CN201623470U - Protection circuit of power lithium ion batteries - Google Patents
Protection circuit of power lithium ion batteries Download PDFInfo
- Publication number
- CN201623470U CN201623470U CN2010200152266U CN201020015226U CN201623470U CN 201623470 U CN201623470 U CN 201623470U CN 2010200152266 U CN2010200152266 U CN 2010200152266U CN 201020015226 U CN201020015226 U CN 201020015226U CN 201623470 U CN201623470 U CN 201623470U
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- battery
- power lithium
- control switch
- protective circuit
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Abstract
The utility model discloses a protection circuit of power lithium ion batteries, which has the main technical key points that the protection circuit comprises a protection circuit used for implementing over-charging protection and over-discharging protection for a battery pack formed by connecting the plurality of power lithium ion batteries in series, an equalizing circuit used for equalizing single bodies of the battery pack, and a temperature protection circuit used for protecting the battery pack due to the temperature. The protection circuit of the power lithium ion batteries solves the problems that when the plurality of power lithium ion batteries are connected in series for use, over-charging or over-discharging damage is caused by the performance difference among the battery single bodies, the charge retention capability of the battery pack is influenced, the whole performance of the battery pack is reduced, and the battery pack is damaged by the overhigh temperature; furthermore, by adopting an IC microprocessor, the protection circuit greatly reduces the production cost, leads all items of parameters to be set and read, and improves the production efficiency.
Description
Technical field
The utility model relates to a kind of protective circuit of power lithium-ion battery.
Background technology
Li-Ion rechargeable battery is since early 1990s formal practicability, and in less than the time in 20 years, capacity increases fast, and market increases rapidly.Just expanding to fields such as motor vehicle and environmental protection electric power storage now from the portable product purposes.When lithium ion battery uses as electrokinetic cell, when for example using, often need the above lithium ion battery series connection of 5 joints is used, to reach the needed voltage of motor with its driving battery as electric bicycle.When it being charged with charger, because the quality of every batteries can not be just the same, in case there is a batteries to be in overcharge condition, just may cause lithium ion excessively to take off embedding from positive pole, thereby make short circuit between electrodes, not only influence battery capacity, life-span, and cause battery explosion, hazard of catch fire accident to take place easily.Connect when load,,, just may cause lithium ion excessively to take off embedding, thereby make short circuit between electrodes, influence battery capacity, life-span from negative pole in case there is a batteries to be in over-discharge state because the quality of every batteries can not be just the same.Because each monomer of lithium ion battery can not be in full accord on performance index, in use because the difference of capacity, self discharge between each monomer etc., accumulate over a long period, in use for some time, the retention of charge of battery pack obviously reduces, and influenced lithium ion battery applying in a wider context.Therefore, when the multiple batteries series connection was used, the quality of its performance not only depended on the quality of battery cell quality, the prior height that depends on its total quality.When battery pack was in the charge or discharge state, because the global voltage of battery pack is higher, the electric current that flows through cell was bigger, and because the quality of every batteries can not be just the same, caused the integral battery door group to damage because of the single battery temperature is too high easily.
In addition, all be to adopt discrete component or be in series for the protective circuits of the above lithium ion battery group of 5 joints by a plurality of battery protection ic chips.Discrete component constitutes sampling, the comparison of protective circuit by voltage, judges whether to overcharge, overdischarge, and then the discharging and recharging of control battery pack.The circuit theory of this mode is simple, but every batteries all needs a cover to detect decision circuitry, and quiescent dissipation is very big, and along with the battery serial number increases and the power consumption increase, is unfavorable for the charged maintenance of battery.The protective circuit that a plurality of battery protection ic chips of sampling are in series, though the index of power consumption is not high, cost is higher; and poor reliability, because the voltage endurance of its chip, under the situation of some inductive load; very easily damage, the use to the lithium ion battery group has brought potential safety hazard like this.For above-mentioned protective circuit; the disposable setting when producing of the parameters of battery is finished; can not be modified; can only be applicable to the battery pack of specific standard model; therefore the scope of application is too narrow, and manufacturer is when carrying out last quality inspection, needs the workman to use checking tool such as universal instrument that each discrete component is detected one by one; time-consuming, production efficiency is lower.
