A lithium battery thermal runaway detection device

Abstract

The application discloses a lithium battery thermal runaway detection device, and relates to the field of battery thermal runaway detection.The lithium battery thermal runaway detection device comprises a battery body and a shell, and a gap for gas flow is arranged between the battery body and the shell.A first shunt is arranged in the shell, the first shunt can move into or out of the gap, and when the first shunt moves into the gap, the gap is divided into a plurality of first channels in a first direction.At least one detection device is arranged on one side of the shell, which is used for detecting thermal runaway data of the gap or the first channels.The first shunt is connected with a first driving mechanism used for driving the movement of the first shunt.The lithium battery thermal runaway detection device can constrain the escaped gas in the first channel to which the gas belongs in the early stage of thermal runaway, reduce the diffusion space of the gas, reduce the degree of gas concentration reduction, and enable the detection device to timely detect the gas data information in the early stage of thermal runaway.

Description

TECHNICAL FIELD

[0001] The present application relates to lithium battery thermal runaway detection technology, in particular to a lithium battery thermal runaway detection device. BACKGROUND

[0002] When the battery occurs thermal runaway, the temperature will rise, gas will escape and other phenomena, in order to improve safety, avoid a series of problems caused by thermal runaway, usually set up external detection device to monitor the thermal runaway of battery pack, the main means is to detect temperature, gas composition, etc., although the temperature monitoring can accurately judge thermal runaway, but when thermal runaway occurs, the early stage is generally gas escape, and then the temperature rises, at this time, the early stage has been to the middle stage of thermal runaway, although the detection device can also monitor the gas through detection, but due to the early stage of gas dispersion is small, when the local position of the battery pack occurs thermal runaway, the dispersed gas diffuses in the space of the battery pack or the space where the battery pack is located, so that the detectable gas concentration is reduced, affecting the timely detection of the detection device, and has certain hysteresis, and it is difficult to detect in the early stage of thermal runaway. SUMMARY

[0003] The purpose of the present application is to provide a lithium battery thermal runaway detection device to solve the above problems in the prior art.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme: a lithium battery thermal runaway detection device, comprising a battery body and a shell, the battery body and the shell have a gap for gas flow, a first flow divider is arranged in the shell, the first flow divider can move into or out of the gap, and when the first flow divider moves into the gap, the gap is divided into a plurality of first channels in the first direction, at least one detection device is arranged on one side of the shell for detecting thermal runaway data of the gap or the first channel, and the first flow divider is connected with a first driving mechanism for driving the movement thereof.

[0005] Further, a second flow divider is arranged in the shell, the second flow divider can move into or out of the gap, and when the second flow divider moves into the gap, the gap is divided into a plurality of second channels in the second direction.

[0006] Further, the detection device is arranged on one side of each first channel and each second channel.

[0007] Further, one detection device is arranged on one side of each first channel and each second channel.

[0008] Further, the detection device is connected with each first channel and / or each second channel in turn through an alternating communication device.

[0009] Further, the alternating communication device comprises a box body, a cavity for accommodating the detection device is formed in the box body, a guide channel for communicating with the cavity and each first channel is formed in the box body, and a switch component for closing or opening the guide channel is arranged in the box body.

[0010] Further, the cavity is circular, the outlet of the guide channel is located at the circumferential side of the cavity, the switch component comprises an arc-shaped door plate abutting against the circumferential side of the cavity and capable of rotating around the axis of the cavity, the arc-shaped door plate closes the guide channel when the arc-shaped door plate is moved to the outlet position of the guide channel, and the arc-shaped door plate is connected with a rotating member for driving the rotation of the arc-shaped door plate.

[0011] Further, the rotating member comprises a rotating ring arranged in the cavity and rotationally connected with the inner wall of the box body, a tooth portion is formed in the inner side of the rotating ring, the tooth portion is meshingly connected with a first gear, the first gear is rotationally connected with the box body, and one side of the first gear is fixedly connected with one end of the output shaft of the motor.

[0012] Further, the second shunt member is connected with a second driving mechanism for driving the movement of the second shunt member.

[0013] A lithium battery thermal runaway detection method is suitable for the lithium battery thermal runaway detection device, and specifically comprises the following steps.

[0014] S101, the first shunt member is moved to form a first channel, each first channel is detected, and detection data corresponding to each first channel is obtained.

[0015] S102, the second shunt member is moved to form a second channel, each second channel is detected, and detection data corresponding to each second channel is obtained.

[0016] S103, the thermal runaway area is located.

