Battery needling device

Abstract

The utility model relates to the technical field of battery testing devices, and discloses a battery needling device. The battery needling device comprises a box body, a needling assembly, a temperature acquisition unit, an air outlet pipeline and a controller. The temperature acquisition unit is arranged in the box body, so that the temperature of the battery can be acquired in real time while the acupuncture experiment is performed, the thermal runaway stage of the battery can be judged according to the temperature change, the air outlet pipeline comprises a plurality of air outlet branches, and one of the air outlet branches can be selected to be communicated with the air outlet channel of the box body, so that the thermal runaway stage of the battery can be judged. And different gas outlet branches can be selected to be communicated with the gas outlet channel according to different thermal runaway stages of the battery, so that gas produced in the different thermal runaway stages of the battery can be respectively led out of the box body to be collected, and further analysis and verification can be conveniently carried out on the gas produced in the different thermal runaway stages of the battery. And the whole process is controlled by the controller, the automation degree is high, and the safety is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery testing device technical field, concretely relates to battery needle pricking device. BACKGROUND

[0002] With more and more application of battery to life and production, the safety problem of battery is gradually paid close attention to. Needle pricking experiment is a kind of internal short circuit test method of battery, and its purpose is to test the internal short circuit bearing capacity of battery, and it is one of the most representative safety tests. Nowadays, battery needle pricking test is generally evaluated by whether battery smokes, ignites and other experimental phenomena, and only the voltage change curve and temperature change of battery can be used for auxiliary analysis in the experimental process, and the gas production of different stages of battery thermal runaway cannot be collected, so as to provide the thought direction for subsequent battery improvement. UTILITY MODEL CONTENTS

[0003] Therefore, the utility model provides a kind of battery needle pricking device to solve the problem that battery needle pricking device cannot collect the gas production of different stages of battery thermal runaway.

[0004] The utility model provides a kind of battery needle pricking device, comprising: box, inside having support platform, the support platform is suitable for placing battery, the box is opened and has the gas outlet passage of the through box inside and outside;Needle pricking component is set in the box interior, and the needle pricking component includes needle, and the needle can selectively approach or be far from the support platform;Temperature acquisition unit is set in the interior of the box, and the temperature acquisition unit is suitable for collecting the temperature of the battery;Gas pipeline is set in the exterior of the box and is connected in the gas outlet end of the gas outlet passage, and the gas pipeline has the on state of being communicated with the gas outlet passage and the off state of being cut off with the gas outlet passage, and the gas pipeline includes multiple gas branches, and when the gas pipeline is in the on state, one of multiple gas branches is communicated with the gas outlet passage;Controller is electrically connected with the temperature acquisition unit, and the controller is suitable for controlling the on-off of the gas branch according to the temperature signal collected by the temperature acquisition unit.

[0005] Beneficial effect: by setting temperature acquisition unit in the box, the temperature of battery can be collected in real time while carrying out needle pricking experiment, and the thermal runaway stage of battery can be judged according to the change of temperature, and by setting gas pipeline including multiple gas branches and multiple gas branches can be selectively communicated with the gas outlet passage of the box, different gas branches can be selected to be communicated with the gas outlet passage according to the thermal runaway stage of battery, so that the gas production of different stages of battery thermal runaway can be respectively led out to the box outside for collection, so as to further analyze and verify the gas production of different stages of battery thermal runaway, and the whole process is controlled by controller, and the degree of automation is high, and safety is good.

[0006] In an alternative embodiment, the battery needle puncture device further comprises a valve body arranged between the gas outlet branch and the gas outlet channel, and the valve body is electrically connected with the controller.

[0007] Beneficial effects: By arranging the valve body between the gas outlet branch and the gas outlet channel, the opening and closing of the gas outlet branch can be controlled through the valve body, which is convenient to operate and has high reliability. The controller is suitable for controlling the opening and closing of the valve body according to the temperature signal collected by the temperature collection unit, and the degree of automation is high.

