CN101257220A - Method for charging lithium ion batteries - Google Patents
Method for charging lithium ion batteries Download PDFInfo
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- CN101257220A CN101257220A CNA2007100604020A CN200710060402A CN101257220A CN 101257220 A CN101257220 A CN 101257220A CN A2007100604020 A CNA2007100604020 A CN A2007100604020A CN 200710060402 A CN200710060402 A CN 200710060402A CN 101257220 A CN101257220 A CN 101257220A
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- battery
- charge
- current
- lithium ion
- charging
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- 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 discloses a li-ion battery group charge method with long cycle life and safety charge process. The method processes voltage monitor for each layer battery or battery group in series of the li-ion battery group, thereby, voltage feedback information can be obtained and charge current is adjusted, constant current charge with various phase is reached, namely, controllable constant current charge under voltage feedback of each layer in series. Each battery threshold value voltage is set with aV in circuit, controllable constant current phases are six phases: 1C, 0.5C, 0.2C, 0.1C, 0.05C, 0.02C, when random one battery reaches threshold value voltage, a control circuit reduces charge current according with order above mentioned, until 0.02C constant charge, this moment, all single battery reaching threshold value voltage starts exterior current equilibrium. The method provided by the invention simplifies battery matched group problem in production process, and increases battery matched group ratio.
Description
Technical field
The invention belongs to method for charging lithium ion batteries, more particularly, relate to a kind of charging method at the big current balance of many cascaded lithium ion batteries group.
Background technology
Since lithium ion battery used in mobile phone in a large number, a lot of fields all brought into use lithium ion battery to power for the electrical appliance of oneself as power supply, and lithium ion battery has also begun a large amount of uses in the power field simultaneously.The scope of application as the lithium ion battery group is more and more general, and this just requires us to use for a long time in the safety that guarantees battery pack aspect the battery pack use.The charge balancing of lithium ion battery group is a problem that relatively perplexs everybody always in use development these years.
Summary of the invention
The present invention is directed to lithium ion battery group equalizing charge problem and improve, improved lithium ion battery group large current charge to a great extent, provide a kind of and have extended cycle life, charging process safe lithium ion battery group charging method.
Be directed to the present invention of lithium ion battery group and use single battery valve threshold voltage feedback, but the multistage current constant mode carries out controlled charging.
The technical scheme of method for charging lithium ion batteries of the present invention is:
Each layer series-connected cell or battery pack in the lithium ion battery group are carried out voltage monitoring, thereby obtain the adjustment that Voltage Feedback information is carried out charging current, reached the constant current charge of different phase, be i.e. controlled constant current charge under each series connection layer Voltage Feedback.A general purpose single lithium ion battery observation circuit is placed on every battery positive and negative electrode of lithium ion battery group, but bringing into use the controlled charging threshold voltage that we are provided with every battery in circuit is aV, controlled constant-current phase is 1C, 0.5C, 0.2C, 0.1C, 0.05C, 0.02C, six stages, control circuit just reduced charging current according to said sequence when any battery reached threshold voltage in battery pack, and until the 0.02C constant current charge, all single batteries that arrive threshold voltage this moment begin to carry out the foreign current equilibrium.
The present invention is to use this charging method to make that each battery can both reach a relative optimal charge state in the battery pack, thereby guarantees the long-term use of whole battery group safety.The performance at random that the inventive method uses rigorous mathematical derivation mode to carry out every battery in the battery pack is calculated, and is turned back in the reality more theoretically and verifies.Under the present invention, use the equalizing charge of 0.5C controllable parameters, charge and discharge cycles is carried out in the 1C discharge, use (the 0.33C constant current of original charge mode simultaneously, constant voltage charge is changeed in the back), the 1C discharge compares circulation, and the battery pack that experimental result is to use the present invention to carry out charge and discharge cycles remains on more than 80% at 300 circulation back capacity, and the battery pack under original charge and discharge mode has only 55% at 300 circulation back capacity, cell-support structure is out of shape to some extent simultaneously, so result of the test is more satisfactory.
The present invention simplifies battery combo matching problem in the production process, improves the combo rate between battery, and combo rate of original structure is 75%, uses the present invention to carry out combo, and one time the combo rate can reach 82%; Improve the fail safe of battery pack in charging process; And obviously improve the cycle performance of battery.
Description of drawings
Fig. 1 is a control mode schematic diagram of the present invention.
