A method, device, equipment and medium for overcharge protection of a power battery

Abstract

The application discloses a kind of overcharge prevention methods, devices, equipment and medium of power battery, comprising: after power battery completes charging process and stops charging, in the case where power battery is not disconnected with charging device, whether power battery enters charging mode again is continuously monitored, if power battery enters charging mode again is monitored, then the actual charge amount stored after power battery is recharged is monitored;If actual charge amount is greater than or equal to overcharge threshold, control the charging loop of power battery to disconnect, and then timely intervene power battery overcharge phenomenon occurs.The application can disconnect the charging loop before causing greater negative impact on the life of power battery, to a certain extent, reduce the probability that power battery continues to charge after being fully charged, i.e. Reduce the probability that power battery appears overcharge phenomenon, so as to greatly reduce the probability that power battery shortens life due to overcharge, prolong the service life of power battery.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a method, apparatus, device, and medium for preventing overcharging of power batteries. Background Technology

[0002] New energy vehicles typically use power batteries as their energy source. Even after being fully charged, the power battery may still be in a charging state, leading to the possibility of overcharging.

[0003] However, overcharging a power battery can shorten its lifespan. Therefore, reducing the likelihood of overcharging is a pressing issue that needs to be addressed. Summary of the Invention

[0004] This application provides a method, device, equipment, and medium for preventing overcharging of power batteries, which solves the technical problem that power batteries are prone to overcharging after charging is completed in the prior art. It achieves the technical effect of reducing the probability of overcharging after charging is completed and extending the service life of power batteries.

[0005] Firstly, this application provides a method for preventing overcharging of a power battery, the method comprising:

[0006] After the power battery completes the charging process and stops charging, check whether the connection between the power battery and the charging equipment is disconnected.

[0007] Monitor whether the power battery re-enters charging mode while the connection between the power battery and the charging equipment remains intact.

[0008] Monitor the actual charge amount stored in the power battery after it re-enters the charging mode.

[0009] Determine whether the actual charge amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charge amount of the power battery.

[0010] If the actual charge amount is greater than or equal to the overcharge threshold, the charging circuit of the power battery will be disconnected.

[0011] Furthermore, the actual charge amount stored in the power battery after it re-enters the charging mode is monitored, including:

[0012] Obtain the normal full charge stored in the power battery when the charging process is completed and charging stops;

[0013] Monitor the abnormal charge amount stored in the power battery after the power battery re-enters the charging mode.

[0014] Based on normal full charge and abnormal charge amount, determine the actual charge amount stored in the power battery after it re-enters the charging mode.

[0015] Furthermore, monitoring the abnormal charge level stored in the power battery after it re-enters the charging mode includes:

[0016] Based on the real-time charging temperature, real-time current, real-time voltage, and charging time after the power battery re-enters the charging mode, the abnormal charge amount stored in the power battery after re-entering the charging mode is determined.

[0017] Furthermore, based on the real-time charging temperature, real-time current, real-time voltage, and charging duration after the power battery re-enters the charging mode, the abnormal charge amount stored in the power battery after re-entering the charging mode is determined, including:

[0018] Based on the real-time charging temperature, real-time current and charging time after the power battery re-enters the charging mode, the abnormal capacity value stored in the power battery after re-entering the charging mode is determined.

[0019] Based on the real-time charging temperature, real-time voltage, and abnormal capacity value after the power battery re-enters the charging mode, the abnormal charge value stored in the power battery after re-entering the charging mode is determined; the abnormal charge amount includes at least one parameter value among the abnormal capacity value and the abnormal charge value.

[0020] Further, determining whether the actual charge amount is greater than or equal to the overcharge threshold includes:

[0021] Based on the current charging temperature of the power battery during the recharging process corresponding to the actual charging amount, determine the overcharge threshold of the power battery at the current charging temperature.

[0022] Determine whether the actual charge amount is greater than or equal to the overcharge threshold corresponding to the current charging temperature.

[0023] Furthermore, controlling the disconnection of the charging circuit of the power battery includes:

[0024] The relay controlling the high-voltage circuit containing the power battery is disconnected.

[0025] Furthermore, after disconnecting the charging circuit of the power battery, the method also includes:

[0026] The power battery is prohibited from re-entering charging mode if the current connection between the power battery and the charging equipment is not disconnected.

[0027] Secondly, this application provides an overcharge protection device for a power battery, the device comprising:

[0028] The connection detection module is used to detect whether the connection between the power battery and the charging equipment is disconnected after the power battery has completed the charging process and stopped charging.

