Battery charging method and device, electronic equipment and storage medium

Abstract

The invention relates to a battery charging method and device, electronic equipment, a computer readable storage medium and a computer program product, and the method comprises the steps: monitoring whether a pulse discharge condition is triggered or not in a process that a charging device charges a battery; under the condition that the pulse discharge condition is triggered, a pulse discharge instruction is sent out; and controlling the battery to perform pulse discharge, wherein the discharge current of the pulse discharge is smaller than a preset discharge current. Based on the scheme of the embodiment of the invention, the safety of the battery cell is improved, so that the service life of the battery cell can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery charging method, a battery charging device, an electronic device, a computer-readable storage medium, and a computer program product. Background Art

[0002] With the development of lithium / sodium ion battery technology, lithium / sodium batteries have been widely used in new energy vehicles, energy storage and other fields, and people have put forward higher and higher requirements on the charging speed and charging safety of batteries. However, when charging with excessive current, metallic lithium / sodium will be precipitated at the negative electrode, resulting in lithium / sodium precipitation, which affects charging safety. Therefore, there is a need to improve charging safety. Summary of the invention

[0003] Based on this, it is necessary to provide a battery charging method, a battery charging device, an electronic device, a computer-readable storage medium and a computer program product that can improve charging safety in response to the above technical problems.

[0004] In a first aspect, the present application provides a battery charging method, the method comprising:

[0005] During the process of charging the battery by the charging device, monitoring whether a pulse discharge condition is triggered;

[0006] When the pulse discharge condition is triggered, a pulse discharge instruction is issued;

[0007] The battery is controlled to perform pulse discharge, and the discharge current of the pulse discharge is less than a preset discharge current.

[0008] Based on the battery charging method provided in the embodiment of the present application, during the process of the charging device charging the battery, when the pulse discharge is triggered, the battery is controlled to perform pulse discharge, and the discharge current of the pulse discharge is less than the preset discharge current, that is, the discharge current is small enough to achieve small current pulse discharge. Through the small rate discharge current, the difference in lithium ion concentration in the electrolyte is small, thereby improving the charging efficiency, effectively maintaining the battery performance, improving the battery charging safety, and helping to improve the safety of the battery cell, thereby improving the battery cell life.

[0009] In some embodiments, the method further comprises:

[0010] When the discharge duration of the pulse discharge reaches a preset discharge duration, the discharge is stopped.

[0011] Therefore, during the process of small current pulse discharge, by controlling the duration of the pulse discharge to reach the preset discharge duration, the problem of small driving force for the release of active lithium from the negative electrode due to small current discharge can be effectively compensated, so that the capacity of the battery cell can be restored, which helps to improve the safety and life of the battery cell.

[0012] In some embodiments, the method further comprises: starting timing when the pulse discharge begins;

[0013] The discharging is stopped when the discharge duration of the pulse discharge reaches a preset discharge duration, including: the discharging is stopped when the discharge duration of the pulse discharge reaches a preset discharge duration, or the timing duration reaches a preset timing duration, and the preset timing duration is less than a preset duration threshold.

[0014] Therefore, when timing starts from the beginning of pulse discharge, since pulse discharge is a discharge mechanism in which the current changes suddenly and instantly and the action time is extremely short, after entering the pulse discharge process, it is not always in a discharge state. If the discharge time is too long, it will also affect the charging efficiency. Therefore, combined with the timing time, when the timing time reaches the preset timing time, the discharge is stopped, thereby improving the safety and life of the battery cell while meeting the demand for battery charging efficiency.

[0015] In some embodiments, when a pulse discharge condition is triggered, issuing a pulse discharge instruction includes:

[0016] When a pulse discharge condition is triggered, a charging request is sent to the charging device, wherein the charging request is used to request the charging device to provide a charging current of 0 amperes;

[0017] When the charging current provided by the charging device is less than the preset charging current, a pulse discharge instruction is issued.

[0018] When pulse discharge is needed, the charging device is first requested to provide a charging current of 0 amperes. However, in actual technical scenarios, the charging current of the charging device is difficult to reach absolute 0 amperes. Therefore, when the charging current provided by the charging device is less than the preset charging current, a pulse discharge instruction is issued. The pulse discharge process can be started when the charging current provided by the charging device has been reduced to an acceptable current range, which can improve the efficiency of battery charging while improving the safety and life of the battery cells.

[0019] In some embodiments, controlling the battery to perform pulse discharge includes:

[0020] The battery is controlled to discharge to the charging device.

[0021] Therefore, in the process of controlling the battery to perform pulse discharge, the battery is controlled to discharge to the charging device, realizing a two-way current transmission process between the charging device and the battery, thereby improving charging safety.

