top portion of one end of the drainage pipe is communicated with the drainage pipe simultaneously, and the other end extends to the outside of battery box.
[0016] The battery thermal runaway gas leading-out device and the battery pack have the following beneficial effects:
[0017] (1) the leading-out device includes a plurality of drainage pipes, a plurality of explosion-proof valves and a bus pipe, the high-temperature and high-pressure combustible gas in the battery cell is discharged into the corresponding drainage pipe through the explosion-proof valve, and then is discharged into the bus pipe through the drainage pipe, and finally is discharged to the outside of the battery box through the drainage pipe, so that the leading-out device can simultaneously realize the discharge of the thermal runaway gas of the plurality of battery cells in the battery pack, prevent the thermal runaway of the battery cell from spreading, and further improve the safety performance of the lithium ion battery.
[0018] (2) the battery cell top of the leading-out device is provided with an embedding groove, when the drainage pipe is arranged on the battery cell, the explosion-proof sheet is embedded in the embedding groove and is fixedly connected with the battery cell, the bottom of the drainage pipe is fixed on the battery cell, the drainage pipe vertically extends upward on the battery cell, and the stability of the overall structure formed by the drainage pipe and the explosion-proof valve in the installation of the battery cell is enhanced.
[0019] (3) Each branch pipe of the present device can discharge the high-temperature and high-pressure combustible gas of a column of battery cells into the manifold pipe, so that the high-temperature and high-pressure combustible gas of multiple columns of battery cells is discharged into the manifold pipe through multiple branch pipes, thereby achieving the discharge of the high-temperature and high-pressure combustible gas in the multiple battery cells distributed in an array in the battery box, and making the pipeline of the present device simpler and more convenient, reducing the production cost, facilitating the implementation, and further improving the practicality of the present device;
[0020] (4) The branch pipe of the present device is provided with multiple drainage connection ports in the axial direction, the top of the multiple drainage pipes on a column of battery cells is respectively inserted into the bottom of the multiple drainage connection ports, and the drainage channel connects the top of the multiple drainage connection ports, so that the high-temperature and high-pressure combustible gas discharged into the drainage connection port can flow along the drainage channel and gather in the manifold channel from the end where the drainage channel and the manifold channel are connected, and then be discharged through the manifold channel, thereby preventing the spread of thermal runaway of the battery cells and improving the safety performance of the lithium ion battery;
[0021] (5) The top of the drainage connection port of the present device is higher than the bottom of the drainage channel, and when the top of the drainage pipe is inserted into the drainage connection port along the bottom of the drainage connection port, the high-temperature and high-pressure combustible gas discharged from the drainage pipe can be discharged into the drainage channel through the drainage connection port, and at the same time, the liquid deposited at the bottom of the drainage channel cannot flow back into the drainage pipe through the drainage connection port, thereby preventing the high-temperature and high-pressure combustible gas from flowing back into the battery cells after liquefaction, and further ensuring the performance of the lithium ion battery;
[0022] (6) The drainage connection port of the present device is provided with a sealing ring, and the outer periphery of the drainage pipe is provided with a sealing groove, which seals the connection between the drainage pipe and the drainage connection port by cooperation of the sealing ring and the sealing groove, preventing the high-temperature and high-pressure combustible gas discharged from the drainage pipe from leaking, thereby improving the discharge effect of the present device on the high-temperature and high-pressure combustible gas;
[0023] (7) The present device is provided with a non-return valve at the front end of each drainage connection port, so that the high-temperature and high-pressure combustible gas can only flow in the direction of the manifold channel in the drainage channel, and gather in the manifold channel from the end where the drainage channel and the manifold channel are connected, thereby preventing the high-temperature and high-pressure combustible gas from flowing back in the drainage channel, and further improving the discharge effect of the present device on the high-temperature and high-pressure combustible gas;
[0024] (8) The branch pipe of the present device is inclinedly arranged, and the end of the branch pipe connected to the manifold pipe is lower than the end of the branch pipe away from the manifold pipe, so that the high-temperature and high-pressure combustible gas flows faster in the direction of the manifold channel in the drainage channel, thereby improving the discharge efficiency of the present device on the high-temperature and high-pressure combustible gas, and preventing the high-temperature and high-pressure combustible gas from flowing back into the battery cells after liquefaction, and ensuring the performance of the lithium ion battery. BRIEF DESCRIPTION OF DRAWINGS
[0025] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements.
