End-of-discharge voltage control method and system, and electronic device

Abstract

An end-of-discharge voltage control method and system, and an electronic device. The method comprises: determining that a cell temperature of a battery is within a first temperature interval, and the remaining capacity of the battery is less than or equal to a capacity threshold; in response to a discharge rate of the battery being less than or equal to a first discharge threshold, adjusting an end-of-discharge voltage of the battery to a first voltage value; and in response to the discharge rate being greater than a second discharge threshold, adjusting the end-of-discharge voltage to a second voltage value, wherein the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature interval is represented as a range of a rated operating temperature of the battery. By using the method, when it is determined that the remaining capacity of a battery reaches a certain range, an end-of-discharge voltage of the battery is adjusted on the basis of a cell temperature and discharge rate of the battery, and thus the battery can deliver more capacity at a high discharge rate, thereby prolonging the service time of the battery and improving the endurance capability thereof.

Description

Cut-off voltage control methods, systems and electronic equipment

[0001] This application claims priority to Chinese Patent Application No. 202411192897.2, filed on August 28, 2024, entitled “Stop Voltage Control Method, System and Electronic Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The embodiments of this application relate to the field of battery technology, and in particular to a cutoff voltage control method, system and electronic device. Background Technology

[0003] Electronic devices encounter various discharge modes during daily use, such as standby mode and high-load mode. In standby mode, the battery discharges at a low rate, releasing a large amount of charge with a low rebound voltage. In high-load mode, the battery discharges at a high rate, releasing less charge with a high rebound voltage. Because the battery's cutoff voltage cannot be adjusted according to different discharge modes, a significant portion of the battery's usable capacity remains unreleased when discharging at a high rate, thus reducing battery capacity utilization and shortening battery life. Summary of the Invention

[0004] The purpose of this application is to provide a cutoff voltage control method to solve the technical problem in related technologies where the cutoff voltage of a battery cannot be adjusted according to different discharge modes, thus reducing the battery's capacity utilization. Another embodiment of this application aims to provide a cutoff voltage control system to solve the technical problem in related technologies where the cutoff voltage of a battery cannot be adjusted according to different discharge modes, thus reducing the battery's capacity utilization.

[0005] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0006] Firstly, a cutoff voltage control method is provided, including:

[0007] The battery cell temperature is determined to be within a first temperature range, and the remaining capacity of the battery is less than or equal to a capacity threshold.

[0008] In response to the battery's discharge rate being less than or equal to a first discharge threshold, the battery's cutoff voltage is adjusted to a first voltage value;

[0009] In response to the discharge rate being greater than the second discharge threshold, the cutoff voltage is adjusted to the second voltage value;

[0010] Wherein, the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature.

[0011] In conjunction with the first aspect, the method further includes:

[0012] In response to the discharge rate being greater than a first discharge threshold and less than or equal to a second discharge threshold, the cutoff voltage is adjusted to a third voltage value;

[0013] The third voltage value is greater than the second voltage value and less than the first voltage value.

[0014] In conjunction with the first aspect, the method further includes:

[0015] In response to the discharge rate being greater than a first discharge threshold and less than or equal to a third discharge threshold, the cutoff voltage is adjusted to the third voltage value;

[0016] Wherein, the third discharge threshold is greater than the first discharge threshold and less than the second discharge threshold, and the third voltage value is greater than the second voltage value and less than the first voltage value.

[0017] In conjunction with the first aspect, the method further includes:

[0018] In response to the discharge rate being greater than a third discharge threshold and less than or equal to the second discharge threshold, the cutoff voltage is adjusted to a fourth voltage value;

[0019] Wherein, the third discharge threshold is greater than the first discharge threshold and less than the second discharge threshold, and the fourth voltage value is greater than the second voltage value and less than the third voltage value.

[0020] In conjunction with the first aspect, the method further includes:

[0021] If the cell temperature is determined to be within the second temperature range and the remaining capacity of the battery is less than or equal to the capacity threshold, the cutoff voltage is adjusted to the third voltage value.

[0022] Wherein, the third voltage value is greater than the second voltage value and less than the first voltage value, and the second temperature range is characterized as the range of the battery's non-rated operating temperature.

