CN1858958A - Equalizing charging circuit of power lithium ion cell - Google Patents
Equalizing charging circuit of power lithium ion cell Download PDFInfo
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- CN1858958A CN1858958A CN 200610044624 CN200610044624A CN1858958A CN 1858958 A CN1858958 A CN 1858958A CN 200610044624 CN200610044624 CN 200610044624 CN 200610044624 A CN200610044624 A CN 200610044624A CN 1858958 A CN1858958 A CN 1858958A
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- battery
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- self discharge
- batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
This invention discloses a balance charge circuit of a dynamic Li ionic battery, in which, in a cell set composed of multiple serial ionic charge batteries, either end of each cell is connected with a voltage test part comparing the voltage of said cell and the rating voltage of a designed single cell and outputting the comparison result and a self-discharging branch including an impedance element and a self-discharge control switch for controlling the off/on of the branch based on the comparison result, when charging, the balanced charging circuit can keep the voltage almost the same among the single cells to eliminate the influence to the charge keeping ability of the cell unit due to the performance difference among single cells and increase the entire performance of the cell set.
Description
Technical field
The present invention relates to the protective circuit of rechargeable battery, relate in particular to a kind of equalization charging circuit that is used for power lithium-ion battery.
Background technology
Lithium ion battery does not have memory effect, so be desirable rechargeable battery.When it uses as electrokinetic cell, when for example using, often need 7～13 joint lithium ion battery series connection are used, to reach the needed voltage of motor with its driving battery as electric bicycle.Because each monomer of lithium ion battery can not be in full accord on performance index, in use because the difference of capacity, self discharge between each monomer etc., accumulate over a long period, in use for some time, the retention of charge of battery pack obviously reduces, and influenced lithium ion battery applying in a wider context.Therefore, when the multiple batteries series connection was used, the quality of its performance not only depended on the quality of battery cell quality, the prior height that depends on its total quality.Regrettably, in known technology, do not find the protective circuit of the battery pack use of forming at the above lithium ion battery of four joints.
Summary of the invention
Technical problem to be solved by this invention is: the equalization charging circuit that a kind of power lithium-ion battery is provided, to solve when the multi-section lithium ion battery serial connection charge, owing to the performance difference between each battery cell influences the retention of charge of battery unit, reduce the problem of battery pack overall performance.
For solving the problems of the technologies described above, technical scheme of the present invention is: the equalization charging circuit of power lithium-ion battery, comprise by a pair of input/output port and be connected in the main circuit that the battery unit between the described a pair of input/output port is formed that described battery unit is the battery pack that is in series by the multi-section lithium ion rechargeable battery; The positive and negative end of described each batteries connects a voltage detection department that the rated voltage of the single battery of the voltage of a described batteries and setting can be compared and exports comparative result, the positive and negative end of described each batteries also connects a self discharge branch road, and described each self discharge branch road comprises an impedance component and the self discharge control switch that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section.
After having adopted technique scheme, the invention has the beneficial effects as follows: because described battery unit is the battery pack that is in series by the multi-section lithium ion rechargeable battery, be provided with a voltage detection department that the voltage and the setting voltage of this batteries can be compared and export comparative result between the both positive and negative polarity of described each batteries, also be provided with a self discharge branch road between the both positive and negative polarity of described each batteries, described each self discharge branch road comprises an impedance component and the self discharge control switch that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section, so, in charging process to battery unit, when if the virtual voltage of a certain batteries is higher than the rated voltage of single battery of setting, its corresponding voltage detection department will send high level, the self discharge control switch is communicated with, make this batteries in charging, carry out self discharging, thereby reduced the charging current of this batteries by the self discharge branch road; After charging finished, all batteries that are higher than the rated voltage of setting also can continue self discharging by corresponding self discharge branch road, until the rated voltage of reducing to setting, at this moment, voltage detection department will send low level, and the self discharge control switch disconnects the self discharge branch road, and self discharging stops.By self discharging, the voltage of each battery cell of charging back battery pack is consistent substantially, has eliminated because of the influence of the performance difference between each battery cell to the retention of charge of battery unit.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Accompanying drawing is the circuit theory diagrams of the embodiment of the invention.
Embodiment
The equalization charging circuit of power lithium-ion battery, as shown in drawings, battery unit 101 is the battery pack that are in series by the multi-section lithium ion rechargeable battery, positive terminal 102, negative terminal 103 and be connected positive terminal 102 and negative terminal 103 between battery unit 101 form main circuits.Positive terminal 102 and negative terminal 103 use as input/output port, and during charging, it is connected with negative pole with the positive pole of charger respectively, and during discharge, it is connected with load respectively.The positive and negative end of described each batteries connects a voltage detection department 31 that the rated voltage of the single battery of the voltage of a described batteries and setting can be compared and exports comparative result, and described voltage detection department 31 is made of differential circuit.The positive and negative end of described each batteries also connects a self discharge branch road, described each self discharge branch road comprises an impedance component 33 and the self discharge control switch 32 that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section 31, described self discharge control switch 32 is made of the MOSFET pipe, and the output of described voltage detection department 31 is connected with the grid of MOSFET pipe.