[0022] In some embodiments, controlling the battery to perform pulse discharge includes:

[0023] The battery is controlled to discharge to the power load of the device where the battery is located.

[0024] Therefore, in the process of controlling the battery to perform pulse discharge, the battery is controlled to discharge to the charging device, realizing a two-way current transmission process between the charging device and the battery, thereby improving charging safety.

[0025] In some embodiments, the method further comprises:

[0026] When it is determined that the battery is in the end-of-charging state, a pulse discharge instruction is sent to the power load of the device where the battery is located;

[0027] Controlling the battery to discharge to the power load of the device where the battery is located, and starting timing, the discharge current of the pulse discharge is less than the preset discharge current;

[0028] When the discharge time reaches the preset discharge time, or the timing time reaches the preset timing time, the discharge is stopped and the charging process is completed.

[0029] Therefore, after charging is completed, the battery can further perform pulse discharge to the power load of the device where the battery is located, so that after the charging process of the charging device to the battery is completed, the lithium plating phenomenon that may occur during the last charging process of the charging device is further alleviated by discharging to the power load, so as to further maintain the battery performance and improve the safety and life of the battery cell.

[0030] In some embodiments, the preset discharge current comprises 30 amperes.

[0031] Therefore, by setting the preset discharge current to 30 amperes, the lithium-ion battery cell uses a small rate discharge current for pulse discharge to maintain battery performance and improve battery cell safety and service life.

[0032] In some embodiments, the preset discharge duration is greater than or equal to 10 seconds and less than or equal to 240 seconds.

[0033] Therefore, by setting the discharge time between 10 seconds and 240 seconds, the demand for charging efficiency can be met while slowing down the lithium decomposition phenomenon.

[0034] In some embodiments, the preset timing duration includes 300 seconds.

[0035] Therefore, by setting the timing time to 300 seconds, the problem of excessive discharge or affecting charging efficiency due to too long discharge time can be reduced, thereby improving the charging efficiency.

[0036] In some embodiments, the preset charging current comprises 50 amperes.

[0037] Therefore, by setting the preset charging current to 50 amperes, when the charging current provided by the charging device is reduced to 50 amperes, the battery can request discharge from the charging device, thereby improving the efficiency of battery charging while improving the safety and life of the battery cells.

[0038] In a second aspect, the present application provides a battery charging device, the device comprising:

[0039] A charging monitoring module, used to monitor whether a pulse discharge condition is triggered during the process of charging the battery by the charging device;

[0040] A discharge request module, used to issue a pulse discharge instruction when the charging monitoring module detects a trigger pulse discharge condition;

[0041] The discharge control module is used to control the battery to perform pulse discharge, wherein the discharge current of the pulse discharge is less than a preset discharge current.

[0042] In a third aspect, the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the method in any one of the embodiments described above when executing the computer program.

[0043] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method in any one of the embodiments described above.

[0044] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method in any one of the embodiments described above.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0047] Figure 1 A schematic diagram of an application scenario of battery charging in some embodiments of the present application;

[0048] Figure 2 A schematic flow chart of a battery charging method according to some embodiments of the present application;

[0049] Figure 3 A schematic flow chart of a battery charging method according to some other embodiments of the present application;

[0050] Figure 4 This is an example schematic diagram of a pulse signal in some embodiments of the present application;

[0051] Figure 5 A schematic flow chart of a battery charging method in some other embodiments of the present application;

[0052] Figure 6 A schematic flow chart of a battery charging method in some other embodiments of the present application;

[0053] Figure 7 A schematic flow chart of a battery charging method in some other embodiments of the present application;

[0054] Figure 8 Schematic diagram of a battery charging method in some specific embodiments of the present application;

[0055] Fig. 9 Schematic diagram of a flow chart of a battery charging method in some other specific embodiments of the present application;

[0056] Fig.10 A schematic diagram of a curve showing the relationship between the capacity retention rate and the number of cycles of a battery cell in some embodiments of the present application;

[0057] Fig.11 is a structural block diagram of a battery charging device in some embodiments of the present application;

[0058] Fig.12 This is a diagram of the internal structure of an electronic device according to some embodiments of the present application. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0067] At present, with the development of lithium / sodium ion battery technology, lithium / sodium batteries have been widely used in new energy vehicles, energy storage and other fields, and people have put forward higher and higher requirements on the charging speed and charging safety of battery charging. However, when charging with excessive current, metallic lithium / sodium will be precipitated at the negative electrode, resulting in lithium / sodium precipitation, which will affect charging safety. Based on this, a method of short-term discharge during the charging process has emerged to alleviate the lithium / sodium precipitation phenomenon during the charging process and improve charging safety. However, in the current short-term discharge process, a larger current is usually used for discharge to ensure the driving force for the lithium precipitation of the negative electrode.

[0068] However, using a larger current to discharge during the charging process will cause the battery to discharge quickly, which will increase the amount of electricity released by the battery and cause the battery's power to drop rapidly, so that the charging device needs to provide more power again to complete the final charging process. Taking the discharge of the battery to the charging device as an example, the charging device provides a large amount of electricity to the battery during the charging stage, but the battery will release a large amount of electricity to the charging device during the discharge stage, resulting in the charging device actually recovering a large amount of electricity, so that the charging device needs a longer charging process to fully charge the battery, affecting the charging efficiency. In addition, when the battery is discharged at a large current, it will also affect the charging safety and reduce the life of the battery cell.

[0069] After research, it was found that in the process of charging the battery, in the short-term discharge stage of the battery, the battery can be discharged with a small current, that is, the difference in lithium ion concentration in the electrolyte is small, so that the amount of electricity discharged by the battery is small enough to minimize the decline in battery power, so that the battery capacity can be quickly restored to improve charging efficiency, and at the same time meet the needs of improving charging safety and increasing battery life.

[0070] Accordingly, reference Figure 1As shown, when the battery 20 needs to be charged, the battery 20 can be charged by the charging device 10. The battery 20 can be a battery in any device, such as a battery in an electric vehicle. Correspondingly, the charging device 10 is a device that can realize the charging function. Taking the battery 20 as a battery in an electric vehicle as an example, the charging device 10 can be a charging pile. In the process of the charging device 10 charging the battery 20, the battery 20 can be controlled to discharge for a short time, and the discharge current is small enough, so as to realize a short-time discharge with a small current, so as to improve the charging efficiency and maintain the battery performance, so as to improve the battery life.

[0071] refer to Figure 2 As shown, an embodiment of the present application provides a battery charging method, which can be executed by a BMS (Battery Management System) of a device where the battery is located. The method includes:

[0072] Step S200: During the process of charging the battery by the charging device, monitoring whether a pulse discharge condition is triggered.

[0073] Charging a battery by a charging device means that the charging device first provides electrical energy to the battery to increase the electrical energy stored in the battery. The way in which the charging device and the battery start charging is not limited. For example, when the battery is a battery of an electric vehicle and the charging device is a charging pile, the electric vehicle may be connected to the charging pile and then send a charging request to the charging pile to start the process of charging the battery by the charging device.

[0074] The pulse discharge condition refers to the condition that the charging device temporarily stops charging the battery and starts discharging the battery. The specific pulse discharge condition is not limited and can be defined in combination with various technical requirements.

[0075] For example, in some embodiments, the pulse discharge condition may be considered to be satisfied when the charging time of the charging device to charge the battery reaches a certain predetermined charging time. The predetermined charging time may be set in combination with actual needs. For example, only one predetermined charging time is provided, and each time the predetermined charging time is reached, the pulse discharge condition is considered to be satisfied. Alternatively, multiple predetermined charging times are provided and arranged in order. When the charging time of the first charge reaches the first predetermined charging time, or the charging time of the second charge reaches the second predetermined charging time, and so on, the pulse discharge condition is determined to be satisfied.

[0076] In other embodiments, the pulse discharge condition may be considered to be satisfied when the amount of electricity charged by the charging device to the battery reaches a certain predetermined amount of electricity. The predetermined amount of electricity may be set in combination with actual needs. For example, only one predetermined amount of electricity is provided, and when the predetermined amount of electricity is reached during each charging process, the pulse discharge condition is considered to be satisfied. Alternatively, multiple predetermined amounts of electricity are provided and arranged in sequence. When the amount of electricity of the battery reaches the first predetermined amount of electricity after the first charge, or the amount of electricity of the battery reaches the second predetermined amount of electricity after the second charge, and so on, the pulse discharge condition is determined to be satisfied.

[0077] It should be understood that in other embodiments, the pulse discharge conditions may also be set in other ways.

[0078] Step S400: When the pulse discharge condition is triggered, a pulse discharge instruction is issued.

[0079] The trigger pulse discharge condition indicates that the battery needs to start discharging, so the battery sends a pulse discharge instruction, and the pulse discharge instruction is used to indicate that a discharge operation needs to be performed.

[0080] Step S600: controlling the battery to perform pulse discharge, wherein the discharge current of the pulse discharge is less than a preset discharge current.