[0017] Compared with the prior art, the lithium battery thermal runaway detection device provided by the application has the following beneficial effects:

[0018] The lithium battery thermal runaway detection device provided by the application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0020] Figure 1 Partial sectional view of the detection device provided by the embodiment of the present application installed on the shell;

[0021] Figure 2 Partial sectional view of the detection device provided by the embodiment of the present application installed on the shell; Figure 1

[0022] Figure 3 Figure 2

[0023] Figure 4 Figure 1

[0024] Figure 5 Partial sectional view of the shell provided by the embodiment of the present application;

[0025] Figure 6 Partial sectional view of the shell provided by the embodiment of the present application; Figure 5

[0026] Figure 7

[0027] Figure 8

[0028] Figure 9

[0029] BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 1, battery body; 2, shell; 3, gap; 4, first shunt; 41, first channel; 42, first partition; 43, first driving member; 431, threaded rod; 432, threaded sleeve; 433, push-pull rod; 5, second shunt; 51, second partition; 52, second driving member; 521, bevel gear assembly; 522, sliding cylinder; 523, moving seat; 6, detection device; 7, alternate communication device; 71, box body; 72, cavity; 73, flow guide channel; 74, switch component; 741, arc-shaped door plate; 742, rotating ring; 743, tooth part; 744, first gear; 745, motor; 8, avoiding groove. DETAILED DESCRIPTION

[0031] ​​​​​​​​​In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0032] Embodiments, please refer to Figure 1 - Figure 8 A lithium battery thermal runaway detection device, comprising a battery body 1 and a shell 2, the battery body 1 and the shell 2 have a gap 3 for gas flow, a first shunt 4 is arranged in the shell 2, the first shunt 4 can move into or out of the gap 3, and the first shunt 4 separates the gap 3 into a plurality of first channels 41 in a first direction when it moves into the gap 3, at least one detection device 6 is arranged on one side of the shell 2 for detecting thermal runaway data of the gap 3 or the first channel 41, and the first shunt 4 is connected to a first driving mechanism for driving its movement.

[0033] In an embodiment of the present application, the first shunt 4 is composed of a plurality of first partitions 42 arranged in parallel, the length direction of the first partition 42 is perpendicular to the first direction, it should be understood that the first direction is the length direction or the width direction of the shell 2, here the width direction of the shell 2 is taken as an example, after the first shunt 4 moves to the gap 3, the gap 3 is divided into a plurality of parallel first channels 41; Figure 1

[0034] It should be noted that after the first shunt 4 moves to the gap 3, the first channel 41 is composed of the side of the battery body 1 and the inner side of the shell 2, the outlet of the first channel 41 communicates with the detection device 6, and the gas generated during thermal runaway will enter the detection device 6 along the first channel 41 for detection;

[0035] The formation of the first channel 41 separates the gap 3 between the battery body 1 and the shell 2, when the first channel 41 detects corresponding data, it represents that the corresponding event occurs in the first channel 41, such as detecting the gas composition in the early stage of thermal runaway, which indicates that the battery body 1 has a thermal runaway phenomenon at the first channel 41, at this time, the inhibitor can be delivered to the first channel 41 for inhibition, specifically, the shell 2 is connected with a fire extinguishing device (not shown in the figure), which provides an example of a fire extinguishing device, which includes a spray head, a partition control valve and a pipeline, the pipeline is connected to an automatic fire extinguishing device, such as perfluorohexanone fire extinguishing device, etc., the implementation mode is prior art, which will not be described in detail here;

[0036] By arranging the first shunt 4, the escaped gas is restrained in the first channel 41 to which it belongs in the early stage of battery thermal runaway, the diffusion space is reduced, the degree of gas concentration reduction is reduced, the detection device 6 can detect the data information of the gas in time, and the formation of the first channel 41 also obtains the relative position of the battery with thermal runaway, which is conducive to positioning the inhibitor to the thermal runaway area more accurately when delivering the inhibitor;​

[0037] In one embodiment of the present application, generally, each first channel 41 can correspond to a detection device 6 for detecting the data information of each first channel 41 respectively, but the volume of the battery pack formed by the combination of multiple battery bodies 1 is limited, and the arrangement of multiple detection devices 6 will occupy more space, so a detection mode of using fewer detection devices 6 to detect multiple first channels 41 is designed, that is, one detection device 6 can correspond to multiple first channels 41.

[0038] Specifically, an alternating communication device 7 is arranged on one side of the first channel 41 for sequentially communicating with each first channel 41, the alternating communication device 7 includes a box body 71 fixedly connected to one side of the shell 2, a cavity 72 for accommodating the detection device 6 is formed in the box body 71, and a flow guide channel 73 for communicating the cavity 72 and each first channel 41 respectively is formed in the box body 71, and a switch component 74 for closing or opening the flow guide channel 73 is arranged in the box body 71.

