Insulation failure fault test system and method for energy storage equipment

Abstract

The invention belongs to the technical field of energy storage testing, and relates to an insulation failure fault testing system and method for energy storage equipment. The system comprises energy storage equipment for testing, conductive equipment, a switch, a data acquisition system and a test result generation module, the energy storage equipment comprises at least two columns of battery modules; the battery modules in each column are connected to form a battery module group, and insulating films of shells of the battery modules at high potential and low potential are in a damaged state; the conductive equipment is used for electrically connecting the two shells of which the insulating films are damaged, so that the battery module group forms a loop; the switch is connected between any two adjacent columns of battery modules to control the on-off of a loop; the data acquisition system is used for acquiring voltage, temperature and loop current of a battery module in the energy storage equipment when the switch is switched off and switched on; and the test result generation module determines an insulation failure fault test result according to the voltage, the temperature and the loop current. The fault test of two-point insulation failure under the actual operation condition of energy storage is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage testing, and in particular relates to an insulation failure fault testing system and method for energy storage equipment. Background Art

[0002] With the widespread application of lithium-ion battery energy storage systems, its safety issues have become increasingly prominent, becoming a key bottleneck restricting its large-scale development. Traditional lithium-ion batteries mostly use polyethylene terephthalate (PET) film as the insulating protective layer of the outer shell. However, during the production, processing, transportation and system integration process, the PET film is prone to scratches and damage, and will experience electrical and thermal aging during long-term use, leading to insulation failure. Once a closed circuit is formed between the positive or negative electrode of the battery and the outer shell, it may trigger harmful processes and side reactions inside the battery, leading to irreversible degradation of battery performance and even thermal runaway. In particular, when there is two-point insulation failure in the battery, a closed circuit will also be formed between different failed batteries, generating leakage current, which brings serious safety risks.

[0003] At present, the insulation failure test method for energy storage battery modules is still imperfect, and there is a lack of an effective equivalent test method to simulate the insulation failure of battery modules and evaluate its hazards and evolution. Therefore, developing a test method that can simulate the two-point insulation failure of battery modules and consider the impact of the charging and discharging process is of great significance to improving the safety and reliability of energy storage systems. Summary of the invention

[0004] The object of the present invention is to provide an insulation failure fault testing system and method for energy storage equipment, so as to solve the problems existing in the insulation failure fault testing method of energy storage battery module in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides an insulation failure fault testing system for an energy storage device, comprising: An energy storage device for testing, wherein the energy storage device includes at least two columns of battery modules; wherein the battery modules of each column are electrically connected to form a battery module group; in the battery module group, the insulating films of the outer shells of the battery modules at high potential and low potential are both in a damaged state; A conductive device electrically connects the two shells of the damaged insulating film to form a circuit for the battery module group; A switch, electrically connected between any two adjacent columns of battery modules, to control the on / off of the circuit; The data acquisition system is used to collect the voltage, temperature and loop current of the battery module in the energy storage device when the switch is open or closed; The test result generating module is used to determine the insulation failure fault test result according to the voltage, temperature and loop current.

[0006] Furthermore, the system also includes: The charging and discharging device is connected to the positive and negative electrodes of the battery module group; the charging and discharging device is used to charge and discharge the battery module to simulate the charging and discharging working conditions of the battery module.

[0007] Furthermore, the insulation failure test results include the temperature evolution law of the battery module with damaged insulation film, as follows: When the temperature of the battery module is lower than a, the temperature change trend of the battery module over time is:

[0008] Where a is between 100 and 200°C, T is the surface temperature of the battery module; T 0 is room temperature; t is time; t c The value range is 50~250; the value range of W is -171~171; ΔT is the step component, the value range is 0~100, and the time when the step component is greater than 0 is less than 20s; A represents the change component with a value range of 0~10; When the temperature of the battery module is greater than a, the temperature of the battery module increases suddenly, and the temperature rises sharply to above 1500°C within 0.5-3s.

[0009] Further, insulation failure test results include: Temperature evolution of battery modules with intact insulating films: When the temperature of the battery module is less than b, the temperature of the battery module is T 1 =c×t+d changing trend; When the temperature of the battery module is greater than b and the battery voltage drops, the temperature change trend of the battery module is:

[0010] Among them, b value range is 100-150℃, T 1 is the temperature of the battery module, c is 0.1~1, d is -50~0, and t is the time; y 0 The value range is 100~150. 1 The value range is -1.0 to 1, t 1 The value range is -100 to -150.