[0029] The recharge monitoring module is used to monitor whether the power battery has re-entered the charging mode when the connection between the power battery and the charging equipment is not disconnected.

[0030] The charge amount monitoring module is used to monitor the actual charge amount stored in the power battery after the power battery re-enters the charging mode.

[0031] The judgment module is used to determine whether the actual charge amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charge amount of the power battery.

[0032] The control module is used to disconnect the charging circuit of the power battery if the actual charge amount is greater than or equal to the overcharge threshold.

[0033] Furthermore, the charge volume monitoring module includes:

[0034] The normal full charge acquisition submodule is used to acquire the normal full charge stored in the power battery when the charging process is completed and charging stops.

[0035] The abnormal charge amount monitoring submodule is used to monitor the abnormal charge amount stored in the power battery after the power battery re-enters the charging mode.

[0036] The charge amount monitoring submodule is used to determine the actual charge amount stored in the power battery after it re-enters the charging mode, based on normal full charge and abnormal charge amount.

[0037] Furthermore, the abnormal filling volume monitoring submodule is specifically used for:

[0038] Based on the real-time charging temperature, real-time current, real-time voltage, and charging time after the power battery re-enters the charging mode, the abnormal charge amount stored in the power battery after re-entering the charging mode is determined.

[0039] Furthermore, the abnormal filling volume monitoring submodule is specifically used for:

[0040] Based on the real-time charging temperature, real-time current and charging time after the power battery re-enters the charging mode, the abnormal capacity value stored in the power battery after re-entering the charging mode is determined.

[0041] Based on the real-time charging temperature, real-time voltage, and actual capacity value of the power battery after it re-enters the charging mode, the abnormal charge value stored in the power battery after re-entering the charging mode is determined; the abnormal charge amount includes at least one parameter value among the abnormal capacity value and the abnormal charge value.

[0042] Furthermore, the judgment module includes:

[0043] The overcharge threshold determination submodule is used to determine the overcharge threshold corresponding to the power battery at the current charging temperature based on the current charging temperature of the power battery during the recharging process corresponding to the actual charging amount.

[0044] The judgment submodule is used to determine whether the actual charging amount is greater than or equal to the overcharge threshold corresponding to the current charging temperature.

[0045] Furthermore, the control module is specifically used for:

[0046] The relay controlling the high-voltage circuit containing the power battery is disconnected.

[0047] Furthermore, the device also includes a blocking module for:

[0048] After the charging circuit of the power battery is disconnected, the power battery is prohibited from re-entering the charging mode if the current connection between the power battery and the charging equipment is not disconnected.

[0049] Thirdly, this application provides an electronic device, comprising:

[0050] processor;

[0051] Memory used to store processor-executable instructions;

[0052] The processor is configured to execute a method for preventing overcharging of a power battery as provided in the first aspect.

[0053] Fourthly, this application provides a non-transitory computer-readable storage medium, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform an overcharge prevention method for a power battery as provided in the first aspect.

[0054] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0055] In this embodiment, after the power battery completes the charging process and stops charging, it detects whether the connection between the power battery and the charging equipment is disconnected. If the connection between the power battery and the charging equipment is not disconnected, it continuously monitors whether the power battery re-enters the charging mode. If the power battery re-enters the charging mode, it monitors the actual charge amount stored after recharging. If the actual charge amount is greater than or equal to the overcharge threshold, it controls the power battery's charging circuit to disconnect, thereby intervening in time to prevent the power battery from overcharging. The overcharge threshold is a higher overcharge threshold than the rated charge amount of the power battery, used to determine whether the power battery is about to reach an overcharged state or has already reached an overcharged state. After determining that the power battery is about to reach or has already reached an overcharged state, it controls the power battery's charging circuit to disconnect.

[0056] As can be seen, in this embodiment, after the power battery is fully charged and charging is stopped, the connection between the power battery and the charging equipment is continuously monitored. If the connection remains intact, the system monitors whether the power battery has entered a recharging state. If so, based on an overcharge threshold higher than the power battery's rated charge capacity, it determines whether the power battery is about to reach or has already reached an overcharge state during the recharging process. This means determining whether continuing to charge the power battery would negatively impact its lifespan. Once it is determined that continuing to charge the power battery would damage it, the charging circuit is disconnected before a significant negative impact on the battery's lifespan is achieved. This reduces the probability of the power battery continuing to charge after being fully charged, thus reducing the likelihood of overcharging and significantly decreasing the chance of a shortened lifespan due to overcharging, thereby extending the power battery's service life. Furthermore, stopping charging after a full charge saves energy; disconnecting the charging circuit after a full charge also improves the safety of the power battery and the vehicle. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 A flowchart illustrating a method for preventing overcharging of a power battery provided in this application;

[0059] Figure 2 A schematic diagram of the structure of an overcharge protection device for a power battery provided in this application;

[0060] Figure 3 This is a schematic diagram of the structure of an electronic device provided in this application. Detailed Implementation

[0061] This application provides a method for preventing overcharging of power batteries, which solves the technical problem in the prior art that power batteries are prone to overcharging after charging is completed.