[0039] In one embodiment of the present application, a specific example of the switch component 74 is provided, which is generally a plate-shaped valve arranged in each flow guide channel 73 independently, and the closing or opening is realized by moving the plate-shaped valve into or out of the flow guide channel 73, and the moving mode of the plate-shaped valve includes cylinder pushing or electric telescopic rod pushing, and the above modes are prior art, so they are not described in detail in this technical solution, and are not drawn in the drawings, and based on the fact that they will not cause trouble in the field, the different first channels 41 are communicated with the detection device 6 for detection by controlling the opening or closing of the flow guide channel 73.

[0040] It should be understood that in the mode of using one detection device 6 to detect multiple first channels 41, the switch component 74 for switching different first channels 41 to the detection device 6 has a certain switching frequency, and generally, it sequentially communicates each first channel 41 at a certain time interval.

[0041] In one embodiment of the present application, another specific example of the switch component 74 is provided, which has the advantages of convenient switching mode and less structure compared with the above plate-shaped valve mode.

[0042] As shown in Figure 2 and Figure 3 , specifically:

[0043] The cavity 72 is circular, the outlet of the flow guide channel 73 is located at the side of the cavity 72, the switch component 74 comprises an arc-shaped door plate 741 abutting at the side of the cavity 72 and capable of rotating around the axis of the cavity 72, the arc-shaped door plate 741 is moved to the outlet position of the flow guide channel 73 to close the flow guide channel 73, and the arc-shaped door plate 741 is connected with a rotating member for driving the rotation thereof;

[0044] In an embodiment of the present application, the rotating member comprises a rotating ring 742 located in the cavity 72 and rotationally connected with the inner wall of the box body 71, a tooth portion 743 is formed in the inner side of the rotating ring 742, the tooth portion 743 is meshingly connected with a first gear 744, the first gear 744 is rotationally connected with the box body 71, and one side of the first gear 744 is fixedly connected with one end of the output shaft of a motor 745, the first gear 744 is driven to rotate by the motor 745 to drive the rotating ring 742 to rotate, one side of the rotating ring 742 is connected with the arc-shaped door plate 741, so that the arc-shaped door plate 741 is driven to rotate and can be rotated to the outlet of each flow guide channel 73.

[0045] In an embodiment of the present application, a specific example of the first driving member 43 is provided, the first driving member 43 comprises a plurality of cylinders, the cylinder body of the cylinder is fixedly installed on one side of the shell 2, and the piston rod of the cylinder is connected with one end of the first partition plate 42, and it should be understood that the cylinders are arranged at both ends of the same first partition plate 42, and each cylinder is synchronously extended and retracted to drive each first partition plate 42 to move.

[0046] In an embodiment of the present application, another specific example of the first driving member 43 is provided, which comprises two threaded rods 431 located at both ends of the first partition plate 42 and rotationally connected with the inner wall of the shell 2, a threaded sleeve 432 corresponding in number to the first partition plate 42 is threadedly connected with the threaded rod 431, a push-pull rod 433 is rotationally connected with the side wall of the threaded sleeve 432, and the other end of the push-pull rod 433 is rotationally connected with one end of the first partition plate 42, and it should be noted that when the threaded sleeve 432 is moved to the end of the stroke away from the corresponding first partition plate 42, the push-pull rod 433 is inclined, that is, has a certain angle, so that when the threaded sleeve 432 is close to the first partition plate 42, the first partition plate 42 can be pushed to move, and the two threaded rods 431 are synchronously rotated, which can be achieved by synchronous belt transmission or by connecting a stepping motor with each end of the two threaded rods 431 to drive the two threaded rods 431 to synchronously rotate;

[0047] In one embodiment of the present application, a second flow divider 5 can also be provided, which can be moved into or out of the gap 3, and when the second flow divider 5 is moved into the gap 3, the gap 3 is divided into a plurality of second channels in a second direction; wherein the second direction is perpendicular to the first direction, that is, the second direction is the length direction of the shell 2 at this time, and the second flow divider 5 is also composed of a plurality of second partitions 51 arranged in parallel; after the second flow divider 5 is moved into the gap 3, the gap 3 is divided into a plurality of parallel second channels;

[0048] In one embodiment of the present application, the same arrangement is provided, and each second channel is also provided with a detection device 6, which can be provided with one detection device 6 on one side of each second channel or one detection device 6 on one side of each second channel, in the same way as the detection device 6 provided at the first channel 41 described above, which will not be described in detail here;