[0011] Furthermore, the switch is connected in series with a current limiting resistor; the current limiting resistor is used to simulate the contact resistance when the insulation fails.

[0012] Furthermore, the conductive device is a circuit breaker.

[0013] In a second aspect of the present invention, a method for testing insulation failure of an energy storage device is provided, wherein the energy storage device includes at least two columns of battery modules, and the method includes: Connecting the battery modules in series to obtain a battery module group; wherein a switch is provided between any two adjacent battery modules, and the switch is in an open state; Destroying the insulating films of the outer shells of the battery modules at the high potential and the low potential in the battery module group, and electrically connecting the two outer shells with the destroyed insulating films; The switch is closed to collect the voltage, temperature and loop current of the battery module inside the battery module group; and the insulation failure fault test result is determined based on the voltage, temperature and loop current.

[0014] Furthermore, the insulation failure test results include the temperature evolution law of the battery module with damaged insulation film, as follows: When the temperature of the battery module is lower than a, the temperature change trend of the battery module over time is:

[0015] Where a is between 100 and 200°C, T is the surface temperature of the battery module; T 0 is room temperature; t is time; t c The value range is 50~250; the value range of W is -171~171; ΔT is the step component, the value range is 0~100, and the time when the step component is greater than 0 is less than 20s; A represents the change component with a value range of 0~10; When the temperature of the battery module is greater than a, the temperature of the battery module increases suddenly, and the temperature rises sharply to above 1500°C within 0.5-3s.

[0016] Further, insulation failure test results include: Temperature evolution of battery modules with intact insulating films: When the temperature of the battery module is less than b, the temperature of the battery module is T 1 =c×t+d changing trend; When the temperature of the battery module is greater than b and the battery voltage drops, the temperature change trend of the battery module is:

[0017] Among them, b value range is 100-150℃, T 1 is the temperature of the battery module, c is 0.1~1, d is -50~0, and t is the time; y 0The value range is 100~150. 1 The value range is -1.0 to 1, t 1 The value range is -100 to -150.

[0018] A third aspect of the present invention provides a method for testing insulation failure of an energy storage device, the method comprising: Connecting the battery modules in series to obtain a battery module group; wherein a switch is provided between any two adjacent battery modules, and the switch is in an open state; Destroying the insulating films of the outer shells of the battery modules at the high potential and the low potential in the battery module group, and electrically connecting the two outer shells with the destroyed insulating films; Connecting the charging and discharging equipment to the positive and negative electrodes of the battery module group; The switch is closed, and under the condition that the charging and discharging equipment is charging and discharging the battery module, the voltage, temperature and loop current of the battery module inside the battery module group are collected; and the insulation failure fault test result is determined according to the voltage, temperature and loop current.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes an insulation failure fault test system for energy storage equipment. The system can effectively evaluate the fault evolution law of the energy storage system under actual operating conditions by simulating the two-point insulation failure of the battery module, and provide important guidance for the insulation design and protection of the energy storage system. Specifically, this scheme simulates the two-point insulation failure of the battery module by destroying and connecting the battery shell insulation film at the high potential and low potential of the battery module, and considers the insulation failure fault test of the battery module under the influence of the charging and discharging process. By connecting the charging and discharging machine, the charging and discharging conditions of the battery module in the energy storage system are simulated, and the hazards and evolution laws of the insulation failure fault are more comprehensively evaluated.

[0020] In the test system, by connecting a current-limiting resistor in series, the contact resistance during insulation failure can be simulated, and the influence of loop resistance on the fault process can be further analyzed. This will provide a more accurate understanding of the performance of insulation failure in actual applications and provide more targeted measures for fault protection.

