CN111864859A - System and method for prolonging service life of lithium battery pack with constant-current and constant-voltage charging and discharging - Google Patents
System and method for prolonging service life of lithium battery pack with constant-current and constant-voltage charging and discharging Download PDFInfo
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- CN111864859A CN111864859A CN202010807536.XA CN202010807536A CN111864859A CN 111864859 A CN111864859 A CN 111864859A CN 202010807536 A CN202010807536 A CN 202010807536A CN 111864859 A CN111864859 A CN 111864859A
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- 238000007599 discharging Methods 0.000 title claims abstract description 65
- 238000010280 constant potential charging Methods 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 33
- 238000010277 constant-current charging Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007600 charging Methods 0.000 claims abstract description 28
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000019771 cognition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013589 supplement Substances 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
-
- 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
-
- 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
Abstract
The invention provides a system and a method for prolonging the service life of a lithium battery pack with constant-current and constant-voltage charging and discharging. The lithium battery pack service life prolonging system comprises a controller, a voltage acquisition module, a switching module for switching to an Nth battery cell of the lithium battery pack and balancing the Nth battery cell, a power module and a constant-current and constant-voltage charge-discharge module for constant-current and constant-voltage charge-discharge of the Nth battery cell, wherein N is a positive integer, the voltage acquisition module is used for respectively acquiring the voltage of each battery cell of the lithium battery pack, the output end of the voltage acquisition module is connected with the controller, the power module is controlled to be connected with the controller, one end of the power module is connected with the output end of the constant-current and constant-voltage charge-discharge module, the other end of the power module is connected with the Nth battery cell, and the input end of the constant-current and constant. The invention has the advantages that the voltage does not fall back or fall back uniformly after the charging is finished, the voltage does not bounce back or bounce back slightly and uniformly after the discharging is finished, and the service life of the battery pack is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of battery packs, in particular to a system for prolonging the service life of a lithium battery pack with constant-current and constant-voltage charging and discharging functions, and further relates to a method for prolonging the service life of the system based on the lithium battery pack with the constant-current and constant-voltage charging and discharging functions.
Background
In the prior art, a plurality of batteries are combined together to form a battery pack, so as to meet the requirement of large current and voltage, but due to the following factors but not limited to:
1. lithium battery pack production pairing issues (including voltage, internal resistance, capacity);
2. the current protection plate has poor and satisfactory balancing effect and is extremely unsafe;
3. the battery pack protection board protects only for voltage.
Therefore, in order to prolong the service life of the battery pack, the battery pack must be subjected to equalization repair, and currently, the equalization methods are classified into the following three categories:
1. the charging is balanced, the internal voltage of the battery pack is fully charged, the ternary material is charged to 4.2V, and the lithium iron phosphate is charged to 3.65V, so that the method has low efficiency, the problem of safety is easily caused because a customer cannot select proper voltage for power supplement due to insufficient cognition on the battery, and the battery voltage falls back after the charging is stopped, so that the precision is poor;
2. discharging balance, namely, the internal voltage of the battery pack is completely drained, the ternary material is drained to 2.75V, and the lithium iron phosphate is drained to 2.5V, so that the method has low efficiency, the problem of safety is easily caused because a customer cannot select proper voltage for emptying due to insufficient cognition on the battery, and the battery voltage rebounds after discharging is cut off, so that the precision is poor;
3. charging and discharging are balanced, software calculates a fastest voltage point, high voltage is lowered, low voltage is supplemented, the scheme is automatically identified, self-learning capability is achieved, selection of a customer is not needed, and automatic balancing is achieved directly.
The traditional charge-discharge balancing instrument can automatically balance, but cannot ensure that the voltage rebounds uniformly or does not rebound after discharging, so that the voltage difference of the battery is small at the moment of balancing, but the phenomenon of pressure difference rebounding can occur once the balancing is stopped.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a lithium battery pack life prolonging system with constant-current and constant-voltage charging and discharging and also provides a life prolonging method based on the lithium battery pack life prolonging system with constant-current and constant-voltage charging and discharging.
The invention discloses a lithium battery pack service life prolonging system with constant-current and constant-voltage charging and discharging, which comprises a controller, a voltage acquisition module, a switching module for switching to an Nth battery cell of a lithium battery pack, a switching module for balancing the Nth battery cell, a power module and a constant-current and constant-voltage charging and discharging module for constant-current and constant-voltage charging and discharging of the Nth battery cell, wherein N is a positive integer, the voltage acquisition module is used for respectively acquiring the voltage of each battery cell of the lithium battery pack, the output end of the voltage acquisition module is connected with the controller, one end of the power module is connected with the output end of the constant-current and constant-voltage charging and discharging module, the other end of the power module is connected with the Nth battery.