Embodiment
Use electric bicycle to carry out the test of charging method, a general purpose single lithium ion battery observation circuit is placed on every battery plus-negative plate of existing 10Ah36V lithium ion battery group, but brings into use controlled charging with 10Ah36V lithium ion battery group.
The threshold voltage that we are provided with every battery in observation circuit is 4.2V, controlled constant-current phase is 1C, 0.5C, 0.2C, 0.1C, 0.05C, 0.02C, six stages, electric current constant-current control circuit when any battery reaches threshold voltage in battery pack, just reduce charging current according to said sequence, until the 0.02C constant current charge, all single batteries that arrive threshold voltage this moment begin to carry out the foreign current equilibrium.The control mode principle as shown in Figure 1.
When the cell more than 2/3 carried out outside equalization operation in the battery pack, the charge closing device was finished charging process.
This method is verified:
Use the 1C electric current that battery pack is discharged, but and then carry out controlled charging, so circulate, detect the process voltage of each battery simultaneously, carry out data record, using another Battery pack group to carry out traditional charge and discharge cycles test simultaneously in order to contrast.But through the battery pack of controlled charging aspect cycle life and the fail safe aspect obviously be better than the lithium ion battery group of traditional charging modes.
Claims (1)
1. a method for charging lithium ion batteries is characterized in that, carries out according to following step: a general purpose single lithium ion battery observation circuit is placed on every battery positive and negative electrode of lithium ion battery group, but brings into use controlled charging;
The threshold voltage that every battery is set in observation circuit is a, controlled constant-current phase is 1C, 0.5C, 0.2C, 0.1C, 0.05C, 0.02C, perhaps certain several successive stages wherein, the electric current constant-current control circuit just reduced charging current according to said sequence when any battery reached threshold voltage in battery pack, until the 0.02C constant current charge, all single batteries that arrive threshold voltage this moment begin to carry out the foreign current equilibrium, and the outside balanced resistance heat dissipation form of using is carried out equilibrium;
When the cell more than 2/3 carried out outside equalization operation in the battery pack, the charge closing device was finished charging process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100604020A CN101257220A (en) | 2007-12-27 | 2007-12-27 | Method for charging lithium ion batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100604020A CN101257220A (en) | 2007-12-27 | 2007-12-27 | Method for charging lithium ion batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101257220A true CN101257220A (en) | 2008-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100604020A Pending CN101257220A (en) | 2007-12-27 | 2007-12-27 | Method for charging lithium ion batteries |
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| CN (1) | CN101257220A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800344A (en) * | 2010-03-25 | 2010-08-11 | 江苏华富控股集团有限公司 | Charge method of lithium ion power storage battery |
| CN101807729A (en) * | 2010-03-31 | 2010-08-18 | 张家港睿能科技有限公司 | Power lithium battery and charging method of balance stage of series-connected group thereof |
| CN102185169A (en) * | 2011-04-13 | 2011-09-14 | 苏州星恒电源有限公司 | Charging method and charging device for lithium ion battery pack |
| CN104215910A (en) * | 2014-08-13 | 2014-12-17 | 钱亚琴 | Detection and diagnosis method for lithium ion battery pack |
| CN110534827A (en) * | 2019-08-23 | 2019-12-03 | 江西优特汽车技术有限公司 | A kind of charging method of series-connected cell group |
-
2007
- 2007-12-27 CN CNA2007100604020A patent/CN101257220A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800344A (en) * | 2010-03-25 | 2010-08-11 | 江苏华富控股集团有限公司 | Charge method of lithium ion power storage battery |
| CN101807729A (en) * | 2010-03-31 | 2010-08-18 | 张家港睿能科技有限公司 | Power lithium battery and charging method of balance stage of series-connected group thereof |
| CN101807729B (en) * | 2010-03-31 | 2012-11-14 | 张家港睿能科技有限公司 | Power lithium battery and charging method of balance stage of series-connected group thereof |
| CN102185169A (en) * | 2011-04-13 | 2011-09-14 | 苏州星恒电源有限公司 | Charging method and charging device for lithium ion battery pack |
| CN104215910A (en) * | 2014-08-13 | 2014-12-17 | 钱亚琴 | Detection and diagnosis method for lithium ion battery pack |
| CN110534827A (en) * | 2019-08-23 | 2019-12-03 | 江西优特汽车技术有限公司 | A kind of charging method of series-connected cell group |
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Open date: 20080903 |