Battery using method and related device

Abstract

A battery using method comprises the steps that historical using data of a battery are read, temperature values of the battery are determined, and the temperature values comprise a first temperature value of the battery in the discharging process and / or a second temperature value of the battery in the charging process; and comparing the temperature value of the battery with a temperature threshold value, and adjusting the charging limiting voltage or the discharging limiting voltage of the battery according to a comparison result.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method of using a battery and related apparatus. Background Technology

[0002] The operating temperature of a battery affects its performance and health. Under high temperature and high voltage conditions, the active materials in the battery decompose more rapidly, exacerbating the proliferation of the electrolyte interfacial film, leading to irreversible capacity decay and shortening the battery's cycle life. Conversely, when charging at low temperatures, the conductivity of the electrolyte inside the battery decreases, reducing the migration rate of lithium ions. Especially during high-current charging, lithium ions cannot be inserted into the graphite layer of the negative electrode in time and are more likely to deposit metallic lithium on the surface of the negative electrode; this is known as "lithium plating," where the battery is prone to this phenomenon when charged at low temperature and low voltage. Lithium plating not only consumes active lithium ions, causing capacity loss, but can also puncture the separator, causing internal short circuits and posing serious safety hazards.

[0003] In related technologies, a fixed or relatively wide state-of-charge window is typically used to control battery charging and discharging. However, this approach struggles to cope with dynamic changes in battery operating temperature, thus limiting battery reliability in complex usage scenarios. Summary of the Invention

[0004] This application provides a battery usage method and related apparatus to improve the problem of low battery reliability in complex usage scenarios, reduce capacity decay and interface deterioration caused by battery aging during long-term use, reduce safety risks after long-term battery cycling, and improve battery life.

[0005] In a first aspect, this application provides a method for using a battery, the method comprising: reading historical usage data of the battery, determining the temperature value of the battery, the temperature value including a first temperature value of the battery during discharge and / or a second temperature value of the battery during charging; comparing the temperature value of the battery with a temperature threshold, and adjusting the charging limit voltage or the discharging limit voltage of the battery according to the comparison result.

[0006] Based on the first temperature value of the battery during discharge and / or the second temperature value of the battery during charging, the application scenario of the battery is determined. The charging limit voltage or discharging limit voltage of the battery is then dynamically adjusted according to the application scenario, so that the battery can dynamically adapt to its usage scenario, delay the capacity decay and interface deterioration caused by battery aging, and improve the reliability of the battery.

[0007] In some embodiments, the first temperature value includes the maximum temperature value of the battery during the discharge process, which includes the battery from the start of discharge to the end of discharge; and / or, the second temperature value includes the minimum temperature value of the battery during the charging process, which includes the battery from the start of charging to the end of charging.

[0008] By monitoring the maximum temperature value of the battery during the discharge process, it can be determined whether the battery is discharging at a high temperature, and thus whether the battery is suitable for professional user scenarios, improving the accuracy of determining the application scenario of the battery; by monitoring the minimum temperature value of the battery during the charging process, it can be determined whether the battery is charging at a low temperature, and thus whether the battery is suitable for ordinary user scenarios, improving the accuracy of determining the application scenario of the battery.

[0009] In some embodiments, the method includes: reducing the charging limit voltage of the battery in response to a first temperature value being greater than a first temperature threshold.

[0010] When the battery's first temperature value is greater than the first temperature threshold, it is determined that the battery is in a professional user scenario. By reducing the battery's charging limit voltage, the problem of battery discharge under high temperature and high voltage can be improved, the damage to the positive electrode material structure caused by the battery under high temperature and high voltage conditions can be mitigated, the battery capacity decay can be reduced, and the battery cycle life can be improved.

[0011] In some embodiments, before reducing the battery's charging limit voltage, the method further includes: determining a first sum of a currently recorded charging limit voltage adjustment gain and a first step length; reducing the battery's charging limit voltage according to the first step length in response to the first sum being less than or equal to a first gain threshold; or determining a difference between the currently recorded charging limit voltage and the first step length; reducing the battery's charging limit voltage according to the first step length in response to the difference being greater than or equal to a first boundary threshold.

[0012] If the sum of the currently recorded charging limit voltage adjustment gain and the first step length is less than or equal to the first gain threshold, or if the difference between the currently recorded charging limit voltage and the first step length is greater than or equal to the first boundary threshold, reducing the battery's charging limit voltage can prevent the adjustment of the charging limit voltage from exceeding the design margin, ensuring the battery's operating efficiency and thus improving the user experience.

[0013] In some embodiments, after reducing the charging limit voltage of the battery, the method further includes: increasing the charging limit voltage of the battery and increasing the discharging limit voltage of the battery in response to the second temperature value being less than a second temperature threshold more than a first value within a first duration; wherein the second temperature threshold is less than the first temperature threshold.

[0014] If the number of times the second temperature value is lower than the second temperature threshold is greater than the first value within the first time period, one possibility is that the battery usage mode has changed from a professional user scenario to a general user scenario. In this case, the charging limit voltage and discharging limit voltage of the battery should be increased accordingly to allow the battery to dynamically adapt to the current general user scenario and improve the battery's reliability.

[0015] In some embodiments, the method includes: increasing the discharge limit voltage of the battery in response to a second temperature value being less than a second temperature threshold.

[0016] When the second temperature value of the battery is lower than the first temperature threshold, it is determined that the battery is in a normal user scenario. The discharge limit voltage of the battery is appropriately increased to avoid over-discharge of the battery. This allows some lithium ions to be retained in the negative electrode graphite, thereby improving the lithium deposition situation when the battery is charged at low temperature. This effectively mitigates the capacity decay and thermal runaway risk caused by lithium deposition, and improves the cycle life and safety reliability of the battery.

[0017] In some embodiments, before increasing the discharge limit voltage of the battery, the method further includes: determining that the sum of the currently recorded discharge limit voltage adjustment gain and the second step size is a second sum value; increasing the discharge limit voltage of the battery according to the second step size in response to the second sum value being less than or equal to a second gain threshold; or determining that the sum of the currently recorded discharge limit voltage and the second step size is a third sum value; increasing the discharge limit voltage of the battery according to the second step size in response to the third sum value being less than or equal to a second boundary threshold.

