CN201113506Y - Circuit capable of charging low voltage batteries - Google Patents
Circuit capable of charging low voltage batteries Download PDFInfo
- Publication number
- CN201113506Y CN201113506Y CNU2007201716334U CN200720171633U CN201113506Y CN 201113506 Y CN201113506 Y CN 201113506Y CN U2007201716334 U CNU2007201716334 U CN U2007201716334U CN 200720171633 U CN200720171633 U CN 200720171633U CN 201113506 Y CN201113506 Y CN 201113506Y
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- China
- Prior art keywords
- battery pack
- battery
- circuit
- charge
- voltage output
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- 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 - Lifetime
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 14
- 230000005669 field effect Effects 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a circuit capable of charging low-voltage battery packs, which comprises a battery pack management chip for carrying out overcharge/overdischarge protection to a lithium battery pack. The battery pack management chip comprises a charging/discharging control unit connected with the identical polarity ends of the battery pack and a charger, as well as a voltage output port. The circuit also comprises an automatic switch which is connected respectively with the identical polarity ends of the battery pack and a charger and is connected with the voltage output port as well. The automatic switch is turned on when the voltage output port outputs low level, and is cut off when the voltage output port outputs high level. When the voltage of the battery pack is too low, the circuit can carry out charging through the automatic switch, so as to improve the utilization ratio of the battery.
Description
[technical field]
The utility model relates to battery set management chip technology field, and relating in particular to can be to the circuit of low-voltage battery group charging.
[background technology]
The lithium ion battery group of high power capacity, high security has begun to be applied in electrician's instrument, the electric motor car at present, and the lithium battery group that is applied to these fields is composed in series by multisection lithium battery mostly.Management to the multisection lithium battery group generally all is to adopt special-purpose lithium battery group managing chip, and this chip can carry out over-charge protective to the lithium battery group, cross and put protection, overcurrent protection, short-circuit protection, temperature protection, and balanced management.The battery set management chip generally can adopt chips such as S8254, M1414 to realize.
A kind of typical many battery set management chips to the series lithium battery management, generally comprise battery voltage detection unit, current detecting and discharge and recharge unit such as control unit, temperature detection and load detecting unit, some chips also may have the communication unit that communicates with external microcontroller.
Wherein, described temperature detecting unit provides power supply to carry out work by chip, because temperature detection all is to form a potential-divider network with a resistance with NTC or PTC, NTC or PTC are close to the battery pack body and gather the temperature that voltage on PTC or the NTC can detect the battery pack body; Other unit also needs to provide power supply by chip such as communication unit in addition, therefore generally all has a voltage output end mouth on the chip, provide these unit required power supply, the magnitude of voltage of this voltage output end mouth can be 3.3 volts or 5 volts, generally is no more than 5.5 volts.
In charging process; the battery set management chip discharge and recharge the control unit closure; at this moment; battery pack with discharge and recharge control unit and form a loop; connecting charger can charge to battery pack; and this moment, charge and discharge process was subjected to the protection of battery set management chip, can be to the overcharging of lithium battery group, cross put, situations monitoring such as overcurrent, short circuit.But when the battery voltage detection unit detected battery voltage and is lower than certain value, chip will quit work automatically, and at this time discharging and recharging control unit will be ineffective, thereby charging and discharge loop disconnect, and charge circuit forms opens a way.
Because circuit is opened, even at this moment connect charger, can not charge to battery pack, the battery pack that need more renew can cause unnecessary waste like this.
[summary of the invention]
Goal of the invention of the present utility model provide a kind of can be to the circuit of low-voltage battery group charging, this circuit can charge to the A-battery group, improves the utilance of battery.
To achieve the above object of the invention, the utility model proposes following technical scheme:
A kind of circuit that can charge to the A-battery group; comprise and be used for the lithium battery group is carried out over-charge protective, crossed and put the battery set management chip of protection; described battery set management chip comprises the control unit that discharges and recharges of the same polar end that connects described battery pack and charger; and voltage output end mouth;, this circuit also comprises:
Automatic switch, the same polar end that connects described battery pack and described charger respectively, also link to each other with described voltage output end mouth, the conducting when described voltage output end mouth output low level of described automatic switch ends when described voltage output end mouth output high level.
Wherein, described automatic switch comprises the first metal oxide layer semiconductor field-effect transistor MOSFET, and its grid, source electrode link to each other with battery pack one end, described voltage output end mouth respectively, and its drain electrode links to each other with the grid of the 2nd MOSFET; And the 2nd MOSFET, its source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
Wherein, described automatic switch comprises triode, and its base stage, collector electrode link to each other with battery pack one end, described voltage output end mouth respectively, and its emitter links to each other with the grid of the 2nd MOSFET; And the 2nd MOSFET, its source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
Wherein, described automatic switch comprises MOSFET, and its grid links to each other with described voltage output end mouth, and source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
Wherein, also be provided with a diode between described automatic switch and the charger.
Wherein, also be provided with one between described automatic switch and the described diode and reconcile resistance.
Wherein, be provided with biasing resistor between the grid of described MOSFET and the drain electrode.
Preferably, described battery set management chip adopts S8254 chip or M1414 chip to realize.
As can be seen from the above technical solutions, the utility model has increased an automatic switch, crosses when low when battery voltage, can charge by this automatic switch; When the voltage of battery pack progressively is elevated to the operating voltage of battery set management chip; this automatic switch disconnects; charge/discharge unit on the battery set management chip is connected battery pack and charger; can proceed charging, and can obtain the battery set management chip to the overcharging of lithium battery group, cross put, situations such as overcurrent, short circuit protect.Therefore, charging circuit of the present utility model can charge to the battery pack of low-voltage, improve the utilance of battery, and its charging process is safer.
[description of drawings]
Fig. 1 is basic framework figure of the present utility model;
Fig. 2 is the circuit diagram of a kind of embodiment in the utility model.
[embodiment]
Below in conjunction with embodiment the technical solution of the utility model is described in detail.
The battery set management chip that the utility model is mentioned mainly can carry out over-charge protective to the lithium battery group, cross and to put protection, also may be used to realize overcurrent protection, short-circuit protection, temperature protection, and function such as balanced management.The battery set management chip generally can adopt chips such as S8254, M1414 to realize.The realization of the present utility model purpose depends on this characteristic of battery set management chip: during battery set management chip operate as normal, just can export an output voltage, because system for detecting temperature and single-chip microcomputer need this voltage continuous firing, so in case this output voltage is 0, can think that cell voltage is low excessively, the battery set management chip is work not.If the variation of this output voltage is regarded as a kind of conversion of high-low level, can set like this: during high level corresponding battery voltage still on set point, the corresponding battery voltage low excessively (voltage output end mouth no-output voltage) of low level.
With reference to figure 1; the utility model provides a kind of circuit that can charge to the A-battery group; comprise and be used for the lithium battery group is carried out over-charge protective, crossed and put the battery set management chip of protection; described battery set management chip comprises the control unit that discharges and recharges of the same polar end that connects described battery pack and charger; and the voltage output end mouth, this circuit also comprises:
Automatic switch, the same polar end that connects described battery pack and described charger respectively, also link to each other with described voltage output end mouth, the conducting when described voltage output end mouth output low level of described automatic switch ends when described voltage output end mouth output high level.
The course of work of charging circuit of the present utility model is: when battery voltage is crossed when low, automatic switch is with conducting, form the closed-loop path with battery pack, inserting charger can charge to battery pack, charging current flowed to and was this moment: the charging positive terminal is to battery pack, to automatic switch, arrive the charging negative pole end at last; When the voltage of battery pack progressively is elevated to the operating voltage of battery set management chip; the battery set management chip is started working; its voltage output end mouth will be exported high level; this moment, automatic switch disconnected; charge/discharge unit on the battery set management chip is connected battery pack and charger; can proceed charging; and can obtain the battery set management chip to the overcharging of lithium battery group, cross put, situations such as overcurrent, short circuit protect; charging current flowed to and was this moment: the charging positive terminal is to battery pack; to charge/discharge unit, arrive the charging negative pole end at last.
In the utility model, provide the implementation of three kinds of automatic switches.MOSFET is the vitals of automatic switch.MOSFET (Metal-Oxide-Sem onductor Field-Effect Transistor) is the abbreviation of metal oxide layer semiconductor field-effect transistor.MOSFET can be divided into the MOSFET of n-type and p-type according to the polarity difference of its " passage ", is called NMOSFET and PMOSFET usually again, and other are called for short and still comprise NMOS FET, PMOS FET, nMOSFET, pMOSFET etc.
The characteristics of Mosfet are, (G represents grid to voltage Vgs when between grid and source electrode, S represents source electrode) be called critical voltage (threshold voltage less than one, during Vth) value, this MOSFET is in " ending " state (cut-off), electric current can't flow through this MOSFET, just this not conducting of MOSFET; When Vgs conducting during greater than Vth.
Embodiment one
Its circuit diagram please refer to Fig. 2, and described automatic switch comprises the first metal oxide layer semiconductor field-effect transistor MOSFET (Q1), and its grid, source electrode link to each other with battery pack one end, described voltage output end mouth respectively, and its drain electrode links to each other with the grid of the 2nd MOSFET; And the 2nd MOSFET (Q2), its source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.Charge/discharge unit comprises charging control switch S1, discharge control switch S2.
Its course of work is, when battery voltage is lower than the operating voltage of battery set management chip, the chip output low level that quits work, voltage Vgs between Q1 grid (G) and the source electrode (S) is less than Vth, and then Q1 ends, and the Q2 grid is a low level, the Q2 conducting, battery pack and Q2 form the loop, at this moment can charge to battery pack, and the flow direction of charging current arrives the charging negative pole end for charging positive terminal, battery pack, Q2.
When voltage output end mouth output high level, the Q1 conducting, and then the Q2 grid is high level, and Q2 is ended, and do not have charging current and flows through.At this moment, the charge/discharge unit on the battery set management chip is connected battery pack and charger, can proceed charging, and charging current flowed to and was this moment: the charging positive terminal to charge/discharge unit, arrives the charging negative pole end to battery pack at last.
Embodiment two
Replace a MOSFT among the embodiment one with triode, also can realize the function of automatic switch, at this moment, described automatic switch comprises triode, its base stage, collector electrode link to each other with battery pack one end, described voltage output end mouth respectively, and its emitter links to each other with the grid of the 2nd MOSFET; And the 2nd MOSFET, its source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
In the present embodiment, triode is realized the function of a MOSFET, and charging circuit is roughly the same among the course of work of whole charging circuit and the charging current flow direction and the embodiment one.
Embodiment three
The grid of Q2 among the embodiment one is directly received voltage output to be disconnected, also can realize the function of automatic switch, at this moment, described automatic switch comprises MOSFET, its grid links to each other with described voltage output end mouth, source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
MOSFET conducting when voltage output end mouth output low level forms the closed-loop path with battery pack, and battery pack is charged, and charging current flowed to and was this moment: the charging positive terminal to Q2, arrives the charging negative pole end to battery pack at last; MOSFET ends when voltage output end mouth output high level, and above-mentioned closed-loop path is disconnected, at this moment, can battery pack be charged by the charge/discharge unit of battery set management chip, charging current flows to: the charging positive terminal to charge/discharge unit, arrives the charging negative pole end to battery pack at last.
As further improvement of the utility model, in one embodiment, also be provided with a diode between described automatic switch and the charger, diode can prevent effectively that the reversal connection electric current of charger from pouring in down a chimney.
As further improvement of the utility model, in one embodiment, also be provided with one between described automatic switch and the described diode and reconcile resistance.Reconcile the resistance of resistance and can reconcile charging current.
As further improvement of the utility model, in one embodiment, be provided with biasing resistor between the grid of described MOSFET and the drain electrode.
In the more excellent embodiment of the utility model, the battery set management chip specifically adopts chips such as S8254, M1414 to realize.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (8)
1, a kind of circuit that can charge to the A-battery group; comprise and be used for the lithium battery group is carried out over-charge protective, crossed and put the battery set management chip of protection; described battery set management chip comprises the control unit that discharges and recharges of the same polar end that connects described battery pack and charger; and voltage output end mouth; it is characterized in that this circuit also comprises:
Automatic switch, the same polar end that connects described battery pack and described charger respectively, also link to each other with described voltage output end mouth, the conducting when described voltage output end mouth output low level of described automatic switch ends when described voltage output end mouth output high level.
2, the circuit that can charge to the A-battery group according to claim 1, it is characterized in that, described automatic switch comprises the first metal oxide layer semiconductor field-effect transistor MOSFET, its grid, source electrode link to each other with battery pack one end, described voltage output end mouth respectively, and its drain electrode links to each other with the grid of the 2nd MOSFET; And the 2nd MOSFET, its source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
3, the circuit that can charge to the A-battery group according to claim 1, it is characterized in that, described automatic switch comprises triode, and its base stage, collector electrode link to each other with battery pack one end, described voltage output end mouth respectively, and its emitter links to each other with the grid of the 2nd MOSFET; And the 2nd MOSFET, its source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
4, the circuit that can charge to the A-battery group according to claim 1, it is characterized in that described automatic switch comprises MOSFET, its grid links to each other with described voltage output end mouth, source electrode links to each other with described battery pack one end, and drain electrode links to each other with the same polar end of described charger.
5, according to claim 1 or 2 or the 3 or 4 described circuit that can charge to the A-battery group, it is characterized in that, also be provided with a diode between described automatic switch and the charger.
6, the circuit that can charge to the A-battery group according to claim 5 is characterized in that, also is provided with one between described automatic switch and the described diode and reconciles resistance.
7, the circuit that can charge to the A-battery group according to claim 6 is characterized in that, is provided with biasing resistor between the grid of described MOSFET and the drain electrode.
8, according to claim 1 or 2 or the 3 or 4 described circuit that can charge to the A-battery group, it is characterized in that described battery set management chip adopts S8254 chip or M1414 chip to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201716334U CN201113506Y (en) | 2007-09-10 | 2007-09-10 | Circuit capable of charging low voltage batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201716334U CN201113506Y (en) | 2007-09-10 | 2007-09-10 | Circuit capable of charging low voltage batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113506Y true CN201113506Y (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201716334U Expired - Lifetime CN201113506Y (en) | 2007-09-10 | 2007-09-10 | Circuit capable of charging low voltage batteries |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201113506Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710628A (en) * | 2009-10-20 | 2010-05-19 | 海洋王照明科技股份有限公司 | Battery low-voltage protection circuit and battery management circuit |
| CN102355036A (en) * | 2011-09-28 | 2012-02-15 | 重庆长安汽车股份有限公司 | Charging monitoring and managing device for electric automobile |
| WO2018072477A1 (en) * | 2016-10-21 | 2018-04-26 | 蔚来汽车有限公司 | Electric vehicle power battery precharging system and device |
-
2007
- 2007-09-10 CN CNU2007201716334U patent/CN201113506Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710628A (en) * | 2009-10-20 | 2010-05-19 | 海洋王照明科技股份有限公司 | Battery low-voltage protection circuit and battery management circuit |
| CN101710628B (en) * | 2009-10-20 | 2013-03-27 | 海洋王照明科技股份有限公司 | Battery low-voltage protection circuit and battery management circuit |
| CN102355036A (en) * | 2011-09-28 | 2012-02-15 | 重庆长安汽车股份有限公司 | Charging monitoring and managing device for electric automobile |
| WO2018072477A1 (en) * | 2016-10-21 | 2018-04-26 | 蔚来汽车有限公司 | Electric vehicle power battery precharging system and device |
| US10547203B2 (en) | 2016-10-21 | 2020-01-28 | Nio Nextev Limited | Power battery pre-charge system and device for electric vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080910 |