[0062] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows:

[0063] An overcharge prevention method for a power battery includes: after the power battery completes the charging process and stops charging, detecting whether the connection between the power battery and the charging equipment is disconnected; if the connection between the power battery and the charging equipment is not disconnected, monitoring whether the power battery re-enters the charging mode; monitoring the actual charge amount stored in the power battery after it re-enters the charging mode; determining whether the actual charge amount is greater than or equal to an overcharge threshold; if the overcharge threshold is greater than or equal to the rated charge amount of the power battery; and if the actual charge amount is greater than or equal to the overcharge threshold, controlling the charging circuit of the power battery to disconnect.

[0064] In this embodiment, after the power battery completes the charging process and stops charging, it detects whether the connection between the power battery and the charging equipment is disconnected. If the connection between the power battery and the charging equipment is not disconnected, it continuously monitors whether the power battery re-enters the charging mode. If the power battery re-enters the charging mode, it monitors the actual charge amount stored after recharging. If the actual charge amount is greater than or equal to the overcharge threshold, it controls the power battery's charging circuit to disconnect, thereby intervening in time to prevent the power battery from overcharging. The overcharge threshold is a higher overcharge threshold than the rated charge amount of the power battery, used to determine whether the power battery is about to reach an overcharged state or has already reached an overcharged state. After determining that the power battery is about to reach or has already reached an overcharged state, it controls the power battery's charging circuit to disconnect.

[0065] As can be seen, in this embodiment, after the power battery is fully charged and charging is stopped, the connection between the power battery and the charging equipment is continuously monitored. If the connection remains intact, the system monitors whether the power battery has entered a recharging state. If so, based on an overcharge threshold higher than the power battery's rated charge capacity, it determines whether the power battery is about to reach or has already reached an overcharge state during the recharging process. This means determining whether continuing to charge the power battery would negatively impact its lifespan. Once it is determined that continuing to charge the power battery would damage it, the charging circuit is disconnected before a significant negative impact on the battery's lifespan is achieved. This reduces the probability of the power battery continuing to charge after being fully charged, thus reducing the likelihood of overcharging and significantly decreasing the chance of a shortened lifespan due to overcharging, thereby extending the power battery's service life. Furthermore, stopping charging after a full charge saves energy; disconnecting the charging circuit after a full charge also improves the safety of the power battery and the vehicle.

[0066] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0067] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0068] This application provides, as follows: Figure 1 The present invention discloses a method for preventing overcharging of a power battery, comprising steps S11-S15. The charging method provided in this embodiment can be applied to a vehicle controller or to a power battery's battery management system (BMS), and this embodiment does not impose any limitations thereon. The charging method provided in this embodiment is applicable to both wired and wireless charging. Wired charging may include plug-in charging.

[0069] Step S11: After the power battery completes the charging process and stops charging, check whether the connection between the power battery and the charging equipment is disconnected.

[0070] Step S12: If the connection between the power battery and the charging equipment is not disconnected, monitor whether the power battery re-enters the charging mode.

[0071] Step S13: Monitor the actual charge amount stored in the power battery after it re-enters the charging mode.

[0072] Step S14: Determine whether the actual charge amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charge amount of the power battery.

[0073] Step S15: If the actual charge amount is greater than or equal to the overcharge threshold, control the power battery charging circuit to disconnect.

[0074] Regarding step S11, after the power battery completes the charging process and stops charging, it is detected whether the connection between the power battery and the charging equipment is disconnected.

[0075] The charging process of a power battery is essentially the process of transferring external energy to the power battery for energy storage or adding energy to the battery. The energy stored in a power battery can be expressed through SOC (State of Charge, which refers to the proportion of usable capacity to rated capacity), ampere-hour integral capacity (simply put into the battery), and charge. SOC is usually expressed as a percentage, capacity is measured in Ah (ampere-hours), and charge is measured in Wh (watt-hours). SOC is related to ampere-hour integral capacity, and the two can be converted to each other.

[0076] Normally, during the charging process, the energy stored in a power battery increases. Taking State of Charge (SOC) as an example, the SOC of the power battery will continuously increase during charging. When the SOC reaches 100%, the power battery is considered to have completed the charging process. After the power battery has completed the charging process, charging usually stops.