[0018] If the sum of the currently recorded discharge limit voltage adjustment gain and the second step size is less than or equal to the second gain threshold, or if the sum of the currently recorded discharge limit voltage and the second step size is less than or equal to the second boundary threshold, increasing the battery's discharge limit voltage can prevent the adjustment of the discharge limit voltage from exceeding the design margin, ensuring the battery's operating efficiency and thus improving the user experience.

[0019] In some embodiments, after increasing the discharge limiting voltage of the battery, the method further includes: in response to the fact that the number of times a first temperature value is greater than a first temperature threshold within a second time period is greater than a second value, reducing the charging limiting voltage and the discharge limiting voltage of the battery; wherein the first temperature threshold is greater than the second temperature threshold.

[0020] If the number of times the second temperature value is lower than the second temperature threshold is greater than the second value within the second time period, one possibility is that the battery's usage scenario has changed from a previous ordinary user scenario to a professional user scenario. In this case, reducing the battery's charging limit voltage and discharging limit voltage allows the battery to dynamically adapt to the current professional user scenario, thereby improving the battery's reliability.

[0021] In some embodiments, reading historical usage data of the battery to determine the battery temperature value includes: determining a first temperature value of the battery under effective cycle conditions, and / or determining a second temperature value of the battery under effective cycle conditions; wherein, effective cycle conditions characterize the cycle in which the battery's discharge capacity is greater than a capacity threshold during the discharge process after one charge-discharge cycle.

[0022] Determine the first and / or second temperature values ​​of the battery under effective cycle conditions. By setting effective cycle conditions, it is possible to filter out situations where the battery is shallowly charged and discharged, such as during equipment trials or equipment relocation. This ensures that the collected temperature and charge / discharge information comes from typical operating conditions in actual applications, avoiding misjudgments of user behavior and thus improving the accuracy of analysis of the battery's application scenario.

[0023] Secondly, embodiments of this application provide a battery management system, including a controller and a memory, wherein the controller is used to execute a computer program stored in the memory, so that the battery management system implements any of the above-mentioned battery usage methods.

[0024] Thirdly, embodiments of this application provide a battery device, including a battery and the aforementioned battery management system.

[0025] Fourthly, embodiments of this application provide an electrical device including the aforementioned battery device. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the original SOC curve of the battery when it leaves the factory.

[0027] Figure 2 This is a diagram showing the correspondence between the actual SOC and the original SOC of a battery in related technologies.

[0028] Figure 3 This is a schematic diagram of the battery device provided in this application.

[0029] Figure 4 This is a flowchart illustrating a battery usage method provided in this application.

[0030] Figure 5 This is a schematic diagram of the battery management system provided in this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted that in this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects, not to describe a specific order or sequence.

[0033] In this application, the terms "exemplarily" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Technical solutions described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other technical solutions. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a concrete manner.

[0034] Batteries are currently used in a wide range of applications, including various devices. For example, they can be used in electric vehicles (electric cars, electric motorcycles, electric bicycles, electric scooters, etc.), cleaning equipment (such as robotic vacuum cleaners, vacuum cleaners, etc.), and aircraft (agricultural drones, consumer drones, industrial drones, logistics drones, etc.). They can also be used in mobile energy storage devices, home energy storage devices, industrial and commercial energy storage, uninterruptible power supplies, and other electronic devices that require batteries, such as personal computers, tablets, smartphones, and digital cameras. There are no restrictions on their applications.

[0035] This application uses the application of batteries in agricultural drones as an example to illustrate its purpose. Currently, agricultural drone users are primarily professional users, but with the increasing popularity of agricultural drones, the number of ordinary users (also known as "individual users," to distinguish them from team users among professional users) is constantly increasing. The usage patterns of agricultural drones differ significantly between these two scenarios. For example, ordinary users typically carry fully charged batteries for operations. When using the batteries, the depth of discharge is relatively large. After completing seeding or spraying operations on several acres of land, the drone will let the batteries rest for a period before recharging. Professional users, on the other hand, are usually a team equipped with multiple battery packs for continuous, alternating operations. One battery pack is placed inside the drone for discharge operations, while the others are recharged. When the battery packs are inside the drone for flight operations, the depth of discharge is usually less than that of ordinary users. Agricultural drones operate for longer periods, resulting in shorter or no resting time for the batteries. Therefore, in ordinary user scenarios, batteries are mostly in non-continuous operation. Charging at low temperatures often has a greater impact on battery safety and cycle life. The electrochemical failure model is usually due to the aging of battery kinetic characteristics caused by charging at low temperatures (such as below 15°C), leading to insufficient lithium intercalation at the negative electrode during charging, lithium ion precipitation, and reduced safety. In professional user scenarios, batteries are mostly in continuous operation, and are more often in high-temperature discharge conditions. The electrochemical failure model is mostly due to side reactions and gas generation of the positive electrode material under high state of charge (SOC). Under high SOC, the lattice structure of the positive electrode material (such as nickel-cobalt-manganese (NCM) ternary material) is unstable, and metal ions such as nickel (Ni), cobalt (Co), and manganese (Mn) are easily dissolved and migrated to the negative electrode, damaging the integrity of the solid-electrolyte interphase (SEI) film and further accelerating capacity decay.

[0036] Please see Figure 1 , Figure 1 This is a schematic diagram of the battery's initial SOC curve at the time of manufacture. The initial SOC curve is determined by the battery's chemical system, design parameters, and manufacturing process parameters. The initial SOC curve represents the relationship between the battery's state of charge and its voltage, obtained by testing under specified charging conditions. Figure 1 As shown, the horizontal axis represents the battery's SOC (the ratio of the battery's remaining capacity to its rated capacity), and the vertical axis represents the battery's open-circuit voltage. The maximum open-circuit voltage is the battery's charging limit voltage, denoted as... If the battery voltage reaches the charging limit voltage and charging stops during the charging process, the battery's SOC at this point is calibrated as 100%. The minimum open-circuit voltage is the battery's discharge limit voltage, denoted as... If the battery voltage reaches the discharge limit voltage during the discharge process and the discharge is stopped, the SOC of the battery at this time is calibrated as 0%.

