CN114825522A - Method for charging battery - Google Patents
Method for charging battery Download PDFInfo
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- CN114825522A CN114825522A CN202210395317.4A CN202210395317A CN114825522A CN 114825522 A CN114825522 A CN 114825522A CN 202210395317 A CN202210395317 A CN 202210395317A CN 114825522 A CN114825522 A CN 114825522A
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- battery
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- 238000007600 charging Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004146 energy storage Methods 0.000 claims abstract description 28
- 238000010280 constant potential charging Methods 0.000 claims abstract description 11
- 238000007667 floating Methods 0.000 claims abstract description 10
- 238000010278 pulse charging Methods 0.000 claims abstract description 6
- 235000008429 bread Nutrition 0.000 claims description 8
- 238000004904 shortening Methods 0.000 abstract description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 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
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- 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
-
- 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
-
- 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
- H02J7/00308—Overvoltage 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- 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
- H02J7/00711—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process
-
- 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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
Landscapes
- 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 discloses a method for charging a battery, which charges the battery through a backup energy storage system, and comprises the steps of S0 and presetting; s1, charging is forbidden; s2, floating charging or pulse charging; s3, step constant voltage charging; s4, pre-charging; the method adopts three modes to charge the battery, and when the voltage or the capacity of the battery is particularly low, pre-charging is adopted; when the voltage of the battery is larger than a set value 1, starting stepping constant voltage charging, and when the current is very small or zero, continuing charging until the constant voltage value is larger than the current voltage of the battery by delta V, and repeating the steps until the voltage of the battery is larger than a set value n; then the floating charge or the pulse charge is started. So that the battery temperature does not rise too high and the rate of shortening the battery life is also reduced.
Description
Technical Field
The invention relates to a method for charging a battery, which is particularly suitable for a backup energy storage system.
Background
At present, along with the heat of the new energy industry is higher and higher, the popularity of the electric automobile is also higher and higher, and the energy storage equipment is more and more favored by people. The equipment with the energy storage module can be used in places without commercial power, and the constraint of the commercial power is temporarily eliminated. The most commonly used energy storage modules are mainly composed of lithium batteries, including ternary lithium batteries, lithium iron phosphate batteries, lithium titanate batteries, and the like. Furthermore, the battery energy storage module is widely applied to many fields, such as automobiles, data centers, portable devices and the like.
Aiming at the existing battery energy storage module, the charging speed and the charging temperature are always contradictory technical points. With the technology of the power supply industry becoming more mature, the power of the battery energy storage module becomes higher and higher, the condition restricting the battery charging is more inclined to the battery, and the lithium separation phenomenon can occur when the charging current is too large all the time, so that the service life of the battery is influenced.
Currently, the following strategies are generally used to charge the battery:
1. a three-section charging mode is adopted. As shown in fig. 1, when charging is started, the battery capacity is low and the battery voltage is also low, and the battery is charged by a constant current mode, that is, a fixed current; when the voltage of the battery reaches a set value one, a constant voltage mode is adopted, namely the battery is charged by a fixed voltage; and when the voltage of the battery reaches a second set value, the battery is charged by adopting the float charging voltage, namely, the battery is continuously charged in a constant voltage mode. However, in the early stage of the charging mode, the battery is always charged by using a constant current, so that the heat of the battery is increased quickly, and the danger is also caused by always adopting large-current charging.
2. A pulse charging form is adopted. As shown in fig. 2, the charging process is mainly divided into three important phases: pre-charging, namely using small current to enable the voltage or the capacity of the battery to rise to a first set value; charging in a constant current mode, wherein the charging current is charged at a constant value until the voltage or the battery capacity reaches a set value II; buffering, stopping charging when the voltage reaches a second set value, and charging in a constant current mode after the voltage recovers to a third set value; and the process is continuously circulated. However, although this charging form always uses the constant current mode for charging, it is certainly charged within the range of the current allowed by the cell. The positive premise is to ensure safety and stability.
In order to overcome the above technical defects, it is necessary to develop a new method for charging a battery.