[0008] In an alternative embodiment, the valve body has one inlet and multiple outlets, the inlet of the valve body is in communication with the gas outlet end of the gas outlet channel, the number of the outlets of the valve body is equal to and corresponds to the number of the gas outlet branches, and the valve body has a closed state in which all the outlets are cut off from the inlet, and an open state in which multiple outlets are selectively in communication with the inlet.

[0009] Beneficial effects: By arranging the valve body to have one inlet and multiple outlets equal to the number of the gas outlet branches, the valve body is an integrated valve, and the gas outlet channel and the multiple gas outlet branches are connected through one valve body, which has a simple structure. The multiple outlets of the valve body can be selectively opened or closed, thereby realizing the control of the opening and closing of each gas outlet branch. The opening and closing of the multiple gas outlet branches are controlled by the valve body 5, which is convenient to operate. The connection line between one valve body and the controller is simple, which is convenient to arrange.

[0010] In an alternative embodiment, the gas outlet pipeline comprises three gas outlet branches, the valve body has one inlet and three outlets, and each outlet is connected with one gas outlet branch.

[0011] Beneficial effects: By arranging the gas outlet pipeline to comprise three gas outlet branches and the valve body to have one inlet and three outlets, the valve body can control the three gas outlet branches to be sequentially and individually in communication, thereby realizing the discharge of the gas generated in the three stages of starting thermal runaway, complete thermal runaway, and post-thermal runaway of the battery thermal runaway through different gas outlet branches, and further realizing the separate collection of the gas generated in different stages of the battery thermal runaway.

[0012] In an alternative embodiment, the puncture needle is a hollow structure, the inner cavity of the puncture needle forms a gas guide channel, the gas inlet of the gas guide channel is in communication with the inside of the box body, and the gas outlet of the gas guide channel is in communication with the gas outlet channel.

[0013] Beneficial effects: By setting the air guide channel inside the needle, the air inlet of the air guide channel is located inside the box, and the air outlet is communicated with the air outlet channel. The gas in the box can be guided out of the box through the air guide channel in the needle. The structure is simple, and the air inlet of the air guide channel can move up and down with the needle. It is convenient to collect the gas at different height positions in the box. Therefore, after the battery test is completed, the harmful gas generated by the battery thermal runaway can be quickly collected, so as to facilitate the development of the next test, and the time of repeated test is greatly reduced.

[0014] In an alternative embodiment, the battery needle puncture device further comprises: a pressing assembly connected to the box and movable relative to the support platform to fix the battery on the support platform.

[0015] Beneficial effects: By setting the pressing assembly movable relative to the support platform, the relative position between the pressing assembly and the battery on the support platform can be adjusted, so that the pressing assembly can accurately press the battery to fix the battery and prevent the battery from shifting during the needle puncture process, thereby improving the accuracy of the test results.

[0016] In an alternative embodiment, the pressing assembly comprises two oppositely arranged mechanical arms connected to the side wall of the box, and the mechanical arms have pressing parts at the ends away from the box, which are adapted to press the battery.

[0017] Beneficial effects: By setting the number of mechanical arms to two, the pressing parts on the two spaced apart mechanical arms jointly press the battery, which can further improve the fixing effect of the pressing assembly on the battery and ensure the stability of the battery position during the needle puncture test. The mechanical arm has high flexibility and is easy to operate.

[0018] In an alternative embodiment, the battery needle puncture device further comprises: an insulating plate fixedly connected to the side of the pressing part facing the battery.

[0019] Beneficial effects: By externally arranging the insulating plate on the side of the mechanical arm contacting the battery, the heat generated by the battery thermal runaway can be prevented from being conducted to the test environment through the mechanical arm, thereby improving the accuracy of the battery temperature detected by the temperature acquisition unit, and further ensuring the accuracy of the gas collected at different stages of battery thermal runaway according to the temperature change.