[0037] In related technologies, a fixed or relatively wide state of charge (SOC) window is typically used to control battery charging and discharging. Considering the material characteristics of lithium-ion batteries, to ensure design margins and safe operating boundaries, the battery is operated between the actual charging limit voltage and the actual discharging limit voltage, where the actual charging limit voltage is less than or equal to... The actual discharge limiting voltage is greater than or equal to Please see. Figure 2 , Figure 2 This is a diagram showing the correspondence between the actual SOC and the initial SOC of a battery in related technologies. There is a certain distance between the limiting voltage of the initial SOC and the actual SOC. The initial discharge limiting voltage is denoted as... The actual discharge limiting voltage is denoted as The difference between the discharge limiting voltages of the two is defined as The original charging limit voltage is denoted as The actual charging limit voltage is denoted as The difference between the charging limit voltages of the two is defined as .

[0038] However, in actual battery use, limiting the battery's voltage operating range to a fixed range makes it difficult to adapt to scenarios with dynamic changes in battery operating temperature. For example, charging and discharging limit voltages determined in high-temperature scenarios may lead to lithium plating during low-temperature charging, resulting in poor battery safety and reliability. Conversely, charging and discharging limit voltages determined in low-temperature scenarios may cause damage to the positive electrode material during high-temperature, high-voltage discharge, leading to battery capacity decay and limiting the battery's cycle life.

[0039] In view of the above problems, this application provides a battery usage method, which determines the application scenario of the battery based on a first temperature value of the battery during the discharge process and / or a second temperature value of the battery during the charging process, thereby dynamically adjusting the charging limit voltage or discharging limit voltage of the battery according to the application scenario, so that the battery dynamically adapts to its usage scenario and improves the reliability and cycle life of the battery.

[0040] The present application will now be described in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] Please see Figure 3 , Figure 3 This is a schematic diagram of the battery device provided in this application. Figure 3 As shown, the battery usage method is applied to battery device 10, which includes battery 11 and battery management system 12 (BMS), with BMS connected to battery 11. It is understood that... Figure 3 The battery device 10 can be considered as the battery pack described above. The battery device 10 is installed inside the drone and provides power to the drone.

[0042] The functional modules of the battery device 10 are described below. The battery 11, as the energy unit of the battery device 10, is used to store and release electrical energy. The battery management system 12 is used to collect and / or read historical usage data of the battery 11. This historical usage data may include: effective cycle conditions, effective cycle count, effective charging voltage, effective discharging voltage, upper voltage threshold, lower voltage threshold, charging limit voltage adjustment gain, discharging limit voltage adjustment gain, and the temperature value of the battery 11.

[0043] The battery management system 12 collects and / or reads historical usage data of the battery 11, determines the temperature value of the battery 11, compares the temperature value of the battery 11 with a temperature threshold, obtains a comparison result, and adjusts the charging limit voltage or discharging limit voltage of the battery 11 according to the comparison result, so that the battery 11 performs charging and discharging operations according to the adjusted charging limit voltage or discharging limit voltage. The temperature value may include a first temperature value of the battery 11 during the discharging process and / or a second temperature value of the battery 11 during the charging process; correspondingly, the temperature threshold may include a first temperature threshold and a second temperature threshold.

[0044] Specifically, the temperature of battery 11 can be monitored using temperature sensors. Battery 11 includes multiple cells, and by placing one or more temperature sensors at designated locations on battery 11, the temperature of battery 11 can be monitored. For example, battery 11 includes 14 cells connected in series. A temperature sensor is placed at the top seal of the middle cell to measure the highest temperature of battery 11, and a temperature sensor is placed at the top seal of the end cells to detect the lowest temperature of battery 11.

[0045] In this application, the application scenarios of battery 11 include at least ordinary user scenarios and professional user scenarios. In ordinary user scenarios, battery 11 will be charged in a low-temperature environment, while in professional user scenarios, battery 11 will be discharged at high temperature and high voltage. Based on this, battery management system 12 can determine whether the application scenario of battery 11 is a professional user scenario by using a first temperature value and a first temperature threshold during the discharge process of battery 11, and determine whether the application scenario of battery 11 is an ordinary user scenario by using a second temperature value and a second temperature threshold during the charging process of battery 11. When the application scenario of battery 11 is a professional user scenario, battery management system 12 needs to adjust the charging limit voltage of battery 11 to prevent overcharging of battery 11, for example, by lowering the charging limit voltage of battery 11. When the application scenario of battery 11 is an ordinary user scenario, battery management system 12 needs to adjust the discharge limit voltage of battery 11 to prevent over-discharge of battery 11, for example, by increasing the discharge limit voltage of battery 11.

[0046] Optionally or additionally, in this application, an effective cycle condition refers to a cycle condition in which, after one charge-discharge cycle, the discharge capacity of battery 11 is greater than a capacity threshold during the discharge process. The number of effective cycles can represent the cumulative number of effective cycle conditions performed by battery 11. The effective charging voltage can be the actual upper limit voltage of battery 11 during charging in an effective cycle condition. The effective discharging voltage can be the actual lower limit voltage of battery 11 during discharging in an effective cycle condition.

[0047] Optionally or additionally, the upper voltage threshold can represent the design threshold for the upper voltage of the battery. For example, for a ternary lithium battery, the upper voltage threshold is set to 4.35V. Furthermore, the upper voltage threshold can also be a value considering both the design threshold and the safe operating boundary. For the safety of the battery during actual use, the upper voltage threshold is usually lowered as the upper voltage threshold during actual use. For example, for a ternary lithium battery, the upper voltage threshold is set to 4.34V, 4.32V, or 4.3V.

[0048] Optionally or additionally, the lower voltage threshold can represent the design threshold for the lower voltage of the battery. For example, for a ternary lithium battery, the lower voltage threshold is set to 3.0V. Furthermore, the lower voltage threshold can also be a value considering both the design threshold and the safe operating boundary. For the safety of the battery during actual use, the lower voltage threshold is typically increased to serve as the actual lower voltage threshold during use. For example, for a ternary lithium battery, the lower voltage threshold is set to 3.05V, 3.1V, or 3.2V.

[0049] The charging limit voltage adjustment gain represents the absolute value of the difference between the effective charging voltage and the upper voltage threshold. The discharging limit voltage adjustment gain represents the absolute value of the difference between the effective discharging voltage and the lower voltage threshold. By determining the charging limit voltage adjustment gain and the discharging limit voltage adjustment gain, issues arising from over-adjusting the charging limit voltage and / or discharging limit voltage can be avoided. This would not only affect the actual discharge capacity of battery 11 and the user's experience with the product's battery life, but also ensure the safety, reliability, and cycle life of battery 11.

[0050] The battery management system 12 determines the application scenario of the battery 11 based on the first temperature value of the battery 11 during the discharge process and / or the second temperature value of the battery 11 during the charging process. It then dynamically adjusts the charging limit voltage or discharging limit voltage of the battery 11 according to the application scenario, so that the battery 11 can dynamically adapt to its usage scenario. This can improve the user experience while ensuring the safety, reliability and cycle life of the battery 11.

[0051] Figure 4 This is a flowchart illustrating a battery usage method according to this application. The battery usage method can be applied to a battery management system (such as...). Figure 3 The battery management system (12) in the middle. Figure 4 As shown, the battery usage method may include the following steps. It is understood that the order of the steps in this flowchart may be changed depending on different needs.

[0052] S11, Read the historical usage data of battery 11 and determine the temperature value of battery 11. The temperature value includes the first temperature value of battery 11 during the discharge process and / or the second temperature value of battery 11 during the charging process.

[0053] In some optional embodiments, the historical usage data of battery 11 may include: effective cycle conditions, effective number of cycles, effective charging voltage, effective discharging voltage, upper voltage threshold, lower voltage threshold, charging limit voltage adjustment gain, discharging limit voltage adjustment gain, and the temperature value of battery 11. Based on the historical usage data, the temperature value of battery 11 can be determined. The relevant content regarding effective cycle conditions, effective number of cycles, effective charging voltage, effective discharging voltage, upper voltage threshold, lower voltage threshold, charging limit voltage adjustment gain, discharging limit voltage adjustment gain, and the temperature value of battery 11 has been described in detail above and will not be repeated here.

[0054] Optionally or additionally, the temperature value may include a first temperature value of the battery 11 during the discharge process, the first temperature value including the maximum temperature value of the battery 11 during the discharge process, the discharge process including the battery 11 from the start time of discharge to the end time of discharge.

[0055] The discharge process indicates that battery 11 is performing a discharge operation, i.e., supplying power to the electrical device. The discharge of battery 11 can be determined based on the magnitude and direction of the current in the main circuit. For example, the current range of battery 11 when at rest can be determined, such as -100mA < I < 100mA. When the detected current is outside this range, it can be determined that battery 11 is in a charging or discharging process. Taking the current flow direction as positive when battery 11 is charging, if the detected current in the main circuit is less than or equal to -100mA, it indicates that battery 11 is in a discharging process. The start time of the discharge process is called the discharge start time, and the end time of the discharge process is called the discharge end time.

[0056] By monitoring the maximum temperature value of battery 11 during the discharge process, it is determined whether battery 11 is discharging at high temperature, and then it is determined whether battery 11 is suitable for professional user scenarios, thereby improving the accuracy of determining the application scenario of battery 11.

[0057] In some optional embodiments, the temperature value may also include a second temperature value of the battery 11 during the charging process, the second temperature value including the minimum temperature value of the battery 11 during the charging process, the charging process including the battery 11 from the start time of charging to the end time of charging.

[0058] The charging process indicates that battery 11 is performing a charging operation. The charging process can be determined based on the magnitude and direction of the charging and discharging current in the main circuit. Continuing with the above embodiment, if the current detected in the main circuit is greater than or equal to 100mA, it indicates that battery 11 is in the charging process. The start time of the charging process is called the charging start time, and the end time of the charging process is called the charging end time.

[0059] By monitoring the minimum temperature value of battery 11 during the charging process, it is determined whether battery 11 is being charged at low temperatures, and thus whether battery 11 is used in a typical user scenario, thereby improving the accuracy of determining the application scenario of battery 11.

[0060] Understandably, the main circuit in this application refers to the power circuit, that is, the current path when the battery 11 supplies power to the load in the electrical device, and the current path when the charging device charges the battery 11.

[0061] Optionally or additionally, historical usage data of battery 11 can be read to determine the temperature value of battery 11, including: determining a first temperature value of battery 11 under effective cycle conditions, and / or determining a second temperature value of battery 11 under effective cycle conditions.

[0062] Effective cycle condition characterizes the cycle condition in which, after one charge-discharge cycle, the discharge capacity of battery 11 exceeds a capacity threshold during the discharge process. The capacity threshold can be set according to actual needs; for example, the capacity threshold may include 45%, 50%, 55% of the rated capacity of battery 11, etc.

[0063] The effective cycle condition includes the charging and discharging processes of battery 11, and during the discharging process, the discharge capacity of battery 11 is greater than the capacity threshold. In some examples, determining the first temperature value of battery 11 under the effective cycle condition may include: acquiring the maximum temperature value of battery 11 during the discharge process of the effective cycle condition when it is detected that battery 11 is under the effective cycle condition.

[0064] In some examples, determining a second temperature value for battery 11 under effective cycling conditions may include: acquiring the minimum temperature value of battery 11 during the charging process under effective cycling conditions when battery 11 is detected to be under effective cycling conditions.

[0065] By determining the first and / or second temperature values ​​of the battery 11 during its effective cycle operation, the battery 11 can be filtered out during shallow charging and discharging scenarios such as equipment trial use or equipment relocation. This ensures that the collected temperature and charge / discharge information comes from typical operating conditions in actual applications, avoiding misjudgments of user behavior and thus improving the accuracy of the analysis of the application scenario in which the battery 11 is located.

[0066] S12, compare the temperature value of battery 11 with the temperature threshold, and adjust the charging limit voltage or discharging limit voltage of battery 11 according to the comparison result.

[0067] Optionally or additionally, the temperature threshold may include a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold.

[0068] In this application, the first temperature threshold can be used to determine whether the battery 11 is used in a professional user scenario. That is, the first temperature threshold characterizes the temperature value that the battery 11 can reach during use, such as the temperature boundary value that the battery 11 can reach when discharging under continuous and concentrated use by a professional user. Understandably, the first temperature threshold can be related to the temperature exhibited by the battery 11 during operation, particularly the temperature value exhibited by the battery 11 during high-current discharge. Therefore, the first temperature threshold can be based on the temperature value of the battery 11 during high-current discharge; for example, the first temperature threshold can be a value taken from [60℃, 90℃]. The second temperature threshold can be used to determine whether the battery 11 is used in a general user scenario, such as the temperature value of the battery 11 at the start of charging, particularly the temperature value that the battery 11 can reach when charging in a low-temperature environment. Therefore, the second temperature threshold is less than the first temperature threshold, and the second temperature threshold can be a value taken from [-20℃, 20℃].

[0069] In some optional examples, where the application scenario of battery 11 is a professional user scenario, in order to prevent battery 11 from operating at high temperature and high voltage, the battery management system 12 limits the voltage of battery 11. For example, when charging battery 11, the battery voltage is monitored and the charging limit voltage of battery 11 is adjusted to prevent battery 11 from being overcharged. Specifically, the charging limit voltage of battery 11 can be reduced in response to a first temperature value being greater than a first temperature threshold; and the charging limit voltage of battery 11 can be kept unchanged in response to a first temperature value being less than or equal to the first temperature threshold.

[0070] If the first temperature value of battery 11 is greater than the first temperature threshold, it is determined that battery 11 will experience high-temperature discharge, thus confirming that battery 11 is in a professional user scenario. In this scenario, the charging limit voltage of battery 11 is reduced so that it is less than the upper voltage threshold. Specifically, the battery management system 12 obtains the currently recorded charging limit voltage and reduces it according to the first step length. The battery management system 12 records and updates the actual upper charging voltage (i.e., charging limit voltage) of battery 11 during effective cycle conditions. The first step length can be set according to actual needs, for example, 0.05V, 0.1V, 0.15V, etc., and is not limited here.

[0071] In some optional examples, before reducing the currently recorded charging limit voltage according to the first step length, the adjustment gain of the currently recorded charging limit voltage can be obtained. Based on the adjustment gain and the first step length, it is determined whether to reduce the currently recorded charging limit voltage. For example, the sum of the adjustment gain and the first step length (referred to as the "first sum" for ease of description) is obtained. If the first sum is greater than a first gain threshold, it indicates that continuing to reduce the charging limit voltage by the first step length would cause the adjustment of the charging limit voltage to exceed the design margin, resulting in reduced operating efficiency of the battery 11 and affecting user experience. Therefore, the first step length can be reduced to adjust the currently recorded charging limit voltage (e.g., adjusting the first step length from 0.1V to 0.05V), or the currently recorded charging limit voltage can be kept unchanged. If the first sum is less than or equal to the first gain threshold, it indicates that continuing to reduce the charging limit voltage will not cause the adjustment of the charging limit voltage to exceed the design margin, and the currently recorded charging limit voltage can continue to be reduced according to the first step length. The first gain threshold can be set according to actual needs and is not limited here.

[0072] For example, taking a battery voltage upper limit threshold of 4.3V, a first step length of 0.05V, a first gain threshold of 0.15V, and a currently recorded charging limit voltage of 4.2V as an example, the charging limit voltage of 4.2V is obtained after two executions of reducing the charging limit voltage based on the first step length. Before the third execution of reducing the charging limit voltage based on the first step length, the currently recorded charging limit voltage adjustment gain is obtained as 4.3V - 4.2V = 0.1V, and the sum of the currently recorded charging limit voltage adjustment gain and the first step length is obtained as 0.1V + 0.05V = 0.15V. Since the sum of 0.15V equals the first gain threshold, the operation of reducing the charging limit voltage based on the first step length can be executed a third time, thus updating the currently recorded charging limit voltage to 4.15V. Before the fourth execution of reducing the charging limit voltage based on the first step length, the currently recorded charging limit voltage adjustment gain is obtained as 4.3V - 4.15V = 0.15V, and the sum of the currently recorded charging limit voltage adjustment gain and the first step length is obtained as 0.15V + 0.05V = 0.2V. Since the sum of 0.2V is greater than the first gain threshold of 0.15V, the fourth execution of reducing the charging limit voltage based on the first step length is rejected. Thus, the currently recorded charging limit voltage is maintained at 4.15V, and 4.15V is still used as the charging limit voltage for subsequent battery charging.

[0073] In some alternative examples, before reducing the currently recorded charging limit voltage according to the first step length, the method further includes: if the difference between the currently recorded charging limit voltage and the first step length is less than a first boundary threshold, it indicates that continuing to reduce the charging limit voltage would cause the adjustment of the charging limit voltage to exceed the design margin, thereby reducing the operating efficiency of battery 11 and affecting the user experience. Therefore, the first step length can be reduced to adjust the currently recorded charging limit voltage (e.g., adjusting the first step length from the original 0.1V to 0.05V), or the currently recorded charging limit voltage can be kept unchanged; if the difference between the currently recorded charging limit voltage and the first step length is greater than or equal to the first boundary threshold, it indicates that continuing to reduce the charging limit voltage will not cause the adjustment of the charging limit voltage to exceed the design margin, and the currently recorded charging limit voltage can be reduced according to the first step length. The first boundary threshold can be set according to actual needs and is not limited here.

[0074] For example, taking a battery voltage upper limit threshold of 4.3V, a first step length of 0.05V, a first boundary threshold of 4.15V, and a currently recorded charging limit voltage of 4.2V as an example, the charging limit voltage of 4.2V is obtained after two executions of reducing the charging limit voltage based on the first step length. Before the third execution of reducing the charging limit voltage based on the first step length, the charging limit voltage after the third reduction is obtained as 4.15V. Since 4.15V is equal to the first boundary threshold, the operation of reducing the charging limit voltage based on the first step length can be executed for the third time, thus updating the currently recorded charging limit voltage to 4.15V. Before the fourth execution of reducing the charging limit voltage based on the first step length, the charging limit voltage after the fourth reduction is obtained as 4.1V. Since 4.1V is less than the first boundary threshold of 4.15V, the operation of reducing the charging limit voltage based on the first step length for the fourth time is rejected. Thus, the currently recorded charging limit voltage remains at 4.15V and is still used as the charging limit voltage for subsequent battery charging.

[0075] When the first temperature value of battery 11 is greater than the first temperature threshold, it is determined that battery 11 is in a professional user scenario. By reducing the charging limit voltage of battery 11, the problem of battery 11 discharging under high temperature and high voltage can be improved, the structure of the positive electrode material of battery 11 is prevented from being damaged under high temperature, the capacity decay of battery 11 is reduced, and the cycle life of battery 11 is improved.

[0076] In some optional examples, the application scenario of battery 11 can be determined as a typical user scenario based on a second temperature value and a second temperature threshold during the charging process. If the application scenario of battery 11 is a typical user scenario, to prevent battery 11 from charging under low temperature and low voltage conditions, the battery management system 12 limits the discharge limit voltage of battery 11. For example, when battery 11 is discharging, the discharge limit voltage of battery 11 is adjusted to prevent over-discharge. Specifically, the discharge limit voltage of battery 11 can be increased in response to a second temperature value being lower than the second temperature threshold; and the discharge limit voltage of battery 11 can be kept constant in response to a second temperature value being greater than or equal to the second temperature threshold.

[0077] If the second temperature value of battery 11 is less than the second temperature threshold, it is determined that battery 11 will experience low-temperature charging, thus confirming that battery 11 is in a normal user scenario. When battery 11 is in a normal user scenario, the discharge limit voltage of battery 11 is increased, making it greater than the lower voltage threshold. Specifically, the battery management system 12 obtains the currently recorded discharge limit voltage and increases it according to the second step size. The battery management system 12 records and updates the actual lower discharge limit voltage (i.e., discharge limit voltage) of battery 11 during effective cycle conditions. The second step size can be set according to actual needs, for example, 0.05V, 0.1V, 0.15V, 0.2V, etc., and is not limited here.

[0078] In some examples, before increasing the currently recorded discharge limit voltage according to the second step size, the adjustment gain of the currently recorded discharge limit voltage can be obtained. Based on the adjustment gain and the second step size, it is determined whether to increase the currently recorded discharge limit voltage. For example, the sum of the adjustment gain and the second step size (hereinafter referred to as the "second sum") is obtained. If the second sum is greater than the second gain threshold, it indicates that continuing to increase the discharge limit voltage will cause the adjustment of the discharge limit voltage to exceed the design margin, resulting in a decrease in the operating efficiency of battery 11 and affecting the user experience. Therefore, the second step size can be reduced to adjust the currently recorded discharge limit voltage (e.g., adjusting the second step size from 0.1V to 0.05V), or the currently recorded discharge limit voltage can be kept unchanged. If the second sum is less than or equal to the second gain threshold, it indicates that continuing to increase the discharge limit voltage will not cause the adjustment of the discharge limit voltage to exceed the design margin, and the currently recorded discharge limit voltage can continue to be increased according to the second step size. The second gain threshold can be set according to actual needs and is not limited here.

[0079] For example, taking a battery voltage lower limit threshold of 3.1V, a second step size of 0.1V, a second gain threshold of 0.2V, and a currently recorded discharge limit voltage of 3.2V as an example, the discharge limit voltage of 3.2V is obtained after the first execution of increasing the discharge limit voltage according to the second step size. Before the second execution of increasing the discharge limit voltage according to the second step size, the currently recorded discharge limit voltage adjustment gain is obtained as 3.2V - 3.1V = 0.1V, and the sum of the currently recorded discharge limit voltage adjustment gain and the second step size is obtained as 0.1V + 0.1V = 0.2V. Since the sum of 0.2V equals the second gain threshold, the operation of increasing the discharge limit voltage according to the second step size can be executed a second time, thus updating the currently recorded discharge limit voltage to 3.3V. Before the third execution of increasing the discharge limit voltage according to the second step length, the currently recorded discharge limit voltage adjustment gain is obtained as 3.3V - 3.1V = 0.2V, and the sum of the currently recorded discharge limit voltage adjustment gain and the second step length is obtained as 0.2V + 0.1V = 0.3V. Since the sum of 0.3V is greater than the second gain threshold of 0.2V, the operation of increasing the discharge limit voltage according to the second step length is rejected for the third execution. Thus, the currently recorded discharge limit voltage is maintained at 3.3V, and 3.3V is still used as the discharge limit voltage for the battery during subsequent discharge.

[0080] In some alternative examples, before increasing the currently recorded discharge limit voltage according to the second step size, the method further includes: if the sum of the currently recorded discharge limit voltage and the second step size (hereinafter referred to as the "third sum" for ease of description) is greater than a second boundary threshold, it indicates that continuing to increase the discharge limit voltage will cause the adjustment of the discharge limit voltage to exceed the design margin, thereby reducing the operating efficiency of battery 11 and affecting the user experience. Therefore, the second step size can be reduced to adjust the currently recorded discharge limit voltage (e.g., the second step size can be adjusted from the original 0.1V to 0.05V), or the currently recorded discharge limit voltage can be kept unchanged; if the third sum is less than or equal to the second boundary threshold, it indicates that continuing to increase the discharge limit voltage will not cause the adjustment of the discharge limit voltage to exceed the design margin, and the currently recorded discharge limit voltage can be increased according to the second step size. The second boundary threshold can be set according to actual needs and is not limited here.

[0081] For example, taking a battery voltage lower limit threshold of 3.1V, a second step size of 0.1V, a second boundary threshold of 3.3V, and a currently recorded discharge limit voltage of 3.2V as an example, the discharge limit voltage of 3.2V is obtained after the first execution of increasing the discharge limit voltage according to the second step size. Before the second execution of increasing the discharge limit voltage according to the second step size, the discharge limit voltage after the second increase is obtained as 3.3V. Since 3.3V is equal to the second boundary threshold of 3.3V, the operation of increasing the discharge limit voltage according to the second step size can be executed a second time, thus updating the currently recorded discharge limit voltage to 3.3V. Before the third execution of increasing the discharge limit voltage according to the second step size, the discharge limit voltage after the third increase is obtained as 3.4V. Since 3.4V is greater than the second boundary threshold of 3.3V, the operation of increasing the discharge limit voltage according to the second step size is rejected for the third time. Thus, the currently recorded discharge limit voltage remains at 3.3V and is still used as the discharge limit voltage for subsequent battery discharge.

[0082] When the second temperature value of battery 11 is less than the first temperature threshold, it is determined that battery 11 is in a normal user scenario. By increasing the discharge limit voltage of battery 11, the depth of discharge of battery 11 is prevented from being too large and the battery voltage is too low during discharge. This allows the negative electrode of battery 11 to retain some lithium ions, thereby improving the situation of lithium plating that occurs during the next low-temperature charging of battery 11. This prevents lithium plating during low-temperature charging from puncturing the separator and causing safety risks to battery 11.

[0083] For example, the battery 11 is designed with a charging limit voltage (i.e., upper voltage threshold) of 4.35V and a discharging limit voltage (i.e., lower voltage threshold) of 3.0V. In actual use, for safety reasons, the battery management system 12 will lower the charging limit voltage and raise the discharging limit voltage. For example, the actual charging limit voltage will be adjusted to 4.25V, and the actual discharging limit voltage will be increased to 3.1V. Based on this, when the battery 11 is charged to 4.25V or discharged to 3.1V, the battery management system 12 will turn off the charging / discharging switch, and the battery 11 will not be able to continue charging or discharging. When the battery 11 is charged to 4.25V, the SOC displayed to the user is 100%; when the battery 11 is discharged to 3.1V, the SOC displayed to the user is also 100%.

[0084] In this application, in response to a first temperature value of battery 11 being greater than a first temperature threshold, the battery management system 12 determines that battery 11 is being used in a professional user scenario, obtains the currently recorded charging limit voltage, and lowers the charging limit voltage of battery 11, for example, lowering it from 4.25V to 4.2V. In response to a second temperature value of battery 11 being less than a second temperature threshold, the battery management system 12 determines that battery 11 is being used in a normal user scenario, obtains the currently recorded discharge limit voltage, and increases the discharge limit voltage of battery 11, for example, increasing it from 3.1V to 3.2V.

[0085] In the battery 11 usage method provided in this application, the application scenario of the battery 11 is determined based on the first temperature value of the battery 11 during the discharge process and / or the second temperature value of the battery 11 during the charging process. The charging limit voltage or discharging limit voltage of the battery 11 is then dynamically adjusted according to the application scenario, so that the battery 11 can dynamically adapt to its application scenario and improve the reliability of the battery 11.

[0086] Furthermore, the application scenario of battery 11 can change, that is, battery 11 can change from a professional user scenario to a general user scenario, or vice versa. For example, a professional user might sell battery 11 after using it for a certain number of charge-discharge cycles, say 800. A general user might then purchase a used battery and connect it to their personal drone, thus changing the use of battery 11 from a professional user scenario to a general user scenario. Alternatively, a general user might rent their drone or the battery 11 from their drone to a professional user, changing the use of battery 11 from a general user scenario to a professional user scenario. Upon the expiration of the rental period or for other reasons, the drone or the battery 11 belonging to the general user returns to them, thus changing the use of battery 11 from a professional user scenario to a general user scenario. Therefore, battery 11 can switch between general user scenarios and professional user scenarios.

[0087] In some optional examples, taking the change of battery 11 from a professional user scenario to a general user scenario as an example, because battery 11 has undergone multiple charge-discharge cycles in the professional user scenario, battery 11 may discharge under high temperature and high pressure. Therefore, battery management system 12 may lower the charging limit voltage of battery 11 once or multiple times. After lowering the charging limit voltage of battery 11, in response to the fact that the number of times the second temperature value is lower than the second temperature threshold within the first duration is greater than the first value, the charging limit voltage of battery 11 is increased, and the discharging limit voltage of battery 11 is increased.

[0088] In this application, the second temperature threshold is lower than the first temperature threshold. The first duration and the first value can be set according to actual needs. For example, the first duration can be 3 days, 5 days, 7 days, 10 days, etc., and the first value can be 1 time, 3 times, 4 times, 6 times, etc., depending on the actual usage of the battery 11. If the number of times the second temperature value is lower than the second temperature threshold within the first duration is greater than the first value, it indicates that the current usage scenario of the battery 11 is a typical user scenario, and the charging limit voltage and discharging limit voltage of the battery 11 need to be increased to allow the battery 11 to dynamically adapt to its usage scenario and improve the reliability of the battery 11.

[0089] In some optional examples, taking the change of battery 11 from a normal user scenario to a professional user scenario as an example, because battery 11 has undergone multiple charge and discharge cycles in the normal user scenario, battery 11 may be charged at low temperatures. Therefore, battery management system 12 may increase the discharge limit voltage of battery 11 once or multiple times. After increasing the discharge limit voltage of battery 11, further, in response to the fact that the number of times the first temperature value is greater than the first temperature threshold within the second duration is greater than the second value, the charging limit voltage and the discharge limit voltage of battery 11 are reduced.

[0090] The second duration and the second value can be set according to actual needs. For example, the second duration can be 3 days, 5 days, 7 days, 10 days, etc., and the second value can be 1 time, 3 times, 4 times, 6 times, etc., depending on the actual usage of battery 11. If the number of times the first temperature value exceeds the first temperature threshold is greater than the second value within the second duration, it indicates that battery 11 is currently used in a professional user scenario, and the charging limit voltage and discharging limit voltage of battery 11 need to be reduced to allow battery 11 to dynamically adapt to its usage scenario and improve the reliability of battery 11.

[0091] Figure 5 This is a schematic diagram of the battery management system provided in this application. Figure 5 As shown, the battery usage method is applied to a battery management system 12, which includes a memory 121, a controller 122, and at least one communication bus 123. The controller 122 is coupled to the memory 121 via the communication bus 123.

[0092] In some embodiments, the battery management system 12 is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits, programmable gate arrays, digital processors, and embedded devices.

[0093] In some embodiments, memory 121 is used to store one or more computer programs. The one or more computer programs are configured to be executed by controller 122. The one or more computer programs include multiple instructions that, when executed by controller 122, implement a battery usage method performed on battery management system 12.

[0094] In some embodiments, memory 121 includes read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0095] In some embodiments, the controller 122 provides computing and control capabilities, for example, the controller 122 is used to execute a computer program stored in the memory 121 to implement the battery usage method described above.

[0096] In some embodiments, at least one controller 122 is the control unit of the battery management system 12, connecting various components of the battery management system 12 via various interfaces and lines. It executes programs or modules stored in the memory 121 and calls data stored in the memory 121 to perform various functions and process data within the battery management system 12. For example, when at least one controller 122 executes a computer program stored in the memory, it implements all or part of the steps of the battery usage method in this embodiment. At least one controller 122 may be composed of integrated circuits, such as a single-packaged integrated circuit or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips.

[0097] In some embodiments, this application also provides a computer-readable storage medium, which may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, etc.; and the data storage area may store data created based on the use of the battery management system 12, etc.

[0098] The integrated unit implemented as a software functional module described above can be stored in a computer-readable storage medium. This software functional module, stored in a storage medium, includes several instructions to cause the battery management system or processor to execute portions of the methods of the various embodiments of this application.

[0099] In some embodiments, this application also provides a battery device, which includes a battery and the battery management system 12 described above. The battery management system 12 can determine the temperature value of the battery 11, compare the temperature value of the battery 11 with a temperature threshold to obtain a comparison result, and adjust the charging limit voltage or discharging limit voltage of the battery 11 according to the comparison result.

[0100] In some embodiments, this application also provides an electrical device that may include the battery device described in the above embodiments. As an example, the electrical device may be an agricultural drone that includes a battery device.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and other division methods may be used in actual implementation.

[0102] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0103] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional modules.

[0104] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other elements or, and the singular does not exclude the plural. Multiple elements or devices recited in the specification may also be implemented by a single element or device through software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A method of using a battery, characterized in that, The method includes: Read the historical usage data of the battery to determine the temperature value of the battery, the temperature value including a first temperature value of the battery during the discharge process and / or a second temperature value of the battery during the charging process; The battery temperature value is compared with a temperature threshold, and the charging limit voltage or discharging limit voltage of the battery is adjusted according to the comparison result.

2. The method of using the battery according to claim 1, characterized in that, The first temperature value includes the maximum temperature value of the battery during the discharge process, the discharge process including the battery from the start time of discharge to the end time of discharge; and / or The second temperature value includes the minimum temperature value of the battery during the charging process, which includes the battery from the start of charging to the end of charging.

3. The method of using the battery according to claim 1 or 2, characterized in that, The method includes: In response to the first temperature value being greater than a first temperature threshold, the charging limit voltage of the battery is reduced.

4. The method of using the battery according to claim 3, characterized in that, Before lowering the charging limit voltage of the battery, the method further includes: The sum of the currently recorded charging limit voltage adjustment gain and the first step length is determined to be the first sum value; In response to the first sum being less than or equal to a first gain threshold, the charging limit voltage of the battery is reduced according to the first step length; or Determine the difference between the currently recorded charging limit voltage and the length of the first step; In response to the difference being greater than or equal to a first boundary threshold, the charging limit voltage of the battery is reduced according to the first step length.

5. The method of using the battery according to claim 3, characterized in that, After reducing the charging limit voltage of the battery, the method further includes: In response to the fact that the number of times the second temperature value is less than the second temperature threshold is greater than the first value within a first time period, the charging limit voltage of the battery is increased, and the discharging limit voltage of the battery is increased. Wherein, the second temperature threshold is less than the first temperature threshold.

6. The method of using the battery according to claim 1 or 2, characterized in that, The method includes: In response to the second temperature value being less than the second temperature threshold, the discharge limit voltage of the battery is increased.

7. The method of using the battery according to claim 6, characterized in that, Before increasing the discharge limit voltage of the battery, the method further includes: The sum of the currently recorded discharge limit voltage adjustment gain and the second step size is determined to be the second sum value; In response to the second sum being less than or equal to the second gain threshold, the discharge limit voltage of the battery is increased according to the second step size; or The sum of the currently recorded discharge limit voltage and the second step size is determined to be the third sum value; In response to the third sum being less than or equal to the second boundary threshold, the discharge limit voltage of the battery is increased according to the second step size.

8. The method of using the battery as described in claim 6, characterized in that, After increasing the discharge limit voltage of the battery, the method further includes: In response to the fact that the number of times the first temperature value is greater than the first temperature threshold is greater than the second value within the second time period, the charging limit voltage and the discharging limit voltage of the battery are reduced. Wherein, the first temperature threshold is greater than the second temperature threshold.

9. The method of using the battery according to any one of claims 1 to 8, characterized in that, The step of reading the battery's historical usage data to determine the battery's temperature value includes: Determine the first temperature value of the battery under effective cycle conditions, and / or determine the second temperature value of the battery under effective cycle conditions; The effective cycle condition refers to the cycle in which the battery's discharge capacity is greater than the capacity threshold during the discharge process after one charge-discharge cycle.

10. A battery management system, characterized in that, The system includes a controller and a memory, the controller being configured to execute a computer program stored in the memory, such that the battery management system implements the battery usage method as described in any one of claims 1 to 9.

11. A battery device, characterized in that, Includes the battery and the battery management system as described in claim 10.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11.

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