CN114362301A - Lithium battery charging voltage control method and device - Google Patents
Lithium battery charging voltage control method and device Download PDFInfo
- Publication number
- CN114362301A CN114362301A CN202111615981.7A CN202111615981A CN114362301A CN 114362301 A CN114362301 A CN 114362301A CN 202111615981 A CN202111615981 A CN 202111615981A CN 114362301 A CN114362301 A CN 114362301A
- Authority
- CN
- China
- Prior art keywords
- charging
- voltage
- lithium battery
- constant
- protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of lithium battery charging protection, in particular to a lithium battery charging voltage control method and device. Compared with the prior art, the charging protection voltage of the charging protection board of the lithium battery when the lithium battery is fully charged is obtained by performing constant-current charging on the lithium battery; when the lithium battery is charged again, constant current charging is performed first, and then constant voltage charging is performed at a voltage value lower than the charging protection voltage. The invention does not need to adopt a high-cost special charging management chip to control the charging of the lithium battery, adopts constant current charging during the prior charging until the protection function of the charging protection board is triggered to record the voltage value close to the protection voltage value, can carry out quick charging through the constant current charging when the lithium battery is charged again, adopts constant voltage charging when the lithium battery is nearly fully charged and takes the recorded voltage value as the full charging condition, and utilizes the characteristic of high triggering precision of the charging protection board to improve the accurate control of the charging voltage so as to prevent the occurrence of the situations of over-charging or under-charging and the like.
Description
Technical Field
The invention relates to the technical field of lithium battery charging protection, in particular to a lithium battery charging voltage control method and device.
Background
In the normal use process of the lithium battery, chemical positive reaction of mutual conversion of electric energy and chemical energy is generated inside the lithium battery. When a lithium battery is charged under certain conditions, overcharge, overdischarge or overcurrent will cause chemical side reactions in the battery, and after the chemical side reactions occur, the performance and service life of the battery are seriously affected, and even more, a large amount of gas is generated, so that the internal pressure of the battery is rapidly increased and then the battery explodes to cause safety problems. Therefore, the lithium battery needs to be provided with a charging protection circuit for effective monitoring and control of charging of the battery, so as to protect the battery under certain conditions to prevent the battery from being damaged.
At present, the lithium battery charging voltage control generally adopts the following two modes: most of the methods are a lithium battery charging protection method and a lithium battery charging protection circuit disclosed by the publication number CN103354349A (the publication date is 10/16/2013), the scheme is that whether a lithium battery is fully charged is generally judged by sampling the battery voltage through a 1/4VDD channel in an MCU, the method is influenced by MCU individual difference, self sampling precision and the like, so that the sampling voltage deviation is overlarge, but the error of +/-1% exists in an MCU internal reference, and the error of +/-3% also exists in 1/4VDD obtained by reducing the voltage of the MCU internal VDD, so that the sampling voltage error is possibly +/-4%, and therefore the sampled battery voltage cannot be used as a full judgment voltage value. When dual protection is needed, only one side is in effect or is not full; when the double protection is not needed, the battery is damaged due to overcharge. The other method is to control the lithium battery charging by using a special charging management chip as shown in fig. 1, and the method has higher control precision, but the scheme has higher cost.
In summary, the method for lithium battery charging protection in the prior art has the problems of high cost or easy occurrence of under-charging or over-charging due to inaccurate detection protection.
Disclosure of Invention
In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a method and a device for controlling a charging voltage of a lithium battery, wherein the method for controlling the charging voltage of the lithium battery comprises:
performing constant-current charging on a lithium battery to obtain a charging protection voltage of a charging protection board of the lithium battery when the lithium battery is fully charged as a first voltage;
when the lithium battery is charged again, constant-current charging is firstly carried out, then constant-voltage charging is carried out by taking the second voltage as a constant-voltage value, and charging is stopped until the charging current is smaller than a preset cut-off current value;
wherein the second voltage is the first voltage minus a preset protection difference.
In an embodiment, the method for obtaining the first voltage includes the following steps:
s10: charging the lithium battery at a constant current and sampling the battery voltage of the lithium battery, wherein the lithium battery has a calibrated full-charge voltage;
s20: when the battery voltage reaches 90-98% of the calibrated full-charge voltage, memorizing the battery voltage once every 0.5-5 seconds;
s30: reading the previously memorized battery voltage as the first voltage when the charging protection board of the lithium battery is used for charging protection.
In an embodiment, in the steps S20 to S30, if the charging protection board does not protect the battery from being charged, the charging is stopped, and the memorized value of the battery voltage is eliminated.