[0020] In an alternative embodiment, the temperature acquisition unit comprises a main body and a probe, the main body is arranged inside the mechanical arm, and the probe penetrates through the insulating plate and is adapted to contact the battery.

[0021] Beneficial effect: by setting the temperature acquisition unit in the main body part built-in and the mechanical arm and the probe passes through the heat insulation plate, the temperature acquisition unit moves with the mechanical arm, so that the mechanical arm can realize real-time detection of the battery surface temperature while fixing the battery, and if the probe fails after the battery thermal runaway, only the front end of the probe protruding from the heat insulation plate is cut off, and the test can be restarted, which is simple to replace, greatly reduces the time of repeated experiments, and improves the experimental efficiency.

[0022] In an alternative embodiment, the battery needle puncture device further comprises a pressure sensor arranged on the mechanical arm to detect the force applied by the mechanical arm to the battery.

[0023] Beneficial effect: by setting the pressure sensor on the mechanical arm, the pressure applied by the mechanical arm to the battery can be detected in real time, so as to ensure that the mechanical arm applies appropriate pressure to the battery, on the one hand to fix the battery on the support platform, and on the other hand to avoid excessive pressure and bruise the battery, thereby improving the reliability of the test results. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 It is a structural schematic diagram of a battery needle puncture device according to an embodiment of the present application.

[0026] Figure 2 It is Figure 1 It is a bottom view of the compression assembly in the battery needle puncture device shown in the figure.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1, box; 101, support platform; 102, gas outlet passage; 103, upper cavity; 2, needle; 201, gas guide passage; 3, temperature acquisition unit; 301, main body part; 302, probe; 4, gas outlet pipeline; 401, first gas outlet branch; 402, second gas outlet branch; 403, third gas outlet branch; 5, valve body; 6, compression assembly; 601, mechanical arm; 602, compression part; 7, heat insulation plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] The needle puncture experiment is a kind of internal short circuit test method of battery, and is one of the most representative and most difficult safety tests. Nowadays, the battery needle puncture test of lithium battery is generally evaluated by whether the battery smokes, ignites and other experimental phenomena to evaluate the safety of battery performance. In the experimental process, only the voltage change curve and temperature change of the battery can be used for auxiliary analysis. However, the battery thermal runaway process experiences three stages in turn, namely, starting thermal runaway, complete thermal runaway and thermal runaway after thermal runaway. The gas components generated in different stages of battery thermal runaway are different. If the gas generated in different stages can be collected and analyzed, it has certain guiding significance for the subsequent improvement of the battery. However, the battery needle puncture device in the prior art cannot collect the gas generated in different stages of battery thermal runaway, so it cannot provide ideas for the subsequent improvement of the battery. In addition, once the battery occurs thermal runaway phenomenon during the needle puncture experiment, toxic gas and smoke will be released during the combustion process, and the fixture and other equipment will be damaged, so it is difficult to repeat the test in a short time.

[0031] The embodiments of the utility model will be described below in combination with Figures 1 to 2 .

[0032] According to the embodiment of the utility model, provide a kind of battery needle device, it include: box 1, needle component, temperature acquisition unit 3, gas outlet pipeline 4 and controller.Box 1 inside has support platform 101, support platform 101 is suitable for placing battery, box 1 is equipped with the gas outlet passage 102 that passes through the inside and outside of box 1;Needle component is arranged in the inside of box 1, and needle component includes needle 2, needle 2 selectively approaches or is far from support platform 101;Temperature acquisition unit 3 is arranged in the inside of box 1, and temperature acquisition unit 3 is suitable for collecting the temperature of battery;Gas outlet pipeline 4 is arranged in the outside of box 1 and is connected in the gas outlet end of gas outlet passage 102, and gas outlet pipeline 4 has the on state that is communicated with gas outlet passage 102 and the off state that is cut off with gas outlet passage 102, and gas outlet pipeline 4 includes multiple gas outlet branches, when gas outlet pipeline 4 is in on state, one of multiple gas outlet branches is communicated with gas outlet passage 102;Controller is electrically connected with temperature acquisition unit 3, and controller is suitable for according to the temperature signal that temperature acquisition unit 3 is collected to control the on-off of gas outlet branch.Gas outlet passage 102 has gas inlet end and gas outlet end, and the gas inlet end of gas outlet passage 102 is opened towards the inside of box 1 and the gas outlet end is opened towards the outside of box 1.

