WO2022241766A1 - 电池放电欠压保护方法、电池装置及用电装置 - Google Patents
电池放电欠压保护方法、电池装置及用电装置 Download PDFInfo
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- WO2022241766A1 WO2022241766A1 PCT/CN2021/095187 CN2021095187W WO2022241766A1 WO 2022241766 A1 WO2022241766 A1 WO 2022241766A1 CN 2021095187 W CN2021095187 W CN 2021095187W WO 2022241766 A1 WO2022241766 A1 WO 2022241766A1
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- battery
- discharge
- capacity ratio
- voltage value
- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000007600 charging Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 7
- 238000004146 energy storage Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000010280 constant potential charging Methods 0.000 description 2
- 238000010277 constant-current charging Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000020965 cold beverage Nutrition 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present application relates to the technical field of batteries, in particular to a battery discharge and undervoltage protection method, a battery device and an electrical device.
- the fixed undervoltage protection point is set within the range of 2.8V to 3.0V.
- the general protection point is: first-level undervoltage alarm: 3.0V , Second-level undervoltage protection: 2.9V; third-level undervoltage protection: 2.8V.
- first-level undervoltage alarm 3.0V
- Second-level undervoltage protection 2.9V
- third-level undervoltage protection 2.8V.
- the present application provides a battery discharge undervoltage protection method, a battery device and an electrical device, which can solve the problem that the discharge capacity ratio of the battery decreases at low temperature.
- the battery discharge undervoltage protection method in an embodiment of the present application includes: acquiring the temperature value and the first voltage value of the battery; determining the discharge depth of the battery according to the temperature value; determining the discharge depth of the battery according to the first voltage value The first remaining capacity ratio of the battery; according to the first remaining capacity ratio, the discharge depth and the first undervoltage threshold, determine a second undervoltage threshold to increase the discharge capacity ratio of the battery; wherein, the The first undervoltage threshold is a preset undervoltage threshold, and the second undervoltage threshold is a dynamically adjusted undervoltage threshold.
- the determining the discharge depth of the battery according to the temperature value includes: determining the temperature range corresponding to the temperature value; and determining the temperature range corresponding to the temperature range according to the temperature range. the depth of discharge.
- the determining the first remaining capacity ratio of the battery according to the first voltage value includes: determining the first remaining capacity ratio corresponding to the first voltage value according to the parameter correspondence relationship of the battery.
- the first remaining capacity ratio wherein, the corresponding parameter relationship refers to the corresponding relationship between the remaining capacity ratio and the open circuit voltage.
- the determining the second undervoltage threshold according to the first remaining capacity ratio, the depth of discharge, and the first undervoltage threshold includes: according to the first remaining capacity ratio and the Depth of discharge, determining the second remaining capacity ratio of the battery; determining a second voltage value corresponding to the second remaining capacity ratio according to the parameter correspondence; and determining a second voltage value corresponding to the second remaining capacity ratio according to the second voltage value and the first voltage value , determining the variation of the voltage value of the battery; and determining the second undervoltage threshold according to the variation of the voltage value and the first undervoltage threshold.
- the method further includes: obtaining the A third voltage value after discharge is cut off; according to the second undervoltage threshold and the third voltage value, determine whether to perform undervoltage protection on the battery.
- the determining whether to perform undervoltage protection on the battery according to the second undervoltage threshold and the third voltage value includes: determining a fourth voltage threshold according to the third voltage value. voltage value; if the fourth voltage value is less than the second undervoltage threshold, it is determined to perform undervoltage protection on the battery.
- the method before determining the first remaining capacity ratio corresponding to the first voltage value according to the parameter correspondence of the battery, the method further includes: charging the battery , until the capacity of the battery reaches the full charge capacity; obtain the full charge voltage corresponding to the full charge capacity; discharge the battery until the voltage of the battery reaches the discharge cut-off voltage; obtain the discharge process of the battery The voltage value corresponding to the voltage value and the state of charge corresponding to the voltage value; according to the voltage value and the state of charge corresponding to the voltage value, the corresponding relationship of the parameters is determined.