[0049] In one embodiment of the present application, only one detection device 6 can be provided for each first channel 41 and second channel, specifically, the arrangement of each first channel 41 remains unchanged, that is, each first channel 41 is connected to the cavity 72 through the flow guide channel 73, and each second channel needs to be connected to the cavity 72 through an extended flow guide channel 73, that is, the box body 71 of the alternate connection device 7 also needs to extend to the other side of the shell 2, so as to be connected to the outlet of each second channel, which is not shown in the figure, at this time, the cavity 72 is used to detect the corresponding data of each first channel 41 and second channel at the same time, it should be noted that the provision of only one detection device 6 will cause the time interval of one cycle of detection to be lengthened due to the increase in the number of first channels 41 and second channels, which will affect the timeliness of detection, therefore, this method is suitable for the case where the number of first channels 41 and second channels is small, or in other words, it is suitable for the case where the number of battery monomers in the battery pack is small, it should be understood that the battery monomer can be a plurality of batteries forming a battery pack, when the number of first channels 41 and second channels required is large, a detection device 6 can be provided for a small number of first channels 41 or second channels, so as to complete one cycle of detection within a certain time interval;

[0050] By dividing the gap 3 in the second direction through the provision of the second channel, the detection device 6 can further locate the position of thermal runaway, specifically, taking the detection of the escaping gas as an example, when thermal runaway occurs at a certain first channel 41 is detected, the first flow divider 4 is moved out of the gap 3, and the second flow divider 5 is moved into the gap 3 to form each second channel, by detecting the gas escaping condition of the second channel, the position of the second channel where the thermal runaway position is located is obtained, and by comparing the positions of the first channel 41 and the second channel, the relative position of the thermal runaway can be obtained, such as Figure 9As shown, X represents the first channel 41, and Y represents the second channel, which shows an example of positioning the thermal runaway position by detecting the first channel 41 and the second channel once when thermal runaway occurs (the position shown by X in the figure), and it should be noted that even if multiple thermal runaways occur, this method can still accurately locate the thermal runaway position.

[0051] In an embodiment of the present application, an example of a second driving member 52 is provided, which is driven by a plurality of air cylinders in the same way as the first driving member 43, which will not be described in detail here.

[0052] In an embodiment of the present application, another second driving member 52 is provided, which also drives the second flow divider 5 by driving the threaded rod 431, which will not be described in detail here.

[0053] In an embodiment of the present application, a linkage mode of the first driving member 43 and the second driving member 52 is also provided, as shown in Figure 5 and Figure 6 The threaded rod 431 of the first driving member 43 and the threaded rod 431 of the second driving member 52 are connected by a bevel gear assembly 521, specifically, the threaded rod 431 of the first driving member 43 and the threaded rod 431 of the second driving member 52 are both fixedly connected with bevel gears at one end, and the bevel gears at the ends of the adjacent two threaded rods 431 are meshed.

[0054] It should be noted that only by providing the threaded sleeve 432 and the push-pull rod 433, when the first driving member 43 and the second driving member 52 are linked, the first flow divider 4 or the second flow divider 5 needs to be initially located in the gap 3, and when detecting, the first flow divider 4 and the second flow divider 5 are alternately moved into or out of the gap 3, that is, during the detection process before and after the detection device 6, the first flow divider 4 or the second flow divider 5 is always present in the gap 3, although the thickness of the first partition plate 42 and the second partition plate 51 can be set to be thin enough to not affect the normal use of the battery pack and the detection device 6, but for some gaps 3 with certain use requirements (such as heat dissipation, input of inhibitors during thermal runaway, etc.), the first flow divider 4 and the second flow divider 5 need to be moved out of the gap 3 before and after detection, therefore, on the basis of the above, a further embodiment is further provided, specifically, a delay member is installed on the threaded rod 431 of the first driving member 43 or the second driving member 52, which includes a sliding cylinder 522, the inner wall of the sliding cylinder 522 is threadedly connected with the surface of the threaded rod 431, and a moving seat 523 is slidingly connected with the surface of the sliding sleeve, the moving seat 523 is rotatably connected with the end of the push-pull rod 433, in this way, the rotation of the threaded rod 431 will first push the sliding cylinder 522 to rotate, and when one end of the sliding cylinder 522 abuts against the end of the moving seat 523, the moving seat 523 will be further pushed to move, thereby driving the corresponding first flow divider 4 or second flow divider 5 to move, Figure 8The sliding cylinder 522 is mounted on the threaded rod 431 of the second driving member 52 by way of example; it should be understood that for four threaded rods 431, one of the adjacent positions does not need to be mounted with the bevel gear assembly 521 for transmission;

[0055] In addition, referring to Figure 7 , which represents the state that the first driving member 43 and the second driving member 52 drive the first shunt 4 and the second shunt 5 to move into or out of the gap 3 at the same time.