[0033] The battery needle device of the embodiment can collect the temperature of the battery in real time while performing needle test by arranging the temperature acquisition unit 3 in the box 1, can judge the thermal runaway stage of the battery according to the change of the temperature, and can select different gas outlet branches to be communicated with the gas outlet passage 102 of the box 1 according to different thermal runaway stages of the battery, so as to realize that the gas generated in different stages of thermal runaway of the battery is discharged to the outside of the box 1 for collection, so as to further analyze and verify the gas generated in different stages of thermal runaway of the battery, and the whole process is controlled by the controller, with high automation degree and good safety.Gas outlet branch is connected with gas outlet passage 102 at one end and is connected with gas collection container such as gas collection tank at the other end, so as to realize the collection of gas.

[0034] It should be noted that the box body 1 has good sealing performance, at least one side wall of the box body is made of transparent material to facilitate observation of the battery state in the box body 1. During the needle puncture experiment, the battery to be tested is placed on the support platform 101, and the needle 2 in the needle puncture assembly moves towards the support platform 101 to puncture the battery and cause thermal runaway of the battery. The battery sequentially experiences three stages of starting thermal runaway, complete thermal runaway, and post-thermal runaway during thermal runaway. Correspondingly, the temperature of the battery presents three stages of temperature rise, temperature rising to the highest point, and temperature drop. Therefore, different gas outlet branches can be turned on at three time nodes of obvious temperature rise, temperature starting to decrease from the highest point, and temperature returning to below a preset temperature value (usually 100°C), so that the gas generated in different stages of battery thermal runaway can be guided out of the different gas collection containers, and the gas generated in different stages of battery thermal runaway can be collected separately. Preferably, the battery is a lithium battery.

[0035] Preferably, the gas outlet pipeline 4 includes three gas outlet branches, namely a first gas outlet branch 401, a second gas outlet branch 402, and a third gas outlet branch 403. Specifically, when the needle puncture experiment has not started or just started, the gas outlet pipeline 4 is in an off state, and the three gas outlet branches are not turned on. When the temperature collection unit 3 detects that the battery temperature rises obviously, the first gas outlet branch 401 is turned on, and the other gas outlet branches are closed, so that the gas generated in the starting thermal runaway stage of the battery is guided out of the box body 1 for collection. When the temperature collection unit 3 detects that the battery temperature starts to decrease from the highest point, the second gas outlet branch 402 is turned on, and the other gas outlet branches are closed, so that the gas generated in the complete thermal runaway stage of the battery is guided out of the box body 1 for collection. When the temperature collection unit 3 detects that the temperature returns to a preset temperature value (usually 100°C), the third gas outlet branch 403 is turned on, and the other gas outlet branches are closed, so that the gas generated in the post-thermal runaway stage of the battery is guided out of the box body 1 for collection, thereby realizing the collection of the gas generated in different stages of battery thermal runaway.

[0036] In one embodiment, the temperature collection unit 3 is a thermocouple, which has fast response speed, high precision, simple structure, and is easy to use. During the experiment, the temperature collection unit 3 is in contact with the outer surface of the battery to detect the temperature of the outer surface of the battery.

[0037] In one embodiment, the battery needle puncture device further includes a valve body 5 disposed between the gas outlet branch and the gas outlet channel 102, and the valve body 5 is electrically connected with the controller. By arranging the valve body 5 between the gas outlet branch and the gas outlet channel 102, the valve body 5 can be used to control the on-off of the gas outlet branch, which is convenient to operate and has high reliability. Moreover, the controller is adapted to control the opening and closing of the valve body 5 according to the temperature signal collected by the temperature collection unit 3, thereby achieving high automation.