The invention is further improved and also comprises a display module, wherein the input end of the display module is connected with the output end of the controller.
The invention is further improved, each string of battery cores is provided with a group of power modules and constant-current and constant-voltage charging and discharging modules, and the controller controls the voltage balance of each string of battery cores through the constant-current and constant-voltage charging and discharging modules.
The invention is further improved, the constant current and constant voltage charging and discharging module comprises a constant current PID loop module, a charging constant voltage PID loop module and a discharging constant voltage PID loop module, the input ends of the constant current PID loop module, the charging constant voltage PID loop module and the discharging constant voltage PID loop module are respectively connected with the output end of the controller, and the output ends of the constant current PID loop module, the charging constant voltage PID loop module and the discharging constant voltage PID loop module are connected with the power module.
The invention is further improved, the constant current PID loop module comprises an operational amplifier U7, a positive phase input pin 3 of the operational amplifier U7 is connected with the controller and is connected with a set constant current analog quantity, a negative phase input pin 2 is connected with the current electric core current, an output pin 6 of the operational amplifier U7 is respectively connected with the power module through a resistor,
when the current of the battery cell is larger than the set constant current analog quantity, the constant current PID loop module reduces the output of an output pin 6 of the operational amplifier U7, and when the current of the battery cell is smaller than the set constant current analog quantity, the output of the output pin 6 of the operational amplifier U7 is pulled high, and finally the constant current PID loop module enters a stable state, so that constant current output is achieved, the voltage of the power module is controlled, and the conduction internal resistance of the power module is adjusted.
The invention is further improved, the discharging constant voltage PID loop module comprises an operational amplifier U1, an inverting input pin 2 of the operational amplifier U1 is connected with the controller and is connected with a first set constant voltage analog quantity, a non-inverting input pin 3 is connected with the current cell voltage, an output pin 6 of the operational amplifier U1 is connected with the power module,
when the cell voltage is greater than the first set constant voltage analog quantity, the output of the output pin 6 of the operational amplifier U1 is reduced, and when the current cell voltage is less than the first set constant voltage analog quantity, the output of the output pin 6 of the operational amplifier U1 is pulled high and finally enters a stable state, so that constant voltage discharge is achieved, the voltage of the power module is controlled, and the on-resistance of the power module is adjusted.
In a further improvement of the invention, the charging constant voltage PID loop module comprises an operational amplifier U6, a positive phase input pin 3 of the operational amplifier U6 is connected with the controller and is connected with a second set constant voltage analog quantity, a negative phase input pin 2 is connected with the current cell voltage, an output pin 6 of the operational amplifier U6 is connected with the power module,
when the cell voltage is less than the second set constant current analog quantity, the output of the output pin 6 of the operational amplifier U6 is pulled high, and finally the charging constant voltage PID loop module enters a stable state, so that constant voltage charging is achieved, the voltage of the power module is controlled, and the conduction internal resistance of the power module is adjusted.
The invention also provides a method for prolonging the service life of the lithium battery pack based on the system with constant-current and constant-voltage charging and discharging, which is characterized by comprising the following steps of:
s1: the controller collects the voltage of each string of battery cells and calculates the voltage difference;
s2: judging whether the voltage difference of all the battery cores is within a set range, if so, finishing the equalization of the battery, and if not, executing the step S3;
s3: calculating a maximum efficiency voltage, and determining the working state of each battery cell;
s4: selecting one of the battery cores with the voltage difference not within the set range, and performing constant-current and constant-voltage charging or discharging on the battery core through a constant-current and constant-voltage charging and discharging module;
s5: judging whether the voltage difference of the battery cell string is within a set range, if so, completing the equalization of the battery cell string, and then circularly executing the steps S3-S5 until the voltage difference of all the battery cells is within the set range;
s6: and finishing the equalization of the lithium battery pack.
According to the further improvement of the invention, in step S3, according to the voltage of the battery, if the voltage of the cell in the current string is greater than the calculated voltage value, the cell is subjected to constant-current and constant-voltage discharge, if the voltage of the cell in the current string is less than the calculated voltage value, the cell is subjected to constant-current and constant-voltage charge, and if the voltage difference of the cell is within the set value, the cell in the current string is not operated.
The invention is further improved, in step S4 and step S5, the cell with large voltage difference is charged/discharged by large current, and then is switched to other cell strings after the voltage is settled, so as to perform equalization in this mode.
Compared with the prior art, the invention has the beneficial effects that: the battery type is not required to be known, full-automatic equalization is realized, constant-current and constant-voltage charging and discharging are adopted, the voltage does not fall back or fall back uniformly after charging is completed, and the voltage does not bounce back or bounce slightly and uniformly after discharging is completed, so that the service life of the battery pack is greatly prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic circuit diagram of a constant current PID loop module;
FIG. 3 is a schematic circuit diagram of a discharging constant voltage PID loop module;
FIG. 4 is a schematic circuit diagram of a discharging constant voltage PID loop module;
FIG. 5 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the battery pack of the present invention includes more than 2 batteries, each battery includes a string of battery cells, and the system for prolonging the life of the lithium battery pack with constant current and constant voltage charging and discharging includes a controller, a voltage acquisition module, a switching module for switching to the nth string of battery cells of the lithium battery pack and balancing the nth string of battery cells, a power module, and a constant current and constant voltage charging and discharging module for constant current and constant voltage charging and discharging of the nth string of battery cells, where N is a positive integer, the voltage acquisition module respectively acquires the voltage of each string of battery cells of the lithium battery pack, the output end of the voltage acquisition module is connected with the controller, one end of the power module is connected with the output end of the constant current and constant voltage charging and discharging module, the other end of the power module is connected with the nth string of battery cells.
The power module in this example is an MOS transistor, and the control end of the MOS transistor is connected to the controller, but of course, the power module in this example may also be another power module capable of changing voltage between both ends, such as a switching transistor.
The display module is connected with the output end of the controller and used for displaying the current working state of the controller. The system can be operated by adding a touch screen.
As shown in fig. 1-4, the constant-current constant-voltage charging and discharging module of this embodiment includes a constant-current PID loop module, a charging constant-voltage PID loop module, and a discharging constant-voltage PID loop module, wherein the input ends of the constant-current PID loop module, the charging constant-voltage PID loop module, and the discharging constant-voltage PID loop module are respectively connected to the output end of the controller, and the output ends of the constant-current PID loop module, the charging constant-voltage PID loop module, and the discharging constant-voltage PID loop module are connected to the power module.
As shown in fig. 2, the constant current PID loop module in this embodiment includes an operational amplifier U7, a non-inverting input pin 3 of the operational amplifier U7 is connected to the controller, and is connected to a set constant current analog, a non-inverting input pin 2 is connected to a current cell current, an output pin 6 of the operational amplifier U7 is connected to the power module through a resistor,
when the cell current is larger than the set constant current analog quantity, the constant current PID loop module reduces the output of an output pin 6 of the operational amplifier U7, and when the current is smaller than the set constant current analog quantity, the output of the output pin 6 of the operational amplifier U7 is pulled high and finally enters a stable state, so that constant current output is achieved, and the VGS voltage of the MOS tube is controlled to adjust the conduction internal resistance of the MOS tube.
As shown in fig. 3, the discharging constant voltage PID loop module includes an operational amplifier U1, the inverting input pin 2 of the operational amplifier U1 is connected to the controller, and is connected to the first set constant voltage analog, the non-inverting input pin 3 is connected to the current cell voltage, the output pin 6 of the operational amplifier U1 is connected to the power module,
when the cell voltage is greater than the first set constant voltage analog quantity, the output of the output pin 6 of the operational amplifier U1 is reduced, and when the current cell voltage is less than the first set constant voltage analog quantity, the output of the output pin 6 of the operational amplifier U1 is pulled high and finally enters a stable state, so that constant voltage discharge is achieved, and the VGS voltage of the MOS tube is controlled to adjust the conduction internal resistance of the MOS tube.
The charging constant voltage PID loop module of the embodiment comprises an operational amplifier U6, wherein a non-inverting input pin 3 of the operational amplifier U6 is connected with a controller and is connected with a second set constant voltage analog quantity, an inverting input pin 2 is connected with the current cell voltage, an output pin 6 of the operational amplifier U6 is connected with a power module,
when the cell voltage is smaller than the second set constant current analog quantity, the output of the output pin 6 of the operational amplifier U6 is pulled high, and finally the charging enters a stable state, so that constant voltage charging is achieved, and the VGS voltage of the MOS tube is controlled to adjust the conduction internal resistance of the MOS tube.
