Battery management method and related device

Abstract

The invention discloses a battery management method and a related device, the battery management method is applied to a battery system, the battery system comprises a battery pack and a charger, the charger charges the battery pack, and the battery pack comprises a plurality of batteries connected in series; the battery management method comprises the following steps: acquiring an activation signal, and enabling a battery system to enter an activation mode according to the activation signal; acquiring parameters of the battery system; when the parameter of the battery system is smaller than a first set value, triggering a primary protection mechanism; when the parameter of the battery system is greater than or equal to a first set value and less than a second set value, triggering a secondary protection mechanism; and when the parameter of the battery system is greater than or equal to a second set value, triggering a three-level protection mechanism. According to the invention, a hierarchical protection mechanism can be provided to ensure that the battery system can be effectively protected in different states.

Description

Technical Field

[0001] The present invention relates to the technical field of battery system management, and in particular to a battery management method and related device. Background Art

[0002] With the rapid development of electric vehicles, energy storage systems, and portable electronic devices, the battery, as the core energy storage unit, has received extensive attention for its performance and safety. A battery pack is usually composed of multiple single cells connected in series or parallel. Due to differences in manufacturing processes, usage environments, and aging degrees, inconsistencies in parameters such as voltage and capacity are likely to occur among single cells. Such inconsistencies will lead to a decline in the overall performance of the battery pack and even pose safety hazards, such as overcharging, over-discharging, overheating, etc.

[0003] In the prior art, battery management systems are widely used to monitor and manage the state of battery packs. However, the traditional battery management methods have the following problems:

[0004] (1) Traditional protection mechanisms are usually based on fixed thresholds and cannot dynamically adjust the protection strategy according to the actual state of the battery (such as aging degree, ambient temperature, charge and discharge history, etc.), resulting in unsatisfactory protection effects.

[0005] (2) The problem of inconsistency among single cells in the battery pack has not been effectively solved, and there is a lack of an efficient balancing function, leading to a shortened overall life of the battery pack.

[0006] (3) In the non-working state of the battery system, traditional management methods have not effectively reduced energy consumption, resulting in energy waste.

[0007] (4) In the prior art, the mode switching of the battery system (such as the sleep mode and the activation mode) usually relies on simple logical judgments and lacks a comprehensive analysis of the battery state and intelligent decision-making.

[0008] To solve any of the above problems, the present invention provides a battery management method and related device. Summary of the Invention

[0009] The object of the present invention is to provide a battery management method and related device, which can provide a hierarchical protection mechanism to ensure that the battery system can be effectively protected in different states.

[0010] The object of the present invention is achieved by the following technical solutions:

[0011] On the one hand, the present invention provides a battery management method applied to a battery system, where the battery system includes a battery pack and a charger, the charger charges the battery pack, and the battery pack includes multiple batteries connected in series;

[0012] The battery management method includes the following steps:

[0013] Obtain an activation signal, and according to the activation signal, put the battery system into an activation mode;

[0014] Obtain the parameters of the battery system;

[0015] When the parameters of the battery system are less than the first set value, trigger a primary protection mechanism;

[0016] When the parameters of the battery system are greater than or equal to the first set value and less than the second set value, trigger a secondary protection mechanism;

[0017] When the parameters of the battery system are greater than or equal to the second set value, trigger a tertiary protection mechanism.

[0018] Beneficial effects of the above solution: According to the parameters of the battery system (such as voltage, current, temperature, etc.), the present invention dynamically triggers different levels of protection measures, provides a hierarchical protection mechanism, and ensures that the battery system can be effectively protected in different states. In addition, by setting the first set value and the second set value, refined management and protection of the battery system are realized, avoiding problems of overprotection or underprotection, prolonging the service life of the battery pack, and reducing potential safety hazards caused by abnormal parameters.

