CN102122812A - Over-charging protective device for rechargeable battery - Google Patents
Over-charging protective device for rechargeable battery Download PDFInfo
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- CN102122812A CN102122812A CN2009102140994A CN200910214099A CN102122812A CN 102122812 A CN102122812 A CN 102122812A CN 2009102140994 A CN2009102140994 A CN 2009102140994A CN 200910214099 A CN200910214099 A CN 200910214099A CN 102122812 A CN102122812 A CN 102122812A
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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)
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- Protection Of Static Devices (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
The invention discloses an over-charging protective device for a rechargeable battery, which comprises a detection circuit, a charge control circuit, a balance control circuit and a protection chip. Input ends of the detection circuit and the protection chip are respectively connected with the battery so as to detect a voltage of the battery and respectively output different detection signals. An input end of the charge control circuit is connected with an output end of the protection chip and carries out low-speed charging operation according to the corresponding detection signal. The balance control circuit is connected with an output end of the detection circuit and starts and carries out balanced charging operation according to the corresponding detection signal. By the over-charging protective device, the conversion from large-current high-speed charging to small-current low-speed charging of the battery is realized, meanwhile, the voltages and the capacities among a plurality of batteries are balanced, and the battery is prevented from being overcharged, so that the service life of the battery is prolonged and the safety and reliability of the battery are improved.
Description
Technical field
The present invention relates to a kind of rechargeable battery set control circuit, relate in particular to a kind of additives for overcharge protection device of rechargeable battery.
Background technology
Existing lithium ion battery as high capacity rechargeable battery, it is owing to there not being memory effect to become desirable rechargeable battery.When lithium ion battery applications is in power products such as electronic product, motor or vehicle, often need the series connection of multi-section lithium ion battery is used, to reach the required voltage of power product.For example, on notebook computer, adopt 3～4 joint lithium ion batteries to be together in series usually and form the battery system of 11.1V or 14.8V.Yet, series-connected cell is inevitably because voltage, the electrical characteristic difference of battery cell, the voltage and the capacity that each battery in every group of series-connected cell can occur are all variant, this species diversity can become more and more obvious after through charge and discharge cycles repeatedly, thereby has a strong impact on the life-span and the reliability of series-connected cell system.When especially adopting quick charger commonly used at present to charge, this kind influence is more obvious.The charging that continues big electric current causes very easily that wherein some cell voltage is too high, is in the state of overcharging for a long time, and other cell voltages then can't be full of.Like this, make the capacity integral body of whole series-connected cell descend.And, can cause the battery that overcharges aging phenomenon to occur, the life-span reduces greatly.
So, based on this problem, in the multiple batteries series system, generally can increase balance control circuit usually, with the voltage between the monomer electricity core in the every Battery pack of balance, improve the cycle life and the reliability of battery system.
Please refer to Fig. 1; the additives for overcharge protection device 3 of the present rechargeable battery of using always; the general balance control circuit that adopts 100 is for adopting passive balance mode; i.e. a resistance in parallel and a switch on every economize on electricity core; switch is by balance control circuit 100 controls, and balance control circuit 100 can be monitored the voltage of every economize on electricity core, behind the electric voltage exception of finding one of them electric core; promptly split to close and control, thus the action of control charging control circuit 200.Be specially, if when finding the overtension of one of them electric core, will with the switch closure of this electricity core parallel connection, then, the charging current of understanding some is bypassed by corresponding resistance, thereby slows down the charging rate of this electricity core.
This kind passive equilibrium mode can realize certain counterbalance effect, yet, its unnecessary energy (the electric core that voltage is high has been stored excess energy) all consumes by the mode of balance resistance with heat energy, poor effect, and cause the balance resistance excessive heating easily, cause that temperature was too high when battery used, fail safe is not good enough.
Summary of the invention
The objective of the invention is to provide a kind of additives for overcharge protection device of rechargeable battery at above-mentioned the deficiencies in the prior art; it can realize that battery goes to little electric current by big electric current quick charge and charges at a slow speed; thereby voltage between the balance multiple batteries and capacity; prevent over-charging of battery, thereby prolong the useful life of battery and the security reliability of raising battery.
For achieving the above object, the additives for overcharge protection device of rechargeable battery of the present invention comprises testing circuit, charging control circuit, balance control circuit and protection chip.The input of described testing circuit and described protection chip is connected with battery respectively, so that cell voltage is detected, and exports different detection signals respectively.The input of described charging control circuit is connected with the output of described protection chip, and according to the action of charging at a slow speed of corresponding described detection signal.Described balance control circuit is connected with the output of described testing circuit, and according to the action of corresponding described detection signal startup carrying out equilibrium charging.
As mentioned above; the additives for overcharge protection device of rechargeable battery of the present invention can make rechargeable battery in the quick charge of carrying out big electric current; after its voltage reaches certain value; balance control circuit starts according to the relevant detection signal; and make charging control circuit enter the charging at a slow speed of little electric current; thereby make charge mode transfer low current charge to from large current charge; make that higher voltage batteries continues consumed energy in the battery pack; other batteries then carry out low current charge to continue to increase energy; thereby voltage and capacity between the more piece rechargeable battery are tended to balance; prevent battery supersaturation charging, thereby prolonged the useful life of battery and the security reliability of raising battery.
Description of drawings
Fig. 1 is a kind of additives for overcharge protection schematic representation of apparatus of traditional rechargeable battery.
Fig. 2 is the schematic diagram of an embodiment of the additives for overcharge protection device of rechargeable battery of the present invention.
Fig. 3 is the detailed maps of the additives for overcharge protection device of rechargeable battery as shown in Figure 2.
Fig. 4 is the circuit diagram of the additives for overcharge protection device of rechargeable battery as shown in Figure 3.
Fig. 5 is the action schematic diagram of balance control circuit of the over-charge protective device of rechargeable battery as shown in Figure 4.
Fig. 6 is the schematic diagram of another embodiment of the additives for overcharge protection device of rechargeable battery of the present invention.
Fig. 7 is the circuit diagram of the additives for overcharge protection device of rechargeable battery as shown in Figure 6.
Each description of reference numerals is as follows among the figure:
The additives for overcharge protection device 1,2 of rechargeable battery
Charging control circuit 20 quick charge control switchs 21
Charging control switch 23 control switchs 25 at a slow speed
Optical coupling switching circuit 70 light-emitting diodes 71
Transistor 73 P type field effect transistor Q5-Q7
N type field effect transistor Q8, the Q9 first output CHG
The second output PF current-limiting resistance R1
Power consumption resistance R 2
Embodiment
For describing technology contents of the present invention, the purpose of being reached and effect in detail, described in detail below in conjunction with embodiment and conjunction with figs..
See also Fig. 2-Fig. 4, first embodiment of the additives for overcharge protection device 1 of rechargeable battery of the present invention comprises testing circuit 10, charging control circuit 20, balance control circuit 30 and protection chip 50.Wherein, testing circuit 10 is respectively applied for protection chip 50 and detects the voltage condition between multiple batteries and export different detection signals; charging control circuit 20 is connected with protection chip 50; and according to the action of charging at a slow speed of relevant detection signal; balance control circuit 30 is connected with testing circuit 10, and carries out the equilibrium charging action according to the relevant detection signal enabling.
As shown in the figure, testing circuit 10 comprises differential amplifier circuit 11, comparison circuit 13 and reference voltage source 15.In the present embodiment, this reference voltage source 15 adopts the TL431 chip, and its comparison circuit 13 for testing circuit 10 provides a reference voltage value, and this reference voltage value can artificially be regulated.Differential amplifier circuit 11 comprises some differential amplifiers, comparison circuit 13 comprises some comparators, the number of differential amplifier and comparator is because of the different respective settings of joint number of rechargeable battery, and in the present embodiment, the number of rechargeable battery, differential amplifier and comparator is 4.Two inputs of differential amplifier are connected with two batteries respectively, and to compare the voltage difference between two batteries, the output of differential amplifier is connected with an input of comparator, so that the comparative result of differential amplifier is delivered to comparator.Another input and the reference voltage source 15 of comparator join, and comparator compares the voltage as a result and the reference voltage value of differential amplifier output, and exports different detection signals.Particularly, if differential amplifier output voltage is lower than reference voltage value as a result the time, then comparison circuit 13 cuts out balance control circuit 30, if differential amplifier output voltage is higher than reference voltage value as a result the time, then comparison circuit 13 starts balance control circuits 30.
Particularly, this quick charge control switch 21 is connected with the first output CHG and the battery of protection chip 50 respectively, and particularly, this quick charge control switch 21 comprises P type field effect transistor Q6 and diode.This P type field effect transistor Q6 is according to the detection signal of the first output CHG output of protection chip 50 and conducting, thereby starts quick charge control switch 21, battery is carried out the quick charge action of big electric current.Wherein, this protection chip 50 is connected with the grid of the P type field effect transistor Q6 of quick charge control switch 21, with the conducting of controlling P type field effect transistor Q6 and end.
