Method and system for relieving early degradation of battery, battery management system and medium

Abstract

The invention discloses a method, system, equipment and medium for relieving early degradation of a battery, and the method comprises the steps: collecting the cycle index or / and health index change trend of the battery from the beginning of charging or using the battery on an electric device for the first time, and comparing the cycle index or / and health index change trend with a corresponding threshold value; determining whether the battery is in an early running-in stage according to a comparison result; when the battery is in an early running-in stage, a running-in limiting mode is applied to the battery, and the running-in limiting mode comprises the following limiting measures which are implemented at the same time: (1) limiting the SOC range of the battery; (2) limiting the charge-discharge rate of the battery; (3) controlling the temperature of the battery; after the battery ends the early run-in phase, nominal performance metrics are applied to control charging and use of the battery. By adopting the technical scheme, strict battery performance limitation is implemented from the beginning of putting the battery into use, namely the early running-in stage of the battery application, and battery degradation can be better inhibited in the life cycle stage with the relatively high degradation rate of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management systems, and in particular to a method for alleviating early battery degradation, a system thereof, a battery management system, and a medium. Background Art

[0002] At this stage, electric vehicles have been accepted and recognized by people, and the market share of electric vehicles has increased rapidly. Batteries are the core components of electric vehicles. With the rapid development of electric vehicles, research on electric vehicle batteries has continued to deepen.

[0003] The attenuation problem of electric vehicle power batteries is one of the main reasons restricting the development of electric vehicles. The attenuation and degradation of power batteries will lead to a decline in the performance indicators of power batteries, including a decrease in battery capacity and a decrease in charge and discharge rates, which seriously restricts the user experience of electric vehicles and the service life of electric vehicles.

[0004] At present, in order to prevent the rapid degradation of power batteries, many types of battery management systems (BMS) have been proposed for use during the charging and use of power batteries, for example, to limit the charge and discharge rates of power batteries. However, there are also certain problems in the application of these battery management systems. Since the rate of battery degradation may be different at different stages of the battery life cycle, and these currently used battery management systems use the same or similar degradation suppression schemes throughout the battery life cycle, the suppression effect on battery degradation is weaker in the life cycle stages with faster battery degradation rates, while in the life cycle stages with slower battery degradation rates, the user experience is weakened due to the limited battery performance. Summary of the Invention

[0005] Purpose of the invention: The present invention provides a method for alleviating early battery degradation and its system, battery management system and medium, aiming to solve the problem in the prior art that the same or similar degradation suppression schemes are used throughout the battery life cycle, resulting in a weak suppression effect on battery degradation during the life cycle stage with a faster battery degradation rate.

[0006] Technical Solution: The present invention provides a method for mitigating early battery degradation, comprising: collecting the number of battery cycles and / or health indicator change trends from the time the battery is first charged or used in an electric device, comparing the data with corresponding thresholds, and determining whether the battery is in an early running-in stage based on the comparison results; when the battery is in the early running-in stage, applying a running-in restriction mode to the battery, the running-in restriction mode including the following concurrently implemented restriction measures:

[0007] (1) Limiting the battery SOC range: During the charging process, the available power after charging is controlled to be less than the available capacity of the battery;

[0008] (2) Limiting the battery charge and discharge rate: During the battery charging process, the actual charge rate is controlled to be less than the maximum charge rate;

[0009] (3) Control battery temperature: When the battery temperature is outside the protection temperature range, control the actual charging rate to be less than the maximum charging rate, or stop charging until the battery temperature reaches the protection temperature range;

[0010] After the battery has completed the early run-in phase, the nominal performance indicators are applied to control the charging and use of the battery.

[0011] Specifically, if the number of cycles is less than or equal to a corresponding threshold, it is determined that the battery is in the early running-in stage.

[0012] Specifically, the health indicator change trend includes at least one of the following: internal resistance change rate, impedance change rate, capacity retention rate change rate and coulombic efficiency change rate; if the health indicator change trend is greater than the corresponding threshold, it is determined that the battery is in the early running-in stage.

[0013] Specifically, limiting the battery charge and discharge rate includes: controlling the actual output power to be less than the maximum output power during battery use.