[0019] Further, the obtaining of the activation signal and putting the battery system into the activation mode according to the activation signal includes:

[0020] When the activation signal is an empty set, close the preselected circuit module, and the battery system enters the sleep mode;

[0021] When the activation signal is a non-empty set, open the preselected circuit module, the battery system enters the activation mode, and control the charging path or the discharging path of the battery pack to conduct;

[0022] Beneficial effects of the above solution: By judging whether the activation signal is an empty set, the present invention realizes the intelligent switching between the sleep mode and the activation mode of the battery system, reducing the energy consumption of the system in the non-working state. In addition, in the activation mode, by controlling the conduction of the charging path or the discharging path, it is ensured that the battery system can perform charge and discharge operations according to requirements, improving the flexibility and response speed of the system

[0023] Further, the obtaining of the activation signal and putting the battery system into the activation mode according to the activation signal includes:

[0024] Determine the switching strategy between the sleep mode and the activation mode according to the parameters of the battery system:

[0025] In response to the switching strategy being to switch to the sleep mode, the preselected circuit modules are turned off, and the battery system enters the sleep mode;

[0026] In response to the switching strategy being to switch to the active mode, the preselected circuit modules are turned on, and the battery system enters the active mode.

[0027] Advantages of the above solution: According to the parameters of the battery system, the present invention dynamically adjusts the switching strategy between the sleep mode and the active mode, further optimizing the energy consumption management of the battery system. Meanwhile, in the sleep mode, the preselected circuit modules can be turned off to reduce its own power consumption and extend the battery life.

[0028] Further, making the battery system enter the active mode and controlling the charging path or the discharging path of the battery pack to conduct includes:

[0029] Obtaining an instruction, where the instruction includes a charging instruction or a discharging instruction;

[0030] Generating a charging control signal or a discharging control signal according to the instruction and the parameters of the battery system:

[0031] In response to the charging control signal being a high-level signal, making the charging instruction take effect and making the charging path conduct;

[0032] In response to the discharging control signal being a high-level signal, making the discharging instruction take effect and making the discharging path conduct.

[0033] Advantages of the above solution: The present invention realizes precise control of the charging and discharging processes by obtaining the charging instruction or the discharging instruction and generating a control signal in combination with the parameters of the battery system. In addition, the mechanism triggered by the high-level signal is simple and reliable, ensuring the efficient conduction of the charging path and the discharging path, and improving the stability and safety of the system.

[0034] Further, the step of in response to the discharging control signal being a high-level signal, making the discharging instruction take effect and making the discharging path conduct includes:

[0035] In response to the power supply being powered on and the charge pump being powered on for a preset duration, driving the MOSFET switch of the discharging path to conduct for positive terminal discharging;

[0036] Advantages of the above solution: The present invention realizes the positive terminal discharging function by controlling the conduction of the MOSFET switch, ensuring the efficiency and safety of the discharging process. In addition, driving the MOSFET switch of the discharging path to conduct after the power supply is powered on and the charge pump is powered on for a preset duration can ensure the power supply stability and avoid circuit abnormalities caused by turning on the NMOS transistor when the power supply is not fully stable.

[0037] Further, through the battery balancing function, the voltages of individual cells in the battery pack are balanced.

[0038] Beneficial effects of the above solution: By combining the battery balancing function, the present invention further optimizes the voltage consistency of individual cells in the battery pack and extends the service life of the battery pack.

[0039] Further, the balancing of the voltages of individual cells in the battery pack by the battery balancing function includes:

[0040] Transferring energy from a high-voltage battery to a low-voltage battery through a DC-DC converter or a capacitor / inductor element;

[0041] Beneficial effects of the above solution: The present invention realizes energy transfer through a DC-DC converter or a capacitor / inductor element, improving the efficiency of battery balancing and the energy utilization rate.

[0042] Further, turn on the control switch to connect the high-voltage battery to a resistor to consume excess energy.

[0043] Beneficial effects of the above solution: The present invention provides a low-cost and easy-to-implement balancing solution by consuming excess energy through a resistor, which is applicable to different application scenarios.

[0044] Further, the parameters of the battery system include the aging degree of the battery, the ambient temperature, and the charge-discharge history;

[0045] The adjustment of the first set value and the second set value includes:

[0046] Dynamically adjusting the first set value and the second set value according to the aging degree of the battery, the ambient temperature, and the charge-discharge history.

[0047] Beneficial effects of the above solution: The present invention dynamically adjusts the first set value and the second set value according to the aging degree of the battery, the ambient temperature, and the charge-discharge history, making the protection mechanism more in line with the actual state of the battery, improving the adaptability and accuracy of the protection mechanism, and avoiding problems such as false triggering or insufficient protection caused by fixed thresholds.

[0048] Further, the parameters of the battery system include battery voltage, current, temperature, and charge-discharge history;

[0049] The adjustment of the primary protection mechanism, the secondary protection mechanism, and the tertiary protection mechanism includes:

[0050] Dynamically adjusting the primary protection mechanism, the secondary protection mechanism, and the tertiary protection mechanism according to battery voltage, current, temperature, and charge-discharge history.

[0051] Advantages of the above solution: According to the battery voltage, current, temperature, and charge and discharge history, the present invention dynamically adjusts the primary, secondary, and tertiary protection mechanisms, making the protection strategy more flexible and precise, improving the safety and reliability of the battery system, and reducing the failure risk caused by abnormal parameters.

[0052] In a second aspect, the present invention provides a battery management system, including:

[0053] An activation unit for obtaining an activation signal and causing the battery system to enter an activation mode according to the activation signal;

[0054] A parameter acquisition unit for acquiring parameters of the battery system;

[0055] A primary protection unit for triggering a primary protection mechanism when the parameters of the battery system are less than a first set value;

[0056] A secondary protection unit for triggering a secondary protection mechanism when the parameters of the battery system are greater than or equal to the first set value and less than a second set value;

[0057] A tertiary protection unit for triggering a tertiary protection mechanism when the parameters of the battery system are greater than or equal to the second set value.

[0058] Advantages of the above solution: Through the collaborative work of the activation unit, parameter acquisition unit, and hierarchical protection unit, the present invention realizes the comprehensive management and protection of the battery system. In addition, the hierarchical protection mechanism improves the safety and stability of the system and reduces the damage risk of the battery system caused by abnormal parameters.

[0059] In a third aspect, the present invention provides a battery management device, including: a processor, a memory, and a management control program stored on the memory, and the processor executes the management control program to implement the steps of the above battery management method.

[0060] Advantages of the above solution: Through a programmed control method, the present invention realizes the intelligence and automation of battery management, improving the scalability and applicability of the system.

[0061] Compared with the prior art, the advantages of the present invention at least include:

[0062] According to the parameters of the battery system (such as voltage, current, temperature, etc.), the present invention dynamically triggers different levels of protection measures, providing a hierarchical protection mechanism to ensure that the battery system can be effectively protected in different states. In addition, by setting the first set value and the second set value, the refined management and protection of the battery system are realized, avoiding the problems of overprotection or underprotection, extending the service life of the battery pack, and reducing the safety hazards caused by abnormal parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a schematic flowchart of a battery management method according to an embodiment of the present invention. Detailed implementation manners

[0064] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be more complete and comprehensive, and the concept of the example embodiments will be fully conveyed to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.

[0065] In the present invention, the words expressing positions and directions are described by taking the accompanying drawings as examples, but can be changed according to needs, and all the changes made are included in the protection scope of the present invention.

[0066] The battery management method of the present invention is applied to a battery system, the battery system includes a battery pack and a charger, the charger charges the battery pack, and the battery pack includes a plurality of batteries connected in series.

[0067] Referring to Figure 1 , the battery management method of the present invention includes step SS1-step SS3.

[0068] Step SS1: Obtain an activation signal, and enter the activation mode for the battery system according to the activation signal.

[0069] In application, step SS1 includes: step SS11-step SS12. Further, step SS1 may also include: step SS13-SS15.

[0070] Step SS11: When the activation signal is an empty set, close a preselected circuit module, and the battery system enters the sleep mode.

[0071] In application, when the battery system enters the sleep mode, closing some unnecessary circuit modules can reduce its own power consumption and extend the standby time. For example: close the main processor / microcontroller to reduce the power consumption of the core computing unit; close the wireless communication module (such as Wi-Fi, Bluetooth, cellular module); close unnecessary sensors (such as light sensors, etc.) to reduce the power consumption of data acquisition; close the display screen; close the peripheral interface to reduce the power consumption of external device connection; close the audio-related circuits such as speakers and microphones; close the positioning function.

