Method and system for determining battery pulse heating parameters - Patents.com

Abstract

This application relates to a method and system for determining parameters of battery pulse heating. The anode reference potential of a lithium-ion battery is acquired in real time during positive and negative pulse heating under various heating parameters. The anode reference potential is the voltage difference between the anode and a reference electrode of the lithium-ion battery. The occurrence of Li plating in a lithium-ion battery is determined by determining the relationship between the anode reference potential and a threshold potential. Li plating can lead to a decrease in the battery's available capacity and membrane puncture by dendrites, which can cause the battery to short circuit, leading to thermal runaway, reduced performance, and safety risks. Therefore, when the anode reference potential is less than the threshold potential, the first heating parameters must be adjusted to avoid Li plating and extend the battery's lifespan. Recording the heating parameters when the anode reference potential is greater than the threshold potential can prevent the pulse heating parameters from significantly affecting the battery's lifespan.

Description

[Technical field]

[0001] The present application relates to the technical field of battery management, and in particular to a method and system for determining parameters of battery pulse heating. [Background technology]

[0002] Due to the wide application of lithium-ion batteries in automobiles, especially battery-powered electric vehicles, the performance of the vehicle closely depends on the performance of lithium-ion batteries. Charging scenarios at low temperatures are becoming more and more common. The problems faced by lithium-ion batteries in low-temperature environments have a great impact on practical applications. In low-temperature environments, the available energy of the battery will be reduced, energy loss will occur during discharging, and the life of the battery will be shortened in the whole life cycle. At the same time, the low-temperature environment will also increase the impedance of the battery, thereby affecting the life and safety of the battery. These problems have brought great difficulties to the use of batteries in low-temperature environments. Summary of the Invention [Problem to be solved by the invention]

[0003] To solve the above problems, the battery can be effectively heated by pulse heating method before its operation cycle. However, in the process of internal heating of the battery by pulse heating current, it is necessary to understand the changes inside the battery to ensure that the pulse heating parameters do not significantly affect the battery's life. [Means for solving the problem]

[0004] In the process of internal heating of a battery by a pulse heating current, it is necessary to understand the changes inside the battery to ensure that the pulse heating parameters do not significantly affect the battery's life, and a method and system are provided for determining the parameters of battery pulse heating.

[0005] 1. A method for determining parameters of a pulse heating battery, comprising: S100, providing a lithium ion battery having a reference electrode; S200, performing positive and negative pulse heating of the lithium ion battery under a first heating parameter; S300, during the positive and negative pulse heating process, acquiring a reference potential of the anode of the lithium ion battery in real time, the reference potential of the anode being a voltage difference between the anode of the lithium ion battery and a reference electrode, and determining whether the reference potential of the anode is less than a threshold potential; S400, if the reference potential of the anode is less than the threshold potential, adjusting the first heating parameter, and repeating steps S200 to S300 until the first heating parameter is equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential; S500, a method for determining a parameter of a pulse heating of a battery, comprising: recording an n-th heating parameter when the reference potential of the anode is greater than a threshold potential.

[0006] In one embodiment, the step S200 of performing positive and negative pulse heating of the lithium ion battery under the first heating parameters includes: placing the lithium ion battery in a temperature chamber, adjusting the temperature of the temperature chamber to a first temperature value, and leaving for a first time value; charging at a first amplitude value in a constant current mode for a second time value; Discharging at a first amplitude value in a constant current mode for a third time value, the first heating parameters including a first temperature value, a first amplitude value, a second time value, and a third time value.

[0007] In one embodiment, the steps of adjusting a first heating parameter if the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter is equal to the nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, include: If the reference potential of the anode is less than the threshold potential, the first temperature value is increased to a second temperature value, and steps S200 to S300 are repeated until the first temperature value becomes equal to the nth temperature value and the reference potential of the anode is equal to or greater than the threshold potential.

[0008] In one embodiment, when the reference potential of the anode is greater than the threshold potential, the nth temperature value, the first amplitude value, the second time value, and the third time value are recorded.

