CN2922234Y - Over-discharge protecting circuit for power lithium ion cell - Google Patents

Over-discharge protecting circuit for power lithium ion cell Download PDF

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Publication number
CN2922234Y
CN2922234Y CN 200620085238 CN200620085238U CN2922234Y CN 2922234 Y CN2922234 Y CN 2922234Y CN 200620085238 CN200620085238 CN 200620085238 CN 200620085238 U CN200620085238 U CN 200620085238U CN 2922234 Y CN2922234 Y CN 2922234Y
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CN
China
Prior art keywords
voltage
discharging
overdischarge
cell
over
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.)
Expired - Fee Related
Application number
CN 200620085238
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Chinese (zh)
Inventor
刘振华
徐建华
王建武
高玉光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGHUA BATTERY CO Ltd WEIFANG
Original Assignee
GUANGHUA BATTERY CO Ltd WEIFANG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GUANGHUA BATTERY CO Ltd WEIFANG filed Critical GUANGHUA BATTERY CO Ltd WEIFANG
Priority to CN 200620085238 priority Critical patent/CN2922234Y/en
Application granted granted Critical
Publication of CN2922234Y publication Critical patent/CN2922234Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses an over-charging protecting circuit for power lithium ion cell, which comprises a pair of input and output ports and a cell, a discharging control switch arranged between one port of the input and output ports and the electrode of the cell, wherein, the cell comprises a plurality of series lithium ion charging cells. An over-discharging voltage test portion is arranged to compare the cell voltage and enactment voltage and output the comparison results. The output signal of the over-discharging voltage test portion is used to control the over-discharging logic control portion of the discharging control switch on/off. When voltage of any node of cell is lower than enacted discharging limit voltage or the voltage of the cell group is lower than enacted voltage, the over-discharging protecting circuit can automatically cut the discharging circuit and stop discharging, such that any node of cell can not be damaged by over-discharging in the a plurality of series lithium ion discharging cells charging process, thereby protecting the discharging safety of the cell, which is particularly suitable for the power cell of more than four nodes of series lithium ion cells.