[0026] Fig. 1 A front view of a battery thermal runaway gas leading-out device according to an embodiment of the present application;
[0027] Fig. 2 An exploded view of a drainage tube and explosion-proof valve of a battery thermal runaway gas leading-out device according to an embodiment of the present application arranged on an electric core;
[0028] Fig. 3 A structure diagram of an explosion-proof valve of a battery thermal runaway gas leading-out device according to an embodiment of the present application arranged at the bottom of a drainage tube;
[0029] Fig. 4 A structure diagram of a dredging tube of a battery thermal runaway gas leading-out device according to an embodiment of the present application;
[0030] Fig. 5 A structure diagram of a drainage connection port of a battery thermal runaway gas leading-out device according to an embodiment of the present application;
[0031] Fig. 6 A structure diagram of a battery pack according to an embodiment of the present application.
[0032] In the drawings: 1, electric core; 11, inlay groove; 2, drainage tube; 21, sealing groove; 3, explosion-proof valve; 31, explosion-proof sheet; 32, score; 4, dredging tube; 41, branch pipe; 411, drainage connection port; 4111, sealing ring; 42, flow tube; 5, battery box. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application, and all other embodiments obtained by those skilled in the art on the premise of no creative labor based on the embodiments in the present application all belong to the scope of protection of the present application.
[0034] Please refer to Figs. 1-6The utility model discloses a battery thermal runaway gas's leading-out device, including the flow guide pipe 2 of setting respectively on every electric core 1, the explosion -proof valve 3 of setting respectively at the bottom of every flow guide pipe 2 and the dredging pipe 4 with every flow guide pipe 2's top communication simultaneously, the explosion -proof valve 3 and flow guide pipe 2 are integral structure, and the thermal runaway gas of electric core 1 enters flow guide pipe 2 through explosion -proof valve 3, and the thermal runaway gas in flow guide pipe 2 is led out with the dredging pipe 4.
[0035] In the application, the battery thermal runaway gas leading-out device includes the flow guide pipe 2, the explosion -proof valve 3 and the dredging pipe 4, the flow guide pipe 2 is arranged on the electric core 1, and the explosion -proof valve 3 is arranged at the bottom of the flow guide pipe 2. Since the explosion -proof valve 3 and the flow guide pipe 2 are of an integral structure, when the flow guide pipe 2 is arranged on the electric core 1, the explosion -proof valve 3 is fixedly connected with the electric core 1, the bottom of the flow guide pipe 2 is fixed on the electric core 1, the flow guide pipe 2 extends vertically upward on the electric core 1, and the dredging pipe 4 is in communication with the top of the flow guide pipe 2.
[0036] When the electric core 1 is in thermal runaway, a large amount of high-temperature and high-pressure combustible gas is generated in the electric core 1; when the high-temperature and high-pressure combustible gas in the electric core 1 accumulates to a certain degree, the explosion -proof valve 3 fixed on the electric core 1 is broken, the high-temperature and high-pressure combustible gas is discharged into the flow guide pipe 2, the high-temperature and high-pressure combustible gas flowing through the flow guide pipe 2 is discharged through the dredging pipe 4, thereby preventing the thermal runaway of the electric core 1 from spreading and improving the safety performance of the lithium ion battery.
[0037] The utility model discloses an embodiment further provides a battery pack, including above -mentioned battery thermal runaway gas's leading-out device, still include battery box 5 and be arranged in the multiple electric core 1 of battery box 5 in, multiple electric core 1 is in array distribution in battery box 5.
[0038] Therefore, in the application, the battery thermal runaway gas leading-out device includes multiple flow guide pipes 2 and multiple explosion -proof valves 3, the multiple flow guide pipes 2 are arranged on the multiple electric cores 1 of the same battery pack respectively, and the multiple explosion -proof valves 3 are arranged at the bottoms of the multiple flow guide pipes 2 respectively. The multiple flow guide pipes 2 are fixed on the multiple electric cores 1 respectively by fixedly connecting the explosion -proof valves 3 with the electric cores 1, the multiple flow guide pipes 2 extend vertically upward on the multiple electric cores 1 respectively, one end of the dredging pipe 4 is in communication with the tops of the multiple flow guide pipes 2 simultaneously, and the other end extends out of the battery box 5.
[0039] When one or more electric cores 1 in the battery box 5 are in thermal runaway, the explosion -proof valve 3 on the corresponding electric core 1 is broken, the high-temperature and high-pressure combustible gas is discharged into the corresponding flow guide pipe 2 through the explosion -proof valve 3, and then is collected in the dredging pipe 4 through the corresponding flow guide pipe 2, and finally is discharged out of the battery box 5 through the dredging pipe 4, so that the leading-out device can simultaneously discharge the thermal runaway gas of multiple electric cores 1 in the battery pack, prevent the thermal runaway of the electric cores 1 from spreading, and further improve the safety performance of the lithium ion battery.
[0040] In the embodiment, the explosion-proof valve 3 includes an explosion-proof sheet 31 arranged at the bottom of the drainage pipe 2, and a notch 32 arranged at the inner side of the explosion-proof sheet 31. The top of the battery cell 1 is provided with an inlay groove 11, and the explosion-proof sheet 31 is fixedly installed in the inlay groove 11. In the present application, the explosion-proof valve 3 includes the explosion-proof sheet 31 and the notch 32, the explosion-proof sheet 31 is arranged at the bottom of the drainage pipe 2, and the notch 32 is arranged at the inner side of the explosion-proof sheet 31.
[0041] The inlay groove 11 is arranged at the top of the battery cell 1, and when the drainage pipe 2 is arranged on the battery cell 1, the explosion-proof sheet 31 is inlaid with the inlay groove 11 and fixedly connected with the battery cell 1, the bottom of the drainage pipe 2 is fixed on the battery cell 1, and the drainage pipe 2 extends vertically upward on the battery cell 1, thereby enhancing the stability of the overall structure formed by the drainage pipe 2 and the explosion-proof valve 3 in the installation of the battery cell 1.
[0042] When the battery cell 1 has thermal runaway and generates a large amount of high-temperature and high-pressure combustible gas, the pressure in the battery cell 1 increases; when the pressure in the battery cell 1 reaches a critical value, the pressure of the high-temperature and high-pressure combustible gas will burst the explosion-proof sheet 31 along the notch 32, so that the high-temperature and high-pressure combustible gas can be discharged through the explosion-proof sheet 31 into the drainage pipe 2, and then discharged through the drainage pipe 4, thereby preventing the thermal runaway of the battery cell 1 from spreading and improving the safety performance of the lithium ion battery.
[0043] In the embodiment, the drainage pipe 4 includes a plurality of branch pipes 41 extending along the Y-axis direction, and a collecting pipe 42 extending along the X-axis direction, the plurality of branch pipes 41 are arranged at intervals, and each branch pipe 41 is in communication with the top of a plurality of drainage pipes 2 on a column of battery cells 1 at the same time, and the collecting pipe 42 is in communication with one end of the plurality of branch pipes 41 at the same time. When a plurality of battery cells 1 are arranged in an array in the battery box 5 of the battery pack, the arrangement of the battery cells 1 in the Y-axis direction is taken as a column, and the arrangement of the battery cells 1 in the X-axis direction is taken as a row, thereby forming a plurality of rows and a plurality of columns of battery cells 1.
[0044] In the present application, the drainage pipe 4 includes a plurality of branch pipes 41 and a collecting pipe 42, the plurality of branch pipes 41 extend along the Y-axis direction and are arranged at intervals, so that the positions of the plurality of branch pipes 41 correspond to the positions of the plurality of columns of battery cells 1 respectively. By making the top of a plurality of drainage pipes 2 on a column of battery cells 1 in communication with the corresponding branch pipe 41 at the same time, the high-temperature and high-pressure combustible gas in a column of battery cells 1 can be discharged through the drainage pipe 2 arranged thereon into the corresponding branch pipe 41.
[0045] The collecting pipe 42 extends along the X-axis direction, and one end of the plurality of branch pipes 41 is in communication with the collecting pipe 42 at the same time, so that the high-temperature and high-pressure combustible gas discharged into the plurality of branch pipes 41 can be collected in the collecting pipe 42, and finally discharged from the collecting pipe 42 to the outside of the battery box 5, thereby enabling the present drainage device to simultaneously discharge the thermal runaway gas of a plurality of battery cells 1 in the battery pack, preventing the thermal runaway of the battery cells 1 from spreading, and further improving the safety performance of the lithium ion battery.
[0046] In the present application, since each branch pipe 41 can discharge the high-temperature and high-pressure combustible gas of one row of battery cells 1 into the collecting pipe 42, the high-temperature and high-pressure combustible gas of multiple rows of battery cells 1 is discharged into the collecting pipe 42 through multiple branch pipes 41, thereby achieving the discharge of the high-temperature and high-pressure combustible gas in the multiple battery cells 1 arranged in an array in the battery box 5, and making the pipeline of the present discharge device simpler and more convenient, reducing the production cost, facilitating the implementation, and further improving the practicality of the present discharge device.
[0047] In the present embodiment, the flow guide channel is arranged in the branch pipe 41 and penetrates the branch pipe 41 at one end. The flow collecting channel is arranged in the collecting pipe 42 and communicates with multiple flow guide channels at the end of the flow guide channel penetrating the branch pipe 41, so that the high-temperature and high-pressure combustible gas discharged into the branch pipe 41 can only be collected in the flow collecting channel from the end of the flow guide channel communicating with the flow collecting channel when flowing in the flow guide channel, and then discharged through the flow collecting channel, thereby preventing the spread of thermal runaway of the battery cells 1 and improving the safety performance of the lithium ion battery.
[0048] In the present embodiment, multiple flow guide connection ports 411 are arranged on the branch pipe 41 in the axial direction, the top portions of multiple flow guide pipes 2 on one row of battery cells 1 are respectively inserted into the bottom portions of the multiple flow guide connection ports 411, and the flow guide channel communicates the top portions of the multiple flow guide connection ports 411. In the previous embodiment, it is mentioned that the branch pipe 41 extends along the Y-axis direction and simultaneously communicates with the top portions of the multiple flow guide pipes 2 on one row of battery cells 1. Specifically, in the present application, multiple flow guide connection ports 411 are arranged on each branch pipe 41 in the axial direction.
[0049] The positions of the multiple flow guide connection ports 411 correspond to the positions of the flow guide pipes 2 on one row of battery cells 1, the top portions of the flow guide pipes 2 are inserted into the corresponding flow guide connection ports 411, thereby achieving that each branch pipe 41 simultaneously communicates with the top portions of the multiple flow guide pipes 2 on one row of battery cells 1, and the high-temperature and high-pressure combustible gas in one row of battery cells 1 can be discharged into the corresponding flow guide connection ports 411 through the flow guide pipes 2 arranged thereon.
[0050] The flow guide channel arranged in the branch pipe 41 communicates the multiple flow guide connection ports 411 arranged on the branch pipe 41, so that the high-temperature and high-pressure combustible gas discharged into the flow guide connection ports 411 can flow along the flow guide channel, be collected in the flow collecting channel from the end of the flow guide channel communicating with the flow collecting channel, and then be discharged through the flow collecting channel, thereby preventing the spread of thermal runaway of the battery cells 1 and improving the safety performance of the lithium ion battery.