[0077] If the power battery is disconnected from the charging equipment in a timely manner after the charging process is completed and charging stops, overcharging will not occur. For example, if the power battery is charged using a charging gun, and the charging gun is promptly disconnected after charging is complete, the power battery will not be further charged by the charging gun, thus preventing overcharging.

[0078] However, if the battery is not disconnected from the charging equipment after charging is complete and stops, overcharging may occur. For example, if the battery is charged using a charging gun, and the charging gun stops charging after completion, but is not disconnected promptly, it may restart charging after a period of time, or it may trickle charge the battery. The more repeated the charging or the longer the charging time, the greater the likelihood of overcharging.

[0079] In this embodiment, to determine whether the power battery is likely to be overcharged, based on step S11, after the power battery completes the charging process and stops charging, it is detected whether the connection between the power battery and the charging device is disconnected. Whether the power battery is disconnected from the charging device can be determined by relying on heartbeat signals, charging gun connection signals, etc., and this embodiment does not limit this.

[0080] If it is detected that the power battery and the charging equipment have been disconnected, it means that there is no possibility of overcharging of the power battery, and therefore there is no need to execute step S12 and its subsequent steps.

[0081] If it is detected that the power battery and the charging equipment are not disconnected, it means that there is a possibility that the power battery is overcharged, and step S12 needs to be executed.

[0082] Regarding step S12, if the connection between the power battery and the charging device is not disconnected, monitor whether the power battery re-enters the charging mode.

[0083] The re-entry of the power battery into charging mode refers to the re-starting of charging after the power battery has reached a fully charged state and stopped charging in step S11. This can also be called recharging.

[0084] For example, if the power battery reaches a fully charged state and stops charging at 13:45 on the same day, the power battery is not disconnected from the charging equipment. After waiting for 20 minutes, that is, at 14:05 on the same day, the power battery starts charging again. Therefore, it is considered that the power battery has entered charging mode again after 14:05.

[0085] For monitoring whether the power battery has re-entered the charging mode, relevant technologies can be referenced, and no restrictions are imposed here.

[0086] If the power battery does not re-enter the charging mode, then step S13 and its subsequent steps do not need to be executed. If the power battery re-enters the charging mode, then step S13 and its subsequent steps continue to be executed.

[0087] After a power battery has reached a fully charged state and charging has stopped, the number of times it "re-enters charging mode" may be one or multiple. In actual operation, step S13 can be triggered at the first, second, third, and fourth occurrences of "power battery re-entering charging mode". However, it is preferable to trigger step S13 at the first occurrence of "power battery re-entering charging mode", which can reduce the possibility of overcharging of the power battery. That is, step S13 is executed when the power battery first recharges.

[0088] Step S13: Monitor the actual charge amount stored in the power battery after it re-enters the charging mode.

[0089] The actual charge amount stored in the power battery can be obtained using relevant testing equipment, or it can be determined according to the following steps S131-S133.

[0090] Step S131: Obtain the normal full charge stored in the power battery when the charging process is completed and charging stops.

[0091] Normal full charge refers to the amount of charge stored in the power battery when the charging process is completed and charging stops. Normal full charge can be collected using relevant testing equipment or determined based on a preset threshold for when the power battery is considered to have "completed the charging process".

[0092] Step S132: Monitor the abnormal charge amount stored in the power battery after the power battery re-enters the charging mode.

[0093] Abnormal charge amount refers to the additional charge amount added to the power battery after recharging. This can be determined using relevant testing equipment or by the following method:

[0094] Based on the real-time charging temperature, real-time current, real-time voltage, and charging time after the power battery re-enters the charging mode, the abnormal charge amount stored in the power battery after re-entering the charging mode is determined.

[0095] The charging efficiency of a power battery varies at different temperatures. This embodiment monitors the real-time charging temperature of the power battery after float charging, as well as the corresponding real-time current and voltage. By comprehensively considering the impact of charging temperature, current, and voltage on the recharging of the power battery, the abnormal charge amount after recharging can be determined more accurately. The abnormal charge amount includes at least one parameter value among abnormal capacity value and abnormal charge value.

[0096] During the recharging process of the power battery, the temperature, current, and voltage of the power battery are monitored using detection equipment. This equipment can be sensors, such as temperature sensors, current sensors, and voltage sensors. In practice, the temperature, current, and voltage of the power battery are monitored at the same frequency to ensure a one-to-one correspondence between the measurements. The frequency of temperature, current, and voltage monitoring can be set according to actual conditions; for example, monitoring temperature, current, and voltage every 10 seconds. The charging time of the power battery is determined based on the actual charging time.