[0038] In an embodiment, the valve body 5 is an integrated valve, the valve body 5 has one inlet and multiple outlets, the inlet of the valve body 5 is in communication with the gas outlet end of the gas outlet channel 102, the number of the outlets of the valve body 5 is equal to the number of the gas outlet branches and is in one-to-one correspondence connection, the valve body 5 has a closed state in which all the outlets are cut off from the inlet, and an open state in which multiple outlets are in communication with the inlet. Specifically, when the valve body 5 is in the closed state, the gas outlet channel 102 and the gas outlet pipeline 4 are in the off state, avoiding the gas in the box 1 from overflowing; when the valve body 5 is in the open state, multiple outlets of the valve body 5 are in communication with the inlet, then multiple gas outlet branches in the gas outlet pipeline 4 are in communication with the gas outlet channel 102, realizing the switching of the gas outlet pipeline 4 from the off state to the on state. By setting the valve body 5 to have one inlet and multiple outlets equal to the number of the gas outlet branches, the valve body 5 is an integrated valve, the gas outlet channel 102 and the multiple gas outlet branches are connected through one valve body 5, the structure is simple, multiple outlets of the valve body 5 can be selectively opened or closed, thereby realizing the control of the on-off of each gas outlet branch, the on-off of the multiple gas outlet branches is controlled by the valve body 5, which is convenient to operate, and the connection line between one valve body 5 and the controller is simple, which is convenient to arrange.

[0039] In an embodiment, the gas outlet pipeline 4 includes three gas outlet branches, the valve body 5 has one inlet and three outlets, and each outlet is connected with one gas outlet branch. Specifically, the first gas outlet branch 401, the second gas outlet branch 402 and the third gas outlet branch 403 are respectively connected with one outlet of the valve body 5, the valve body 5 is a four-way valve, the valve body 5 has a closed state and an open state, and when the valve body 5 is in the open state, the three outlets are in communication with the inlet. By setting the gas outlet pipeline 4 to include three gas outlet branches and the valve body 5 to have one inlet and three outlets, the valve body 5 can control the three gas outlet branches to be sequentially and individually in communication, thereby realizing the discharge of the gas generated in the three stages of the battery thermal runaway, i.e., the beginning of the thermal runaway, the complete thermal runaway and after the thermal runaway, through different gas outlet branches, and further realizing the separate collection of the gas generated in different stages of the battery thermal runaway.

[0040] In addition, in other embodiments, the valve body 5 can also be a split valve, including multiple valves, one valve is arranged on each gas outlet branch, and each valve controls the on-off of the corresponding gas outlet branch, and the switching of the gas outlet pipeline 4 between the on state in which multiple gas outlet branches are in communication and the off state in which all gas outlet branches are cut off can also be realized.

[0041] In one embodiment, the needle 2 has a hollow structure, and the inner cavity of the needle 2 forms a gas guiding channel 201. The air inlet of the gas guiding channel 201 is connected to the interior of the housing 1, and the air outlet of the gas guiding channel 201 is connected to the air outlet channel 102. Preferably, the air inlet of the gas guiding channel 201 is located at the tip of the needle 2, and the air outlet of the gas guiding channel 201 is located at the tail of the needle 2. By setting the gas guiding channel 201 inside the needle 2, with the air inlet of the gas guiding channel 201 located inside the housing 1 and the air outlet connected to the air outlet channel 102, the gas inside the housing 1 can be vented to the outside of the housing 1 through the gas guiding channel 201 inside the needle 2. The structure is simple, and the air inlet of the gas guiding channel 201 can move up and down with the needle 2, which is convenient for collecting gas at different heights inside the housing 1. Thus, after the battery test is completed, the harmful gases generated by the thermal runaway of the battery can be quickly collected to facilitate the next test and significantly reduce the time of repeated testing.

