Test method, system, apparatus, and medium for lithium-ion battery insulation failure boundary

Abstract

The application discloses a kind of lithium ion battery insulation failure boundary test method, system, equipment and medium, comprising: measuring the lithium ion battery positive shell insulation failure voltage value U error11 、Lithium ion battery shell-positive electrode insulation failure voltage value U error12 、Lithium ion battery negative shell insulation failure voltage value U error13 And lithium ion battery shell-negative electrode insulation failure voltage value U error14 The minimum value of the lithium ion battery positive shell insulation failure voltage value U error11 、Lithium ion battery shell-positive electrode insulation failure voltage value U error12 、Lithium ion battery negative shell insulation failure voltage value U error13 And lithium ion battery shell-negative electrode insulation failure voltage value U error14 As the insulation failure boundary of battery module, this method, system, equipment and medium can test the insulation failure boundary of lithium ion battery.

Description

Technical Field

[0001] This invention belongs to the field of battery technology and relates to a test method, system, equipment and medium for the insulation failure boundary of lithium-ion batteries. Background Technology

[0002] Energy storage is a key supporting technology for building new power systems and an effective means of achieving power grid supply and demand balance and flexible regulation. Energy storage can effectively improve the flexibility, economy, and security of power systems and solve the problem of renewable energy integration. Lithium-ion battery energy storage systems, due to their comprehensive advantages in safety, cost, technical performance, and environmental friendliness, have become the new energy storage technology with the largest installed capacity and widest application range globally. However, by the end of 2023, nearly 100 fires or explosions had occurred at lithium-ion energy storage power stations worldwide, highlighting the significant safety risks of lithium-ion battery energy storage systems. Among these risks, electrical abuse is one of the key causes of battery thermal runaway.

[0003] Currently, domestic and international research on the evolution and mechanisms of thermal runaway and explosion caused by the abuse of electrochemical energy storage batteries mainly focuses on overcharging and over-discharging. In addition, insulation failure is also a major cause of thermal runaway in lithium batteries. However, there is limited research on the thermal runaway boundary and mechanism caused by insulation failure. Existing research mainly focuses on the breakdown voltage and influencing factors of the battery insulation coating, the mechanism of polar overvoltage disasters induced by insulation failure in individual lithium-ion battery cells, the concentration point of electric field distribution in battery clusters, and insulation risks. Testing for the insulation failure boundary of lithium-ion batteries is still incomplete. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method, system, device and medium for testing the insulation failure boundary of lithium-ion batteries. This method, system, device and medium can test the insulation failure boundary of lithium-ion batteries.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In one aspect, the method for testing the insulation failure boundary of a lithium-ion battery according to the present invention includes:

[0007] Measurement of the lithium-ion battery positive electrode-casing insulation failure voltage U at different locations within the battery module error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value Uerror12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of the battery module;

[0008] Measurement of the lithium-ion battery positive electrode-casing insulation failure voltage U at different locations of the lithium-ion battery module in the lithium-ion battery cluster. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The minimum value in the range is used as the insulation failure boundary of the lithium-ion battery cluster.

[0009] The further improvement of the test method for the insulation failure boundary of lithium-ion batteries described in this invention lies in:

[0010] Furthermore, the lithium-ion battery positive electrode-casing insulation failure voltage U was measured at different positions within the battery module. error11 The process is as follows:

[0011] Take a fault simulation voltage source and a current limiting resistor. Connect the positive terminal of the lithium-ion battery to the positive terminal of the fault simulation voltage source. Connect the current collector on the lithium-ion battery to one end of the current limiting resistor. Connect the other end of the current limiting resistor to the negative terminal of the fault simulation voltage source.

[0012] The lithium-ion battery was placed in different positions within the battery module, and the lithium-ion battery positive electrode-casing insulation failure voltage U was measured at these different positions within the battery module. error11 .