- the determining the second remaining capacity ratio of the battery according to the first remaining capacity ratio and the depth of discharge includes: determining the second remaining capacity ratio of the battery according to the first remaining capacity ratio.
- the battery device includes a battery, a processor, and a memory, and a computer program is stored in the memory.
- the computer program is executed by the processor, the battery discharge undervoltage protection according to the embodiment of the present application is realized. method.
- An electric device includes a load and the battery device according to the embodiment of the present application, and the battery device is used to provide electric energy for the load.
- the electrical device includes any one of a drone, an electric vehicle, an electric tool, and an energy storage product.
- the embodiment of the present application determines the second undervoltage threshold through the temperature value of the battery, the first voltage value and the first undervoltage threshold, and then determines the undervoltage threshold in different temperature ranges, so as to select different undervoltages in different temperature ranges threshold, so as to realize the dynamic adjustment of the undervoltage threshold and increase the discharge capacity ratio of the battery at low temperature. Moreover, in the embodiment of the present application, it is determined whether to perform undervoltage protection on the battery according to the third voltage of the battery after the cut-off discharge and the second undervoltage threshold, so as to avoid prematurely performing undervoltage protection on the battery, The discharge capacity ratio of the battery at low temperature is guaranteed.
- Figure 1 is a graph of the voltage versus discharge capacity ratio of a battery at different temperatures.
- FIG. 2 is a block diagram of a battery device according to an embodiment of the present application.
- FIG. 3 is a flowchart of a battery discharge undervoltage protection method according to an embodiment of the present application.
- FIG. 4 is a flow chart of a battery discharge undervoltage protection method according to another embodiment of the present application.
- FIG. 5 is a flowchart of a battery discharge undervoltage protection method according to another embodiment of the present application.
- FIG. 6 is a flowchart of a battery discharge undervoltage protection method according to another embodiment of the present application.
- FIG. 7 is a flowchart of a battery discharge undervoltage protection method according to another embodiment of the present application.
- Figure 8 is the open circuit voltage curve of the battery under different working conditions.
- Figure 9 is the open-circuit voltage curves at different temperatures after the battery has been discharged.
- FIG. 1 is a graph of the voltage-to-discharge capacity ratio of a battery at different temperatures.
- S11 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 45°C.
- S12 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 25°C.
- S13 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 15°C.
- S14 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 0°C.
- S15 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at -10°C.
- S16 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at -20°C.
- the temperature refers to the ambient temperature
- the battery at different temperatures means that the battery is at different ambient temperatures
- the voltage refers to the open circuit voltage (Open Circuit Voltage, OCV) of the battery, that is, the terminal voltage of the battery in an open circuit state.
- OCV Open Circuit Voltage
- the discharge capacity ratio refers to the percentage of the discharged capacity of the battery to the rated capacity.
- Table 1 shows the discharge capacity ratio of the battery at different temperatures. Please refer to FIG. 1 and Table 1 together. Firstly, the battery is charged at the same temperature (eg 25°C) with the same charge rate (eg 0.3C). Then, the battery is discharged at the same discharge rate (for example, 0.3C) and different temperatures until the voltage of the battery reaches the discharge cut-off voltage (for example, 2.5V). Finally, the discharge capacity ratio of the battery is determined. It can be known from Table 1 that as the temperature decreases, the discharge capacity ratio of the battery will drop sharply.
- the present application provides a battery discharge undervoltage protection method, a battery device and an electrical device, which can increase the discharge capacity ratio of the battery at low temperature.
- FIG. 2 is a block diagram of the battery device 20 .
- the battery device 20 includes a memory 21 , a processor 22 , a battery 23 and a sensor 24 , and the above components can be connected through a bus or directly.
- the memory 21 is used for storing program codes and various data, and completes program or data access during the operation of the battery device 20 .