This at a slow speed charging control switch 23 comprise P type field effect transistor Q5 and diode.Charging control circuit 20 also comprises a current-limiting resistance R1, current-limiting resistance R1 with this at a slow speed charging control switch 23 be connected, if at a slow speed during charging control switch 23 conductings, current-limiting resistance R1 restriction charging current and provide low current to rechargeable battery.The periphery of two charging control switches 21,23 also has elements such as electric capacity, resistance, fuse, diode.
The input of this control switch 25 is connected with the second output PF of protection chip 50, and the output of control switch 25 is connected with charging control switch 23 at a slow speed, to control this conducting of charging control switch 23 at a slow speed.Concrete description sees also hereinafter.
In the present embodiment, balance control circuit 30 comprises some Balance Control unit, and correspondingly, the number of Balance Control unit is 4, is provided with a Balance Control unit between per two joint rechargeable batteries.Each Balance Control unit is formed by P type field effect transistor, diode and power consumption resistance R 2.The grid of the P type field effect transistor of each Balance Control unit all is connected with the output of corresponding comparison circuit 13, connects by corresponding drain electrode and emitter-base bandgap grading between the P type field effect transistor.
Particularly; control switch 25 comprises P type field effect transistor Q7 and N type field effect transistor Q8; the emitter-base bandgap grading of P type field effect transistor Q7 is connected with reference voltage source 15; grid is connected with the second output PF of protection chip 50; to receive the detection signal of the second output PF, drain electrode then is connected with the grid of N type field effect transistor Q8.The drain electrode of N type field effect transistor Q8 is connected with the grid of the P type field effect transistor Q5 of charging control switch 23 at a slow speed, thereby starts charging control switch 23 at a slow speed, so that battery enters the action of charging at a slow speed of low current.
On the one hand, thereby protect chip 50 to be connected and obtain the voltage that respectively saves rechargeable battery with rechargeable battery, when if wherein the voltage of a batteries is higher than reference voltage value, the first output CHG output detection signal of protection chip 50, make connected quick charge control switch 21 enter cut-off state, that is, the quick charge path is disconnected; On the other hand, control switch 25 is connected with charging control switch 23 at a slow speed, P type field effect transistor Q7 and N type field effect transistor Q8 conducting in succession, thus conducting charging control switch 23 at a slow speed makes battery enter charged state at a slow speed.At this moment, charge mode transfers low current charge to by large current charge.
See also Fig. 4 and Fig. 5, the working condition when now illustrating the startup of balance control circuit 30 of the present invention.When if testing circuit 10 is higher than reference voltage value with the voltage of protecting chip 50 to detect the 3rd batteries respectively; testing circuit 10 and protection chip 50 difference output detection signals; the detection signal of protection chip 50 outputs is disconnected the quick charge path; charge path is switched at a slow speed; at this moment; charge mode transfers low current charge to by large current charge; and little charging current is provided for batteries; the detection signal of testing circuit 10 outputs makes the Balance Control cell conduction that is connected between the 3rd batteries and second batteries; and other Balance Control cell conduction disconnects; so; little charging current is with each batteries of flowing through respectively; because Balance Control cell conduction; the 3rd batteries also can balance control unit by output current; when the 3rd batteries output current balanced control unit, the power consumption resistance R 2 that this electric current will be balanced control unit consumed (shown in Fig. 5 arrow).So the 3rd batteries will continue consumed energy, and continuing to increase energy with low current charge, other batteries make voltage and capacity between the more piece rechargeable battery tend to balance, prevent battery supersaturation charging, thereby prolonged the useful life of battery and the security reliability of raising battery.
Fig. 6, Fig. 7 are the schematic diagram of second embodiment of the additives for overcharge protection device 2 of charging circuit of the present invention.In the present embodiment, the additives for overcharge protection device 2 of this charging circuit also comprises optical coupling switching circuit 70.This coupling light switching circuit 70 comprises light-emitting diode 71 and transistor 73.Whether light-emitting diode 71 is electrically coupled to the output of balance control circuit 30, luminous in order to the signal deciding according to balance control circuit 30.And transistor 73 is electrically coupled to control switch 25, and according to the whether luminous impedance that determines transistor 73 of light-emitting diode 71, and makes control switch 25 conductings or end.
Particularly, this control switch 25 is N type field effect transistor Q9, and this N type field effect transistor Q9 links to each other with charging control circuit 20 and protection chip 50 respectively.Particularly, in the present embodiment, this protection chip 50 is the S-8254 chip.Wherein, the grid of N type field effect transistor Q9 is connected with the output of optical coupling switching circuit 70; drain electrode is connected with quick charge control switch 21; then charging control switch 23 is connected emitter-base bandgap grading with protecting chip 50 to reach at a slow speed respectively, transfers charged state at a slow speed in order to control charging control circuit 20 to by quick-charge state.