In charging process to battery unit 101, when if the virtual voltage of a certain batteries is higher than the rated voltage of single battery of setting, its corresponding voltage detection department 31 will send high level, self discharge control switch 32 is communicated with, make this batteries in charging, carry out self discharging, thereby reduced the charging current of this batteries by the self discharge branch road; After charging finished, all batteries that are higher than the rated voltage of setting also can continue self discharging by corresponding self discharge branch road, until the rated voltage of reducing to setting, at this moment, voltage detection department 31 will send low level, and self discharge control switch 32 disconnects the self discharge branch road, and self discharging stops.By self discharging, the voltage of each battery cell of charging back battery pack is consistent substantially, has eliminated because of the influence of the performance difference between each battery cell to the retention of charge of battery unit, has promoted the overall performance of battery pack.In the self discharging process, impedance component 33 can produce heats, illustrates that the self discharge branch road works.
Self discharge control switch 32 also can adopt other execution mode, for example self discharge control switch 32 also can adopt other electric-controlled switch elements such as triode, as long as it can just can be in connected sum disconnection two states respectively according to a high level and a low level.
The present invention is particularly suitable for being used by the electrokinetic cell that the above lithium ion battery of four joints is in series.
Claims (3)
1, the equalization charging circuit of power lithium-ion battery, comprise by a pair of input/output port and be connected in the main circuit that the battery unit (101) between the described a pair of input/output port is formed that it is characterized in that: described battery unit (101) is the battery pack that is in series by the multi-section lithium ion rechargeable battery; The positive and negative end of described each batteries connects a voltage detection department (31) that the rated voltage of the single battery of the voltage of a described batteries and setting can be compared and exports comparative result, the positive and negative end of described each batteries also connects a self discharge branch road, and described each self discharge branch road comprises an impedance component (33) and the self discharge control switch (32) that can control described self discharge branch road on/off according to the comparative result of correspondent voltage test section (31).
2, the equalization charging circuit of power lithium-ion battery as claimed in claim 1 is characterized in that: described voltage detection department (31) is made of differential circuit.
3, the equalization charging circuit of power lithium-ion battery as claimed in claim 1 or 2 is characterized in that: described self discharge control switch (32) is made of the MOSFET pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610044624 CN1858958A (en) | 2006-06-08 | 2006-06-08 | Equalizing charging circuit of power lithium ion cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610044624 CN1858958A (en) | 2006-06-08 | 2006-06-08 | Equalizing charging circuit of power lithium ion cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1858958A true CN1858958A (en) | 2006-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610044624 Pending CN1858958A (en) | 2006-06-08 | 2006-06-08 | Equalizing charging circuit of power lithium ion cell |
Country Status (1)
| Country | Link |
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| CN (1) | CN1858958A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101779355A (en) * | 2007-05-24 | 2010-07-14 | 张惇杰 | Rechargeable battery assembly and power system using same |
| CN101872991A (en) * | 2010-06-28 | 2010-10-27 | 惠州市亿能电子有限公司 | Balance control method of power battery pack |
| CN103904708A (en) * | 2012-12-26 | 2014-07-02 | 电能有限公司 | Lithium battery provided with overcharging protection device in case of series charging |
| CN105006603A (en) * | 2014-04-25 | 2015-10-28 | 电能有限公司 | Secondary assembled battery with overcharge and overdischarge device |
| US20210216429A1 (en) * | 2020-01-09 | 2021-07-15 | Asustek Computer Inc. | Diagnostic system |
-
2006
- 2006-06-08 CN CN 200610044624 patent/CN1858958A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101779355A (en) * | 2007-05-24 | 2010-07-14 | 张惇杰 | Rechargeable battery assembly and power system using same |
| CN101872991A (en) * | 2010-06-28 | 2010-10-27 | 惠州市亿能电子有限公司 | Balance control method of power battery pack |
| CN103904708A (en) * | 2012-12-26 | 2014-07-02 | 电能有限公司 | Lithium battery provided with overcharging protection device in case of series charging |
| CN105006603A (en) * | 2014-04-25 | 2015-10-28 | 电能有限公司 | Secondary assembled battery with overcharge and overdischarge device |
| CN105006603B (en) * | 2014-04-25 | 2017-10-20 | 电能有限公司 | Has the secondary Assembled battery of overcharge electric discharge device |
| US20210216429A1 (en) * | 2020-01-09 | 2021-07-15 | Asustek Computer Inc. | Diagnostic system |
| US11994970B2 (en) * | 2020-01-09 | 2024-05-28 | Asustek Computer Inc. | Diagnostic system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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