[0056] In an embodiment of the present application, the first partition plate 42 and the second partition plate 51 are located at the gap between the battery monomers when moving out of the gap 3, and the first partition plate 42 and the second partition plate 51 are both provided with an avoiding groove 8 for avoiding each other when moving.

[0057] In an embodiment of the present application, a positioning detection method for a thermal runaway position of a lithium battery is provided, which specifically comprises the following steps:

[0058] S101, moving the first shunt 4 to form a first channel 41, detecting each first channel 41, and obtaining detection data corresponding to each first channel 41;

[0059] S102, moving the second shunt 5 to form a second channel, detecting each second channel, and obtaining detection data corresponding to each second channel;

[0060] S103, positioning the thermal runaway area;

[0061] It should be understood that when multiple thermal runaway positions occur, multiple positions can also be positioned;

[0062] It should be further pointed out that the setting of the detection device in the present scheme and the detection method can not only be directly applied to actual products, but also be used for experiments and tests of battery packs.

[0063] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the present application.

Claims

1. A lithium battery thermal runaway detection device comprising a battery body and a housing, characterized in that: The battery body and the shell have a gap for gas flow, the shell is provided with a first flow divider capable of moving into or out of the gap, and the first flow divider divides the gap into a plurality of first channels in a first direction when moving into the gap, the shell is provided with at least one detection device on one side for detecting thermal runaway data of the gap or the first channels, and the first flow divider is connected to a first driving member for driving the movement thereof; The shell is further provided with a second flow divider capable of moving into or out of the gap, and the second flow divider divides the gap into a plurality of second channels in a second direction when moving into the gap, and the second flow divider is connected to a second driving member for driving the movement thereof; The first driving member and the second driving member each include two threaded rods, a plurality of threaded sleeves are threadedly connected to the threaded rods, a push-pull rod is rotatably connected to the side wall of the threaded sleeve, a bevel gear is fixedly connected to one end of each of the threaded rods of the first driving member and the second driving member, and the bevel gears at the end portions of the adjacent two threaded rods are meshed; a delay member is mounted on the threaded rod of the first driving member or the second driving member, the delay member includes a sliding cylinder, the inner wall of the sliding cylinder is threadedly connected to the surface of the threaded rod, a moving seat is slidably connected to the surface of the sliding sleeve, and the moving seat is rotatably connected to the end portion of the push-pull rod.

2. The lithium battery thermal runaway detection device of claim 1, wherein, The detection devices are respectively arranged on one side of each first channel and each second channel.

3. The lithium battery thermal runaway detection device of claim 1, wherein, One detection device is respectively arranged on one side of each first channel and each second channel.

4. The lithium battery thermal runaway detection device of claim 3, wherein, The detection devices are sequentially communicated with each first channel and / or each second channel through an alternate communication device.

5. The lithium battery thermal runaway detection device of claim 4, wherein, The alternate communication device includes a box body, a cavity for accommodating the detection devices is formed in the box body, and a flow guide channel is formed in the box body and communicates with the cavity and each first channel, and a switch component is arranged in the box body for closing or opening the flow guide channel.

6. The lithium battery thermal runaway detection device of claim 5, wherein, The cavity is circular, the outlet of the flow guide channel is located on the circumferential side of the cavity, the switch component includes an arc-shaped door plate abutting against the circumferential side of the cavity and capable of rotating around the axis of the cavity, the arc-shaped door plate closes the flow guide channel when moving to the outlet position of the flow guide channel, and the arc-shaped door plate is connected to a rotating member for driving the rotation thereof.

7. The lithium battery thermal runaway detection device of claim 6, wherein, The rotating member includes a rotating ring rotatably connected to the inner wall of the cavity in the box body, a tooth portion is formed in the inner side of the rotating ring, the tooth portion is meshingly connected to a first gear, the first gear is rotatably connected to the box body, and one end of the output shaft of an electric motor is fixedly connected to one side of the first gear.

8. A method for detecting thermal runaway of a lithium battery, suitable for use in a device for detecting thermal runaway of a lithium battery according to any one of claims 1 to 7, characterized in that, Specifically includes the following steps: S101, moving the first flow divider to form first channels, detecting each first channel to obtain detection data corresponding to each first channel; S102, moving the second flow divider to form second channels, detecting each second channel to obtain detection data corresponding to each second channel; S103, positioning the thermal runaway area.

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