- the memory 21 may be an internal memory of the battery device 20 , that is, a memory built in the battery device 20 . In other implementation manners, the memory 21 may also be an external memory of the battery device 20 , that is, a memory externally connected to the battery device 20 .
- the memory 21 includes a volatile or non-volatile storage device, such as a digital versatile disc (Digital Versatile Disc, DVD) or other optical discs, magnetic disks, hard disks, smart memory cards (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash memory card (Flash Card), etc.
- a digital versatile disc Digital Versatile Disc, DVD
- other optical discs magnetic disks
- hard disks smart memory cards
- smart memory cards Smart Media Card, SMC
- secure digital (Secure Digital, SD) card Secure Digital, SD card
- flash memory card Flash Card
- the processor 22 includes a central processing unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
- CPU Central Processing Unit
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- FPGA Field-Programmable Gate Array
- FPGA Field-Programmable Gate Array
- the battery 23 is a rechargeable battery for providing electric energy to the battery device 20 .
- the battery 23 may be a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-ion battery, a lithium polymer battery, a lithium iron phosphate battery, and the like.
- the battery 23 includes electric cores.
- the sensor 24 can be arranged on the surface of the electric core, and the ambient temperature can be obtained by measuring the temperature of the electric core surface.
- the sensor 24 is a negative temperature coefficient (Negative Temperature Coefficient, NTC) thermistor.
- NTC Negative Temperature Coefficient
- the battery device 20 may also include other sensors, such as a voltage sensor, a current sensor, a light sensor, a gyroscope, a hygrometer, an infrared sensor, and the like.
- the battery device 20 may also include more or fewer components, or have different configurations of components.
- the battery device 20 can be applied to an electric device 10, which includes, but is not limited to, a drone, an electric vehicle, an electric tool, an energy storage product, and the like.
- the electric tools include, but are not limited to, electric screwdrivers, electric drills, electric wrenches, angle grinders, steel machines, electric picks, electric hammers, marble machines, jigsaws, and the like.
- the energy storage products include, but are not limited to, mobile phones, tablet computers, e-book readers, computers, workstations, servers, personal digital assistants (Personal Digital Assistant, PDA), portable multimedia players (Portable Multimedia Player, PMP), Mobile medical equipment, cameras, wearable devices, photovoltaic inverters, wind power converters, energy storage systems, new energy vehicle drive systems, photovoltaic equipment, etc.
- PDA Personal Digital Assistant
- PMP portable multimedia players
- PMP Portable Multimedia Player
- Mobile medical equipment cameras, wearable devices, photovoltaic inverters, wind power converters, energy storage systems, new energy vehicle drive systems, photovoltaic equipment, etc.
- the electrical device 10 includes the battery device 20 and a load 11 , and the battery device 20 is used to provide electric energy for the load 11 .
- the load 11 includes, but is not limited to, a refrigerator, a cold drink machine, an air conditioner, an electric fan, a ventilation fan, a hot and cold air fan, an air dehumidifier, a washing machine, a clothes dryer, an electric iron, a vacuum cleaner, a floor waxing machine, a microwave oven, Induction cooker, electric oven, electric rice cooker, dish washer, electric water heater, electric blanket, electric quilt, electric clothing, space heater, electric shaver, hair dryer, hair styler, ultrasonic face wash, electric massager, Micro-projectors, TV sets, radios, tape recorders, video recorders, video cameras, combined stereos, smoke and fire alarms, electric bells, lights, computers, etc.
- the battery device 20 further includes a battery management system (Battery Management System, BMS).
- BMS Battery Management System
- the battery 23 is connected to the processor 22 through the battery management system, so as to implement functions such as charging, discharging and power consumption management through the battery management system.
- the battery management system can communicate with the energy storage converter (Power Conversion System, PCS).
- PCS Power Conversion System
- FIG. 3 is a flow chart of a battery discharge undervoltage protection method according to an embodiment.
- the battery discharge undervoltage protection method includes the following steps:
- the temperature value of the battery 23 refers to the temperature value of the environment where the battery 23 is located.