[0023] In conjunction with the first aspect, the first temperature range includes 15 to 60°C, and the second temperature range includes 0 to 15°C.

[0024] In conjunction with the first aspect, the cutoff voltage includes at least one of the discharge termination voltage, over-discharge protection voltage, and shutdown voltage.

[0025] In conjunction with the first aspect, the capacity threshold ranges from 5% to 15%.

[0026] Secondly, a cutoff voltage control system is provided, the system comprising:

[0027] A first monitoring module is configured to determine that the remaining capacity of the battery is less than or equal to a capacity threshold.

[0028] A second monitoring module is configured to determine that the cell temperature of the battery is within a first temperature range;

[0029] A first adjustment module is configured to adjust the cutoff voltage of the battery to a first voltage value in response to the battery's discharge rate being less than or equal to a first discharge threshold.

[0030] A second adjustment module is configured to adjust the cutoff voltage to a second voltage value in response to the discharge rate being greater than a second discharge threshold.

[0031] Wherein, the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature.

[0032] Thirdly, an electronic device is provided, including a memory and a processor; the memory is used to store a computer program; the processor is used to implement the cutoff voltage control method as described in any one of the first aspects when the computer program is executed.

[0033] One of the above technical solutions has the following advantages or beneficial effects:

[0034] This application provides a cutoff voltage control method, comprising: determining that the remaining capacity of the battery is less than or equal to a capacity threshold, and the cell temperature of the battery is within a first temperature range; adjusting the cutoff voltage of the battery to a first voltage value in response to the discharge rate of the battery being less than or equal to a first discharge threshold; and adjusting the cutoff voltage to a second voltage value in response to the discharge rate being greater than a second discharge threshold; wherein the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature. The cutoff voltage control method provided in this application, when determining that the remaining capacity of the battery reaches a certain range, adjusts the cutoff voltage of the battery according to the cell temperature and discharge rate, thereby enabling the battery to release more electricity at high discharge rates, thus extending the battery's usage time and improving its range.

[0035] This application also provides a cutoff voltage control system, comprising: a first monitoring module configured to determine that the remaining capacity of the battery is less than or equal to a capacity threshold; a second monitoring module configured to determine that the cell temperature of the battery is within a first temperature range; a first adjustment module configured to adjust the cutoff voltage of the battery to a first voltage value in response to the battery's discharge rate being less than or equal to a first discharge threshold; and a second adjustment module configured to adjust the cutoff voltage to a second voltage value in response to the discharge rate being greater than a second discharge threshold; wherein the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature. The cutoff voltage control system provided in this application determines that the remaining capacity of the battery reaches a certain range through the first monitoring module, then determines that the cell temperature of the battery is within the first temperature range based on the second monitoring module, and finally adjusts the cutoff voltage of the battery according to the discharge rate through the first or second adjustment module, thereby enabling the battery to release more electricity at high discharge rates, thus extending the battery's usage time and improving its range. Attached Figure Description

[0036] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0037] Figure 1 is a schematic diagram of the cutoff voltage control method steps provided in an embodiment of this application;

[0038] Figure 2 is a schematic diagram of the cutoff voltage control system provided in an embodiment of this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In some embodiments of this application, during battery discharge, due to different user habits, batteries exhibit different discharge rates and temperatures. The devices do not adjust the cutoff voltage according to battery usage, resulting in significant differences in battery capacity released by different users. Typically, at high discharge rates, the released capacity is low, but the rebound voltage is high, leading to low battery capacity utilization. A large amount of usable capacity remains unreleased within the battery, thus shortening the battery life. This is illustrated in Table 1 below.

[0041] Table 1

[0042] Table 1 shows that when the discharge rate is less than 0.2C, the battery capacity utilization rate reaches 100%, meaning the battery capacity can be fully utilized. When the discharge rate is greater than 0.2C and less than or equal to 0.5C, the battery capacity utilization rate is no less than 97%, meaning 3% of the battery capacity is unused. When the discharge rate is greater than 0.5C and less than or equal to 1.0C, the battery capacity utilization rate is no less than 95%, meaning 5% of the battery capacity is unused. When the discharge rate is greater than 1.0C, the battery capacity utilization rate is no less than 93%, meaning 7% of the battery capacity is unused. Therefore, when the cutoff voltage remains constant, the higher the discharge rate, the lower the battery capacity utilization rate, and the significantly shorter the battery range.