[0021] The present invention utilizes a data acquisition system to collect parameters such as voltage, temperature and loop current of the battery module in real time, analyzes and processes the collected data through a test result generation module, and generates insulation failure fault test results, providing strong support for the study of fault evolution laws. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A schematic diagram of a two-point insulation failure test of an energy storage battery module in an embodiment of the present invention; Figure 2 A schematic diagram of a two-point insulation failure test of an energy storage battery module considering the effects of charge and discharge in an embodiment of the present invention; Figure 3 This is a design diagram of an equivalent simulation test for a two-point insulation failure of a battery module in an embodiment of the present invention; Figure 4 This is a thermal runaway temperature diagram of two lithium iron phosphate batteries at two insulation failure points in an embodiment of the present invention; Figure 5 This is a temperature change curve of thermal runaway of the battery module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0024] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0025] Example 1 The embodiment of the present invention provides an insulation failure fault testing system for energy storage equipment. The system tests the thermal runaway process when the insulation of the energy storage equipment fails at two points, and obtains the evolution mechanism of the thermal runaway and thermal runaway propagation process of the battery module, which is of great significance for the insulation failure detection and fault protection of the energy storage equipment. Specifically, this scheme simulates the two-point insulation failure situation in the energy storage device by destroying the insulation of two battery modules in the energy storage device and connecting the outer shell; simulates the impact of the charging and discharging process on the insulation failure hazard of the energy storage device by disconnecting the circuit and designing the experimental process, and can obtain the thermal runaway evolution image of the battery module when the insulation fails at two points, the battery thermal runaway temperature change, the battery module voltage change, the module voltage change, the loop current change and the battery morphology before and after the failure.

[0026] like Figure 1 As shown, an insulation failure fault testing system for energy storage equipment includes: An energy storage device for testing, wherein the energy storage device includes at least two columns of battery modules; wherein the battery modules of each column are electrically connected to form a battery module group; in the battery module group, the insulating films of the outer shells of the battery modules at high potential and low potential are both in a damaged state; A conductive device electrically connects the two shells of the damaged insulating film to form a circuit for the battery module group; A switch, electrically connected between any two adjacent columns of battery modules, to control the on / off of the circuit; The data acquisition system is used to collect the voltage, temperature and loop current of the battery module in the energy storage device when the switch is open or closed; The test result generating module is used to determine the insulation failure fault test result according to the voltage, temperature and loop current.

[0027] In one embodiment, the battery modules in the same column are connected in series. The battery modules can be arranged in two columns, and the two columns of battery modules are connected in series to form a simple battery module group. There can also be three columns of battery modules, and the three columns of battery modules can be connected in series, or two columns can be connected in parallel and then connected in series with another column, or two columns can be connected in series and then connected in parallel with another column. This solution does not limit the series-parallel relationship between the battery modules in each column, as long as the battery modules in each column can be electrically connected and used to build a circuit later.

[0028] In one embodiment, each column of battery modules is fixed by a clamping plate to form a whole.

[0029] In one embodiment, in order to meet the test requirements, the insulating films of the shells of the two battery modules at the high potential and low potential in the battery module group are destroyed, and then the two battery shells with damaged insulation are connected. There are three ways to connect the two battery shells with damaged insulation films. One is direct contact, the second is to connect the two battery shells using a line or a connecting row, and the third is to connect the two battery shells using a line, and the connection is controlled by a DC circuit breaker in the middle. Between each column of the battery module group, it is connected to the DC circuit breaker through an external line. The DC circuit breaker is used to control the opening and closing of the circuit. A current limiting resistor can be installed in the circuit to control the contact resistance when the insulation of the two points of the battery module fails. The value of the current limiting resistor is 0-1000Ω.

[0030] In one embodiment, the system further includes a monitoring device for collecting images of the experimental process.

[0031] In one embodiment, the data acquisition system may be a data acquisition instrument capable of collecting data such as voltage, temperature, and loop current.

[0032] The test process includes the following steps: 1. Record basic information such as model, voltage, capacity, etc. of lithium-ion battery module test samples.

[0033] 2. According to Figure 1 The battery modules and data testing system are arranged, and the DC circuit breaker is in the disconnected state.

[0034] 3. Turn on the data acquisition system to collect the battery voltage, temperature and loop current inside the battery module in real time.

[0035] 4. Close the circuit breaker so that the battery module forms a circuit through the circuit breaker and the two battery casings with failed insulation.

[0036] 5. If you need to consider the impact of contact resistance when insulation fails, you can adjust the size of the current limiting resistor.

[0037] In a preferred embodiment, the system further comprises: a charging and discharging device connected to the positive and negative electrodes of the battery module group; the charging and discharging device is used to charge and discharge the battery module to simulate the charging and discharging conditions of the battery module.

[0038] like Figure 2 As shown, the charging and discharging device is a controllable charging and discharging machine, and the conductive device is a first circuit breaker; the insulating film of the shell of the two batteries at the high potential and low potential in the battery module group is destroyed, and then the two battery shells with damaged insulation are connected. The connection method of the two insulating film damaged battery shells is to connect the two battery shells by using a line, and the connection and disconnection are controlled by the first circuit breaker in the middle. Each column of battery modules is connected to the DC circuit breaker through an external line. The DC circuit breaker is used to control the opening and closing of the loop. A current limiting resistor can be installed in the loop to control the contact resistance when the insulation of the battery module fails at two points. The resistance value is 0-1000Ω. A charging and discharging machine is connected between the total positive and total negative of the battery module group, and the battery module can be charged and discharged to simulate the charging and discharging conditions of the battery module in the energy storage system. Test parameters such as battery module voltage, temperature, and loop current.