[0097] When the abnormal charge amount is equal to the capacity, the abnormal capacity value stored in the power battery after re-entering the charging mode can be determined based on the real-time charging temperature, real-time current, and charging time. This involves integrating different currents and times within the charging time, combined with the real-time charging temperature, the corresponding real-time current, and the charging time, to determine the current abnormal capacity value stored in the power battery.

[0098] When the abnormal charge amount is electrical quantity, the abnormal electrical quantity stored in the power battery after re-entering the charging mode can be determined based on the real-time charging temperature, real-time voltage, and abnormal capacity value (i.e., the abnormal capacity value determined based on the real-time current and charging time mentioned above). In other words, by combining the real-time charging temperature, the corresponding real-time voltage, and the charging time, and integrating different currents and voltages with different times within the charging time, the current abnormal electrical quantity stored in the power battery can be determined.

[0099] For example, as shown in Table 1, the process parameters during the recharging of the power battery (including charging time, temperature, current, voltage, charge, capacity, etc.) are presented. It should be noted that in actual operation, the process parameters during the recharging of the power battery can be presented in tabular form or in curve form. This embodiment will only use Table 1 as an example for subsequent explanation.

[0100] As shown in Table 1, the recharging process of the power battery is divided into four stages based on the temperature range, with the charging time increasing. During the recharging process, the temperature, current, and voltage all change.

[0101] During the recharging process of a power battery, the charging time, current, and voltage are integrated to obtain the current abnormal capacity or abnormal charge level of the power battery. For example, in the first stage, the abnormal capacity of the power battery is Q1, and the abnormal charge level is E1. In the second stage, the abnormal capacity is Q2, and the abnormal charge level is E2. It is important to note that Q2 is the capacity added to the power battery during the second stage, not the capacity at the end of the second stage; that is, Q2 does not include Q1. Similarly, E2 is the amount of charge added to the power battery during the second stage, not the capacity at the end of the second stage; that is, E2 does not include E1.

[0102] Table 1

[0103]

[0104] In other words, if the recharge of the power battery only includes the four stages shown in Table 1, then the abnormal capacity value (total value) of the power battery after recharging is the sum of Q1, Q2, Q3, and Q4, and the abnormal charge value (total value) of the power battery after recharging is the sum of E1, E2, E3, and E4.

[0105] Step S133: Based on the normal full charge and abnormal charge amount, determine the actual charge amount stored in the power battery after it re-enters the charging mode.

[0106] The sum of the normal full charge and the abnormal charge amount is the actual charge amount currently stored in the power battery. For example, if the normal full charge is Q0, then according to the data in Table 1, the actual charge amount corresponding to the power battery is the sum of Q0, Q1, Q2, Q3, and Q4. As another example, if the normal full charge is E0, then according to the data in Table 1, the actual charge amount corresponding to the power battery is the sum of E0, E1, E2, E3, and E4.

[0107] Regarding step S14, determine whether the actual charge amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charge amount of the power battery.

[0108] The overcharge threshold is a parameter value that is greater than or equal to the rated charge capacity of a power battery. The overcharge threshold refers to the critical value at which a power battery reaches an overcharged state. When the actual charge capacity is greater than or equal to the overcharge threshold, it indicates that the power battery is about to be overcharged or has already been overcharged. When the actual charge capacity is less than the overcharge threshold, it indicates that the power battery is not overcharged.

[0109] The maximum charge capacity of a power battery varies depending on the temperature at which it is fully charged. Similarly, the charge capacity required to reach overcharge conditions also differs at different temperatures. In other words, the overcharge threshold for a power battery varies at different recharge temperatures. For example, if the rated charge capacity of a power battery is Q... 额定 When the recharge temperature is 50℃, the corresponding overcharge threshold is 1.1Q. 额定 When the recharge temperature is 60℃, the corresponding overcharge threshold is 1.08Q. 额定 .

[0110] Therefore, when determining whether the actual charge amount is greater than or equal to the overcharge threshold, it is also necessary to determine the overcharge threshold corresponding to the power battery at the current charging temperature during the recharging process, based on the current charging temperature of the power battery corresponding to the actual charge amount, and then determine whether the actual charge amount is greater than or equal to the overcharge threshold corresponding to the current charging temperature.

[0111] In addition, the overcharge threshold corresponding to a certain recharge temperature can be determined based on a preset coefficient and the rated charge amount of the power battery.

[0112] In practice, the product of the preset coefficient and the rated charge amount can be used as the overcharge threshold. The type of actual charge amount corresponds to the type of overcharge threshold. The preset coefficient can be a value greater than 1. It should be noted that the preset coefficient has an upper limit, determined based on relevant battery charging data, typically 1.1.

[0113] For example, when the rated capacity of the power battery is Q 额定 When the overcharge threshold is greater than or equal to Q, then the overcharge threshold is greater than or equal to Q. 额定 The capacity value, for example, an overcharge threshold of 1.1Q. 额定 When the rated capacity of the power battery is E 额定 When the overcharge threshold is greater than or equal to E, then the overcharge threshold is greater than or equal to E. 额定 The battery level, for example, the overcharge threshold is 1.05E. 额定 .

[0114] The preset coefficients can be determined using at least one of the following two methods.

[0115]

Method 1

[0116]

Method 2

[0117] Regarding Method 1, query the mileage of the vehicle containing the power battery (i.e., the vehicle using this power battery as its power source), and determine the value of the preset coefficient based on the mileage. Generally, the longer the mileage, the smaller the preset coefficient, which corresponds to a lower overcharge threshold.

[0118] For example, if the mileage is less than 30,000 kilometers, the vehicle can be considered a new car, and the preset coefficient can be 1.1; if the mileage is greater than 30,000 kilometers but less than 50,000 kilometers, the preset coefficient can be 1.05; if the mileage is greater than 50,000 kilometers, the preset coefficient can be 1.02.

[0119] Regarding method two, the capacity decay rate indicates the lifespan of the power battery. Relatively speaking, the lower the capacity decay rate, the longer the lifespan of the power battery, and vice versa.

[0120] The capacity decay rate can be determined based on the rated capacity and measured capacity of the power battery. The measured capacity refers to the maximum capacity of the power battery after it is fully charged at the current stage. The rated capacity is a fixed parameter given to the power battery at the factory, and it will not change as the usage time of the power battery increases. However, the measured capacity will gradually decrease as the usage time of the power battery increases, meaning that the measured capacity represents the actual capacity of the power battery during its actual service life.

[0121] The capacity degradation rate of a power battery can be determined by the percentage between the measured capacity value and the rated capacity value. A higher capacity degradation rate indicates a shorter battery lifespan, resulting in a smaller preset coefficient and a lower overcharge threshold. Conversely, a lower capacity degradation rate indicates a longer battery lifespan, resulting in a larger preset coefficient and a higher overcharge threshold.

[0122] For example, when the capacity decay rate is greater than 95%, the vehicle can be considered a new vehicle, and the preset coefficient can be 1.1; when the capacity decay rate is greater than 90% and less than 95%, the preset coefficient can be 1.05; when the capacity decay rate is greater than 80% and less than 90%, the preset coefficient can be 1.02.

[0123] Regarding step S15, if the actual charge amount is greater than or equal to the overcharge threshold, the charging circuit of the power battery is disconnected.

[0124] When the actual charge amount is greater than or equal to the overcharge threshold, it indicates that the power battery is already in an overcharged state, or that the power battery is about to enter an overcharged state. If the power battery continues to be charged at this time, it will shorten the life of the power battery. In order to reduce the impact on the life of the power battery, the power battery needs to be stopped from charging, that is, the charging circuit of the power battery needs to be disconnected. This can be achieved by controlling the relay of the high voltage circuit where the power battery is located to disconnect.

[0125] After the charging circuit of the power battery is disconnected, it is also possible to prevent the power battery from re-entering the charging mode while the current connection between the power battery and the charging equipment remains intact. This fundamentally prevents the power battery from being recharged again, thus avoiding the possibility of overcharging at the source.

[0126] In this embodiment, after the power battery completes the charging process and stops charging, it detects whether the connection between the power battery and the charging equipment is disconnected. If the connection between the power battery and the charging equipment is not disconnected, it continuously monitors whether the power battery re-enters the charging mode. If the power battery re-enters the charging mode, it monitors the actual charge amount stored after recharging. If the actual charge amount is greater than or equal to the overcharge threshold, it controls the power battery's charging circuit to disconnect, thereby intervening in time to prevent the power battery from overcharging. The overcharge threshold is a higher overcharge threshold than the rated charge amount of the power battery, used to determine whether the power battery is about to reach an overcharged state or has already reached an overcharged state. After determining that the power battery is about to reach or has already reached an overcharged state, it controls the power battery's charging circuit to disconnect.

[0127] As can be seen, in this embodiment, after the power battery is fully charged and charging is stopped, the connection between the power battery and the charging equipment is continuously monitored. If the connection remains intact, the system monitors whether the power battery has entered a recharging state. If so, based on an overcharge threshold higher than the power battery's rated charge capacity, it determines whether the power battery is about to reach or has already reached an overcharge state during the recharging process. This means determining whether continuing to charge the power battery would negatively impact its lifespan. Once it is determined that continuing to charge the power battery would damage it, the charging circuit is disconnected before a significant negative impact on the battery's lifespan is achieved. This reduces the probability of the power battery continuing to charge after being fully charged, thus reducing the likelihood of overcharging and significantly decreasing the chance of a shortened lifespan due to overcharging, thereby extending the power battery's service life. Furthermore, stopping charging after a full charge saves energy; disconnecting the charging circuit after a full charge also improves the safety of the power battery and the vehicle.

[0128] Based on the same inventive concept, this application provides as follows: Figure 2 The above-displayed device is an overcharge protection device for a power battery. The device includes:

[0129] The connection detection module 21 is used to detect whether the connection between the power battery and the charging equipment is disconnected after the power battery has completed the charging process and stopped charging.

[0130] The recharge monitoring module 22 is used to monitor whether the power battery re-enters the charging mode when the connection between the power battery and the charging equipment is not disconnected.

[0131] The charge amount monitoring module 23 is used to monitor the actual charge amount stored in the power battery after the power battery re-enters the charging mode.

[0132] The judgment module 24 is used to determine whether the actual charging amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charging amount of the power battery.

[0133] The control module 25 is used to disconnect the charging circuit of the power battery if the actual charging amount is greater than or equal to the overcharge threshold.

[0134] Furthermore, the charge volume monitoring module 23 includes:

[0135] The normal full charge acquisition submodule is used to acquire the normal full charge stored in the power battery when the charging process is completed and charging stops.

[0136] The abnormal charge amount monitoring submodule is used to monitor the abnormal charge amount stored in the power battery after the power battery re-enters the charging mode.

[0137] The charge amount monitoring submodule is used to determine the actual charge amount stored in the power battery after it re-enters the charging mode, based on normal full charge and abnormal charge amount.

[0138] Furthermore, the abnormal filling volume monitoring submodule is specifically used for:

[0139] Based on the real-time charging temperature, real-time current, real-time voltage, and charging time after the power battery re-enters the charging mode, the abnormal charge amount stored in the power battery after re-entering the charging mode is determined.

[0140] Furthermore, the abnormal filling volume monitoring submodule is specifically used for:

[0141] Based on the real-time charging temperature, real-time current and charging time after the power battery re-enters the charging mode, the abnormal capacity value stored in the power battery after re-entering the charging mode is determined.

[0142] Based on the real-time charging temperature, real-time voltage, and actual capacity value of the power battery after it re-enters the charging mode, the abnormal charge value stored in the power battery after re-entering the charging mode is determined; the abnormal charge amount includes at least one parameter value among the abnormal capacity value and the abnormal charge value.

[0143] Furthermore, the judgment module 24 includes:

[0144] The overcharge threshold determination submodule is used to determine the overcharge threshold corresponding to the power battery at the current charging temperature based on the current charging temperature of the power battery during the recharging process corresponding to the actual charging amount.

[0145] The judgment submodule is used to determine whether the actual charging amount is greater than or equal to the overcharge threshold corresponding to the current charging temperature.

[0146] Furthermore, the control module 25 is specifically used for:

[0147] The relay controlling the high-voltage circuit containing the power battery is disconnected.

[0148] Furthermore, the device also includes a blocking module for:

[0149] After the charging circuit of the power battery is disconnected, the power battery is prohibited from re-entering the charging mode if the current connection between the power battery and the charging equipment is not disconnected.

[0150] Based on the same inventive concept, this application provides as follows: Figure 3 An electronic device shown includes:

[0151] Processor 31;

[0152] Memory 32 is used to store executable instructions of processor 31;

[0153] The processor 31 is configured to execute an overcharge protection method for a power battery as described above.

[0154] Based on the same inventive concept, this application provides a non-transitory computer-readable storage medium, which, when the instructions in the storage medium are executed by the processor 31 of an electronic device, enables the electronic device to implement an overcharge protection method for a power battery as described above.

[0155] Since the electronic device described in this embodiment is an electronic device used to implement the information processing method in the embodiments of this application, those skilled in the art can understand the specific implementation methods and various variations of the electronic device in this embodiment based on the information processing method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any electronic device used by those skilled in the art to implement the information processing method in the embodiments of this application falls within the scope of protection of this application.

