CN201556681U - Lithium battery charging management circuit - Google Patents
Lithium battery charging management circuit Download PDFInfo
- Publication number
- CN201556681U CN201556681U CN2009202961421U CN200920296142U CN201556681U CN 201556681 U CN201556681 U CN 201556681U CN 2009202961421 U CN2009202961421 U CN 2009202961421U CN 200920296142 U CN200920296142 U CN 200920296142U CN 201556681 U CN201556681 U CN 201556681U
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- Prior art keywords
- charging
- battery
- control unit
- mcu main
- voltage
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a lithium battery charging management circuit, which is connected with a charger via a charging interface and connected with two electrodes of each battery cell forming a lithium battery pack. The circuit comprises a front-end acquisition unit, an MCU main control unit and a charging control unit, wherein the front-end acquisition battery is used for acquiring voltage and temperature parameters of each battery cell and then transmitting the parameters to the MCU main control unit, the MCU main control unit is used for realizing system control and charging management, and the charging control unit is connected with the MCU main control unit and controlled by PWM signals sent by the MCU main control unit so as to control work of the external charger. The charging management circuit adopting a single-cell voltage feedback form effectively avoids defects of charging management referred to voltage of Pack+ and Pack- of two electrodes of the lithium battery pack, and when voltage of a certain battery cell reaches the limit value during the charging process, the MCU adjusts instructs to reduce charging current so as to avoid battery voltage out of limit, thereby ensuring safety of the lithium batter while increasing charging efficiency.
Description
Technical field
The utility model relates to the li-ion cell protection technical field, is specifically related to a kind of charge management circuit that is applied to the lithium battery on the electric bicycle.
Background technology
At present; conventional electric bicycle lithium battery bag only has the li-ion cell protection function; the simple equalization function of minority lithium battery bag support; usually such protection system is called the li-ion cell protection plate; the Charge Management of battery is then finished by the charger of outside; charger is fairly simple with being connected of power brick, promptly is connected with the Pack-terminal by Pack+.Its charging process generally is a first constant current constant voltage again, and promptly thinking about 0.01C charges finishes when the constant voltage process electric current is reduced to.For the power brick of brownout, generally can carry out trickle precharge earlier, carry out normal charge again after waiting cell voltage to be increased to safe voltage, Voltage Feedback is only taken from Pack+, Pack-, i.e. assembled battery total voltage.The shortcoming of this Charge Management only is the port voltage of battery pack is fed back, and under the situation, this charging modes can get a desired effect electric core consistency preferably in battery pack; And when the consistency variation of battery; the voltage of certain economize on electricity core has reached voltage limiting value in advance in charging process, baffle damages for fear of over-charge of lithium battery, can cut off charge circuit; but this moment, other electric cores may also not be full of, and caused battery voltage not reach the charger set point.
The utility model content
The problem that the utility model need solve provides a kind of lithium cell charging management circuit, and this circuit is monitored respectively and managed at each electric core of inside battery, provides perfect, accurate protection to the various states of battery.
For addressing the above problem, the basic technical scheme that the utility model is taked is: a kind of lithium cell charging management circuit is provided, and it connects charger by charging inlet, and is located at lithium battery bag inside, all be connected with each battery battery core the two poles of the earth of forming the lithium battery bag, this circuit comprises:
The front-end collection unit is used to gather each electric core voltage of battery, temperature parameter and is transferred to following MCU Main Processing Unit; MCU Main Processing Unit, control of realization system and Charge Management; Charging control unit is connected with above-mentioned MCU Main Processing Unit, is controlled by the pwm signal control external charger work that MCU Main Processing Unit sends; Be provided with two-way pwm signal passage in the described circuit, the one tunnel is standby.
Compared with prior art, the beneficial effects of the utility model are: described charge management circuit adopts integrated chip to gather each electric core parameter of battery respectively, judge charged state and charging process controlled with each electric core parameter of battery, only effectively avoid with lithium battery bag the two poles of the earth Pack+, Pack-voltage be with reference to the time carry out the drawback of Charge Management; In this manner, Voltage Feedback is adjusted into the single-unit Voltage Feedback from whole group of Voltage Feedback before, when certain economize on electricity core voltage reaches amplitude limit value in charging process, MCU promptly adjusts instruction reduction charging current and avoids cell voltage to transfinite, guarantee the safety of lithium battery, improved charge efficiency simultaneously.