[0039] The test process is as follows: 1. Record basic information such as model, voltage, capacity, etc. of lithium-ion battery module test samples; 2. According to Figure 2 The battery modules and data testing system are arranged, the first circuit breaker and the DC circuit breaker are in the disconnected state, and the charging and discharging machine is in the turned-off state.

[0040] 3. Turn on the data acquisition system to collect the battery voltage, temperature, and loop current inside the battery module in real time.

[0041] 4. The following three steps include closing the first circuit breaker, starting the charging and discharging machine, and closing the DC circuit breaker. The order of the steps can be adjusted freely to simulate the two-point insulation failure condition during the charging and discharging process.

[0042] 5. If you need to consider the impact of contact resistance when insulation fails, you can adjust the size of the current limiting resistor.

[0043] In one embodiment, the insulation failure test result includes the temperature evolution law of the battery module with the damaged insulation film, as follows: (1) When the temperature of the battery module is lower than a, the temperature change trend of the battery module over time is:

[0044] Where a is between 100 and 200 °C; T is the surface temperature of the battery module, in °C; T 0 is room temperature; t is time, unit is s; t c The value range is 50~250; the value range of W is -171~171; ΔT is the step component, the value range is 0~100, and the time when the step component is greater than 0 is less than 20s; A represents the change component with a value range of 0~10; (2) When the temperature of the battery module is greater than a, the temperature of the battery module increases suddenly, and the temperature rises sharply to above 1500°C within 0.5-3s.

[0045] In one embodiment, the insulation failure test result includes the temperature evolution law of the battery module whose insulation film is not damaged, as follows: (1) When the temperature of the battery module is lower than b, the temperature of the battery module is T 1 =c×t+d changing trend; (2) When the temperature of the battery module is greater than b and the battery voltage drops, the temperature change trend of the battery module is:

[0046] Among them, b value range is 100-150℃, T 1 is the temperature of the battery module, c is 0.1~1, d is -50~0, and t is the time; y 0 The value range is 100~150. 1 The value range is -1.0 to 1, t 1 The value range is -100 to -150.

[0047] The present invention simulates the fault condition when the insulation of the battery module fails at two points by destroying the two battery insulation films in the battery module and connecting the battery shell. The test includes two modes: considering the impact of charging and discharging and not considering the impact of charging and discharging. The impact of the loop resistance on the fault process when the insulation fails can be considered. The fault condition when the insulation of the battery module fails at two points under the actual operating conditions of the energy storage system can be tested to obtain the evolution law of the battery module fault, providing guidance for the insulation design and protection of the energy storage system.

[0048] Example 2 A method for testing insulation failure of an energy storage device is implemented based on the system in the above-mentioned embodiment 1; wherein the energy storage device includes at least two columns of battery modules, and the method includes: Connecting the battery modules in series to obtain a battery module group; wherein a switch is provided between any two adjacent battery modules, and the switch is in an open state; Destroying the insulating films of the outer shells of the battery modules at the high potential and the low potential in the battery module group, and electrically connecting the two outer shells with the destroyed insulating films; The switch is closed to collect the voltage, temperature and loop current of the battery module inside the battery module group; and the insulation failure fault test result is determined based on the voltage, temperature and loop current.

[0049] The insulation failure test results include the temperature evolution law of the battery module with damaged insulation film, as follows: When the temperature of the battery module is lower than a, the temperature change trend of the battery module over time is:

[0050] Where a is between 100 and 200°C, T is the surface temperature of the battery module; T 0 is room temperature; t is time; t c The value range is 50~250; the value range of W is -171~171; ΔT is the step component, the value range is 0~100, and the time when the step component is greater than 0 is less than 20s; A represents the change component with a value range of 0~10; When the temperature of the battery module is greater than a, the temperature of the battery module increases suddenly, and the temperature rises sharply to above 1500°C within 0.5-3s.