[0042] In one embodiment, a vacuum pump can also be installed on the gas outlet pipe 4. After the experiment is completed, the vacuum pump is started to help remove the remaining toxic gas in the chamber 1 and reduce the preparation time for the next test.

[0043] In one embodiment, an upper cavity 103 is provided at the top of the interior of the housing 1. The needle assembly includes a needle 2 and a driving part. The driving part is disposed inside the upper cavity 103, and the needle 2 extends downward out of the upper cavity 103. The driving part is adapted to drive the needle 2 to move up and down. The top of the housing 1 is provided with an air outlet communicating with the upper cavity 103. The gas inside the housing 1 is guided to the upper cavity 103 through the air guide channel 201 on the needle 2, and then discharged from the housing 1 through the air outlet on the housing 1. The air outlet on the housing 1 is connected to the upper cavity 103 through the air outlet channel 102, thereby realizing the discharge of gas from the housing 1 through the air outlet channel 102. Here, "moving up and down" refers to moving along... Figure 1 The middle arrow indicates movement in the "up and down" direction; the top arrow indicates movement along... Figure 1 The end in the direction indicated by the middle arrow. Preferably, the air outlet channel 102 is a pipe, which has a simple structure and good sealing performance.

[0044] In one embodiment, the battery puncture device further includes a clamping component 6, which is connected to the housing 1 and movable relative to the support platform 101 to fix the battery located on the support platform 101. At least a portion of the clamping component 6 is located inside the housing 1. The clamping component 6 is movable relative to the support platform 101 in both vertical and horizontal directions. By allowing the clamping component 6 to move relative to the support platform 101, the relative position between the clamping component 6 and the battery located on the support platform 101 can be adjusted, thereby ensuring that the clamping component 6 can accurately press down on the battery, thus fixing the battery and preventing battery displacement during puncture, thereby improving the accuracy of the test results. The vertical direction refers to...Figure 1 The direction in which the upper and lower arrows point; the horizontal direction is any direction in the plane perpendicular to the up-down direction.

[0045] In one embodiment, the pressing assembly 6 comprises two mechanical arms 601 arranged oppositely, the mechanical arms 601 are connected to the side walls of the box 1, and the ends of the mechanical arms 601 away from the box 1 are provided with pressing parts 602 adapted to press the battery. It should be noted that the box 1 is a square box, and one mechanical arm 601 is connected to each of the two opposite side walls of the box 1. By arranging two mechanical arms 601, the pressing parts 602 on the two mechanical arms 601 arranged at intervals can jointly press the battery, which can further improve the fixing effect of the pressing assembly 6 on the battery, ensure the stability of the battery position during the needle puncture experiment, and the mechanical arms 601 have high flexibility and are convenient to operate.

[0046] Alternatively, the mechanical arms 601 can be connected to the inner walls of the box 1 in a sliding manner, and the mechanical arms 601 are located inside the box 1, so as to realize the movement of the mechanical arms 601 relative to the support platform 101 in the up-down direction; at the same time, the mechanical arms 601 can also be telescopic in the horizontal direction, so as to adjust the position of the pressing part 602 according to different models of batteries, thereby realizing the fixation of the battery.

[0047] In one embodiment, the mechanical arms 601 are electrically connected to the controller, and the position and height of the mechanical arms 601 are adjusted by the electrical signal of the controller, thereby realizing the fixation of the battery.

[0048] In one embodiment, further in combination with Figure 2 As shown, the pressing part 602 is in the shape of "L", and the part of the mechanical arm 601 in contact with the battery is also in the shape of "L", which can increase the contact range of the pressing part 602 and the battery, and further increase the stability of the battery.