[0014] Specifically, it also includes: when applying a running-in restriction mode to the battery, as the number of battery cycles increases or the trend of changes in health indicators decreases, the restrictions on the battery are gradually relaxed until the end of the early running-in stage, and the nominal performance indicators are applied to control the charging and use of the battery.

[0015] Specifically, the degree of relaxation of restrictions on batteries is positively correlated with the increased number of battery cycles, or negatively correlated with the changing trend of health indicators.

[0016] Specifically, the restrictions on batteries will be gradually relaxed, including: gradually controlling the available power after charging to reach the available capacity of the battery; and gradually controlling the actual charging rate to reach the maximum charging rate.

[0017] The present invention also provides a system for mitigating early battery degradation, comprising: a parameter collection and early running-in stage confirmation unit, a running-in restriction application unit, and a user interaction unit, wherein: the parameter collection and early running-in stage confirmation unit is used to collect the number of battery cycles and / or health indicator change trends since the battery first starts charging or using the electric device, and compare them with corresponding thresholds, and determine whether the battery is in the early running-in stage based on the comparison results; after the battery ends the early running-in stage, the nominal performance indicators are applied to control the charging and use of the battery; the running-in restriction application unit is used to apply a running-in restriction mode to the battery when the battery is in the early running-in stage, and the running-in restriction mode includes the following restriction measures that are implemented simultaneously:

[0018] (1) Limiting the battery SOC range: During the charging process, the available power after charging is controlled to be less than the available capacity of the battery;

[0019] (2) Limiting the battery charge and discharge rate: During the battery charging process, the actual charge rate is controlled to be less than the maximum charge rate;

[0020] (3) Control battery temperature: When the battery temperature is outside the protection temperature range, control the actual charging rate to be less than the maximum charging rate, or stop charging until the battery temperature reaches the protection temperature range;

[0021] The user interaction unit is used to prompt the user that the battery is currently applying a running-in restriction mode through a user interaction interface when the battery is in the early running-in stage.

[0022] The present invention also provides a battery management system, comprising a memory and a processor, wherein the memory stores a computer program executable by the processor. When the computer program is executed by the processor, any one of the methods for mitigating premature battery degradation provided by the present invention is executed. The battery management system is configured to execute the method for mitigating premature battery degradation in a local electronic device or a cloud server.

[0023] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any one of the methods for alleviating premature battery degradation provided by the present invention are implemented. The processor is configured in a local electronic device or a cloud server.

[0024] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: from the time the battery is put into use, that is, in the early running-in stage of the battery application, stricter battery performance restrictions are implemented, which can better suppress battery degradation in the life cycle stage when the battery degradation rate is faster; further, during the early running-in stage of the battery, the performance restrictions on the battery are gradually relaxed, thereby improving the user experience while avoiding rapid battery degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic flow chart of the method for alleviating early battery degradation provided by the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0027] See Figure 1 , which is a flow chart of the method for alleviating early battery degradation provided by the present invention.

[0028] In a specific implementation, the method provided by the present invention can be applied to a variety of lithium-ion chemical systems, such as lithium iron phosphate LFP, ternary material NCA and nickel-cobalt-manganese ternary NMC.

[0029] In specific implementations, based on battery research in relevant technical literature, the total life of lithium-ion batteries can be predicted with an average error of less than 9% based on data from the first 100 cycles of the previous battery. In some data sets, "long-life batteries" and "short-life batteries" can be effectively classified using only the first five cycles. These studies show that features learned from the early cycles of batteries can effectively predict the performance of batteries throughout their life cycle, which also provides the technical basis for the technical solution of the present invention.

[0030] The present invention goes a step further based on this learning and prediction, and actively uses the battery's early cycling and / or measured parameter trends to adjust the battery's performance limits during actual use.

[0031] In an embodiment of the present invention, from the time the battery is first charged or used on an electric device (a stationary energy storage system or a consumer electronic product), the number of battery cycles and / or the trend of changes in health indicators are collected and compared with corresponding thresholds. Based on the comparison results, it is determined whether the battery is in the early running-in stage.