Summary of the invention
Technical problem to be solved in the utility model is: the protective circuit that a kind of power lithium-ion battery is provided; when connecting use to solve the multi-section lithium ion battery; owing to causing, the performance difference between each battery cell overcharges or overdischarge damages, influence the retention of charge of battery pack, the problem and the too high problem of damaging of battery pack Yin Wendu of reduction battery pack overall performance; and greatly reduce production cost, improved production efficiency.
For solving the problems of the technologies described above, the technical solution of the utility model is: the protective circuit of power lithium-ion battery, comprise by input/output port and be connected in the main circuit that the series battery between the described input/output port is formed, described protective circuit comprises the battery detecting control unit, and the both positive and negative polarity of each single battery in the input port of described battery detecting control unit and the series battery is connected; Operations Analysis, described Operations Analysis and described two-way connection of battery detecting control unit; To the communication unit that battery parameter is set and read, described communication unit is connected with described Operations Analysis is two-way; Be serially connected with overcharge control switch and overdischarge control switch in the described main circuit; Be connected in described first switch driving circuit that overcharges between control switch and the described Operations Analysis, be connected in the second switch drive circuit between described overdischarge control switch and the described Operations Analysis.
As a kind of optimized technical scheme, described input/output port comprises a shared input/output port, a charging input end mouth and a discharge output port, what an electrode of described shared input/output port and described series battery was connected to form described main circuit discharges and recharges the common circuit part, and described charging input end mouth and described discharge output port are connected to form the charging paths and the discharge paths of described main circuit respectively with another electrode of described series battery; The described control switch that overcharges is serially connected with in the described charging paths, and described overdischarge control switch is serially connected with in the described discharge paths.The described control switch that overcharges is one first metal-oxide-semiconductor, and described overdischarge control switch is one second metal-oxide-semiconductor.
As a kind of optimized technical scheme; described protective circuit also comprises an equalizing circuit; described equalizing circuit comprises the self discharge branch road of each the single battery positive and negative end that is arranged at described series battery; described each self discharge branch road comprises a self discharge control switch and an equalizing resistance, and the control end of described self discharge control switch is connected with the Balance Control terminal of described battery detecting control unit.Described self discharge control switch is one the 3rd metal-oxide-semiconductor.
As a kind of optimized technical scheme, described protective circuit also comprises a temperature sensing circuit, and the output of described temperature sensing circuit is connected with described Operations Analysis, and the input of described temperature sensing circuit is connected with thermal resistance.Described temperature sensing circuit comprises internal temperature testing circuit and external temperature testing circuit.
As a kind of optimized technical scheme, described battery detecting control unit, described temperature sensing circuit, described Operations Analysis, described communication unit, described first switch driving circuit and described second switch drive circuit are integrated in the inside of an IC microprocessor.
As a kind of optimized technical scheme, described communication unit comprise with the two-way memory cell that is connected of described Operations Analysis with the two-way communication interface that is connected of described memory cell, described memory cell is made up of EPROM.
After having adopted technique scheme, the beneficial effects of the utility model are:
1. protective circuit of the present utility model; owing to battery detecting control unit, temperature sensing circuit, Operations Analysis, communication unit, first switch driving circuit and second switch drive circuit are integrated in the inside of an IC microprocessor; can control by coding; simplified hardware circuit design; reduced component number; dwindled volume, IC microprocessor can save the battery pack that lithium ion battery forms to 5-13 and protect, and greatly reduces production cost.
2. because protective circuit of the present utility model comprises a communication unit; can set different battery parameters at the lithium ion battery group of different model specification; widened the scope of application of protective circuit greatly; and because parameters can be set, can read; can carry out quality testing fast; greatly facilitate the operation of factory, improved the continuous productive process ability, and then improved production efficiency.
