Multi-signal evolution detection device and method for safety state process of single energy storage lithium battery

Abstract

According to the multi-signal evolution detection device and method for the safety state process of the single energy storage lithium battery, the battery to be detected is fixed in the clamping space of the clamp, and the force applied to the battery to be detected by the clamp is adjusted, so that the pretightening force encountered by the battery in the assembly process is truly simulated; connecting a voltage detection device to an electrode of the to-be-detected battery after the clamp applies a pre-tightening force to the battery and after a period of stable period, and controlling a heating device to heat the to-be-detected battery, so that the temperature of the surface of the battery is increased according to a certain rate until the to-be-detected battery triggers thermal runaway; in the process, the surface temperature and voltage of the battery to be detected, the battery expansibility and the concentration and temperature data of gas sprayed out of the battery are obtained in real time through an expansibility detection device, a gas detection device, a voltage detection device and a battery temperature sensor, and the obtained data are transmitted to a computer system for comprehensive analysis. Therefore, the battery safety failure multiple signals can be comprehensively detected.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage lithium battery detection, and in particular to a multi-signal evolution detection device and method for the safety state process of a single energy storage lithium battery. Background Art

[0002] Electrochemical energy storage technology, especially lithium-ion battery technology, constitutes an indispensable pillar technology and core equipment for the new power system. However, this type of energy storage system frequently encounters safety accidents. The core problem is that it is easy to trigger safety failure during battery operation, which in turn causes thermal runaway. Once the battery thermal runaway spreads, it may cause serious disasters such as fire and even explosion. Therefore, it is crucial to implement timely and accurate active safety warning measures before the energy storage battery fails to effectively prevent the occurrence of thermal runaway and ensure the stable and reliable operation of the energy storage battery system.

[0003] Electrochemical systems, such as batteries, exhibit complex nonlinear characteristics, and in the process of their safety failure, they will show different signal characteristics in multiple physical dimensions. As the thermal safety challenges faced by lithium-ion batteries in a wide range of applications become increasingly significant, the detection research on their safety failure signals has also received widespread attention. At present, the signals used to identify abnormal battery conditions include external and observable signals such as battery casing temperature, terminal voltage, safety valve opening sound, and released gas. However, due to the time delay between the internal and external operating states of the battery, these characteristic signals often show hysteresis and inaccuracy. Therefore, it is urgent to develop a non-destructive detection device and method that can comprehensively detect multiple signals of battery safety failure. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a multi-signal evolution detection device for the safety state process of a single energy storage lithium battery, which induces safety failure of the battery to be tested through a heating device, and obtains the surface temperature, voltage, battery expansion force and concentration and temperature data of the gas ejected from the battery to be tested in real time through an expansion force detection device, a gas detection device, a voltage detection device and a battery temperature sensor, and transmits the acquired data to a computer system for comprehensive analysis, thereby being able to comprehensively detect multiple signals of battery safety failure.

[0005] In a first aspect, an embodiment of the present application provides a multi-signal evolution detection device for a safety state process of a lithium energy storage battery cell, which is used to detect an out-of-control evolution process of a battery to be tested, comprising:

[0006] A clamp, wherein a clamping space is provided in the clamp, and is used to fix the battery to be tested and apply a pre-tightening force to the battery to be tested;

[0007] A heating device, disposed in the clamping space and in close contact with a large surface of one side of the battery to be tested, for inducing thermal runaway of the battery to be tested;

[0008] An expansion force detection device is arranged in the clamping space and is in close contact with the other large surface of the battery to be tested, and is used to detect the expansion force of the battery to be tested when it is in thermal runaway;

[0009] A gas detection device, arranged around the battery to be tested, for detecting the concentration and temperature of the gas ejected when the battery to be tested is in thermal runaway;

[0010] A voltage detection device, used to detect the voltage of the battery to be tested;

[0011] The battery temperature sensor is used to detect the surface temperature of the battery to be tested.