Disclosure of Invention
In view of the above existing technical problems, the present invention provides a method for charging a battery, so as to effectively control the temperature of the battery and increase the service life of the battery.
In order to achieve the above object, the present invention provides a method for charging a battery, which charges the battery through a backup energy storage system, and comprises the following specific steps:
s0, presetting:
setting a threshold value of battery current, a set value 1, a set value 2, … … and a set value n of battery voltage, wherein n is an integer greater than or equal to 2, and the maximum value of the battery voltage is greater than the set value n is greater than … …, greater than the set value 2, greater than the set value 1 and greater than the minimum value of the battery voltage;
s1, charge forbidding:
judging whether the current battery voltage is greater than or equal to the maximum value of the battery voltage;
if yes, the battery charging is prohibited, and then the process goes to S1;
if not, go to S2;
s2, floating charge or pulse charge:
judging whether the current battery voltage is more than or equal to a set value n;
if yes, floating charging or pulse charging is carried out on the battery, and then S1 is carried out;
if not, go to S3;
s3, step constant-pressure charging:
judging whether the current battery voltage is more than or equal to a set value n-1;
a. if yes, the battery is subjected to stepping constant voltage charging according to a constant voltage value, wherein the constant voltage value is the battery voltage plus delta V, and the delta V is larger than 0; then judging whether the current battery voltage is greater than or equal to a constant voltage value and whether the current charging current is smaller than a current threshold value; if yes, updating the constant voltage value, continuing stepping constant voltage charging of the battery according to the new constant voltage value, and then entering S1; if not, go to S1;
b. if not, judging whether the current battery voltage is more than or equal to a set value n-2; if yes, repeating the step a; if not, judging whether the current battery voltage is more than or equal to a set value n-3; sequentially judging each set value until judging whether the current battery voltage is more than or equal to a set value 1; if yes, repeating the step a, otherwise, entering S4;
s4, pre-charging:
the battery is precharged and then proceeds to S1.
In the technical scheme, the battery is charged by the backup energy storage system by using commercial power, and the battery is charged in three stages:
1. when the voltage or the capacity of the battery is particularly low, the invention adopts a pre-charging small constant current mode to charge the battery;
2. when the voltage of the battery is more than or equal to the set value 1, the invention starts a stepping constant voltage charging mode, namely, the current battery voltage is measured, the constant voltage value is enabled to be larger than the current battery voltage by delta V, and the charging is carried out according to the constant voltage value; when the current is small or not, the constant voltage value is larger than the current battery voltage by delta V to continue charging, and the cycle is repeated until the battery voltage is larger than a set value n;
3. when the voltage of the battery is larger than or equal to the set value n, the invention starts a floating charge mode or a pulse charge mode to charge the battery.
Further, the backup energy storage system comprises a rectifier bridge, a PFC module, a DC/DC module, an energy storage module and an MCU module;
the rectifier bridge converts the input alternating current into steamed bread waves;
the PFC module converts the steamed bread waves into direct current of about 380V;
the DC/DC module converts the output voltage of the PFC module into the voltage required by the battery;
the MCU module is arranged in the DC/DC module and is used for controlling the charging method of the battery;
the input commercial power is 220V alternating current, and the load is a battery.
In the technical scheme, alternating current is converted into direct-current steamed bun wave signals by commercial power through the rectifier bridge, then the power factor of the system is corrected through the PFC module, the steamed bun wave signals are converted into direct-current signals of about 400V, finally, electric energy is converted into energy of a battery through the DC/DC module, and the DC/DC module directly controls the charging form of a power supply.
Furthermore, the MCU module adopts a DSP chip and comprises a PFC control function and an LLC control function.
Further, the rectifier bridge includes four diodes.
Furthermore, the PFC module comprises two MOS tubes.
Furthermore, the DC/DC module comprises four MOS tubes.
In summary, compared with the prior art, the method of the invention has the following technical advantages:
1. the battery is charged in three stages, so that the battery charging system is flexible, efficient, safe and stable;
2. the battery has rest time after being charged by large current, so that the temperature of the battery cannot rise too high;
3. so that the lithium separation phenomenon has the opportunity to be reversible, the metal lithium is converted into lithium ions, and the shortening speed of the service life of the battery is reduced.