3. this protective circuit can be cut off circuit timely and effectively when arbitrary joint cell occurs overcharging with overdischarge; guaranteed that arbitrary joint cell can be because of not overcharging or overdischarge damages; equalizing circuit has effectively guaranteed the consistency of each monomer battery voltage of battery pack; improved the whole retention of charge of battery pack; when temperature sensing circuit surpasses set point in battery pack temperature or protective circuit temperature inside; can cut off circuit timely and effectively; effectively guaranteed the internal temperature of each monomer of battery pack; solved the too high and problem damaged of cell Yin Wendu, be suitable for the battery pack that the above lithium ion battery of five joints is in series and use.
Description of drawings
Accompanying drawing is circuit theory diagrams of the present utility model.
Embodiment
As shown in drawings, a kind of protective circuit of power lithium-ion battery.It comprises by input/output port and is connected in the main circuit that the series battery between the input/output port is formed that this input/output port comprises a shared input/output port PACK+, a charging input end mouth CHG-and a discharge output port PACK-.What wherein, the positive pole of shared input/output port PACK+ and series battery was connected to form main circuit discharges and recharges the common circuit part; Charging input end mouth CHG-and discharge output port PACK-are connected to form the charging paths and the discharge paths of main circuit respectively with the negative pole of series battery.
This protective circuit also comprises the battery detecting control unit, and the both positive and negative polarity of each single battery in the input port of this battery detecting control unit and the series battery is connected; Operations Analysis, this Operations Analysis is connected with the battery detecting control unit is two-way; The communication unit that battery parameter is set and read, this communication unit is connected with Operations Analysis is two-way, it comprise with the two-way memory cell that is connected of Operations Analysis with the two-way communication interface that is connected of memory cell, memory cell is made up of EPROM; Be serially connected with overcharge control switch and overdischarge control switch in the main circuit, wherein, the control switch that overcharges is serially connected with in the above-mentioned charging paths, and the overdischarge control switch is serially connected with in the above-mentioned discharge paths; Also comprise being connected in first switch driving circuit that overcharges between control switch and the Operations Analysis, be connected in the second switch drive circuit between overdischarge control switch and the Operations Analysis; This protective circuit also comprises an equalizing circuit, it comprises the self discharge branch road of each the single battery positive and negative end that is arranged at series battery, each self discharge branch road comprises a self discharge control switch and an equalizing resistance Rd, and the control end of self discharge control switch is connected with the Balance Control terminal CB of battery detecting control unit; This protective circuit also comprises a temperature sensing circuit, and it is connected with Operations Analysis, comprises internal temperature testing circuit and external temperature testing circuit, and wherein, the input of external temperature testing circuit is connected with thermal resistance.
Above-mentioned battery detecting control unit, temperature sensing circuit, Operations Analysis, communication unit, first switch driving circuit and second switch drive circuit are integrated in the inside of an IC microprocessor.
The above-mentioned control switch that overcharges adopts one first metal-oxide-semiconductor N1, and the overdischarge control switch adopts one second metal-oxide-semiconductor N2, and the self discharge control switch adopts one the 3rd metal-oxide-semiconductor N3.
This protective circuit realizes following defencive function:
1. additives for overcharge protection, the course of work is: at first, according to the specifications and models of the battery pack that adopts, by communication unit battery parameter is set, stored among the EPROM.When the lithium ion battery group is in charged state, first switch driving circuit output high level, the first metal-oxide-semiconductor N1 is in conducting state, the battery detecting control unit of IC microprocessor internal uninterruptedly detects each monomer battery voltage, Operations Analysis compares the data among detected data and the EPROM, when arbitrary joint monomer battery voltage surpasses setting voltage, Operations Analysis sends control signal and gives first switch driving circuit, the output signal of final first switch driving circuit is converted to low level by high level, the first metal-oxide-semiconductor N1 disconnects, stop to batteries charging, guaranteed that arbitrary joint cell can not damage because of overcharging.