[0043] The cutoff voltage (End of Discharge Voltage, abbreviated as EDV) provided in this application embodiment is also known as the discharge end voltage. During the discharge process, as the remaining capacity decreases, the battery voltage gradually decreases. When the battery discharges to a level less than or equal to the cutoff voltage, the battery stops discharging, and at this time, the remaining capacity of the battery is set to 0%.

[0044] In some embodiments of this application, the cutoff voltage may also include an over-discharge protection voltage and a shutdown voltage. The over-discharge protection voltage refers to the minimum permissible voltage value reached by the battery during discharge. When the battery voltage drops to or below the set over-discharge protection voltage, the battery protection circuit automatically disconnects the battery from the load to protect the battery from damage caused by over-discharge. Setting the over-discharge protection voltage can help extend battery life and avoid the negative impact of over-discharge on the battery. The shutdown voltage refers to the voltage threshold at which the electrical device automatically shuts down or enters standby mode when the battery voltage drops to a certain level. When the battery voltage drops to or below the set shutdown voltage, the electrical device automatically stops operating to avoid abnormal operation or data loss due to low battery power. Setting the shutdown voltage is to protect the device and data and remind the user to charge or replace the battery.

[0045] This application proposes that when the remaining capacity of the battery approaches a certain level, changes in current and temperature are detected to adjust the cutoff voltage point, thereby increasing the usable capacity of the battery, extending the battery life of the device, solving the problem of extra usage time for users in emergency situations, improving the utilization rate of reserved capacity, and meeting the discharge capacity requirements of users in emergency mode.

[0046] The batteries mentioned in this application can be categorized by shape, including battery packs, cylindrical batteries, prismatic batteries, and blade batteries. They can also be categorized by their internal components, including lithium-ion batteries, lithium polymer batteries, lead-acid batteries, lithium manganese oxide batteries, lithium manganese oxide polymer batteries, and fuel cells.

[0047] The specific implementation methods of this application are illustrated below through examples:

[0048] As shown in Figure 1, this application provides a cutoff voltage control method, including:

[0049] S1: Determine that the remaining capacity of the battery is less than or equal to the capacity threshold.

[0050] Specifically, a battery's remaining capacity refers to the electrical energy that the battery can currently use, usually measured in the form of charge or electrical energy. The unit for remaining battery capacity is typically ampere-hour (Ah) or milliampere-hour (mAh), which indicates the duration for which the battery can provide current under specific conditions. For example, a 1Ah battery can provide 1 amp of current for 1 hour, while a 2000mAh battery can provide 2 amps of current for 1 hour.

[0051] Specifically, the remaining battery capacity can be monitored and displayed through a battery management system or a battery power indicator. These systems use sensors and algorithms inside the battery to estimate the remaining capacity and display it as a percentage or other format.

[0052] In this embodiment, the capacity threshold is used to determine whether the battery's remaining capacity is about to be depleted, thereby facilitating the adjustment of the battery's cutoff voltage. When the battery's remaining capacity is greater than the capacity threshold, there is still a significant amount of charge inside the battery, indicating sufficient power and no need for the user to worry about battery life. When the battery is about to be depleted, adjusting the cutoff voltage can extend the battery life.

[0053] In this embodiment, the capacity threshold ranges from 5% to 15%, and achievable capacity thresholds include, but are not limited to, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, and 14%. When the remaining battery capacity is within this range, the battery retains a certain amount of charge, and adjusting the cutoff voltage at this time can provide sufficient power for the user for a longer period of time. Of course, this range does not mean that other values ​​are undesirable. Since most electrical devices experience voltage instability when the remaining battery capacity is below 5%, they may experience momentary shutdowns; while when it is above 15%, the remaining battery capacity is substantial, giving the user ample time to handle emergencies.