Drawings
FIG. 1 is a schematic diagram of a charging curve of a battery in a three-stage charging manner according to the prior art;
FIG. 2 is a schematic diagram of a prior art charging curve of a battery using a pulse charging mode;
FIG. 3a is a schematic block diagram of a prior art backup energy storage system;
fig. 3b is an electrical schematic diagram of a backup energy storage in the prior art, which uses commercial power to charge an energy storage module;
FIG. 3c shows an embodiment of a circuit for charging a battery according to the present invention;
FIG. 4a is a flowchart of a charging method using a set value 2 as a final charging voltage;
FIG. 4b is a flow chart of a method for charging the battery by the circuit shown in FIG. 3 c;
FIG. 5 is a schematic diagram of a charging curve for charging a battery according to the present invention.
Detailed Description
The specific structural and functional details of the embodiments of the present invention disclosed herein are merely illustrative of the embodiments of the present invention. The present invention may be embodied in many different forms without departing from its spirit or essential characteristics. Accordingly, the disclosed embodiments of the invention are provided for illustrative purposes only and should not be construed as limiting the invention.
First, as shown in fig. 3a, the present invention uses a backup energy storage system, also called a portable power device, a portable energy storage system, etc., as a circuit for charging a battery, wherein the backup energy storage system includes an energy storage module, a DC/DC module, a DC/AC module, a DC interface module, an AC interface module, and other modules. The energy storage module can be a battery or other energy storage equipment; the DC/DC module is a topological structure for converting direct current into direct current, such as BUCK, BOOST, LLC, forward excitation, flyback and the like; the DC/AC module is a direct current-to-alternating current or alternating current-to-direct current module, such as full-wave rectification, half-wave rectification, push-pull, PFC and the like; the DC interface module refers to a mode for accessing a direct current device or a direct current source, such as a direct current socket, a USB interface, a cigarette lighter, and the like; the AC interface module is a mode for accessing an AC device or an AC source, such as a two-pin socket, a triangular socket, etc.; the other modules include the rest modules such as display, sound and keys.
As shown in fig. 3b, the backup energy storage system charges the energy storage module by using the commercial power, the commercial power converts the alternating current into a direct current steamed bread wave signal through the rectifier bridge, then corrects the power factor of the system through the PFC module, converts the steamed bread wave signal into a direct current signal of about 400V, and finally converts the electric energy into the energy of the energy storage module through the DC/DC module, that is, the charging form of the battery is directly controlled by the DC/DC module.
In practice, the present invention may be implemented using conventional circuitry of a backup energy storage system to charge the battery, as shown in fig. 3 c. The input commercial power of the circuit is 220V alternating current, and the load is a battery; the MCU module is arranged in the DC/DC module and is used for controlling a charging method of a battery, the charging method comprises a PFC control function and an LLC control function, and a DSP chip is generally selected, for example tms320F 280049; the rectifier bridge converts the input alternating current into steamed bread waves; the PFC module converts the steamed bread waves into direct current of about 380V; the DC/DC module converts the output voltage of the PFC module to a voltage required by the battery. The rectifier bridge comprises four diodes, and alternating current is converted into direct current by utilizing the unidirectional conduction property of the diodes; the PFC module comprises two MOS tubes, the phases of current and voltage are adjusted to be consistent by controlling the on and off of the MOS tubes Q1 and Q2, and the output voltage of the PFC module is controlled to be direct current of about 380V; the DC/DC module comprises four MOS tubes, and the output of the PFC module is converted into voltage capable of charging the battery through controlling the four MOS tubes.
Next, as shown in fig. 5, the method of the present invention presets a current threshold, a set value 1, a set value 2, … …, and a set value n of the battery voltage, where n is a positive integer greater than or equal to 2, and charges the battery in three stages:
the first stage is as follows: when the voltage or the capacity of the battery is particularly low, the battery is charged by adopting a pre-charging small constant current mode.