- the quiescent state refers to a state in which the charging or discharging current of the battery 23 approaches 0A. In one of the implementation manners, the state in which the charging or discharging current of the battery 23 is less than 0.5A is defined as the resting state.
- the battery device 20 acquires the temperature value of the battery 23 (for example, any temperature value from -20° C. to 50° C.) through the sensor 24 .
- the battery device 20 obtains the first voltage value U 1 of the battery 23 (for example, any voltage value from 2.0V to 3.6V) through the battery management system.
- the battery device 20 can obtain the temperature value of the battery 23 and the first voltage value U 1 in real time, or obtain the temperature of the battery 23 according to a preset time interval (such as 1s or 2s, etc.). value and the first voltage value U 1 .
- the preset time interval can be determined according to specific requirements.
- the depth of discharge refers to the percentage of the discharged capacity of the battery 23 to the rated capacity. It can be understood that, in the embodiment of the present application, the value of the discharge depth of the battery 23 is equal to the value of the discharge capacity ratio.
- the battery device 20 determines the temperature range corresponding to the temperature value according to the collected temperature value. It can be understood that there is a certain correspondence between the discharge depth and the temperature range. When the battery 23 is in different temperature ranges, the discharge depths are also correspondingly different. When the temperature range is determined, the discharge depth is also correspondingly determined. For example, when the temperature range is 15° C. to 45° C., the discharge depth is 95%. When the temperature range is -20°C to -10°C, the discharge depth is 70%.
- the corresponding relationship between the discharge depth and the temperature range may be determined according to the design requirements of the battery 23 .
- the discharge depths of the battery 23 at different temperature ranges may be preset.
- the remaining capacity ratio Q of the battery 23 there is a certain correspondence between the remaining capacity ratio Q of the battery 23 and the open circuit voltage U.
- the value of the remaining capacity ratio Q is also correspondingly determined. For example, when the open circuit voltage U is 3.6V, the remaining capacity ratio Q is 100%. When the open circuit voltage U is 3.3V, the remaining capacity ratio Q is 80%.
- the remaining capacity ratio Q refers to the percentage of the remaining capacity of the battery 23 to the rated capacity. It can be understood that, in the embodiment of the present application, the sum of the value of the remaining capacity ratio Q of the battery 23 and the value of the discharge capacity ratio is 100%.
- the corresponding relationship between the remaining capacity ratio Q and the open circuit voltage U can be determined according to the design requirements of the battery 23 .
- the corresponding relationship between the remaining capacity ratio Q and the open circuit voltage U can be preset.
- the corresponding relationship between the remaining capacity ratio Q and the open circuit voltage U is a positive correlation.
- the battery device 20 determines the first remaining capacity ratio Q 1 corresponding to the first voltage value U 1 according to the parameter correspondence of the battery 23 .
- the corresponding parameter relationship refers to the corresponding relationship between the remaining capacity ratio Q and the open circuit voltage U.
- the first voltage value U 1 , the second voltage value U 2 , the third voltage value U 3 and the fourth voltage value U 4 described below are the open circuit voltage values of the battery 23 .
- the battery discharge and undervoltage protection method may further include the following steps:
- the full charge capacity means that the state of charge (State of Charge, SOC) of the battery 23 is 100%.
- the battery device 20 can charge the battery 23 in a constant-current charging (Constant-Current Charging, CC) method, or can use a constant-voltage charging (Constant-Voltage Charging, CV) method to charge the battery 23.
- the battery 23 is charged, or the battery 23 is charged in a constant current constant voltage (CC-CV) manner. It can be understood that the present application does not limit the charging method of the battery 23 .
- the battery device 20 collects the voltage value of the battery 23 , the voltage value is the full charge voltage value.
- a preset charging rate for example, 0.05C
- the discharge cut-off voltage refers to a voltage at which the battery 23 stops discharging to prevent the battery 23 from being over-discharged.
- the discharge cut-off voltage can be determined according to the design requirements of the battery 23 .
- the preset discharge cut-off voltage is 2.8V.
- the preset discharge cut-off voltage is 2.1V.
- the battery device 20 can discharge the battery 23 at a preset discharge rate (for example, 0.3C, 0.5C or 1.0C, etc.). It can be understood that the present application does not limit the value of the preset discharge rate.
- a preset discharge rate for example, 0.3C, 0.5C or 1.0C, etc.
- the battery device 20 can collect the voltage value of the battery 23 and the state of charge (SOC) corresponding to the voltage value in real time through the battery management system. ).
- the value of the state of charge (SOC) is equal to the value of the remaining capacity ratio Q.
- S45 Determine the parameter correspondence of the battery 23 according to the voltage value and the state of charge (SOC) corresponding to the voltage value.
- the parameter correspondence refers to the correspondence between the remaining capacity ratio Q and the open circuit voltage U.
- the battery device 20 can fit the open circuit voltage and charge of the battery 23 according to the voltage value of the battery 23 during the discharge process and the state of charge (SOC) corresponding to the voltage value.
- SOC state of charge
- the characteristic curve of the open circuit voltage U and the remaining capacity ratio Q of the battery 23 (that is, the corresponding relationship of the parameters) is the same as the characteristic curve of the open circuit voltage and the state of charge (OCV-SOC).
- steps S41-S45 are specific steps in an embodiment of obtaining the corresponding relationship of the parameters of the battery 23 .
- the first undervoltage threshold U0 is a preset undervoltage threshold (such as 2.8V, 2.9V or 3.0V, etc.)
- the second undervoltage threshold Ue is a dynamically adjusted undervoltage threshold voltage threshold (such as 2.1V, 2.2V or 2.4V, etc.).
- step S34 may include the following sub-steps:
- the battery device 20 may determine the second remaining capacity ratio Q 2 of the battery 23 according to the first remaining capacity ratio Q 1 and the discharge depth.
- step S341 may include the following sub-steps:
- the sum of the first remaining capacity ratio Q1 and the first discharge capacity ratio is 100%.
- the first discharge capacity ratio can be calculated as (100%-Q 1 ).
- the first discharge capacity ratio is less than the discharge depth (i.e. 100%-Q 1 ⁇ DOD x )
- the current temperature value makes the discharge capacity ratio of the battery 23 decrease
- the second remaining capacity ratio Q 2 100%-DOD x .
- it is necessary to reduce the first undervoltage threshold U 0 that is, adjust the first undervoltage threshold U 0 to the second undervoltage threshold U e , so as to increase the discharge capacity ratio of the battery 23 .
- the first discharge capacity ratio Q1 of the battery 23 decreases compared with the preset depth of discharge DODx . That is to say, the battery 23 loses a part of the discharge capacity ratio at low temperature, that is, DOD x ⁇ (100% ⁇ Q 1 ). To increase the discharge capacity ratio of the battery 23 at low temperature, it is necessary to reduce the first undervoltage threshold U0 to compensate for the discharge capacity ratio lost by the battery 23 at low temperature.
- the battery 23 can discharge more capacity.
- the battery device 20 may determine the second voltage value U 2 corresponding to the second remaining capacity ratio Q 2 according to the parameter correspondence of the battery 23 .
- the first discharge capacity ratio is smaller than the discharge depth (ie 100%-Q 1 ⁇ DOD x )
- the first remaining capacity ratio Q 1 is greater than the second remaining capacity ratio Q 2 (ie Q 1 >Q 2 ).
- the first voltage value U 1 is greater than the second voltage value U 2 (ie U 1 >U 2 ).
- the variation of the voltage value of the battery 23 ⁇ U U 1 ⁇ U 2 . It can be understood that the variation ⁇ U of the voltage value is caused by the low temperature of the battery 23 .
- the second under-voltage threshold U e U 0 - ⁇ U.
- FIG. 7 is a flow chart of a battery discharge undervoltage protection method in an embodiment. Assuming that the discharge rate is 0.3C, the temperature of the battery 23 is -10°C, the first voltage is 3.25V, and the preset first undervoltage threshold is 2.8V.
- the battery discharge undervoltage protection method includes the following steps:
- the discharge depth corresponding to the temperature range -10° C. to 0° C. is 80%.
- the corresponding relationship between the open circuit voltage and the remaining capacity ratio is a positive correlation. According to the preset characteristic curve of the open circuit voltage and the remaining capacity ratio, it can be determined that the first remaining capacity ratio corresponding to the first voltage value of 3.25V is 30%.
- the sum of the first remaining capacity ratio and the first discharge capacity ratio is 100%.
- the discharge capacity ratio of the battery 23 decreases at low temperature.
- the discharge capacity ratio of the battery 23 is reduced by 10% at a low temperature of -10°C.
- the sum of the depth of discharge and the second remaining capacity ratio is 100%.
- the second voltage value corresponding to the second remaining capacity ratio of 20% is 3.15V.
- the second undervoltage threshold is calculated to be 2.7V.
- the capacity ratio of the battery 23 that can continue to discharge is 10%, and the battery 23 can be compensated at -10
- the discharge capacity loss ratio at low temperature is 10%.
- steps S71-S78 are specific steps in an embodiment of determining the undervoltage threshold that the battery 23 needs to adjust at a low temperature of -10°C.
- Each parameter value in the above steps S71-S78 is an exemplary value. That is to say, in other scenarios, with different preset parameter values, the parameter values measured by the battery device 20 and the calculated parameter values will also be correspondingly different. In other implementation manners, determining the dynamically adjusted under-voltage threshold may depend on specific application scenarios.
- FIG. 8 shows the open circuit voltage curves of the battery 23 under different working conditions.
- the working state includes a resting state, a charging state and a discharging state.
- the full charging voltage and the charging cut-off voltage can be determined.
- the discharge cut-off voltage can be determined according to the open circuit voltage curve of the battery 23 in the discharge state, and the discharge cut-off voltage is the first undervoltage threshold U 0 or the second undervoltage threshold U e . From the open-circuit voltage curve of the battery 23 at rest, it can be seen that the depth of discharge of the battery 23 changes from the full charge voltage to the full discharge.
- the battery device 20 can preset the second undervoltage threshold U e in different temperature ranges, so as to select different undervoltage thresholds in different temperature ranges, so as to realize the adjustment of the undervoltage threshold dynamic adjustment.
- Table 2 shows the ratio of the undervoltage threshold to the discharge capacity of the battery 23 at different temperature ranges.
- the battery 23 is charged at the same temperature (eg 25° C.) with the same charge rate (eg 0.3 C). Then, the battery 23 is discharged at the same discharge rate (for example, 0.3C) and at different temperatures until the voltage of the battery 23 reaches the discharge cut-off voltage.
- Divide temperature ranges for example, the first temperature range is 15°C to 45°C, the second temperature range is 0°C to 15°C, the third temperature range is -10°C to 0°C, and the fourth temperature range is -20°C to - 10°C.
- the battery The discharge capacity ratio of the battery 23 is increased from 30% to 70%, which greatly improves the discharge performance of the battery 23 at low temperature.
- the battery discharge and undervoltage protection method may further include the following steps:
- the battery device 20 may collect the third voltage value U 3 through the battery management system. After the battery 23 is cut off for discharge, there are the following two situations:
- the third voltage value U 3 of the battery 23 is greater than the second undervoltage threshold U e (that is, U 3 >U e ), that is, the third voltage value U 3 has not reached the discharge cut-off voltage (that is, the The second undervoltage threshold U e ). At this time, the battery 23 can continue to discharge, and of course there is no need to perform undervoltage protection on the battery 23 .
- step S35 will be described below with a specific application scenario.
- the adjusted second undervoltage threshold is determined to be 2.2V, that is, the discharge cut-off voltage is 2.2V.