[0013] Furthermore, the measured lithium-ion battery casing-positive electrode insulation failure voltage U is measured at different positions of the lithium-ion battery in the battery module. error12 The process is as follows:

[0014] Take a fault simulation voltage source and a current-limiting resistor. Connect the positive terminal of the fault simulation voltage source to the negative terminal of the lithium-ion battery. Connect the current collector on the lithium-ion battery to the negative terminal of the fault simulation voltage source through the current-limiting resistor.

[0015] The lithium-ion battery was placed in different positions within the battery module, and the lithium-ion battery casing-positive electrode insulation failure voltage U was measured at these different positions. error12 .

[0016] Furthermore, the measured lithium-ion battery negative electrode-casing insulation failure voltage value U at different positions of the lithium-ion battery in the battery module is... error13 The process is as follows:

[0017] Take a fault simulation voltage source and a current-limiting resistor. Connect the positive terminal of the fault simulation voltage source to the current collector, and connect the positive terminal of the lithium-ion battery to the negative terminal of the fault simulation voltage source through the current-limiting resistor.

[0018] The lithium-ion battery was placed in different positions within the battery module, and the lithium-ion battery negative electrode-casing insulation failure voltage U was measured at these different positions. error13 .

[0019] Furthermore, the measured lithium-ion battery casing-negative electrode insulation failure voltage value U is measured at different positions of the lithium-ion battery in the battery module. error14 The process is as follows:

[0020] Take a fault simulation voltage source and a current-limiting resistor. Connect the positive terminal of the fault simulation voltage source to the current collector, and connect the negative terminal of the lithium-ion battery to the negative terminal of the fault simulation voltage source through the current-limiting resistor.

[0021] The lithium-ion battery was placed in different positions within the battery module, and the lithium-ion battery casing-negative electrode insulation failure voltage U was measured at these different positions. error14 .

[0022] Furthermore, the lithium-ion battery is located at different positions in the battery module, including at least one of the corners, the middle of the upper side, the middle of the side, and the center of the battery module.

[0023] Furthermore, the battery module is located at different positions in the lithium-ion battery cluster, including at least one battery module at the top, middle, and bottom of the lithium-ion battery cluster.

[0024] In a second aspect, the testing system for the insulation failure boundary of a lithium-ion battery according to the present invention includes:

[0025] The first measurement module is used to measure the lithium-ion battery positive electrode-casing insulation failure voltage U at different positions of the lithium-ion battery in the battery module. error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of the battery module;

[0026] The second measurement module is used to measure the lithium-ion battery positive electrode-casing insulation failure voltage U at different positions of the battery module in the lithium-ion battery cluster. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The minimum value in the range is the insulation failure boundary of the lithium-ion battery cluster.

[0027] In three aspects, the computer device of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the test method for the insulation failure boundary of the lithium-ion battery.

[0028] In four aspects, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the test method for the insulation failure boundary of a lithium-ion battery.

[0029] The present invention has the following beneficial effects:

[0030] The testing method, system, equipment, and medium for lithium-ion battery insulation failure boundaries described in this invention, in specific operation, determine the insulation failure boundaries of the battery module and the lithium-ion battery cluster based on the insulation failure voltage values ​​of the positive electrode-shell, the shell-positive electrode, the negative electrode-shell, and the shell-negative electrode. This provides strong support for the efficient identification and protection of weak points in the insulation tolerance of lithium-ion batteries, reduces economic losses and safety failures caused by insulation failure, ensures the safe and stable operation of the battery system, and is of great significance for ensuring the safe and reliable operation and large-scale development of battery energy storage systems. Attached Figure Description

[0031] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 Circuit diagram for measuring the insulation failure voltage between the positive electrode and the outer casing of a lithium-ion battery;

[0033] Figure 2 This is a schematic diagram showing the placement of lithium-ion batteries in different positions within battery module 9.

[0034] Figure 3 A schematic diagram showing the battery module 9 positioned at different locations within the battery cluster;

[0035] Figure 4 This is a system structure diagram of the present invention.

