WO2024050798A1

WO2024050798A1 - Memory effect elimination method and apparatus, and computer device and storage medium

Info

Publication number: WO2024050798A1
Application number: PCT/CN2022/117982
Authority: WO
Inventors: 王羽臻; 邓亚茜; 史东洋; 程志鹏; 金海族; 李白清; 梁金鼎
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2024-03-14

Abstract

A memory effect elimination method and apparatus, and a computer device, a storage medium and a computer program product. The method comprises: after receiving a confirmation signal for eliminating a memory effect of a target battery, a BMS of the target battery acquiring a discharge parameter of the target battery, and performing comparative analysis on the discharge parameter, which is acquired in real time, and a preset phase transition parameter condition; and when the discharge parameter meets the preset phase transition parameter condition, completing the elimination of the memory effect of the target battery. Thus, the problem of the battery capacity of a target battery rapidly decreasing due to a memory effect is alleviated.

Description

Memory effect elimination method, device, computer equipment and storage medium

Technical field

The present application relates to the field of batteries, and specifically relates to a memory effect elimination method, device, computer equipment, storage medium and computer program product.

Background technique

With the development of science and technology and the proposal of energy conservation and emission reduction, electric vehicles are increasingly used in people's daily lives due to their advantages of energy conservation and environmental protection. For electric transportation, battery technology is an important factor related to its development.

However, during the use of the battery, the problem of reversible capacity failure occurs due to not being fully charged or fully discharged for a long time, that is, the memory effect occurs. The existence of the memory effect will cause the battery capacity to rapidly decay.

Contents of the invention

In view of the above problems, the present application provides a memory effect elimination method, device, computer equipment, storage medium and computer program product, which can alleviate the problem of rapid battery capacity decay caused by the memory effect.

In the first aspect, this application provides a memory effect elimination method, which includes: when receiving a confirmation signal to eliminate the memory effect, obtaining the discharge parameters during the discharge process of the target battery; when the discharge parameters meet the preset phase transition parameter conditions, It is determined that the target battery has completed memory effect elimination; wherein, phase transition refers to the transformation of the battery material from a crystalline phase to an amorphous phase during the discharge process.

According to the above memory effect elimination method, after the BMS of the target battery receives the confirmation signal to eliminate the memory effect, the discharge parameters of the target battery will be obtained, and the discharge parameters obtained in real time will be compared and analyzed with the preset phase transition parameter conditions. When the discharge parameters meet the preset phase transition parameter conditions, the memory effect on the target battery is eliminated. This solution can eliminate the memory effect of the target battery by discharging the target battery so that the discharge parameters meet the preset phase transition parameter conditions, thereby alleviating the problem of rapid attenuation of the battery capacity of the target battery due to the memory effect.

In some embodiments, the discharge parameter includes a negative electrode discharge voltage, and when the discharge parameter meets a preset phase transition parameter condition, determining that the target battery has completed memory effect elimination includes: when the negative electrode discharge voltage is greater than or Equal to the preset negative phase transition voltage, it is determined that the target battery has completed the memory effect elimination.

This solution uses the negative electrode discharge voltage of the target battery and the corresponding preset negative electrode phase transition voltage to eliminate the memory effect of the target battery. The negative electrode discharge voltage is obtained quickly, which can effectively improve the memory effect elimination efficiency.

In some embodiments, the preset negative electrode phase transition voltage is determined based on the negative electrode phase transition potential interval of the same type of battery as the target battery.

This solution combines the battery with the same type as the target battery and the negative electrode phase transition potential range when phase transition occurs to obtain the preset negative electrode phase transition voltage required by the target battery, ensuring the accuracy of the preset negative electrode phase transition voltage, thereby improving Memory effects eliminate accuracy.

In some embodiments, the discharge parameters include full battery discharge parameters, and when the discharge parameters meet preset phase transition parameter conditions, determining that the target battery has completed memory effect elimination includes: when the full battery discharge parameters If it is less than or equal to the preset full battery phase transition parameter, it is determined that the target battery has completed memory effect elimination.

This solution uses the full battery discharge of the target battery and the corresponding preset full battery phase transition parameter conditions to eliminate the memory effect of the target battery, which has the advantage of high accuracy in eliminating the memory effect.

In some embodiments, the full battery discharge parameter includes a full battery discharge voltage, the preset full battery phase transition parameter includes a preset full battery phase transition voltage, and when the full battery discharge parameter is less than or equal to the preset The full battery phase transition parameter determines that the target battery has completed memory effect elimination, including: when the full battery discharge voltage is less than or equal to the preset full battery phase transition voltage, determines that the target battery has completed memory effect elimination.

This solution uses the full battery discharge voltage and the corresponding preset full battery phase transition voltage to eliminate the memory effect of the target battery, which has the advantages of high accuracy and high elimination efficiency.

In some embodiments, the method for determining the preset full-battery phase transition voltage includes any one of the following: First, based on the negative electrode phase transition potential interval of the same type of battery as the target battery, the same type of battery is determined. The battery is tested with a reference electrode to obtain the full battery phase transition potential interval, and the preset full battery phase transition voltage is determined based on the full battery phase transition potential interval; the second item is based on the phase transition voltage of the same type of battery as the target battery. The relationship between the negative electrode silicon content parameter and the preset silicon content parameter and the full cell phase transition potential interval is matched to obtain the corresponding full cell phase transition potential interval, and the preset is determined based on the corresponding full cell phase transition potential interval. Full cell phase transition voltage.

This solution can obtain the preset full-cell phase transition voltage suitable for the current target battery through reference electrode testing or negative electrode silicon content parameter matching. The obtained preset full-cell phase transition voltage has high accuracy and further improves memory effect elimination. reliability.

In some embodiments, the full battery discharge parameter includes a state of charge parameter, the preset full battery phase transition parameter includes a preset full battery phase transition charging parameter, and when the full battery discharge parameter is less than or equal to Presetting the full-battery phase transition parameter to determine that the target battery has completed memory effect elimination includes: when the state-of-charge parameter is less than or equal to the preset full-battery phase transition charging parameter, determining that the target battery has completed memory effect elimination.

This solution specifically uses the state-of-charge parameters of the target battery during the discharge process and the corresponding preset full-battery phase transition charging parameters to combine the memory effect with the state-of-charge to detect whether the memory effect elimination is completed, which can further Improve the accuracy of memory effect removal.

In some embodiments, the confirmation method of the preset full battery phase transition charging parameters includes: calculating based on the negative electrode silicon content parameters of the same type of battery as the target battery and the preset phase transition charging parameter calculation model. The preset full battery phase transition charging parameters are obtained.

This solution uses a preset phase transition charging parameter calculation model to calculate the preset full battery phase transition charging parameters, thereby obtaining accurate preset full battery phase transition charging parameters, which can effectively improve the accuracy of memory effect elimination.

In some embodiments, before receiving the confirmation signal for eliminating the memory effect and obtaining the discharge parameters during the discharge process of the target battery, the method further includes: performing a trigger analysis on the target battery to eliminate the memory effect, and determining whether the target battery meets the requirements. Trigger conditions for memory effect erasure.

This solution performs trigger analysis on the target battery so that when the target battery meets the trigger conditions for memory effect elimination, the corresponding action can be executed in time, thereby improving the operational reliability of memory effect elimination.

In some embodiments, before receiving the confirmation signal for eliminating the memory effect and obtaining the discharge parameters during the discharge process of the target battery, the method further includes: pushing the elimination plan to the user terminal when the target battery meets the trigger condition.

This solution can also push the elimination plan to the user terminal when the trigger conditions are met. The user only needs to perform corresponding operations according to the pushed elimination plan, which effectively improves the convenience of elimination of memory effect elimination.

In some embodiments, before receiving the confirmation signal for eliminating the memory effect and obtaining the discharge parameters during the discharge of the target battery, the method further includes: obtaining the expected elimination time of the memory effect elimination, and pushing the expected elimination time to User terminal.

This solution can also provide feedback to the user about the expected elimination time when the memory effect is eliminated, so that the user can decide whether to turn on the memory effect elimination based on actual needs.

In some embodiments, when the confirmation signal for eliminating the memory effect is received and before obtaining the discharge parameters during the discharge process of the target battery, the method further includes: balancing the charge of each cell in the target battery.

This solution, before discharging the target battery to eliminate the memory effect, will also balance the power of each cell in the target battery to ensure that each cell is discharged with the same power during discharge to avoid damage to the cell and is effective Improved operational reliability of memory effect elimination.

In some embodiments, the target battery meets the triggering conditions for memory effect elimination, including: the operating parameters of the target battery meet preset parameter conditions, and the historical discharge parameters of the target battery do not meet the preset phase transition. The cumulative number of charge and discharge cycles of the parameter condition is greater than or equal to the first preset number of times.

This solution analyzes the operating parameters and historical discharge parameters of the target battery at the same time. When the operating parameters meet the preset parameter conditions and the historical discharge parameters do not meet the preset phase transition parameter conditions, the memory effect on the target battery is enabled. Elimination, to a certain extent, avoids false triggering of memory effect elimination, and has the advantage of strong trigger reliability.

In some embodiments, the operating parameters of the target battery meet preset parameter conditions, including any one of the following: the first item, the declining speed of the health state of the target battery is greater than or equal to the preset speed threshold; the second item , the increase in the decline speed of the health state of the target battery is greater than or equal to the preset speed increase threshold; the third item, in the last charge and discharge cycle after the target battery completed the memory effect elimination, the historical charging parameters meet the preset trigger The number of cycles of the parameter condition is greater than or equal to the second preset number of times; the fourth item is that the health state of the target battery is less than the estimated health state corresponding to the current moment; the fifth item is that the running time of the target battery is greater than or equal to the preset number of times. Assume the running time; the sixth item is receiving the memory effect elimination instruction.

This solution sets a variety of different operating parameters to detect the preset parameter conditions. In actual operation, as long as any one of them is met, the operating parameters will be considered to meet the preset parameter conditions, so that subsequent elimination operations can be performed to ensure timely Eliminate the memory effect on the target battery to improve the reliability of memory effect elimination.