In one embodiment, the first voltage is obtained when the lithium battery is first fully charged.
In one embodiment, the predetermined cut-off current value is 20 to 150 milliamperes.
In one embodiment, the predetermined protection difference is 10 to 50 millivolts.
In an embodiment, when the lithium battery is charged again, the constant voltage charging is performed when the charging voltage of the lithium battery charged by the constant current reaches a second voltage.
In an embodiment, when the lithium battery is charged again, the constant voltage charging is performed when a charging voltage of the lithium battery charged by the constant current reaches a third voltage, where the third voltage is lower than the second voltage.
In one embodiment, the constant current value of the constant current charging is 0.5 to 1.5 amperes.
The invention also provides lithium battery equipment which adopts the lithium battery charging voltage control method.
Based on the above, compared with the prior art, the invention obtains the charging protection voltage of the charging protection board of the lithium battery when the lithium battery is fully charged by performing constant current charging on the lithium battery; when the lithium battery is charged again, constant current charging is performed first, and then constant voltage charging is performed at a voltage value lower than the charging protection voltage. The invention does not need to adopt a high-cost special charging management chip to control the charging of the lithium battery, adopts constant current charging during the prior charging until the protection function of the charging protection board is triggered to record the voltage value close to the protection voltage value, can carry out quick charging through the constant current charging when the lithium battery is charged again, adopts constant voltage charging when the lithium battery is nearly fully charged and takes the recorded voltage value as the full charging condition, and utilizes the characteristic of high triggering precision of the charging protection board to improve the accurate control of the charging voltage so as to prevent the occurrence of the situations of over-charging or under-charging and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts; in the following description, the drawings are illustrated in a schematic view, and the drawings are not intended to limit the present invention.
FIG. 1 is a schematic diagram of a prior art circuit for controlling charging of a lithium battery by using a dedicated charging management chip;
FIG. 2 is a schematic flow chart of a lithium battery charging voltage control method according to the present invention;
FIG. 3 is a schematic diagram of a lithium battery charging circuit according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for obtaining a first voltage according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; the technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, and are not to be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The following description will be made by specific examples.
The invention provides a lithium battery charging voltage control method, which can be applied to products and equipment of a lithium battery power supply, such as electric clippers, shavers and other products, and comprises the following steps as shown in figure 2:
performing constant-current charging on a lithium battery to obtain a charging protection voltage of a charging protection board of the lithium battery when the lithium battery is fully charged as a first voltage;
when the lithium battery is charged again, constant-current charging is firstly carried out, then constant-voltage charging is carried out by taking the second voltage as a constant-voltage value, and charging is stopped until the charging current is smaller than a preset cut-off current value;
wherein the second voltage is the first voltage minus a preset protection difference.
In specific implementation, the present embodiment is described by taking the charging voltage control of a 3.7V 18650 battery as an example, and the nominal full charge voltage of the battery is 4.2V, it should be noted that the present invention is not limited to the battery with the full charge voltage of 4.2V. As shown in fig. 3, which is a schematic diagram of a lithium battery charging circuit of this embodiment, the adapter charges the battery through the MOS transistor, the MCU controls the MOS transistor to charge the battery through the PWM, and the charging voltage of the battery is monitored by sampling the voltage of R10\ R11.
Specifically, as shown in fig. 4, the method for acquiring the first voltage includes the following steps:
firstly, S10 constant current charging with a constant current value of 0.5-1.5A is carried out on the lithium battery, and the battery voltage of the lithium battery is sampled, wherein the lithium battery has a calibrated full-charge voltage; the nominal full-charge voltage in this embodiment is 4.2V, and preferably, the constant current value of the constant current charging is 1 a.
Then S20 memorizing the battery voltage once every 0.5-5 seconds when the battery voltage reaches 90-98% of the calibrated full charge voltage; in some embodiments, a battery with a full charge of 4.2V is charged, and the battery voltage is greater than 4.05V when charged and less than 4.3V and remembers every 1S. Preferably, the memory cycle can take a relatively large value to reduce the number of recording and determining times and increase the charging speed.
S30 reading the previously memorized battery voltage as the first voltage when the charging protection board of the lithium battery is charged and protected. It should be understood that the design goal when the first voltage is recorded is that the first voltage should be equal to the protection voltage when the charging protection board is charging protected for higher accuracy, but due to the memory period, the first voltage may be equal to the protection voltage, i.e. 4.2V, or slightly less than the protection voltage but very close to the protection voltage, with a memory accuracy within ± 10 mV. Preferably, the first voltage is obtained when the lithium battery is charged for the first time, and the full charge condition is determined according to the first voltage obtained by the first full charge when charging is subsequently required so as to improve accuracy of voltage control.