[0036] Among them, 1 is the negative electrode of lithium-ion battery, 2 is the positive electrode of lithium-ion battery, 3 is the current collector, 4 is the temperature sensor, 5 is the voltage sensor, 6 is the current sensor, 7 is the current limiting resistor, 8 is the fault simulation voltage source, and 9 is the battery module. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0038] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0039] Example 1

[0040] The test method for the insulation failure boundary of lithium-ion batteries described in this invention includes the following steps:

[0041] 1) Test the lithium-ion battery;

[0042] Step 1) The preliminary preparations for the test are as follows:

[0043] 11) Record the model, voltage, and capacity information of the lithium-ion battery;

[0044] 12) Maintain the ambient temperature of the test room at the standard value and ensure that ventilation, explosion-proof and fire prevention facilities are in place. The standard value is 25°C.

[0045] 13) Perform initial charging of the lithium-ion battery at its rated power;

[0046] 14) Connect a conductive copper busbar tightly to the lower right corner of the front of the lithium-ion battery casing to increase the current flow area during the test.

[0047] 15) Use an insulating clamping device to fix the conductive copper busbars on the surface of the lithium-ion battery and the battery casing.

[0048] 2) Circuit connections for failure boundary testing;

[0049] For details, please refer to Figure 1 The positive electrode 2 of the lithium-ion battery is connected to the positive electrode of the fault simulation voltage source 8; the current collector 3 on the lithium-ion battery is connected to one end of the current limiting resistor 7, and the other end of the current limiting resistor 7 is connected to the negative electrode of the fault simulation voltage source 8; the first voltage sensor 5 is connected in parallel between the negative electrode 1 and the positive electrode 2 of the lithium-ion battery, the second voltage sensor 5 is connected in parallel between the negative electrode 1 and the current collector 3, and the third voltage sensor 5 is connected in parallel between the positive electrode 2 and the current collector 3; the current sensor 6 is connected in series at the positive electrode of the fault simulation voltage source 8; and temperature sensors 4 are installed on the left and right sides of the surface where the negative electrode 1 and the positive electrode 2 of the lithium-ion battery are located, the left, right, upper and lower sides of the surface where the current collector 3 is located, and at the current collector 3.

[0050] 3) Set the starting voltage of the fault simulation voltage source 8 to 0kV, the test voltage to 5kV, and the leakage current protection limit to 10mA. Increase the output voltage of the fault simulation voltage source 8 to the test voltage within 10s and maintain it for 60s. Record the test voltage and leakage current, and record test phenomena such as breakdown and flashover. Reduce the output voltage of the fault simulation voltage source 8 uniformly to below 1.25kV within 5s. Then increase the DC test voltage in 0.5kV steps. Repeat the above test steps until the voltage measured by the first voltage sensor 5 drops sharply and the current measured by the current sensor 6 rises above 10A. Stop the test and repeat the above steps. When the test results are the same, record the test voltage U. error11 This is the insulation failure voltage value between the positive electrode and the outer casing of the lithium-ion battery. If the battery insulation failure does not occur, the DC test voltage is increased and the above experiment is repeated until the battery insulation failure occurs.

[0051] 4) Connect the positive terminal of the fault simulation voltage source 8 to the negative terminal 1 of the lithium-ion battery, and connect the current collector 3 to the negative terminal of the fault simulation voltage source 8 through the current limiting resistor 7. Repeat step 3) and record the test voltage U. error12 This refers to the insulation failure voltage between the casing and the positive electrode of a lithium-ion battery.

[0052] 5) Connect the positive terminal of the fault simulation voltage source 8 to the current collector 3, and connect the positive terminal 2 of the lithium-ion battery to the negative terminal of the fault simulation voltage source 8 through the current limiting resistor 7. Repeat step 3) and record the test voltage U. error13 This refers to the insulation failure voltage between the negative electrode and the outer casing of a lithium-ion battery.

[0053] 6) Connect the positive terminal of the fault simulation voltage source 8 to the current collector 3, and connect the negative terminal 1 of the lithium-ion battery to the negative terminal of the fault simulation voltage source 8 through the current limiting resistor 7. Repeat step 3) and record the test voltage U. error14 This refers to the insulation failure voltage between the lithium-ion battery casing and the negative electrode.

[0054] 7)Reference Figure 2 Lithium-ion batteries were placed at different positions in battery module 9, and steps 2) to 6) were repeated to obtain the lithium-ion battery positive electrode-casing insulation failure voltage U at different positions in battery module 9. error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 Determine the lithium-ion battery positive electrode-casing insulation failure voltage U at different locations in battery module 9. error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value U in emin1 The minimum value U emin1 This serves as the insulation failure boundary for battery module 9, and the minimum value U is used as the boundary. emin1 The location of the lithium-ion battery on the corresponding battery module 9 is considered the weak point in the insulation of the battery module 9.

[0055] It should be noted that the different positions of the battery module 9 include the corners, the middle of the upper side, the middle of the side, and the center position of the battery module 9.

[0056] 8)Reference Figure 3 By placing battery module 9 at different positions within the battery cluster and repeating step 7), the lithium-ion battery positive electrode-casing insulation failure voltage value U is obtained when battery module 9 is placed at different positions within the battery cluster. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The study determined the lithium-ion battery positive electrode-casing insulation failure voltage U at different positions of the battery module 9 within the battery cluster and at different positions of the lithium-ion battery within the battery module 9. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The minimum value U in emin2 The minimum value U emin2 As the insulation failure boundary of the battery cluster, the minimum value U emin2 The location of the corresponding battery module 9 is considered a weak point in the insulation of the battery cluster.

[0057] It should be noted that the different locations of the battery cluster include the top, middle and bottom of the battery cluster.

[0058] It should be noted that this invention simulates the actual installation and electrical environment of lithium-ion batteries during actual use, and then conducts a battery insulation failure disaster simulation experiment to understand the potential insulation failure risk and insulation failure boundary of lithium-ion batteries, ensuring the safe and stable operation of the battery system. In addition, this invention also aims to improve the repeatability of the test and reduce economic losses and safety accidents caused by battery insulation failure, which is of great significance for ensuring the safe and reliable operation and large-scale development of battery energy storage systems.

[0059] Example 2

[0060] refer to Figure 4 The lithium-ion battery insulation failure boundary testing system of the present invention includes:

[0061] The first measurement module is used to measure the lithium-ion battery positive electrode-shell insulation failure voltage U at different positions in the battery module 9. error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of battery module 9;

[0062] The second measurement module is used to measure the lithium-ion battery positive electrode-casing insulation failure voltage U at different positions of the lithium-ion battery cluster in battery module 9. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The minimum value in the range is the insulation failure boundary of the lithium-ion battery cluster.

[0063] As one embodiment of the present invention, the first measurement module includes a lithium-ion battery positive electrode-shell insulation failure voltage value U for measuring the lithium-ion battery at different positions in the battery module 9. error11 The first test module includes:

[0064] The first connection module is used to take the fault simulation voltage source 8 and the current limiting resistor 7, connect the positive electrode 2 of the lithium-ion battery to the positive electrode of the fault simulation voltage source 8, connect the current collector 3 on the lithium-ion battery to one end of the current limiting resistor 7, and connect the other end of the current limiting resistor 7 to the negative electrode of the fault simulation voltage source 8.

[0065] The first experimental module is used to place the lithium-ion battery in different positions within the battery module 9 and measure the lithium-ion battery positive electrode-casing insulation failure voltage U at these different positions within the battery module 9. error11 .

[0066] In one embodiment of the present invention, the first measuring module further includes a lithium-ion battery casing-positive electrode insulation failure voltage value U for measuring the lithium-ion battery at different positions in the battery module 9. error12 The second test module includes:

[0067] The second connection module is used to take the fault simulation voltage source 8 and the current limiting resistor 7, connect the positive terminal of the fault simulation voltage source 8 to the negative terminal 1 of the lithium-ion battery, and connect the current collector 3 on the lithium-ion battery to the negative terminal of the fault simulation voltage source 8 through the current limiting resistor 7.

[0068] The second experimental module is used to place the lithium-ion battery in different positions within the battery module 9 and measure the lithium-ion battery casing-positive electrode insulation failure voltage U at these different positions. error12 .

[0069] In one embodiment of the present invention, the first measuring module further includes a lithium-ion battery negative electrode-shell insulation failure voltage value U for measuring the lithium-ion battery at different positions in the battery module 9. error13 The third test module includes:

[0070] The third connection module is used to take the fault simulation voltage source 8 and the current limiting resistor 7, connect the positive terminal of the fault simulation voltage source 8 to the current collector 3, and connect the positive terminal 2 of the lithium-ion battery to the negative terminal of the fault simulation voltage source 8 through the current limiting resistor 7.

[0071] The third experimental module is used to place the lithium-ion battery in different positions within the battery module 9 and measure the lithium-ion battery negative electrode-shell insulation failure voltage U at these different positions. error13 .

[0072] In one embodiment of the present invention, the first measuring module further includes a lithium-ion battery casing-negative electrode insulation failure voltage value U for measuring the lithium-ion battery at different positions in the battery module 9. error14 The fourth test module includes:

[0073] The fourth connection module is used to take the fault simulation voltage source 8 and the current limiting resistor 7, connect the positive terminal of the fault simulation voltage source 8 to the current collector 3, and connect the negative terminal 1 of the lithium-ion battery to the negative terminal of the fault simulation voltage source 8 through the current limiting resistor 7.

[0074] The fourth experimental module is used to place the lithium-ion battery in different positions within the battery module 9 and measure the lithium-ion battery casing-negative electrode insulation failure voltage U at these different positions. error14 .

[0075] The module division in this embodiment of the invention is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the invention can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0076] Example 3

[0077] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of a test method for determining the insulation failure boundary of a lithium-ion battery, for example including: measuring the lithium-ion battery positive electrode-casing insulation failure voltage U at different locations within a battery module 9. error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of battery module 9; the insulation failure voltage value U of the positive electrode 2-shell of lithium-ion battery module 9 at different positions of lithium-ion battery cluster is measured. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value Uerror24 The minimum value in the range is used as the insulation failure boundary of the lithium-ion battery cluster. The memory may include main memory, such as high-speed random access memory, or it may also include non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus, which can be an industry-standard architecture bus, a peripheral component interconnection standard bus, an extended industry-standard architecture bus, etc. The bus can be divided into address bus, data bus, control bus, etc. The memory is used to store programs; specifically, the program may include program code, which includes computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0078] Example 4

[0079] A computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of a test method for the insulation failure boundary of a lithium-ion battery, for example including: measuring the lithium-ion battery positive electrode-casing insulation failure voltage value U at different positions of the lithium-ion battery in a battery module 9. error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of battery module 9; the insulation failure voltage U of the positive electrode and casing of lithium-ion battery is measured at different positions of lithium-ion battery module 9. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24The minimum value in the range is used as the insulation failure boundary of the lithium-ion battery cluster. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0080] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0081] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0082] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0083] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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. A test method for the insulation failure boundary of a lithium-ion battery, characterized in that, include: The lithium-ion battery positive electrode-casing insulation failure voltage U was measured at different positions of the lithium-ion battery in the battery module (9). error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of the battery module (9); The lithium-ion battery positive electrode-casing insulation failure voltage U was measured at different positions of the lithium-ion battery module (9) in the lithium-ion battery cluster. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The minimum value in the range is used as the insulation failure boundary of the lithium-ion battery cluster.

2. The test method for the insulation failure boundary of a lithium-ion battery according to claim 1, characterized in that, The measured lithium-ion battery positive electrode-shell insulation failure voltage U at different positions in the battery module (9) is described. error11 The process is as follows: Take the fault simulation voltage source (8) and the current limiting resistor (7), connect the positive electrode (2) of the lithium-ion battery to the positive electrode of the fault simulation voltage source (8), connect the current collector (3) on the lithium-ion battery to one end of the current limiting resistor (7), and connect the other end of the current limiting resistor (7) to the negative electrode of the fault simulation voltage source (8). The lithium-ion battery was placed in different positions in the battery module (9), and the lithium-ion battery positive electrode-shell insulation failure voltage U was measured at different positions in the battery module (9). error11 .

3. The test method for the insulation failure boundary of a lithium-ion battery according to claim 1, characterized in that, The measured lithium-ion battery casing-positive electrode insulation failure voltage U is measured at different positions of the lithium-ion battery in the battery module (9). error12 The process is as follows: Take the fault simulation voltage source (8) and the current limiting resistor (7), connect the positive terminal of the fault simulation voltage source (8) to the negative terminal (1) of the lithium-ion battery, and connect the current collector (3) on the lithium-ion battery to the negative terminal of the fault simulation voltage source (8) through the current limiting resistor (7). The lithium-ion battery was placed in different positions within the battery module (9), and the lithium-ion battery casing-positive electrode insulation failure voltage U was measured at these different positions. error12 .

4. The test method for the insulation failure boundary of a lithium-ion battery according to claim 1, characterized in that, The lithium-ion battery negative electrode-shell insulation failure voltage U is measured at different positions of the lithium-ion battery in the battery module (9). error13 The process is as follows: Take the fault simulation voltage source (8) and the current limiting resistor (7), connect the positive terminal of the fault simulation voltage source (8) to the current collector (3), and connect the positive terminal (2) of the lithium-ion battery to the negative terminal of the fault simulation voltage source (8) through the current limiting resistor (7). The lithium-ion battery was placed in different positions within the battery module (9), and the lithium-ion battery negative electrode-shell insulation failure voltage U was measured at these different positions. error13 .

5. The test method for the insulation failure boundary of a lithium-ion battery according to claim 1, characterized in that, The measured lithium-ion battery casing-negative electrode insulation failure voltage U is measured at different positions of the lithium-ion battery in the battery module (9). error14 The process is as follows: Take the fault simulation voltage source (8) and the current limiting resistor (7), connect the positive terminal of the fault simulation voltage source (8) to the current collector (3), and connect the negative terminal (1) of the lithium-ion battery to the negative terminal of the fault simulation voltage source (8) through the current limiting resistor (7). The lithium-ion battery was placed in different positions within the battery module (9), and the lithium-ion battery casing-negative electrode insulation failure voltage U was measured at these different positions. error14 .

6. The test method for the insulation failure boundary of a lithium-ion battery according to claim 1, characterized in that, The lithium-ion battery is located at different positions in the battery module (9), including at least one of the corners, the middle of the upper side, the middle of the side, and the center of the battery module (9).

7. The test method for the insulation failure boundary of a lithium-ion battery according to claim 1, characterized in that, The battery module (9) is located at different positions in the lithium-ion battery cluster, including at least one battery module (9) at the top, middle and bottom of the lithium-ion battery cluster.

8. A test system for the insulation failure boundary of a lithium-ion battery, characterized in that, include: The first measurement module is used to measure the lithium-ion battery positive electrode-shell insulation failure voltage U at different positions in the battery module (9). error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The lithium-ion battery positive electrode-casing insulation failure voltage value U error11 Lithium-ion battery casing-positive electrode insulation failure voltage value U error12 Lithium-ion battery negative electrode-casing insulation failure voltage value U error13 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error14 The minimum value in the range is used as the insulation failure boundary of the battery module (9); The second measurement module is used to measure the lithium-ion battery positive electrode-shell insulation failure voltage U of the battery module (9) at different positions of the lithium-ion battery cluster. error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The lithium-ion battery positive electrode-casing insulation failure voltage value U error21 Lithium-ion battery casing-positive electrode insulation failure voltage value U error22 Lithium-ion battery negative electrode-casing insulation failure voltage value U error23 and the lithium-ion battery casing-negative electrode insulation failure voltage value U error24 The minimum value in the range is the insulation failure boundary of the lithium-ion battery cluster.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the test method for the insulation failure boundary of a lithium-ion battery as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the test method for the insulation failure boundary of a lithium-ion battery as described in any one of claims 1-7.

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