CN112994189A - Method and device for adjusting battery charging current in real time based on ambient temperature - Google Patents

Method and device for adjusting battery charging current in real time based on ambient temperature Download PDF

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Publication number
CN112994189A
CN112994189A CN202110462764.2A CN202110462764A CN112994189A CN 112994189 A CN112994189 A CN 112994189A CN 202110462764 A CN202110462764 A CN 202110462764A CN 112994189 A CN112994189 A CN 112994189A
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China
Prior art keywords
temperature
thermistor
battery
charging mode
environment
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Chinese (zh)
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魏波
王鑫
吴辉
付洪纲
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Chengdu Wanchuang Technology Co ltd
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Chengdu Wanchuang Technology Co ltd
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Priority to CN202110462764.2A priority Critical patent/CN112994189A/en
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the field of temperature sensing, and particularly discloses a method and a device for adjusting battery charging current in real time based on ambient temperature, wherein the method comprises the steps of collecting voltages at two ends of a thermistor according to sampling time intervals, simultaneously acquiring the current flowing through the thermistor, calculating the resistance value of the thermistor according to the voltages and the current, and obtaining the Kelvin temperature of the environment through a thermistor resistance value temperature relation function; the Kelvin temperature of the environment is converted into the centigrade temperature of the environment, the temperature range of the centigrade temperature of the environment is judged, and the corresponding charging mode is set according to the temperature range. The device comprises a power supply, a battery, a power supply management module, an acquisition control module and a temperature sensing module, wherein the temperature sensing module adopts a thermistor. By detecting the ambient temperature and monitoring the ambient temperature, the charging mode of the lithium battery is dynamically adjusted, so that the battery is protected in real time, the service life of the battery is longer, and the operation is safer.

Description

Method and device for adjusting battery charging current in real time based on ambient temperature
Technical Field
The invention relates to the field of temperature sensors, in particular to a method and a device for adjusting battery charging current in real time based on ambient temperature.
Background
The influence of ambient temperature on lithium batteries is very large. Chemical reactions on the battery electrode and the electrolyte are related to the ambient temperature, the charging speed of the battery is greatly reduced along with the reduction of the ambient temperature, and the lithium battery can be burnt at the moment when a power switch is turned on due to the excessively low ambient temperature below 0 ℃. While charging particularly quickly in an excessively high environment may reduce battery capacity. Generally, the performance of the battery material is degraded and the life is shortened after the temperature is higher than 45 ℃. For efficient charging, the ambient temperature is preferably kept between 5 and 30 ℃. At present, the battery charging strategy generally does not consider the influence of temperature on the battery, so that the battery is charged according to the inherent capacity of the battery, the battery is easy to damage, and the service life and the capacity of the battery are shortened.
Disclosure of Invention
The present invention is directed to overcome the above problems of the prior art, such as charging according to the inherent capacity of the battery, easy damage to the battery, and shortened life and capacity of the battery, and provides a method and apparatus for adjusting the charging current of the battery in real time based on the ambient temperature, which can effectively protect the battery, improve the service life and capacity of the battery.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for adjusting battery charging current in real time based on ambient temperature is characterized by comprising the following steps:
step S1, collecting the voltage at two ends of the thermistor according to the sampling time interval, simultaneously obtaining the current flowing through the thermistor, calculating the resistance value of the thermistor according to the voltage and the current, and obtaining the Kelvin temperature of the environment through the temperature relation function of the resistance value of the thermistor;
and step S2, converting the Kelvin temperature of the environment into the centigrade temperature t of the environment, judging the temperature interval of the centigrade temperature t of the environment, and setting a corresponding charging mode according to the temperature interval.
Further, the temperature intervals are divided into the following types:
when t is less than 0 ℃ or t is more than 45 ℃, the corresponding charging mode is a charging stopping mode;
when t is more than or equal to 0 ℃ and less than 5 ℃, the corresponding charging mode is a slow charging mode;
when t is more than 30 ℃ and less than or equal to 45 ℃, the corresponding charging mode is a slow charging mode;
and when t is more than or equal to 5 ℃ and less than or equal to 30 ℃, the corresponding charging mode is a quick charging mode.