[0054] S2: Determine that the battery cell temperature is within the first temperature range.

[0055] Specifically, the cell temperature of a battery is a crucial indicator affecting battery discharge. Increased cell temperature increases internal resistance, hindering current flow and reducing discharge capacity. Increased internal resistance also leads to increased self-discharge, causing faster discharge. Furthermore, higher cell temperature reduces the battery's effective capacity, meaning less energy can be stored. This is because batteries experience greater self-discharge at higher temperatures, resulting in energy loss even when not in use. Simultaneously, higher cell temperature accelerates internal chemical reactions, increasing the discharge rate. This means that under the same load, a battery will deplete its energy more quickly at higher temperatures. The increased cell temperature leads to a higher self-discharge rate, resulting in energy loss even when not in use. This ultimately reduces battery discharge efficiency and shortens charging time.

[0056] In this embodiment of the application, when it is determined that the remaining capacity of the battery is close to being exhausted, it is then determined whether the current cell temperature of the battery is within a first temperature range. The temperature range of the first temperature range includes 15 to 60°C. This temperature range is the range of the battery's rated operating temperature. That is, within this temperature range, the battery's discharge efficiency is relatively high and it is less affected by temperature.

[0057] In some embodiments of this application, after determining that the current cell temperature of the battery is within a first temperature range, it is then determined whether the remaining capacity of the battery is less than or equal to a capacity threshold. The temperature range of the first temperature range includes 15 to 60°C, and the value range of the capacity threshold includes 5% to 15%. The achievable capacity thresholds include, but are not limited to, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, and 14%.

[0058] S31: In response to the battery's discharge rate being less than or equal to a first discharge threshold, adjust the battery's cutoff voltage to a first voltage value.

[0059] Specifically, the discharge rate of a battery refers to its ability to continuously provide current, usually expressed as a multiple. The discharge rate represents the proportional relationship between current and battery capacity. For example, a battery with a capacity of 1000mAh, if its discharge rate is 2C, can discharge at a current of 2000mA (or 2A). Similarly, if the discharge rate is 0.5C, it can only discharge at a current of 500mA (or 0.5A). The unit of discharge rate is usually C, which is a multiple of battery capacity.

[0060] In this embodiment, the first discharge threshold is used to determine the level of the battery discharge rate, and the battery cutoff voltage is adjusted according to the level of the battery discharge rate.

[0061] In this embodiment, the first discharge threshold has a discharge rate of 0.2C and a first voltage value of 3.25V / cell, where cell represents a single battery cell. This means that the voltage of each individual battery cell needs to be monitored. When the discharge rate during discharge is less than 0.2C, the battery's discharge rate is relatively low. At this time, the device is typically in standby mode, indicating that the user's use of the device is not urgent. Therefore, the battery's cutoff voltage can be left unadjusted or reduced by a small value, thereby ensuring that the battery retains a higher starting voltage and saving charging time.

[0062] S32: In response to the discharge rate being greater than the second discharge threshold, adjust the cutoff voltage to the second voltage value.

[0063] Specifically, the second discharge threshold has a discharge rate of 1.0C and a second voltage value of 2.6V / cell. When the battery discharge rate exceeds 1.0C, the discharge rate is relatively high. This indicates that the device is typically operating at high power, suggesting the user is using demanding software or multiple applications simultaneously. To meet user needs, the battery's cutoff voltage can be adjusted to its lowest value, allowing the battery to release more charge and extending its battery life.

[0064] S33: In response to a discharge rate greater than a first discharge threshold and less than or equal to a second discharge threshold, adjust the cutoff voltage to a third voltage value; wherein the third voltage value is greater than the second voltage value and less than the first voltage value.

[0065] Specifically, the first discharge threshold has a discharge rate of 0.2C, the second discharge threshold has a discharge rate of 1.0C, and the third voltage value is 3.0–2.7V / cell. It can be understood that when the battery's discharge rate is greater than 0.2C and less than or equal to 1.0C, the battery's discharge rate is within the range for daily office work, indicating that it is being used for tasks such as online work meetings, work emails, document processing, and work reports. Therefore, the battery's cutoff voltage can be lowered to 3.0–2.7V / cell, allowing the battery to release more charge than in standby mode, extending battery life and ensuring users have sufficient time to handle work tasks.