[0051] The insulation failure test results include the temperature evolution law of the battery module with intact insulation film, as follows: When the temperature of the battery module is less than b, the temperature of the battery module is T 1 =c×t+d changing trend; When the temperature of the battery module is greater than b and the battery voltage drops, the temperature change trend of the battery module is:

[0052] Among them, b value range is 100-150℃, T 1 is the temperature of the battery module, c is 0.1~1, d is -50~0, and t is the time; y 0 The value range is 100~150. 1 The value range is -1.0 to 1, t 1 The value range is -100 to -150.

[0053] A preferred embodiment, based on the above solution, also provides a method for testing insulation failure of an energy storage device, the method comprising the following specific steps: Connecting the battery modules in series to obtain a battery module group; wherein a switch is provided between any two adjacent battery modules, and the switch is in an open state; Destroying the insulating films of the outer shells of the battery modules at the high potential and the low potential in the battery module group, and electrically connecting the two outer shells with the destroyed insulating films; Connecting the charging and discharging equipment to the positive and negative electrodes of the battery module group; The switch is closed, and under the condition that the charging and discharging equipment is charging and discharging the battery module, the voltage, temperature and loop current of the battery module inside the battery module group are collected; and the insulation failure fault test result is determined according to the voltage, temperature and loop current.

[0054] In the above scheme, the simulation of two-point insulation failure of the battery module is achieved by "destroying the insulating film of the outer shell of the battery at the high potential and low potential in the battery module, and connecting the two battery shells". When the influence of the charging and discharging process is not considered, the test steps include: closing the circuit breaker so that the battery module forms a circuit through the circuit breaker and the two battery shells with insulation failure. When considering the influence of the charging and discharging process on the two-point insulation failure fault, the two insulation failure battery shells are connected by lines during module layout, and the connection is controlled by the circuit breaker in the middle to simulate the two-point insulation failure of the battery module. The experiment includes three steps: closing the first circuit breaker, turning on the charging and discharging machine, and closing the DC circuit breaker to simulate the two-point insulation failure condition during the charging and discharging process.

[0055] A specific example is provided below to further introduce the system and method of the present invention.

[0056] The battery module group used in this experiment is as follows Figure 3 It is shown that it contains 26 battery modules with a total capacity of 26.94kWh and a total voltage of 85.8V. It contains two columns of battery modules, and the battery modules are connected in series. Among them, the two columns of battery modules are disconnected by a DC circuit breaker to avoid the generation of a fault circuit before the experiment. The battery module is clamped by a splint to prevent damage to the battery module structure caused by thermal expansion. In the battery module group, the shells at the total positive and total negative positions are destroyed and connected by a conductive copper bus, so that the two battery shells are directly connected to simulate the fault situation when the insulation fails at two points in the battery module. In addition, outside the battery module group, the battery shell at the total negative position is connected to the positive electrode of the battery at the total negative position through a DC power supply (charger and discharger), and a voltage of 80V-150A is applied between the positive electrode and the shell.

[0057] At the beginning of the experiment, the data acquisition instrument and the monitoring instrument are first turned on to collect the experimental process parameters and images in real time, and then the DC circuit breaker is closed and the DC power supply is turned on, so that the battery module forms a closed loop at the insulation failure point.

[0058] Figure 4 The thermal runaway temperature change curves of the two lithium iron phosphate batteries at two insulation failure points show that, compared with T6, T1 is the first to experience temperature rise, reaching 128°C at 138s, followed by drastic temperature fluctuations, reaching over 1000°C.

[0059] Figure 5 The temperature change curve inside the battery module shows that the thermal runaway of the battery module spread to battery No. 4 at 2420s, and the maximum surface temperature T2 of the battery reached 737°C. The surface temperature of battery No. 7 rose to 418°C at 3210s, and then T3 rose sharply again to 831°C at 4860s.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An insulation failure test system for energy storage equipment, characterized in that: include: An energy storage device for testing, wherein the energy storage device includes at least two columns of battery modules; wherein the battery modules in each column are electrically connected to form a battery module group; in the battery module group, the insulating films of the outer shells of the battery modules at high potential and low potential are both in a damaged state; A conductive device electrically connects the two shells of the damaged insulating film to form a circuit for the battery module group; A switch, electrically connected between any two adjacent columns of battery modules, to control the on / off of the circuit; The data acquisition system is used to collect the voltage, temperature and loop current of the battery module in the energy storage device when the switch is open or closed; The test result generating module is used to determine the insulation failure fault test result according to the voltage, temperature and loop current.