- the third voltage value collected by the battery management system is 2.3V
- the third voltage value of 2.3V is greater than the discharge cut-off voltage of 2.2V, indicating that the voltage of the battery 23 has not yet reached the discharge threshold.
- the cut-off voltage is 2.2V
- the battery 23 can continue to discharge, that is, no undervoltage protection is required for the battery 23 .
- the third voltage value collected by the battery management system is 2.2V
- the third voltage value of 2.2V is equal to the discharge cut-off voltage of 2.2V
- the capacity of the battery 23 may be irreversibly lost .
- the third voltage value U3 changes dynamically, and the third voltage value U3 does not become stable until after a period of time.
- the third voltage value U3 becoming stable means that the rate of change of the third voltage value U3 approaches zero within a preset time period.
- the third voltage value U 3 that tends to be stable is defined as the fourth voltage value U 4 .
- the fourth voltage value U 4 is greater than the second undervoltage threshold U e (that is, U 4 >U e ), the battery 23 continues to be discharged. If the fourth voltage value U 4 is smaller than the second undervoltage threshold U e (that is, U 4 ⁇ U e ), it is determined to perform undervoltage protection on the battery 23 .
- FIG. 9 shows the open circuit voltage curves of the battery 23 at different temperatures after discharge.
- S91 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 45°C.
- S92 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 25°C.
- S93 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 15°C.
- S94 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at 0°C.
- S95 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at -10°C.
- S96 is the curve of the discharge rate at 0.3C and the ratio of voltage to discharge capacity at -20°C.
- the dotted line part shows a rebound tendency of the voltage.
- the battery 23 is discharged at the same discharge rate (for example, 0.3C) and at different temperatures. Hence, under the same discharge rate, different temperature values correspond to different second undervoltage thresholds U e . As the temperature decreases, the second under-voltage threshold U e will decrease accordingly. When the temperature changes, the second under-voltage threshold U e needs to be dynamically adjusted.
- the battery device 20 can automatically adjust the second under-voltage threshold U e through the battery management system. For example, when the temperature value drops from -10°C to -20°C, the battery management system adjusts the second undervoltage threshold U e from 2.2V to 2.1V accordingly.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
Description
Claims (11)
- 一种电池放电欠压保护方法,其特征在于,所述方法包括:获取电池的温度值和第一电压值;根据所述温度值,确定所述电池的放电深度;根据所述第一电压值,确定所述电池的第一剩余容量比;根据所述第一剩余容量比、所述放电深度及第一欠压阈值,确定第二欠压阈值,以增大所述电池的放电容量比;其中,所述第一欠压阈值为预设欠压阈值,所述第二欠压阈值为动态调节后的欠压阈值。
- 如权利要求1所述的电池放电欠压保护方法,其特征在于,所述根据所述温度值,确定所述电池的放电深度,包括:确定所述温度值对应的温度区间;根据所述温度区间,确定所述温度区间对应的所述放电深度。
- 如权利要求1所述的电池放电欠压保护方法,其特征在于,所述根据所述第一电压值,确定所述电池的第一剩余容量比,包括:根据所述电池的参数对应关系,确定所述第一电压值对应的所述第一剩余容量比;其中,所述参数对应关系是指剩余容量比与开路电压的对应关系。
- 如权利要求3所述的电池放电欠压保护方法,其特征在于,所述根据所述第一剩余容量比、所述放电深度及第一欠压阈值,确定第二欠压阈值,包括:根据所述第一剩余容量比和所述放电深度,确定所述电池的第二剩余容量比;根据所述参数对应关系,确定所述第二剩余容量比对应的第二电压值;根据所述第二电压值和所述第一电压值,确定所述电池的电压值的变化量;根据所述电压值的变化量和所述第一欠压阈值,确定所述第二欠压阈值。
- 如权利要求1至4任一项所述的电池放电欠压保护方法,其特征在于,在所述根据所述第一剩余容量比、所述放电深度及第一欠压阈值,确定第二欠压阈值之后,所述方法还包括:获取所述电池在截止放电后的第三电压值;根据所述第二欠压阈值和所述第三电压值,确定是否对所述电池进行欠压保护。
- 如权利要求5所述的电池放电欠压保护方法,其特征在于,所述根据所述第二欠压阈值和所述第三电压值,确定是否对所述电池进行欠压保护,包括:根据所述第三电压值,确定第四电压值;若所述第四电压值小于所述第二欠压阈值,则确定对所述电池进行欠压保护。
- 如权利要求3所述的电池放电欠压保护方法,其特征在于,在所述根据所述电池的参数对应关系,确定所述第一电压值对应的所述第一剩余容量比之前,所述方法还包括:对所述电池进行充电,直至所述电池的容量达到满充容量;获取所述满充容量对应的满充电压;对所述电池进行放电,直至所述电池的电压达到放电截止电压;获取所述电池在放电过程中的电压值和所述电压值对应的荷电状态;根据所述电压值和所述电压值对应的荷电状态,确定所述参数对应关系。
- 如权利要求4所述的电池放电欠压保护方法,其特征在于,所述根据所述第一剩余容量比和所述放电深度,确定所述电池的第二剩余容量比,包括:根据所述第一剩余容量比,确定所述电池的第一放电容量比;根据所述第一放电容量比和所述放电深度,确定所述第二剩余容量比。
- 一种电池装置,其特征在于,所述电池装置包括电池、处理器及存储器,所述存储器中存储有计算机程序,当所述计算机程序被所述处理器执行时,实现如权利要求1至8任一项所述的电池放电欠压保护方法。
- 一种用电装置,其特征在于,所述用电装置包括负载及如权利要求9所述的电池装置,所述电池装置用于为所述负载提供电能。
- 如权利要求10所述的用电装置,其特征在于,所述用电装置包括无人机、电动车、电动工具及储能产品中的任一种。
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PCT/CN2021/095187 WO2022241766A1 (zh) | 2021-05-21 | 2021-05-21 | 电池放电欠压保护方法、电池装置及用电装置 |
JP2021540790A JP2023531569A (ja) | 2021-05-21 | 2021-05-21 | 電池放電のアンダー電圧保護方法、電池装置及び電気機器 |
EP21940219.5A EP4344012A1 (en) | 2021-05-21 | 2021-05-21 | Battery discharge under-voltage protection method, battery device, and power device |
US18/512,128 US20240085483A1 (en) | 2021-05-21 | 2023-11-17 | Battery discharge undervoltage protection method, battery apparatus, and electric apparatus |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2000100290A (ja) * | 1998-09-26 | 2000-04-07 | Uchihashi Estec Co Ltd | 回路の保護方法及び抵抗体付き温度ヒュ−ズ |
CN108279385A (zh) * | 2018-01-26 | 2018-07-13 | 深圳市道通智能航空技术有限公司 | 电池的电量状态估算方法、装置及电子设备 |
CN111913111A (zh) * | 2020-07-24 | 2020-11-10 | 蜂巢能源科技有限公司 | 放电功率校正方法、装置、存储介质及电子设备 |
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- 2021-05-21 EP EP21940219.5A patent/EP4344012A1/en active Pending
- 2021-05-21 WO PCT/CN2021/095187 patent/WO2022241766A1/zh active Application Filing
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000100290A (ja) * | 1998-09-26 | 2000-04-07 | Uchihashi Estec Co Ltd | 回路の保護方法及び抵抗体付き温度ヒュ−ズ |
CN108279385A (zh) * | 2018-01-26 | 2018-07-13 | 深圳市道通智能航空技术有限公司 | 电池的电量状态估算方法、装置及电子设备 |
CN111913111A (zh) * | 2020-07-24 | 2020-11-10 | 蜂巢能源科技有限公司 | 放电功率校正方法、装置、存储介质及电子设备 |
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