[0012] In the technical solution of the embodiment of the present application, the battery to be tested is fixed in the clamping space of the fixture, and the fixture is adjusted according to the experimental requirements to change the force applied by the fixture to the battery to be tested, thereby truly simulating the preload force encountered by the battery during the assembly process; after the fixture applies the preload force to the battery and a period of stabilization has passed, the voltage detection device is connected to the electrode of the battery to be tested, and the heating device is controlled to heat the battery to be tested, so that the temperature of the battery surface increases at a certain rate until the battery to be tested triggers thermal runaway; in this process, the surface temperature, voltage, battery expansion force and concentration and temperature data of the gas ejected from the battery to be tested are obtained in real time through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor, and the acquired data are transmitted to the computer system for comprehensive analysis, so as to comprehensively and comprehensively detect multiple signals of battery safety failure.

[0013] In some embodiments, the clamp includes a first clamping plate, a second clamping plate, a screw and a nut. The first clamping plate and the second clamping plate are movably arranged on the screw, and the clamping space is formed between the first clamping plate and the second clamping plate. The nuts are respectively provided at both ends of the screw, and the nuts are used to adjust the pre-tightening force of the first clamping plate and the second clamping plate on the battery to be tested.

[0014] In this embodiment, the clamping force of the first clamping plate and the second clamping plate on the battery to be tested is adjusted by tightening the nut, thereby truly simulating the preload force encountered by the battery during the assembly process.

[0015] In some embodiments, the clamp includes four screw rods, the four screw rods are arranged parallel to each other, and the first clamping plate and the second clamping plate are both slidably connected to the four screw rods.

[0016] In this embodiment, the four screws can not only increase the stability of the first clamping plate and the second clamping plate when clamping the battery to be tested, but also make the force on the battery to be tested more uniform when the first clamping plate and the second clamping plate apply pre-tightening force to the battery to be tested.

[0017] In some embodiments, the expansion force detection device includes a movable plate and an expansion force sensor. The movable plate is arranged in the clamping space and is in close contact with the other large surface of the battery to be tested. The expansion force sensor is arranged between the movable plate and the first clamping plate.

[0018] In this embodiment, during the expansion process of the battery to be tested, the battery to be tested presses the expansion force sensor through the movable plate, thereby obtaining a more accurate expansion force value of the battery to be tested.

[0019] In some embodiments, a heat insulation plate is further included, and the heat insulation plate is disposed on a side of the movable plate and the second clamping plate facing the battery to be tested.

[0020] In this embodiment, by setting the heat insulation plate on the movable plate and the second clamping plate, the heat generated by the battery under test and transferred to the clamp during the thermal runaway of the battery under test can be effectively reduced, thereby more accurately characterizing the energy release during the safe failure evolution of the battery under test.

[0021] In some embodiments, a groove is provided on the partition for accommodating the battery temperature sensor.

[0022] In this embodiment, a groove for accommodating the battery temperature sensor is provided on the partition. Therefore, after the battery to be tested is fixed in the fixture, the battery temperature sensor on the surface of the battery to be tested can be exactly accommodated in the groove, thereby solving the problem that the battery temperature sensor attached to the surface of the battery to be tested will cause uneven overall force on the contact surface of the battery to be tested.

[0023] In some embodiments, the gas detection device includes: an upper gas detection device and a side gas detection device, the first gas detection device is arranged above the battery to be tested, and a group of the side gas detection devices are respectively arranged on both sides of the battery to be tested.

[0024] In this embodiment, gas detection devices are arranged in various directions of the battery to be tested to detect the gas ejected from different positions of the battery, thereby more accurately describing the energy release during the evolution of battery safety failure.

[0025] In some embodiments, the upper gas detection device includes multiple groups of gas sensors, and the multiple groups of gas sensors are arranged in sequence along a direction away from the battery to be tested.

[0026] In this embodiment, by arranging multiple groups of gas sensors in a direction away from the battery to be tested, it is possible to detect the gas temperature at different heights when a blowout occurs in the battery to be tested, thereby more accurately characterizing the energy release during the evolution of battery safety failure.

[0027] In some embodiments, a thermal insulation pad is further included, wherein the thermal insulation pad is used to support the clamp.