[0009] In one embodiment, the steps of adjusting a first heating parameter if the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter is equal to the nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, include: If the anode reference potential is less than the threshold potential, reducing the first amplitude value to a second amplitude value, and repeating steps S200 to S300 until the first temperature amplitude value is equal to the nth amplitude value and the anode reference potential is greater than or equal to the threshold potential.

[0010] In one embodiment, when the reference potential of the anode is greater than the threshold potential, the nth amplitude value, the first temperature value, the second time value, and the third time value are recorded.

[0011] In one embodiment, after the step S500 of recording the n-th heating parameter if the reference potential of the anode is greater than the threshold potential, the method further comprises: Optimizing the recorded n-th heating parameters to obtain a larger pulse heating rate.

[0012] In one embodiment, the reference electrode is one of a lithium metal reference electrode, an alloy reference electrode, a reference electrode coated with a polymeric material, and a battery in situ lithium plated reference electrode.

[0013] 1. A system for determining parameters of a pulse heating battery, comprising: a positive and negative pulse heating device electrically connected to the lithium ion battery at the reference electrode and used for positive and negative pulse heating of the lithium ion battery; an anode reference potential acquisition device electrically connected to the lithium ion battery and used to acquire a reference potential of the anode of the lithium ion battery, the reference potential being a voltage difference between the anode and a reference electrode of the lithium ion battery; A system for determining parameters of battery pulse heating, comprising: a judgment and processing device electrically connected to an anode reference potential acquisition device and each of the positive and negative pulse heating devices, and used for determining whether the anode reference potential is less than a threshold potential, and if the anode reference potential is less than the threshold potential, sending a signal to the positive and negative pulse heating devices for adjusting the heating parameters until the first heating parameter becomes the same as the nth heating parameter and the anode reference potential is equal to or greater than the threshold potential, and recording the nth heating parameter.

[0014] In one embodiment, the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the determination and processing device determines that the reference potential of the anode is less than the threshold potential, the determination and processing device sends a signal to the positive and negative pulse heating devices to adjust the first temperature value.

[0015] In one embodiment, the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the determination and processing device determines that the reference potential of the anode is less than the threshold potential, the determination and processing device sends a signal to the positive and negative pulse heating devices for adjustment of the first amplitude value.

[0016] The above-mentioned method for determining the parameters of battery pulse heating obtains the reference potential of the anode of the lithium ion battery in real time during the positive and negative pulse heating process under various heating parameters. The reference potential of the anode is the voltage difference between the anode and the reference electrode of the lithium ion battery. By determining the relationship between the reference potential of the anode and the threshold potential, it is determined whether Li plating occurs in the lithium ion battery. Li plating can lead to a decrease in the available capacity of the battery, and puncture of the membrane by dendrites, which causes the battery to short circuit and thermal runaway of the battery, resulting in many dangers such as reduced performance and safety risks. Therefore, when the reference potential of the anode is smaller than the threshold potential, it is necessary to adjust the first heating parameters to avoid the occurrence of Li plating and extend the life of the battery. By recording the heating parameters when the reference potential of the anode is greater than the threshold potential, it can be ensured that the pulse heating parameters do not have a significant impact on the life of the battery. [Brief description of the drawings]

[0017] [Figure 1] 2 is a flow diagram of a method for determining parameters of a battery pulse heating provided by an embodiment of the present application. [Diagram 2] FIG. 13 is a diagram of test results of the reference potential of an anode provided by an embodiment of the present application varying with temperature. [Diagram 3] FIG. 11 is a diagram of test results of the anode reference potential provided by an embodiment of the present application varying with pulse amplitude value. [Figure 4] FIG. 2 is a structural diagram of a system for determining parameters of battery pulse heating provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In order to make the above-mentioned objects, features and advantages of the present application more clear and easily understood, a specific implementation method of the present application will be described in detail by referring to the following attached drawings. In the following description, many details are provided to fully understand the present application. However, the present application is not limited to the specific implementation disclosed below, since the present application can be implemented in many ways different from this description, and those skilled in the art can make similar modifications without departing from the spirit of the present application.

[0019] It should be noted that when an element is said to be "disposed on" another element, the element may be directly on the other element, or there may be intermediate elements present. When an element is considered to be "connected" to another element, the element may be directly connected to the other element, or there may be intermediate elements present at the same time.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in the specification of this application herein are intended only to describe certain embodiments and are not intended to limit this application. The term "and / or" used herein includes any one or more of the associated listed items, and all combinations thereof.

[0021] See Figure 1. The present application provides a method for determining parameters of a battery pulse heating. The method includes:

[0022] S100, providing a lithium ion battery having a reference electrode, the reference electrode being one of a lithium metal reference electrode, an alloy reference electrode, a reference electrode coated with a polymeric material, and an in-situ lithium-plated reference electrode of the battery. In an optional embodiment, the reference electrode can be fabricated by in-situ lithium plating with a copper wire, i.e., by placing a copper wire inside the battery and inputting a constant current to form a metal plating layer on the surface of the copper wire.

[0023] S200, performing positive and negative pulse heating of a lithium ion battery under a first heating parameter. In step S200, positive and negative pulse heating under a first heating parameter can be performed on a plurality of lithium ion batteries. The steps of performing positive and negative pulse heating of a lithium ion battery under a first heating parameter can include placing the lithium ion battery in a temperature chamber, adjusting the temperature of the temperature chamber to a first temperature value, and leaving for a first time value, charging at a first amplitude value in a constant current mode for a second time value, and discharging at the first amplitude value in a constant current mode for a third time value. The first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value.

[0024] Here, the first temperature value can be 0°C, -5°C, -8°C, or -10°C. There is no limit to the first time value, as long as it is certain that the battery temperature and the temperature of the temperature chamber reach equilibrium. The first amplitude value can be 4C, 2C, 1.5C, etc. The sum of the second time value and the third time value is the duration of the pulse period. Of course, a pulse interval may be placed between the charge pulse and the discharge pulse. In this case, the duration of the pulse period is the sum of the second time value, the third time value, and the pulse interval.

[0025] S300, during the positive and negative pulse heating process, acquiring a reference potential of an anode of the lithium ion battery in real time, where the reference potential of the anode is a voltage difference between the anode of the lithium ion battery and a reference electrode, and determining whether the reference potential of the anode is less than a threshold potential.

[0026] In step S300, the threshold potential may be set to 0V. If the reference potential of the anode is less than the threshold potential, it may be considered that Li plating is occurring in the lithium ion battery. In this case, pulse heating under the heating parameters may affect the battery life. If the reference potential of the anode is equal to or greater than the threshold potential, it may be considered that Li plating is not occurring in the lithium ion battery. In this case, pulse heating under the heating parameters may not affect the battery life.

[0027] S400, if the reference potential of the anode is less than the threshold potential, adjusting the first heating parameter, and repeating steps S200 to S300 until the first heating parameter is equal to the nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential. In step S400, by continuously adjusting the heating parameters, the lithium ion battery avoids Li plating during the pulse heating process as much as possible, thereby ensuring that the life of the lithium ion battery is not affected during the pulse heating.

[0028] S500, when the reference potential of the anode is greater than the threshold potential, recording the n-th heating parameter. Through the above-mentioned method, a large number of tests can be performed to obtain the heating parameters corresponding to the battery in various charging states, create a data table, and provide a basis for parameter selection for the popularization and application of the pulse heating method.

[0029] In this embodiment, the above-mentioned method for determining parameters of battery pulse heating acquires the reference potential of the anode of the lithium ion battery in real time during the positive and negative pulse heating process under various heating parameters. The reference potential of the anode is the voltage difference between the anode and the reference electrode of the lithium ion battery. By determining the relationship between the reference potential of the anode and the threshold potential, it is determined whether Li plating occurs in the lithium ion battery. Li plating can lead to a decrease in the available capacity of the battery, and puncture of the membrane by dendrites, which causes the battery to short circuit and thermal runaway of the battery, resulting in many dangers such as reduced performance and safety risks. Therefore, when the reference potential of the anode is smaller than the threshold potential, it is necessary to adjust the first heating parameters to avoid the occurrence of Li plating and extend the life of the battery. By recording the heating parameters when the reference potential of the anode is greater than the threshold potential, it can be ensured that the pulse heating parameters do not have a significant impact on the life of the battery.