[0049] In one embodiment, the battery needle puncture device further comprises an insulating plate 7 fixedly connected to the side of the pressing part 602 facing the battery. It should be noted that the mechanical arm is usually made of metal, and the insulating plate 7 has good heat insulation performance. By externally arranging the insulating plate 7 on the side of the mechanical arm 601 in contact with the battery, the heat generated by the thermal runaway of the battery can be prevented from being conducted to the test environment through the mechanical arm 601, thereby improving the accuracy of the battery temperature detected by the temperature acquisition unit 3, and further ensuring the accuracy of the gas collected at different stages of the battery thermal runaway according to the temperature change.

[0050] In one embodiment, the temperature collection unit 3 comprises a main body 301 and a probe 302 connected with each other, the main body 301 is arranged in the inside of the mechanical arm 601, and the probe 302 penetrates through the heat insulation plate 7 and is adapted to be in contact with the battery. The probe 302 of the temperature collection unit 3 is used to collect the temperature of the battery in contact with the battery, and the main body 301 is electrically connected with the controller to transmit the collected temperature to the controller. By arranging the main body 301 of the temperature collection unit 3 in the mechanical arm 601 and the probe 302 penetrating through the heat insulation plate 7, the temperature collection unit 3 moves together with the mechanical arm 601, so that the mechanical arm 601 can realize real-time detection of the surface temperature of the battery while fixing the battery. If the probe 302 fails after the battery is in thermal runaway, only the front end of the probe 302 protruding out of the heat insulation plate 7 needs to be cut off, and the test can be restarted, which is simple to replace, greatly reduces the time of repeated experiments, and improves the experimental efficiency.

[0051] In one embodiment, the battery piercing device further comprises a pressure sensor arranged on the mechanical arm 601 to detect the force applied by the mechanical arm 601 to the battery. By arranging the pressure sensor on the mechanical arm 601, the pressure applied by the mechanical arm 601 to the battery can be detected in real time, so as to ensure that the mechanical arm 601 applies appropriate pressure to the battery, on the one hand to fix the battery on the support platform 101, and on the other hand to avoid excessive pressure to crush the battery, thereby improving the reliability of the test results.

[0052] Preferably, the pressure sensor is electrically connected with the controller, and the controller can flexibly adjust the force applied by the mechanical arm 601 to the battery according to the pressure reading of the pressure sensor. The controller and the pressure reading cooperatively fix the battery to be tested, which is high in flexibility and good in reliability.

[0053] Preferably, the pressure sensor is arranged in the mechanical arm 601, specifically, a sensing head at one end of the pressure sensor protrudes from the heat insulation plate 7 and the other end is electrically connected with the controller through internal wiring of the mechanical arm 601. The sensing head of the pressure sensor and the probe 302 of the temperature collection unit 3 are arranged at the same position, the pressure detection result is accurate and the pressure sensor can be protected.

[0054] The use process of the battery piercing device of the embodiment is as follows:

[0055] The position and height of the mechanical arm 601 are adjusted by sending control electric signals through the controller, and the battery is fixed by the electric signals in cooperation with the pressure indication of the pressure sensor; the pressing part 602 on the mechanical arm 601 abuts against the battery through the heat insulation plate 7, the probe of the temperature acquisition unit 3 contacts the surface of the battery, so that the temperature of the battery can be collected in real time; the needle 2 in the needle assembly is extended and punctures the battery; when the battery occurs thermal runaway during the needle puncture process, the temperature collected by the temperature acquisition unit 3 rapidly rises, and the gas outlet pipeline 4 is switched from the off state to the on state; specifically, when the temperature acquisition unit 3 monitors three time nodes of obvious temperature rise, temperature decrease from the highest point, and temperature recovery to below the preset temperature value (usually 100 DEG C), the controller controls the valve body 5 to turn on the first gas outlet branch 401, the second gas outlet branch 402 and the third gas outlet branch 403 respectively, so as to collect the battery gas in three stages of starting thermal runaway, complete thermal runaway and after thermal runaway in the battery thermal runaway process, and then more comprehensively infer the causes of battery thermal runaway and the role of different components in the thermal runaway process, which can provide ideas and directions for subsequent battery improvement.