Preferably, after the step S1 is executed circularly for the preset number of times to obtain the kelvin temperatures of the plurality of environments, the kelvin temperatures of the plurality of environments are averaged, and then the step S2 is executed on the average.
Preferably, the preset number of times is set to 6 times.
Further, the method for obtaining the current flowing through the thermistor includes the steps of pulling up the thermistor to a direct current voltage source through a pull-up resistor with a known resistance value, subtracting the voltage at two ends of the thermistor from the voltage of the direct current voltage source to obtain the voltage at two ends of the pull-up resistor, and dividing the voltage at two ends of the pull-up resistor by the resistance value of the pull-up resistor to obtain the current flowing through the pull-up resistor, namely the current flowing through the thermistor.
Further, the temperature relation function of the resistance value of the thermistor is as follows:
T1=1/(ln(Rt/R)/B+1/T2)，
wherein R istIs the resistance value of the thermistor, T1Temperature in Kelvin, T, for the environment to be solved2Is the normal temperature kelvin; r is thermistor at normal temperature T2Nominal resistance value of; b is the parameter B value of the thermistor.
Preferably, the sampling time interval is set to 500 milliseconds.
Based on the same conception of the invention, the invention also provides a device for adjusting the charging current of the battery in real time based on the ambient temperature, which comprises a power supply, the battery, a power supply management module, an acquisition control module and a thermistor, wherein the acquisition control module is connected with the thermistor and executes any one of the methods, and the charging mode of the power supply management module is set to charge the battery.
Preferably, the model of the chip adopted by the power management module is BQ 24725A.
Preferably, the acquisition control module adopts an embedded processor, and the model of the embedded processor is IT 8528E.
Compared with the prior art, the invention has the beneficial effects that: .
1. In the process of charging the lithium battery, the method dynamically adjusts the charging mode of the lithium battery by detecting the ambient temperature and monitoring the ambient temperature, so that the battery is protected in real time, the service life of the battery is longer, the operation is safer, and the user experience is better;
2. the method comprises the steps of continuously obtaining the ambient temperature for multiple times, averaging and then judging the corresponding charging mode, or the method comprises the steps of setting the preset lag time and writing the charging mode into the charging management module only after the preset lag time is overtime, so that the adverse effect on the battery caused by frequent switching of the charging current when the ambient temperature is unstable and the temperature changes violently is eliminated;
3. the acquisition control module uses an embedded controller, so that the problem of easy heating caused by common integrated ICs is solved, the influence on the ambient temperature is reduced, and the stability of lithium battery charging is facilitated.
Drawings
FIG. 1 is a flowchart of a method for adjusting a battery charging current in real time based on an ambient temperature in example 1;
FIG. 2 is a block diagram of an apparatus for adjusting a battery charging current in real time based on an ambient temperature according to embodiment 2;
fig. 3 is a schematic circuit diagram of an apparatus for adjusting a battery charging current in real time based on an ambient temperature in embodiment 3.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
A method for adjusting a battery charging current in real time based on an ambient temperature, as shown in fig. 1, specifically includes the following steps:
step S1, collecting the voltage at two ends of the thermistor according to the sampling time interval, simultaneously obtaining the current flowing through the thermistor, calculating the resistance value of the thermistor according to the voltage and the current, and obtaining the Kelvin temperature of the environment through the temperature relation function of the resistance value of the thermistor;
wherein, the voltage of the thermistor is collected, and the voltage value at the two ends of the thermistor R8 is sampled at a preset time interval of 500 milliseconds by an ADC, i.e., an ADC0 interface of the collection control module U2 in fig. 3, to obtain a sampling voltage V;
the method for obtaining the current flowing through the thermistor R8 includes the steps of pulling up the thermistor R8 to a direct-current voltage source Vref _3V3 through a pull-up resistor R16 with a known resistance value of 10K Ω, subtracting the voltage V at two ends of the thermistor from the voltage 3.3V of the direct-current voltage source to obtain the voltage at two ends of the pull-up resistor, and dividing the voltage at two ends of the pull-up resistor R16 by the resistance value of the pull-up resistor R16 to obtain the current flowing through the pull-up resistor R16, namely the current flowing through the thermistor R8.
By the formula Rt=V×R0/(V0V) calculating the resistance R of the thermistor R8t.
Collecting the resistance value R of the thermistor R8 according to the temperature relation function of the resistance value of the thermistortAnd bringing the thermistor resistance value temperature relation function into the function, wherein the thermistor resistance value temperature relation function is as follows:
T1=1/(ln(Rt/R)/B+1/T2)，
wherein R istIs the resistance value of the thermistor, T1Temperature in Kelvin, T, for the environment to be solved2Is the normal temperature kelvin; r is thermistor at normal temperature T2Nominal resistance value, normal temperature, Kelvin temperature T2At 273.15+25, in the embodiment, the thermistor R8 is selected to be 10K omega, and the resistance value is called to be 10K omega at 25 ℃, namely R is equal to 10K omega; b is the parameter B value of the thermistor, and the value of B is 3950;
the thermistor resistance temperature relation function can be deduced from a thermistor temperature calculation formula, wherein the thermistor temperature calculation formula is as follows:
Rt=R×EXP(B×(1/T1-1/T2))
wherein EXP means n power of e;
step S2, temperature of environment in Kelvin T1Convert the temperature t of environment into, judge the temperature interval at the temperature t place of environment, set up corresponding charge mode according to the temperature interval place, the temperature interval divide into as follows several:
when t is less than 0 ℃ or t is more than 45 ℃, the corresponding charging mode is a charging stopping mode;
when t is more than or equal to 0 ℃ and less than 5 ℃, the corresponding charging mode is a slow charging mode;
when t is more than 30 ℃ and less than or equal to 45 ℃, the corresponding charging mode is a slow charging mode;
and when t is more than or equal to 5 ℃ and less than or equal to 30 ℃, the corresponding charging mode is a quick charging mode.
In order to prevent adverse effects on the battery caused by frequent switching of charging current when the environmental temperature is unstable and the temperature changes violently, step S1 is executed circularly for a preset number of times, after the kelvin temperatures of a plurality of environments are obtained, the kelvin temperatures of the plurality of environments are averaged, and then step S2 is executed on the average value; in this embodiment, the preset number of times is set to 6.
Example 2
A device for adjusting the charging current of a battery in real time based on the ambient temperature is shown in figure 2 and comprises a power supply and the battery, and is characterized by also comprising a power supply management module, an acquisition control module and a thermistor,
the acquisition control module is connected with a thermistor, the resistance value of the thermistor changes according to the change of the environmental temperature, the acquisition control module executes the method in the embodiment 1, acquires the voltage at two ends of the thermistor, converts the voltage into the current environmental temperature, judges the corresponding charging mode according to the temperature interval of the environmental temperature, and sets the charging mode of the power management module to charge the battery.
Example 3
A device for adjusting battery charging current in real time based on ambient temperature is disclosed, wherein a schematic diagram of a specific circuit adopted in the embodiment is shown in FIG. 3, and a power supply is accessed by two pins, i.e. Adapter + and Adapter-; the battery is accessed by two pins, namely Pack + and Pack-; the temperature sensing module is a thermistor R8; the power management module U1 adopts a power management chip with model number BQ24725A, and the acquisition control module U2 adopts an embedded processor with model number IT 8528E;
the 1 st port of the power management module U1 is Adapter +, Adapter-, the 2 nd port is SDA and SDL, the power management module U1 is connected with the acquisition control module U2 through an SMBus bus, receives an instruction sent by the acquisition control module U2 to set a charging mode, and the 3 rd port is Pack +, Pack-connected with the battery charging module to provide charging current for the battery charging module; the power management module U1 also has a 4 th port for supplying power to the load of the device;
the thermistor R8 is pulled up to a constant direct current voltage Vref _3V3 through a pull-up resistor R16, the voltage value is 3.3V, and the resistance value of the pull-up resistor R16 is 10K omega; the resistance of the thermistor R8 changes according to the change of the ambient temperature, the acquisition control module U2 executes the method described in embodiment 1, acquires the voltage across the thermistor, converts the voltage into the current ambient temperature, determines the corresponding charging mode according to the temperature interval in which the ambient temperature is located, and sets the charging mode of the power management module for the battery charging module through the 2 nd ports SDA, SDL of the power management module U1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A method for adjusting battery charging current in real time based on ambient temperature is characterized by comprising the following steps:
step S1, collecting the voltage at two ends of the thermistor according to the sampling time interval, simultaneously obtaining the current flowing through the thermistor, calculating the resistance value of the thermistor according to the voltage and the current, and obtaining the Kelvin temperature of the environment through the temperature relation function of the resistance value of the thermistor;
and step S2, converting the Kelvin temperature of the environment into the centigrade temperature t of the environment, judging the temperature interval of the centigrade temperature t of the environment, and setting a corresponding charging mode according to the temperature interval.
2. The method according to claim 1, wherein the temperature interval is divided into the following ranges:
when t is less than 0 ℃ or t is more than 45 ℃, the corresponding charging mode is a charging stopping mode;
when t is more than or equal to 0 ℃ and less than 5 ℃, the corresponding charging mode is a slow charging mode;
when t is more than 30 ℃ and less than or equal to 45 ℃, the corresponding charging mode is a slow charging mode;
and when t is more than or equal to 5 ℃ and less than or equal to 30 ℃, the corresponding charging mode is a quick charging mode.
3. The method as claimed in claim 1, wherein the step S1 is performed for a predetermined number of cycles, the kelvin temperatures of the plurality of environments are obtained, the kelvin temperatures of the plurality of environments are averaged, and the step S2 is performed on the averaged value.
4. The method of claim 3, wherein the predetermined number of times is set to 6 times.
5. The method according to claim 1, wherein the current flowing through the thermistor is obtained by pulling up the thermistor to a dc voltage source through a pull-up resistor having a known resistance, subtracting a voltage across the thermistor from a voltage across the dc voltage source to obtain a voltage across the pull-up resistor, and dividing the pull-up resistor by the voltage across the pull-up resistor to obtain the current flowing through the pull-up resistor, i.e., the current flowing through the thermistor.
6. The method of claim 1, wherein the thermistor resistance temperature relationship function is:
T1=1/(ln(Rt/R)/B+1/T2)，
wherein R istIs the resistance value of the thermistor, T1Temperature in Kelvin, T, for the environment to be solved2Is the normal temperature kelvin; r is thermistor at normal temperature T2Nominal resistance value of; b is the parameter B value of the thermistor.
7. The method of claim 1, wherein the sampling time interval is set to 500 milliseconds.
8. A device for adjusting battery charging current in real time based on ambient temperature comprises a power supply and a battery, and is characterized by further comprising a power supply management module, an acquisition control module and a thermistor, wherein the acquisition control module is connected with the thermistor and executes the method of any one of claims 1 to 7, and the charging mode of the power supply management module is set to charge the battery.
9. The apparatus of claim 8, wherein the power management module is of a BQ24725A chip type.
10. The apparatus of claim 9, wherein the collection control module is an embedded processor of type IT 8528E.
CN202110462764.2A 2021-04-28 2021-04-28 Method and device for adjusting battery charging current in real time based on ambient temperature Pending CN112994189A (en)

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Publication number Priority date Publication date Assignee Title
CN1126899A (en) * 1994-08-29 1996-07-17 安德鲁公司 Battery charger for portable rechargeable batteries
CN102130476A (en) * 2010-01-18 2011-07-20 上海果壳电子有限公司 Electronic equipment quick-acting charging device based on dynamic switching and using method thereof
CN106394264A (en) * 2016-05-27 2017-02-15 奇瑞汽车股份有限公司 Method and device for quick charging of electric automobile
CN106654424A (en) * 2016-11-30 2017-05-10 努比亚技术有限公司 Charging method and terminal
CN206742928U (en) * 2017-04-12 2017-12-12 深圳市金欣辉电子科技有限公司 Charger baby automatically adjusts charge power charging circuit
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Application publication date: 20210618