[0051] In actual implementation, when the high-temperature and high-pressure combustible gas flows along the flow channel, part of the high-temperature and high-pressure combustible gas is condensed into liquid and deposited at the bottom of the flow channel. It is possible that the liquid flows back to the flow pipe 2 through the flow connection port 411 and then flows back to the battery cell 1 through the flow pipe 2, which affects the use of the battery.
[0052] Therefore, in the embodiment, the top of the flow connection port 411 is arranged to be higher than the bottom of the flow channel. When the top of the flow pipe 2 is inserted into the flow connection port 411 along the bottom of the flow connection port 411, the high-temperature and high-pressure combustible gas discharged from the flow pipe 2 can be discharged into the flow channel through the flow connection port 411, and the liquid deposited at the bottom of the flow channel cannot flow back to the flow pipe 2 through the flow connection port 411, thereby preventing the liquefied high-temperature and high-pressure combustible gas from flowing back to the battery cell 1, and further ensuring the performance of the lithium ion battery.
[0053] Further, in the embodiment, the flow connection port 411 is provided with a sealing ring 4111, and the outer periphery of the flow pipe 2 is provided with a sealing groove 21. When the top of the flow pipe 2 is inserted into the flow connection port 411 along the bottom of the flow connection port 411, the sealing ring 4111 arranged in the flow connection port 411 is sleeved on the outer periphery of the flow pipe 2 until the sealing ring 4111 is embedded in the sealing groove 21 of the outer periphery of the flow pipe 2, thereby sealing the connection between the flow pipe 2 and the flow connection port 411 through the cooperation of the sealing ring 4111 and the sealing groove 21, preventing the high-temperature and high-pressure combustible gas discharged from the flow pipe 2 from leaking, and further improving the discharge effect of the discharge device on the high-temperature and high-pressure combustible gas.
[0054] In the foregoing embodiment, it is mentioned that the branch pipe 41 is provided with a plurality of flow connection ports 411 along the axial direction. When the high-temperature and high-pressure combustible gas discharged into the branch pipe 41 through the flow connection ports 411 flows in the flow channel, the high-temperature and high-pressure combustible gas can only be collected in the confluence channel from the end where the flow channel and the confluence channel communicate.
[0055] Specifically, in the embodiment, a plurality of check valves are arranged in the branch pipe 41, and the plurality of check valves are arranged at the front ends of the plurality of flow connection ports 411. When the high-temperature and high-pressure combustible gas in the row of battery cells 1 is discharged into the branch pipe 41 through the plurality of flow connection ports 411, the check valves arranged at the front ends of the plurality of flow connection ports 411 enable the high-temperature and high-pressure combustible gas to flow in the flow channel only in the direction of the confluence channel, and the high-temperature and high-pressure combustible gas is collected in the confluence channel from the end where the flow channel and the confluence channel communicate, thereby preventing the high-temperature and high-pressure combustible gas from flowing back in the flow channel, and further improving the discharge effect of the discharge device on the high-temperature and high-pressure combustible gas.
[0056] In the embodiment, the branch pipe 41 is obliquely arranged at the top of the row of battery cells 1, and the end of the branch pipe 41 communicating with the collecting pipe 42 is lower than the end of the branch pipe 41 away from the collecting pipe 42, so that the high-temperature and high-pressure combustible gas discharged to the branch pipe 41 through the plurality of drainage connection ports 411 flows faster in the direction of the collecting channel in the flow guide channel, thereby improving the discharge efficiency of the high-temperature and high-pressure combustible gas by the discharge device.
[0057] In addition, it is mentioned in the foregoing embodiments that part of the high-temperature and high-pressure combustible gas is condensed into liquid and deposited at the bottom of the flow guide channel when the high-temperature and high-pressure combustible gas flows along the flow guide channel. Therefore, in the present application, the branch pipe 41 is obliquely arranged, and the end of the branch pipe 41 communicating with the collecting pipe 42 is lower than the end of the branch pipe 41 away from the collecting pipe 42, so that the liquid flows along the flow guide channel to the collecting channel when part of the high-temperature and high-pressure combustible gas is condensed into liquid and deposited at the bottom of the flow guide channel, further preventing the high-temperature and high-pressure combustible gas from flowing back into the battery cell 1 after being liquefied, and ensuring the performance of the lithium ion battery.