[0072] In actual application, the preselected circuit module may include: the main processor, microcontroller, wireless communication module, display screen, and alarm.

[0073] Step SS12: When the activation signal is a non-empty set, turn on the preselected circuit module, the battery system enters the activation mode, and control the charging path or the discharging path of the battery pack to conduct.

[0074] In application, when the activation signal is a non-empty set, the activation signal includes a low-level activation signal or a key signal.

[0075] In actual application, step SS12 includes: steps SS121 - SS124.

[0076] Step SS121: Obtain an instruction, where the instruction includes a charging instruction or a discharging instruction.

[0077] Step SS122: Generate a charging control signal or a discharging control signal according to the instruction and the parameters of the battery system.

[0078] In application, the charging control signal includes a high-level signal or a low-level signal, and the discharging control signal includes a high-level signal or a low-level signal. If the charging conditions are not met, the charging control signal is a low-level signal and the charging instruction is invalid. If the charging conditions are met, the charging control signal is a high-level signal and the charging instruction is valid. If the discharging conditions are met, the discharging control signal includes a low-level signal and the discharging instruction is invalid. If the discharging conditions are not met, the discharging control signal includes a high-level signal and the discharging instruction is valid.

[0079] In actual application, the parameters of the battery system (such as voltage, current, temperature, SOC, etc.) will affect the generation of high and low level signals.

[0080] When the following conditions are met, the charging control signal is a high-level signal:

[0081] The battery voltage is lower than the charging cut-off voltage; the battery temperature is within the allowable charging range (for example, 0°C to 45°C); the battery SOC (State of Charge) is lower than the set charging threshold (for example, SOC < 95%); the charging current is within the safe range.

[0082] When the following conditions are met, the charging control signal is a low-level signal:

[0083] The battery voltage reaches or exceeds the charging cut-off voltage; the battery temperature exceeds the allowable charging range; the battery SOC reaches or exceeds the set charging threshold (for example, SOC ≥ 95%); the charging current exceeds the safe range.

[0084] When the following conditions are met, the discharging control signal is a high-level signal:

[0085] The battery voltage is higher than the discharge cut-off voltage; the battery temperature is within the allowable discharge range (e.g., -10°C to 60°C); the battery SOC is higher than the set discharge threshold (e.g., SOC > 5%); the discharge current is within the safe range.

[0086] When the following conditions are met, the discharge control signal is a low-level signal: the battery voltage is lower than the discharge cut-off voltage; the battery temperature exceeds the allowable discharge range; the battery SOC is lower than the set discharge threshold (e.g., SOC ≤ 5%); the discharge current exceeds the safe range.

[0087] In some embodiments, the charge cut-off voltage is 4.2V; the discharge cut-off voltage is 3.0V; the charge temperature range is 0°C to 45°C; the discharge temperature range is -10°C to 60°C; the charge SOC range is SOC < 95%; the discharge SOC range is SOC > 5%.

[0088] Step SS123: In response to the charge control signal being a high-level signal, make the charge instruction effective and turn on the charge path.

[0089] Step SS124: In response to the discharge control signal being a high-level signal, make the discharge instruction effective and turn on the discharge path.

[0090] During application, step SS124 includes: step SS1241 - step SS1242.

[0091] Step SS1241: In response to the power supply being powered on and the charge pump being powered on for a preset duration, drive the MOSFET switch of the discharge path to conduct and perform positive terminal discharge.

[0092] Step SS1242: Through the battery balancing function, balance the voltages of each single battery in the battery pack.

[0093] During application, step SS1242 includes: step SS12421 - step SS12422.

[0094] Step SS12421: Through a DC-DC converter or a capacitor / inductor component, transfer energy from the high-voltage battery to the low-voltage battery.

[0095] Step SS12422: Turn on the control switch to connect the high-voltage battery to a resistor and consume the excess energy.

