CN111509803A - Stepped lithium battery charging control method - Google Patents
Stepped lithium battery charging control method Download PDFInfo
- Publication number
- CN111509803A CN111509803A CN202010337672.7A CN202010337672A CN111509803A CN 111509803 A CN111509803 A CN 111509803A CN 202010337672 A CN202010337672 A CN 202010337672A CN 111509803 A CN111509803 A CN 111509803A
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- Prior art keywords
- current
- battery
- voltage
- charging
- constant
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- 238000007600 charging Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 21
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- 239000007773 negative electrode material Substances 0.000 claims description 3
- 238000010277 constant-current charging Methods 0.000 abstract description 14
- 238000010280 constant potential charging Methods 0.000 abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 230000004913 activation Effects 0.000 abstract 1
- 229910002804 graphite Inorganic materials 0.000 abstract 1
- 239000010439 graphite Substances 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
Images
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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
- H02J7/00718—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to charge current gradient
-
- 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
- H02J7/007184—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage in response to battery voltage gradient
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
In order to increase the energy density of the lithium battery, silicon is used as a cathode and is a common means, and the silicon has good energy density (theoretical value 4000mAh/g) which is 20 times of that of graphite; the invention discloses a method for controlling formation and charging of a lithium battery based on a silicon cathode, which comprises the steps of firstly charging the battery with constant current and constant voltage by using current of 0.7C until the voltage of the battery reaches 4.1V and the current of 0.5C is cut off; then, constant-current and constant-voltage charging is carried out on the battery by the current of 0.5C until the voltage of the battery reaches 4.15V and the current of 0.3C is cut off; then, constant-current and constant-voltage charging is carried out on the battery by the current of 0.3C until the voltage of the battery reaches 4.25V and the current of 0.15C is cut off; finally, constant-current and constant-voltage charging is carried out on the battery at the current of 0.15C until the voltage of the battery reaches 4.35V and the current of 0.02C is cut off; until the battery is fully charged. Compared with the charging control method in the prior art, the charging control method provided by the invention effectively activates the capacity of the lithium battery, realizes the complete activation of the silicon cathode lithium battery, and ensures the charging safety.
Description
Technical Field
The invention belongs to the technical field of battery charging, and particularly relates to a stepped lithium battery charging control method.
Background
With the increasing prominence of the problems of environmental pollution, energy crisis, greenhouse effect and the like, people begin to pay more attention to rechargeable batteries. Batteries are the most important energy storage elements in electric vehicles and power storage stations, or mobile phones and notebook computers. However, the problem of battery life is always a big problem which is difficult to solve, the capacity of a common lithium ion battery is not enough to meet the requirement, the adoption of a silicon cathode is a common consensus, and the problem that the adoption of the silicon cathode needs to solve is too many, so that the citation is narrow. If the charging method is not proper, the capacity of the battery is greatly attenuated, and even the battery is possible to fail, burn, explode and the like.
The formation charging control method of the silicon cathode is an important factor for activating the capacity of a high-energy battery of the silicon cathode, and the current main charging methods comprise a constant-current charging method, a constant-voltage charging method, a constant-current constant-voltage charging method and the like.
1. In the initial charging stage of the constant-current charging method, the charging current is far less than the acceptable charging current of the power battery, so that the early charging time is longer, and in the later charging stage, the charging current is greater than the acceptable charging current of the power battery, so that the temperature of the battery is increased sharply, and the service life of the battery is influenced.
2. The constant voltage charging method has disadvantages that the charging current is too large at the initial charging stage and is likely to exceed the maximum charging current value acceptable for the battery, which causes adverse effect on the service life of the battery, and the battery plate is easy to bend, causing the battery to be scrapped, however, at the final charging stage, the charging current is very small due to the rise of the electromotive force of the battery, and causing the problem of the battery undercharging.
3. The constant-current constant-voltage charging method avoids the defects that the charging current is too large in the initial charging stage and the overcharge is easily caused in the final charging stage, but the problem of undercharge is not well solved, and the initial charging stage has a single charging current value, so that the safe, quick and efficient charging cannot be realized.
The current commonly adopted charging mode is a constant-current and constant-voltage charging mode, and the method has long constant-voltage time in the charging process and is difficult to achieve the purpose of quick charging. The purpose of activating the charging quantity can be achieved by increasing the limiting voltage of the battery during constant-current charging, but the limiting voltage of the battery is too high, and side reactions occur in the battery; the limiting voltage is too low and the battery is difficult to fully charge. One difficulty with conventional lithium ion batteries is that when the battery is discharged to near 0V, it exhibits a loss in transfer capacity and cannot be charged by a typical constant current and voltage charging method.
Disclosure of Invention
According to one aspect of the invention, a stepped lithium battery charging control method is provided, which can activate the capacity of a rechargeable battery to effectively fully charge the battery capacity.
The invention provides a stepped lithium battery charging control method, which requires that a negative active material of a lithium battery is silicon, and the principle is to set constant voltage and current required by charging, charging cut-off current and charging cut-off voltage according to performance parameters of the lithium battery, and comprises the following stepped charging steps:
a. the battery is charged with constant current and constant voltage by the current of 0.7C until the voltage of the battery reaches 4.1V and the current of 0.5C is cut off;
b. the battery is charged with constant current and constant voltage by the current of 0.5C until the voltage of the battery reaches 4.15V and the current of 0.3C is cut off;
c. the battery is charged with constant current and constant voltage by the current of 0.3C until the voltage of the battery reaches 4.25V and the current of 0.15C is cut off;
d. the battery is charged with constant current and constant voltage by the current of 0.15C until the voltage of the battery reaches 4.35V and the current of 0.02C is cut off;
e. until the battery is fully charged.
The method is applied to a charger comprising a main controller, a flyback converter and a sampling circuit, wherein the main controller acquires the real-time input voltage of the charger and the real-time voltage of a rechargeable battery through the sampling circuit, calculates the duty ratio for controlling the conduction time of a main switch of the flyback converter according to the real-time input voltage of the charger and the real-time voltage of the rechargeable battery, and outputs the PWM wave with the corresponding duty ratio to realize the charging control of the battery.
The invention provides a stepped lithium battery charging control method, which comprises the steps of firstly, carrying out constant-current and constant-voltage charging on a battery by using a current of 0.7C until the voltage of the battery reaches 4.1V and the current of 0.5C is cut off; then, constant-current and constant-voltage charging is carried out on the battery by the current of 0.5C until the voltage of the battery reaches 4.15V and the current of 0.3C is cut off; then, constant-current and constant-voltage charging is carried out on the battery by the current of 0.3C until the voltage of the battery reaches 4.25V and the current of 0.15C is cut off; finally, constant-current and constant-voltage charging is carried out on the battery at the current of 0.15C until the voltage of the battery reaches 4.35V and the current of 0.02C is cut off; until the battery is fully charged.