[0058] The above-described content can be implemented alone or in various combinations, and these variants are within the protection scope of the present application.
[0059] It should be noted that, in the present text, relational terms such as first and second and the like are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.
[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery thermal runaway gas extraction device, characterized by: The device comprises a flow guide pipe (2) arranged on each battery cell (1), an explosion-proof valve (3) arranged at the bottom of each flow guide pipe (2), and a drainage pipe (4) in communication with the top of each flow guide pipe (2); the explosion-proof valve (3) is integrated with the flow guide pipe (2), the thermal runaway gas of the battery cell (1) enters the flow guide pipe (2) through the explosion-proof valve (3), and the drainage pipe (4) is used to guide the thermal runaway gas in the flow guide pipe (2) out.
2. A battery thermal runaway gas extraction device as defined in claim 1, characterized in that: The explosion-proof valve (3) comprises an explosion-proof sheet (31) arranged at the bottom of the flow guide pipe (2) and a score (32) arranged on the inner side of the explosion-proof sheet (31), and the top of the battery cell (1) is provided with an inlaid groove (11), and the explosion-proof sheet (31) is fixedly installed in the inlaid groove (11).
3. A battery thermal runaway gas extraction device as defined in claim 1, characterized in that: The drainage pipe (4) comprises a plurality of branch pipes (41) extending along the Y-axis direction and a collecting pipe (42) extending along the X-axis direction, the plurality of branch pipes (41) are arranged at intervals, and each branch pipe (41) is in communication with the top of a plurality of flow guide pipes (2) on a row of battery cells (1), and the collecting pipe (42) is in communication with one end of a plurality of branch pipes (41).
4. A battery thermal runaway gas extraction device as claimed in claim 3, wherein: The branch pipe (41) is provided with a flow guide channel, one end of the flow guide channel penetrates the branch pipe (41), the collecting pipe (42) is provided with a flow collecting channel, and the flow collecting channel is in communication with one end of a plurality of flow guide channels penetrating the branch pipe (41).
5. A battery thermal runaway gas extraction device as claimed in claim 4, wherein: A plurality of flow guide connecting ports (411) are arranged on the branch pipe (41) in the axial direction, and the top of a plurality of flow guide pipes (2) on a row of battery cells (1) is respectively inserted into the bottom of a plurality of flow guide connecting ports (411), and the flow guide channel is in communication with the top of a plurality of flow guide connecting ports (411).
6. A battery thermal runaway gas extraction device as claimed in claim 5, wherein: The top of the flow guide connecting port (411) is higher than the bottom of the flow guide channel.
7. A battery thermal runaway gas extraction device as defined in claim 5, characterized in that: A sealing ring (4111) is arranged in the flow guide connecting port (411), a sealing groove (21) is arranged on the outer periphery of the flow guide pipe (2), and when the top of the flow guide pipe (2) is inserted into the flow guide connecting port (411), the sealing ring (4111) is inlaid in the sealing groove (21).
8. A battery thermal runaway gas extraction device as defined in claim 5, characterized in that: A plurality of check valves are arranged in the branch pipe (41), and the plurality of check valves are respectively arranged at the front ends of the plurality of flow guide connecting ports (411).
9. A battery thermal runaway gas extraction device as defined in claim 3, characterized in that: The branch pipe (41) is arranged obliquely at the top of a row of battery cells (1), and one end of the branch pipe (41) in communication with the collecting pipe (42) is lower than the other end of the branch pipe (41) away from the collecting pipe (42).
10. A battery pack, characterized by, The device comprises a battery box (5) and a plurality of battery cells (1) arranged in the battery box (5), the plurality of battery cells (1) are arranged in an array in the battery box (5), one end of the drainage pipe (4) is in communication with the top of the flow guide pipe (2), and the other end of the drainage pipe (4) extends out of the battery box (5).