2. over, the course of work: at first,, battery parameter is set, stored among the EPROM by communication unit according to the specifications and models of the battery pack that adopts.When the lithium ion battery group is in discharge condition, second switch drive circuit output high level, the second metal-oxide-semiconductor N2 is in conducting state, the battery detecting control unit of IC microprocessor internal uninterruptedly detects each monomer battery voltage, Operations Analysis compares the data among detected data and the EPROM, when arbitrary joint monomer battery voltage is lower than setting voltage, Operations Analysis sends control signal and gives the second switch drive circuit, the output signal of final second switch drive circuit is converted to low level by high level, the second metal-oxide-semiconductor N2 disconnects, stop load discharge, guaranteed that arbitrary joint cell can not damage because of overdischarge.
3. electric weight equilibrium, the course of work: at first,, battery parameter is set, stored among the EPROM by communication unit according to the specifications and models of the battery pack that adopts.When battery pack is in charged state and shelves state, the battery detecting control unit of IC microprocessor internal uninterruptedly detects each cell, and detecting transfer of data to Operations Analysis, Operations Analysis compares the data among data and the EPROM, when each monomer battery voltage difference exceeds the setting voltage difference, Operations Analysis output control signal makes the Balance Control terminal CB output high level of battery detecting control unit, self discharge control switch the 3rd metal-oxide-semiconductor N3 conducting that is attached thereto, cell is by equalizing resistance Rd discharge, in the time of in voltage difference drops to setting range, Balance Control terminal CB becomes low level by high level, the 3rd metal-oxide-semiconductor N3 disconnects, cell stops discharge, voltage and other cell voltage of this cell are consistent, this equalizing circuit has effectively guaranteed the consistency of each monomer battery voltage of battery pack, has improved the whole retention of charge of battery pack.
4. temperature protection, the course of work: at first,, battery parameter is set, stored among the EPROM by communication unit according to the specifications and models of the battery pack that adopts.When battery pack is in the charge or discharge state, the internal temperature testing circuit of IC microprocessor internal and external temperature testing circuit uninterruptedly detect the operating ambient temperature of battery pack, and a detection data is passed to Operations Analysis, Operations Analysis compares the data among data and the EPROM, when the temperature of the ambient temperature of outside or IC microprocessor internal exceeds setting range, the output that Operations Analysis output control signal is controlled first switch driving circuit or second switch drive circuit is converted to low level by high level, the first metal-oxide-semiconductor N1 or the second metal-oxide-semiconductor N2 are become by conducting and end, and battery pack integral body quits work.This temperature protection circuit has effectively guaranteed the internal temperature of each monomer of battery pack, has avoided the too high and problem damaged of cell Yin Wendu.
Claims (9)
1. the protective circuit of power lithium-ion battery comprises by input/output port and is connected in the main circuit that the series battery between the described input/output port is formed that it is characterized in that: described protective circuit comprises
The both positive and negative polarity of each single battery in the battery detecting control unit, the input port of described battery detecting control unit and series battery is connected;
Operations Analysis, described Operations Analysis and described two-way connection of battery detecting control unit;
To the communication unit that battery parameter is set and read, described communication unit is connected with described Operations Analysis is two-way;
Be serially connected with overcharge control switch and overdischarge control switch in the described main circuit;
Be connected in described first switch driving circuit that overcharges between control switch and the described Operations Analysis, be connected in the second switch drive circuit between described overdischarge control switch and the described Operations Analysis.
2. the protective circuit of power lithium-ion battery as claimed in claim 1, it is characterized in that: described input/output port comprises a shared input/output port, a charging input end mouth and a discharge output port, what an electrode of described shared input/output port and described series battery was connected to form described main circuit discharges and recharges the common circuit part, and described charging input end mouth and described discharge output port are connected to form the charging paths and the discharge paths of described main circuit respectively with another electrode of described series battery;
The described control switch that overcharges is serially connected with in the described charging paths, and described overdischarge control switch is serially connected with in the described discharge paths.
3. the protective circuit of power lithium-ion battery as claimed in claim 2, it is characterized in that: the described control switch that overcharges is one first metal-oxide-semiconductor, described overdischarge control switch is one second metal-oxide-semiconductor.
4. the protective circuit of power lithium-ion battery as claimed in claim 3; it is characterized in that: described protective circuit also comprises an equalizing circuit; described equalizing circuit comprises the self discharge branch road of each the single battery positive and negative end that is arranged at described series battery; described each self discharge branch road comprises a self discharge control switch and an equalizing resistance, and the control end of described self discharge control switch is connected with the Balance Control terminal of described battery detecting control unit.
5. the protective circuit of power lithium-ion battery as claimed in claim 4, it is characterized in that: described self discharge control switch is one the 3rd metal-oxide-semiconductor.
6. the protective circuit of power lithium-ion battery as claimed in claim 5; it is characterized in that: described protective circuit also comprises a temperature sensing circuit; the output of described temperature sensing circuit is connected with described Operations Analysis, and the input of described temperature sensing circuit is connected with thermal resistance.
7. the protective circuit of power lithium-ion battery as claimed in claim 6, it is characterized in that: described temperature sensing circuit comprises internal temperature testing circuit and external temperature testing circuit.
8. the protective circuit of power lithium-ion battery as claimed in claim 7, it is characterized in that: described battery detecting control unit, described temperature sensing circuit, described Operations Analysis, described communication unit, described first switch driving circuit and described second switch drive circuit are integrated in the inside of an IC microprocessor.
9. the protective circuit of power lithium-ion battery as claimed in claim 8; it is characterized in that: described communication unit comprise with the two-way memory cell that is connected of described Operations Analysis with the two-way communication interface that is connected of described memory cell, described memory cell is made up of EPROM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200152266U CN201623470U (en) | 2010-01-12 | 2010-01-12 | Protection circuit of power lithium ion batteries |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200152266U CN201623470U (en) | 2010-01-12 | 2010-01-12 | Protection circuit of power lithium ion batteries |
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| CN201623470U true CN201623470U (en) | 2010-11-03 |
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| CN2010200152266U Expired - Fee Related CN201623470U (en) | 2010-01-12 | 2010-01-12 | Protection circuit of power lithium ion batteries |
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Cited By (14)
| 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 |
| CN102723745A (en) * | 2011-03-29 | 2012-10-10 | 比亚迪股份有限公司 | Battery pack management system |
| CN102761148A (en) * | 2011-04-29 | 2012-10-31 | 比亚迪股份有限公司 | Battery pack management system |
| CN102801184A (en) * | 2011-05-24 | 2012-11-28 | 比亚迪股份有限公司 | Battery pack management system |
| CN102957175A (en) * | 2011-08-23 | 2013-03-06 | 福建睿能电子有限公司 | Multi-cell serially-connected lithium battery pack equalization and protection system |
| CN102957172A (en) * | 2011-08-23 | 2013-03-06 | 福建睿能电子有限公司 | Multi-cell serially-connected lithium battery pack equalization and protection system |
| CN103066570A (en) * | 2013-01-18 | 2013-04-24 | 浙江绿源电动车有限公司 | Battery protection device and server and battery management system |
| CN104737411A (en) * | 2012-11-07 | 2015-06-24 | 株式会社丰田自动织机 | Voltage equalization device |
| CN105098729A (en) * | 2015-09-15 | 2015-11-25 | 李军 | Intelligent lithium battery protection device and control method thereof |
| CN107589382A (en) * | 2017-10-25 | 2018-01-16 | 宁夏黑金昊源绿能科技有限公司 | A kind of detection means of battery surplus and health status |
| CN109217260A (en) * | 2018-09-27 | 2019-01-15 | 倍登新能源科技（苏州）有限公司 | Overcurrent protector for power tool battery packet |
| CN109728366A (en) * | 2018-12-28 | 2019-05-07 | 上汽通用五菱汽车股份有限公司 | Anti- battery block dismounting generates method, battery management system and the storage medium of electric arc |
| WO2021032221A3 (en) * | 2019-08-20 | 2021-04-15 | 深圳市道通智能航空技术股份有限公司 | Battery balancing self-discharge circuit and unmanned aerial vehicle |
| CN114660493A (en) * | 2022-05-20 | 2022-06-24 | 苏州恒美电子科技股份有限公司 | Battery cell information acquisition circuit and battery cell internal resistance acquisition method |
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2010
- 2010-01-12 CN CN2010200152266U patent/CN201623470U/en not_active Expired - Fee Related
Cited By (23)
| 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 |
| CN102723745B (en) * | 2011-03-29 | 2015-06-24 | 比亚迪股份有限公司 | Battery pack management system |
| CN102723745A (en) * | 2011-03-29 | 2012-10-10 | 比亚迪股份有限公司 | Battery pack management system |
| CN102761148A (en) * | 2011-04-29 | 2012-10-31 | 比亚迪股份有限公司 | Battery pack management system |
| CN102761148B (en) * | 2011-04-29 | 2015-08-26 | 比亚迪股份有限公司 | A kind of batteries management system |
| CN102801184A (en) * | 2011-05-24 | 2012-11-28 | 比亚迪股份有限公司 | Battery pack management system |
| CN102801184B (en) * | 2011-05-24 | 2015-08-26 | 比亚迪股份有限公司 | A kind of batteries management system |
| CN102957175B (en) * | 2011-08-23 | 2015-07-08 | 福建睿能科技股份有限公司 | Multi-cell serially-connected lithium battery pack equalization and protection system |
| CN102957172B (en) * | 2011-08-23 | 2015-04-22 | 福建睿能科技股份有限公司 | Multi-cell serially-connected lithium battery pack equalization and protection system |
| CN102957172A (en) * | 2011-08-23 | 2013-03-06 | 福建睿能电子有限公司 | Multi-cell serially-connected lithium battery pack equalization and protection system |
| CN102957175A (en) * | 2011-08-23 | 2013-03-06 | 福建睿能电子有限公司 | Multi-cell serially-connected lithium battery pack equalization and protection system |
| CN104737411A (en) * | 2012-11-07 | 2015-06-24 | 株式会社丰田自动织机 | Voltage equalization device |
| CN104737411B (en) * | 2012-11-07 | 2017-04-12 | 株式会社丰田自动织机 | Voltage equalization device |
| CN103066570B (en) * | 2013-01-18 | 2016-06-29 | 浙江绿源电动车有限公司 | Battery protecting apparatus, server and battery management system |
| CN103066570A (en) * | 2013-01-18 | 2013-04-24 | 浙江绿源电动车有限公司 | Battery protection device and server and battery management system |
| CN105098729A (en) * | 2015-09-15 | 2015-11-25 | 李军 | Intelligent lithium battery protection device and control method thereof |
| CN105098729B (en) * | 2015-09-15 | 2017-11-28 | 天津动芯科技有限公司 | A kind of Intelligent lithium battery protection device and its control method |
| CN107589382A (en) * | 2017-10-25 | 2018-01-16 | 宁夏黑金昊源绿能科技有限公司 | A kind of detection means of battery surplus and health status |
| CN109217260A (en) * | 2018-09-27 | 2019-01-15 | 倍登新能源科技（苏州）有限公司 | Overcurrent protector for power tool battery packet |
| CN109728366A (en) * | 2018-12-28 | 2019-05-07 | 上汽通用五菱汽车股份有限公司 | Anti- battery block dismounting generates method, battery management system and the storage medium of electric arc |
| WO2021032221A3 (en) * | 2019-08-20 | 2021-04-15 | 深圳市道通智能航空技术股份有限公司 | Battery balancing self-discharge circuit and unmanned aerial vehicle |
| CN114660493A (en) * | 2022-05-20 | 2022-06-24 | 苏州恒美电子科技股份有限公司 | Battery cell information acquisition circuit and battery cell internal resistance acquisition method |
| CN114660493B (en) * | 2022-05-20 | 2022-08-30 | 苏州恒美电子科技股份有限公司 | Battery cell information acquisition circuit and battery cell internal resistance acquisition method |
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