2. The insulation failure test system for energy storage equipment according to claim 1, characterized in that: The system further comprises: The charging and discharging device is connected to the positive and negative electrodes of the battery module group; the charging and discharging device is used to charge and discharge the battery module to simulate the charging and discharging working conditions of the battery module.

3. The insulation failure test system for energy storage equipment according to claim 1, characterized in that: The insulation failure test results include the temperature evolution law of the battery module with damaged insulation film, as follows: When the temperature of the battery module is lower than a, the temperature change trend of the battery module over time is: Where a is between 100 and 200 °C, T is the surface temperature of the battery module, T0 is the room temperature, t is the time, and t c The value range is 50~250; the value range of W is -171~171; ΔT is the step component, the value range is 0~100, and the time when the step component is greater than 0 is less than 20s; A represents the change component with a value range of 0~10; When the temperature of the battery module is greater than a, the temperature of the battery module increases suddenly, and the temperature rises sharply to above 1500°C within 0.5-3s.

4. The insulation failure test system for energy storage equipment according to claim 1, characterized in that: Insulation failure test results include: Temperature evolution of battery modules with intact insulating films: When the temperature of the battery module is less than b, the temperature of the battery module shows a change trend of T1=c×t+d; When the temperature of the battery module is greater than b and the battery voltage drops, the temperature change trend of the battery module is: Among them, b ranges from 100 to 150°C, T1 is the temperature of the battery module, c ranges from 0.1 to 1, d ranges from -50 to 0, and t is time; y The value range of 0 is 100~150, the value range of A1 is -1.0 to 1, and the value range of t1 is -100 to -150.

5. The insulation failure test system for energy storage equipment according to claim 1, characterized in that: The switch is connected in series with a current-limiting resistor; the current-limiting resistor is used to simulate the contact resistance when the insulation fails.

6. The insulation failure test system for energy storage equipment according to claim 1, characterized in that: The conductive device is a circuit breaker.

7. A method for testing insulation failure of an energy storage device, wherein the energy storage device comprises at least two columns of battery modules, characterized in that: The method comprises: Connecting the columns of battery modules in series to obtain a battery module group; wherein a switch is provided between any two adjacent columns of battery modules, and the switch is in an open state; Destroying the insulating films of the outer shells of the battery modules at the high potential and the low potential in the battery module group, and electrically connecting the two outer shells with the destroyed insulating films; The switch is closed to collect the voltage, temperature and loop current of the battery module inside the battery module group; and the insulation failure fault test result is determined based on the voltage, temperature and loop current.

8. The insulation failure test method of energy storage equipment according to claim 7, characterized in that: The insulation failure test results include the temperature evolution law of the battery module with damaged insulation film, as follows: When the temperature of the battery module is lower than a, the temperature change trend of the battery module over time is: Where a is between 100 and 200 °C, T is the surface temperature of the battery module, T0 is the room temperature, t is the time, and t c The value range is 50~250; the value range of W is -171~171; ΔT is the step component, the value range is 0~100, and the time when the step component is greater than 0 is less than 20s; A represents the change component with a value range of 0~10; When the temperature of the battery module is greater than a, the temperature of the battery module increases suddenly, and the temperature rises sharply to above 1500°C within 0.5-3s.

9. The insulation failure test method of energy storage equipment according to claim 7, characterized in that: Insulation failure test results include: Temperature evolution of battery modules with intact insulating films: When the temperature of the battery module is less than b, the temperature of the battery module shows a change trend of T1=c×t+d; When the temperature of the battery module is greater than b and the battery voltage drops, the temperature change trend of the battery module is: Among them, b ranges from 100 to 150°C, T1 is the temperature of the battery module, c ranges from 0.1 to 1, d ranges from -50 to 0, and t is time; y The value range of 0 is 100~150, the value range of A1 is -1.0 to 1, and the value range of t1 is -100 to -150.

10. A method for testing insulation failure of energy storage equipment, characterized in that: The method comprises: Connecting the columns of battery modules in series to obtain a battery module group; wherein a switch is provided between any two adjacent columns of battery modules, and the switch is in an open state; Destroying the insulating films of the outer shells of the battery modules at the high potential and the low potential in the battery module group, and electrically connecting the two outer shells with the destroyed insulating films; Connecting the charging and discharging equipment to the positive and negative electrodes of the battery module group; The switch is closed, and under the condition that the charging and discharging equipment is charging and discharging the battery module, the voltage, temperature and loop current of the battery module inside the battery module group are collected; and the insulation failure fault test result is determined according to the voltage, temperature and loop current.

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