Then, as shown in fig. 2, when the lithium battery is discharged after use and the lithium battery is charged again, first, constant current charging with a constant current value of 1 ampere is performed, and then, constant voltage charging is performed with a second voltage as a constant voltage value until the charging current is smaller than a preset cut-off current value, and the charging is stopped; wherein the second voltage is the first voltage minus a preset protection difference. The preset cut-off current value is 20-150 milliamperes, and preferably, the preset cut-off current value is 100 milliamperes in the embodiment. And the predetermined protection difference is 10 to 50 millivolts, and the predetermined protection difference is not 20 millivolts in the embodiment.
Preferably, in some embodiments, when the lithium battery is charged again later, when the charging voltage of the lithium battery by constant current charging reaches the second voltage, for example, the second voltage in the above embodiments is 4.18 v, and the constant voltage value in constant voltage charging is 4.18 v. Or, in another mode, when the charging voltage of the lithium battery reaches the third voltage through constant current charging, the second voltage is used as a constant voltage value to perform constant voltage charging, for example, the constant voltage charging mode may be set to enter when the battery is charged by the constant current until the battery voltage is 4V, until the charging current is less than a preset cut-off current value of 100 milliamperes. Through the setting of constant current charging first and then constant voltage charging, can realize filling up the battery fast through constant current charging, then through the accurate control charging voltage of constant voltage charging to realize high-efficient, high-quality charge control.
The invention also provides a lithium battery device, such as lithium battery products of electric hair clippers, electric shavers and the like, which adopts the lithium battery charging voltage control method.
In summary, compared with the prior art, the charging protection voltage of the charging protection board of the lithium battery is obtained by performing constant current charging on the lithium battery when the lithium battery is fully charged; when the lithium battery is charged again, constant current charging is performed first, and then constant voltage charging is performed at a voltage value lower than the charging protection voltage. The invention does not need to adopt a high-cost special charging management chip to control the charging of the lithium battery, adopts constant current charging during the prior charging until the protection function of the charging protection board is triggered to record the voltage value close to the protection voltage value, can carry out quick charging through the constant current charging when the lithium battery is charged again, adopts constant voltage charging when the lithium battery is nearly fully charged and takes the recorded voltage value as the full charging condition, and utilizes the characteristic of high triggering precision of the charging protection board to improve the accurate control of the charging voltage so as to prevent the occurrence of the situations of over-charging or under-charging and the like.
In addition, it will be appreciated by those skilled in the art that, although there may be many problems with the prior art, each embodiment or aspect of the present invention may be improved only in one or several respects, without necessarily simultaneously solving all the technical problems listed in the prior art or in the background. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.
Although terms such as constant current charging, constant voltage charging, first voltage, protection voltage, charging protection board, preset current value, and preset are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention; the terms "first," "second," and the like in the description and in the claims, and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A lithium battery charging voltage control method is characterized by comprising the following steps:
performing constant-current charging on a lithium battery to obtain a charging protection voltage of a charging protection board of the lithium battery when the lithium battery is fully charged as a first voltage;
when the lithium battery is charged again, constant-current charging is firstly carried out, then constant-voltage charging is carried out by taking the second voltage as a constant-voltage value, and charging is stopped until the charging current is smaller than a preset cut-off current value;
wherein the second voltage is the first voltage minus a preset protection difference.
2. The lithium battery charging voltage control method according to claim 1, characterized in that: the first voltage obtaining method comprises the following steps:
s10: charging the lithium battery at a constant current and sampling the battery voltage of the lithium battery, wherein the lithium battery has a calibrated full-charge voltage;
s20: when the battery voltage reaches 90-98% of the calibrated full-charge voltage, memorizing the battery voltage once every 0.5-5 seconds;
s30: reading the previously memorized battery voltage as the first voltage when the charging protection board of the lithium battery is used for charging protection.
3. The lithium battery charging voltage control method according to claim 2, characterized in that: and S20, stopping charging if the charging protection board is not charged and protected in the step S30, and eliminating the memorized value of the battery voltage.
4. The lithium battery charging voltage control method according to claim 3, characterized in that: the first voltage is obtained when the lithium battery is fully charged for the first time.
5. The lithium battery charging voltage control method according to claim 1, characterized in that: the preset cut-off current value is 20-150 milliamperes.
6. The lithium battery charging voltage control method according to claim 1, characterized in that: the preset protection difference value is 10-50 millivolts.