Description

The over circuit of power lithium-ion battery
Technical field
The utility model relates to the over circuit of rechargeable battery, relates in particular to a kind of over circuit of 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.Connect when load,,, just may cause lithium ion excessively to take off embedding, thereby make short circuit between electrodes, influence battery capacity, life-span from negative pole in case there is a batteries to be in over-discharge state because the quality of every batteries can not be just the same.
Summary of the invention
Technical problem to be solved in the utility model is: provide a kind of over circuit of power lithium-ion battery, to solve when the series connection of multi-section lithium ion battery is used the problem that causes overdischarge to damage easily.
For solving the problems of the technologies described above, the technical solution of the utility model is: the over circuit of power lithium-ion battery, comprise a pair of input/output port and battery unit, be connected a port of described a pair of input/output port and an electric discharge between electrodes control switch of described battery unit, described battery unit is in series by the multi-section lithium ion rechargeable battery; This over circuit also comprises the overdischarge voltage detection department that the voltage and the setting voltage of battery can be compared and export comparative result, controls the overdischarge logic control portion of described discharge control switch on/off according to the output signal of described overdischarge voltage detection department.
As a kind of embodiment, described overdischarge voltage detection department comprises the positive and negative end that is connected described each batteries, the discharge deboost of this batteries of the virtual voltage of each batteries and setting can be compared and exports respectively a plurality of differential circuits of comparative result; Described overdischarge logic control portion comprises the overdischarge logical circuit that can carry out logical operation according to the input signal of described these differential circuits and the voltage signal of described overdischarge logical circuit output and voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting can be compared and exports the voltage comparator of comparative result.
As a kind of embodiment, described discharge control switch is made of the MOSFET pipe.
After having adopted technique scheme, the beneficial effects of the utility model are: because described battery unit is in series by the multi-section lithium ion rechargeable battery, the positive and negative end of every batteries is connected with a differential circuit respectively, each differential circuit compares the discharge deboost of this batteries of the virtual voltage of single battery and setting respectively, and comparative result imported the overdischarge logical circuit of overdischarge logic control portion respectively, the voltage comparator of overdischarge logic control portion compares the voltage signal of described overdischarge logical circuit output and comparative result is outputed to MOSFET and manages with a voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting.When the virtual voltage of each batteries all is higher than the discharge deboost of setting, differential circuit provides the virtual voltage of single battery to the overdischarge logical circuit, output to voltage comparator after the computing of these actual voltage signal through the overdischarge logical circuit, compare with a voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting, if be higher than this voltage, then send high level to the MOSFET pipe, MOSFET manages conducting, battery pack regular picture; If be lower than this voltage, then send low level to the MOSFET pipe, MOSFET manages disconnection, stops discharge; When the virtual voltage of any batteries is lower than the discharge deboost of setting, corresponding differential circuit will send low level to the overdischarge logical circuit, the overdischarge logical circuit through computing and voltage comparator relatively after, also send low level to the MOSFET pipe, disconnect discharge circuit, stop discharge, thereby when the series connection of multi-section lithium ion battery is used, any batteries can not be subjected to the damage of overdischarge, and when the voltage of whole Battery pack is lower than the voltage of a setting, discharge circuit also can automatic disconnection, because this setting voltage is lower than the discharge deboost sum of all single batteries of battery pack, so it can be when every batteries all reach the discharge deboost of setting, discharge circuit is disconnected, avoid battery pack under a nonsensical low-voltage, to work on, thereby make the use of battery pack safer and economical.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Accompanying drawing is the circuit theory diagrams of the utility model embodiment.
Embodiment
Accompanying drawing shows the general configuration of the over circuit 2 of an embodiment medium power lithium ion battery of the present utility model.This over circuit has as the positive terminal 102 of output port and negative terminal 103, 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.Battery unit 101 is the battery pack that are in series by the multi-section lithium ion rechargeable battery; Discharge control switch 105 is made of the MOSFET pipe, and discharge control switch 105 is connected between the negative pole and negative terminal 103 of battery unit 101.Be connected with a plurality of differential circuits 21 that the discharge deboost of this batteries of the virtual voltage of every batteries and setting can be compared and exports respectively comparative result at the positive and negative end of described each batteries, the quantity of differential circuit 21 is corresponding with described Li-Ion rechargeable battery quantity.The comparative result of all these differential circuits 21 is imported overdischarge logical circuit 22 respectively, the output of overdischarge logical circuit 22 connects a voltage comparator 23, voltage comparator 23 can compare voltage signal and voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting of overdischarge logical circuit 22 outputs, and this voltage can artificially be regulated.The output of voltage comparator 23 is connected with the grid of the MOSFET pipe that uses as discharge control switch 105.All these differential circuits 21 have constituted the overdischarge current detection section of over circuit 2, and overdischarge logical circuit 22 and voltage comparator 23 have constituted the overdischarge logic control part of over circuit 2.
When the virtual voltage of each batteries all is higher than the discharge deboost of setting, differential circuit 21 provides the virtual voltage of single battery to overdischarge logical circuit 22, output to voltage comparator 23 after the computing of these actual voltage signal through overdischarge logical circuit 22, compare with a voltage that is equivalent to described a plurality of discharge deboost sums that is lower than setting, if be higher than this voltage, then send high level to the MOSFET pipe, MOSFET manages conducting, battery pack regular picture; If be lower than this voltage, then send low level to the MOSFET pipe, MOSFET manages disconnection, stops discharge; When the virtual voltage of any batteries is lower than the discharge deboost of setting, corresponding differential circuit 21 will send low level to overdischarge logical circuit 22, after 22 process computings of overdischarge logical circuit and voltage comparator 23 compare, also send low level to the MOSFET pipe, disconnect discharge circuit, stop discharge, thereby when battery power discharge, any batteries can not be subjected to the damage of overdischarge, and when the voltage of whole Battery pack is lower than the voltage of a setting, discharge circuit also can automatic disconnection, because this setting voltage is lower than the discharge deboost sum that all single batteries of battery pack are set, so it can be when every batteries all reach the discharge deboost of setting, circuit is disconnected, avoid battery pack under a nonsensical low-voltage, to work on, thereby make the use of battery pack safer and economical.
The utility model is particularly suitable for being used by the electrokinetic cell that the above lithium ion battery of four joints is in series.