At the charging initial stage, quick charge control switch 21 is in conducting state.When balance control circuit 30 was activated because of receiving comparison circuit 13 relevant detection signals, the signal of its output was delivered to optical coupling switching circuit 70, and optical coupling switching circuit 70 starts thereupon, and makes control switch 25, and promptly N type field effect transistor Q9 ends.At this moment, N type field effect transistor Q9 makes the quick charge control switch 21 that joins with its drain electrode end, and 23 conductings of charging control switch at a slow speed of joining with its emitter-base bandgap grading, thereby make battery enter the trickle charge charged state.At this moment, charge mode transfers low current charge to from large current charge, make the lower battery of energy carry out charging work, the higher battery of energy carries out power consumption work, make voltage, the capacity of each battery tend to balance, prevent the supersaturation charging of battery, thereby prolonged the useful life of battery and the security reliability of raising battery.
In sum; the additives for overcharge protection device 1 of rechargeable battery of the present invention; 2 can make rechargeable battery after the quick charge of carrying out big electric current; balance control circuit 30 starts and the quick charge control switch 21 of charging control circuit 20 is ended; and conducting charging control switch 23 at a slow speed; thereby enter the charging at a slow speed of little electric current; thereby make charge mode transfer low current charge to from large current charge; and the startup of balance control circuit 30; make that higher voltage batteries continues consumed energy in the battery pack; other batteries then carry out low current charge to continue to increase energy; thereby voltage and capacity between the more piece rechargeable battery are tended to balance; prevent battery supersaturation charging, thereby prolonged the useful life of battery and the security reliability of raising battery.
Claims (8)
1. the additives for overcharge protection device of a rechargeable battery is characterized in that, comprising: testing circuit, charging control circuit, balance control circuit and protection chip;
The input of described testing circuit and described protection chip is connected with battery respectively, so that cell voltage is detected, and exports different detection signals respectively;
The input of described charging control circuit is connected with the output of described protection chip, and according to the action of charging at a slow speed of corresponding described detection signal;
Described balance control circuit is connected with the output of described testing circuit, and according to the action of corresponding described detection signal startup carrying out equilibrium charging.
2. the additives for overcharge protection device of rechargeable battery as claimed in claim 1; it is characterized in that: described testing circuit comprises differential amplifier circuit, comparison circuit and reference voltage source; described differential amplifier circuit is connected with battery; in order to compare the voltage difference between the battery; the input of described comparison circuit is connected with the output and the described reference voltage source of differential amplifier circuit respectively, and the output of described comparison circuit is connected with the input of described balance control circuit.
3. the additives for overcharge protection device of rechargeable battery as claimed in claim 2 is characterized in that: described charging control circuit comprises quick charge control switch, charging control switch at a slow speed, and described quick charge control switch is connected with the output of described protection chip.
4. the additives for overcharge protection device of rechargeable battery as claimed in claim 3; it is characterized in that: described charging control circuit also comprises control switch; the input of described control switch is connected with the output of described protection chip; the output of described control switch is connected with described charging control switch at a slow speed, thereby controls the turn-on action of described charging control switch at a slow speed.
5. the additives for overcharge protection device of rechargeable battery as claimed in claim 4; it is characterized in that: described control switch is connected with described protection chip; the output of described control switch is connected with described quick charge control switch, thereby and controls ending of described quick charge control switch according to the detection signal of described protection chip and move.
6. the additives for overcharge protection device of rechargeable battery as claimed in claim 5; it is characterized in that: also comprise the optical coupling switching circuit; the input of described optical coupling switching circuit is coupled to the output of described balance control circuit, and the output of described optical coupling switching circuit is connected with the input of described control switch.
7. the additives for overcharge protection device of rechargeable battery as claimed in claim 1 is characterized in that: described balance control circuit comprises P type field effect transistor, diode and power consumption resistance.
8. the additives for overcharge protection device of rechargeable battery as claimed in claim 4, it is characterized in that: described control switch comprises N type field effect transistor.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102140994A CN102122812A (en) | 2009-12-18 | 2009-12-18 | Over-charging protective device for rechargeable battery |
| TW098143784A TW201123680A (en) | 2009-12-18 | 2009-12-18 | Overcharge protection device for batteries |
| JP2010003703A JP2011147203A (en) | 2009-12-18 | 2010-01-12 | Overcharge protection device of charging battery |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102140994A CN102122812A (en) | 2009-12-18 | 2009-12-18 | Over-charging protective device for rechargeable battery |
| TW098143784A TW201123680A (en) | 2009-12-18 | 2009-12-18 | Overcharge protection device for batteries |
| JP2010003703A JP2011147203A (en) | 2009-12-18 | 2010-01-12 | Overcharge protection device of charging battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102122812A true CN102122812A (en) | 2011-07-13 |
Family
ID=49883571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102140994A Pending CN102122812A (en) | 2009-12-18 | 2009-12-18 | Over-charging protective device for rechargeable battery |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2011147203A (en) |
| CN (1) | CN102122812A (en) |
| TW (1) | TW201123680A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2798715A4 (en) * | 2011-12-29 | 2015-05-13 | Shenzhen Byd Auto R & D Co Ltd | BATTERY PROTECTION CHIP, AND BATTERY PROTECTION CHIP BALANCER CONTROL DEVICE |
| CN105091724A (en) * | 2015-03-05 | 2015-11-25 | 浙江吉利罗佑发动机有限公司 | LVDT measuring head rapid calibration tool and calibration method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013046433A (en) * | 2011-08-22 | 2013-03-04 | Seiko Instruments Inc | Cell balance device and battery system |
| US8901888B1 (en) | 2013-07-16 | 2014-12-02 | Christopher V. Beckman | Batteries for optimizing output and charge balance with adjustable, exportable and addressable characteristics |
| JP6132240B2 (en) * | 2013-07-02 | 2017-05-24 | パナソニックＩｐマネジメント株式会社 | Storage battery system and control device |
| CN107512185B (en) * | 2017-08-28 | 2023-05-23 | 南京工业职业技术学院 | Intelligent electric power-assisted vehicle charger |
| CN111725866B (en) * | 2020-06-12 | 2025-01-14 | 佛山市佳盈电池有限公司 | A battery double-layer protection circuit and battery device |
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| JP2000106220A (en) * | 1998-07-27 | 2000-04-11 | Sanyo Electric Co Ltd | Method for balancing charging amount of secondary battery |
| JP2002170599A (en) * | 2000-11-30 | 2002-06-14 | Shin Kobe Electric Mach Co Ltd | Monitoring device, control device and battery module |
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| CN101286646A (en) * | 2007-04-13 | 2008-10-15 | 宏碁股份有限公司 | Charging device for portable device |
| JP2009071964A (en) * | 2007-09-12 | 2009-04-02 | Rohm Co Ltd | CHARGE CONTROL CIRCUIT AND ELECTRONIC DEVICE USING THE SAME |
| CN100499248C (en) * | 2003-09-17 | 2009-06-10 | 精工电子有限公司 | Charging and discharging control circuit and charging type power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009247195A (en) * | 2008-03-31 | 2009-10-22 | O2 Micro Inc | Battery management system with adjustable charging current |
| TWI377758B (en) * | 2008-06-20 | 2012-11-21 | Green Solution Tech Co Ltd | The battery charging controller and battery module thereof |
-
2009
- 2009-12-18 TW TW098143784A patent/TW201123680A/en unknown
- 2009-12-18 CN CN2009102140994A patent/CN102122812A/en active Pending
-
2010
- 2010-01-12 JP JP2010003703A patent/JP2011147203A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000106220A (en) * | 1998-07-27 | 2000-04-11 | Sanyo Electric Co Ltd | Method for balancing charging amount of secondary battery |
| JP2002170599A (en) * | 2000-11-30 | 2002-06-14 | Shin Kobe Electric Mach Co Ltd | Monitoring device, control device and battery module |
| CN100499248C (en) * | 2003-09-17 | 2009-06-10 | 精工电子有限公司 | Charging and discharging control circuit and charging type power supply device |
| CN101262079A (en) * | 2007-03-07 | 2008-09-10 | 凹凸电子（武汉）有限公司 | Battery management systems, battery pack and battery pack charging method |
| CN101286646A (en) * | 2007-04-13 | 2008-10-15 | 宏碁股份有限公司 | Charging device for portable device |
| JP2009071964A (en) * | 2007-09-12 | 2009-04-02 | Rohm Co Ltd | CHARGE CONTROL CIRCUIT AND ELECTRONIC DEVICE USING THE SAME |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2798715A4 (en) * | 2011-12-29 | 2015-05-13 | Shenzhen Byd Auto R & D Co Ltd | BATTERY PROTECTION CHIP, AND BATTERY PROTECTION CHIP BALANCER CONTROL DEVICE |
| CN105091724A (en) * | 2015-03-05 | 2015-11-25 | 浙江吉利罗佑发动机有限公司 | LVDT measuring head rapid calibration tool and calibration method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011147203A (en) | 2011-07-28 |
| TW201123680A (en) | 2011-07-01 |
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Application publication date: 20110713 |