In some embodiments, the historical charging parameters meet the preset trigger parameter conditions, including at least one of the following: first, the historical negative electrode charging voltage is less than the preset negative electrode trigger voltage; second, the historical full battery charging voltage is greater than the preset negative electrode trigger voltage. Assume the full battery trigger voltage; the third item, the historical state of charge parameter is greater than the preset full battery trigger charge parameter.

This solution combines the historical negative charging voltage, historical full battery charging voltage or historical state-of-charge parameters corresponding to the historical charging time to analyze whether the historical charging parameters meet the preset trigger conditions, thereby achieving trigger analysis of the memory effect, no matter which parameter satisfies the conditions, it can be considered that the historical charging parameters meet the preset trigger parameter conditions, effectively improving the reliability of trigger analysis for memory effect elimination.

In some embodiments, the memory effect elimination method includes any one of the following: First, the acquisition method of the preset negative electrode trigger voltage includes: analyzing according to the negative electrode memory effect trigger potential interval of the battery of the same type as the target battery. Obtain the preset negative electrode trigger voltage; second item, the acquisition method of the preset full battery trigger voltage includes: performing a reference electrode test according to the negative electrode memory effect trigger potential interval of the same type of battery as the target battery, and obtain The full battery memory effect trigger potential interval; and obtain the preset full battery trigger voltage according to the full battery memory effect trigger potential interval; third item, the acquisition method of the preset full battery trigger charging parameter includes: according to the The negative electrode memory effect triggering potential range of the same type of target battery is tested with the reference electrode to obtain the full battery memory effect triggering charging parameter range; and the preset full battery triggering charge is obtained based on the full battery memory effect triggering charging parameter range. Electrical parameters.

This solution analyzes and obtains the preset negative trigger voltage based on the negative electrode memory effect trigger potential range of the same type of battery as the target battery. It can also be combined with the negative electrode memory effect trigger potential range for reference electrode testing to obtain the preset full battery trigger voltage and Preset full battery trigger charging parameters to ensure the accuracy of the preset parameters and further improve the triggering reliability of memory effect elimination.

In some embodiments, when receiving the confirmation signal for eliminating the memory effect, before obtaining the discharge parameters during the discharge process of the target battery, the method further includes: based on the historical discharge parameters of the target battery not meeting the preset phase transition parameters. The cumulative number of charge and discharge cycles under the condition determines the memory effect level.

This solution can also be combined with the cumulative number of charge and discharge cycles when the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions during the actual trigger analysis process to match different memory effect levels for the target battery so as to achieve different memory effect intensities. distinguish.

In some embodiments, before receiving the confirmation signal for eliminating the memory effect, before obtaining the discharge parameters during the discharge of the target battery, the method further includes: according to the memory effect level, the preset memory effect level and the memory effect elimination. According to the corresponding relationship between the strategies, the current corresponding memory effect elimination strategy is pushed to the user terminal.

This solution, combined with the memory effect level, matches the corresponding memory effect elimination strategy for the target battery, and pushes the memory effect elimination strategy to the user terminal, so as to guide the user to determine whether to perform memory effect elimination according to the memory effect elimination strategy, and when to perform memory effect elimination. Effect elimination operation effectively improves the convenience of memory effect elimination.

In a second aspect, this application provides a memory effect elimination device, including: a discharge parameter acquisition module, which obtains the discharge parameters during the discharge process of the target battery when receiving a confirmation signal for eliminating the memory effect; and an elimination analysis module, which is used when the memory effect elimination confirmation signal is received. If the discharge parameters meet the preset phase transition parameter conditions, it is determined that the target battery has completed memory effect elimination; wherein phase transition refers to the transformation of the battery material from a crystalline phase to an amorphous phase during the discharge process.

In a third aspect, the present application provides a computer device, including a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of the above memory effect elimination method are implemented.

In a fourth aspect, the present application provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the above memory effect elimination method are implemented.

In a fifth aspect, the present application provides a computer program product, including a computer program that implements the steps of the above memory effect elimination method when executed by a processor.

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical means of the present application, they can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable. , the specific implementation methods of the present application are specifically listed below.

Description of the drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be construed as limiting the application. Also, the same parts are represented by the same reference numerals throughout the drawings. In the attached picture:

Figure 1 is a schematic diagram of battery capacity fading in some embodiments of the present application;

Figure 2 is a schematic diagram of application scenarios of the memory effect elimination method in some embodiments of the present application;

Figure 3 is a schematic flow chart of a memory effect elimination method according to some embodiments of the present application;

Figure 4 is a schematic flow chart of a memory effect elimination method according to other embodiments of the present application;

Figure 5 is a schematic flow chart of a method for eliminating memory effects in some embodiments of the present application;

Figure 6 is a schematic flow chart of a method for eliminating memory effects in some embodiments of the present application;

Figure 7 is a schematic flow chart of a memory effect elimination method according to other embodiments of the present application;

Figure 8 is a schematic flow chart of a method for eliminating memory effects in some embodiments of the present application;

Figure 9 is a schematic flow chart of a method for eliminating memory effects in some embodiments of the present application;

Figure 10 is a schematic flow chart of a memory effect elimination method according to other embodiments of the present application;

Figure 11 is a schematic flow chart of a method for eliminating memory effects in some embodiments of the present application;

Figure 12 is a schematic flow chart of a method for eliminating memory effects in some embodiments of the present application;

Figure 13 is a schematic flow chart of a memory effect elimination method according to other embodiments of the present application;

Figure 14 is a schematic diagram of battery capacity fading recovery according to other embodiments of the present application;

Figure 15 is a schematic structural diagram of a memory effect elimination device according to some embodiments of the present application;

Figure 16 is a schematic structural diagram of a memory effect elimination device according to other embodiments of the present application;

Figure 17 is a schematic structural diagram of a memory effect elimination device according to some further embodiments of the present application;

Figure 18 is a schematic structural diagram of a memory effect elimination device according to some further embodiments of the present application;

Figure 19 is a schematic structural diagram of a memory effect elimination device according to other embodiments of the present application;

Figure 20 is a schematic diagram of the internal structure of a computer device according to some embodiments of the present application.

Detailed ways

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

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Sequence or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to It is more than two pieces (including two pieces).

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

It is generally believed that the memory effect of the battery refers to the reversible capacity failure problem caused by the battery not being fully charged or discharged for a long time. It is generally believed that the memory effect mostly occurs in nickel-cadmium batteries, less in nickel-metal hydride batteries, and does not occur in lithium batteries. However, the inventor of the present application noticed that with people's pursuit of higher battery energy density, the pure graphite negative electrode with a specific capacity of 372mAh/g (milliamp hours/gram) can no longer fully meet the demand, and has a high specific capacity of 3579mAh/g. Silicon with specific capacity has become a new generation of lithium battery anode material. Unlike pure graphite anodes, lithium batteries containing silicon anodes also have a memory effect.

For example, please refer to Figure 1, which shows a lithium-ion battery with 15% silicon and 85% graphite as the negative electrode. The battery cycles between 10% SOC (State of Charge, state of charge) and 97% SOC. Capacity decay curve. It can be seen from the figure that when the lithium-ion battery has not been fully charged and fully discharged for 50 cycles, the battery capacity has attenuated by nearly 8%, and an obvious memory effect has occurred. This is a lithium-ion battery that has attenuated 20% as the end of battery life. For ion batteries, capacity fades very quickly. If the lithium-ion battery containing silicon negative electrode continues to be put into use after the memory effect occurs, it will eventually affect the performance of the electrical device where it is located due to capacity attenuation.

The inventor of the present application has discovered through research that after the memory effect occurs in a silicon anode lithium-ion battery, this type of battery can be discharged to eliminate the memory effect, so that the silicon anode lithium battery will decay due to the memory effect. Capacity restored. More specifically, in order to completely eliminate the memory effect of the silicon anode lithium battery, when discharging the silicon anode lithium battery, the discharge parameters of the silicon anode lithium battery need to meet certain parameter conditions.

In the process of eliminating the memory effect of silicon anode lithium batteries through discharge, according to the different discharge parameters of the silicon anode lithium batteries, the parameter conditions met by the silicon anode lithium batteries when completing the memory effect elimination will also be different. Through in-depth research, the inventor found that when the discharge parameter obtained during the discharge process is the negative electrode discharge voltage, the negative electrode discharge voltage needs to be greater than or equal to a certain voltage threshold in order to eliminate the memory effect of the silicon negative electrode lithium battery. This voltage threshold is within the negative electrode phase transition potential range corresponding to the negative electrode when the silicon negative electrode lithium battery undergoes a phase transition from a crystalline phase to an amorphous phase. Therefore, in a more detailed embodiment, whether the memory effect elimination is completed can be determined by analyzing whether the negative electrode discharge voltage is greater than or equal to the preset negative electrode phase transition voltage during the discharge process of the silicon negative electrode lithium battery.

When the discharge parameter obtained during the discharge process is the full battery discharge voltage, as the discharge time increases, the full battery discharge voltage will gradually decrease. Finally, when the full battery discharge voltage is less than or equal to a certain voltage threshold, the silicon anode lithium battery The memory effect will be eliminated. Similarly, this voltage threshold is within the full battery phase transition potential range corresponding to the full battery phase transition when the silicon anode lithium battery undergoes a phase transition from a crystalline phase to an amorphous phase. Therefore, in a more detailed embodiment, whether the memory effect elimination is completed can be determined by analyzing whether the full battery discharge voltage is less than or equal to the preset full battery phase transition voltage during the discharge process of the silicon negative electrode lithium battery.

When the discharge parameters obtained during the discharge process are state-of-charge parameters, as the discharge time increases, the state-of-charge parameters will gradually decrease. Finally, when the state-of-charge parameter is less than or equal to a certain charge parameter threshold, the silicon anode The memory effect of lithium batteries will be eliminated. Similarly, the charging parameter threshold is within the corresponding full battery phase transition charging parameter range when the silicon anode lithium battery undergoes a phase transition from a crystalline phase to an amorphous phase. Therefore, in a more detailed embodiment, whether the memory effect elimination is completed can be determined by analyzing whether the state-of-charge parameter is less than or equal to the phase transition charging parameter of the full battery during the discharge process of the silicon negative electrode lithium battery.