[0028] In this embodiment, by placing the fixture for fixing the battery to be tested on an insulating pad, the heat from external objects can be effectively prevented from being transferred to the fixture, thereby further increasing the ability to obtain more accurate test data.

[0029] In a second aspect, an embodiment of the present application provides a method for detecting a multi-signal evolution of a safety state process of a lithium-ion battery cell for energy storage, using the multi-signal evolution detection device for a safety state process of a lithium-ion battery cell for energy storage as described in any one of the above items to detect the evolution process of thermal runaway of a battery to be tested, including:

[0030] Clamping the battery to be tested in the fixture, and connecting the voltage detection device to the electrodes of the battery to be tested;

[0031] Controlling a heating device to heat the battery to be tested so that the battery to be tested triggers thermal runaway;

[0032] The surface temperature, voltage, battery expansion force and concentration and temperature data of the gas ejected from the battery are obtained through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor.

[0033] In this embodiment, the surface temperature, voltage, battery expansion force and the concentration and temperature data of the gas ejected from the battery are all collected through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor, so as to achieve more in-situ monitoring of the battery operation status, and can more thoroughly characterize the battery safety failure process, more comprehensively and comprehensively reveal the evolution law of multiple signals of battery safety failure, so as to more objectively evaluate the battery safety status.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 Schematic diagram of the structure of the multi-signal evolution detection device for the safety state process of the energy storage lithium battery cell in the embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1. First clamping plate; 2. Second clamping plate; 3. Screw; 4. Nut; 5. Heating device;

[0039] 61. movable plate; 62. expansion force sensor; 71. upper gas detection device;

[0040] 72. Side gas detection device; 8. Battery to be tested; 81. Electrode; 82. Safety valve; 9. Heat insulation board;

[0041] 10. Insulation pad. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] Electrochemical energy storage technology, especially lithium-ion battery technology, constitutes an indispensable pillar technology and core equipment for the new power system. However, this type of energy storage system frequently encounters safety accidents. The core problem is that it is easy to trigger safety failure during battery operation, which in turn causes thermal runaway. Once the battery thermal runaway spreads, it may cause serious disasters such as fire and even explosion. Therefore, it is crucial to implement timely and accurate active safety warning measures before the energy storage battery fails to effectively prevent the occurrence of thermal runaway and ensure the stable and reliable operation of the energy storage battery system.

[0051] As the thermal safety challenges faced by lithium-ion batteries in a wide range of applications become increasingly significant, the detection of safety failure signals has also received widespread attention. Currently, the signals used to identify abnormal battery conditions include external and observable signals such as battery case temperature, terminal voltage, safety valve opening sound, and released gas. However, due to the time delay between the internal and external operating states of the battery, these characteristic signals often show hysteresis and inaccuracy.

[0052] In order to solve the technical problem of how to provide a nondestructive testing device and method that can comprehensively and fully detect multiple signals of battery safety failure, the present application provides a multi-signal evolution detection device for the safety state process of a single energy storage lithium battery. A heating device is used to induce safety failure of the battery to be tested. The surface temperature, voltage, battery expansion force and concentration and temperature data of the gas ejected from the battery to be tested are obtained in real time through an expansion force detection device, a gas detection device, a voltage detection device and a battery temperature sensor. The acquired data is transmitted to a computer system for comprehensive analysis, thereby being able to comprehensively and fully detect multiple signals of battery safety failure.

[0053] Please refer to Figure 1 , Figure 1 The present invention is a schematic structural diagram of a multi-signal evolution detection device for a safety state process of a lithium battery cell provided in an embodiment of the present invention, which is used to detect the uncontrolled evolution process of a battery 8 to be tested, and includes a clamp, a heating device 5, an expansion force detection device, a gas detection device, a voltage detection device and a battery temperature sensor, wherein a clamp is provided in the clamp for fixing the battery 8 to be tested and applying a pre-tightening force to the battery 8 to be tested; the heating device 5 is arranged in the clamping space and is in close contact with a large surface of one side of the battery 8 to be tested, so as to induce thermal runaway of the battery 8 to be tested; the expansion force detection device is arranged in the clamping space and is in close contact with a large surface of the other side of the battery 8 to be tested, so as to detect the expansion force when the battery 8 to be tested is in thermal runaway; the gas detection device is arranged around the battery 8 to be tested, so as to detect the concentration and temperature of the gas ejected when the battery 8 to be tested is in thermal runaway; the voltage detection device is connected to the electrode of the battery 8 to be tested, so as to detect the voltage of the battery 8 to be tested; and the battery temperature sensor is used to detect the surface temperature of the battery 8 to be tested.

