CN100550563C - Lithium cell protecting device - Google Patents
Lithium cell protecting device Download PDFInfo
- Publication number
- CN100550563C CN100550563C CNB2006101275596A CN200610127559A CN100550563C CN 100550563 C CN100550563 C CN 100550563C CN B2006101275596 A CNB2006101275596 A CN B2006101275596A CN 200610127559 A CN200610127559 A CN 200610127559A CN 100550563 C CN100550563 C CN 100550563C
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- China
- Prior art keywords
- circuit
- rechargeable batteries
- lithium rechargeable
- optically coupled
- abnormal detection
- 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.)
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 69
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000002159 abnormal effect Effects 0.000 claims abstract description 24
- 230000001681 protective effect Effects 0.000 claims description 17
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000003446 memory effect Effects 0.000 description 2
- 229910003307 Ni-Cd Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
A kind of lithium cell protecting device carries out charge or discharge in order to the control external circuits to rechargeable battery, to prevent that this rechargeable battery from overcharging or to put excessively that this lithium cell protecting device comprises: abnormal detection circuit, optically coupled circuit, balancing circuitry and identification circuit.Described battery abnormal detection circuit is checked the voltage of rechargeable battery, and output detection signal.Then, whether balancing circuitry is differentiated for overcharging signal according to detection signal, then rechargeable battery is discharged if overcharge signal.Simultaneously, optically coupled circuit is adjusted the impedance of optically coupled circuit according to detection signal, in order to disconnect being connected of rechargeable battery and external circuits.Identification circuit provides the position of sending signal battery.
Description
Technical field
The present invention relates to a kind of connection in series-parallel battery pack control circuit, particularly a kind of lithium cell protecting device.
Background technology
Rechargeable battery is divided into NI-G (Ni-Cd) and two kinds of ni-mhs (Ni-MH) usually, nickel-cadmium cell is last generation product, rare on the market now, its major defect is that battery has memory effect, life-span is short, and cadmium is a heavy metal species, cause environmental pollution easily, shortcoming at nickel-cadmium cell has been developed Ni-MH battery, compare with nickel-cadmium cell, the memory effect of Ni-MH battery reduces, capacitance increases, overcharging resisting or over-discharge can, recycle the life-span increase, charging interval shortens, the most important thing is not re-use toxic heavy metal, problem of environmental pollution significantly lowers.Certainly, Ni-MH battery is not perfect in every way yet, its environment-adapting ability is relatively poor, be higher than Celsius 45 the degree or be lower than Celsius 0 the degree environment almost can't use, therefore can't power for electronic equipment in very hot or extremely cold place, in addition, need not if after charging is finished, place a period of time, can obviously lose by discovery electric power, charge once more.
Shortcoming at above-mentioned nickel-based battery has been developed lithium battery again, but lithium battery in when charging, if when charging voltage is too high, battery has the danger that produces blast; Otherwise, when lithium battery in when discharge, if when discharge voltage is lower than a fundamental voltage, will have influence on the useful life of lithium battery.Therefore, lithium battery in use (during charge or discharge) can add protective device as shown in Figure 1.
Fig. 1 is that example describes with four lithium batteries of contacting.Wherein protective device 100 comprises four crosstalk pond privacy protection IC 101 and contactors 103.When actual design, can according to lithium battery 102 serial number purposes what, select suitable protection IC 101.IC 101 is when charge or discharge in protection, can detect the voltage of every series lithium battery 102.When detecting the electric voltage exception of lithium battery 102, protection IC 101 can be sent to contactor 103 with signal, contactor 103 is disconnected, to cut off the charge or discharge electric current.Therefore lithium battery 102 numbers that ought contact need be made new protective device 100 not simultaneously again.And the protection IC 101 that present manufacturer can provide can only realize 102 series connection of four lithium batteries at most; because lithium battery 102 is many more; the circuit design of its protection IC 101 is complicated more; add between the complexity of its circuit and unresolved battery may produce unbalanced problem, therefore the above lithium battery protection circuit of five strings unusual difficulty on making because of aging decline is uneven.
Summary of the invention
Main purpose of the present invention; be to solve the problem that exists in the above-mentioned conventional art; the present invention designs again to the secondary battery protective device; make it need not to consider the number of lithium battery series connection; every series lithium battery all with identical circuit board parallel connection, this circuit board has interface and is connected to each other, when any a string battery is unusual; can produce the position in signalisation system and this crosstalk pond, perhaps circuit disconnect switch is to cut off the charge or discharge electric current.
When another main purpose of the present invention was that any a string battery is unusual, whether the circuit board in parallel with it can differentiate battery for overcharging, if overcharge then rechargeable battery is discharged, and finely tunes so that each crosstalk pond balance.
When another main purpose of the present invention is that its lithium battery for many strings uses, can increase or reduce the number of lithium battery series connection easily, not need circuit board manufacturing again, only need the outside to do simple wiring and get final product.
For achieving the above object, the invention provides a kind of lithium cell protecting device, a plurality of lithium rechargeable batteries are carried out charge or discharge in order to the control external circuits, to prevent that described lithium rechargeable batteries from overcharging or to put excessively that described lithium rechargeable batteries protective device comprises:
A plurality of abnormal detection circuits, each described abnormal detection circuit is checked the voltage of corresponding described lithium rechargeable batteries, and output detection signal;
A plurality of optically coupled circuits, each described optically coupled circuit is electrically coupled to corresponding described abnormal detection circuit, and adjusts the impedance of described optically coupled circuit according to described detection signal,
Wherein each described optically coupled circuit comprises:
A light-emitting diode, it is electrically coupled to described corresponding abnormal detection circuit, and is whether luminous in order to the detection signal decision according to described abnormal detection circuit;
A transistor determines described transistorized impedance according to described light-emitting diode whether luminous;
Wherein the transistor series in each described optically coupled circuit together, week is to disconnect being connected of described lithium rechargeable batteries and described external circuits when any one described lithium rechargeable batteries is unusual; And
A plurality of identification circuits, each described identification circuit and corresponding described optically coupled circuit electric coupling, when optically coupled circuit is off-state, corresponding described identification circuit outputs signal to described external circuits, and described external circuits judges that according to described signal the described lithium rechargeable batteries of which position is unusual.
Description of drawings
Fig. 1 is a kind of circuit diagram of traditional lithium cell protecting device;
Fig. 2 is the modular circuit schematic diagram in parallel of a kind of lithium cell protecting device of the present invention;
Fig. 3 is the module in parallel circuit diagram in parallel with battery of a kind of lithium cell protecting device of the present invention;
Fig. 4 is the circuit diagram of a plurality of lithium battery series connection of a kind of lithium cell protecting device of the present invention;
Fig. 5 is the circuit diagram of a plurality of lithium battery series connection of another kind of lithium cell protecting device of the present invention;
Fig. 6 is the circuit diagram that a plurality of lithium batteries of a kind of lithium cell protecting device of the present invention are series at external circuits;
Fig. 7 is another embodiment schematic diagram of a kind of lithium cell protecting device of the present invention;
Fig. 8 is an embodiment schematic diagram again of a kind of lithium cell protecting device of the present invention.
In the accompanying drawing, the list of parts of each label representative is as follows:
4,102: lithium battery
2: abnormal detection circuit
3: optically coupled circuit
31: light-emitting diode
32: transistor
5,103: contactor
6: ON-OFF control circuit
7: external circuits
1,100: protective device
101: protection IC
8: identification circuit
9: balancing circuitry
Embodiment
Relevant technology contents of the present invention and detailed description, existing accompanying drawings is as follows:
Please refer to Fig. 2 and Fig. 3, it is respectively the circuit of the module in parallel of a kind of lithium cell protecting device of the present invention, and the module in parallel circuit diagram in parallel with battery of lithium cell protecting device.In the present invention, protective device 1 comprises abnormal detection circuit 2 and optically coupled circuit 3.
The voltage of 2 pairs of rechargeable batteries 4 of abnormal detection circuit is checked, and is exported detection signal to optically coupled circuit 3.
Optically coupled circuit 3 is adjusted the impedance of optically coupled circuit 3 according to this detection signal, to disconnect being connected or making rechargeable battery 4 discharges or charge of protective device 11 and external circuits.
Wherein, optically coupled circuit 3 comprises light-emitting diode 31 and transistor 32.Whether light-emitting diode 31 is electrically coupled to abnormal detection circuit 2, luminous in order to the voltage decision according to rechargeable battery 4.And transistor 32 is electrically coupled to external circuits, and according to the whether luminous impedance that determines transistor 32 of light-emitting diode 31, to connect or to disconnect external circuits.
In the present embodiment, when battery 4 just often, abnormal detection circuit 2 is sent to the voltage detection signal of rechargeable battery 4 light-emitting diode 31 of optically coupled circuit 3, light-emitting diode 31 begins luminous after receiving detection signal, the transistor 32 of irradiation opposite side, and make the two ends impedance of transistor 32 reduce.
When battery 4 is unusual, abnormal detection circuit 2 can stop to send signals to light-emitting diode 31, and it is luminous to make that light-emitting diode 31 stops, thereby makes the transistor 32 of opposite side not have the irradiation of light, two terminal impedances of transistor 32 become very high thus, are almost the state that opens circuit.
Because the both sides of optically coupled circuit 3 are communicated with the irradiation of using up, do not need and anyly electrically contact, therefore has very high insulating properties between the both sides, utilize this characteristic, we can be as shown in Figure 4, with a plurality of lithium battery 4 series connection that are parallel with this module, the two ends of the transistor 32 of each module also are one another in series, and electric fully isolation the between the two ends of whole string transistor 32 and the whole series lithium battery 4.
In Fig. 4, when any one lithium battery 4 generation is unusual, as mentioned above, this lithium battery 4 abnormal detection circuit 2 in parallel can send and make light-emitting diode 32 stop luminous detection signal, make the transistor 32 of opposite side not have the irradiation of light, thereby make two terminal impedances of transistor 32 become very high, be almost and open circuit.Because for being one another in series, two terminal impedances of therefore whole string transistor 32 become very high, are almost and open circuit between the transistor 32.
Opposite, if all lithium batteries 4 all are in normal condition, two terminal impedances of whole string transistor 32, i.e. the impedance at A, B two ends is very low, and when any one lithium battery 4 generation was unusual, the impedance at A, B two ends became very high, is almost and opens circuit.
Then, utilize the impedance variation of the transistor 32 between A, B end, can design the circuit of a plurality of lithium batteries 4 series connection of another kind of lithium cell protecting device 1 as shown in Figure 5.
In the present embodiment, further design circuit switch 5 and ON-OFF control circuit 6 in protective device, wherein, ON-OFF control circuit 6 is electrically coupled to afterbody optically coupled circuit 3, with the impedance output control signal according to optically coupled circuit 3.And contactor 5 is electrically coupled to ON-OFF control circuit 6, and whether decision cuts off charging current or discharging current according to control signal.
Therefore, when the impedance at A, B two ends was very low, contactor 5 was with conducting; Otherwise, then cut off contactor 5, to cut off the charge or discharge electric current.
Fig. 6 is the circuit diagram that a plurality of lithium batteries of a kind of lithium cell protecting device of the present invention are series at external circuits.Wherein, A, B two ends are electrically coupled to external circuits 7.Wherein, external circuits 7 can for example be system or charger, but not as limit.
In Fig. 6, abnormal detection circuit 2 utilizes the variation of A, B two terminal impedances to notify external circuits 7.Therefore, record the impedance at A, B two ends when very low, external circuits 7 operate as normal when external circuits 7.But when external circuits 7 records the impedance at A, B two ends when very high, external circuits 7 will quit work, to cut off the charge or discharge electric current.
Fig. 7 is another embodiment schematic diagram of a kind of lithium cell protecting device of the present invention.Present embodiment is to be electrically connected identification circuit 8 on the optically coupled circuit 3 of protective device 1, and identification circuit 8 comprises resistance R
X, when optically coupled circuit 3 according to detection signal adjust the impedance of optically coupled circuit, when disconnecting being connected of rechargeable battery 4 and external circuits, identification circuit 8 is informed external circuits with output signal (, resistance value), makes external circuits learn that battery 4 has anomaly.For example, be example with Fig. 4, suppose that the optically coupled circuit 3 of each protective device 1 all is electrically connected an identification circuit 8, and the resistance R of each identification circuit 8
XAll have different resistance values, as 5K, 10K, 15K, 20K etc., when the optically coupled circuit 3 of second protective device 1 was off state, this external circuits can receive the resistance value of 10K, can learn it is second battery generation anomaly thus.
Fig. 8 is the schematic diagram of the another embodiment of a kind of lithium cell protecting device of the present invention.In the present embodiment; except on the optically coupled circuit 3 of protective device 1, being electrically connected the identification circuit 8; abnormal detection circuit 2 also is electrically connected with balancing circuitry 9; when battery 4 overcharges; abnormal detection circuit 2 will be to balancing circuitry 9 output detection signals; make balancing circuitry 9 can control battery 4 and carry out discharging action, damage because of overcharging to avoid battery.
Though below invention has been described in conjunction with the preferred embodiments; but it is not in order to limit the present invention; under the situation that does not break away from the spirit and scope of the present invention; those skilled in the art can revise and adjust, and protection scope of the present invention only is as the criterion with claims institute restricted portion.
Claims (3)
1. a lithium rechargeable batteries protective device carries out charge or discharge in order to the control external circuits to a plurality of lithium rechargeable batteries, to prevent that described lithium rechargeable batteries from overcharging or to put excessively that described lithium rechargeable batteries protective device comprises:
A plurality of abnormal detection circuits, each described abnormal detection circuit is checked the voltage of corresponding described lithium rechargeable batteries, and output detection signal;
A plurality of optically coupled circuits, each described optically coupled circuit is electrically coupled to corresponding described abnormal detection circuit, and adjusts the impedance of described optically coupled circuit according to described detection signal,
Wherein each described optically coupled circuit comprises:
A light-emitting diode, it is electrically coupled to described corresponding abnormal detection circuit, and is whether luminous in order to the detection signal decision according to described abnormal detection circuit;
A transistor determines described transistorized impedance according to described light-emitting diode whether luminous;
Wherein the transistor series in each described optically coupled circuit together, in order to when any one described lithium rechargeable batteries is unusual, to disconnect being connected of described lithium rechargeable batteries and described external circuits; And
A plurality of identification circuits, each described identification circuit and corresponding described optically coupled circuit electric coupling, when optically coupled circuit is off-state, corresponding described identification circuit outputs signal to described external circuits, and described external circuits judges that according to described signal the described lithium rechargeable batteries of which position is unusual.
2. lithium rechargeable batteries protective device as claimed in claim 1, wherein said identification circuit comprises resistance.
3. lithium rechargeable batteries protective device as claimed in claim 1; also comprise a plurality of balancing circuitrys; each described balancing circuitry and corresponding described abnormal detection circuit and corresponding described lithium rechargeable batteries electric coupling; when any one described lithium rechargeable batteries overcharges; described abnormal detection circuit output detection signal is described balancing circuitry extremely, thereby makes described balancing circuitry carry out discharging action to the described lithium rechargeable batteries that overcharges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101275596A CN100550563C (en) | 2005-12-23 | 2006-09-12 | Lithium cell protecting device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520146827.X | 2005-12-23 | ||
| CN200520146827 | 2005-12-23 | ||
| CNB2006101275596A CN100550563C (en) | 2005-12-23 | 2006-09-12 | Lithium cell protecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101026297A CN101026297A (en) | 2007-08-29 |
| CN100550563C true CN100550563C (en) | 2009-10-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101275596A Expired - Fee Related CN100550563C (en) | 2005-12-23 | 2006-09-12 | Lithium cell protecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100550563C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013670A (en) * | 2010-11-10 | 2011-04-13 | 江苏双登集团有限公司 | Split type high-power lithium ion battery pack protection system |
| JP5923253B2 (en) * | 2011-08-01 | 2016-05-24 | 矢崎総業株式会社 | Pressure contact terminal fixing structure |
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2006
- 2006-09-12 CN CNB2006101275596A patent/CN100550563C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101026297A (en) | 2007-08-29 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091014 Termination date: 20140912 |
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| EXPY | Termination of patent right or utility model |