[0096] Step SS13: Determine the switching strategy between the sleep mode and the active mode according to the parameters of the battery system.

[0097] In some embodiments, when the following conditions are met, enter the sleep mode:

[0098] The battery system is in an idle state (no charge or discharge operation) for a long time (e.g., 10 minutes); parameters such as battery voltage, the remaining battery charge SOC (which can be estimated by the current integration method (Coulomb counting method) or voltage method), and battery temperature are within the safe range; and external signals indicate that activation is not required (such as no user operation, no communication request, etc.).

[0099] During application, the safe range of battery voltage is 3.0V to 4.2V; the safe range of battery SOC is 10% to 95%; and the safe range of battery temperature is 0°C to 45°C.

[0100] During actual application, the safe ranges of battery voltage, battery SOC, and battery temperature can be adjusted according to the actual application scenario. It can also be dynamically adjusted according to the historical data and power of the battery

[0101] In some embodiments, when any of the following conditions is met, the sleep mode is exited and the activation mode is entered:

[0102] An external activation signal is detected (such as user operation, communication request, etc.); the battery system needs to perform a charge or discharge operation; or battery parameters are abnormal (such as too low voltage, too high temperature, etc.), and the system needs to be woken up for processing.

[0103] During application, abnormal battery parameters include the battery voltage being lower than the discharge cut-off voltage or higher than the charge cut-off voltage; the battery SOC being lower than the minimum threshold or higher than the maximum threshold; and the battery temperature exceeding the safe range.

[0104] During actual application, the system is regularly woken up to check the battery parameters (such as waking up once every 10 minutes).

[0105] Step SS14: In response to the switching strategy being switched to the sleep mode, close the preselected circuit module, and the battery system enters the sleep mode.

[0106] Step SS15: In response to the switching strategy being switched to the activation mode, open the preselected circuit module, and the battery system enters the activation mode.

[0107] Step SS2: Obtain the parameters of the battery system.

[0108] During application, the parameters of the battery system include battery voltage, battery current, battery temperature, the degree of battery aging, and charge and discharge history.

[0109] During actual application, the battery voltage is used to collect the voltage of the battery pack in real time through a voltage sensor; the battery current is used to collect the charging and discharging current of the battery pack in real time through a current sensor (such as a Hall sensor or a shunt resistor); the battery temperature is used to collect the temperature of the battery pack in real time through a temperature sensor (such as an NTC thermistor); the degree of battery aging is estimated based on historical charging and discharging data, internal resistance changes, and capacity attenuation; the charging and discharging history includes historical data such as the number of charging and discharging cycles, the depth of charging and discharging, and the charging and discharging rate of the battery.

[0110] In some preferred embodiments, the parameters of the battery system include the state of health (SOH) of the battery, and the state of health of the battery is estimated by the ratio of the actual capacity of the battery to the rated capacity (SOH). For example, SOH = actual capacity / rated capacity × 100%.

[0111] Step SS3: Trigger the protection mechanism according to the relationship between the parameters of the battery system and the preset set values.

[0112] During application, adjust the set values dynamically according to the parameters of the battery system; adjust the protection mechanism dynamically according to the parameters of the battery system.

[0113] During actual application, the set values include a first set value and a second set value, and the first set value and the second set value are adjusted dynamically according to the parameters of the battery system. The protection mechanism includes a primary protection mechanism, the secondary protection mechanism, and the tertiary protection mechanism, and the primary protection mechanism, the secondary protection mechanism, and the tertiary protection mechanism are adjusted dynamically according to the parameters of the battery system. Refer to Figure 1 In some preferred embodiments, step SS3 includes: steps SS31 - SS33.

[0114] Step SS31: When the parameters of the battery system are less than the first set value, trigger the primary protection mechanism.

[0115] Step SS32: When the parameters of the battery system are greater than or equal to the first set value and less than the second set value, trigger the secondary protection mechanism.

[0116] Step SS33: When the parameters of the battery system are greater than or equal to the second set value, trigger the tertiary protection mechanism.

[0117] The parameters of the battery system include voltage; the first set value includes a first voltage set value; the second set value includes a second voltage set value.

[0118] In some embodiments, the parameters of the battery system include the battery voltage, the first set value includes a first voltage set value; the second set value includes a second voltage set value.

[0119] When the battery voltage is less than the first voltage set value (e.g., 3.0V), the primary protection mechanism is triggered, that is, the under-voltage protection mode is entered. In application, in this mode, the system will start the constant-current charging mode and charge the battery quickly with the maximum safe current (e.g., 1C, where C is the battery capacity) until the battery voltage returns to the safe range. At the same time, the system will issue a low-voltage warning signal (such as through an LED indicator or a communication interface) to prompt the user that the battery voltage is too low and there may be an abnormality.

[0120] When the battery voltage is less than the second voltage set value (e.g., 4.25V) and greater than or equal to the first voltage set value (e.g., 3.0V), the secondary protection mechanism is triggered, that is, the constant-voltage charging mode is entered. In application, in this mode, the system will keep the charging voltage constant (e.g., 4.2V) and gradually reduce the charging current until the current drops to the cut-off current (e.g., 0.05C). The main goal of this stage is to ensure that the battery is fully charged while avoiding overcharging and protecting the battery life.

[0121] When the battery voltage is greater than the second voltage set value (e.g., 4.25V), the tertiary protection mechanism is triggered, that is, overcharge protection is started, the charging circuit is cut off to stop charging, and overcharging is prevented.

[0122] Preferably, for batteries with a higher degree of aging, the upper limit of the second voltage set value is appropriately reduced to avoid overcharging. For example, the second voltage set value of an aging battery can be set to 80% of the rated voltage to avoid the risk of overcharging. In addition, the second voltage set value can also be dynamically adjusted according to the state of health (SOH) of the battery to further optimize the charging process and extend the battery life.

[0123] In some embodiments, the parameters of the battery system include the battery current, the first set value includes the first current set value; the second set value includes the second current set value.

[0124] When the battery current is less than the first current set value (e.g., 0.1C, where C is the battery capacity), the primary protection mechanism is triggered, that is, the low-current protection mode is entered. In application, the system will detect the battery status and judge whether there is an abnormality (such as battery aging, poor contact, or short-circuit risk). If an abnormality is detected, the system will issue a warning signal (such as through an LED indicator or a communication interface) and suspend charging or discharging until the problem is solved.

[0125] When the battery current is less than the second current setting value (e.g., 1C) and greater than or equal to the first current setting value (e.g., 0.1C), the secondary protection mechanism is triggered, that is, the current limiting protection mode is entered. In application, in this mode, the system will limit the charging or discharging current of the battery to ensure that the current does not exceed the safe range. For example, during charging, the system will limit the charging current to below 0.5C; during discharging, the system will limit the discharging current to below 80% of the rated maximum discharging current to prevent the battery from overheating or being damaged.

[0126] When the battery current is greater than the second current setting value (e.g., 1.5C), the tertiary protection mechanism is triggered, that is, the overcurrent protection mode is entered, the charging current is reduced or charging is paused to prevent the battery from overheating or being damaged. In application, if charging continues, the charging current is reduced to the safe range (such as 0.5C). At the same time, the system will record the overcurrent event (such as through a log or communication interface) and issue an alarm signal to prompt the user to check the battery or load status.

[0127] In actual application, for batteries with frequent charge and discharge, the standard charging current and standard discharging current are appropriately reduced to extend the battery life. For example, batteries with frequent charge and discharge can be set to 90% of the rated current. For batteries that are often deeply discharged, the standard charging current is appropriately increased to shorten the charging time. For example, deeply discharged batteries can be set to 110% of the rated current.

[0128] Preferably, for batteries with a higher degree of aging, the first current setting value and the second current setting value can be dynamically adjusted. For example, the first current setting value is reduced to 0.05C and the second current setting value is reduced to 1.2C to further protect the battery. In addition, for batteries with a higher degree of aging, the second current setting value is appropriately reduced to avoid overcharging. For example, the second current setting value of an aging battery can be set to 80% of the rated current.