7. The lithium battery charging voltage control method according to claim 1, characterized in that: and when the lithium battery is charged again, the constant voltage charging is carried out when the charging voltage of the lithium battery reaches a second voltage through the constant current charging.
8. The lithium battery charging voltage control method according to claim 1, characterized in that: and when the lithium battery is charged again, when the charging voltage of the lithium battery reaches a third voltage through constant current charging, the constant voltage charging is carried out, and the third voltage is smaller than the second voltage.
9. The lithium battery charging voltage control method according to any one of claims 1 to 8, characterized in that: the constant current value of the constant current charging is 0.5-1.5A.
10. A lithium battery device characterized in that: a method of controlling a charging voltage of a lithium battery according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111615981.7A CN114362301A (en) | 2021-12-27 | 2021-12-27 | Lithium battery charging voltage control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111615981.7A CN114362301A (en) | 2021-12-27 | 2021-12-27 | Lithium battery charging voltage control method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114362301A true CN114362301A (en) | 2022-04-15 |
Family
ID=81102997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111615981.7A Pending CN114362301A (en) | 2021-12-27 | 2021-12-27 | Lithium battery charging voltage control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114362301A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000030750A (en) * | 1998-07-08 | 2000-01-28 | Matsushita Electric Ind Co Ltd | Charging method of nonaqueous secondary battery |
| CN108235791A (en) * | 2017-12-07 | 2018-06-29 | 广州丰江电池新技术股份有限公司 | Correct the method for charging lithium-ion battery for making up voltage |
| CN108599310A (en) * | 2015-12-03 | 2018-09-28 | 广东欧珀移动通信有限公司 | A kind of charging method and mobile terminal |
| 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 |
| CN113571787A (en) * | 2020-04-29 | 2021-10-29 | 北京小米移动软件有限公司 | Charging method of lithium ion battery |
-
2021
- 2021-12-27 CN CN202111615981.7A patent/CN114362301A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000030750A (en) * | 1998-07-08 | 2000-01-28 | Matsushita Electric Ind Co Ltd | Charging method of nonaqueous secondary battery |
| CN108599310A (en) * | 2015-12-03 | 2018-09-28 | 广东欧珀移动通信有限公司 | A kind of charging method and mobile terminal |
| CN108235791A (en) * | 2017-12-07 | 2018-06-29 | 广州丰江电池新技术股份有限公司 | Correct the method for charging lithium-ion battery for making up voltage |
| CN113571787A (en) * | 2020-04-29 | 2021-10-29 | 北京小米移动软件有限公司 | Charging method of lithium ion battery |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9121909B2 (en) | Method for estimating state-of-charge of lithium ion battery | |
| EP3832328A1 (en) | Method and apparatus for detecting micro short circuit of battery | |
| US7688075B2 (en) | Lithium sulfur rechargeable battery fuel gauge systems and methods | |
| CN105629172B (en) | A kind of method and device of mixing accumulator fault detection | |
| EP3839537B1 (en) | Battery management apparatus | |
| Baccouche et al. | $ Implementation of a Coulomb counting algorithm for SOC estimation of Li-Ion battery for multimedia applications | |
| US20090295332A1 (en) | Battery pack and charging method for the same | |
| EP2416166A2 (en) | Method and apparatus for diagnosing an abnormality of a current-measuring unit of a battery pack | |
| GB1531294A (en) | Method for checking a storage battery | |
| CN101816092A (en) | Secondary cell charge control method and charge control circuit | |
| EP3958006A1 (en) | Battery diagnosis apparatus and method | |
| US20120268059A1 (en) | Charge stop point detecting method, charge stop point detecting device, and a battery pack | |
| CN116660768B (en) | Circulation test method and battery test system | |
| US11815558B2 (en) | Apparatus and method for diagnosing abnormal degradated battery cell | |
| He et al. | iCharge: User-interactive charging of mobile devices | |
| KR20210048810A (en) | Apparatus and method for diagnosing degeneracy of battery | |
| CN111953033B (en) | Flexible charging control method | |
| KR20180031206A (en) | Battery management system and method for protecting a battery from over-discharge | |
| CN103401037A (en) | Charging method for traction storage battery | |
| JP3649643B2 (en) | Lithium-ion battery capacity estimation method | |
| Schmid et al. | Electrochemical balancing of lithium-ion cells by nickel-based cells | |
| CN114362301A (en) | Lithium battery charging voltage control method and device | |
| US20210088596A1 (en) | Internal resistance estimating method, and secondary battery charging device | |
| EP4202466A1 (en) | Internal short circuit detection method for battery, electronic device, and storage medium | |
| CN208520977U (en) | A kind of identification device of lithium electricity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |