CN201234123Y - Battery protection circuit and battery pack module - Google Patents
Battery protection circuit and battery pack module Download PDFInfo
- Publication number
- CN201234123Y CN201234123Y CNU2008200955741U CN200820095574U CN201234123Y CN 201234123 Y CN201234123 Y CN 201234123Y CN U2008200955741 U CNU2008200955741 U CN U2008200955741U CN 200820095574 U CN200820095574 U CN 200820095574U CN 201234123 Y CN201234123 Y CN 201234123Y
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- Prior art keywords
- battery
- switching element
- protection unit
- voltage
- battery protection
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- 230000004224 protection Effects 0.000 title claims abstract description 100
- 230000001681 protective effect Effects 0.000 claims description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 239000004065 semiconductor Substances 0.000 description 43
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a battery protection circuit for a secondary battery pack with a plurality of batteries in series connection. The battery protection circuit comprises a charge switch unit and at least one battery protection unit, wherein the charge switch unit is arranged on a charge circuit of the battery pack, and the on/off is controlled by the battery protection unit; and the battery protection unit is used for monitoring the voltage of one battery in the battery pack during charge, and controlling on/off of the charge switch unit when the battery protection unit determines that the voltage reaches a preset over-charge protection threshold voltage. The battery protection circuit further includes a discharge switch unit arranged on the discharge circuit and controlled by the battery protection unit, wherein the battery protection unit is used for monitoring the voltage of one battery in the battery pack during discharge, and controlling on/off of the discharge switch unit when the battery protection unit determines that the voltage is reduced to a preset over-discharge protection threshold voltage. The utility model further discloses a battery pack module using the battery protection circuit. The battery protection circuit and the battery pack module have the advantages of simple and reliable design, low development difficulty, and effectively reduced product cost.
Description
Technical field
The utility model relates to the charging/discharging of secondary cell resist technology, especially a kind of battery module that is used for the battery protecting circuit of plural number joint serial secondary battery group and has this battery protecting circuit.
Background technology
At present, the secondary battery of high power capacity, high security such as the application of lithium ion secondary batteries are increasingly extensive, as are used for various hand electric utensils, in the application scenario of voltage of having relatively high expectations and bigger electric current, need the series connection of more piece secondary cell to use mostly.Because secondary cell self need effectively be protected battery pack, if not so the performance of a wherein a certain battery is affected, just the performance of whole Battery pack is had a greatly reduced quality, weight person may cause the serious consequence of battery burning, blast.So the application to the secondary cell of multi-section serial must have the protection system that can monitor each battery status, so just can make security performance maximization, the chemical property maximization of battery pack.
Traditional protective circuit design has two kinds: adopt the Single-chip Controlling scheme 1.; single-chip microcomputer detects the temperature of every batteries voltage and battery pack; and moment monitoring circuit size of current; situations such as in case battery overcharges, mistake is put, excess temperature, overcurrent; single-chip microcomputer just disconnects discharge loop, conducting again after fault recovery.This method advantage is control flexibly, and shortcoming is that the development and Design difficulty is big, the cost height.2. adopt the way of single-chip microcomputer+protection IC, this method is that general defencive function is placed on the IC, and single-chip microcomputer just cooperates functions such as doing some equilibriums and electric weight demonstration.This method advantage is control flexibly, and shortcoming is that the development and Design difficulty is big, the cost height.
Summary of the invention
Main purpose of the present utility model solves the problems of the prior art exactly, provides a kind of development and Design difficulty little, and design is succinct, the battery protecting circuit that cost is low.
Another purpose of the present utility model provides a kind of battery module, and it comprises above-mentioned battery protecting circuit, and it is little to have a development difficulty, and design is succinct, the advantage that cost is low.
For achieving the above object, the utility model is by the following technical solutions:
A kind of battery protecting circuit that is used for plural number joint serial secondary battery group; it is characterized in that; comprise charging switching element and at least one battery protection unit; charging switching element is arranged on the charge circuit of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when charging; when judging that it reaches default over-charge protective cut-in voltage, control described charging switching element and turn-off.
Preferably:
Also comprise discharge switching element; described discharge switching element is arranged on the discharge loop of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when discharge; when judging that it reduces to default mistake when putting the protection cut-in voltage, control described discharge switching element and turn-off.
Described discharge switching element comprises MOSFET (the Metal OxideSemiconductor Field Effect Transistor that controls described discharge loop break-make; be mos field effect transistor); in the described battery protection unit one also gathered the voltage drop of described MOSFET and judged the size of current of described discharge loop according to it; when it reaches preset value, control described MOSFET and turn-off.
Described battery protection unit and described plural number joint secondary cell are provided with one to one.
Described secondary cell is a lithium rechargeable battery.
A kind of battery module of charged pool protection; comprise the plural number joint secondary cell that is connected in series; it is characterized in that; also comprise charging switching element and at least one battery protection unit; charging switching element is arranged on the charge circuit of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack time is monitored in charging in described battery protection unit, when judging that it reaches default over-charge protective cut-in voltage, controls described charging switching element and turn-offs.
Preferably:
Also comprise discharge switching element; described discharge switching element is arranged on the discharge loop of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when discharge; when judging that it reduces to default mistake when putting the protection cut-in voltage, control described discharge switching element and turn-off.
Described discharge switching element comprises the MOSFET that controls described discharge loop break-make; in the described battery protection unit one also gathered the voltage drop of described MOSFET and judged the size of current of described discharge loop according to it; when it reaches preset value, control described MOSFET and turn-off.
Described battery protection unit and described plural number joint secondary cell are provided with one to one.
Described secondary cell is a lithium rechargeable battery.
The utility model beneficial technical effects is:
The charge circuit of battery protecting circuit battery pack of the present utility model is provided with charging switching element; and turn on and off by the battery protection unit controls; preferably battery protection unit and each battery are provided with one to one; be that each batteries adopts a battery protection unit; the voltage of battery protection unit monitoring respective battery when charging; when judging that it reaches default over-charge protective cut-in voltage; the control charging switching element turn-offs; in time stop charging; thereby avoid battery the phenomenon of overcharging to occur, prolong the life-span of battery pack.
Further, the discharge loop of battery pack is provided with discharge switching element, the voltage of battery protection unit monitoring respective battery when discharge, reduce to default mistake when putting the protection cut-in voltage when judging it, the control discharge switching element turn-offs, in time stop discharge, thereby avoid battery the overdischarge phenomenon to occur; Also monitor the pressure drop of the MOSFET in the discharge switching element when discharge the battery protection unit; and according to its judgement size of current; control MOSFET turn-offs when it reaches preset value, realizes overcurrent protection and short-circuit protection to battery, thereby further prolongs the life-span of battery pack.
Because adopting the battery protection unit to monitor and manage a batteries separately charges, discharges; the utility model has been protected each batteries with the scheme more simple and reliable than traditional scheme; its design is more succinct, and development difficulty is littler, has reduced the design and manufacture cost of product.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the utility model battery protecting circuit;
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Embodiment
Please refer to Fig. 1, the present embodiment battery protecting circuit is used for the multi-section series lithium ionic secondary battery, battery protecting circuit comprise charging switching element, discharge switching element and with a plurality of battery protections unit of the corresponding one by one setting of each batteries.The battery protection unit comprises battery protection ic and signal output apparatus; battery protection ic specifically can be selected chip S-8261 for use; its voltage signal acquisition end links to each other with the both positive and negative polarity of respective battery by the battery pack interface; its over-charge protective control signal output ends protects control signal output ends to link to each other with the respective input of signal output apparatus with crossing to put, and the corresponding output end of signal output apparatus links to each other with the input of charging switching element and discharge switching element respectively.During work; battery protection ic sends the over-charge protective control signal and crosses according to the voltage detecting result puts the protection control signal; deliver to charging switching element and discharge switching element through signal output apparatus, control charging switching element and discharge switching element respectively and turn-off, make battery pack stop to discharge and recharge.
Battery protection unit with the 3rd batteries B3 is an example; the voltage signal acquisition pin VDD (5 pin) of battery protection ic U3, VSS (6 pin) connect anodal B3+ and the negative pole of the 3rd batteries B3 respectively; concern the i.e. anodal B2+ of the second batteries B3 of the latter according to serial connection, signal output apparatus comprises the first metal-oxide-semiconductor Q13, the first diode D13, the second metal-oxide-semiconductor Q23 and the second diode D23.Wherein, the grid of the first metal-oxide-semiconductor Q13 meets the control signal output pin DO (1 pin) of battery protection ic U3; its source electrode meets voltage signal acquisition pin VDD; its drain electrode connects the anode of the first diode D13; the negative electrode of the first diode D13 connects the grid of the second metal-oxide-semiconductor Q23; the grid of the second metal-oxide-semiconductor Q23 also meets another control signal output pin CO (3 pin) of battery protection ic U3, and its source electrode meets voltage signal acquisition pin VDD, and its drain electrode connects the anode of the second diode D23.
The negative electrode of the first diode D13 connects the negative electrode of the first diode D12 in next signal output apparatus in addition by resistance R 22, each signal output apparatus mode according to this connects in turn, the negative electrode of the first diode D11 in the terminal signal output apparatus (it is corresponding with first segment battery B1 among Fig. 1) passes through resistance R 24 ground connection GND, and is connected to discharge switching element by resistance R d.The negative electrode of the second diode D23 connects the negative electrode of the second diode D22 in next signal output apparatus by resistance R 28, each signal output apparatus mode according to this connects in turn, the negative electrode of the second diode D21 in the terminal signal output apparatus (it is corresponding with first segment battery B1 among Fig. 1) connects another ground by resistance R 30, and is connected to charging switching element by resistance R c.
Charging switching element comprises the 3rd metal-oxide-semiconductor Qc and the 4th metal-oxide-semiconductor Qch, the grid connecting resistance Rc of the 3rd metal-oxide-semiconductor Qc (referring to CON node among Fig. 1), its source electrode connects the grid of the 4th metal-oxide-semiconductor Qch, and meet battery anode B+ by resistance R c1, its drain electrode meets i.e. the GND of battery pack negative pole altogether with the drain electrode of the 4th metal-oxide-semiconductor Qch, and the source electrode of the 4th metal-oxide-semiconductor Qch meets charging negative pole J.Discharge switching element comprises the 5th metal-oxide-semiconductor Qd and the 6th metal-oxide-semiconductor Qdch, the grid connecting resistance Rd of the 5th metal-oxide-semiconductor Qd (referring to DON node among Fig. 1), its source electrode connects the grid of the 6th metal-oxide-semiconductor Qdch, and by resistance R d1 connect the discharge anodal P+ (being battery anode B+), its drain electrode meets i.e. the GND of battery pack negative pole altogether with the drain electrode of the 6th metal-oxide-semiconductor Qdch, and the source electrode of the 6th metal-oxide-semiconductor Qdch meets discharge negative pole P-.
Each battery protection ic detects the voltage of corresponding lithium battery separately; when battery overcharges, relevant control pin will be controlled major loop charge and discharge control switch pipe the 4th metal-oxide-semiconductor Qch, the 6th metal-oxide-semiconductor Qdch by the control metal-oxide-semiconductor when putting excessively, stops charge or discharge.Be that example is illustrated respectively in conjunction with concrete function still below with the protection of the 3rd batteries B3:
Over-charge protective:
When overcharge conditions took place the 3rd batteries B3, battery protection ic U3 detected battery B3 and reaches the over-charge protective cut-in voltage, and its 3rd pin CO sends low level signal; the second metal-oxide-semiconductor Q23 conducting is high level on the resistance R c, the 3rd metal-oxide-semiconductor Qc conducting; the 4th metal-oxide-semiconductor Qch by, charging stops.After the situation that overcharges was recovered, the 3rd pin CO of battery protection ic U3 sent high level, and the second metal-oxide-semiconductor Q23 ends, and is low level on the resistance R c, and the 3rd metal-oxide-semiconductor Qc ends, the 4th metal-oxide-semiconductor Qch conducting, and charge circuit is conducting again.