As another embodiment of the present invention, each string of battery cells in this example is provided with a group of power modules and constant-current and constant-voltage charging and discharging modules, and the controller controls voltage balance of each string of battery cells through the constant-current and constant-voltage charging and discharging modules.
The invention adopts constant-current constant-voltage charging and discharging technology, and performs constant-current constant-voltage charging and discharging with the same voltage for each string of batteries in the battery pack, the constant-current constant-voltage discharging with high battery voltage is performed, and the constant-current constant-voltage charging with low battery is performed, so that the voltages of the battery packs are consistent, and the service life of the battery pack is prolonged.
The constant voltage discharge technology is applied to the lithium titanate battery, the control principle is that the battery starts constant current discharge, when a constant voltage discharge point is reached, a discharge voltage PID loop works, the discharge current is reduced through control, the constant current discharge voltage of the battery per se can be reduced, but when the constant current becomes small, the voltage can rebound and rise, so that the effect of constant voltage discharge can be achieved by adjusting the balance and ensuring that the rising value and the falling value are the same.
As shown in fig. 5, the implementation steps of the method for prolonging the service life of the lithium battery pack based on the constant-current and constant-voltage charging and discharging system of the invention are as follows:
1. starting equipment, automatically inspecting each string of voltage of the battery pack, calculating a voltage difference delta V, recording the voltage of each string of electric cores, judging whether the voltage difference is within a range set by a customer, if so, finishing the test, and if not, calculating a highest-efficiency voltage value.
2. And according to the calculated voltage value, if the voltage of the current string of the electric cores is greater than the calculated voltage value, a constant-current constant-voltage discharging step is provided, if the voltage of the current string of the electric cores is less than the calculated voltage value, a constant-current constant-voltage charging step is provided, and if the voltage of the current string of the electric cores is within the set range, the current string of the electric cores is not operated.
3. For the battery cell with large voltage difference, large current charging/discharging is firstly adopted, and then the battery cell is placed and cut into other strings after the voltage is calm, so that the battery cell is balanced in the mode.
4. And judging whether the voltage difference of each battery string of the battery pack is within the range, if not, the battery voltage difference is equalized again within the set range, and if all the battery cells conform to the set range, the battery equalization is finished, and the service life of the battery pack is prolonged.
In conclusion, the invention adopts a constant-current constant-voltage charge-discharge balancing mode, so that a client can automatically calculate a balancing value without knowing the type of the battery, the system has a self-learning function, and the battery is fully automatically balanced.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. The utility model provides a take lithium cell group life-span extension system of constant current and constant voltage charge-discharge which characterized in that: the device comprises a controller, a voltage acquisition module, a switching module, a power module and a constant-current and constant-voltage charge-discharge module, wherein the switching module is used for switching to an Nth serial electric core of the lithium battery pack, balancing the Nth serial electric core, and the constant-current and constant-voltage charge-discharge module is used for constant-current and constant-voltage charge-discharge of the Nth serial electric core.
2. The system of claim 1, wherein the system is configured to extend the life of a lithium battery pack with constant current and voltage charging and discharging, and further configured to: the display device further comprises a display module, and the input end of the display module is connected with the output end of the controller.
3. The system for prolonging the service life of the lithium battery pack with constant-current and constant-voltage charging and discharging according to claim 1 or 2, is characterized in that: each string of battery cores is provided with a group of power modules and constant-current and constant-voltage charging and discharging modules, and the controller controls the voltage balance of each string of battery cores through the constant-current and constant-voltage charging and discharging modules.
4. The system of claim 3, wherein the system is configured to extend the life of the lithium battery pack with constant current and voltage charging and discharging, and further configured to: the constant-current constant-voltage charging and discharging module comprises a constant-current PID loop module, a charging constant-voltage PID loop module and a discharging constant-voltage PID loop module, the input ends of the constant-current PID loop module, the charging constant-voltage PID loop module and the discharging constant-voltage PID loop module are respectively connected with the output end of the controller, and the output ends of the constant-current PID loop module, the charging constant-voltage PID loop module and the discharging constant-voltage PID loop module are connected with the power module.
5. The system of claim 4, wherein the system is configured to extend the life of the lithium battery pack with constant current and voltage charging and discharging, and further configured to: the constant current PID loop module comprises an operational amplifier U7, a positive phase input pin 3 of the operational amplifier U7 is connected with a controller and is connected with a set constant current analog quantity, a negative phase input pin 2 is connected with the current cell current, an output pin 6 of the operational amplifier U7 is connected with a power module through a resistor respectively,
when the current of the battery cell is larger than the set constant current analog quantity, the constant current PID loop module reduces the output of an output pin 6 of the operational amplifier U7, and when the current of the battery cell is smaller than the set constant current analog quantity, the output of the output pin 6 of the operational amplifier U7 is pulled high, and finally the constant current PID loop module enters a stable state, so that constant current output is achieved, the voltage of the power module is controlled, and the conduction internal resistance of the power module is adjusted.
6. The system of claim 4, wherein the system is configured to extend the life of the lithium battery pack with constant current and voltage charging and discharging, and further configured to: the discharging constant voltage PID loop module comprises an operational amplifier U1, an inverting input pin 2 of the operational amplifier U1 is connected with a controller and is connected with a first set constant voltage analog quantity, a non-inverting input pin 3 is connected with the current cell voltage, an output pin 6 of the operational amplifier U1 is connected with a power module,
when the cell voltage is greater than the first set constant voltage analog quantity, the output of the output pin 6 of the operational amplifier U1 is reduced, and when the current cell voltage is less than the first set constant voltage analog quantity, the output of the output pin 6 of the operational amplifier U1 is pulled high and finally enters a stable state, so that constant voltage discharge is achieved, the voltage of the power module is controlled, and the on-resistance of the power module is adjusted.
7. The system of claim 4, wherein the system is configured to extend the life of the lithium battery pack with constant current and voltage charging and discharging, and further configured to: the charging constant voltage PID loop module comprises an operational amplifier U6, a positive phase input pin 3 of the operational amplifier U6 is connected with a controller and is connected with a second set constant voltage analog quantity, a negative phase input pin 2 is connected with the current cell voltage, an output pin 6 of the operational amplifier U6 is connected with a power module,
when the cell voltage is less than the second set constant current analog quantity, the output of the output pin 6 of the operational amplifier U6 is pulled high, and finally the charging constant voltage PID loop module enters a stable state, so that constant voltage charging is achieved, the voltage of the power module is controlled, and the conduction internal resistance of the power module is adjusted.
8. The method for prolonging the service life of the lithium battery pack with constant-current and constant-voltage charging and discharging based on any one of claims 1 to 7 is characterized by comprising the following steps of:
s1: the controller collects the voltage of each string of battery cells and calculates the voltage difference;
s2: judging whether the voltage difference of all the battery cores is within a set range, if so, finishing the equalization of the battery, and if not, executing the step S3;
s3: calculating a maximum efficiency voltage, and determining the working state of each battery cell;
s4: selecting one of the battery cores with the voltage difference not within the set range, and performing constant-current and constant-voltage charging or discharging on the battery core through a constant-current and constant-voltage charging and discharging module;
s5: judging whether the voltage difference of the battery cell string is within a set range, if so, completing the equalization of the battery cell string, and then circularly executing the steps S3-S5 until the voltage difference of all the battery cells is within the set range;
s6: and finishing the equalization of the lithium battery pack.
9. The system of claim 8, wherein the system is configured to extend the life of a lithium battery pack with constant current and voltage charging and discharging, and further configured to: in step S3, according to the voltage of the battery, if the voltage of the cell string is greater than the calculated voltage value, the cell is subjected to constant current and constant voltage discharge, if the voltage of the cell string is less than the calculated voltage value, the cell is subjected to constant current and constant voltage charge, and if the voltage difference between the cells is within the set value, the cell string is not operated.
10. The system of claim 8, wherein the system is configured to extend the life of a lithium battery pack with constant current and voltage charging and discharging, and further configured to: in steps S4 and S5, the cells with large voltage difference are charged/discharged with large current, and then are switched to other cell strings after the voltage is settled, so as to perform equalization in this mode.
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| CN114374007A (en) * | 2021-12-30 | 2022-04-19 | 常州智戌新能源电力科技有限公司 | Power lithium battery barrier breaking machine and power lithium battery charging method |
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| CN101924388A (en) * | 2010-07-12 | 2010-12-22 | 无锡晶磊电子有限公司 | Full automatic balance type battery pack charger device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421031A (en) * | 2020-11-24 | 2021-02-26 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN112421031B (en) * | 2020-11-24 | 2022-04-05 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114374007A (en) * | 2021-12-30 | 2022-04-19 | 常州智戌新能源电力科技有限公司 | Power lithium battery barrier breaking machine and power lithium battery charging method |
| CN114374007B (en) * | 2021-12-30 | 2022-11-08 | 常州智戌新能源电力科技有限公司 | Power lithium battery barrier breaking machine and power lithium battery charging method |
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