[0081] Among them, pulse discharge refers to discharge in the form of pulse current. It discharges between the rising edge and the falling edge of the pulse signal, that is, when the signal value is greater than the predetermined signal amplitude. It is fast and short in time, that is, within a signal cycle, there is only a very short time for discharge.

[0082] It should be understood that during the pulse discharge process of the battery, the discharge may be performed through more than one pulse signal, that is, the pulse discharge process of the battery may be achieved by sending multiple pulse signals.

[0083] The discharge current of the pulse discharge is smaller than the preset discharge current, that is, the discharge current is small enough to realize small current pulse discharge, wherein the magnitude of the discharge current can be determined by designing and controlling the pulse signal, for example, by determining the signal amplitude of the pulse signal to limit the discharge current of the pulse discharge.

[0084] Among them, the preset discharge current can be set to a sufficiently small current. In the embodiment of the present application, it can be a current in amperes, that is, the preset discharge current is independent of the size of the battery capacity, so that the battery is discharged with a smaller current when discharging.

[0085] Based on the battery charging method provided in the embodiment of the present application, during the process of the charging device charging the battery, when the pulse discharge is triggered, the battery is controlled to perform pulse discharge, and the discharge current of the pulse discharge is less than the preset discharge current, that is, the discharge current is small enough to achieve small current pulse discharge. Through the small rate discharge current, the difference in lithium ion concentration in the electrolyte is small, thereby effectively maintaining the battery performance, improving the battery charging safety, and helping to improve the safety of the battery cell, thereby improving the battery cell life.

[0086] In some embodiments, reference Figure 3 As shown, the method also includes:

[0087] Step S700: When the discharge duration of the pulse discharge reaches a preset discharge duration, the discharge is stopped.

[0088] The pulse discharge duration refers to the actual discharge duration of the battery. Figure 4 Taking the pulse signal of one cycle as an example, the duration of the signal cycle of the pulse signal is from t0 to T, but the current signal is actually emitted and the discharge is actually performed only during the time from t1 to t2 when the current value reaches the current amplitude Im. The actual duration of the pulse discharge in the embodiment of the present application is just as Figure 4 The duration between t1 and t2 shown in .

[0089] It should be understood that in actual technical application scenarios, the waveforms of the pulse signals involved, as well as the magnitude and duration of the current amplitude are not the same. Figure 4 The actual duration of the pulse discharge is merely used to exemplify the actual duration of the pulse discharge, and the actual pulse signal is not limited thereto.

[0090] Therefore, during the process of small current pulse discharge, by controlling the duration of the pulse discharge to reach the preset discharge duration, the problem of small driving force for the release of active lithium from the negative electrode due to small current discharge can be effectively compensated, so that the capacity of the battery cell can be restored, which helps to improve the safety and life of the battery cell.

[0091] In some embodiments, reference Figure 5 As shown, the method also includes:

[0092] Step S800: start timing when pulse discharge begins; stop discharging when the discharge duration of the pulse discharge reaches a preset discharge duration, or the timing duration reaches a preset timing duration, and the preset timing duration is less than a preset duration threshold.

[0093] Among them, the timing starts from the beginning of pulse discharge, which means that the timing starts when the battery enters the pulse discharge state. The waveform of the first pulse signal after the battery enters the pulse discharge is as follows: Figure 4As shown, time t0 is the moment when pulse discharge begins, and timing starts from time t0.

[0094] As mentioned above, the actual discharge duration of the pulse discharge may not be the entire signal duration of the pulse signal. Therefore, the discharge process does not continue after entering the pulse discharge state, that is, the duration after entering the pulse discharge state is not equal to the actual discharge duration. Therefore, after entering the pulse discharge state, the timing is started, and when the discharge duration of the pulse discharge reaches the preset discharge duration, or when the timing duration reaches the preset timing duration, the discharge process is terminated to reduce the actual discharge duration of the designed pulse signal, which is too short and difficult to reach the preset discharge duration for a long time, resulting in the pulse discharge process being too long, thereby affecting the charging efficiency.

[0095] Therefore, when timing starts from the beginning of pulse discharge, since pulse discharge is a discharge mechanism in which the current changes suddenly and instantly and the action time is extremely short, after entering the pulse discharge process, it is not always in a discharge state. If the discharge time is too long, it will also affect the charging efficiency. Therefore, combined with the timing time, when the timing time reaches the preset timing time, the discharge is stopped, thereby improving the safety and life of the battery cell while meeting the demand for battery charging efficiency.

[0096] In some embodiments, reference Figure 6 As shown, the step S400 above, when the pulse discharge condition is triggered, issues a pulse discharge instruction, including:

[0097] Step S401: When a pulse discharge condition is triggered, a charging request is sent to the charging device, wherein the charging request is used to request the charging device to provide a charging current of 0 ampere.

[0098] A charging request is a request for a charging device to charge a battery. The charging request may include information about the requested charging current, which may be determined in combination with the battery performance during the charging stage. In this embodiment of the present application, under pulse discharge conditions, it indicates that the battery needs to prepare to enter the pulse discharge process, that is, the charging device needs to stop charging. Therefore, a charging request containing 0 amperes is sent to the charging device to instruct the charging device to reduce the charging current to 0 amperes, or to instruct the charging device to stop the current stage of the charging process.

[0099] Step S402: When the charging current provided by the charging device is less than a preset charging current, a pulse discharge instruction is issued.

[0100] In actual processes, it is usually difficult for charging devices to reach a state of absolute 0 ampere charging current. Therefore, when the charging current provided by the charging device is less than the preset charging current, it is considered that the charging current provided by the charging device is small enough, so a pulse discharge instruction is issued to start pulse discharge.

[0101] Therefore, when pulse discharge is needed, the charging device is first requested to provide a charging current of 0 amperes. However, in actual technical scenarios, the charging current of the charging device is difficult to reach absolute 0 amperes. Therefore, when the charging current provided by the charging device is less than the preset charging current, a pulse discharge instruction is issued. The pulse discharge process can be started when the charging current provided by the charging device has been reduced to an acceptable current range, which can improve the efficiency of battery charging while improving the safety and life of the battery cells.

[0102] When the battery is performing pulse discharge, the electricity released can be provided to any device that can receive electricity, such as the charging device mentioned above.

[0103] Accordingly, in some embodiments, controlling the battery to perform pulse discharge includes:

[0104] The battery is controlled to discharge to the charging device.

[0105] Therefore, in the process of controlling the battery to perform pulse discharge, the battery is controlled to discharge to the charging device, realizing a two-way current transmission process between the charging device and the battery, thereby improving charging safety.

[0106] In other embodiments, when the battery is performing pulse discharge, it may also be discharged to other devices other than the charging device, such as discharging to the power load of the device where the battery is located. Accordingly, the controlling the battery to perform pulse discharge may also include:

[0107] The battery is controlled to discharge to the power load of the device where the battery is located.

[0108] The power load of the device where the battery is located refers to the load device that needs to consume electricity in the device where the battery is located. Taking the device where the battery is located as an electric vehicle as an example, the power load of the device where the battery is located may refer to the load of the electric vehicle, such as the speaker, air conditioner, etc. of the electric vehicle. Since the power loads of different electric vehicles may be different, when controlling the battery to discharge to the power load of the electric vehicle, the entire electric vehicle may also be controlled to discharge, so as to adapt to the needs of different types of electric vehicles to discharge to the power load.

[0109] Therefore, in the process of controlling the battery to perform pulse discharge, the battery is controlled to discharge to the charging device, realizing a two-way current transmission process between the charging device and the battery, thereby improving charging safety.

[0110] In some embodiments, reference Figure 7 As shown, the method may also include:

[0111] Step S710: When it is determined that the battery is in the charging end state, a pulse discharge instruction is sent to the power load of the device where the battery is located.

[0112] Being in the charging end state means that the process of charging the battery by the charging device is completed and the charging device stops charging the battery, such as the battery power has reached the rated capacity or an expected power lower than the rated capacity, or the charging power charged by the charging device to the battery has reached the preset charging power, at which time the charging device stops charging the battery; for another example, the connection between the charging device and the battery is disconnected for some reason, and the charging device no longer charges the battery.

[0113] Step S702: Control the battery to discharge to the power load of the device where the battery is located, and start timing. The discharge current of the pulse discharge is less than the preset discharge current. When the discharge time reaches the preset discharge time, or the timing time reaches the preset timing time, stop discharging and complete the charging process.

[0114] Therefore, after charging is completed, the battery can further perform pulse discharge to the power load of the device where the battery is located, so that after the charging process of the charging device to the battery is completed, the lithium plating phenomenon that may occur during the last charging process of the charging device is further alleviated by discharging to the power load, so as to further maintain the battery performance and improve the safety and life of the battery cell.

[0115] Among them, the specific value of the above-mentioned preset discharge current can be determined in combination with actual technical applications to take into account the requirements of battery capacity recovery and battery charging efficiency. In some embodiments of the present application, the preset discharge current includes 30 amperes.

[0116] Therefore, by setting the preset discharge current to 30 amperes, the lithium-ion battery cell uses a small rate discharge current for pulse discharge to maintain battery performance and improve battery cell safety and service life.

[0117] In some specific examples, the discharge current of the pulse discharge can be set to a current value between 10A and 30A, so as to meet the requirements of practical applications while ensuring that the discharge current is small, but not too small. For example, in some examples, the discharge current of the pulse discharge can be set to 15A.

[0118] Among them, the specific value of the above-mentioned preset discharge time can be determined in combination with actual technical applications to take into account the requirements of battery capacity recovery and battery charging efficiency. In some embodiments of the present application, the preset discharge time is greater than or equal to 10 seconds and less than or equal to 240 seconds.

[0119] Therefore, by setting the discharge time between 10 seconds and 240 seconds, the demand for charging efficiency can be met while slowing down the lithium decomposition phenomenon.

[0120] Among them, in some specific examples, the discharge duration of the pulse discharge can be set to a time value between 30 seconds and 240 seconds, so that while continuing the small current pulse discharge, it can effectively compensate for the problem of small driving force for the negative electrode to precipitate active lithium and remove it due to the small current discharge. In order to further effectively ensure the driving force, in some examples, the discharge duration of the pulse discharge can be set to a time value between 60 seconds and 240 seconds. For example, in some examples, the discharge duration of the pulse discharge can be set to 240s to maximize the problem of small driving force for the negative electrode to precipitate active lithium and remove it.

[0121] Among them, the specific value of the above-mentioned preset timing duration can be determined in combination with actual technical applications to take into account the requirements of both battery capacity recovery and battery charging efficiency. In some embodiments of the present application, the preset timing duration includes 300 seconds.

[0122] Therefore, by setting the timing time to 300 seconds, the problem of excessive discharge or affecting charging efficiency due to too long discharge time can be reduced, thereby improving the charging efficiency.

[0123] Among them, the specific value of the above-mentioned preset charging current can be determined in combination with actual technical applications to take into account the requirements of battery capacity recovery and battery charging efficiency. In some embodiments of the present application, the preset charging current includes 50 amperes.

[0124] Therefore, by setting the preset charging current to 50 amperes, when the charging current provided by the charging device is reduced to 50 amperes, the battery can request discharge from the charging device, thereby improving the efficiency of battery charging while improving the safety and life of the battery cells.

[0125] Based on the above-mentioned embodiments, some specific application examples are used for illustration. In the following examples, the charging device is a charging pile and the battery is an electric car, that is, the process of charging the charging pile to the charging device is used as an example for illustration. Among them, in the following examples, the preset discharge current includes 30 amperes, the preset discharge time is greater than or equal to 10 seconds and less than or equal to 240 seconds, the preset timing time is 300 seconds, and the preset charging current is 50 amperes.

[0126] refer to Figure 8 As shown, taking the pulse discharge to the charging pile as an example, after the charging pile enters the process of charging the electric vehicle at the beginning of step S801, the following steps are performed.

[0127] Step S802: The BMS of the electric vehicle checks whether it is in a charging state, that is, whether the battery cell, Pack (battery pack) or the entire vehicle is in a charging state. If it is in a charging state, it proceeds to step S803, otherwise it proceeds to step S809.

[0128] Step S803: The BMS of the electric vehicle determines whether the pulse discharge condition is triggered. If triggered, it proceeds to step S804; otherwise, it continues to monitor whether the pulse discharge condition is triggered.

[0129] Step S804: The BMS sends a charging request to the charging pile, requests a current of 0, and collects the current input by the charging pile.

[0130] Step S805: Determine whether the monitored input current of the charging pile is less than 50A (ampere). If so, proceed to step S806. Otherwise, continue to monitor whether the input current of the charging pile is less than 50A.

[0131] Step S806: Send a pulse discharge instruction to the charging pile and start timing.

[0132] Step S807: Determine whether the discharge duration is ≥ 240 seconds, or whether the timing duration is greater than or equal to 300 seconds. If any one of the conditions is met, proceed to step S808; otherwise, continue to monitor the discharge duration and timing duration.

[0133] Step S808: Stop discharging to the charging pile, send a charging request to the charging pile, and return to step S802.

[0134] Step S809: Determine whether charging is completed. If charging is completed, end the charging process.

[0135] refer to Fig. 9 As shown, taking the case where the pulse discharge is to discharge the entire electric vehicle as an example, after the charging pile starts charging the electric vehicle at the beginning of step S901, the following steps are performed.

[0136] Step S902: The BMS of the electric vehicle checks whether it is in a charging state, that is, whether the battery cell, Pack (battery pack) or the entire vehicle is in a charging state. If it is in a charging state, it proceeds to step S903, otherwise it proceeds to step S909.