Cross and put protection:
When condition took place to one's heart's content the 3rd batteries B3, battery protection ic U3 detected battery B3 and reached and put the protection cut-in voltage, and its 1st pin DO sends low level; the first metal-oxide-semiconductor Q13 conducting is high level on the resistance R d, the 5th metal-oxide-semiconductor Qd conducting; the 6th metal-oxide-semiconductor Qdch by, discharge stops.After having served as the situation of putting and recovering, the 1st pin DO of battery protection ic U3 sends high level, and the first metal-oxide-semiconductor Q13 ends, and is low level on the resistance R d, and the 5th metal-oxide-semiconductor Qd ends, the 6th metal-oxide-semiconductor Qdch conducting, and discharge loop is conducting again.
As further improvement; the voltage signal acquisition pin VM of the battery protection ic U1 of first segment battery B1 links to each other by the source electrode of resistance with the 6th metal-oxide-semiconductor Qdch; like this; battery protection ic U1 also monitors the voltage drop of the 6th metal-oxide-semiconductor Qdch and judges the size of current of discharge loop according to it; when it reaches predetermined voltage and falls threshold value; control the 6th metal-oxide-semiconductor Qdch and turn-off, realize overcurrent protection and short-circuit protection battery pack.
Overcurrent protection:
When the battery power discharge loop had big electric current to flow through, the conducting internal resistance of the 6th metal-oxide-semiconductor Qdch self produced pressure drop, and electric current is big more; pressure drop is high more, so the 2 pin VM of battery protection ic U1 detect the pressure drop on the 6th metal-oxide-semiconductor Qdch; when it surpasses certain value; battery protection ic U1 just judges the generation overcurrent, and this moment, the 1st pin DO of battery protection ic U1 sent low level, metal-oxide-semiconductor Q11 conducting; resistance R d goes up and is high level; the 5th metal-oxide-semiconductor Qd conducting, the 6th metal-oxide-semiconductor Qdch by, discharge stops.After the overcurrent situation was recovered, the 1st pin DO of battery protection ic U1 sent high level, and metal-oxide-semiconductor Q13 ends, and is low level on the resistance R d, and the 5th metal-oxide-semiconductor Qd ends, the 6th metal-oxide-semiconductor Qdch conducting, and discharge loop is conducting again.
Short-circuit protection is the same with the principle of overcurrent protection, but the current value that detects during short-circuit protection is bigger, so predetermined voltage threshold is also bigger.
As a kind of model for popularization of the present utility model; can also with more than one the series connection secondary cell as a battery unit in the above-mentioned battery pack; the battery protection unit is provided with corresponding to each battery unit; and the over-charge protective cut-in voltage, cross and to put protection cut-in voltage and overcurrent protection threshold voltage all at each battery unit setting, overcharge, cross put and the operation principle of overcurrent protection as previously mentioned.
The utility model has also proposed a kind of battery module on the other hand; wherein adopt battery protecting circuit of the present utility model that the more piece secondary cell that is connected in series is carried out charge and discharge protecting; in the preferred embodiment; this battery protecting circuit is provided with according to previous embodiment; the operation principle of battery protection repeats no more also with reference to preamble herein.
Adopt the utility model; can overcharge at every joint secondary cell in the battery pack, cross put, overcurrent and short-circuit protection; the life-span of battery pack can be prolonged effectively; with respect to prior art; battery protecting circuit of the present utility model and battery module simple and reliable for structure; it is low to design and develop difficulty, thereby has also reduced product cost effectively.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For example, preferably battery protection unit and each batteries are provided with one to one among the embodiment, but only do not get rid of part battery arrangement battery protection of the present utility model unit are not carried out charge and discharge protecting, and all the other batteries are adopted the scheme of other balanced way.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. one kind is used for the battery protecting circuit that plural number saves the serial secondary battery group; it is characterized in that; comprise charging switching element and at least one battery protection unit; charging switching element is arranged on the charge circuit of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when charging; when judging that it reaches default over-charge protective cut-in voltage, control described charging switching element and turn-off.
2. battery protecting circuit as claimed in claim 1; it is characterized in that; also comprise discharge switching element; described discharge switching element is arranged on the discharge loop of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when discharge; when judging that it reduces to default mistake when putting the protection cut-in voltage, control described discharge switching element and turn-off.
3. battery protecting circuit as claimed in claim 2; it is characterized in that; described discharge switching element comprises the MOSFET that controls described discharge loop break-make; in the described battery protection unit one also gathered the voltage drop of described MOSFET and judged the size of current of described discharge loop according to it; when it reaches preset value, control described MOSFET and turn-off.
4. as any described battery protecting circuit of claim 1 to 3, it is characterized in that described battery protection unit and described plural number joint secondary cell are provided with one to one.
5. battery protecting circuit as claimed in claim 4 is characterized in that, described secondary cell is a lithium rechargeable battery.
6. the battery module of charged pool protection; comprise the plural number joint secondary cell that is connected in series; it is characterized in that; also comprise charging switching element and at least one battery protection unit; charging switching element is arranged on the charge circuit of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when charging; when judging that it reaches default over-charge protective cut-in voltage, control described charging switching element and turn-off.
7. battery module as claimed in claim 6; it is characterized in that; also comprise discharge switching element; described discharge switching element is arranged on the discharge loop of battery pack and by described battery protection unit controls and turns on and off; the voltage of the batteries in the described battery pack is monitored in described battery protection unit when discharge; when judging that it reduces to default mistake when putting the protection cut-in voltage, control described discharge switching element and turn-off.
8. battery module as claimed in claim 7; it is characterized in that; described discharge switching element comprises the MOSFET that controls described discharge loop break-make; in the described battery protection unit one also gathered the voltage drop of described MOSFET and judged the size of current of described discharge loop according to it; when it reaches preset value, control described MOSFET and turn-off.
9. as any described battery module of claim 6 to 8, it is characterized in that described battery protection unit and described plural number joint secondary cell are provided with one to one.
10. battery module as claimed in claim 9 is characterized in that, described secondary cell is a lithium rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200955741U CN201234123Y (en) | 2008-07-16 | 2008-07-16 | Battery protection circuit and battery pack module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200955741U CN201234123Y (en) | 2008-07-16 | 2008-07-16 | Battery protection circuit and battery pack module |
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| Publication Number | Publication Date |
|---|---|
| CN201234123Y true CN201234123Y (en) | 2009-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200955741U Expired - Fee Related CN201234123Y (en) | 2008-07-16 | 2008-07-16 | Battery protection circuit and battery pack module |
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| Country | Link |
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| CN (1) | CN201234123Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830269A (en) * | 2010-03-30 | 2010-09-15 | 吕成学 | Built-in lithium battery and protection board of built-in electric motor of electric bicycle |
| CN102867984A (en) * | 2011-07-08 | 2013-01-09 | 北京宝盒精英科技有限公司 | Lithium ion battery system, lithium ion battery direct current output control method and device |
| CN103683210A (en) * | 2012-09-18 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Charge/discharge protection circuit and explosion-proof lamp using same |
| CN103840537A (en) * | 2014-04-02 | 2014-06-04 | 芜湖三木电子科技有限公司 | Battery pack with weak current switch circuit |
| CN104104117A (en) * | 2013-04-01 | 2014-10-15 | 毛广甫 | Storage battery charge and discharge equalization control method and system |
-
2008
- 2008-07-16 CN CNU2008200955741U patent/CN201234123Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830269A (en) * | 2010-03-30 | 2010-09-15 | 吕成学 | Built-in lithium battery and protection board of built-in electric motor of electric bicycle |
| CN102867984A (en) * | 2011-07-08 | 2013-01-09 | 北京宝盒精英科技有限公司 | Lithium ion battery system, lithium ion battery direct current output control method and device |
| CN102867984B (en) * | 2011-07-08 | 2017-02-15 | 北京宝盒精英科技有限公司 | Lithium ion battery system, lithium ion battery direct current output control method and device |
| CN103683210A (en) * | 2012-09-18 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Charge/discharge protection circuit and explosion-proof lamp using same |
| CN104104117A (en) * | 2013-04-01 | 2014-10-15 | 毛广甫 | Storage battery charge and discharge equalization control method and system |
| CN103840537A (en) * | 2014-04-02 | 2014-06-04 | 芜湖三木电子科技有限公司 | Battery pack with weak current switch circuit |
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| 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: 20090506 Termination date: 20170716 |
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| CF01 | Termination of patent right due to non-payment of annual fee |