[0032] In a specific implementation, compared to other stages of the life cycle, when the battery is in the early application period, the potential degradation rate of its performance may be the highest. Therefore, when the power battery is first charged and used in electric devices such as electric vehicles, the method provided by the present invention is applied to set an early running-in stage in the early application period of the battery. In the early running-in stage, more conservative performance restriction measures are applied to the battery to avoid rapid and severe degradation of the battery in the early stage. At the same time, the battery that applies the running-in restriction mode in the early running-in stage has a lower rate and degree of degradation in general at other stages of the battery life cycle than the battery that does not have an early running-in stage.

[0033] In specific implementation, during the entire life cycle of lithium-ion batteries, a considerable part of the irreversible degradation occurs within the first multiple cycles of the battery. At this time, the battery begins to build the SEI layer, which is a passivation film covering the surface of the electrode. Its formation consumes part of the cyclable lithium, resulting in irreversible loss of early capacity. This phenomenon is particularly evident in the first few dozen cycles. For example, measured data show that during the first 50 to 100 cycles, the internal resistance (or impedance) of the battery often changes rapidly (sometimes even first decreases and then increases), reflecting that its electrochemical system is "activated" and stabilized, that is, in the early stages of the battery, the potential growth rate (possible growth rate) of the solid electrolyte interface and / or lithium dendrites is high.

[0034] At the same time, prolonged exposure to extreme conditions such as 100% or 0% SOC, high charge rates, and excessively high or low temperatures can put significant chemical stress on the battery, leading to thickening of the solid electrolyte interface layer and a rapid increase in internal resistance. Combined with the previously stated conclusions, the initial operating conditions of the battery have a significant impact on its performance baseline and subsequent service life. If the battery is subjected to excessive thermal or electrical stress during this critical "forming period," it may develop an abnormally thick SEI layer and lithium dendrite deposition, permanently compromising capacity and power capabilities at the start.

[0035] However, if the performance limitation measures of the early running-in stage provided by the present invention are set in the early application period of the battery, the battery is "gently managed" in its most vulnerable stage, the SEI layer is formed more evenly, the lithium dendrites do not grow excessively, and unnecessary chemical and mechanical stresses are avoided. The results shown in the experiment are that compared with the situation where 5% capacity may be lost in the first 100 cycles without running-in control, the system with a control strategy can reduce this loss. At the same time, based on the more uniform SEI layer formed, the capacity baseline of the battery in the mid-term and even late stages is significantly improved, that is, the battery with an early running-in stage has better performance in other stages of the battery life cycle. It can be further explained that after the early running-in stage is passed through the application of the running-in limitation mode, the thickness of the solid electrolyte interface of the battery or / and the number of lithium dendrites are lower than the corresponding standard value (the standard value corresponds to the SEI layer thickness and the number of lithium dendrites when the early running-in stage running-in limitation mode is not applied).

[0036] In an embodiment of the present invention, when the battery is in the early running-in stage, a running-in restriction mode is applied to the battery, and the running-in restriction mode includes the following restriction measures that are implemented simultaneously: (1) limiting the battery SOC range: during the charging process of the battery, the (maximum) available power after charging is controlled to be less than the available capacity of the battery; (2) limiting the battery charge and discharge rate: during the charging process of the battery, the (maximum) actual charging rate is controlled to be less than the maximum charging rate; (3) controlling the battery temperature: when the battery temperature is outside the protection temperature range, the (maximum) actual charging rate is controlled to be less than the maximum charging rate, or charging is stopped until the battery temperature reaches within the protection temperature range (the value includes both ends of the protection temperature range). After the battery ends the early running-in stage, the restriction measures can be released, and the nominal performance indicators (including charging rate, charging power and output power) can be used to control the charging and use of the battery.

[0037] In the embodiment of the present invention, limiting the battery charge and discharge rate includes: during use of the battery, controlling the (maximum) actual output power to be less than the maximum output power.

[0038] In specific implementations, the values ​​of the battery SOC range limit, charge and discharge rate limit, and temperature control and other related specific parameters may vary depending on factors such as user usage habits, cell type, or battery pack structure. The present invention provides the following preferred solutions: (1) Limiting the battery SOC range: During the battery charging process, the ratio of the available power after charging to the available capacity of the battery is controlled to be between 20% and 80%; (2) Limiting the battery charge and discharge rate: During the battery charging process, the actual charge rate is controlled to be less than or equal to 50% of the maximum charge rate; (3) Controlling the battery temperature: When the battery temperature is lower than 10 degrees Celsius or higher than 40 degrees Celsius, the actual charge rate is controlled to be less than or equal to 80% of the maximum charge rate, or charging is stopped until the battery temperature reaches between 10 degrees Celsius and 40 degrees Celsius.

[0039] In specific implementation, the method provided by the present invention is mainly applicable to electric vehicles (EV) and other battery-driven vehicles, such as plug-in hybrid vehicles, electric motorcycles, electric buses, etc., and can effectively improve the durability of their lithium-ion power battery packs. In addition to the vehicle field, the present invention is also applicable to large lithium-ion batteries used in stationary energy storage systems or consumer electronic products, and is applicable to the first time a new battery module is activated. When household energy storage equipment is first deployed, a "running-in mode" can be executed to maximize its subsequent calendar life; renewable energy storage systems, grid regulation devices, etc. can all use the present invention to reduce early degradation; any industry scenario involving the deployment of high-capacity new lithium batteries can apply the present invention, thereby achieving early optimization and conditioning, improving battery reliability and full life cycle benefits.

[0040] In specific implementations, the number of battery cycles can adopt the general definition method of the battery industry. The increase in the number of cycles depends on whether the total amount of electricity used by the battery reaches 100% of its available capacity. For example, no matter how many times the battery undergoes partial charging, as long as the cumulative amount of electricity used reaches the available capacity once, it is recorded as an additional cycle.

[0041] In an embodiment of the present invention, the corresponding threshold value of the number of cycles generally ranges from 50 to 100 (a boundary value can be obtained); if the number of cycles is less than or equal to the corresponding threshold value, it is determined that the battery is in the early running-in stage.

[0042] In a specific implementation, the corresponding threshold value of the number of cycles ranges from 50 to 100, that is, when the number of battery cycles is a value between 50 and 100, it can be considered that the battery is in the early running-in stage (depending on the value of the threshold).

[0043] In an embodiment of the present invention, the health indicator change trend includes at least one of the following: internal resistance change rate, impedance change rate, capacity retention rate change rate and coulombic efficiency change rate; if the health indicator change trend is greater than the corresponding threshold, it is determined that the battery is in the early running-in stage.

[0044] In specific implementations, the changing trends of the battery's health indicators represent the changing trends of the battery's internal chemical state and performance indicators. Among them, the capacity retention rate refers to the ratio of the remaining capacity of the battery to the initial capacity after use or storage, and is usually calculated using the following formula: capacity retention rate = (current capacity / initial capacity); Coulombic efficiency refers to the ratio of the discharge capacity to the charging capacity of the battery in a complete charge and discharge cycle, and is usually calculated using the following formula: Coulombic efficiency = (discharge capacity / charging capacity). During the use of the battery, if the value of the above-mentioned rate of change is high and greater than the corresponding threshold (which can be set according to the actual application scenario), it indicates that the internal chemical state and performance indicators of the battery are in a relatively obvious change process, and it can be determined that it is in the early running-in stage. If the value of the above-mentioned rate of change is low and is less than or equal to the corresponding threshold, it indicates that the changes in the internal chemical state and performance indicators of the battery are slowing down, and it can be determined that the early running-in stage is over.

[0045] In a specific implementation, the calculation method of the change rate parameters such as the internal resistance change rate can be, for example, the change of the internal resistance value relative to time, or the change of the internal resistance value relative to the number of battery cycles. The same applies to the change rates such as the impedance change rate, the capacity retention rate, and the coulombic efficiency.

[0046] In a specific implementation, when the number of battery cycles and the changing trends of health indicators are collected at the same time, the battery can be determined to be in the early running-in stage only when both meet the criteria for being in the early running-in stage, or the battery can be determined to be in the early running-in stage when either one meets the criteria for being in the early running-in stage.

[0047] In specific implementation, the running-in restriction mode is applied to the battery in the early running-in stage, and three restriction measures are applied simultaneously: limiting the battery SOC (State Of Charge, SOC) range, limiting the battery charge and discharge rate, and controlling the battery temperature.

[0048] In specific implementation, the battery SOC range is limited to between 20% and 80% to ensure that the battery is not charged too high (such as not exceeding 80% SOC) or discharged too low (such as not less than 20% SOC). This can be achieved by adjusting the charge cut-off voltage and discharge cut-off threshold within the battery management system. In actual operation, even if the user sets the charge to 100%, the battery management system will gradually slow down and stop charging at about 80%. When the vehicle approaches 20% SOC, a pop-up warning may appear or the vehicle may automatically enter energy-saving mode to avoid deep discharge. Maintaining the intermediate SOC range helps avoid excessive SEI growth and lithium dendrite formation induced by extreme conditions.

[0049] In practice, the battery management system limits the maximum current during the charging and discharging process to prevent high-rate charging and discharging. Regarding charging, high-power DC fast charging is prohibited. For example, a battery that originally supported a 2C to 3C charging rate is limited to 0.5C or 1C. The charging station output can be controlled through the charging protocol, or the current can be actively reduced internally. Regarding discharging, the maximum output power of the vehicle is limited. For example, during the early running-in phase, acceleration or top speed performance is reduced. Current limiting can significantly reduce the risk of lithium dendrites, especially during fast charging at low temperatures, and alleviate the mechanical stress on the electrodes under high current surges.

[0050] In specific implementations, the battery management system works in conjunction with the vehicle's thermal management system (pumps, fans, heaters) to achieve preheating or delayed operation. For example, if the battery temperature is below 10 degrees Celsius, the system delays charging and restarts charging after heating to a suitable temperature (10 degrees Celsius and above), or limits the charging rate while heating the battery. The lower the temperature, the higher the restriction on the charging rate. If the battery temperature is above 40 degrees Celsius, the system similarly delays charging and restarts charging after cooling to a suitable temperature (40 degrees Celsius and below), or limits the charging rate while cooling the battery. The higher the temperature, the higher the restriction on the charging rate.

[0051] In an embodiment of the present invention, it also includes: when applying a running-in restriction mode to a battery, as the number of battery cycles increases or the trend of changes in health indicators decreases, the restriction measures on the battery are gradually relaxed until the end of the early running-in stage, and the nominal performance indicators are applied to control the charging and use of the battery.

[0052] In a specific implementation, the present invention also provides a solution for a progressive exit mechanism in the early running-in stage, that is, as the early running-in stage approaches the end, the degree of restriction of the running-in restriction mode can be lowered, and charging and use are closer to the nominal performance indicators of the battery.

[0053] In the embodiment of the present invention, the degree of relaxation of the restriction measures on the battery is positively correlated with the increased number of cycles of the battery, or negatively correlated with the trend of changes in health indicators.

[0054] In an embodiment of the present invention, the gradually relaxing restrictions on the battery include: controlling the available power after charging to gradually relax until it can reach the available capacity of the battery; controlling the actual charging rate to gradually relax until it can reach the maximum charging rate; controlling the actual output power to gradually relax until it can reach the maximum output power; and when the battery temperature is outside the protection temperature range, controlling the actual charging rate to gradually relax until it can reach the maximum charging rate. Specifically, controlling the ratio of the available power after charging to the available capacity of the battery to gradually relax from 20% to 80% to 0% to 100%; controlling the actual charging rate to gradually relax from less than or equal to 50% of the maximum charging rate to 100%; when the battery temperature is outside the protection temperature range (preferably 10 degrees Celsius to 40 degrees Celsius), taking into account the gap between the actual temperature and the protection temperature range (the smaller the gap, the higher the degree of relaxation), controlling the actual charging rate to gradually relax from less than or equal to 80% of the maximum charging rate to 100%.

[0055] In a specific implementation, taking the number of cycles as an example, the restriction measures on the battery can be smoothly released as the number of cycles increases. For example, the following formula is used for calculation:

[0056] SOC max (n) = SOC 初始 +(SOC 最终 -SOC 初始 )n / N,

[0057] Among them, SOC max (n) represents the current maximum SOC limit range at cycle number n, SOC 初始 and SOC 最终 They represent the initial and final values ​​of the SOC limit range (usually 20% to 80%, and 0% to 100%), respectively, and n and N represent the current cycle number and the total number of cycles required to end the early running-in stage (i.e., the corresponding thresholds of the cycle number), respectively.