[0129] In some embodiments, the parameters of the battery system include temperature, the first setting value includes a first temperature setting value; the second setting value includes a second temperature setting value.

[0130] When the temperature is the battery temperature:

[0131] The primary protection mechanism includes the following formula:

[0132] Icomp = Iref·f(T)

[0133]

[0134] Where: Icomp: Charging current after compensation; Iref: Standard charging current, generally 1C; f(T): Charging temperature protection function; Tmin: Minimum temperature allowed for the battery, generally -10°C; T: Real-time battery temperature; T1: First temperature setting value, generally 5°C.

[0135] The secondary protection mechanism includes the following formula:

[0136] Icomp = Iref·f(T)

[0137] f(T) = 1, T1 < T < T2

[0138] Where, Icomp: Charging current after compensation; Iref: Standard charging current, generally 1C; f(T): Charging temperature protection function; T: Real-time battery temperature; T1: First temperature setting value, generally 5°C; T2: Second temperature setting value, and T2 > T1, generally 40°C.

[0139] The tertiary protection mechanism includes the following formula:

[0140] Icomp = Iref·f(T)

[0141]

[0142] Where, Icomp: Charging current after compensation; Iref: Standard charging current, generally 1C; f(T): Charging temperature protection function; Tmax: Maximum temperature allowed for the battery, generally 60°C; T: Real-time battery temperature; T1: First temperature setting value, generally 5°C; T2: Second temperature setting value, and T2 > T1, generally 40°C.

[0143] In some other embodiments, the parameters of the battery system include temperature, the first setting value includes the first temperature setting value; the second setting value includes the second temperature setting value.

[0144] When the temperature is the charger temperature:

[0145] The primary protection mechanism includes the following formula:

[0146] icomp = iref·f(t)

[0147]

[0148] Wherein, icomp: compensated discharge current; iref: standard discharge current, generally 1C; f(t): discharge temperature protection function; t: real-time charger temperature; tmin: minimum temperature allowed for the charger, generally -10°C; tmax: maximum temperature allowed for the charger, generally 60°C; T1: first temperature setting value, generally 5°C.

[0149] The secondary protection mechanism includes the following formula:

[0150] icomp = iref·f(t)

[0151] f(t) = 1, T1 < t < T2

[0152] Wherein, icomp: compensated discharge current; iref: standard discharge current, generally 1C; f(t): discharge temperature protection function; t: real-time charger temperature; T1: first temperature setting value, generally 5°C; T2: second temperature setting value, and T2 > T1, generally 40°C.

[0153] The tertiary protection mechanism includes the following formula:

[0154] icomp = iref·f(t)

[0155]

[0156] Wherein, icomp: compensated discharge current; iref: standard discharge current, generally 1C; f(t): discharge temperature protection function; t: real-time charger temperature; tmax: maximum temperature allowed for the charger, generally 60°C; T1: first temperature setting value, generally 5°C; T2: second temperature setting value, and T2 > T1, generally 40°C.

[0157] In some other embodiments, the present invention also introduces a battery management system.

[0158] The battery management system of the present invention includes: an activation unit, a parameter acquisition unit, a primary protection unit, a secondary protection unit, and a tertiary protection unit.

[0159] The activation unit is used to obtain an activation signal and make the battery system enter the activation mode according to the activation signal; the parameter acquisition unit is used to obtain the parameters of the battery system; the primary protection unit is used to trigger the primary protection mechanism when the parameters of the battery system are less than the first setting value; the secondary protection unit is used to trigger the secondary protection mechanism when the parameters of the battery system are greater than or equal to the first setting value and less than the second setting value; the tertiary protection unit is used to trigger the tertiary protection mechanism when the parameters of the battery system are greater than or equal to the second setting value.

[0160] For the implementation of the specific functions of the above function modules, refer to the specific steps of the above battery management method for details.

[0161] In some other embodiments, the present invention also introduces a battery management device.

[0162] The battery management device of the present invention includes: a processor, a memory, and a management control program stored on the memory, and the processor executes the management control program to implement the steps of the above battery management method.