Claims (4)

1, the over circuit of power lithium-ion battery, comprise a pair of input/output port and battery unit, be connected a port of described a pair of input/output port and an electric discharge between electrodes control switch of described battery unit, 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; This over circuit also comprises the overdischarge voltage detection department that the voltage and the setting voltage of battery can be compared and export comparative result, controls the overdischarge logic control portion of described discharge control switch (105) on/off according to the output signal of described overdischarge voltage detection department.
2, the over circuit of power lithium-ion battery as claimed in claim 1 is characterized in that: described overdischarge voltage detection department comprises the positive and negative end that is connected described each batteries, the discharge deboost of this batteries of the virtual voltage of each batteries and setting can be compared and exports respectively a plurality of differential circuits (21) of comparative result.
3, the over circuit of power lithium-ion battery as claimed in claim 2 is characterized in that: described overdischarge logic control portion comprises the overdischarge logical circuit (22) that can carry out logical operation according to the input signal of described these differential circuits (21) and the voltage that is equivalent to described a plurality of discharge deboost sums of the voltage signal of described overdischarge logical circuit (22) output and a setting can be compared and exports the voltage comparator (23) of comparative result.
4, as the over circuit of described any power lithium-ion battery of claim 1 to 3, it is characterized in that: described discharge control switch (105) is made of the MOSFET pipe.
CN 200620085238 2006-06-08 2006-06-08 Over-discharge protecting circuit for power lithium ion cell Expired - Fee Related CN2922234Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200620085238 CN2922234Y (en) 2006-06-08 2006-06-08 Over-discharge protecting circuit for power lithium ion cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200620085238 CN2922234Y (en) 2006-06-08 2006-06-08 Over-discharge protecting circuit for power lithium ion cell

Publications (1)

Publication Number Publication Date
CN2922234Y true CN2922234Y (en) 2007-07-11

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CN (1) CN2922234Y (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101814726A (en) * 2010-04-14 2010-08-25 罗康林 Battery discharge prevention circuit
CN102842896A (en) * 2012-09-29 2012-12-26 上海空间电源研究所 Over-discharge protection control system for lithium ion storage battery and over-discharge protection method thereof
CN102165626B (en) * 2008-09-25 2014-05-14 Nec能源元器件株式会社 Multiple series/multiple parallel battery pack
US9281540B2 (en) 2009-12-09 2016-03-08 Microvast Power Systems Co., Ltd. Lithium-ion battery comprising an ion-selective conducting layer
CN110138056A (en) * 2019-06-27 2019-08-16 深圳莱福德科技股份有限公司 Emergency power supply guard method and device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102165626B (en) * 2008-09-25 2014-05-14 Nec能源元器件株式会社 Multiple series/multiple parallel battery pack
US9281540B2 (en) 2009-12-09 2016-03-08 Microvast Power Systems Co., Ltd. Lithium-ion battery comprising an ion-selective conducting layer
CN101814726A (en) * 2010-04-14 2010-08-25 罗康林 Battery discharge prevention circuit
CN102842896A (en) * 2012-09-29 2012-12-26 上海空间电源研究所 Over-discharge protection control system for lithium ion storage battery and over-discharge protection method thereof
CN102842896B (en) * 2012-09-29 2014-11-26 上海空间电源研究所 Over-discharge protection control system for lithium ion storage battery and over-discharge protection method thereof
CN110138056A (en) * 2019-06-27 2019-08-16 深圳莱福德科技股份有限公司 Emergency power supply guard method and device

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GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee