Battery discharge control method, chip, terminal device and system

Abstract

This application discloses a battery discharge control method, chip, terminal device, and system. The method obtains the remaining charge corresponding to the initial charge of the battery during a charge-discharge cycle. Based on the remaining charge, the method updates a cumulative depth of discharge value, such that the cumulative depth of discharge value is based on the historical remaining charge at the initial charge of the battery during the charge-discharge cycle. Subsequently, based on the cumulative depth of discharge value and the number of charge-discharge cycles, the method controls the increase in the battery's discharge cutoff voltage, reduces the battery's deep discharge behavior during subsequent use, ensures battery safety, and maintains the number of charge-discharge cycles, thereby improving battery life and preventing expansion issues.

Description

Technical Field

[0001] The present application relates to the field of battery discharge technology, and in particular to a battery discharge control method, chip, terminal device, and system. Background Art

[0002] As the use of terminal devices in users' daily lives becomes increasingly widespread and important, the need to improve the battery health of these devices is becoming increasingly urgent. In actual applications, as users use the battery and the number of charge and discharge cycles increases, the battery will experience a certain degree of life degradation and swelling. Therefore, in addition to performing fault detection and repair, or even replacing the battery after health issues occur, early management of battery health can also improve battery life degradation and swelling.

[0003] During battery life, deep discharges are inevitable. Repeated deep discharges, in particular, significantly increase the likelihood of battery life degradation and swelling. Therefore, early management of battery health based on deep discharges to mitigate these issues remains a pressing challenge in this field. Summary of the Invention

[0004] The present application provides a battery discharge control method, chip, terminal device and system for improving problems such as life degradation and swelling caused by deep discharge of the battery.

[0005] In a first aspect, embodiments of the present application provide a discharge control method, which may include obtaining the remaining capacity of a battery at the start of a charge-discharge cycle. Based on the remaining capacity, a depth-of-discharge cumulative value is updated, such that the depth-of-discharge cumulative value is based on the historical remaining capacity of the battery at the start of a charge-discharge cycle. Subsequently, based on the depth-of-discharge cumulative value and the number of charge-discharge cycles, the battery's discharge cutoff voltage is controlled to increase, thereby reducing the battery's deep discharge behavior during subsequent use, ensuring battery safety and maintaining the number of charge-discharge cycles, thereby improving battery life and preventing expansion issues.

[0006] The discharge control method in the embodiment of the present application is not only applicable to silicon-based negative electrode lithium batteries, but also to other lithium batteries, sodium ion batteries, lead-acid batteries, nickel-hydrogen batteries, nickel-cadmium batteries, etc., and the present application does not limit this.

[0007] When a battery leaves the factory, it's in peak performance and has a default discharge cutoff voltage. This default discharge cutoff voltage serves as the battery's initial discharge cutoff voltage. To fully utilize the battery's capacity, the initial discharge cutoff voltage is typically greater than or equal to the battery's minimum allowable voltage. Therefore, the increased discharge cutoff voltage is higher than the initial discharge cutoff voltage. Consequently, when the battery experiences another deep discharge, its actual voltage is far from the minimum allowable voltage, preventing further deep discharge.

[0008] Before leaving the factory, terminal devices undergo a series of reliability tests. During these tests, the battery may be charged and discharged. However, this process is not caused by user usage. Therefore, to ensure the accuracy of the subsequent depth of discharge cumulative value, the depth of discharge cumulative value can be set to zero before the terminal device leaves the factory, and the depth of discharge cumulative value refresh process is enabled after the terminal device leaves the factory. Alternatively, when the terminal device is turned on for the first time after leaving the factory, the depth of discharge cumulative value is initialized to zero, so that the depth of discharge cumulative value is based on the remaining charge of the battery at the beginning of the charge and discharge cycle, and is calculated and refreshed from zero.

[0009] In some embodiments, a method for refreshing the deep discharge cumulative value may be, for example, setting a remaining power threshold, refreshing the deep discharge cumulative value based on the relationship between the acquired remaining power and the remaining power threshold, and obtaining a refreshed deep discharge cumulative value.

[0010] In some embodiments, if the acquired remaining power is less than or equal to the remaining power threshold, the deep discharge cumulative value is refreshed based on the principle of adding 1 to the deep discharge cumulative value. If the acquired remaining power is greater than the remaining power threshold, the deep discharge cumulative value does not need to be refreshed.

[0011] In some embodiments, another method for refreshing the deep discharge cumulative value may be to set weights based on the acquired remaining power and using the weights. For example, a mapping relationship may be set, including the remaining power, weights, and the number of discharge behaviors. The mapping relationship is then refreshed based on the mapping relationship and the remaining power to divide the current discharge behavior into different categories, thereby improving the accuracy of the current discharge behavior division. Subsequently, the refreshed deep discharge cumulative value is obtained by combining the weights and the number of discharge behaviors in the refreshed mapping relationship. Deep discharge behaviors can then be identified based on the refreshed deep discharge cumulative value, thereby improving the accuracy of the identified deep discharge behaviors.

[0012] In some embodiments, the mapping relationship may include: a plurality of different set remaining power, and the weight and number of discharge behaviors corresponding to each set remaining power. Based on this, the corresponding target set remaining power can be found from the mapping relationship based on the mapping relationship and the acquired remaining power, so that the current number of discharge behaviors corresponding to the target set remaining power can be found, and then the current number of discharge behaviors is accumulated and added by one to obtain the refreshed number of discharge behaviors, thereby refreshing the mapping relationship. Afterwards, the refreshed deep discharge cumulative value can be obtained based on the number of discharge behaviors and the weight corresponding to each set remaining power in the refreshed mapping relationship. For example, the refreshed deep discharge cumulative value can be obtained based on the sum of the products of the number of discharge behaviors and the weight corresponding to each set remaining power in the updated mapping relationship.

[0013] In some embodiments, to further improve the accuracy of the updated deep discharge cumulative value, the method further includes obtaining the temperature corresponding to the start of charging during the charge-discharge cycle. Based on this, the process of updating the deep discharge cumulative value based on the obtained remaining capacity and using a weighted approach may include updating the deep discharge cumulative value based on the obtained remaining capacity and temperature using a weighted approach. Exemplarily, the mapping relationship may include not only multiple different set remaining capacities, the corresponding weights and number of discharge events for each set remaining capacity, but also multiple different set temperatures. Furthermore, to ensure an accurate correspondence between the set remaining capacities, set temperatures, weights, and number of discharge events, each set remaining capacity is associated with each of the multiple set temperatures, and any set temperature and any set remaining capacity are associated with each other. Corresponding set temperatures and set remaining capacities are then associated with a weight and a number of discharge events. Therefore, based on the mapping relationship and the obtained remaining capacity and temperature, the corresponding target set remaining capacity and target set temperature can be found from the mapping relationship, thereby finding the current number of discharge events corresponding to the target set remaining capacity and target set temperature. The current number of discharge events can then be accumulated and added by one to obtain the updated number of discharge events, thereby completing the process of refreshing the mapping relationship. Then, the refreshed deep discharge cumulative value is obtained based on the number of discharge behaviors and their corresponding weights in the refreshed mapping relationship. For example, the refreshed deep discharge cumulative value can be obtained based on the sum of the products of the number of discharge behaviors and their corresponding weights in the refreshed mapping relationship.

[0014] In some embodiments, at the same set temperature, multiple set remaining capacities may be set to have an increasing trend, and weights corresponding to the multiple set remaining capacities may be set to have a decreasing trend.

[0015] In some embodiments, under the same set remaining power, multiple set temperatures may be set to have an increasing trend, and the weights corresponding to the multiple set temperatures may be set to have an increasing trend.

[0016] In some embodiments, controlling the increase in the discharge cut-off voltage of a battery based on the cumulative value of deep discharge and the number of charge and discharge cycles may include the following process: in response to the number of charge and discharge cycles not satisfying a first preset condition and the cumulative value of deep discharge satisfying a second preset condition, it indicates that during the use of the battery, there is a high probability of problems such as life degradation and expansion caused by deep discharge behavior, so as to control the increase in the discharge cut-off voltage, thereby making the actual voltage of the battery after discharge far away from the minimum voltage allowed by the battery, thereby reducing the deep discharge behavior of the battery during subsequent use, ensuring battery safety and not reducing the number of charge and discharge cycles, and thus improving the battery life and expansion problem.

[0017] In some examples, a depth of discharge adjustment threshold can be set and the refreshed depth of discharge cumulative value can be compared with the depth of discharge adjustment threshold to determine whether the depth of discharge cumulative value meets the second preset condition. If the refreshed depth of discharge cumulative value is greater than or equal to the depth of discharge adjustment threshold, it can be determined that the depth of discharge cumulative value meets the second preset condition. If the refreshed depth of discharge cumulative value is less than the depth of discharge adjustment threshold, it can be determined that the depth of discharge cumulative value does not meet the second preset condition.

[0018] In some embodiments, multiple gradually increasing deep discharge adjustment thresholds can be set. Based on this, the deep discharge adjustment thresholds can include a first deep discharge adjustment threshold and a second deep discharge adjustment threshold, with the second deep discharge adjustment threshold being greater than the first deep discharge adjustment threshold. Controlling the increase in the battery's discharge cutoff voltage can include the following process: when the cumulative deep discharge value is greater than or equal to the first deep discharge adjustment threshold, the discharge cutoff voltage is increased to the first discharge cutoff voltage. Thereafter, when the cumulative deep discharge value is greater than or equal to the second deep discharge adjustment threshold, the discharge cutoff voltage is increased to the second discharge cutoff voltage. With this configuration, by setting a stepped increase in the deep discharge adjustment threshold during battery use, the discharge cutoff voltage can be increased in a stepped manner, further reducing deep discharge behavior in the battery.

[0019] In some embodiments, the difference between the current discharge cut-off voltage and the first discharge cut-off voltage is a first difference, and the difference between the first discharge cut-off voltage and the second discharge cut-off voltage is a second difference. The absolute value of the second difference can be set to be greater than the absolute value of the first difference, thereby increasing the depth of discharge adjustment threshold with an increasing step size. Alternatively, the absolute value of the second difference can be set to be equal to the absolute value of the first difference, thereby increasing the depth of discharge adjustment threshold with the same step size. Alternatively, the absolute value of the second difference can be set to be less than the absolute value of the first difference, thereby increasing the depth of discharge adjustment threshold with a decreasing step size.

[0020] In some embodiments, controlling the battery's discharge cutoff voltage to increase based on the accumulated depth of discharge value and the number of charge-discharge cycles may also include the following process: In response to the number of charge-discharge cycles satisfying a first preset condition, controlling the battery's discharge cutoff voltage to increase. Since the number of charge-discharge cycles satisfies the first preset condition, it can indicate that the battery has been in use for a long time. Long-term use increases the probability of problems such as battery life degradation and swelling. Therefore, controlling the battery's discharge cutoff voltage to increase can improve battery life and reduce swelling.

[0021] Furthermore, when it is determined that the number of charge-discharge cycles is greater than or equal to the cycle threshold, and before the battery's discharge cut-off voltage is controlled to increase, a first page may be displayed on the display panel of the terminal device, allowing the user to select whether to increase the battery's discharge cut-off voltage. Alternatively, the current discharge cut-off voltage may be directly increased without displaying the first page, so that the battery operates based on the increased discharge cut-off voltage.

[0022] In some embodiments, when the accumulated depth of discharge value meets a second preset condition, a first page may be displayed on the display panel of the terminal device before the battery's discharge cutoff voltage is increased. The first page may include indication information indicating whether to increase the battery's discharge cutoff voltage, allowing the user to select whether to increase the battery's discharge cutoff voltage. If the user determines to increase the battery's discharge cutoff voltage, a corresponding confirmation operation is input to the terminal device. The terminal device may, based on the received user confirmation operation, execute the operation of increasing the battery's discharge cutoff voltage. Exemplarily, the indication information on the first page may include a battery optimization control and prompt information. For example, the indication information may include a battery optimization control and prompt information, and the prompt information may inform the user whether to enable battery optimization to increase the battery's discharge cutoff voltage in order to extend the battery's lifespan. Furthermore, the battery optimization control may be used as a trigger. If the user enables the battery optimization control, the terminal device may initiate the operation of increasing the battery's discharge cutoff voltage, so that the battery operates at the increased discharge cutoff voltage. If the user does not enable the battery optimization control, the terminal device may maintain the battery's current discharge cutoff voltage, so that the battery continues to operate at the current discharge cutoff voltage. With this configuration, whether to increase the battery's discharge cut-off voltage can be ultimately determined based on the user's selection. Alternatively, the instruction information may include a selection prompt, for example, selecting yes (or Yes) or no (or No). The user may select yes (or Yes) to control the terminal device to execute the operation process of increasing the battery's discharge cut-off voltage. Of course, the user may also select no (or No) to control the terminal device to continue to maintain the battery's discharge cut-off voltage unchanged.

[0023] Alternatively, when the deep discharge cumulative value meets the second preset condition, the first page may not be displayed, that is, the current discharge cut-off voltage may not be directly increased based on the user's selection, so that the battery operates based on the increased discharge cut-off voltage.

[0024] In a second aspect, an embodiment of the present application further provides a chip, which is used to execute any method in the first aspect of the embodiment of the present application.

[0025] In a third aspect, an embodiment of the present application further provides a terminal device, which includes the chip in the second aspect.

[0026] Fourthly, an embodiment of the present application further provides a server that can receive first and second information about a battery sent by a terminal device. The first information includes the remaining power, voltage, temperature, and current corresponding to the initial charge of the battery during the charge and discharge cycle, and the second information includes the capacity decay and battery fault information of the battery during the charge and discharge cycle. Furthermore, the server can input the first and second information about the battery of the terminal device into a battery deep discharge estimation model and output the risk probability corresponding to the battery of the terminal device. The server compares the terminal device with a risk threshold and, in response to a risk probability greater than or equal to the risk threshold, issues a battery protection instruction to the terminal device so that the terminal device can control the battery's discharge cutoff voltage to increase. With this configuration, a large number of calculation processes can be set on the server side, which can reduce the amount of data calculation on the terminal device side and reduce the power consumption of the terminal device.

[0027] A battery depth of discharge estimation model is established in a server. The training process of the battery depth of discharge estimation model may include the following steps: inputting a battery historical information feature sample set into the battery depth of discharge estimation model. The battery historical information feature sample set includes historical information features and status features of multiple batteries. The historical information features may include information such as the minimum discharge capacity, minimum discharge voltage, discharge temperature, and discharge rate corresponding to the initial charge of the battery during the charge and discharge cycle. The status features may include information such as battery capacity decay and battery fault information during the charge and discharge cycle. The multiple batteries are then grouped using the input battery historical information feature sample set, and the similarity between the historical information features of batteries in the same group is less than a threshold. A characteristic risk function is then generated for each group based on the currently available status feature results (e.g., battery capacity decay and battery fault information). Based on the characteristic risk function, a risk probability is generated. A higher battery capacity decay ratio or a higher number of faults in each group increases the risk probability of the corresponding battery group. When the battery history information feature sample set reaches a credible threshold number, a trained battery depth discharge estimation model can be obtained, and the trained battery depth discharge estimation model can be used as a big data model for battery depth discharge.

[0028] In a fifth aspect, an embodiment of the present application further provides a system comprising a terminal device and a server, wherein the terminal device is configured to send first and second information about a battery in the terminal device to the server; wherein the first information includes at least one of the remaining power, voltage, temperature, and current corresponding to the initial charge of the battery during the charge and discharge cycle, and the second information includes at least one of the battery's capacity attenuation and battery fault information during the charge and discharge cycle. Furthermore, the server is configured to input the first and second information about the battery into a battery deep discharge estimation model, which outputs a risk probability corresponding to the battery. If the risk probability is greater than or equal to a risk threshold, the terminal device is instructed to control the battery's discharge cutoff voltage to increase.

[0029] In some embodiments, the terminal device is also used to: receive a battery maintenance instruction, display a first page on the display panel, and, upon receiving a confirmation operation input by the user, execute control of increasing the discharge cut-off voltage of the battery; wherein the first page includes indication information, and the indication information is used to indicate whether to increase the discharge cut-off voltage of the battery.

[0030] In a sixth aspect, an embodiment of the present application further provides a computer-readable storage medium on which computer program instructions are stored, which, when executed by a processor, implement the steps of the charge and discharge control method provided in the first aspect of the present application, or, when executed by a processor, implement the steps of the charge and discharge control method provided in the first aspect of the present application.

[0031] In the seventh aspect, an embodiment of the present application also provides a computer program product, which includes a computer program that can be executed by a programmable device, and the computer program has a code portion for executing the discharge control method provided in the first aspect of the present application when executed by the programmable device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the hardware structure of a terminal device provided in an embodiment of the present application;

[0033] Figure 2 A schematic flow chart of a battery discharge control method provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the relationship between the remaining power, remaining power threshold, and deep discharge cumulative value of a battery provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the remaining power of a battery provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the mapping relationship provided in the embodiment of the present application;

[0037] Figure 6 Another schematic diagram of the mapping relationship provided in the embodiment of the present application;

[0038] Figure 7 A schematic flow chart of another battery discharge control method provided in an embodiment of the present application;

[0039] Figure 8 Schematic diagram of the deep discharge cumulative value, deep discharge adjustment threshold, and discharge cut-off voltage in an embodiment of the present application;

[0040] Figure 9 A schematic diagram of the first page provided in an embodiment of the present application;

[0041] Figure 10 Schematic diagram of changes in battery parameters before and after the discharge cut-off voltage increases;

[0042] Figure 11A Schematic diagram of the difference in battery voltage under different discharge currents;

[0043] Figure 11B This is a schematic diagram showing the difference in remaining battery capacity at different discharge currents;

[0044] Figure 12 An interaction diagram between a terminal device and a server provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The specific operating methods in the method embodiments can also be applied to device embodiments or system embodiments. It should be noted that in the description of the present application, "multiple" can be understood as "at least two". In addition, it should be understood that in the description of the present application, words such as "first" and "second" are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0046] It should be noted that the same reference numerals in the drawings of this application represent the same or similar structures, and thus their repeated description will be omitted. The words expressing positions and directions described in this application are all explained using the drawings as examples, but they can be modified as needed, and such modifications are included in the scope of protection of this application. The drawings of this application are only for illustrative purposes and do not represent true proportions.

[0047] The discharge control method provided in the embodiments of the present application can be applied to terminal devices with batteries, such as mobile phones, computers, televisions, TV set-top boxes, watches, personal computers (PCs), smart photo frames, wearable devices (such as smart watches, virtual reality (VR) glasses, smart bracelets), indoor and outdoor signs, video game devices, clocks, etc. Of course, the discharge control method provided in the embodiments of the present application can also be applied to other types of electronic devices with batteries, which is not limited here.

[0048] The structure of the above terminal device will be further described below with reference to the accompanying drawings.

[0049] Figure 1 A schematic diagram of the hardware structure of a terminal device provided in an embodiment of the present application is shown. Figure 1 The terminal device 100 may include: a radio frequency (RF) circuit 110, a battery 121, a battery management system (BMS) 122, a charge and discharge management module 123, a processor 130, a memory 140, an input unit 150, a display unit 160, an audio circuit 170, a microphone 171, a speaker 172, a communication interface 180, and a wireless fidelity (Wi-Fi) module 190. Those skilled in the art will understand that Figure 1 The hardware structure of the terminal device 100 shown in the figure does not constitute a limitation on the terminal device 100. The terminal device 100 provided in the embodiment of the present application may include more or fewer components than shown in the figure, may combine two or more components, or may have different component configurations. Figure 1 The various components shown in the drawings may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application specific integrated circuits.

[0050] The following combination Figure 1 The components of the terminal device 100 are described in detail below:

[0051] The RF circuit 110 can be used for receiving and sending data during communication or calls. For example, after receiving downlink data from the base station, the RF circuit 110 sends it to the processor 130 for processing. In addition, the RF circuit 110 can also send uplink data to be sent to the base station. Exemplarily, the RF circuit 110 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc. In addition, the RF circuit 110 can also communicate with other devices through a wireless communication network. Wireless communication can use any communication standard or protocol, including but not limited to the global system of mobile communication (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), long term evolution (LTE), email, short messaging service (SMS), etc.

[0052] Wi-Fi technology is a short-range wireless transmission technology. The terminal device 100 can connect to an access point (AP) through the Wi-Fi module 190 to access the data network. The Wi-Fi module 190 can be used to receive and send data during the communication process.

[0053] The terminal device 100 can be physically connected to other devices through the communication interface 180. For example, the communication interface 180 is connected to the communication interface of the other device through a cable to achieve data transmission between the terminal device 100 and the other device.

[0054] The terminal device 100 can also implement communication services and interact with service-side devices or other terminal devices. Therefore, the terminal device 100 needs to have a data transmission function, that is, the terminal device 100 needs to include a communication module. Figure 1 The communication modules such as the RF circuit 110, the Wi-Fi module 190 and the communication interface 180 are shown, but it is understandable that the terminal device 100 may have at least one of the above components or other communication modules for realizing communication (such as a Bluetooth module) for data transmission. For example, when the terminal device 100 is a mobile phone, the terminal device 100 may include the RF circuit 110, and may also include the Wi-Fi module 190, or may also include a Bluetooth module ( Figure 1When the terminal device 100 is a computer, the terminal device 100 may include a communication interface 180, a Wi-Fi module 190, or a Bluetooth module ( Figure 1 When the terminal device 100 is a tablet computer, the terminal device 100 may include a Wi-Fi module, or may further include a Bluetooth module ( Figure 1 not shown).

[0055] The memory 140 can be used to store computer programs and data. The processor 130 executes various functional applications and data processing of the terminal device 100 by running the computer programs and data stored in the memory 140. Exemplarily, the memory 140 may mainly include a program storage area and a data storage area. Among them, the program storage area can store an operating system (mainly including computer programs or modules corresponding to the kernel layer, system layer, application framework layer and application layer, etc.). Exemplarily, the memory 140 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0056] The input unit 150 can be used to receive editing operations of various different types of data objects such as digital or character information input by the user, and to generate key signal input related to the user settings and function control of the terminal device 100. Exemplarily, the input unit 150 may include a touch panel 151 and other input devices 152. Among them, the touch panel 151 is also called a touch screen, which can collect user touch operations on or near it (such as operations performed by the user using any suitable object or accessory such as a finger, stylus, etc. on or near the touch panel 151) and drive the corresponding connection device according to a pre-set program. In addition, other input devices 152 may include but are not limited to one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, etc.

[0057] The display unit 160 can be used to display information input by the user or information provided to the user and various menus of the terminal device 100. The display unit 160 is the display mode of the terminal device 100, which is used to present the interface and realize human-computer interaction. The display unit 160 may include a display panel 161. Exemplarily, the display panel 161 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc. In some embodiments, the display panel 161 can be implemented by a touch panel 151, that is, the touch panel realizes both touch operation and display operation. In addition, in an embodiment of the present application, the display panel 161 can be used to display the user interface (UI) obtained by the discharge control method provided by the present application, such as displaying the health risks of the battery and promptly reminding the user whether the battery is undergoing health management.

[0058] The processor 130 is the control center of the terminal device 100. It connects various components using various interfaces and lines. By running or executing computer programs and / or modules stored in the memory 140 and calling data stored in the memory 140, it performs various functions of the terminal device 100 and processes data, thereby realizing various services based on the terminal device 100. In the embodiment of the present application, the processor 130 can communicate with the battery management system 122 and the charge and discharge management module 123 to implement the discharge control method provided in the embodiment of the present application. For example, the processor 130 can receive relevant parameters of the battery 121 collected by the battery management system 122 and the charge and discharge management module 123.

[0059] The audio circuit 270, microphone 271 and speaker 272 can provide an audio interface between the user and the terminal device 100. Among them, the audio circuit 170 can be used to convert audio data into a signal that can be recognized by the speaker 172, and transmit the signal to the speaker 172, which is converted into a sound signal for output by the speaker 172. The microphone 171 is used to collect external sound signals (such as the sound of a person speaking or other sounds, etc.), and convert the collected external sound signals into signals that can be recognized by the audio circuit 170 and send them to the audio circuit 170. The audio circuit 170 can also be used to convert the signal sent by the microphone 171 into audio data, and then output the audio data to the RF circuit 110 to send it to, for example, another terminal device, or output the audio data to the memory 140 for subsequent further processing.

[0060] It is worth mentioning that, although not shown, the terminal device 100 may also include at least one sensor, camera, etc., which will not be described in detail here. For example, the at least one sensor may include but is not limited to a pressure sensor, an air pressure sensor, an acceleration sensor, a distance sensor, a fingerprint sensor, a touch sensor, a temperature sensor, a battery sensor system (for example, a voltage sensor, a current sensor, a temperature sensor, and a battery capacity calculation system), etc. The battery sensor system may be provided in the power management system 122 or the charge and discharge management module 123.

[0061] The battery 121 is used to supply power to various components in the terminal device 100. Exemplarily, the battery 121 can be logically connected to the processor 130 or other components that require power through the power management system (Battery Management System, BMS) 122, and the discharge of the battery 121 is managed by the power management system 122 to supply power to various components. Exemplarily, the charge and discharge management module 123 is connected to the battery 121, and the charge and discharge management module 123 is used to receive charging input from the charger to charge the battery 121. In addition, the charge and discharge management module 123 can also control the discharge of the battery 121 to supply power to other electronic devices (such as terminal devices), so that the terminal device 100 in this application can also use its own battery 121 to reversely supply power to other electronic devices (such as terminal devices).

[0062] The batteries currently used in terminal devices are generally lithium batteries, which mainly include a positive electrode, a negative electrode, an electrolyte, a shell, and other parts. At present, the negative electrode material generally used for lithium ions is graphite. However, silicon-based negative electrode batteries that use silicon-based negative electrode materials (such as nano-silicon carbon, silicon dioxide (SiO), and new silicon-carbon negative electrodes) to form the negative electrode have higher battery energy density than graphite negative electrode batteries that use graphite to form the negative electrode, thereby achieving an increase in battery capacity under the same conditions. In addition, the materials for the positive electrode, separator, and electrolyte can be materials well known to those skilled in the art and are not limited here.

[0063] During the use of lithium batteries, they will be charged and discharged. However, different users have different battery usage habits, mainly including two types of users: ordinary users and heavy users. For example, ordinary users are more caring for the battery when using it. In most cases, they can make the battery work in a good usage scenario. In very rare cases, they will make the battery work in a heavy usage scenario, so that the probability of the battery having problems such as life decay and swelling in the short term is very small. In the process of using the battery, heavy users often make the battery work in a heavy usage scenario, so that the probability of the battery having problems such as life decay and swelling in the short term is very high. Among them, heavy usage scenarios include: scenarios where the battery is discharged to a lower state and then charged.

[0064] Therefore, for lithium battery products, if ordinary users and heavy users can be identified, different management strategies can be adopted for the batteries of users with different usage habits, and safety protection can be provided before battery expansion and capacity decay occur, thereby preventing battery failure.

[0065] At present, although there is an early management of lithium battery health based on the number of lithium battery charge and discharge cycles to improve the problems of lithium battery life attenuation and swelling, these methods do not take into account the impact of the depth of discharge (DOD) on the life and expansion of lithium batteries. Among them, DOD represents the percentage of the battery discharge capacity to the rated capacity of the battery. For example, the actual voltage of the battery stops charging when it is charged to the charge cut-off voltage. At this time, the remaining capacity (State of charge, SOC value) of the battery is 100%. The actual voltage of the battery stops discharging when it is discharged to the discharge cut-off voltage, causing the terminal device to enter sleep or shut down. At this time, the SOC value of the battery is 0%. The battery starts to discharge from the charge cut-off voltage to the discharge cut-off voltage. The total amount of electricity discharged this time is defined as 100%. Then 90% DOD means that 90% of the electricity is discharged.

[0066] Since the higher the DOD, the more electricity can be released in a single discharge, however, as the DOD increases, the micron-sized active materials of the positive and negative electrode materials will break and scatter, resulting in a decrease in lithium ion life, and this is generally considered to be the reason for the rapid decline in lithium battery life. In addition, as the DOD increases, the lithium ion active materials are more likely to crack during the charge and discharge cycle, exposing the surface of the fresh active material to the electrolyte and causing a series of side reactions. Especially for silicon-based negative electrode lithium batteries, after the DOD reaches a deep discharge state, during the process of lithium insertion / delithiation, silicon will experience severe volume expansion (about 300%), destroying the electronic contact between particles, thereby causing a more significant decline in the cycle performance of silicon-based negative electrode lithium batteries.

[0067] To this end, an embodiment of the present application provides a discharge control method for a battery, which is used to achieve discharge control of batteries such as silicon-based negative electrode lithium batteries. When the present application is implemented, based on the remaining power of the battery at the start of charging, the deep discharge cumulative value is refreshed, and according to the deep discharge cumulative value and the number of charge and discharge cycles, the discharge cut-off voltage of the battery is controlled to increase, and the deep discharge behavior of the battery during subsequent use is reduced, thereby ensuring battery safety and the number of charge and discharge cycles. This can improve battery life and expansion problems. It can be understood that the discharge control method in the embodiment of the present application is not only applicable to silicon-based negative electrode lithium batteries, but also to other lithium batteries, sodium ion batteries, lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, etc., and the present application does not limit this.

[0068] For ease of understanding, multiple scenarios that may be involved in the method provided by this application are introduced in conjunction with the embodiments and drawings. It is understood that the method provided by the embodiments of this application is not limited to the various scenarios introduced below.

[0069] Application Scenario 1: The discharge control method in the embodiment of the present application is stored in the terminal device. That is, the relevant computer program or pre-stored mapping relationship and other information used to implement the discharge control method provided in the embodiment of the present application is stored in the terminal device 100. For example, it can be stored in the processor of the power management system 122 or the charge and discharge management module 123. The processor of the power management system 122 or the charge and discharge management module 123 can execute the process of a battery discharge control method provided in the embodiment of the present application.

[0070] Figure 2 The following is a flow chart of a method for controlling battery discharge according to an embodiment of the present application. The method can be applied to a terminal device and includes at least the following steps:

[0071] S110: Obtain the remaining capacity of the battery corresponding to the initial charge in the charge and discharge cycle. During use, the battery undergoes multiple charge and discharge cycles, where a charge and discharge cycle refers to a continuous process of one charge and one discharge. The remaining capacity thus obtained is the data collected when the battery is initially charged in the current charge and discharge cycle. Of course, since the remaining capacity of the battery decreases as the battery discharges, the remaining capacity thus obtained may also represent the lowest value reached during the discharge process of the battery in the previous charge and discharge cycle. Exemplarily, an existing sensor in the power management system 122 or the charge and discharge management module 123, or a separate sensor system, is used to collect the remaining capacity corresponding to the initial charge of the battery in the charge and discharge cycle, and the collected remaining capacity is sent to a processor in the power management system 122 or the charge and discharge management module 123, so that the processor in the power management system 122 or the charge and discharge management module 123 can obtain the remaining capacity. With this arrangement, the remaining power corresponding to the initial charging of the battery in the charge and discharge cycle can be collected using the power management system 122 or the existing sensors in the charge and discharge management module 123 in the terminal device, or a separate sensor system, thereby eliminating the need to set up additional circuits and sensors and avoiding increased costs.

[0072] Furthermore, in actual applications, when a user is charging a battery, in some cases, the user may unplug the charger after plugging it in for a short time. Based on this, in the current charge-discharge cycle, if the time from when the battery starts charging when the charger is plugged in to when the battery stops charging when the charger is unplugged is greater than the time threshold, the remaining power corresponding to the start of the current charge-discharge cycle is used as the remaining power to be obtained in step S110. The time threshold can be 5 minutes, 10 minutes, 15 minutes, 20 minutes, etc. Of course, different application scenarios have different requirements for the time threshold, so the specific value of the time threshold can be set according to the requirements of the actual application scenario and is not limited here.

[0073] S120. Refresh the deep discharge cumulative value based on the acquired remaining power to obtain a refreshed deep discharge cumulative value, such that the deep discharge cumulative value is obtained based on the historical remaining power of the battery at the start of a charge / discharge cycle. Furthermore, a higher deep discharge cumulative value indicates that the battery has been deeply discharged more frequently during historical use. Therefore, the deep discharge cumulative value can be used to indicate the extent to which the battery has been deeply discharged.

[0074] Before leaving the factory, terminal devices undergo a series of reliability tests. During these tests, the battery may be charged and discharged. However, this process is not caused by user usage. Therefore, to ensure the accuracy of the subsequent depth of discharge cumulative value, the depth of discharge cumulative value can be set to zero before the terminal device leaves the factory, and the depth of discharge cumulative value refresh process is enabled after the terminal device leaves the factory. Alternatively, when the terminal device is turned on for the first time after leaving the factory, the depth of discharge cumulative value is initialized to zero, so that the depth of discharge cumulative value is based on the remaining charge of the battery at the beginning of the charge and discharge cycle, and is calculated and refreshed from zero.

[0075] In some examples, one method for refreshing the deep discharge cumulative value may be to set a remaining power threshold and, based on the relationship between the acquired remaining power and the remaining power threshold Sth, refresh the deep discharge cumulative value to obtain a refreshed deep discharge cumulative value. For example, if the acquired remaining power is less than or equal to the remaining power threshold Sth, the deep discharge cumulative value is refreshed based on the principle of incrementing the deep discharge cumulative value by one. If the acquired remaining power is greater than the remaining power threshold Sth, the deep discharge cumulative value does not need to be refreshed. Here, Sth > 0%, and there is a certain difference between Sth and 0%, for example, the difference can be 0.5%, 1%, 2%, 5%, 10%, etc. Exemplarily, Sth can be a fixed value, or it can increase as the discharge cutoff voltage increases. It is understood that in actual applications, different application scenarios have different requirements for Sth. Therefore, the specific value of Sth can be determined based on the needs of the actual application scenario and is not limited here.

[0076] The following describes the process of refreshing the deep discharge cumulative value based on the remaining power and the remaining power threshold with reference to the accompanying drawings and specific embodiments.

[0077] Figure 3 A schematic diagram showing the relationship between the remaining power, remaining power threshold and deep discharge cumulative value of the battery provided in the embodiment of the present application is shown. Figure 3 , with a charge and discharge cycle F q-1 ~F q+2 For example, SL represents the remaining power of the battery in the charge and discharge cycle, and Sth represents the remaining power threshold. q-1 ~F q+2 In the example, the remaining capacity of the battery first increases during the charging process and then decreases during the discharging process. Here, q and m are integers greater than 0.

[0078] Specifically, during the charge and discharge cycle F q-1 Previously, the corresponding current depth of discharge cumulative value was SD m-1 .

[0079] During the charge and discharge cycle F q-1 The remaining power of the battery when it starts charging is Sm q-1 , due to Sm q-1 ≤Sth, indicating that the battery is in the charge and discharge cycle F q-1 The DOD in the previous charge and discharge cycle was high, reaching the deep discharge state, that is, the battery has a deep discharge behavior, then the current deep discharge cumulative value SD is refreshed m-1 and the current depth discharge cumulative value SD m-1Add one to get the refreshed depth discharge cumulative value SD m , and SD m =SD m-1 +1.

[0080] During the charge and discharge cycle F q The remaining power of the battery when it starts charging is Sm q , due to Sm q >Sth, the current depth discharge cumulative value SD will not be refreshed m , that is, the accumulated value of deep discharge is kept as SD m .

[0081] During the charge and discharge cycle F q+1 The remaining power of the battery when it starts charging is Sm q+1 , due to Sm q+1 >Sth, the accumulated value of deep discharge continues to be SD m .

[0082] During the charge and discharge cycle F q+2 The remaining power of the battery when it starts charging is Sm q+2 , due to Sm q+2 ≤Sth, indicating that the battery is in the charge and discharge cycle F q+1 The DOD in the battery is high and reaches the deep discharge state, that is, the battery has a deep discharge behavior again, then the current deep discharge cumulative value SD is refreshed. m and the current depth discharge cumulative value SD m The count is increased by one to obtain the refreshed depth discharge cumulative value SD m+1 , and SD m+1 =SD m +1.

[0083] In summary, based on multiple charge and discharge cycles of the battery, a cumulative counting method can be adopted. As long as the remaining power corresponding to the initial charge of the battery in a certain charge and discharge cycle meets the requirement that the remaining power corresponding to the initial charge of the battery is less than or equal to the remaining power threshold, the current deep discharge cumulative value can be accumulated once to obtain a refreshed deep discharge cumulative value. This also realizes the statistical process of the deep discharge cumulative damage of the battery based on the deep discharge state of the battery in the charge and discharge cycle.

[0084] In some other examples, another method for obtaining a refreshed deep discharge cumulative value can be to refresh the deep discharge cumulative value based on the acquired remaining power and using a weighted method. For example, by setting a mapping relationship, the mapping relationship includes setting the remaining power, the weight, and the number of discharge behaviors, and refreshing the mapping relationship based on the mapping relationship and the remaining power to divide the current discharge behavior and improve the accuracy of the current discharge behavior division. Thereafter, the refreshed deep discharge cumulative value is obtained by combining the weight and the number of discharge behaviors in the refreshed mapping relationship. Thus, deep discharge behavior can be identified based on the refreshed deep discharge cumulative value, thereby improving the accuracy of the identified deep discharge behavior.

[0085] The following describes the process of refreshing the deep discharge cumulative value based on the remaining power and the mapping relationship with reference to the accompanying drawings and specific implementations.

[0086] Implementation method one:

[0087] The mapping relationship may include: multiple different set remaining power, and the weight and number of discharge behaviors corresponding to each set remaining power. Based on this, the corresponding target set remaining power can be found from the mapping relationship based on the mapping relationship and the obtained remaining power, so that the current number of discharge behaviors corresponding to the target set remaining power can be found, and then the current number of discharge behaviors is accumulated and added by one to obtain the refreshed number of discharge behaviors, thereby refreshing the mapping relationship. Afterwards, the refreshed deep discharge cumulative value can be obtained based on the number of discharge behaviors and the weight corresponding to each set remaining power in the refreshed mapping relationship. For example, the refreshed deep discharge cumulative value can be obtained based on the sum of the products of the number of discharge behaviors and the weight corresponding to each set remaining power in the updated mapping relationship.

[0088] In practical applications, a higher depth of discharge (DOD) has a greater impact on battery life and expansion. Therefore, different weights can be assigned to different set remaining capacities, distinguishing between different battery discharge states and distinguishing between differences in the degree of damage to the battery caused by different DODs. This, in turn, improves the accuracy of the updated DOD cumulative value. For example, if the DOD corresponding to the initial charge of the battery during the current charge-discharge cycle is 25%, this indicates that the DOD is not particularly high, and therefore, the damage caused by this discharge is relatively low. Therefore, the corresponding weight can be set lower. If the DOD corresponding to the initial charge of the battery during the current charge-discharge cycle is 0%, this indicates that the DOD is relatively high, and therefore, the damage caused by this discharge is relatively high. Therefore, the corresponding weight can be set higher. Based on this, the values of the different set remaining capacities in the mapping relationship can be increased, while the weights corresponding to the different set remaining capacities can be decreased. Furthermore, the minimum value of the different set remaining capacities can be greater than or equal to 0%, and the maximum value of the different set remaining capacities can be greater than or equal to 100%. Also, the minimum value of the weight is greater than or equal to 0, and this application does not limit the maximum value of the weight. For example, the maximum value of the weight is less than or equal to 1, 1.1, 1.2, 2 or other values.

[0089] Reference Figure 4 and Figure 5 , Figure 4 A schematic diagram showing the remaining power of a battery provided in an embodiment of the present application is shown. Figure 5 A schematic diagram of the mapping relationship provided by the embodiment of the present application is shown, where SL represents the remaining power of the battery in the charge and discharge cycle. b-2 ~F b+2 For example, in the charge and discharge cycle F b-2 Previously, the refreshed mapping relationship was the x-1th mapping relationship. Based on the sum of the product of the number of discharge behaviors and the weight corresponding to each set remaining power in the x-1th mapping relationship, the refreshed deep discharge cumulative value SD was obtained. x-1 , and SD x-1 =1*8+0.8*6+0.5*3+0.3*5+0.1*2+0*10=16. Wherein, b and x are integers greater than 0.

[0090] During the charge and discharge cycle F b-2 The remaining power of the battery when it starts charging is Sm b-2 , based on Sm b-2 In the x-1th mapping relationship, the corresponding target set remaining power is not found, so there is no need to refresh the number of discharge behaviors in the x-1th mapping relationship.

[0091] During the charge and discharge cycle F b-1 The remaining power of the battery when it starts charging is Sm b-1 , based on Sm b-1 In the x-1th mapping relationship, the corresponding target setting remaining power is 10%, and the number of discharge behaviors corresponding to 10% in the x-1th mapping relationship is accumulated and added by one, that is, one is added on the basis of 3, to obtain the xth mapping relationship, and the number of discharge behaviors corresponding to 10% in the xth mapping relationship is 4. Therefore, based on the sum of the product of the number of discharge behaviors corresponding to each set remaining power in the xth mapping relationship and the weight, the refreshed deep discharge cumulative value SD can be obtained. x , and SD x =1*8+0.8*6+0.5*4+0.3*5+0.1*2+0*10=16.5.

[0092] During the charge and discharge cycle F b The remaining power of the battery when it starts charging is Sm b , based on Sm b In the xth mapping relationship, the corresponding target set remaining power is not found, so there is no need to refresh the number of discharge behaviors in the x-1th mapping relationship.

[0093] During the charge and discharge cycle F b+1 The remaining power of the battery when it starts charging is Sm b+1 , based on Sm b+1 In the xth mapping relationship, the corresponding target set remaining power is not found, so there is no need to refresh the number of discharge behaviors in the x-1th mapping relationship.

[0094] During the charge and discharge cycle F b+2 The remaining power of the battery when it starts charging is Sm b+2 , based on Sm b+2 In the xth mapping relationship, the corresponding target setting remaining power is found to be 0%, and the number of discharge behaviors corresponding to 0% in the xth mapping relationship is accumulated and added by one, that is, one is added on the basis of 8, to obtain the x+1th mapping relationship, and the number of discharge behaviors corresponding to 0% in the x+1th mapping relationship is 9. Therefore, based on the sum of the product of the number of discharge behaviors corresponding to each set remaining power in the x+1th mapping relationship and the weight, the refreshed deep discharge cumulative value SD can be obtained. x+1 , and SD x+1 =1*9+0.8*6+0.5*4+0.3*5+0.1*2+0*10=17.5.

[0095] It is worth mentioning that Figure 5The specific values shown are only for reference and are not intended to limit the specific values of the remaining power, weight, and number of discharge behaviors set in the mapping relationship provided in the embodiment of the present application. The specific values of the remaining power, weight, and number of discharge behaviors set in the mapping relationship in actual applications can be determined according to the requirements of the actual application scenario.

[0096] Implementation method 2:

[0097] In step S110, not only is the battery's remaining capacity corresponding to the initial charge of the charge-discharge cycle acquired, but the battery's temperature corresponding to the initial charge of the charge-discharge cycle is also acquired via a temperature sensor. This allows the accumulated depth of discharge value to be updated based on the acquired remaining capacity and temperature using a weighted approach. For example, the mapping relationship may include not only multiple different set remaining capacities, the weights corresponding to each set remaining capacity, and the number of discharge events, but also multiple different set temperatures. Furthermore, to ensure an accurate correspondence between the set remaining capacity, set temperature, weight, and number of discharge events, each set remaining capacity is associated with each of the multiple set temperatures, and any set temperature is associated with any set remaining capacity. Corresponding set temperatures and set remaining capacities are then associated with a weight and a number of discharge events. Therefore, based on this mapping relationship and the acquired remaining capacity and temperature, the corresponding target set remaining capacity and target set temperature can be found from the mapping relationship, thereby finding the current number of discharge events corresponding to the target set remaining capacity and target set temperature. The current number of discharge events can then be accumulated and incremented by one to obtain the updated number of discharge events, thereby completing the process of refreshing the mapping relationship. Then, the refreshed deep discharge cumulative value is obtained based on the number of discharge behaviors and their corresponding weights in the refreshed mapping relationship. For example, the refreshed deep discharge cumulative value can be obtained based on the sum of the products of the number of discharge behaviors and their corresponding weights in the refreshed mapping relationship.

[0098] Moreover, the multiple set temperatures may all be temperature values below 0°C, or may all be temperature values above 0°C, or may have both temperature values below 0°C and temperature values above 0°C. Of course, the specific values of the set temperatures can be determined according to the needs of the actual application scenario and are not limited here. Also, the minimum value of the weight is greater than or equal to 0, and this application does not limit the maximum value of the weight. For example, the maximum value of the weight is less than or equal to 1, 1.1, 1.2, 2 or other values. Furthermore, in order to improve the accuracy of the discharge behavior division, the multiple set remaining capacities corresponding to the same set temperature may show an increasing trend, and the weights corresponding to the multiple set remaining capacities may show a decreasing trend. Furthermore, in order to further improve the accuracy of the discharge behavior division, the multiple set temperatures corresponding to the same set remaining capacities may show an increasing trend, and the weights corresponding to the multiple set temperatures may show an increasing trend.

[0099] Furthermore, in practical applications, a higher depth of discharge (DOD) has a greater impact on battery life and expansion. Furthermore, the actual capacity that can be discharged by a battery varies at different temperatures. Therefore, in embodiments of the present application, the acquired remaining capacity is divided not only based on the set remaining capacity, but also based on the set temperature. This allows for more detailed differentiation of discharge behavior, enabling a more detailed distinction between the differences in battery damage caused by different DODs, thereby further improving the accuracy of the updated DOD cumulative value. For example, if the temperature corresponding to the start of charging at the battery is -25°C during the current charge-discharge cycle, and the remaining capacity at the start of charging is 5%, although the battery's remaining capacity is low, the battery's inherent capacity decreases at low temperatures, resulting in less capacity being discharged when discharged to 5% remaining capacity compared to at 25°C. When the battery temperature returns to 25°C, the remaining capacity of the battery increases. Therefore, the remaining capacity of the battery at this DOD is low, but this does not fully indicate a high DOD during this discharge. Therefore, the corresponding weight can be set lower. Conversely, the weight can be set higher.

[0100] Reference Figure 4 and Figure 6 , Figure 6 Another schematic diagram of the mapping relationship provided by the embodiment of the present application is shown, with the charge and discharge cycle period F b-2 ~F b+2 For example, in the charge and discharge cycle F b-2 Previously, the refreshed mapping relationship was the z-1th mapping relationship. Based on the sum of the product of the number of discharge behaviors and their corresponding weights in the z-1th mapping relationship, the refreshed deep discharge cumulative value SD was obtained. z-1 , and SD z-1 =A1z-1 +A2 z-1 +A3 z-1 +A4 z-1 =29.1. Moreover, z and b are integers greater than 0.

[0101] Among them, A1 z-1 =0.8*1+0.5*3+0.3*2+0.2*4+0.1*7+0*6=4.4, A2 z-1 =1*2+0.8*1+0.5*5+0.3*3+0.2*1+0*3=6.4, A3 z-1 =1*4+0.8*2+0.5*5+0.3*1+0.2*6+0.1*3=9.9, A4 z-1 =1*1+0.8*5+0.5*4+0.3*3+0.2*2+0.1*1=8.4.