[0066] S34: In response to a discharge rate greater than a first discharge threshold and less than or equal to a third discharge threshold, adjust the cutoff voltage to a third voltage value; wherein the third discharge threshold is greater than the first discharge threshold and less than the second discharge threshold, and the third voltage value is greater than the second voltage value and less than the first voltage value.

[0067] Specifically, the first discharge threshold has a discharge rate of 0.2C, the third discharge threshold has a discharge rate of 0.5C, and the third voltage value is 3.0V / cell. When the battery's discharge rate is greater than 0.2C and less than or equal to 0.5C, the battery's discharge rate is within the range of daily office work, and the amount of office software used is relatively small. To ensure that users have more time to handle work matters, the battery's cutoff voltage can be reduced to 3.0V / cell. This allows the battery to release more power than in standby mode, which not only extends the battery's battery life, giving users enough time to work, but also ensures that the battery has a higher starting voltage, saving battery charging time.

[0068] S35: In response to a discharge rate greater than the third discharge threshold and less than or equal to the second discharge threshold, adjust the cutoff voltage to the fourth voltage value; wherein the third discharge threshold is greater than the first discharge threshold and less than the second discharge threshold, and the fourth voltage value is greater than the second voltage value and less than the third voltage value.

[0069] Specifically, the third discharge threshold has a discharge rate of 0.5C, the second discharge threshold has a discharge rate of 1.0C, and the third voltage value is 2.8V / cell. When the battery's discharge rate is greater than 0.5C and less than or equal to 1.0C, the battery's discharge rate falls within the range of daily office work, and a significant amount of office software is used. To ensure users have sufficient time to handle work matters, the battery's cutoff voltage can be lowered to 2.8V / cell. This allows the battery to release more charge than when the cutoff voltage is 3.0V / cell, thus extending battery life and giving users more time to complete their work.

[0070] S4: Determine that the cell temperature is within the second temperature range and the remaining capacity of the battery is less than or equal to the capacity threshold, and adjust the cutoff voltage to the third voltage value; wherein, the third voltage value is greater than the second voltage value and less than the first voltage value, and the second temperature range is characterized as the range of the battery's non-rated operating temperature.

[0071] Specifically, the non-rated operating temperature of a battery refers to the temperature range within which the battery's internal resistance increases and its discharge efficiency decreases. This second temperature range typically includes 0–15°C. When the cell temperature is determined to be within the 0–15°C range, regardless of the battery's discharge rate, the battery's cutoff voltage is adjusted to 3.0V / cell. However, because the battery's discharge efficiency is already low, excessively lowering the cutoff voltage at this point can cause irreversible damage, reducing battery life and impacting its overall lifespan. Therefore, adjusting the cutoff voltage to 3.0V / cell not only extends battery life, giving users sufficient time to work, but also ensures a higher initial voltage, saving charging time and preventing internal battery damage.

[0072] It should be noted that the battery's operating temperature range is 0–60°C. When the cell temperature drops below zero, the battery capacity decreases significantly, drastically shortening the battery's runtime. Simultaneously, the increased internal resistance reduces the battery's discharge capacity, causing an excessive drop in operating voltage and affecting the normal operation of the device. Conversely, when the cell temperature exceeds 60°C, it increases the rate of internal chemical reactions, leading to reduced capacity, increased resistance, and accelerated self-discharge. The battery will be unable to provide normal current output and energy storage, severely impacting its performance. Furthermore, when the cell temperature exceeds 60°C, the battery's operating voltage becomes unstable and fluctuates significantly. Using the battery at this temperature increases internal pressure and gas generation, potentially causing expansion, leakage, rupture, or even fire and explosion. It is worth noting that in some embodiments of this application, the suitable operating temperature range for the battery can be below 0°C or above 60°C, depending on the materials used or the design of the battery's unique structure. This application does not impose further limitations on this aspect.

[0073] It is understood that the cutoff voltage control method provided in this application, when determining that the remaining capacity of the battery reaches a certain range, can comprehensively consider the battery cell temperature and the discharge rate to adjust the battery's cutoff voltage, thereby enabling the battery to release more power at a high discharge rate, thus extending the battery's usage time, improving the battery's endurance, and providing users with more time for processing tasks.

[0074] As shown in Figure 2, this application embodiment also provides a cutoff voltage control system, the system including: a first monitoring module, a second monitoring module, a first adjustment module, and a second adjustment module; the first monitoring module is configured to determine that the remaining capacity of the battery is less than or equal to a capacity threshold; the second monitoring module is configured to determine that the cell temperature of the battery is within a first temperature range; the first adjustment module is configured to adjust the cutoff voltage of the battery to a first voltage value in response to the discharge rate of the battery being less than or equal to a first discharge threshold; the second adjustment module is configured to adjust the cutoff voltage to a second voltage value in response to the discharge rate being greater than a second discharge threshold; wherein, the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature.

[0075] Specifically, the cutoff voltage control system of this application continuously monitors the remaining battery capacity through a first monitoring module to determine whether the remaining capacity is less than or equal to a capacity threshold, the capacity threshold ranging from 5% to 15%; and continuously monitors the battery cell temperature through a second monitoring module to determine whether the cell temperature is within a first temperature range, the first temperature range ranging from 15 to 60°C. When all the above conditions are met, if the battery discharge rate is less than or equal to the first discharge threshold, the battery cutoff voltage is adjusted to a first voltage value, the first discharge threshold having a discharge rate of 0.2C and a first voltage value of 3.25V / cell; and if the battery discharge rate is greater than a second discharge threshold, the battery cutoff voltage is adjusted to a second voltage value, the second discharge threshold having a discharge rate of 1.0C and a second voltage value of 2.6V / cell. By adjusting the battery cutoff voltage, the battery can release more power than in standby mode, extending the battery's runtime and ensuring that the user has sufficient time to handle work matters.

[0076] In this embodiment, the cutoff voltage control system further includes a third adjustment module, a fourth adjustment module, and a fifth adjustment module. The third adjustment module is configured to adjust the cutoff voltage to a third voltage value in response to a discharge rate greater than a first discharge threshold and less than or equal to a second discharge threshold. The third voltage value is greater than the second voltage value and less than the first voltage value, and the magnitude of the third voltage value is 3.0–2.7 V / cell. The fourth adjustment module is configured to adjust the cutoff voltage to a third voltage value in response to a discharge rate greater than the first discharge threshold and less than or equal to the third discharge threshold. The third discharge threshold is greater than the first discharge threshold, less than the second discharge threshold, and the third voltage value is greater than the second voltage value and less than the first voltage value. The discharge rate of the third discharge threshold is 0.5C. The fifth adjustment module is configured to adjust the cutoff voltage to a fourth voltage value in response to a discharge rate greater than the third discharge threshold and less than or equal to the second discharge threshold. The third discharge threshold is greater than the first discharge threshold, less than the second discharge threshold, and the fourth voltage value is greater than the second voltage value and less than the first voltage value.

[0077] The third, fourth, and fifth adjustment modules provided by the cutoff voltage control system of this application can adjust the cutoff voltage of the battery to different values ​​according to the different discharge rates of the battery when the cell temperature is determined to be in the first temperature range. This allows the battery to release more power and extend the battery's battery life, ensuring that the user has enough time to handle work matters.

[0078] The cutoff voltage control system of this application also provides a sixth adjustment module, which is configured to determine that the cell temperature is within a second temperature range and adjust the cutoff voltage to a third voltage value. The third voltage value is greater than the second voltage value but less than the first voltage value. The second temperature range is characterized as the range of the battery's non-rated operating temperature. The range of the second temperature range includes 0–15°C. When the cell temperature is determined to be within the 0–15°C range, regardless of the battery's discharge rate, the battery's cutoff voltage is adjusted to 3.0V / cell. At this point, due to the battery's low discharge efficiency, excessively reducing the cutoff voltage will cause irreversible damage to the battery, thereby reducing the battery's range and affecting its lifespan.

[0079] It is understood that the cutoff voltage control system provided in this application embodiment can adjust different cutoff voltages according to the temperature range of the battery cell during battery discharge and the battery discharge rate, thereby enabling the battery to release more power, improve battery life, and provide users with more time to handle work.

[0080] This application also provides an electronic device, including a memory and a processor; the memory is used to store a computer program; the processor is used to implement the cutoff voltage control method provided in any of the above embodiments when the computer program is executed.

[0081] The electronic devices referred to in this application include laptops, mobile phones, tablets, etc. When these electronic devices use the cutoff voltage control method provided in the embodiments of this application, the electronic devices can adjust different cutoff voltages according to the temperature range of the battery cell during battery discharge and the battery discharge rate, thereby enabling the battery to release more power, increasing battery life, and providing users with more time to process work.

[0082] The cutoff voltage control method, system, and electronic device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cutoff voltage control method, characterized in that, include: The battery cell temperature is determined to be within a first temperature range, and the remaining capacity of the battery is less than or equal to a capacity threshold. In response to the battery's discharge rate being less than or equal to a first discharge threshold, the battery's cutoff voltage is adjusted to a first voltage value; In response to the discharge rate being greater than the second discharge threshold, the cutoff voltage is adjusted to the second voltage value; Wherein, the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature.

2. The cutoff voltage control method as described in claim 1, characterized in that, The method further includes: In response to the discharge rate being greater than a first discharge threshold and less than or equal to a second discharge threshold, the cutoff voltage is adjusted to a third voltage value; The third voltage value is greater than the second voltage value and less than the first voltage value.

3. The cutoff voltage control method as described in claim 1, characterized in that, The method further includes: In response to the discharge rate being greater than a first discharge threshold and less than or equal to a third discharge threshold, the cutoff voltage is adjusted to the third voltage value; Wherein, the third discharge threshold is greater than the first discharge threshold and less than the second discharge threshold, and the third voltage value is greater than the second voltage value and less than the first voltage value.

4. The cutoff voltage control method as described in claim 3, characterized in that, The method further includes: In response to the discharge rate being greater than a third discharge threshold and less than or equal to the second discharge threshold, the cutoff voltage is adjusted to a fourth voltage value; Wherein, the third discharge threshold is greater than the first discharge threshold and less than the second discharge threshold, and the fourth voltage value is greater than the second voltage value and less than the third voltage value.

5. The cutoff voltage control method as described in claim 1, characterized in that, The method further includes: If the cell temperature is determined to be within the second temperature range and the remaining capacity of the battery is less than or equal to the capacity threshold, the cutoff voltage is adjusted to the third voltage value. Wherein, the third voltage value is greater than the second voltage value and less than the first voltage value, and the second temperature range is characterized as the range of the battery's non-rated operating temperature.

6. The cutoff voltage control method as described in claim 5, characterized in that, The first temperature range includes 15 to 60°C, and the second temperature range includes 0 to 15°C.

7. The cutoff voltage control method as described in claim 1, characterized in that, The cutoff voltage includes at least one of the following: discharge end voltage, over-discharge protection voltage, and shutdown voltage.

8. The cutoff voltage control method as described in claim 1, characterized in that, The capacity threshold ranges from 5% to 15%.

9. A cutoff voltage control system, characterized in that, The system includes: A first monitoring module is configured to determine that the remaining capacity of the battery is less than or equal to a capacity threshold. A second monitoring module is configured to determine that the cell temperature of the battery is within a first temperature range; A first adjustment module is configured to adjust the cutoff voltage of the battery to a first voltage value in response to the battery's discharge rate being less than or equal to a first discharge threshold. A second adjustment module is configured to adjust the cutoff voltage to a second voltage value in response to the discharge rate being greater than a second discharge threshold. Wherein, the second discharge threshold is greater than the first discharge threshold, the first voltage value is greater than the second voltage value, and the first temperature range is characterized as the range of the battery's rated operating temperature.

10. An electronic device, characterized in that, It includes a memory and a processor; the memory is used to store a computer program; the processor is used to implement the cutoff voltage control method as described in any one of claims 1-8 when the computer program is executed.

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