And a second stage: when the battery voltage reaches a set value 1, a stepping constant voltage charging mode is adopted, namely the current battery voltage is measured, the constant voltage value is enabled to be larger than the current battery voltage by delta V, and the battery is charged by the constant voltage value; and when the current is small or not, the constant voltage value is enabled to be larger than the current battery voltage by delta V to continuously charge the battery, and the steps are repeated in a circulating mode until the battery voltage reaches a set value n.
And a third stage: and when the battery voltage reaches a set value n, the battery mode enters a floating charge or pulse charge mode.
As shown in fig. 4a, in detail, the method for charging the battery of the present invention comprises the following steps:
and S0, presetting a current threshold of the battery, a set value 1 and a set value 2 of the battery voltage, wherein the maximum value of the battery voltage is larger than the set value 2, the set value 1 is larger than the minimum value of the battery voltage, and charging the battery by taking the set value 2 as the final charging voltage.
S1, judging whether the current battery voltage is larger than or equal to the maximum value of the battery voltage;
if so, prohibiting charging the battery, and then proceeding to S1;
if not, the process proceeds to S2.
S2, judging whether the current battery voltage is larger than or equal to a set value 2;
if yes, floating charging or pulse charging is carried out on the battery;
if not, the process proceeds to S3.
S3, judging whether the battery voltage is larger than or equal to a set value 1;
a. if yes, performing step-by-step constant voltage charging on the battery, namely measuring the current battery voltage, setting a constant voltage value to be larger than the current battery voltage by delta V, wherein delta V is larger than 0, and performing constant voltage charging on the battery according to the constant voltage value;
then, judging whether the current battery voltage is greater than or equal to a constant voltage value 1 and whether the current battery current is smaller than a current threshold value; if yes, updating the constant voltage value, setting the constant voltage value to be larger than the current battery voltage by delta V, and then entering S1;
b. if not, the process proceeds to S4.
And if the number of the set values of the battery voltage is more than 2, sequentially judging whether the current battery voltage is larger than the set value according to the sequence from large to small of the set value, if so, repeating the step a, and if not, then judging the next set value until the set value is 1.
S4, the battery is precharged, and then the process proceeds to S1.
As shown in fig. 4b, in practice, the method of the present invention for charging a battery using the circuit shown in fig. 3c comprises the following specific steps:
a0, if the battery core selects a ternary lithium battery (2.5V-4.2V, 3000mah capacity), a battery pack assembly mode of 14 series-2 parallel batteries is adopted, the voltage range of the batteries is 35V-58.8V, the minimum value of the battery voltage is 35V, and the maximum value of the battery voltage is 58.8V; the preset battery voltage setting value n is 56V and … …, the setting value 2 is 42V, and the setting value 1 is 40V.
A1, judging whether the battery voltage is larger than or equal to the maximum value 58.1V of the battery voltage;
if yes, charging is prohibited, and then return to A1;
if not, go to A2.
A2, charging the battery in a floating charge or pulse charge mode:
judging whether the battery voltage is greater than or equal to 56V;
if yes, charging the battery in a double-ring competition mode, wherein the constant current value is 6A, the constant voltage value is 58V, and then returning to A1;
if not, go to A3.
A3, charging the battery in a stepping constant-voltage charging mode:
judging whether the battery voltage is greater than or equal to 42V;
a. if yes, charging the battery in a double-ring competition mode, wherein the constant current value is 6A, and the constant voltage value is 44V;
then, judging whether the charging current is less than 1A; if yes, charging the battery in a double-ring competition mode, wherein the constant current value is 6A, the constant voltage value is 46V, and then returning to A1; if not, return to A1.
b. If not, judging whether the battery voltage is more than or equal to 40V;
if yes, charging the battery in a double-ring competition mode, wherein the constant current value is 6A, and the constant voltage value is 42V; then judging whether the charging current is less than 1A; if yes, charging the battery in a double-ring competition mode, wherein the constant current value is 6A, the constant voltage value is 44V, and then returning to A1; if not, return to A1.