The memory effect elimination method provided by the embodiments of the present application can be applied to, but is not limited to, silicon anode lithium-ion batteries, and can also be used in other batteries containing silicon anodes. Moreover, the batteries provided by the embodiments of the present application can be used in, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft and other electrical devices. In order to facilitate understanding of the technical solution of the present application, in a more detailed embodiment, the target battery referred to in each of the following embodiments can be understood as a silicon anode lithium battery used in electric vehicles.

The memory effect elimination method provided by this application can be applied to the application environment shown in Figure 2, in which the BMS 202 (Battery Management System, battery management system) of the battery is communicated with the user terminal 204, and the target battery is detected in the BMS 202 After the triggering conditions for memory effect elimination are met, relevant prompt information will be returned to the user through the user terminal 204. The user can select the corresponding elimination plan through the user terminal 204, and finally move the target battery to the position corresponding to the elimination device, and remove the target battery. The memory effect is eliminated and its capacity is restored.

The specific type of the user terminal 204 is not unique. It can be a host computer connected to the BMS 202 for communication, or it can be a terminal device such as a mobile phone or wearable device that is convenient for the user to carry. The specific type is not limited. The specific type of elimination device used to eliminate the memory effect of batteries is not unique. The elimination device will also differ depending on the elimination scheme selected by the user. For example, in one embodiment, when the user selects charging self-elimination, that is, during the process of charging the target battery, the memory effect of the target battery is automatically eliminated. At this time, a charging pile can be used (specifically, a charging pile with a charge and discharge function can be used) The BMS 202 of the target battery can eliminate the memory effect during the process of the elimination device discharging the target battery. In another embodiment, when the user chooses to go to a specific elimination location (such as an after-sales service point designated by the battery manufacturer, or an after-sales service point corresponding to the electrical device using the target battery, etc.), for example, a dedicated discharge The device serves as an elimination device to discharge the target battery, and the BMS 202 of the target battery realizes memory effect elimination during the process of the elimination device discharging the target battery.

Referring to FIG. 3 , in some embodiments, the memory effect elimination method is applied to the BMS of the target battery as an example for explanation. The memory effect elimination method includes step 302 and step 304 .

Step 302: When receiving the confirmation signal for eliminating the memory effect, obtain the discharge parameters of the target battery during the discharge process.

Specifically, the target battery is the battery that needs to be eliminated by memory effect after analysis. The confirmation signal for eliminating the memory effect is the confirmation signal confirming the processing related to eliminating the memory effect on the target battery. The discharge parameters are the relevant parameters obtained by the BMS by collecting parameters of the target battery during the discharge process of the target battery. According to the technical solution of this application, after the BMS of the target battery receives the confirmation signal for eliminating the memory effect, it will perform the memory effect elimination operation on the target battery, and first collect and extract the discharge parameters of the target battery during the discharge process.

The method of receiving the confirmation signal to eliminate the memory effect is not unique. In one embodiment, the confirmation signal to eliminate the memory effect can be sent by the user to the BMS of the target battery through the user terminal, and then received by the BMS of the target battery. In another embodiment, the confirmation signal for eliminating the memory effect may also be that after the target battery is connected to the elimination device for eliminating the memory effect, the BMS of the target battery receives the confirmation signal for eliminating the memory effect sent by the elimination device. For example, in one embodiment, after the target battery is connected to a charging pile with charging and discharging functions, a confirmation signal to eliminate the memory effect is sent to the BMS of the target battery through the charging pile. Further, in one embodiment, the confirmation signal for eliminating the memory effect can also be generated by the BMS of the target battery when it detects that the BMS of the target battery needs to eliminate the memory effect. At this time, it can also be expressed as BMS reception. Confirming signal for elimination of memory effects.

Step 304: When the discharge parameters meet the preset phase transition parameter conditions, it is determined that the target battery has completed memory effect elimination.

Specifically, phase transition refers to the transformation of battery materials from a crystalline phase to an amorphous phase during the discharge process. The preset phase transition parameter conditions are the preset conditions that the corresponding discharge parameters satisfy when the battery material undergoes phase transition during the discharge process of the target battery. It can be understood that the preset phase transition parameter conditions can be obtained when the target battery leaves the factory by analyzing the same type of battery as the target battery, and then stored in the BMS of the target battery as the preset phase of the target battery. Change the parameter conditions and call it directly when there is a need for use later.

It can be understood that the way to obtain the phase transition parameter conditions by analyzing batteries of the same type as the target battery is not unique. In one embodiment, it can be based on experience and combining the active material types and contents of the same type of batteries to obtain Corresponds to the phase transition parameter conditions that need to be met, and is stored in the BMS of the target battery. In another embodiment, the actual discharge test can also be performed on the same type of battery, and the phase transition parameter conditions that need to be satisfied are finally obtained, and then pre-stored in the BMS of the target battery.

It should be noted that in one embodiment, when the BMS of the target battery detects that the target battery meets the preset phase transition parameter conditions, it will further output a discharge interruption prompt message, and remind the user to manually transfer the target to the battery through the discharge interruption prompt information. The discharge of the battery is interrupted; or the discharge interruption prompt message reminds the elimination device to interrupt the discharge operation of the target battery to avoid over-discharging of the target battery due to continued discharge and damage to the target battery.

At the same time, the technical solution of this application does not need to fully discharge the target battery when eliminating the memory effect. It only needs to discharge the target battery until it meets the preset phase transition parameter conditions, and the memory effect elimination operation can be completed and the target battery can be restored. The actual capacity will basically not affect the life and performance of the target battery.

Referring to FIG. 4 , in some embodiments, the discharge parameter includes a negative electrode discharge voltage, and step 304 includes step 402 .

Step 402: When the negative electrode discharge voltage is greater than or equal to the preset negative electrode phase transition voltage, it is determined that the target battery has completed memory effect elimination.

Specifically, the negative electrode discharge voltage is the voltage value obtained by collecting the voltage of the negative electrode of the target battery during the discharge process of the target battery. The preset negative electrode phase transition voltage is the voltage corresponding to the negative electrode of the target battery when the phase transition occurs in the target battery. According to the solution of this embodiment, during the process of discharging the target battery to eliminate the memory effect, the negative electrode discharge voltage is used as the discharge parameter of the target battery to detect whether the memory effect elimination is completed. Correspondingly, the preset negative electrode phase transition voltage is used as the preset phase transition parameter condition. When the negative electrode discharge voltage is greater than or equal to the preset negative electrode phase transition voltage, the target battery is considered to meet the preset phase transition parameter conditions, that is, the target battery Completed memory effect elimination. Correspondingly, if the negative electrode discharge voltage obtained during the discharge process is less than the preset negative electrode phase transition voltage, it is considered that the target battery has not completed the memory effect elimination.

It should be noted that the way to determine the preset negative electrode phase transition voltage is not unique. In a more detailed embodiment, the preset negative electrode phase transition voltage is determined based on the negative electrode phase transition potential interval of the same type of battery as the target battery.

Specifically, a battery of the same type as the target battery refers to a battery whose materials and contents are consistent in all parts of the battery. During the actual operation of the battery, for the same type of battery, when a phase transition occurs, the corresponding voltages are basically the same. The negative electrode phase transition potential interval is the voltage interval range obtained by collecting the negative electrode discharge voltage when the phase transition occurs for the same type of battery as the target battery. The preset negative electrode phase transition voltage is determined according to the negative electrode phase transition potential interval, that is, according to the actual situation of the battery, a voltage within the negative electrode phase transition potential interval is selected as the preset negative electrode phase transition voltage. In particular, in a more detailed embodiment, the upper limit voltage value of the negative electrode phase transition potential interval can be selected as the preset negative electrode phase transition voltage.

The specific size of the negative electrode phase transition potential interval is not unique. In one embodiment, taking the target battery as a silicon anode battery as an example, when the crystalline phase to amorphous phase transition occurs, the negative electrode phase transition potential interval is about 430 mV (mV). ) to 470mV, therefore, the preset negative phase transition voltage can be selected in the range of 430mV-470mV, for example, 430mV or 470mV can be selected.

Furthermore, in another embodiment, considering the differences between different silicon materials, the negative electrode phase transition potential range can be further expanded on the basis of 430 mV to 470 mV. For example, the negative electrode phase transition potential range is expanded to 400mV to 500mV. Correspondingly, this embodiment presets that the negative phase transition voltage can be selected within the range of 400mV to 500mV.

It can be understood that in other embodiments, the negative electrode phase transition potential range can be further reduced on the basis of 430 mV to 470 mV. For example, the negative electrode phase transition potential range is reduced to 440mV to 460mV. Correspondingly, this embodiment presupposes that the negative electrode phase transition voltage can be selected within the range of 440mV to 460mV.

Referring to FIG. 5 , in some embodiments, the discharge parameters include full battery discharge parameters, and step 304 includes step 502 .

Step 502: When the full battery discharge parameter is less than or equal to the preset full battery phase transition parameter, it is determined that the target battery has completed memory effect elimination.

Specifically, the full battery discharge parameters refer to the discharge parameters displayed by the target battery as a whole during the discharge process of the target battery. The preset full-battery phase transition parameters are the external parameters of the target battery as a whole when a phase transition occurs in the target battery. According to the solution of this embodiment, during the process of discharging the target battery to eliminate the memory effect, the full battery discharge parameters are used as the discharge parameters of the target battery to detect whether the memory effect elimination is completed. Correspondingly, the preset full battery phase transition parameter is used as the preset phase transition parameter condition. When the full battery discharge parameter is less than or equal to the preset full battery phase transition parameter, the target battery is considered to meet the preset phase transition parameter condition, also That is, the target battery has completed the memory effect elimination. Correspondingly, if the full battery discharge parameter is greater than the preset phase transition parameter, it is considered that the target battery has not completed the memory effect elimination.

This solution uses the full battery discharge of the target battery and the corresponding preset full battery phase transition parameter conditions to eliminate the memory of the target battery, which has the advantage of high accuracy in eliminating the memory effect.

Further, please refer to FIG. 6 . In some embodiments, the full battery discharge parameter includes a full battery discharge voltage, and the preset full battery phase transition parameter includes a preset full battery phase transition voltage. Step 502 includes step 602 .

Step 602: When the full battery discharge voltage is less than or equal to the preset full battery phase transition voltage, it is determined that the target battery has completed memory effect elimination.

Specifically, the full battery discharge voltage is the voltage between the positive electrode and the negative electrode of the target battery during the discharge process of the target battery. The preset full battery phase transition voltage is the voltage between the positive and negative electrodes of the target battery when the phase transition occurs in the target battery. According to the solution of this embodiment, during the process of discharging the target battery to eliminate the memory effect, the full battery discharge voltage is used as the discharge parameter of the target battery to detect whether the memory effect elimination is completed. Correspondingly, the preset full battery conversion voltage is used as the preset phase change parameter condition. When the full battery discharge voltage is less than or equal to the preset full battery phase change voltage, the target battery is considered to meet the preset phase change parameter condition, that is, Target battery completes memory effect removal. Correspondingly, if the obtained full battery discharge voltage is greater than the preset full battery phase transition voltage, it is considered that the target battery has not completed memory effect elimination.

It can be understood that the method of obtaining the preset full-battery discharge voltage is not unique. In some embodiments, the method of determining the preset full-battery phase transition voltage includes any of the following:

The first item is to conduct a reference electrode test on the same type of battery based on the negative electrode phase transition potential interval of the same type of battery as the target battery to obtain the full battery phase transition potential interval, and determine the preset full battery phase based on the full battery phase transition potential interval. conversion voltage.

The second item is based on the negative electrode silicon content parameters of the same type of battery as the target battery and the relationship between the preset silicon content parameters and the full battery phase transition potential interval. The corresponding full battery phase transition potential interval is obtained by matching, and based on the corresponding full battery phase transition potential interval. The battery phase transition potential interval determines the preset full battery phase transition voltage.

Specifically, the full battery phase transition potential interval is the voltage change interval between the positive electrode and the negative electrode of the target battery during the entire phase transition process of the target battery. As shown in the above embodiment, the negative electrode phase transition potential interval can be determined according to the battery material of the target battery. After knowing the negative electrode phase transition potential interval of the same type of battery as the target battery, the same type of battery can be discharged to achieve further testing. , when the negative electrode discharge voltage is read through the reference electrode and reaches the negative electrode phase transition potential range, the corresponding voltage range can be used as the full battery phase transition potential range of the same type of battery. Afterwards, further selection is made within the full-cell phase transition potential interval obtained by testing, and the full-cell phase transition voltage corresponding to the target battery can be obtained and stored in the BMS of the target battery.

The method of reference electrode testing is not the only one. In a more detailed embodiment, the occurrence of crystalline phase-amorphous phase in a silicon negative electrode lithium battery is used as an example for explanation. During the discharge process of a battery of the same type as the target battery, the negative electrode discharge voltage and the discharge voltage at the reference electrode are collected simultaneously. When it is detected that the negative electrode discharge voltage reaches the boundary of the negative electrode phase transition potential interval, the corresponding parameters are recorded. Compare the discharge voltage at the electrode until the electrode discharge voltage reaches the other boundary of the negative electrode phase transition potential interval. Finally, the recorded voltage interval is used as the full battery phase transition potential interval and is stored in the target battery to obtain the target battery. The whole cell phase transition potential range.

Correspondingly, at this time: φ=f(T1, T2, I, SOC0), where φ is the discharge voltage at the reference electrode, T1 is the test environment temperature, T2 is the test battery temperature, I is the test current, SOC0 The initial SOC of the battery test, that is, the discharge voltage at the reference electrode is related to the test environment temperature, test battery temperature, test current and the initial SOC of the test.

The negative electrode silicon content parameter is the mass ratio of the doped silicon mass to the total active material of the negative electrode in the negative electrode of the target battery. Since the voltage range of the crystalline phase-amorphous phase transition is directly related to the negative electrode silicon content parameter, the solution of this embodiment directly uses the negative electrode silicon content parameter of the same type of battery, combined with the preset silicon content parameter and the full battery phase transition potential range. The relationship is matched to obtain the full-cell phase transition potential interval, and further selection is made within the full-cell phase transition potential interval, and finally the preset full-cell phase transition voltage is obtained and stored in the BMS of the target battery. In particular, in a more detailed embodiment, the lower limit voltage value of the full battery phase transition potential interval can be selected as the preset full battery phase transition voltage.

It should be noted that the relationship between the preset silicon content parameters and the phase transition potential range of the full battery can be stored in the form of a database or a chart. There is no specific limit and the selection can be based on actual usage scenarios. For example, in a more detailed embodiment, the relationship between the silicon content parameter and the phase transition potential interval of the full cell can be shown in the following table:

Further, in a more detailed embodiment, taking a nickel-cobalt-manganese ternary cathode material and a battery with a graphite-doped negative electrode material containing x% silicon as an example, the full cell phase transition potential range of the battery is related to the negative electrode silicon content parameter As shown in the following table:

硅含量参数/％Silicon content parameter/%	全电池相转变电压区间/VFull battery phase transition voltage range/V
5％5%	2.8～3.12.8～3.1
15％15%	3.1～3.23.1～3.2
25％25%	3.1～3.33.1～3.3

Correspondingly, taking the 5% silicon content parameter as an example, the preset full-cell phase transition voltage of the target battery can be set to any value between 2.8V and 3.1V. In particular, in one embodiment, the preset full-cell phase transition voltage may be set to 2.8V.

Referring to FIG. 7 , in some embodiments, the full-battery discharge parameters include state-of-charge parameters, and the preset full-battery phase transition parameters include preset full-battery phase transition charging parameters. Step 502 includes step 702 .

Step 702: When the state of charge parameter is less than or equal to the preset full battery phase transition charging parameter, it is determined that the target battery has completed memory effect elimination.

Specifically, the state of charge parameter (SOC, State of Charge), also known as the state of charge, refers to the ratio of the remaining capacity of the battery to the battery capacity. The preset full battery phase transition charging parameter is the change range of the state of charge parameter of the target battery when the phase transition occurs in the target battery. According to the solution of this embodiment, during the process of discharging the target battery to eliminate the memory effect, the state-of-charge parameters of the full battery discharge are used as the discharge parameters of the target battery to detect whether the memory effect elimination is completed. Correspondingly, the preset full battery phase transition charging parameter is used as the preset phase transition parameter condition. When the state of charge parameter is less than or equal to the preset full battery phase transition charging parameter, the target battery is considered to meet the preset phase transition. Parameter conditions, at this time BMS will consider that the target battery has completed the memory effect elimination. Correspondingly, if the obtained state-of-charge parameter is greater than the preset full-battery phase transition charge parameter, it is considered that the target battery has not completed memory effect elimination.

In some embodiments, the confirmation method of the preset full battery phase transition charging parameters includes: calculating the preset full battery based on the negative electrode silicon content parameters of the same type of battery as the target battery and the preset phase transition charging parameter calculation model. Battery phase transition charging parameters.

Specifically, the preset phase transition charging parameter calculation model represents the corresponding relationship between the full battery phase transition charging parameter range and the negative electrode silicon content parameter. In the solution of this embodiment, the negative electrode silicon content parameters of the same type of battery as the target battery are substituted into the preset phase transition charging parameter calculation model, and the full battery phase transition charging parameter range can be obtained. In the end, it is only necessary to select within the range of the full battery phase transition charging parameters to obtain the preset full battery phase transition charging parameters and store them in the BMS of the target battery.

It should be noted that the specific type of the preset phase change charging parameter calculation model is not unique. In a more detailed embodiment, the preset phase change charging parameter calculation model includes: SOCca≤x%+b, where , x% refers to the negative electrode silicon content parameter, b is the correction coefficient, ranging from 0.01-0.1, the specific value can be selected based on actual needs, and SOCca is the phase transition charging parameter range of the full battery. For example, in one embodiment, the silicon content parameter of the negative electrode is 5%, and the value of the correction parameter b is 0.05, corresponding to SOCca≤10% at this time. The preset full battery phase transition charging parameter can be selected within a range of less than or equal to 10%, for example, 8% can be selected. Correspondingly, during the actual memory effect elimination process, if the BMS detects that the state-of-charge parameter of the target battery is less than or equal to 8%, it is considered that the target battery has completed the memory effect elimination at this time.

Referring to Figure 8, in some embodiments, before step 302, the method further includes step 802.

Step 802: Perform a memory effect elimination trigger analysis on the target battery to determine whether the target battery meets the memory effect elimination trigger conditions.

Specifically, the confirmation signal for eliminating the memory effect is received by the BMS of the target battery when the target battery meets the triggering condition for eliminating the memory effect. The specific receiving method is not unique. It can be sent to the BMS of the target battery through the user terminal, it can be sent to the BMS of the target battery through the elimination device that charges and discharges the target battery, or the BMS of the target battery can be sent to the BMS of the target battery. When the detection meets the trigger conditions, it is automatically generated to achieve automatic elimination of memory effects.

Trigger analysis is the analysis of detecting whether the target battery triggers memory effect elimination, which is specifically achieved by detecting whether the target battery meets the trigger conditions. Depending on the set trigger conditions, the corresponding trigger analysis operations will also be different. For example, if the trigger condition needs to be combined with the real-time operating status parameters of the target battery, the trigger analysis operation needs to be performed in real time; if the trigger condition only needs to be combined with the target battery operating status parameters under a specific condition, there is no need to perform trigger analysis in real time, only The trigger analysis operation needs to be executed only when the specific conditions are met.

Referring to Figure 9, in some embodiments, before step 302, the method further includes step 902.

Step 902: When the target battery meets the trigger condition, push the elimination plan to the user terminal.

Specifically, the elimination plan is the discharge plan selected to eliminate the memory effect by discharging the target battery. After the BMS detects that the target battery meets the trigger conditions for memory effect elimination, it will push the corresponding elimination plan to the user terminal based on the actual usage scenarios of the target battery. For example, it can be recommended that the user eliminate the memory effect independently when charging and discharging the target battery at a charging pile (with charging and discharging functions); or it can be recommended that the user take the target battery to an after-sales service point and have professionals assist in eliminating the memory effect. eliminate.

It can be understood that when the BMS pushes the memory effect elimination solution to the user terminal, in one embodiment, it may recommend a memory effect elimination solution to the user based on the actual usage scenario of the battery. In another embodiment, all optional memory effect elimination solutions may be pushed to the user terminal, and the user may decide which elimination solution to use for final memory effect elimination.

Regardless of the push method, after the user determines the appropriate elimination solution, the battery will be connected to the corresponding elimination device, and a confirmation signal to eliminate the memory effect will be fed back to the BMS through the user terminal or elimination device, or the BMS will detect After the trigger condition is met, a confirmation signal for eliminating the memory effect is automatically generated, so that the BMS starts to perform the corresponding memory effect elimination operation.

Referring to Figure 10, in some embodiments, step 302 is preceded by step 102.

Step 102: Obtain the estimated elimination time of memory effect elimination, and push the estimated elimination time to the user terminal.

Specifically, the estimated elimination time is the estimated time required from the start of discharge of the target battery to the completion of memory effect elimination. When the program eliminates the memory effect, it will also push the estimated elimination time required to eliminate the memory effect to the user terminal, so that the user can finally make a decision on whether to turn on the memory effect elimination based on the estimated elimination time and the elimination plan.

It should be noted that step 102 may be executed after step 902, before step 902, or simultaneously with step 902. The selection shall be made based on actual needs. In order to facilitate understanding of the technical solution of the present application, the following is Step 102 is executed after step 902, taking an example for explanation.

This embodiment takes the elimination scheme as an example of recommending users to use charging piles to eliminate memory effects. First, when the BMS detects that the target battery meets the trigger conditions for memory effect elimination, the BMS will push the charging pile discharge elimination plan to the user terminal. The specific push form is not unique. For example, in a more detailed embodiment, the BMS can push the inquiry information "whether to eliminate the memory effect before charging at the charging pile next time" to the user terminal, which means that the BMS sends a message to the user terminal. A memory effect elimination plan has been pushed. If the user feedbacks "yes" through the user terminal, it means that the BMS receives the elimination confirmation fed back by the user terminal according to the elimination plan, and the user agrees to eliminate the memory effect at the charging pile.

After that, the BMS starts to detect whether the target battery is connected to the charging pile. When it detects that the charging pile is connected, it estimates the memory effect elimination time of the target battery, obtains the estimated elimination time, and pushes it to the user terminal. If the user believes that the expected elimination time is within an acceptable range, a confirmation signal for eliminating the memory effect is returned to the BMS through the user terminal to obtain the discharge parameters of the target battery.

It can be understood that if the user believes that the expected elimination time is unreasonable, or other emergencies occur and there is no need to perform memory effect elimination, the user will return a memory effect elimination close signal through the user terminal to terminate the current memory effect elimination operation.

Correspondingly, in one embodiment, after the user returns a signal that the memory effect elimination is turned off, the memory effect elimination does not stop completely. Before the user charges through the charging pile next time, the estimated elimination time will be pushed to the user terminal again. It can be restarted to eliminate the memory effect before the next charge based on actual needs.

It can be understood that the method of obtaining the estimated elimination time is not unique. In a more detailed embodiment, the method of obtaining the estimated elimination time includes: obtaining the memory effect elimination according to the current state-of-charge parameters of the target battery and the preset elimination current. Estimated elimination time.

Specifically, the preset elimination current is the corresponding required discharge current when the target battery performs memory effect elimination. The method of obtaining the preset elimination current is not unique. In one embodiment, the preset elimination current can be set in the BMS of the target battery, and can be directly called when there is a need for elimination. In another embodiment, since the charge and discharge operations are implemented through the elimination device when the memory effect is eliminated on the target battery, the preset elimination current can be pre-stored in the elimination device. After the target battery is connected to the elimination device, the BMS Obtained by requesting the elimination device.

Referring to Figure 11, in some embodiments, before step 302, the method further includes step 112.

Step 112: Perform power balancing on each cell in the target battery.

Specifically, the target battery is often built with multiple cells connected in series and/or in parallel. During use, there is often a certain deviation in the power due to individual differences in the cells. Power balancing means charging and discharging so that the power difference of each cell in the target battery is within a certain threshold range. It can be understood that the technical solution of this application is mainly used for multi-cell type batteries. For single-cell batteries, there is no need to perform power balancing.

It should be noted that step 112 may be executed before step 902 or after step 902. Different selections may be made based on actual needs, which are not limited here.

This solution, before discharging the target battery to eliminate the memory effect, will also balance the power of each cell in the target battery to ensure that each cell is discharged with the same power during discharge to avoid damage to the cell and is effective Improved operational reliability of memory effect removal.

In some embodiments, the target battery meets the triggering conditions for memory effect elimination, including: the operating parameters of the target battery meet the preset parameter conditions, and the historical discharge parameters of the target battery do not meet the cumulative number of charge and discharge cycles that do not meet the preset phase transition parameter conditions. , greater than or equal to the first preset number of times.

Specifically, the operating parameters are the parameters corresponding to the target battery during normal charging and discharging operations, which may be the state parameters of the target battery itself, or the time parameters of the target battery operation, etc. When analyzing whether the triggering conditions for memory effect elimination are met in this scheme, the target battery needs to meet two conditions at the same time. One is that the operating parameters of the target battery meet the preset parameter conditions, and the other is that the historical discharge parameters of the target battery do not meet the preset parameter conditions. It is assumed that the cumulative number of charge and discharge cycles under the phase transition parameter condition reaches the first preset number.

During the operation of the target battery, the BMS of the target battery obtains the operating parameters of the target battery in real time, and compares and analyzes the operating parameters with the corresponding preset parameter conditions. At the same time, the BMS also analyzes the historical discharge parameters of each discharge cycle of the target battery. Collect and compare and analyze it with the corresponding preset phase transition parameter conditions. Only when the two judgment conditions are met at the same time, will the target battery be considered to need to be turned on to eliminate the memory effect.

It can be understood that the historical discharge parameters of the target battery are not unique. The historical discharge parameters will also be different depending on the operating status of the target battery. If the target battery has not undergone memory effect elimination before, the corresponding discharge parameters of the target battery before the current state will be used as historical discharge parameters. When the target battery has previously undergone memory effect elimination, the discharge parameters in the time period after the last memory effect elimination will be used as historical discharge parameters. That is to say, in the technical solution of this application, every time the target battery performs memory effect elimination, the corresponding historical parameters used for memory effect analysis will also be cleared, and the target battery will start the next round of memory effect elimination analysis operation.

It should be noted that the corresponding judgment methods will be different depending on the obtained historical discharge parameters and the preset phase transition parameter conditions. In one embodiment, the historical discharge parameters include historical negative electrode discharge voltage, historical full battery discharge voltage, and historical state-of-charge parameters. Correspondingly, it only needs to be detected that the historical negative electrode discharge voltage is less than the preset negative electrode phase transition voltage, the historical full battery discharge voltage is greater than the preset full battery phase transition voltage, or the historical state of charge parameter is greater than the preset full battery charge parameter. In all cases, the charge and discharge cycles in which the historical discharge parameters do not meet the preset phase transition parameter conditions will be accumulated by 1. When the accumulated number of times is greater than or equal to the first preset number of times, it can be determined whether to start memory effect elimination based on the relationship between the operating parameters and the preset parameter conditions.

In another embodiment, the historical discharge parameter may also include one of the historical negative electrode discharge voltage, the historical full battery discharge voltage, and the historical state of charge parameter. For example, the historical discharge parameter is the historical full battery discharge voltage. In actual operation, During the process, it is only necessary to count the number of charge and discharge cycles in which the historical full battery discharge voltage is greater than the preset full battery phase transition voltage. In other embodiments, the historical discharge parameters may also include any two combinations of historical negative electrode discharge voltage, historical full battery discharge voltage, and historical state-of-charge parameters, which can be selected based on actual needs.

It should be noted that the specific size of the first preset number of times is not unique, and its size will vary depending on the actual usage scenario of the target battery and the type of the target battery. For example, in a more detailed embodiment, the first preset number of times may be set to 1.

In some embodiments, the operating parameters of the target battery meet the preset parameter conditions, including any one of the following: the first item, the decline speed of the target battery's health state is greater than or equal to the preset speed threshold; the second item, the target battery's health status decline speed is greater than or equal to the preset speed threshold; The increase in the decline rate of the healthy state is greater than or equal to the preset speed increase threshold; the third item is that in the last charge and discharge cycle after the target battery completed the memory effect elimination, the number of cycles in which the historical charging parameters meet the preset trigger parameter conditions is greater than or equal to The second preset number of times; the fourth item, the health status of the target battery is less than the estimated health status corresponding to the current moment; the fifth item, the running time of the target battery is greater than or equal to the preset running time; the sixth item, the memory effect is received Eliminate instructions.

Specifically, the rate of decline of the health status of the target battery can be calculated based on the charging and discharging cycle, or based on the running time of the target battery. When statistics are based on charge and discharge cycles, the rate of decline of the health state is the amount of decline in the health state after one or more charge and discharge cycles. When statistics are based on the running time of the target battery, the decline rate of the health state is the amount of decline in the health state after one or more running time periods.

The increase in the decline speed of the health state is the increase in the decline speed of the two adjacent health states. Specifically, it is the difference between the current detected decline speed and the last detected decline speed, and the difference between the last detected decline speed and the current detected decline speed. The ratio of the falling speed to .

In order to facilitate understanding, in a more detailed embodiment, a charge and discharge cycle can be used as an example for explanation. The decline rate of the battery health state is (S1-S0)/1cycle, where S1 is the detected value of the current charge and discharge cycle. The health status of the target battery, S0 is the health status of the target battery detected in the previous charge and discharge cycle, and 1 cycle is one charge and discharge cycle. Correspondingly, in a more detailed embodiment, the preset speed threshold can be set to 0.2%/1cycle at this time.

For explanation, a running time cycle is 30 days. Correspondingly, the decline rate of battery health status is (S3-S2)/30 days, where S3 is the health status of the current target battery and S2 is the health status detected 30 days ago. The health status of the target battery. Correspondingly, in a more detailed embodiment, the preset speed threshold may be set to 2%/30 days at this time.

Correspondingly, in one embodiment, the decline rate increase of the battery's health state can also be counted based on the charge and discharge cycle, or based on the battery's operating time. For example, in a more detailed embodiment, the decrease speed increase is expressed as: (health state of the previous charge and discharge cycle - health state of the current charge and discharge cycle) / (health state of the previous two charge and discharge cycles - previous Health status during charge and discharge cycles) -100%. Or the increase in the decline rate can be expressed as: health status corresponding to 30 days ago - health status corresponding to the current situation)/(health status corresponding to 60 days ago - health status corresponding to 30 days ago) - 100%. The size of the preset speed increase threshold is not unique and can be selected differently based on actual scenarios. For example, in a more detailed embodiment, the preset speed increase threshold can be set to 50%.

The method of obtaining the estimated health status is not the only one. In a more detailed embodiment, the BMS is set with a battery health status decay curve. During normal use of the target battery, as the use time increases, the battery health status decays The curve can estimate the health status of the target battery at the current moment, that is, the estimated health status can be obtained. If the health status actually detected by the BMS at the current moment is lower than the estimated health status, it means that the health status of the target battery has declined abnormally at this time, which also indicates that the operating parameters meet the preset parameter conditions.

In another embodiment, the BMS can also time the running time of the target battery. After the BMS detects that the battery running time is greater than or equal to the preset running time, the BMS will also consider that the operating parameters meet the preset parameter conditions. It can be understood that the size of the preset running time is not unique. In a more detailed embodiment, the preset running time can be set to be greater than or equal to 6 months. In more detail, in one embodiment, the preset running time can be set to be greater than or equal to 12 months.

In one embodiment, the memory effect elimination instruction is specifically sent by the user through the user terminal. If the user has a memory effect elimination requirement for the target battery, the corresponding elimination operation can also be actively triggered. At this time, the user sends a memory effect elimination instruction to the BMS through the user terminal. After the BMS receives the memory effect elimination instruction from the user terminal, it is considered that the operating parameters at this time meet the preset parameter conditions.

In another embodiment, it is also possible to collect the historical charging parameters of each charge and discharge cycle after the target battery completes the last memory effect elimination, and analyze it in combination with the preset trigger parameter conditions. If the historical charging parameters satisfied by the analysis are If the number of cycles of the preset trigger parameter condition is greater than or equal to the second preset number, it is also considered that the operating parameters of the target battery meet the preset parameter condition. It can be understood that the size of the second preset number of times is not unique and can be selected based on the actual situation of the target battery. For example, in a more detailed embodiment, the second preset number of times may be set to 1.

This solution sets a variety of different operating parameters to detect the preset parameter conditions. In actual operation, as long as any one of them is met, the operating parameters will be considered to meet the preset parameter conditions, and subsequent elimination operations will be performed to ensure timely Eliminate the memory effect on the target battery to improve the reliability of memory effect elimination.

In some embodiments, the historical charging parameters meet the preset trigger parameter conditions, including at least one of the following: first, the historical negative electrode charging voltage is less than the preset negative electrode trigger voltage; second, the historical full battery charging voltage is greater than the preset full battery charging voltage. Battery trigger voltage; the third item, the historical state of charge parameter is greater than the preset full battery trigger charge parameter.

Specifically, the historical negative electrode charging voltage is the voltage value of the negative electrode of the target battery during charging in each charge and discharge cycle after the target battery last completed the memory effect elimination. The historical full battery charging voltage is the voltage value of the positive electrode relative to the negative electrode of the target battery during charging in each charging cycle after the target battery last completed the memory effect elimination. The historical state-of-charge parameters are the state-of-charge parameters of the target battery during charging in each charging cycle after the target battery last completed the memory effect elimination.

The solution of this embodiment triggers analysis based on the parameters corresponding to the charging process in each charge and discharge cycle after the target battery has completed the memory effect elimination last time. Similar to the above preset phase transition parameter conditions, the process is also divided into two situations: negative electrode triggering and full battery triggering. Negative electrode triggering requires analyzing the relationship between the negative electrode charging voltage and the preset negative electrode triggering voltage. When the historical negative electrode charging voltage is less than When the negative trigger voltage is preset, the historical charging parameters are considered to meet the preset trigger parameter conditions. Under the full battery trigger condition, it is specifically subdivided into two types. One is analyzed based on the full battery voltage during the charging process, and the other is analyzed based on the state of charge parameters during the charging process. Whether the historical full-battery charging voltage is greater than the preset full-battery trigger voltage, or the historical state-of-charge parameter is greater than the preset full-battery trigger charging parameter, it is considered that the historical charging parameters meet the preset trigger parameter conditions at this time.

In the actual operation process, the analysis of the above three preset trigger parameter conditions can be to set only one of them, a combination of any two, or three to be selected according to actual needs.

In some embodiments, the memory effect elimination method includes any one of the following: First, the method of obtaining the preset negative electrode trigger voltage includes: analyzing and obtaining the preset negative electrode based on the negative electrode memory effect trigger potential interval of the battery of the same type as the target battery. Trigger voltage; second item, the preset full-battery trigger voltage acquisition method includes: based on the negative electrode memory effect trigger potential interval of the same type of battery as the target battery, conduct a reference electrode test to obtain the full-cell memory effect trigger potential interval; and based on The preset full-battery trigger voltage is obtained from the full-battery memory effect trigger potential interval; the third item, the preset full-battery trigger charge parameter acquisition method includes: making a reference based on the negative electrode memory effect trigger potential interval of the same type of battery as the target battery. Through electrode testing, the full battery memory effect triggered charging parameter range is obtained; and based on the full battery memory effect triggered charging parameter range, the preset full battery triggered charging parameters are obtained.

Specifically, the negative electrode memory effect triggering potential range is the voltage range corresponding to the negative electrode when a phase transition occurs during the charging process of a battery of the same type as the target battery. The trigger potential range of the negative electrode memory effect varies according to the type of negative electrode material of the target battery. Taking lithium batteries with a negative electrode containing silicon, silicon oxide or silicon alloy as an example, the trigger potential range of the negative electrode memory effect is the amorphous state that occurs during the charging process. When the phase to crystal phase transitions, the voltage range corresponding to the negative electrode is generally 40mV-60mV. The negative electrode memory effect trigger potential range can be directly set to 40mV-60mV.

It can be understood that in other embodiments, taking into account the differences between different silicon materials, the range can be appropriately expanded or reduced to obtain the final negative electrode memory effect trigger potential range, which can be expanded to 20mV-80mV, for example. , or reduced to 30mV-50mV, etc. You can choose based on actual needs. In the end, you only need to select from the determined negative electrode memory effect trigger potential interval to obtain the preset negative electrode trigger voltage. The preset negative electrode trigger voltage can be the boundary value of the negative electrode memory effect trigger potential interval, or it can be an intermediate value. It can be determined based on the actual scenario.

The full battery memory effect trigger potential range is the voltage range of the full battery when a phase transition occurs during the charging process of the same type of battery as the target battery. Taking the silicon anode battery as an example, the full-cell memory effect trigger potential range corresponds to: the voltage range of the full battery when the amorphous phase to crystalline phase transition occurs during the charging process of the same type of battery as the target battery. This range is obtained by performing parameter electrode testing on batteries of the same type as the target battery. During the test process, the BMS of the battery under test obtains the negative electrode voltage and reference electrode voltage during the charging process. When the negative electrode voltage is in the negative electrode memory effect When triggering the potential range, corresponding to the voltage range of the recorded reference electrode, the triggering potential range of the full battery memory effect can be obtained. In the end, you only need to select within the full-cell memory effect trigger potential range to obtain the preset full-cell trigger voltage corresponding to the target battery and store it in the BMS of the target battery.

The charge parameter range triggered by the full battery memory effect is the state of charge parameter range of the full battery when a phase transition occurs during the charging process of the same type of battery as the target battery. The acquisition method of the preset full-battery trigger charging parameters is similar to the acquisition method of the preset full-battery trigger voltage. During the charging test, when the negative electrode voltage of the battery is in the negative electrode memory effect trigger potential interval, the corresponding state-of-charge parameter interval is recorded. , the full battery memory effect triggered charging parameter range can be obtained, and finally the full battery memory effect triggered charging parameter range is selected to obtain the preset full battery triggered charging parameters.

The corresponding ones are: φ'=f'(T1, T2, I, SOC0), SOC'=h'(T1, T2, I, SOC0), where φ' is the charging voltage at the reference electrode, and SOC' is The state of charge at the reference electrode, T1 is the test environment temperature, T2 is the test battery temperature, I is the test current, SOC0 is the initial SOC of the battery test, that is, the charging voltage at the reference electrode, the test environment temperature, and the test battery Temperature, test current and the initial SOC of the test are related; the state of charge at the reference electrode is also related to the test environment temperature, test battery temperature, test current and the initial SOC of the test.

Generally, for ternary lithium-ion batteries, the preset full-battery trigger voltage setting is greater than or equal to 4.1V, and the preset full-battery trigger charging parameter setting is greater than or equal to 92%.

Referring to Figure 12, in some embodiments, before step 302, the method further includes step 122.

Step 122: Determine the memory effect level based on the cumulative number of charge and discharge cycles in which the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions.

Specifically, the memory effect level is the target battery occurrence and the intensity of the effect. In the actual trigger detection process, since the operating parameters of the target battery need to meet the preset parameter conditions, and the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions, the cumulative number of charge and discharge cycles is greater than or equal to the first preset number of times. , can trigger the memory effect elimination. If only the cumulative number of charge and discharge cycles in which the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions is greater than or equal to the first preset number, the memory effect elimination will not be triggered. Therefore, in the actual analysis process, different memory effect levels can be obtained by combining the historical discharge parameters of the target battery that do not meet the preset phase transition parameter conditions and the cumulative number of charge and discharge cycles to reflect the intensity of the memory effect in the target battery.

Referring to Figure 13, in some embodiments, after step 122, the method further includes step 132.

Step 132: Push the current corresponding memory effect elimination strategy to the user terminal according to the memory effect level and the preset correspondence relationship between the memory effect level and the memory effect elimination strategy.

Specifically, the BMS of the target battery combines the historical discharge parameters of the target battery with the cumulative number of charge and discharge cycles that do not meet the preset phase transition parameter conditions. After matching different memory effect levels for the target battery, it will further combine the memory effect levels to determine the target battery. The battery matches the corresponding memory effect elimination strategy and pushes the memory effect elimination strategy to the user terminal to guide the user to determine whether to perform memory effect elimination according to the memory effect elimination strategy and when to perform the memory effect elimination operation, effectively improving the efficiency of memory effect elimination. Convenience.

It can be understood that the memory effect level and the specific form of the memory effect elimination strategy are not unique. For example, in a more detailed embodiment, the accumulated charge and discharge of the target battery whose historical discharge parameters do not meet the preset phase transition parameter conditions can be When the number of cycles is 1-3 times, it is defined as a first-level memory effect, 4-6 times is defined as a second-level memory effect, 7-9 times is defined as a third-level memory effect, and 10 or more times is defined as a fourth-level memory effect.

In this embodiment, the higher the level of the memory effect, the greater the intensity of the memory effect. Therefore, when the first-level memory effect is matched, a reminder is obtained to execute the memory effect elimination strategy; when the second-level memory effect is matched, a suggestion is obtained to execute the memory effect elimination strategy. Strategy; when matching with level 3 memory effects, you will get an early warning and execute the memory effect elimination strategy; when matching with level 4 memory effects, you will get forced execution of the memory effect elimination strategy.

In order to facilitate understanding of the technical solution of the present application, the present application will be explained below in conjunction with more detailed embodiments.

First, during the operation of the target battery, the historical charging parameters and historical discharge parameters of the target battery are collected, and the historical charging parameters are compared and analyzed with the preset parameter conditions, and the historical discharge parameters are compared and analyzed with the preset phase transition parameter conditions. , record the number of cycles in which the historical charging parameters meet the preset trigger parameter conditions, and the number of cycles in which the historical discharge parameters do not meet the preset phase transition parameter conditions.

During this process, the BMS collects the health status of the target battery in real time and measures the running time of the target battery. Combined with the battery health status collected each time, the corresponding battery health status decline rate and the battery health status decline rate increase are obtained. , respectively, are compared and analyzed with the preset speed threshold and the preset speed increase threshold. At the same time, the collected battery health status is also compared and analyzed with the estimated health status obtained through the battery health status decay curve analysis.

Whether it is detected that the descending speed is greater than or equal to the preset speed threshold, the descent speed increase is greater than or equal to the preset speed increase threshold, the health state is less than the estimated health state corresponding to the current moment, or it is detected that the target battery running time is greater than or equal to the preset The running time, the number of cycles in which the historical charging parameters meet the preset trigger parameter conditions is greater than or equal to the second preset number, or the BMS receives a memory effect elimination command sent by the user terminal, the BMS will consider that the operating parameters of the target battery meet the preset parameter conditions. .

When the operating parameters meet the preset parameter conditions, if it is simultaneously detected that the cumulative number of charge and discharge cycles in which the historical discharge parameters do not meet the preset phase transition parameter conditions is greater than or equal to the first preset number, the memory effect elimination is triggered. The BMS then pushes the elimination plan to the user terminal, for example, recommending to the user terminal a solution to eliminate the problem at an after-sales service point or to eliminate it autonomously through charging. At the same time, the BMS also pushes the memory effect elimination strategy corresponding to the current memory effect level to the user terminal. If the solution is pushed to the after-sales service point for elimination, the user will carry the battery to the after-sales service point in conjunction with the memory effect elimination strategy, and connect to the corresponding elimination device to balance the power of each cell in the target battery, and then use the user terminal or The elimination device returns a confirmation signal to the BMS to eliminate the memory effect. Under the action of this signal, the elimination device discharges the target battery, for example, at 0.33C (0.33 times rated current). During the discharge process, the discharge parameters (including negative electrode discharge voltage, full battery discharge voltage or state of charge parameters are obtained in real time), if the discharge is detected and the full battery discharge voltage is less than or equal to the predetermined Assuming the phase transition voltage of the whole battery (for example, 2.8V), it is judged that the target battery has completed the memory effect elimination.

If the BMS pushes a charge-autonomous elimination plan, the user will return a confirmation signal through the user terminal according to the memory effect elimination strategy corresponding to the memory effect level to confirm that the memory effect will be eliminated on the target battery during the next charge. After that, the user connects the target battery to the charging pile (using the charging pile as the elimination device), and the BMS obtains the preset elimination current from the charging pile, or combines the preset elimination current stored inside the BMS with the current charge state of the target battery to calculate Get the estimated elimination time and push it to the user terminal to inform the user. If the user terminal returns a confirmation signal to eliminate the memory effect, the memory effect will be eliminated on the target battery; if the user terminal does not return a confirmation signal to eliminate the memory effect, there is no need to eliminate the memory effect and the target battery will be charged normally.

Under the action of the confirmation signal that eliminates the memory effect, the charging pile discharges the target battery, for example, at 0.33C. The full battery discharge voltage is obtained in real time during the discharge process. If the discharge is detected and the full battery discharge voltage is less than or equal to the preset full battery phase transition voltage (for example, 2.8V), it is determined that the target battery has completed memory effect elimination.

Furthermore, the memory effect elimination verification is performed on the actual battery using the above memory effect elimination method. In this embodiment, a lithium-ion battery with a negative electrode composed of 15% silicon and 85% graphite is used as an example. Refer to Figure 14. The battery cycles between 10% SOC and 97% SOC. Due to the memory effect, the capacity of the battery is The attenuation is extremely fast. When the cycle reaches 340 cycles (charge and discharge cycle), the above solution is used to eliminate the memory effect of the battery. Discharge until the full battery discharge voltage is lower than the preset full battery phase transition voltage of 2.8V. Afterwards, two capacity tests were carried out, as shown in the table below. The error in the capacity value of the two tests was 0.1Ah, which is considered a test error, that is, one discharge can restore the full reversible capacity of the battery.

次数frequency	容量/AhCapacity/Ah
11	154.8154.8
22	154.9154.9

It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated in this article, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

Based on the same inventive concept, embodiments of the present application also provide a memory effect elimination device for implementing the above-mentioned memory effect elimination method. The solution to the problem provided by this device is similar to the solution recorded in the above method. Therefore, for the specific limitations in one or more embodiments of the memory effect elimination device provided below, please refer to the above description of the memory effect elimination method. Limitations will not be repeated here.

In some embodiments, as shown in FIG. 15 , the present application provides a memory effect elimination device, including a discharge parameter acquisition module 152 and an elimination analysis module 154 .

The discharge parameter acquisition module 152 is used to obtain the discharge parameters of the target battery during the discharge process when receiving a confirmation signal for eliminating the memory effect; the elimination analysis module 154 is used to determine that the target battery has completed the memory effect when the discharge parameters meet the preset phase transition parameter conditions. eliminate.

In some embodiments, the elimination analysis module 154 is also used to determine that the target battery has completed memory effect elimination when the negative electrode discharge voltage is greater than or equal to the preset negative electrode phase transition voltage.

In some embodiments, the elimination analysis module 154 is also used to determine that the target battery has completed memory effect elimination when the full battery discharge parameter is less than or equal to the preset full battery phase transition parameter.

In some embodiments, the elimination analysis module 154 is also used to determine that the target battery has completed memory effect elimination when the full battery discharge voltage is less than or equal to the preset full battery phase transition voltage.

In some embodiments, the elimination analysis module 154 is also used to determine that the target battery has completed memory effect elimination when the state-of-charge parameter is less than or equal to the preset full-battery phase transition charging parameter.

Referring to Figure 16, in some embodiments, before the discharge parameter acquisition module 152, the device further includes a trigger analysis module 162. The trigger analysis module 162 is used to perform a trigger analysis on the target battery to eliminate the memory effect, and determine whether the target battery meets the trigger conditions for memory effect elimination.

Referring to Figure 17, in some embodiments, before the discharge parameter acquisition module 152, the device further includes a push module 172. The push module 172 is used to push the elimination plan to the user terminal when the target battery meets the trigger condition.

In some embodiments, the push module 172 is also used to obtain the expected elimination time of memory effect elimination, and push the expected elimination time to the user terminal.

Referring to FIG. 18 , in some embodiments, before the discharge parameter acquisition module 152 , the device further includes a charge balancing module 182 . The power balancing module 182 is used to balance the power of each cell in the target battery.

Referring to Figure 19, in some embodiments, before the discharge parameter acquisition module 152, the device further includes a memory effect level analysis module 192. The memory effect level analysis module 192 is used to determine the memory effect level based on the cumulative number of charge and discharge cycles in which the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions.

In some embodiments, the memory effect level analysis module 192 is also used to push the current corresponding memory effect elimination strategy to the user terminal according to the memory effect level and the correspondence between the preset memory effect level and the memory effect elimination strategy.

Each module in the above memory effect elimination device can be implemented in whole or in part by software, hardware and combinations thereof. Each of the above modules may be embedded in or independent of the processor of the computer device in the form of hardware, or may be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

The above-mentioned memory effect elimination device, after the BMS of the target battery receives the confirmation signal to eliminate the memory effect, will obtain the discharge parameters of the target battery, and compare and analyze the real-time obtained discharge parameters with the preset phase transition parameter conditions. When the discharge parameters meet the preset phase transition parameter conditions, the memory effect on the target battery is eliminated. This solution can eliminate the memory effect of the target battery by discharging the target battery so that the discharge parameters meet the preset phase transition parameter conditions, thereby alleviating the problem of rapid attenuation of the battery capacity of the target battery due to the memory effect.

In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in Figure 20. The computer device includes a processor, memory, communication interface, display screen and input device connected through a system bus. Wherein, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes non-volatile storage media and internal memory. The non-volatile storage medium stores operating systems and computer programs. This internal memory provides an environment for the execution of operating systems and computer programs in non-volatile storage media. The communication interface of the computer device is used for wired or wireless communication with external terminals. The wireless mode can be implemented through WIFI, mobile cellular network, NFC (Near Field Communication) or other technologies. The computer program, when executed by the processor, implements a memory effect elimination method.

Those skilled in the art can understand that the structure shown in Figure 20 is only a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer equipment to which the solution of the present application is applied. Specific computer equipment can May include more or fewer parts than shown, or combine certain parts, or have a different arrangement of parts.

In some embodiments, a computer device is provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, it implements the steps of any of the above memory effect elimination methods.

In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above memory effect elimination methods are implemented.

In some embodiments, a computer program product is provided, including a computer program that implements the steps of any one of the above memory effect elimination methods when executed by a processor.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage. In the media, when executed, the computer program may include the processes of the above method embodiments. Any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetic variable memory (Magnetoresistive Random Access Memory (MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory may include random access memory (Random Access Memory, RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in many forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM). The databases involved in the various embodiments provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include blockchain-based distributed databases, etc., but are not limited thereto. The processors involved in the various embodiments provided in this application may be general-purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to this.

The above-mentioned computer equipment, storage media and computer program products, after the BMS of the target battery receives the confirmation signal to eliminate the memory effect, will obtain the discharge parameters of the target battery, and compare the real-time obtained discharge parameters with the preset phase transformation parameters. The conditions are compared and analyzed, and when the discharge parameters meet the preset phase transition parameter conditions, the memory effect of the target battery is eliminated. This solution can eliminate the memory effect of the target battery by discharging the target battery so that the discharge parameters meet the preset phase transition parameter conditions, thereby alleviating the problem of rapid attenuation of the battery capacity of the target battery due to the memory effect.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. The scope shall be covered by the claims and description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A memory effect elimination method, including:

When receiving the confirmation signal to eliminate the memory effect, obtain the discharge parameters of the target battery during the discharge process;

When the discharge parameters meet the preset phase transition parameter conditions, it is determined that the target battery has completed memory effect elimination; wherein phase transition refers to the transformation of the battery material from a crystalline phase to an amorphous phase during the discharge process.
The memory effect elimination method according to claim 1, wherein the discharge parameter includes a negative electrode discharge voltage, and when the discharge parameter meets a preset phase transition parameter condition, determining that the target battery has completed memory effect elimination includes:

When the negative electrode discharge voltage is greater than or equal to the preset negative electrode phase transition voltage, it is determined that the target battery has completed memory effect elimination.
The memory effect elimination method according to claim 2, wherein the preset negative electrode phase transition voltage is determined based on the negative electrode phase transition potential interval of the same type of battery as the target battery.
The memory effect elimination method according to claim 1, wherein the discharge parameters include full battery discharge parameters, and when the discharge parameters meet the preset phase transition parameter conditions, it is determined that the target battery has completed the memory effect elimination, including :

When the full battery discharge parameter is less than or equal to the preset full battery phase transition parameter, it is determined that the target battery has completed memory effect elimination.
The memory effect elimination method according to claim 4, wherein the full battery discharge parameter includes a full battery discharge voltage, the preset full battery phase transition parameter includes a preset full battery phase transition voltage, and when the full battery If the battery discharge parameter is less than or equal to the preset full battery phase transition parameter, it is determined that the target battery has completed the memory effect elimination, including:

When the full battery discharge voltage is less than or equal to the preset full battery phase transition voltage, it is determined that the target battery has completed memory effect elimination.
The memory effect elimination method according to claim 5, wherein the method for determining the preset full battery phase transition voltage includes any one of the following:

The first item is to perform a reference electrode test on the same type of battery based on the negative electrode phase transition potential interval of the same type of battery as the target battery to obtain the full battery phase transition potential interval, and based on the full battery phase transition potential interval Determine the preset full battery phase transition voltage;

The second item is based on the negative electrode silicon content parameters of the same type of battery as the target battery, and the relationship between the preset silicon content parameters and the full battery phase transition potential interval, matching the corresponding full battery phase transition potential interval, and based on the required The corresponding full-cell phase transition potential interval determines the preset full-cell phase transition voltage.
The memory effect elimination method according to claim 4, wherein the full battery discharge parameter includes a state of charge parameter, the preset full battery phase transition parameter includes a preset full battery phase transition charging parameter, and when the If the full battery discharge parameter is less than or equal to the preset full battery phase transition parameter, it is determined that the target battery has completed the memory effect elimination, including:

When the state of charge parameter is less than or equal to the preset full battery phase transition charging parameter, it is determined that the target battery has completed memory effect elimination.
The memory effect elimination method according to claim 7, wherein the confirmation method of the preset full battery phase transition charging parameters includes:

The preset full battery phase change charging parameter is calculated based on the negative electrode silicon content parameters of the same type of battery as the target battery and the preset phase change charging parameter calculation model.
The method for eliminating the memory effect according to any one of claims 1 to 8, wherein when receiving a confirmation signal for eliminating the memory effect and before obtaining the discharge parameters during the discharge process of the target battery, the method further includes:

Perform a memory effect elimination trigger analysis on the target battery to determine whether the target battery meets the memory effect elimination trigger conditions.
The memory effect elimination method according to claim 9, wherein, before receiving the confirmation signal to eliminate the memory effect and obtaining the discharge parameters during the target battery discharge process, it also includes:

When the target battery meets the trigger condition, the elimination plan is pushed to the user terminal.
The memory effect elimination method according to claim 10, wherein when receiving a confirmation signal to eliminate the memory effect and before obtaining the discharge parameters during the target battery discharge process, it further includes:

Obtain the estimated elimination time of memory effect elimination, and push the estimated elimination time to the user terminal.
The memory effect elimination method according to claim 10, wherein when receiving a confirmation signal to eliminate the memory effect and before obtaining the discharge parameters during the target battery discharge process, it further includes:

Perform power balancing on each cell in the target battery.
The memory effect elimination method according to claim 9, wherein the target battery meets the triggering conditions for memory effect elimination, including:

The operating parameters of the target battery meet the preset parameter conditions, and the cumulative number of charge and discharge cycles for which the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions is greater than or equal to the first preset number.
The memory effect elimination method according to claim 13, wherein the operating parameters of the target battery meet preset parameter conditions, including any one of the following:

The first item is that the declining speed of the health status of the target battery is greater than or equal to the preset speed threshold;

The second item is that the increase in the decline speed of the health state of the target battery is greater than or equal to the preset speed increase threshold;

The third item is that in the last charging and discharging cycle after the target battery completes the memory effect elimination, the number of cycles in which the historical charging parameters meet the preset trigger parameter conditions is greater than or equal to the second preset number of times;

Item 4: The health state of the target battery is less than the estimated health state corresponding to the current moment;

Item 5: The running time of the target battery is greater than or equal to the preset running time;

Item 6: Receive memory effect elimination instructions.
The memory effect elimination method according to claim 14, wherein the historical charging parameters meet preset trigger parameter conditions, including at least one of the following:

The first item is that the historical negative charging voltage is less than the preset negative trigger voltage;

The second item is that the historical full battery charging voltage is greater than the preset full battery trigger voltage;

The third item is that the historical state-of-charge parameter is greater than the preset full-battery trigger charging parameter.
The memory effect elimination method according to claim 15, which includes any one of the following:

The first item, the method of obtaining the preset negative electrode trigger voltage includes: analyzing and obtaining the preset negative electrode trigger voltage according to the negative electrode memory effect trigger potential interval of the battery of the same type as the target battery;

The second item, the method of obtaining the preset full-cell trigger voltage includes: performing a reference electrode test based on the negative electrode memory effect trigger potential interval of the same type of battery as the target battery to obtain the full-cell memory effect trigger potential interval; and Obtain the preset full-battery trigger voltage according to the full-battery memory effect trigger potential interval;

The third item, the method for obtaining the preset full-battery trigger charging parameters includes: performing a reference electrode test based on the negative electrode memory effect trigger potential interval of the same type of battery as the target battery to obtain the full-battery memory effect trigger charge parameter interval; and obtain the preset full-battery triggered charging parameter according to the full-battery memory effect triggered charging parameter interval.
The memory effect elimination method according to claim 13, wherein when receiving a confirmation signal to eliminate the memory effect and before obtaining the discharge parameters during the target battery discharge process, it further includes:

The memory effect level is determined according to the accumulated number of charge and discharge cycles in which the historical discharge parameters of the target battery do not meet the preset phase transition parameter conditions.
The method for eliminating the memory effect according to claim 17, wherein before receiving the confirmation signal for eliminating the memory effect and before obtaining the discharge parameters during the discharge process of the target battery, the method further includes:

According to the memory effect level and the corresponding relationship between the preset memory effect level and the memory effect elimination strategy, the current corresponding memory effect elimination strategy is pushed to the user terminal.
A memory effect elimination device, including:

The discharge parameter acquisition module, when receiving the confirmation signal to eliminate the memory effect, acquires the discharge parameters of the target battery during the discharge process;

The elimination analysis module is used to determine that the target battery has completed memory effect elimination when the discharge parameters meet the preset phase transition parameter conditions; wherein phase transition refers to the transformation of the battery material from a crystalline phase to an amorphous phase during the discharge process.
A computer device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, it implements the steps of the memory effect elimination method according to any one of claims 1 to 18.
A computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the memory effect elimination method of any one of claims 1 to 18 are implemented.
A computer program product, including a computer program that implements the steps of the memory effect elimination method according to any one of claims 1 to 18 when executed by a processor.