[0054] During use, the battery 8 to be tested is fixed in the clamping space of the fixture, and the fixture is adjusted according to experimental requirements to change the force applied by the fixture to the battery 8 to be tested, thereby truly simulating the preload force encountered by the battery during assembly; after the fixture applies the preload force to the battery and a period of stabilization has passed, the voltage detection device is connected to the electrode of the battery 8 to be tested, and the heating device 5 is controlled to heat the battery 8 to be tested, so that the temperature of the battery surface increases at a certain rate until the battery 8 to be tested triggers thermal runaway; in this process, the surface temperature, voltage, battery expansion force and the concentration and temperature data of the gas ejected from the battery 8 to be tested are obtained in real time through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor, and the obtained data are transmitted to the computer system for comprehensive analysis, so as to comprehensively and comprehensively detect multiple signals of battery safety failure.

[0055] In this embodiment, through clever design, the surface temperature, voltage, battery expansion force, and concentration and temperature data of the gas ejected from the battery are all collected, so as to achieve more in-situ monitoring of the battery's operating status, which can more thoroughly characterize the battery's safety failure process, and more comprehensively and comprehensively reveal the evolution law of multiple signals of battery safety failure, so as to more objectively evaluate the battery safety status. Secondly, the detection device provided by this application is easy to disassemble, low-cost, and can be reused, and can assist in the performance research of battery safety failure.

[0056] Furthermore, in an embodiment of the present application, the clamp includes a first clamping plate 1, a second clamping plate 2, a screw 3 and a nut 4. The first clamping plate 1 and the second clamping plate 2 are movably arranged on the screw 3, and a clamping space is formed between the first clamping plate 1 and the second clamping plate 2. Nuts 4 are respectively provided at both ends of the screw 3. During use, the clamping force of the first clamping plate 1 and the second clamping plate 2 on the battery 8 to be tested is adjusted by tightening the nut 4, thereby being able to truly simulate the preload force encountered by the battery during the assembly process.

[0057] Furthermore, in an embodiment of the present application, the clamp includes four screws 3, and the four screws 3 are arranged parallel to each other. The first clamp plate 1 and the second clamp plate 2 are both slidably connected to the four screws 3. Specifically, the first clamp plate 1 and the second clamp plate 2 are both rectangular structures, and through holes are arranged at corresponding positions of the corners of the first clamp plate 1 and the second clamp plate 2. The four screws 3 pass through the first clamp plate 1 and the second clamp plate 2 through the above-mentioned through holes, and the first clamp plate 1 and the second clamp plate 2 are fixed to the screws 3 by nuts 4. The four screws 3 can not only increase the stability of the first clamp plate 1 and the second clamp plate 2 when clamping the battery 8 to be tested, but also make the force on the battery 8 to be tested more uniform when the first clamp plate 1 and the second clamp plate 2 apply a pre-tightening force to the battery 8 to be tested.

[0058] Furthermore, in the embodiment of the present application, the expansion force detection device includes a movable plate 61 and an expansion force sensor 62. The movable plate 61 is arranged in the clamping space and is in close contact with the other large surface of the battery 8 to be tested. The expansion force sensor 62 is arranged between the movable plate 61 and the first clamping plate 1. When the battery 8 to be tested has thermal runaway, gas will be generated inside the battery 8 to be tested, thereby causing the battery 8 to be tested to expand. During the expansion of the battery 8 to be tested, the battery 8 to be tested presses the expansion force sensor 62 through the movable plate 61, thereby obtaining a more accurate expansion force value of the battery 8 to be tested.

[0059] Furthermore, in the embodiment of the present application, a heat insulation plate 9 is also included. The movable plate 61 and the second clamping plate 2 are both provided with a heat insulation plate 9 on one side facing the battery 8 to be tested. By providing the heat insulation plate 9 on the movable plate 61 and the second clamping plate 2, the heat generated by the battery 8 to be tested during the thermal runaway of the battery 8 to be tested can be effectively reduced and transferred to the fixture, thereby more accurately characterizing the release of energy during the safe failure evolution of the battery 8 to be tested.

[0060] Furthermore, in the embodiment of the present application, a groove is provided on the partition for accommodating a battery temperature sensor. Specifically, in the present application, the battery temperature sensor generally adopts a thin-film temperature sensor, and the battery temperature sensor is set at the center of one large surface of the battery 8 to be tested. Since the battery temperature sensor has a certain thickness, when the battery 8 to be tested is placed in the fixture, the battery temperature sensor on the surface of the battery 8 to be tested will cause the contact surface of the battery 8 to be tested to be unevenly stressed as a whole. Therefore, in order to solve the above-mentioned problem, in the present application, a groove for accommodating the battery temperature sensor is provided on the partition, so that after the battery 8 to be tested is fixed in the fixture, the battery temperature sensor on the surface of the battery 8 to be tested can be just accommodated in the groove, thereby solving the problem that the battery temperature sensor attached to the surface of the battery 8 to be tested will cause the contact surface of the battery 8 to be tested to be unevenly stressed as a whole.

[0061] Furthermore, in an embodiment of the present application, the gas detection device includes: an upper gas detection device 71 and a side gas detection device 72. The upper gas detection device 71 is arranged above the battery 8 to be tested, and a group of side gas detection devices 72 are respectively arranged on both sides of the battery 8 to be tested. By arranging gas detection devices in various directions of the battery 8 to be tested, the gas ejected from different positions of the battery is detected, thereby more accurately characterizing the energy release during the evolution of battery safety failure.

[0062] Further, in the embodiment of the present application, the upper gas detection device 71 includes multiple groups of gas sensors, and the multiple groups of gas sensors are sequentially arranged in a direction away from the battery to be tested 8. Specifically, when the safety failure of the battery to be tested 8 evolves to a certain extent, the battery will spray valves, that is, the internal pressure of the battery increases, causing the safety valve 82 on the battery to open, and the gas inside the battery to spray out. In the present application, by arranging multiple groups of gas sensors in a direction away from the battery to be tested 8, it is possible to detect the gas temperature at different heights when the battery to be tested 8 sprays valves, thereby more accurately describing the release of energy during the evolution of battery safety failure.

[0063] Furthermore, in the embodiment of the present application, an insulating pad 10 is also included. The insulating pad 10 is used to support a clamp. By preventing the clamp used to fix the battery 8 to be tested from being used on the insulating pad 10, the heat from external objects can be effectively prevented from being transferred to the clamp, thereby further increasing the ability to obtain more accurate test data.

[0064] In a second aspect, an embodiment of the present application provides a method for detecting a multi-signal evolution of a safety state process of a lithium-ion battery cell, using any of the above-mentioned multi-signal evolution detection devices for detecting a safety state process of a lithium-ion battery cell to detect the evolution process of thermal runaway of a battery 8 to be tested, including:

[0065] Clamp the battery 8 to be tested in the fixture, and connect the voltage detection device to the electrodes of the battery 8 to be tested;

[0066] Controlling the heating device 5 to heat the battery 8 to be tested, so that the battery 8 to be tested triggers thermal runaway;

[0067] The surface temperature, voltage, battery expansion force and the concentration and temperature data of the gas ejected from the battery 8 to be tested are all collected through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor, so as to achieve a more in-situ monitoring of the battery operation status, and can more thoroughly characterize the battery safety failure process, more comprehensively and comprehensively reveal the evolution law of multiple signals of battery safety failure, so as to more objectively evaluate the battery safety status.