[0102] During the charge and discharge cycle F b-2 The remaining power of the battery at the start of charging is Sm b-2 , temperature is Tm b-2 , based on Sm b-2 and Tm b-2 In the z-1th mapping relationship, the corresponding target set remaining power and target set temperature are not found, so there is no need to refresh the number of discharge behaviors in the z-1th mapping relationship.

[0103] During the charge and discharge cycle F b-1 The remaining power of the battery at the start of charging is Sm b-1 , temperature is Tm b-1 , based on Sm b-1 and temperature value Tm b-1 , we can find the corresponding target setting of 10% remaining power and 25°C in the z-1th mapping relationship, and add one to the number of discharge behaviors corresponding to 10% and 25°C in the z-1th mapping relationship, that is, add one to 2 to get the zth mapping relationship. The number of discharge behaviors corresponding to 10% and 25°C in the zth mapping relationship is 3. Therefore, based on the sum of the product of the number of discharge behaviors and their corresponding weights in the zth mapping relationship, we can get the refreshed deep discharge cumulative value SD. z , and SD z =A1 z +A2 z +A3 z +A4 z =29.6.

[0104] Among them, A1 z=0.8*1+0.5*3+0.3*2+0.2*4+0.1*7+0*6=4.4, A2 z =1*2+0.8*1+0.5*5+0.3*3+0.2*1+0*3=6.4, A3 z =1*4+0.8*2+0.5*6+0.3*1+0.2*6+0.1*3=10.4, A4 z =1*1+0.8*5+0.5*4+0.3*3+0.2*2+0.1*1=8.4.

[0105] During the charge and discharge cycle F b The remaining power of the battery at the start of charging is Sm b , temperature is Tm b , based on Sm b and temperature value Tm b In the z-th mapping relationship, the corresponding target set remaining power and target set temperature are not found, so there is no need to refresh the number of discharge behaviors in the z-1-th mapping relationship.

[0106] During the charge and discharge cycle F b+1 The remaining power of the battery at the start of charging is Sm b+1 , temperature is Tm b+1 , based on Sm b+1 In the zth mapping relationship, no corresponding target set remaining power and target set temperature are found, so there is no need to refresh the number of discharge behaviors in the z-1th mapping relationship.

[0107] During the charge and discharge cycle F b+2 The remaining power of the battery at the start of charging is Sm b+2 , temperature is Tm b+2 , based on Sm b+2 In the zth mapping relationship, the corresponding target setting remaining power is 0%, and the corresponding target setting temperature is 25°C. The number of discharge behaviors corresponding to 0% and 25°C in the zth mapping relationship is accumulated and added by one, that is, one is added on the basis of 4, to obtain the z+1th mapping relationship, and the number of discharge behaviors of 0% and 25°C in the z+1th mapping relationship is 5. Therefore, based on the sum of the product of the number of each discharge behavior cycle and its corresponding weight in the z+1th mapping relationship, the refreshed deep discharge cumulative value SD can be obtained. z+1 , and SD z+1 =A1 z+1 +A2 z+1 +A3 z+1 +A4 z+1 =30.6.

[0108] Among them, A1 z+1 =0.8*1+0.5*3+0.3*2+0.2*4+0.1*7+0*6=4.4, A2 z+1 =1*2+0.8*1+0.5*5+0.3*3+0.2*1+0*3=6.4, A3 z+1 =1*5+0.8*2+0.5*6+0.3*1+0.2*6+0.1*3=11.4, A4 z+1 =1*1+0.8*5+0.5*4+0.3*3+0.2*2+0.1*1=8.4.

[0109] It is worth mentioning that the obtained battery temperature value can be the temperature value of the battery itself. Figure 6 The specific values shown are only for reference and are not intended to limit the specific values of the set remaining power, set temperature, weight, and number of discharge behaviors in the mapping relationship provided in the embodiment of the present application. The specific values of the set remaining power, set temperature, weight, and number of discharge behaviors in the mapping relationship in actual applications can be determined according to the requirements of the actual application scenario.

[0110] S130. Through the above example, the deep discharge cumulative value can be refreshed, so that the deep discharge cumulative value and the number of charge and discharge cycles can be combined with each other, and then the discharge cut-off voltage of the battery can be jointly controlled according to the refreshed deep discharge cumulative value and the number of charge and discharge cycles. With this setting, the actual minimum voltage of the battery after discharge can be kept away from the minimum voltage allowed by the battery, so as to reduce the deep discharge behavior of the battery during subsequent use, ensure battery safety and the number of charge and discharge cycles is not reduced, and thus improve battery life and expansion problems. In addition, it can also solve the battery risk caused by deep discharge behavior that cannot be covered by methods such as relying solely on the number of battery charge and discharge cycles. In addition, it is worth mentioning that the number of charge and discharge cycles refers to a cycle between full charge and full discharge that the battery can complete during use, and the number of charge and discharge cycles is accumulated by one for each cycle.

[0111] It is understandable that when the terminal device leaves the factory, the battery is in a relatively good performance state, and at this time the battery has a default discharge cut-off voltage. This default discharge cut-off voltage can be used as the initial discharge cut-off voltage of the battery, and in order to fully utilize the battery capacity, the initial discharge cut-off voltage is usually greater than or equal to the minimum voltage allowed by the battery. In step S130, the increased discharge cut-off voltage is higher than the initial discharge cut-off voltage. Based on this, when the battery is deeply discharged again, the actual voltage of the battery is far from the minimum voltage allowed by the battery, thereby preventing the battery from further deep discharge.

[0112] In specific implementation, the first preset condition and the second preset condition can be set, and then combined with the number of charge and discharge cycles and the accumulated value of deep discharge, to determine whether to control the discharge cut-off voltage of the battery to increase. Figure 7 , Figure 7 The following is a flow chart illustrating another method for controlling discharge of a battery provided in an embodiment of the present application. Step S130 may include:

[0113] S131. Determine whether the number of charge and discharge cycles meets a first preset condition. If not, this indicates that the battery has been in use for a short time, and the probability of problems such as life degradation and swelling due to long-term use is low. Step S132 is then executed to determine the extent to which the battery has been in a deep discharge state based on the accumulated deep discharge value, thereby determining whether there is a high probability of problems such as life degradation and swelling due to deep discharge. If so, this indicates that the battery has been in use for a long time, and the probability of problems such as life degradation and swelling due to long-term use is high. Step S134 is then executed to increase the battery's discharge cutoff voltage to improve battery life and reduce swelling.

[0114] In some examples, a cycle number threshold can be set and the charge and discharge cycle number can be compared with the cycle number threshold to determine whether the charge and discharge cycle number meets the first preset condition. If the charge and discharge cycle number is greater than or equal to the cycle number threshold, it can be said that the charge and discharge cycle number meets the first preset condition. If the charge and discharge cycle number is less than the cycle number threshold, it can be said that the charge and discharge cycle number does not meet the first preset condition. In addition, the cycle number threshold can be 300 laps, 350 laps, 400 laps, etc. Of course, different application scenarios have different requirements for the cycle number threshold, so the specific value of the cycle number threshold can be set according to the needs of the actual application scenario and is not limited here.

[0115] S132: Determine whether the accumulated deep discharge value meets a second preset condition. If so, it indicates that the probability of problems such as life degradation and expansion caused by deep discharge during battery use is high. Then, step S133 is executed to control the discharge cut-off voltage to increase, so that the actual voltage of the battery after discharge is away from the minimum voltage allowed by the battery. This reduces deep discharge during subsequent use of the battery, ensures battery safety and does not reduce the number of charge and discharge cycles, thereby improving battery life and reducing expansion. If not, it indicates that the probability of problems such as life degradation and expansion caused by deep discharge during battery use is low. Then, step S134 is executed to maintain the current discharge cut-off voltage unchanged.

[0116] In some examples, by setting a deep discharge adjustment threshold, the refreshed deep discharge cumulative value can be compared with the deep discharge adjustment threshold to determine whether the deep discharge cumulative value meets the second preset condition. Among them, if the refreshed deep discharge cumulative value is greater than or equal to the deep discharge adjustment threshold, it can be indicated that the deep discharge cumulative value meets the second preset condition. If the refreshed deep discharge cumulative value is less than the deep discharge adjustment threshold, it can be indicated that the deep discharge cumulative value does not meet the second preset condition. Moreover, the deep discharge adjustment threshold can be 50, 80, etc. Of course, the requirements for the deep discharge adjustment threshold in different application scenarios are different. Therefore, the specific value of the deep discharge adjustment threshold can be set according to the requirements of the actual application scenario and is not limited here.

[0117] S133. Since the number of charge-discharge cycles does not meet the first preset condition and the deep discharge cumulative value meets the second preset condition, it can be shown that during the user's use of the battery, the battery usually operates in a heavy-use scenario, which increases the probability of problems such as battery life attenuation and swelling in the short term. Thus, heavy users can be identified. Therefore, the discharge cut-off voltage of the battery can be controlled to increase to reduce the deep discharge behavior of the battery during use, ensure the safety of the battery and the number of charge-discharge cycles does not decrease, and further improve the battery life and swelling problems.

[0118] Exemplarily, multiple deep discharge adjustment thresholds that gradually increase in value can be set. For example, referring to Figure 8 , Figure 8 FIG. shows a schematic diagram of the deep discharge cumulative value, the deep discharge adjustment threshold, and the discharge cut-off voltage in the embodiments of the present application. The set deep discharge adjustment threshold can include a first deep discharge adjustment threshold SDth1 and a second deep discharge adjustment threshold SDth2, and SDth2 > SDth1. And, taking the deep discharge cumulative value SD z-3 ~SD z+2 as an example, SD z-3 < SDth1, keep the current discharge cut-off voltage VDC1 unchanged. SD z-2 < SDth1, continue to keep the current discharge cut-off voltage VDC1 unchanged. SD z-1 ≥ SDth1, raise the current discharge cut-off voltage VDC1 by a certain voltage value |ΔV1| to obtain the increased discharge cut-off voltage (i.e., the first discharge cut-off voltage) VDC2, and VDC2 = VDC1 + |ΔV1|. After that, SD z ~SD z+1 are all greater than SDth1 and less than SDth2, continue to keep the first discharge cut-off voltage VDC2 unchanged. After that, SD z+2≥SDth2, the first discharge cut-off voltage VDC2 is increased by a certain voltage value |ΔV2| to obtain the increased discharge cut-off voltage (i.e., the second discharge cut-off voltage) VDC3, and VDC3 = VDC2 + |ΔV2|. This configuration allows the discharge cut-off voltage to be increased in a step-by-step manner during battery use by setting a step-by-step increase in the deep discharge adjustment threshold, further reducing deep discharge behavior.

[0119] Furthermore, ΔV1 represents a first difference between the current discharge cutoff voltage and the first discharge cutoff voltage, and ΔV2 represents a second difference between the first discharge cutoff voltage and the second discharge cutoff voltage. The depth of discharge adjustment threshold can be increased by the same step size by setting |ΔV2| = |ΔV1|. Alternatively, the depth of discharge adjustment threshold can be increased by an increasing step size by setting |ΔV2| > |ΔV1|. Alternatively, the depth of discharge adjustment threshold can be increased by a decreasing step size by setting |ΔV2| < |ΔV1|.

[0120] It is understood that in actual applications, two, three, four, or more gradually increasing depth of discharge adjustment thresholds may be set, wherein any two numerically adjacent depth of discharge adjustment thresholds satisfy the aforementioned relationship between the first depth of discharge adjustment threshold SDth1 and the second depth of discharge adjustment threshold SDth2. The details are not further described herein. Of course, in actual applications, a single depth of discharge adjustment threshold may also be set, in which case the relationship between the first depth of discharge adjustment threshold SDth1 is sufficient. The details are not further described herein.

[0121] In one embodiment of the present application, when the accumulated value of deep discharge meets the second preset condition, a first page can also be displayed on the display panel of the terminal device before controlling the battery's discharge cut-off voltage to increase. The first page may include instruction information, which is used to indicate whether to increase the battery's discharge cut-off voltage, so that the user can choose whether to increase the battery's discharge cut-off voltage. If the user determines to increase the battery's discharge cut-off voltage, a corresponding confirmation operation will be input to the terminal device. The terminal device can execute the operation process of controlling the battery's discharge cut-off voltage to increase based on the confirmation operation received from the user input. Exemplarily, the instruction information in the first page may include battery optimization controls and prompt information. For example, Figure 9A schematic diagram of the first page provided by an embodiment of the present application is shown, where the indication information includes a battery optimization control and a prompt message 101. The prompt message 101 can inform the user whether to turn on battery optimization to increase the battery's discharge cut-off voltage in order to improve the battery's service life. In addition, the battery optimization control 510 can be used as a trigger entry. If the user turns on the battery optimization control, the terminal device can start the operation of increasing the battery's discharge cut-off voltage so that the battery operates based on the increased discharge cut-off voltage. If the user does not turn on the battery optimization control ( Figure 9 (The state in which the battery optimization control is not turned on is not shown), the terminal device can continue to maintain the current discharge cut-off voltage of the battery unchanged, so that the battery continues to operate based on the current discharge cut-off voltage. With this setting, it is possible to ultimately decide whether to increase the discharge cut-off voltage of the battery based on the user's choice. Alternatively, the indication information may also include selection prompt information, for example, selecting yes (or Yes) or (or or) no (or No), the user may select yes (or Yes) to control the terminal device to execute the operation process of controlling the battery's discharge cut-off voltage to increase. Of course, the user may also select no (or No) to control the terminal device to continue to maintain the battery's discharge cut-off voltage unchanged.

[0122] In another embodiment of the present application, when the deep discharge cumulative value meets the second preset condition, the first page may not be displayed, that is, the current discharge cut-off voltage is not directly increased based on the user's selection, so that the battery operates based on the increased discharge cut-off voltage.

[0123] S134. Since the number of charge-discharge cycles meets the first preset condition, this indicates that the battery has been in use for a long time. The probability of problems such as battery life degradation and swelling occurring due to long-term use is high. Therefore, the battery's discharge cut-off voltage may be controlled to increase to improve battery life and reduce swelling. Furthermore, upon determining that the number of charge-discharge cycles is greater than or equal to a cycle threshold, and before controlling the battery's discharge cut-off voltage to increase, a first page may be displayed on the display panel of the terminal device, allowing the user to select whether to increase the battery's discharge cut-off voltage. Alternatively, the current discharge cut-off voltage may be directly increased without displaying the first page, so that the battery operates based on the increased discharge cut-off voltage.

[0124] It should be noted that for heavy users, when the number of charge and discharge cycles does not meet the first preset condition, but the voltage V0 has been increased to the discharge cut-off voltage V0+|ΔV3| when the second preset condition is met, the discharge cut-off voltage V0+|ΔV4| needs to be increased after the number of charge and discharge cycles meets the first preset condition. V0+|ΔV3| and V0+|ΔV4| can be compared to find the larger value, and the larger value is used as the increased discharge cut-off voltage. For example, if V0+|ΔV3|>V0+|ΔV4|, V0+|ΔV3| is used as the increased discharge cut-off voltage. Of course, the discharge cut-off voltage can also be increased by |ΔV3| for the first time and by |ΔV4| for the second time. The specific product implementation shall prevail and is not specifically limited here.

[0125] It is understandable that, taking a battery with a rated capacity of 1000mAh as an example, Figure 10 , Figure 10 The diagram below illustrates the changes in battery parameters before and after the discharge cut-off voltage of a battery is increased. When the terminal device leaves the factory, the battery is in a relatively good performance state. When the battery of the terminal device is charged to full capacity, the actual remaining capacity is 100%, and the remaining capacity displayed on the display panel is 100%. Based on this, the battery begins to discharge. When the battery is discharged to the discharge cut-off voltage (3.0V), the terminal device shuts down. At the moment the terminal device is shut down, its actual remaining capacity is 0%, and the remaining capacity displayed on the display panel is also 0%, and the discharge cut-off capacity is 0mAh. After the battery has been used for a period of time, the discharge cut-off voltage of the battery can be controlled to increase based on the above-mentioned judgment logic, for example, to 3.2V. When the battery is charged to full capacity, the actual remaining capacity and the displayed remaining capacity are both 100%. Based on this, the battery begins to discharge. When the battery is discharged to the discharge cut-off voltage (3.2V), the terminal device is shut down. At the moment of shutdown of the terminal device, although the remaining capacity displayed on the display panel is 0%, due to the increase in the discharge cut-off voltage, the actual remaining capacity is not 0%, but 2%, and the discharge cut-off capacity is 20mAh, so that the battery power (or capacity) is not completely discharged, but some is retained, thereby reducing the deep discharge behavior of the battery during subsequent use.

[0126] It is worth mentioning that in the embodiment of the present application, the depth of discharge cumulative value is refreshed by obtaining the remaining power of the battery at the start of charging, and then different users are identified based on the depth of discharge cumulative value and the number of charge and discharge cycles. Compared with identifying different users by obtaining the voltage at the start of charging of the battery, the recognition accuracy can be improved. Specifically, Figure 11AThe figure shows the difference in battery voltage under different discharge currents LS (e.g., LS1, LS2, and LS3). The discharge rate of LS1 is smaller than that of LS2, which is smaller than that of LS3. Therefore, when the battery is fully charged, if the battery discharges the same capacity, different discharge currents will correspond to different discharge voltages. Therefore, directly using battery voltage to identify different users will result in large errors. The specific reasons are as follows: the battery starts discharging at time ta, and the battery starts discharging at time tb (e.g., Figure 11A The discharge is terminated at the time tb1, tb2, tb3) included in the figure, and the moment when the user starts charging may occur at tb (such as Figure 11A The time between tb1, tb2, tb3) and tc (the time when the battery voltage is in a stable state). Figure 11A As shown, assuming the same curve (such as the curve corresponding to LS1), in tb (such as Figure 11A The voltage values collected at different moments between tb1) and tc are different; at different LS (such as the curves corresponding to LS1 and LS2), the voltage values collected at the same moment are also different. Therefore, directly using the battery voltage to identify different users will result in a large error.

[0127] Figure 11B The figure shows the difference between the remaining battery capacity under different discharge currents LS (such as LS1, LS2, and LS3). It can be seen from the figure that the remaining capacity collected between tb and tc is the same, so using the remaining battery capacity to identify different users can be more accurate. The specific reasons are as follows: the battery starts discharging at time ta, and the battery is based on different discharge currents at tb (such as Figure 11B The discharge is terminated at the time tb1, tb2, tb3) included in the figure, and the moment when the user starts charging may occur at tb (such as Figure 11B The time between tb1, tb2, tb3) and tc (the time when the battery voltage is in a stable state). Figure 11B As shown, assuming the same curve (such as the curve corresponding to LS1), in tb (such as Figure 11B The remaining power collected at different times between tb1) and tc is the same. Figure 11B At the same time between tb1 and tb2 and tc, the remaining power collected is also the same. Therefore, the error of using the remaining battery power to identify different users is small.

[0128] To estimate the remaining battery capacity, you can directly use the fuel gauge attached to the battery device. The fuel gauge can use methods such as coulomb counting to record the current value of the battery during charging or discharging. It then uses a real-time clock (RTC) to integrate this current value over time. The discharged capacity is calculated by multiplying the current by time. The discharged capacity is then divided by the rated capacity of the battery to obtain the remaining capacity. Therefore, the remaining capacity takes both current and time into account, and is not simply estimated based on battery voltage.

[0129] In summary, for different users, especially heavy users, directly identifying the user's battery usage habits by recording the battery voltage will produce large errors. Using the remaining power is more accurate than directly using the battery voltage to identify heavy users.

[0130] Application scenario two: The relevant computer programs or pre-stored mapping relationships and other information used to implement the discharge control method provided in the embodiment of the present application can be stored in a server (such as a cloud server). In this application scenario, the terminal device and the server can communicate through the network, so that the server can execute the process of the discharge control method of a battery provided in the embodiment of the present application. In addition, in this application scenario, one or more terminal devices and the server can communicate through the network. It can be understood that the communication between the terminal device and the server can be implemented as communication with the server through the processor 130. Figure 12 An interaction diagram between a terminal device and a server provided by an embodiment of the present invention is shown.

[0131] S1. The battery sensor system in the terminal device can collect first information and second information of the battery. The first information includes at least one of the remaining power, voltage, temperature, current and other information corresponding to the start of charging during the battery charge and discharge cycle. The second information includes at least one of the battery capacity attenuation, battery fault information and other information during the battery charge and discharge cycle.

[0132] S2. The terminal device sends the collected first information and second information of the battery to the server.

[0133] S3. For the terminal device, the server inputs the first information and the second information of the battery of the terminal device into the battery depth discharge estimation model, matches the corresponding battery pack, and then inputs the first information and the second information into the characteristic risk function corresponding to the matched battery pack to generate the risk probability corresponding to the battery in the terminal device.

[0134] S4. Compare the risk probability corresponding to the terminal device with the risk threshold. If the risk probability is greater than or equal to the risk threshold, issue a battery protection instruction to the terminal device. If the risk probability is less than the risk threshold, no battery protection instruction is required.

[0135] S5. In response to the battery protection instruction, the terminal device may directly increase the current discharge cut-off voltage so that the battery operates based on the increased discharge cut-off voltage. Alternatively, in response to the battery protection instruction, the terminal device may control the display panel to display a first page for the user to select and ultimately decide whether to increase the battery's discharge cut-off voltage. It is understood that the process by which the user decides whether to increase the discharge cut-off voltage based on the first page can be referred to the description of the above embodiment and is not further elaborated here.

[0136] With this setting, a large number of computing processes are set on the server side, which can reduce the amount of data calculation on the terminal device side and reduce the power consumption of the terminal device.

[0137] A battery depth of discharge estimation model is established in a server. The training process of the battery depth of discharge estimation model may include the following steps: inputting a battery historical information feature sample set into the battery depth of discharge estimation model. The battery historical information feature sample set includes historical information features and status features of multiple batteries. The historical information features may include information such as the minimum discharge capacity, minimum discharge voltage, discharge temperature, and discharge rate corresponding to the initial charge of the battery during the charge and discharge cycle. The status features may include information such as battery capacity decay and battery fault information during the charge and discharge cycle. The multiple batteries are then grouped using the input battery historical information feature sample set, and the similarity between the historical information features of batteries in the same group is less than a threshold. A characteristic risk function is then generated for each group based on the currently available status feature results (e.g., battery capacity decay and battery fault information). Based on the characteristic risk function, a risk probability is generated. A higher battery capacity decay ratio or a higher number of faults in each group increases the risk probability of the corresponding battery group. When the battery history information feature sample set reaches a credible threshold number, a trained battery depth discharge estimation model can be obtained, and the trained battery depth discharge estimation model can be used as a big data model for battery depth discharge.

[0138] The present application also provides a computer-readable storage medium having computer program instructions stored thereon, which implement the steps of the charge and discharge control method provided by the present disclosure when the program instructions are executed by a processor.

[0139] In addition to being an independent electronic device, the above-mentioned device can also be part of an independent electronic device. For example, in one embodiment, the device can be an integrated circuit (IC) or a chip, wherein the integrated circuit can be a single IC or a collection of multiple ICs; the chip can include but is not limited to the following types: GPU (Graphics Processing Unit), CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), system on chip or system on chip, etc. The above-mentioned integrated circuit or chip can be used to execute executable instructions (or codes) to implement the above-mentioned charge and discharge control method. The executable instructions can be stored in the integrated circuit or chip, or can be obtained from other devices or equipment, for example, the integrated circuit or chip includes a processor, a memory, and an interface for communicating with other devices. The executable instructions may be stored in the processor, and when executed by the processor, the aforementioned charge and discharge control method may be implemented; alternatively, the integrated circuit or chip may receive the executable instructions via the interface and transmit them to the processor for execution, thereby implementing the aforementioned charge and discharge control method. In some possible embodiments, the integrated circuit or chip may be provided in a battery management system, a charge and discharge management module, or a server.

[0140] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned charge and discharge control method when executed by the programmable device.

[0141] The above content is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, and they should all be covered by the protection scope of the present application.

Claims

1. A battery discharge control method, characterized in that: include: Obtaining the remaining power of the battery corresponding to the initial charge in the charge and discharge cycle; Refresh the deep discharge cumulative value according to the remaining power; Controlling the discharge cut-off voltage of the battery to increase according to the accumulated value of deep discharge and the number of charge and discharge cycles; The step of controlling the discharge cut-off voltage of the battery to increase according to the accumulated depth of discharge value and the number of charge and discharge cycles includes: In response to the number of charge and discharge cycles not satisfying a first preset condition and the accumulated depth of discharge value satisfying a second preset condition, controlling the discharge cut-off voltage of the battery to increase; The deep discharge cumulative value satisfies a second preset condition, including: The deep discharge cumulative value is greater than or equal to a deep discharge adjustment threshold.

2. The discharge control method according to claim 1, wherein: The refreshing of the deep discharge cumulative value according to the remaining power is specifically refreshing the deep discharge cumulative value in an accumulation manner according to the remaining power.

3. The discharge control method according to claim 1, wherein: The updating of the deep discharge cumulative value according to the remaining power is specifically updating the deep discharge cumulative value in a weighted manner according to the remaining power.

4. The discharge control method according to claim 3, wherein: The method further includes: obtaining a temperature corresponding to the start of charging of the battery during the charge-discharge cycle; The updating of the deep discharge cumulative value by using a weighted method according to the remaining power specifically includes: The depth of discharge cumulative value is updated in a weighted manner according to the remaining power and the temperature.

5. The discharge control method according to any one of claims 1 to 4, characterized in that: The deep discharge adjustment threshold includes a first deep discharge adjustment threshold and a second deep discharge adjustment threshold, wherein the second deep discharge adjustment threshold is greater than the first deep discharge adjustment threshold. The controlling the discharge cut-off voltage of the battery to increase includes: The deep discharge cumulative value is greater than or equal to the first deep discharge adjustment threshold, and the discharge cut-off voltage is increased to the first discharge cut-off voltage; The deep discharge cumulative value is greater than or equal to the second deep discharge adjustment threshold, and the discharge cut-off voltage is increased to the second discharge cut-off voltage.

6. The discharge control method according to claim 5, wherein: A difference between the discharge cut-off voltage and the first discharge cut-off voltage is a first difference, a difference between the first discharge cut-off voltage and the second discharge cut-off voltage is a second difference, and an absolute value of the second difference is smaller than an absolute value of the first difference.

7. The discharge control method according to any one of claims 1 to 4, characterized in that: The method of controlling the discharge cut-off voltage of the battery to increase according to the accumulated depth of discharge value and the number of charge and discharge cycles further includes: In response to the number of charge and discharge cycles meeting the first preset condition, the discharge cut-off voltage of the battery is controlled to increase.

8. The discharge control method according to any one of claims 1 to 4, characterized in that: The discharge control method is applied to a terminal device, the battery is provided in the terminal device, and the terminal device further includes a display panel; The method further comprises, before controlling the discharge cut-off voltage of the battery to increase: Displaying a first page on the display panel, the first page including instruction information, the instruction information being used to indicate whether to increase the discharge cut-off voltage of the battery; Upon receiving a determination operation input by a user, the step of controlling the discharge cut-off voltage of the battery to increase is performed.

9. A chip, characterized in that: The chip is used to execute the method according to any one of claims 1 to 8.

10. A terminal device, characterized in that: Comprising the chip as claimed in claim 9.

11. A system, characterized in that: include: A terminal device and a server; the terminal device is the terminal device according to claim 10; The terminal device is configured to send first information and second information of a battery in the terminal device to the server; wherein the first information includes at least one of the remaining power, voltage, temperature, and current corresponding to the start of charging of the battery during a charge-discharge cycle, and the second information includes at least one of capacity attenuation and fault information of the battery during the charge-discharge cycle; The server is used to input the first information and the second information of the battery into a battery deep discharge estimation model, and the battery deep discharge estimation model outputs a risk probability corresponding to the battery; if the risk probability is greater than or equal to a risk threshold, instruct the terminal device to control the discharge cut-off voltage of the battery to increase.

12. The system according to claim 11, wherein The terminal device is also used to: receive the battery maintenance instruction, display a first page on the display panel, and, upon receiving a confirmation operation input by the user, execute the control of increasing the discharge cut-off voltage of the battery; wherein the first page includes indication information, and the indication information is used to indicate whether to increase the discharge cut-off voltage of the battery.

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