Drawings
Fig. 1 is a flowchart of an embodiment of a stepped lithium battery charging control method according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
1. According to the stepped lithium battery charging control method provided by the invention, the main controller controls the on and off of the MOS tube switch through the driving circuit, so that the controllable charging of the battery is realized. The main controller can also sample the input voltage and the terminal voltage of each battery in real time through the sampling circuit, and carry out intelligent charging control according to the real-time electric quantity of the batteries. The negative active material of the lithium battery is required to be silicon, the principle is that constant voltage and current required by charging, charging cut-off current and charging cut-off voltage are set according to the performance parameters of the lithium battery, and the lithium battery comprises the following step-type charging steps:
firstly, charging the battery with constant current and constant voltage by using 0.7C current until the voltage of the battery reaches 4.1V and the 0.5C current is cut off; then, constant-current and constant-voltage charging is carried out on the battery by the current of 0.5C until the voltage of the battery reaches 4.15V and the current of 0.3C is cut off; then, constant-current and constant-voltage charging is carried out on the battery by the current of 0.3C until the voltage of the battery reaches 4.25V and the current of 0.15C is cut off; finally, constant-current and constant-voltage charging is carried out on the battery at the current of 0.15C until the voltage of the battery reaches 4.35V and the current of 0.02C is cut off; until the battery is fully charged. Compared with the charging control method in the prior art, the charging control method of the rechargeable battery provided by the invention effectively activates the capacity of the lithium battery, realizes quick full charge of the battery and ensures the charging safety.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (1)
1. A stepped lithium battery charging control method requires a negative active material of the lithium battery to be silicon, and is characterized in that: the principle is that constant voltage and current required by charging, charging cut-off current and charging cut-off voltage are set according to the performance parameters of the lithium battery, and the method comprises the following step-type charging steps:
a. the battery is charged with constant current and constant voltage by the current of 0.7C until the voltage of the battery reaches 4.1V and the current of 0.5C is cut off;
b. the battery is charged with constant current and constant voltage by the current of 0.5C until the voltage of the battery reaches 4.15V and the current of 0.3C is cut off;
c. the battery is charged with constant current and constant voltage by the current of 0.3C until the voltage of the battery reaches 4.25V and the current of 0.15C is cut off;
d. the battery is charged with constant current and constant voltage by the current of 0.15C until the voltage of the battery reaches 4.35V and the current of 0.02C is cut off;
e. the battery is fully charged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337672.7A CN111509803A (en) | 2020-04-26 | 2020-04-26 | Stepped lithium battery charging control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337672.7A CN111509803A (en) | 2020-04-26 | 2020-04-26 | Stepped lithium battery charging control method |
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| Publication Number | Publication Date |
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| CN111509803A true CN111509803A (en) | 2020-08-07 |
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| CN202010337672.7A Pending CN111509803A (en) | 2020-04-26 | 2020-04-26 | Stepped lithium battery charging control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994154A (en) * | 2021-02-25 | 2021-06-18 | 维沃移动通信有限公司 | Low-temperature charging method and device of lithium ion battery and electronic equipment |
| CN113421999A (en) * | 2021-06-21 | 2021-09-21 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110037439A1 (en) * | 2009-08-17 | 2011-02-17 | Apple Inc. | Increasing energy density in rechargeable lithium battery cells |
| CN102473969A (en) * | 2009-12-14 | 2012-05-23 | 松下电器产业株式会社 | Charging method and battery pack for non-aqueous electrolyte secondary battery |
| US20150022160A1 (en) * | 2013-07-19 | 2015-01-22 | Apple Inc. | Adaptive effective c-rate charging of batteries |
| CN104467103A (en) * | 2014-12-19 | 2015-03-25 | 重庆星联云科科技发展有限公司 | Charge control method for rechargeable battery |
-
2020
- 2020-04-26 CN CN202010337672.7A patent/CN111509803A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110037439A1 (en) * | 2009-08-17 | 2011-02-17 | Apple Inc. | Increasing energy density in rechargeable lithium battery cells |
| CN102473969A (en) * | 2009-12-14 | 2012-05-23 | 松下电器产业株式会社 | Charging method and battery pack for non-aqueous electrolyte secondary battery |
| US20150022160A1 (en) * | 2013-07-19 | 2015-01-22 | Apple Inc. | Adaptive effective c-rate charging of batteries |
| CN104467103A (en) * | 2014-12-19 | 2015-03-25 | 重庆星联云科科技发展有限公司 | Charge control method for rechargeable battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994154A (en) * | 2021-02-25 | 2021-06-18 | 维沃移动通信有限公司 | Low-temperature charging method and device of lithium ion battery and electronic equipment |
| CN113421999A (en) * | 2021-06-21 | 2021-09-21 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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Application publication date: 20200807 |
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