[0058] In a specific implementation, also taking the number of cycles as an example, the restrictions on the battery can be relaxed exponentially as the number of cycles increases. For example, the following formula is used for calculation:

[0059] SOC max (n) = SOC 初始 +(SOC 最终 -SOC 初始 )(1-e -αn ),

[0060] Here, α represents the coefficient that controls the speed of change.

[0061] In specific implementation, the above two methods can also be used to relax the restrictions on battery charge and discharge rates.

[0062] In specific implementations, when using the health indicator trend as an evaluation metric to determine the degree of relaxation of battery restrictions, the aforementioned smoothing and exponential methods can also be used to determine the degree of relaxation of battery restrictions. For example, when using the smoothing method, the degree of reduction in the health indicator trend corresponds to the degree of relaxation of battery restrictions. When using the exponential method, the lower the health indicator trend, the higher the degree of relaxation of battery restrictions. When controlling battery temperature, the gap between the actual temperature and the protection temperature range can also be considered. The smaller the gap, the higher the degree of relaxation.

[0063] In specific implementation, other gradual exit mechanisms can also be set up based on the battery chemical system and actual application scenarios.

[0064] In a specific implementation, after the battery ends the early running-in stage, the collection of the number of cycles and / or health indicator change trends for determining whether it is in the early running-in stage may be stopped.

[0065] The present invention has broad industrial applicability in the fields of battery technology and power management technology, ensuring that the battery is in an optimized operating state from the beginning of service and maintains stable performance throughout its life cycle.

[0066] The present invention also provides a system for mitigating early battery degradation, comprising: a parameter collection and early running-in stage confirmation unit, a running-in restriction application unit, and a user interaction unit, wherein:

[0067] The parameter collection and early running-in stage confirmation unit is used to collect the number of battery cycles and / or health indicator change trends since the battery is first charged or used on the electric device, and compare them with corresponding thresholds, and determine whether the battery is in the early running-in stage based on the comparison results; after the battery completes the early running-in stage, the nominal performance indicators are used to control the charging and use of the battery;

[0068] The run-in restriction application unit is configured to apply a run-in restriction mode to the battery when the battery is in the early run-in stage. The run-in restriction mode includes the following restriction measures that are implemented simultaneously:

[0069] (1) Limiting the battery SOC range: During the charging process, the available power after charging is controlled to be less than the available capacity of the battery;

[0070] (2) Limiting the battery charge and discharge rate: During the battery charging process, the actual charge rate is controlled to be less than the maximum charge rate;

[0071] (3) Control battery temperature: When the battery temperature is outside the protection temperature range, control the actual charging rate to be less than the maximum charging rate, or stop charging until the battery temperature reaches the protection temperature range;

[0072] The user interaction unit is used to prompt the user that the battery is currently applying a running-in restriction mode through a user interaction interface when the battery is in the early running-in stage.

[0073] In a specific implementation, the method, steps or functions executed by the execution unit of the system for mitigating premature battery degradation provided by the present invention can refer to the method for mitigating premature battery degradation provided by the present invention.

[0074] In specific implementation, the system for mitigating premature battery degradation can be deployed entirely on the electric device or partially on the cloud.

[0075] In the cloud-controlled scenario, the vehicle uploads data (such as the number of completed cycles, internal resistance, capacity, etc.); the cloud determines whether running-in control should still be performed; risks are analyzed based on the overall data set (such as fleet statistics and model comparison); the cloud sends specific limit parameters (such as SOC upper limit X%, charging current YA); the vehicle receives and executes them until the next cloud update instruction.

[0076] The function of the user interaction unit (App) is to interact with the user, and the core control is still performed by the battery management system. The App can set the SOC upper limit to 80% by default and explain the reason for the adjustment. When the user attempts to force cancellation, a life risk warning can be issued. The App can also suggest that the user preheat the battery before cold weather. The progress and suggestions are prompted after each cycle, such as "The 10th cycle has been completed, please avoid sudden acceleration."

[0077] The present invention also provides a battery management system, comprising a memory and a processor, wherein the memory stores a computer program executable by the processor. When the computer program is executed by the processor, any one of the methods for mitigating premature battery degradation provided by the present invention is executed. The battery management system is configured to execute the method for mitigating premature battery degradation in a local electronic device or a cloud server.

[0078] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program implements the steps of any one of the methods for alleviating premature battery degradation provided by the present invention. The processor is configured in a local electronic device or a cloud server.

Claims

1. A method for alleviating premature battery degradation, characterized in that: include: Collect the number of battery cycles and / or health indicator change trends from the time the battery is first charged or used on the electric device, compare them with corresponding thresholds, and determine whether the battery is in the early running-in stage based on the comparison results; When the battery is in the early stages of running-in, a running-in restriction mode is applied to the battery. The running-in restriction mode includes the following restriction measures that are implemented simultaneously: (1) Limiting the battery SOC range: During the charging process, the available power after charging is controlled to be less than the available capacity of the battery; (2) Limiting the battery charge and discharge rate: During the battery charging process, the actual charge rate is controlled to be less than the maximum charge rate; (3) Control battery temperature: When the battery temperature is outside the protection temperature range, control the actual charging rate to be less than the maximum charging rate, or stop charging until the battery temperature reaches the protection temperature range; After the battery has completed the early run-in phase, the nominal performance indicators are applied to control the charging and use of the battery.

2. The method for alleviating premature battery degradation according to claim 1, wherein: If the number of cycles is less than or equal to the corresponding threshold, it is determined that the battery is in the early running-in stage.

3. The method for alleviating premature battery degradation according to claim 1, wherein: The health indicator change trend includes at least one of the following: internal resistance change rate, impedance change rate, capacity retention rate change rate and coulombic efficiency change rate; if the health indicator change trend is greater than the corresponding threshold, it is determined that the battery is in the early running-in stage.

4. The method for alleviating premature battery degradation according to claim 1, wherein: The limiting the battery charge and discharge rate includes: during the use of the battery, controlling the actual output power to be less than the maximum output power.

5. The method for alleviating premature battery degradation according to claim 1, wherein: Also includes: When applying the run-in restriction mode to the battery, as the number of battery cycles increases or the trend of changes in health indicators decreases, the restrictions on the battery are gradually relaxed until the end of the early run-in stage, and the nominal performance indicators are applied to control the charging and use of the battery.

6. The method for alleviating premature battery degradation according to claim 5, characterized in that: The degree of relaxation of restrictions on batteries is positively correlated with the increased number of battery cycles, or negatively correlated with the trend of changes in health indicators.

7. The method for alleviating premature battery degradation according to claim 5, characterized in that: The gradual relaxation of restrictions on the battery includes: gradually controlling the available power after charging to reach the available capacity of the battery; and gradually controlling the actual charging rate to reach the maximum charging rate.

8. A system for mitigating premature battery degradation, characterized in that: include: Parameter collection and early run-in phase confirmation unit, run-in limit application unit, and user interaction unit, including: The parameter collection and early running-in stage confirmation unit is used to collect the number of battery cycles and / or health indicator change trends since the battery is first charged or used on the electric device, and compare them with corresponding thresholds, and determine whether the battery is in the early running-in stage based on the comparison results; after the battery completes the early running-in stage, the nominal performance indicators are used to control the charging and use of the battery; The run-in restriction application unit is configured to apply a run-in restriction mode to the battery when the battery is in the early run-in stage. The run-in restriction mode includes the following restriction measures that are implemented simultaneously: (1) Limiting the battery SOC range: During the charging process, the available power after charging is controlled to be less than the available capacity of the battery; (2) Limiting the battery charge and discharge rate: During the battery charging process, the actual charge rate is controlled to be less than the maximum charge rate; (3) Control battery temperature: When the battery temperature is outside the protection temperature range, control the actual charging rate to be less than the maximum charging rate, or stop charging until the battery temperature reaches the protection temperature range; The user interaction unit is used to prompt the user that the battery is currently applying a running-in restriction mode through a user interaction interface when the battery is in the early running-in stage.

9. A battery management system, characterized in that: The invention comprises a memory and a processor, wherein a computer program executable by the processor is stored in the memory, and when the computer program is executed by the processor, the method for mitigating premature battery degradation as described in any one of claims 1 to 7 is executed, and the battery management system is configured to execute the method for mitigating premature battery degradation in a local electronic device or a cloud server.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for mitigating premature battery degradation according to any one of claims 1 to 7 are implemented, and the processor is configured in a local electronic device or a cloud server.

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