[0056] In addition, after the experiment is finished, the exhaust passage composed of the gas guide channel 201 on the needle 2, the gas outlet channel 102 on the box body 1 and the gas outlet pipeline 4 can also assist in absorbing the remaining toxic gas in the box body 1, so as to reduce the preparation time of the next test.

[0057] Although the embodiments of the present application are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery needling apparatus, characterized in that, The battery needle pricking device comprises a box (1) with a support platform (101) inside, wherein the support platform (101) is suitable for placing a battery, and an air outlet channel (102) is formed on the box (1) and penetrates the inside and outside of the box (1); a needle pricking assembly is arranged inside the box (1), wherein the needle pricking assembly comprises a needle (2) which can be selectively close to or away from the support platform (101); a temperature acquisition unit (3) is arranged inside the box (1), wherein the temperature acquisition unit (3) is suitable for acquiring the temperature of the battery; an air outlet pipeline (4) is arranged outside the box (1) and is connected to the air outlet end of the air outlet channel (102), wherein the air outlet pipeline (4) has a conduction state in communication with the air outlet channel (102) and a cut-off state in communication with the air outlet channel (102), the air outlet pipeline (4) comprises a plurality of air outlet branches, and one of the plurality of air outlet branches is in communication with the air outlet channel (102) when the air outlet pipeline (4) is in the conduction state; and a controller is electrically connected with the temperature acquisition unit (3), wherein the controller is suitable for controlling the on-off of the air outlet branch according to the temperature signal acquired by the temperature acquisition unit (3). The battery needle pricking device further comprises a valve body (5) arranged between the air outlet branch and the air outlet channel (102), wherein the valve body (5) is electrically connected with the controller. The valve body (5) has one inlet and a plurality of outlets, the inlet of the valve body (5) is in communication with the air outlet end of the air outlet channel (102), the number of the outlets of the valve body (5) is equal to the number of the air outlet branches and corresponds to the air outlet branches one by one, the valve body (5) has a closed state in which all the outlets are cut off from the inlet, and an open state in which a plurality of the outlets are in communication with the inlet. The air outlet pipeline (4) comprises three air outlet branches, and the valve body (5) has one inlet and three outlets, each of which is connected with one of the air outlet branches. The needle (2) is a hollow structure, the inner cavity of the needle (2) forms an air guide channel (201), the air inlet of the air guide channel (201) is in communication with the inside of the box (1), and the air outlet of the air guide channel (201) is in communication with the air outlet channel (102). The battery needle pricking device further comprises a pressing assembly (6) connected to the box (1) and movable relative to the support platform (101) to fix the battery on the support platform (101).

2. The battery needle stick device of claim 1, wherein, The pressing assembly (6) comprises two mechanical arms (601) arranged oppositely, the mechanical arms (601) are connected to the side wall of the box (1), one end of the mechanical arm (601) away from the box (1) has a pressing part (602) suitable for pressing the battery.

3. The battery needle stick device of claim 2, wherein, The battery needle pricking device further comprises an insulating plate (7) fixedly connected to one side of the pressing part (602) facing the battery.

4. The battery needle stick device of claim 3, wherein, ​ 5. The battery needle stick device of claim 1, wherein, ​ 6. The battery pricking device of any one of claims 1 to 5, wherein, ​ 7. The battery needle stick device of claim 6, wherein, ​ 8. The battery needle stick device of claim 7, wherein, ​ 9. The battery needle stick device of claim 8, wherein, The temperature collecting unit (3) comprises a main body part (301) and a probe (302), the main body part (301) is arranged in the inside of the mechanical arm (601), and the probe (302) penetrates through the heat insulation plate (7) and is adapted to be in contact with the battery.

10. The battery needle stick device of claim 7, wherein, The battery needling device further comprises a pressure sensor arranged on the mechanical arm (601) to detect the force applied by the mechanical arm (601) to the battery.

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