[0068] Furthermore, in the embodiment of the present application, the heating device 5 is of a detachable design. As is known to all, battery safety failure is not limited to heating failure. Overcharging of the battery can also lead to battery safety failure. In the embodiment, the heating device 5 is removed and the battery to be tested 8 is connected to an external charger and discharger to detect the evolution process of battery safety failure caused by overcharging. Specifically, the heating device 5 is removed, the battery to be tested 8 is clamped in the fixture, and the voltage detection device and the charger and discharger are connected to the electrodes of the battery to be tested 8;

[0069] The charger and discharger are controlled to charge the battery 8 to be tested. When the battery 8 to be tested fails to be safe due to overcharging, the surface temperature, voltage, battery expansion force and the concentration and temperature data of the gas ejected from the battery 8 to be tested are obtained through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor.

[0070] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A multi-signal evolution detection device for the safety state process of a lithium battery cell for energy storage, used to detect the out-of-control evolution process of a battery to be tested, characterized in that: include A clamp, wherein a clamping space is provided in the clamp, and is used to fix the battery to be tested and apply a pre-tightening force to the battery to be tested; A heating device, disposed in the clamping space and in close contact with a large surface of one side of the battery to be tested, for inducing thermal runaway of the battery to be tested; An expansion force detection device is arranged in the clamping space and is in close contact with the other large surface of the battery to be tested, and is used to detect the expansion force of the battery to be tested when it is in thermal runaway; A gas detection device, arranged around the battery to be tested, for detecting the concentration and temperature of the gas ejected when the battery to be tested is in thermal runaway; A voltage detection device, used to detect the voltage of the battery to be tested; The battery temperature sensor is used to detect the surface temperature of the battery to be tested.

2. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 1 is characterized in that: The clamp includes a first clamping plate, a second clamping plate, a screw and a nut. The first clamping plate and the second clamping plate are movably arranged on the screw, and the clamping space is formed between the first clamping plate and the second clamping plate. The nuts are respectively provided at both ends of the screw, and the nuts are used to adjust the pre-tightening force of the first clamping plate and the second clamping plate on the battery to be tested.

3. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 2 is characterized in that: The clamp comprises four screw rods, which are arranged parallel to each other, and the first clamping plate and the second clamping plate are both slidably connected to the four screw rods.

4. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 2, characterized in that: The expansion force detection device includes a movable plate and an expansion force sensor. The movable plate is arranged in the clamping space and is in close contact with the other large surface of the battery to be tested. The expansion force sensor is arranged between the movable plate and the first clamping plate.

5. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 4 is characterized in that: It also includes a heat insulation board, and the heat insulation board is provided on the side of the movable plate and the second clamping plate facing the battery to be tested.

6. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 5 is characterized in that: The heat insulation plate is provided with a groove for accommodating the battery temperature sensor.

7. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 1, characterized in that: The gas detection device comprises: an upper gas detection device and a side gas detection device. The upper gas detection device is arranged above the battery to be tested, and a group of the side gas detection devices are respectively arranged on both sides of the battery to be tested.

8. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 1, characterized in that: The upper gas detection device comprises a plurality of groups of gas sensors, and the plurality of groups of gas sensors are arranged in sequence in a direction away from the battery to be tested.

9. The multi-signal evolution detection device for the safety state process of a lithium battery cell according to claim 1, characterized in that: Also included is a thermal insulation pad, which is used to support the clamp.

10. A method for detecting the multi-signal evolution of the safety state process of a lithium-ion battery cell for energy storage, using the multi-signal evolution detection device for the safety state process of a lithium-ion battery cell for energy storage as described in any one of claims 1 to 9 to detect the evolution process of thermal runaway of a battery to be tested, characterized in that: include: Clamping the battery to be tested in the fixture, and connecting the voltage detection device to the electrodes of the battery to be tested; Controlling a heating device to heat the battery to be tested so that the battery to be tested triggers thermal runaway; The surface temperature, voltage, battery expansion force and concentration and temperature data of the gas ejected from the battery are obtained through the expansion force detection device, the gas detection device, the voltage detection device and the battery temperature sensor.

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