If not, go to A4.
Further, a plurality of set values of the battery voltage can be inserted between the set values 56V and 42V, and similarly, the steps a and b are repeated.
A4, charging the battery in a pre-charging mode:
charging the battery in a double-ring competition mode, wherein the constant current value is 2A, and the constant voltage value is 40V; and then returns to a 1.
As shown in fig. 4b and fig. 5, it can be known from the above that when the voltage of the battery is less than 40V, the method of the present invention uses 2A of current to pre-charge the battery at a constant voltage; when the voltage of the battery is more than 40V and less than 58V, the method adopts a step constant voltage mode to charge the battery, namely when the voltage is 40V, the constant voltage value is set to be 42V, and the constant current value is set to be 6A; when the voltage of the battery does not reach 42V, the battery is charged with a constant current of 6A all the time; when the battery voltage rises to 42V, the battery is charged with a constant voltage of 42V, the charging current is gradually reduced, when the current is reduced to 1A, the constant voltage value is set to 44V, and the charging mode is changed into 6A constant current to charge the battery … …, and the steps are repeated until the battery voltage reaches the full-battery voltage. The charging method is a new charging method, effectively controls the temperature of the battery, prolongs the service life of the battery, and is flexible, efficient, safe and stable.
Although the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (6)
1. A method for charging a battery is characterized in that the battery is charged through a backup energy storage system, and the method comprises the following specific steps:
s0, presetting:
setting a threshold value of battery current, a set value 1, a set value 2, … … and a set value n of battery voltage, wherein n is an integer greater than or equal to 2, and the maximum value of the battery voltage is greater than the set value n is greater than … …, greater than the set value 2, greater than the set value 1 and greater than the minimum value of the battery voltage;
s1, charge forbidding:
judging whether the current battery voltage is greater than or equal to the maximum value of the battery voltage;
if yes, the battery charging is prohibited, and then the process goes to S1;
if not, go to S2;
s2, floating charge or pulse charge:
judging whether the current battery voltage is more than or equal to a set value n;
if yes, floating charging or pulse charging is carried out on the battery, and then S1 is carried out;
if not, go to S3;
s3, step constant-pressure charging:
judging whether the current battery voltage is more than or equal to a set value n-1;
a. if yes, the battery is subjected to stepping constant voltage charging according to a constant voltage value, wherein the constant voltage value is the battery voltage plus delta V, and the delta V is larger than 0; then judging whether the current battery voltage is greater than or equal to a constant voltage value and whether the current charging current is smaller than a current threshold value; if yes, updating the constant voltage value, continuing stepping constant voltage charging of the battery according to the new constant voltage value, and then entering S1; if not, go to S1;
b. if not, judging whether the current battery voltage is more than or equal to a set value n-2; if yes, repeating the step a; if not, judging whether the current battery voltage is more than or equal to a set value n-3; sequentially judging each set value until judging whether the current battery voltage is more than or equal to a set value 1; if yes, repeating the step a, otherwise, entering S4;
s4, pre-charging:
the battery is precharged and then proceeds to S1.
2. The method of claim 1, wherein the backup energy storage system comprises a rectifier bridge, a PFC module, a DC/DC module, an energy storage module, and an MCU module;
the rectifier bridge converts the input alternating current into steamed bread waves;
the PFC module converts the steamed bread waves into direct current of about 380V;
the DC/DC module converts the output voltage of the PFC module into the voltage required by the battery;
the MCU module is arranged in the DC/DC module and is used for controlling the charging method of the battery;
the input commercial power is 220V alternating current, and the load is a battery.
3. The method according to claim 2, wherein the MCU module employs a DSP chip including a PFC control function and an LLC control function.
4. A method of charging a battery as claimed in claim 2, wherein the rectifier bridge comprises four diodes.
5. The method of claim 2 wherein the PFC module comprises two MOS transistors.
6. The method of claim 2, wherein the DC/DC module comprises four MOS transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210395317.4A CN114825522A (en) | 2022-04-14 | 2022-04-14 | Method for charging battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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