[0163] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principles and purposes of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A battery management method, characterized in that, Applied to a battery system, the battery system includes a battery pack and a charger, the charger charges the battery pack, and the battery pack includes a plurality of batteries connected in series; The battery management method includes the following steps: Obtain an activation signal, and enter the activation mode of the battery system according to the activation signal; Obtain the parameters of the battery system; When the parameters of the battery system are less than the first set value, trigger a primary protection mechanism; When the parameters of the battery system are greater than or equal to the first set value and less than the second set value, trigger a secondary protection mechanism; When the parameters of the battery system are greater than or equal to the second set value, trigger a tertiary protection mechanism.

2. The battery management method according to claim 1, wherein The obtaining of the activation signal and entering the activation mode of the battery system according to the activation signal includes: In response to the activation signal being an empty set, close a preselected circuit module, and the battery system enters the sleep mode; In response to the activation signal being a non-empty set, open a preselected circuit module, the battery system enters the activation mode, and control the charging path or the discharging path of the battery pack to conduct.

3. The battery management method according to claim 2, wherein The obtaining of the activation signal and entering the activation mode of the battery system according to the activation signal includes: Determine the switching strategy between the sleep mode and the activation mode according to the parameters of the battery system: In response to the switching strategy being to switch to the sleep mode, close a preselected circuit module, and the battery system enters the sleep mode; In response to the switching strategy being to switch to the activation mode, open a preselected circuit module, and the battery system enters the activation mode.

4. The battery management method according to claim 1, wherein The battery system enters the activation mode, and controls the charging path or the discharging path of the battery pack to conduct, including: Obtain an instruction, the instruction includes a charging instruction or a discharging instruction; Generate a charging control signal or a discharging control signal according to the instruction and the parameters of the battery system: In response to the charging control signal being a high-level signal, make the charging instruction effective and make the charging path conduct; In response to the discharging control signal being a high-level signal, make the discharging instruction effective and make the discharging path conduct.

5. The battery management method according to claim 4, wherein The making the discharging instruction effective and making the discharging path conduct in response to the discharging control signal being a high-level signal includes: In response to the power supply being powered on and the charge pump being powered on for a preset duration, drive the MOSFET switch of the discharging path to conduct and perform positive terminal discharging; And / or, balance the voltages of the individual batteries in the battery pack through a battery equalization function.

6. The battery management method according to claim 5, wherein The balancing the voltages of the individual batteries in the battery pack through the battery equalization function includes: Transfer energy from the high-voltage battery to the low-voltage battery through a DC-DC converter or a capacitor / inductor element; Or, turn on a control switch to connect the high-voltage battery to a resistor to consume excess energy.

7. The battery management method according to claim 1, wherein The parameters of the battery system include the aging degree of the battery, the ambient temperature, and the charge and discharge history; The adjustment of the first set value and the second set value includes: Dynamically adjust the first set value and the second set value according to the aging degree of the battery, the ambient temperature, and the charge and discharge history.

8. The battery management method according to claim 1, wherein The parameters of the battery system include the battery voltage, current, temperature, and charge and discharge history; The adjustment of the primary protection mechanism, the secondary protection mechanism, and the tertiary protection mechanism includes: Dynamically adjust the primary protection mechanism, the secondary protection mechanism, and the tertiary protection mechanism according to the battery voltage, current, temperature, and charge and discharge history.

9. A battery management system, characterized in that, Comprising: An activation unit, configured to obtain an activation signal and cause the battery system to enter an activation mode according to the activation signal; A parameter acquisition unit, configured to acquire parameters of the battery system; A primary protection unit, configured to trigger a primary protection mechanism when the parameters of the battery system are less than a first set value; A secondary protection unit, configured to trigger a secondary protection mechanism when the parameters of the battery system are greater than or equal to the first set value and less than a second set value; A tertiary protection unit, configured to trigger a tertiary protection mechanism when the parameters of the battery system are greater than or equal to the second set value.

10. A battery management device, characterized in that, Comprising: A processor, a memory, and a management control program stored on the memory, and the processor executes the management control program to implement the steps of the battery management method according to any one of claims 1 to 8.

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