[0137] Step S903: The BMS of the electric vehicle determines whether the pulse discharge condition is triggered. If triggered, the process proceeds to step S904; otherwise, the process continues to monitor whether the pulse discharge condition is triggered.

[0138] Step S904: The BMS sends a charging request to the charging pile, requests a current of 0, and collects the current input by the charging pile.

[0139] Step S905: Determine whether the monitored input current of the charging pile is less than 50A (ampere). If so, proceed to step S906. Otherwise, continue to monitor whether the input current of the charging pile is less than 50A.

[0140] Step S906: Send a pulse discharge instruction to the entire vehicle, start pulse discharge to the entire vehicle, and start timing.

[0141] Step S907: Determine whether the discharge duration is greater than or equal to 240 seconds, or whether the timing duration is greater than or equal to 300 seconds. If any one of the conditions is met, proceed to step S808; otherwise, continue to monitor the discharge duration and timing duration.

[0142] Step S908: Stop discharging the vehicle and send a charging request to the charging pile. At this time, the current size contained in the charging request is no longer 0A, but the current size actually required, and return to step S802.

[0143] Step S909: Determine whether charging is completed. If charging is completed, proceed to step S910.

[0144] Step S910: Send a pulse discharge instruction to the entire vehicle, start pulse discharge to the entire vehicle, and start timing.

[0145] Step S911: Determine whether the discharge time is greater than or equal to 240 seconds, or whether the timing time is greater than or equal to 300 seconds. If any one of the conditions is met, proceed to step S912.

[0146] Step S912: The entire electric vehicle stops pulse discharging, and the charging process ends.

[0147] Based on the solutions of the embodiments of the present application as described above, when the lithium-ion battery cell uses a small rate discharge current, the difference in lithium ion concentration in the electrolyte is small. On this basis, appropriately extending the discharge time can effectively compensate for the problem of low driving force for the release of active lithium from the negative electrode, thereby restoring the battery cell capacity and improving the safety and life of the battery cell.

[0148] On this basis, the solution of the embodiment of the present application was tested and verified. Under the same charging environment, different discharge currents and discharge times were used during pulse discharge to verify the life of the same type of battery cells after charging. Fig.10As shown, it can be determined that the battery cell obtained by charging with a pulse discharge current of 2.5C and a pulse discharge duration of 10s has a rapid decrease in capacity as the number of cycles increases, and the capacity retention rate after the cycle is difficult to return to a high level after charging. Based on the method of the embodiment of the present application, by using a small current for discharge, for example Fig.10 The cell obtained by charging with the pulse discharge method of the 15A pulse discharge current shown in the figure has a significantly slower rate of cell capacity decline than that of the 2.5C method, and the capacity retention rate after the cycle can also be restored to a relatively high level. By appropriately extending the pulse discharge time, for example, the pulse discharge time is extended from 10 seconds to 240 seconds when the pulse discharge current is also 15A, the problem of low driving force for the release of active lithium from the negative electrode is effectively compensated, so that the cell capacity can be restored to a relatively high capacity, and the safety and life of the cell are improved.

[0149] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0150] Based on the same inventive concept, the embodiment of the present application also provides a battery charging device for implementing the battery charging method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery charging device embodiments provided below can refer to the limitations of the battery charging method above, and will not be repeated here.

[0151] The present application also provides a battery charging device, wherein the reference Fig.11 As shown, the battery charging device in some embodiments includes a charging monitoring module 111 , a discharging request module 112 and a discharging control module 113 .

[0152] in:

[0153] The charging monitoring module 111 is used to monitor whether a pulse discharge condition is triggered during the process of charging the battery by the charging device;

[0154] A discharge request module 112, configured to issue a pulse discharge instruction when the charge monitoring module detects a trigger pulse discharge condition;

[0155] The discharge control module 113 is used to control the battery to perform pulse discharge, and the discharge current of the pulse discharge is less than a preset discharge current.

[0156] In some embodiments, the discharge control module 113 is further configured to stop the discharge when the discharge duration of the pulse discharge reaches a preset discharge duration.

[0157] In some embodiments, the discharge control module 113 is also used to start timing when the pulse discharge begins; when the discharge duration of the pulse discharge reaches a preset discharge duration, or the timing duration reaches a preset timing duration, the discharge is stopped, and the preset timing duration is less than a preset duration threshold.

[0158] In some embodiments, the discharge request module 112 is used to send a charging request to the charging device when a pulse discharge condition is triggered, and the charging request is used to request the charging device to provide a charging current of 0 amperes; when the charging current provided by the charging device is less than a preset charging current, a pulse discharge instruction is issued.