Description of drawings
Fig. 1 is described charge management circuit schematic block diagram.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is described charge management circuit principle schematic.As figure, described lithium cell charging management circuit, comprise the front-end collection unit 11 that is used to gather each electric core voltage of battery, temperature parameter, according to collect each electric core voltage of battery, temperature parameter carry out the MCU Main Processing Unit 10 of system control and Charge Management, be controlled by MCU Main Processing Unit, receive the charging control unit 12 of pwm signal control external charger work.Described front-end collection unit 11 adopts powerful integrated chip OZ890, and it connects MCU by serial ports, carries out data passes with it.Described charging control unit 12 adopts optic coupling element, and the optic coupling element input receives the MCU signal, and output connects external charger.Be provided with two-way in the circuit described in the utility model and isolate PWM output, wherein one the tunnel is used for charging current instruction transmission, and another road is reserved.
The method of work of above-mentioned lithium cell charging management circuit is: behind the MCU power-up initializing, read OZ890 configuration parameter and system parameters after, judge system mode.If system's decision circuitry is in discharge condition or idle condition, then to reduce the power consumption of MCU and OZ890 and enter circular wait, MCU can be by reducing crystal oscillator frequency and then reducing the speed of service to reach low-power consumption this moment; If system's decision circuitry is in malfunction, recording status information then, and OZ890 is carried out the corresponding operating of corresponding fault.
If after system's decision circuitry is in charged state, enter Charge Management.Promptly by collection and analysis to each electric core voltage data of battery, MCU determines charging current according to battery status by the lithium battery main control unit, by the PWM mode current-order is sent to charger, charger is exported according to the requirement of lithium battery main control unit fully.When certain economize on electricity core voltage reached amplitude limit value earlier in charging process, MCU promptly adjusted instruction reduction charging current and avoids cell voltage to transfinite, but still continues battery pack is charged, and prevents that the low battery battery core of other electric weight can't be full of.This Charge Management mode has been guaranteed the safety of lithium battery, has improved charge efficiency simultaneously.
Need to prove that above-mentioned only is preferred implementation of the present utility model,, all should belong to protection range of the present utility model not breaking away under the utility model design prerequisite its any minor variations of doing and being equal to replacement.
Claims (3)
1. the lithium cell charging management circuit connects charger by charging inlet, and it is characterized in that: it is located at lithium battery bag inside, and all is connected with each battery battery core the two poles of the earth of forming the lithium battery bag, comprises
The front-end collection unit is used to gather each electric core voltage of battery, temperature parameter and is transferred to following MCU Main Processing Unit;
MCU Main Processing Unit, control of realization system and Charge Management;
Charging control unit is connected with above-mentioned MCU Main Processing Unit, is controlled by the pwm signal control external charger work that MCU Main Processing Unit sends.
2. lithium cell charging management circuit according to claim 1 is characterized in that: described front-end collection unit adopts integrated chip 0Z890.
3. lithium cell charging management circuit according to claim 1 is characterized in that: be provided with two-way pwm signal passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202961421U CN201556681U (en) | 2009-12-31 | 2009-12-31 | Lithium battery charging management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202961421U CN201556681U (en) | 2009-12-31 | 2009-12-31 | Lithium battery charging management circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201556681U true CN201556681U (en) | 2010-08-18 |
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ID=42616370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202961421U Expired - Lifetime CN201556681U (en) | 2009-12-31 | 2009-12-31 | Lithium battery charging management circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201556681U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932749A (en) * | 2016-06-24 | 2016-09-07 | 浙江中马园林机器股份有限公司 | Special lithium battery power supply device for garden tool |
-
2009
- 2009-12-31 CN CN2009202961421U patent/CN201556681U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932749A (en) * | 2016-06-24 | 2016-09-07 | 浙江中马园林机器股份有限公司 | Special lithium battery power supply device for garden tool |
| CN105932749B (en) * | 2016-06-24 | 2018-07-17 | 浙江中马园林机器股份有限公司 | A kind of special lithium battery power supply device of garden instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Fei Inventor after: Ruan Xusong Inventor after: Deng Jie Inventor before: Feng Daming Inventor before: Liu Fei Inventor before: Ruan Xusong Inventor before: Zhang Weige Inventor before: Wang Zhanguo Inventor before: Deng Jie |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: FENG DAMING LIU FEI RUAN XUSONG ZHANG WEIGE WANG ZHANGUO DENG JIE TO: LIU FEI RUAN XUSONG DENG JIE |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100818 |
|
| CX01 | Expiry of patent term |