[0030] In one embodiment, the steps of adjusting a first heating parameter if the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter is equal to the nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, include: If the anode reference potential is less than the threshold potential, the first temperature value is increased to a second temperature value, and steps S200 to S300 are repeated until the first temperature value is equal to the nth temperature value and the anode reference potential is equal to or greater than the threshold potential. If the anode reference potential is greater than the threshold potential, the nth temperature value, the first amplitude value, the second time value, and the third time value are recorded. By adjusting the temperature value of the temperature chamber without changing other heating conditions, the values ​​of the anode reference potential at different temperature values ​​of the temperature chamber are obtained to obtain the effect of the temperature of the temperature chamber on the life of the battery. Please refer to FIG. 2, which is a test curve of the change of the anode reference potential with temperature when the positive and negative pulse amplitude value is 4C, the pulse period is 2s, and the state of charge is 50%. If the potential of the anode is greater than 0 after the temperature exceeds -8°C, it can be considered that Li plating has not occurred. It can be seen that the fluctuation amplitude of the anode reference potential increases as the temperature decreases.

[0031] In one embodiment, the steps of adjusting a first heating parameter if the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter is equal to the nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, include: If the anode reference potential is less than the threshold potential, the first amplitude value is reduced to a second amplitude value, and steps S200 to S300 are repeated until the first temperature amplitude value is equal to the nth amplitude value and the anode reference potential is equal to or greater than the threshold potential. If the anode reference potential is greater than the threshold potential, the nth amplitude value, the first temperature value, the second time value, and the third time value are recorded. By adjusting the pulse amplitude value without changing other heating conditions, the values ​​of the anode reference potential at different amplitude values ​​are obtained to obtain the influence of the pulse amplitude value on the battery life. Please refer to FIG. 3, which is a test curve of the change of the anode reference potential with the pulse amplitude value when the temperature of the temperature chamber is -10°C, the pulse period is 10s, and the state of charge is 50%. It can be seen that the fluctuation amplitude of the anode reference potential increases with the increase of the pulse amplitude value. During the charging pulse process of the second test period with the pulse amplitude value of 4C, if the potential of the anode is less than 0V, it can be considered that Li plating has occurred in the battery. From the curve, we can see that the larger the amplitude value, the greater the impact on the battery life. Therefore, in the initial period of pulse heating, the pulse parameters with a small amplitude value can be selected for heating, and after the temperature increases slightly, the pulse amplitude value is increased. In this way, the risk of Li plating can be further reduced.

[0032] In one embodiment, after the step S500 of recording the n-th heating parameter, if the reference potential of the anode is greater than the threshold potential, the recorded n-th heating parameter can be optimized to obtain a larger pulse heating rate. By carrying out experimental tests under different ambient temperatures and different pulse parameters, the variation of the potential of the anode is analyzed, and a reasonable solution of the pulse parameters is selected to ensure that the potential of the anode changes within a suitable range and ensure a certain temperature rise rate. In general, there is a trade-off between the influence of the pulse parameters on the temperature rise rate and the influence on the precipitation of lithium dendrites on the anode. Therefore, a joint optimization method can be used to design better pulse parameters.

[0033] Please refer to Figure 4. The present application provides a system 10 for determining parameters of battery pulse heating. The system 10 for determining parameters of battery pulse heating includes a positive and negative pulse heating device 100, an anode reference potential acquisition device 200, and a judgment and processing device 300.

[0034] The positive and negative pulse heating devices 100 are electrically connected to the lithium ion battery at the reference electrode and are used for positive and negative pulse heating of the lithium ion battery. The anode reference potential acquisition device 200 is electrically connected to the lithium ion battery and is used to acquire the reference potential of the anode of the lithium ion battery. The anode reference potential is the voltage difference between the anode and the reference electrode of the lithium ion battery. The judgment and processing device 300 is electrically connected to the anode reference potential acquisition device 200 and the positive and negative pulse heating devices 100, respectively, and is used to judge whether the anode reference potential is less than the threshold potential. If the anode reference potential is less than the threshold potential, the judgment and processing device 300 sends a signal for adjusting the heating parameter to the positive and negative pulse heating devices 100 until the first heating parameter becomes the same as the nth heating parameter and the anode reference potential is equal to or greater than the threshold potential. The nth heating parameter is recorded.

[0035] The positive and negative pulse heating device 100 can be integrated into an existing battery management system. The positive and negative pulse heating device 100 can also be a charger that can provide positive and negative pulses. The anode reference potential acquisition device 200 can include a voltage sensor. The processing device 300 can be a microprocessor, a single chip microcomputer (SCM), etc.

[0036] In an optional embodiment, the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the determination and processing device 300 determines that the anode reference potential is less than the threshold potential, the determination and processing device 300 sends a signal to the positive and negative pulse heating device 100 for adjustment of the first temperature value.

[0037] In an optional embodiment, the first heating parameter includes a first temperature value, a first amplitude value, a second time value, and a third time value, and when the determination and processing device 300 determines that the anode reference potential is less than the threshold potential, the determination and processing device 300 sends a signal to the positive and negative pulse heating device 100 for adjustment of the first amplitude value.

[0038] In this embodiment, the above-mentioned system 10 for determining parameters of battery pulse heating acquires the reference potential of the anode of the lithium ion battery in real time during the positive and negative pulse heating process under various heating parameters through the anode reference potential acquisition device 200. The anode reference potential is the voltage difference between the anode and the reference electrode of the lithium ion battery. The judgment and processing device 300 judges the relationship between the anode reference potential and the threshold potential, and whether Li plating has occurred in the lithium ion battery. Li plating may lead to a reduction in the available capacity of the battery, and puncture of the membrane by dendrites, which may cause the battery to short circuit and cause thermal runaway of the battery, resulting in many dangers such as reduced performance and safety risks. Therefore, when the anode reference potential is smaller than the threshold potential, the first heating parameters need to be adjusted to avoid the occurrence of Li plating and extend the life of the battery. By recording the heating parameters when the anode reference potential is larger than the threshold potential, the pulse heating parameters can be prevented from having a significant impact on the life of the battery.

[0039] The technical features of the above-mentioned embodiments can be freely combined. For the sake of brevity, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combinations of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments merely represent some ways of implementing the present application. Although the descriptions are specific and detailed, they should not be understood as limitations on the scope of the patent pending. It should be noted that those skilled in the art can make various changes and modifications to the embodiments without departing from the concept of the present application. All of these are included in the scope of protection of the present application. Therefore, the scope of protection of the patent based on the present application shall be subject to the scope of the attached claims. This specification includes the disclosure of the following inventions. [Item 1] A method for determining parameters of a battery pulse heating, comprising: S100, providing a lithium ion battery having a reference electrode; S200, performing positive and negative pulse heating of the lithium ion battery under first heating parameters; S300, during the positive and negative pulse heating process, acquiring a reference potential of the anode of the lithium ion battery in real time, the reference potential of the anode being a voltage difference between the anode and the reference electrode of the lithium ion battery, and determining whether the reference potential of the anode is less than a threshold potential; S400, if the reference potential of the anode is less than the threshold potential, adjusting the first heating parameter, and repeating steps S200 to S300 until the first heating parameter is equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential; S500, when the reference potential of the anode is greater than the threshold potential, recording the nth heating parameter. [Item 2] The step S200 of performing positive and negative pulse heating of the lithium ion battery under the first heating parameters, placing the lithium ion battery in a temperature chamber, adjusting the temperature of the temperature chamber to a first temperature value, and leaving for a first time value; charging at a first amplitude value in a constant current mode for a second time value; 2. The method for determining parameters of pulse heating of a battery of claim 1, comprising: discharging at the first amplitude value in a constant current mode for a third time value, wherein the first heating parameters include the first temperature value, the first amplitude value, the second time value, and the third time value. [Item 3] The steps of adjusting the first heating parameter when the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter becomes equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, 3. The method for determining parameters of pulse heating of a battery according to claim 2, comprising: increasing the first temperature value to a second temperature value when the reference potential of the anode is less than the threshold potential; and repeating steps S200 to S300 until the first temperature value becomes equal to the nth temperature value and the reference potential of the anode is equal to or greater than the threshold potential. [Item 4] The method for determining parameters of battery pulse heating described in Item 3, wherein the nth temperature value, the first amplitude value, the second time value, and the third time value are recorded when the reference potential of the anode is greater than the threshold potential. [Item 5] The steps of adjusting the first heating parameter when the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter becomes equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, If the reference potential of the anode is less than the threshold potential, reduce the first amplitude value to a second amplitude value, and repeat steps S200 to S300 until the first temperature amplitude value is equal to the n-th amplitude value and the reference potential of the anode is equal to or greater than the threshold potential. and repeating the steps of: [Item 6] The method for determining parameters of battery pulse heating described in Item 5, wherein the nth amplitude value, the first temperature value, the second time value, and the third time value are recorded when the reference potential of the anode is greater than the threshold potential. [Item 7] If the reference potential of the anode is greater than the threshold potential, after the step S500 of recording the n-th heating parameter, the method further comprises: 2. The method for determining parameters of a battery pulse heating according to claim 1, comprising optimizing the recorded nth heating parameter to obtain a larger pulse heating rate. [Item 8] The method for determining parameters of a pulse heating battery described in Item 1, wherein the reference electrode is one of a lithium metal reference electrode, an alloy reference electrode, a reference electrode coated with a polymeric material, and an in situ lithium plated reference electrode of the battery. [Item 9] A system for determining parameters of a battery pulse heating, comprising: a positive and negative pulse heating device (100) electrically connected to a lithium ion battery at a reference electrode and used for positive and negative pulse heating of the lithium ion battery; an anode reference potential acquisition device (200) electrically connected to the lithium ion battery and used to acquire the reference potential of the anode of the lithium ion battery, the reference potential being the voltage difference between the anode and the reference electrode of the lithium ion battery; a judgment and processing device (300) electrically connected to the anode reference potential acquisition device (200) and each of the positive and negative pulse heating devices (100), and used for determining whether the reference potential of the anode is less than the threshold potential, sending a signal to the positive and negative pulse heating devices (100) for adjusting the heating parameter until the first heating parameter becomes the same as the nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, if the reference potential of the anode is less than the threshold potential, and recording the nth heating parameter. [Item 10] The system for determining parameters of battery pulse heating described in Item 9, wherein the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the judgment and processing device (300) determines that the reference potential of the anode is less than the threshold potential, the judgment and processing device (300) sends a signal to the positive and negative pulse heating devices (100) for adjustment of the first temperature value. [Item 11] The system for determining parameters of battery pulse heating described in Item 9, wherein the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the judgment and processing device (300) determines that the reference potential of the anode is less than the threshold potential, the judgment and processing device (300) sends a signal to the positive and negative pulse heating devices (100) for adjustment of the first amplitude value. [Explanation of symbols]

[0041] Description of reference numbers for main elements in the accompanying drawings. A system 10 for determining parameters for pulse heating of a battery. Positive and negative pulse heating device 100. Anode reference potential acquisition device 200 . Decision and processing unit 300.

Claims

1. 1. A method for determining parameters of a pulse heating battery, comprising: Step S100: Providing a lithium ion battery having a reference electrode; Step S200 includes performing positive and negative pulse heating of the lithium ion battery under a first heating parameter; Step S300: during the positive and negative pulse heating process, obtain a reference potential of the anode of the lithium ion battery in real time, the reference potential of the anode being a voltage difference between the anode and the reference electrode of the lithium ion battery; and determine whether the reference potential of the anode is less than a threshold potential; Step S400: if the reference potential of the anode is less than the threshold potential, adjust the first heating parameter, and repeat steps S200 to S300 until the first heating parameter becomes equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential; A method for determining parameters of pulse heating of a battery, comprising: step S500: recording the n-th heating parameter when the reference potential of the anode is greater than the threshold potential.