[0159] In some embodiments, the discharge control module 113 is used to control the battery to discharge to the charging device.

[0160] In some embodiments, the discharge control module 113 is used to control the battery to discharge to the power load of the device where the battery is located.

[0161] In some embodiments, the discharge control module 113 is used to control the battery to discharge to the power load of the device where the battery is located and start timing when it is determined that the battery is in the charging end state, and the discharge current of the pulse discharge is less than the preset discharge current; when the discharge time reaches the preset discharge time, or the timing time reaches the preset timing time, the discharge is stopped to complete the charging process.

[0162] In some embodiments, the preset discharge current comprises 30 amperes.

[0163] In some embodiments, the preset discharge duration is greater than or equal to 10 seconds and less than or equal to 240 seconds.

[0164] In some embodiments, the preset timing duration includes 300 seconds.

[0165] Each module in the above-mentioned battery charging device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in an electronic device in the form of hardware, or can be stored in a memory in the electronic device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0166] In one embodiment, an electronic device is provided. The electronic device may be a terminal, and its internal structure diagram may be as follows: Fig.12 As shown. The electronic device includes a processor, a memory, a communication interface and an input device connected via a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external device in a wired or wireless manner, for example, it can communicate with the other vehicle memory, and the wireless method can be implemented through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a battery charging method is implemented. The input device of the electronic device can be a touch layer covering the display screen, or it can be a button, trackball or touchpad set on the housing of the electronic device, or it can be an external keyboard, touchpad or mouse, etc.

[0167] Those skilled in the art will understand that Fig.12 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0168] In one embodiment, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps of the battery charging method in any of the embodiments described above are implemented.

[0169] In one embodiment, 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 the battery charging method in any of the embodiments described above are implemented.

[0170] In one embodiment, a computer program product or computer program is provided, the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps of the battery charging method of any of the above embodiments.

[0171] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can 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 or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery charging method, characterized in that: The method comprises: During the process of charging the battery by the charging device, monitoring whether a pulse discharge condition is triggered; When the pulse discharge condition is triggered, a pulse discharge instruction is issued; The battery is controlled to perform pulse discharge, and the discharge current of the pulse discharge is less than a preset discharge current.

2. The method according to claim 1, characterized in that The method further comprises: When the discharge duration of the pulse discharge reaches a preset discharge duration, the discharge is stopped.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: starting timing when the pulse discharge begins; The discharging is stopped when the discharge duration of the pulse discharge reaches a preset discharge duration, including: the discharging is stopped when the discharge duration of the pulse discharge reaches a preset discharge duration, or the timing duration reaches a preset timing duration, and the preset timing duration is less than a preset duration threshold.

4. The method according to any one of claims 1 to 3, characterized in that: When the pulse discharge condition is triggered, a pulse discharge instruction is issued, including: When a pulse discharge condition is triggered, a charging request is sent to the charging device, wherein the charging request is used to request the charging device to provide a charging current of 0 amperes; When the charging current provided by the charging device is less than the preset charging current, a pulse discharge instruction is issued.

5. The method according to any one of claims 1 to 4, characterized in that: The controlling the battery to perform pulse discharge comprises: The battery is controlled to discharge to the charging device.

6. The method according to any one of claims 1 to 4, characterized in that: The controlling the battery to perform pulse discharge comprises: The battery is controlled to discharge to the power load of the device where the battery is located.

7. The method according to claim 6, characterized in that The method further comprises: When it is determined that the battery is in the charging end state, the battery is controlled to discharge to the power load of the device where the battery is located, and timing is started, and the discharge current of the pulse discharge is less than the preset discharge current; When the discharge time reaches the preset discharge time, or the timing time reaches the preset timing time, the discharge is stopped and the charging process is completed.

8. The method according to any one of claims 1 to 7, characterized in that: The preset discharge current includes 30 amperes.

9. The method according to any one of claims 2 to 7, characterized in that: The preset discharge time is greater than or equal to 10 seconds and less than or equal to 240 seconds.

10. The method according to any one of claims 3 to 7, characterized in that: The preset timing duration includes 300 seconds.

11. A battery charging device, characterized in that: The device comprises: A charging monitoring module, used to monitor whether a pulse discharge condition is triggered during the process of charging the battery by the charging device; A discharge request module, used to issue a pulse discharge instruction when the charging monitoring module detects a trigger pulse discharge condition; The discharge control module is used to control the battery to perform pulse discharge, wherein the discharge current of the pulse discharge is less than a preset discharge current.

12. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 10 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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