[0156] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0157] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0158] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0159] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0160] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0161] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for preventing overcharging of a power battery, characterized in that, The method includes: After the power battery completes the charging process and stops charging, it is detected whether the connection between the power battery and the charging equipment is disconnected. If the connection between the power battery and the charging device is not disconnected, monitor whether the power battery re-enters the charging mode; Monitor the actual charge amount stored in the power battery after it re-enters the charging mode. Determine whether the actual charge amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charge amount of the power battery. If the actual charge amount is greater than or equal to the overcharge threshold, the charging circuit of the power battery is disconnected. The step of determining whether the actual charge amount is greater than or equal to the overcharge threshold includes: Based on the current charging temperature of the power battery during the recharging process corresponding to the actual charging amount, determine the overcharge threshold of the power battery at the current charging temperature. Determine whether the actual charge amount is greater than or equal to the overcharge threshold corresponding to the current charging temperature; The overcharge threshold at a certain temperature is determined based on a preset coefficient and the rated charge amount of the power battery; the preset coefficient is determined based on the mileage of the vehicle where the power battery is located, or based on the capacity decay rate of the power battery; the preset coefficient is greater than 1; the longer the mileage or the greater the capacity decay rate, the lower the corresponding overcharge threshold.

2. The method as described in claim 1, characterized in that, The monitoring of the actual charge amount stored in the power battery after the power battery re-enters the charging mode includes: Obtain the normal full charge stored in the power battery when the charging process is completed and charging stops; Monitor the abnormal charge amount stored in the power battery after the power battery re-enters the charging mode; Based on the normal full charge and the abnormal charge amount, determine the actual charge amount stored in the power battery after the power battery re-enters the charging mode.

3. The method as described in claim 2, characterized in that, The monitoring of abnormal charge levels stored in the power battery after the power battery re-enters the charging mode includes: Based on the real-time charging temperature, real-time current, real-time voltage, and charging time after the power battery re-enters the charging mode, the abnormal charge amount stored in the power battery after re-entering the charging mode is determined.

4. The method as described in claim 3, characterized in that, The step of determining the abnormal charge amount stored in the power battery after it re-enters the charging mode based on the real-time charging temperature, real-time current, real-time voltage, and charging time includes: Based on the real-time charging temperature, real-time current, and charging time of the power battery after it re-enters the charging mode, the abnormal capacity value stored in the power battery after it re-enters the charging mode is determined. Based on the real-time charging temperature, real-time voltage, and abnormal capacity value after the power battery re-enters the charging mode, the abnormal charge value stored in the power battery after re-entering the charging mode is determined; the abnormal charge amount includes at least one parameter value among the abnormal capacity value and the abnormal charge value.

5. The method as described in claim 1, characterized in that, The method of disconnecting the charging circuit of the power battery includes: The relay controlling the high-voltage circuit containing the power battery is disconnected.

6. The method as described in claim 1, characterized in that, After the charging circuit of the power battery is disconnected, the method further includes: Without disconnecting the current connection between the power battery and the charging device, the power battery is prohibited from re-entering the charging mode.

7. An overcharge protection device for a power battery, characterized in that, The device includes: The connection detection module is used to detect whether the connection between the power battery and the charging equipment is disconnected after the power battery has completed the charging process and stopped charging. The recharge monitoring module is used to monitor whether the power battery re-enters the charging mode when the connection between the power battery and the charging device is not disconnected; The charge amount monitoring module is used to monitor the actual charge amount stored in the power battery after the power battery re-enters the charging mode; The judgment module is used to determine whether the actual charging amount is greater than or equal to the overcharge threshold; the overcharge threshold is greater than or equal to the rated charging amount of the power battery. The control module is used to control the charging circuit of the power battery to disconnect if the actual charging amount is greater than or equal to the overcharge threshold. The judgment module includes: The overcharge threshold determination submodule is used to determine the overcharge threshold corresponding to the power battery at the current charging temperature based on the current charging temperature of the power battery during the recharging process corresponding to the actual charging amount. The judgment submodule is used to determine whether the actual charging amount is greater than or equal to the overcharge threshold corresponding to the current charging temperature; the overcharge threshold corresponding to a certain temperature is determined based on a preset coefficient and the rated charging amount of the power battery; the preset coefficient is determined based on the driving mileage of the vehicle where the power battery is located, or based on the capacity decay rate of the power battery; the preset coefficient is greater than 1; the longer the driving mileage or the greater the capacity decay rate, the lower the corresponding overcharge threshold.

8. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute a method for preventing overcharging of a power battery as described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform an overcharge protection method for a power battery as described in any one of claims 1 to 6.

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