2. The step S200 of performing positive and negative pulse heating of the lithium ion battery under the first heating parameters includes: placing the lithium ion battery in a temperature chamber, adjusting the temperature of the temperature chamber to a first temperature value, and leaving for a first time value; charging at a first amplitude value in a constant current mode for a second time value; 2. The method for determining parameters of pulse heating of a battery of claim 1, comprising: discharging at the first amplitude value in a constant current mode for a third time value, wherein the first heating parameters include the first temperature value, the first amplitude value, the second time value, and the third time value.

3. the steps of adjusting the first heating parameter when the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter becomes equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential; 3. The method for determining parameters of a pulse heating battery of claim 2, further comprising: increasing the first temperature value to a second temperature value if the reference potential of the anode is less than the threshold potential; and repeating steps S200 to S300 until the first temperature value is equal to the nth temperature value and the reference potential of the anode is equal to or greater than the threshold potential.

4. 4. The method for determining parameters of pulse heating of a battery of claim 3, wherein the nth temperature value, the first amplitude value, the second time value, and the third time value are recorded when the reference potential of the anode is greater than the threshold potential.

5. the steps of adjusting the first heating parameter when the reference potential of the anode is less than the threshold potential, and repeating steps S200 to S300 until the first heating parameter becomes equal to the n-th heating parameter and the reference potential of the anode is equal to or greater than the threshold potential; 3. The method for determining parameters of a pulsed battery heating as described in claim 2, comprising: reducing the first amplitude value to a second amplitude value if the reference potential of the anode is less than the threshold potential; and repeating steps S200 to S300 until the first amplitude value becomes equal to the nth amplitude value and the reference potential of the anode is equal to or greater than the threshold potential.

6. 6. The method for determining parameters of pulse heating of a battery of claim 5, wherein the nth amplitude value, the first temperature value, the second time value, and the third time value are recorded when the reference potential of the anode is greater than the threshold potential.

7. If the reference potential of the anode is greater than the threshold potential, after the step S500 of recording the n-th heating parameter, the method further comprises:

2. The method for determining parameters of a pulse heating battery of claim 1, comprising optimizing the recorded nth heating parameter to obtain a greater pulse heating rate.

8. 2. The method for determining a parameter of a battery pulse heating as recited in claim 1, wherein the reference electrode is one of a lithium metal reference electrode, an alloy reference electrode, a reference electrode coated with a polymeric material, and an in-situ lithium plated reference electrode of a battery.

9. 1. A system for determining parameters of a pulse heating battery, comprising: a positive and negative pulse heating device (100) electrically connected to a lithium ion battery at a reference electrode and used for positive and negative pulse heating of the lithium ion battery; an anode reference potential acquisition device (200) electrically connected to the lithium ion battery and used to acquire a reference potential of the anode of the lithium ion battery, the reference potential being a voltage difference between the anode of the lithium ion battery and the reference electrode; a judgment and processing device (300) electrically connected to the anode reference potential acquisition device (200) and each of the positive and negative pulse heating devices (100), and used for determining whether the reference potential of the anode is less than a threshold potential, and if the reference potential of the anode is less than the threshold potential, sending a signal to the positive and negative pulse heating devices (100) for adjusting the heating parameter until a first heating parameter becomes the same as an nth heating parameter and the reference potential of the anode is equal to or greater than the threshold potential, and recording the nth heating parameter.

10. 10. The system for determining parameters of battery pulse heating as described in claim 9, wherein the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the determining and processing device (300) determines that the reference potential of the anode is less than the threshold potential, the determining and processing device (300) sends a signal to the positive and negative pulse heating device (100) for adjustment of the first temperature value.

11. 10. The system for determining parameters of battery pulse heating as described in claim 9, wherein the first heating parameters include a first temperature value, a first amplitude value, a second time value, and a third time value, and when the determining and processing device (300) determines that the reference potential of the anode is less than the threshold potential, the determining and processing device (300) sends a signal to the positive and negative pulse heating devices (100) for adjustment of the first amplitude value.

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