CN103701162A - Battery management system - Google Patents
Battery management system Download PDFInfo
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- CN103701162A CN103701162A CN201310650340.4A CN201310650340A CN103701162A CN 103701162 A CN103701162 A CN 103701162A CN 201310650340 A CN201310650340 A CN 201310650340A CN 103701162 A CN103701162 A CN 103701162A
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Abstract
The invention provides a battery management system which comprises a battery pack, as well as a battery manager and an equalizing charge controller which are connected with the battery pack. The battery management system is further provided with a first switch connected in series with the battery pack, and a second switch connected with the equalizing charge controller. The battery manager is provided with a first signal output port and a second signal output port, and is connected with and controls working states of the first switch and the second switch respectively through the first signal output port and the second signal output port. Compared with the prior art, since the system is additionally provided with the first switch connected in series with the battery pack and the second switch connected with the equalizing charge controller, and the battery manager is connected with and controls the first switch and the second switch, the system can effectively protect the battery pack during overcharge or overdischarge, the service life of the battery pack can be effectively prolonged, and the battery management system has a wider application scope.
Description
Technical field
The present invention relates to battery technology, relate in particular to a kind of battery management system, it has independent protective function and equalizing charge function.
Background technology
Various chemical cells (lead acid accumulator, Ni-MH battery, lithium battery etc.), physical battery (capacitor batteries, radiation battery etc.), the cell life-span is relatively long, after once series connection is used in groups, life-span will shorten greatly because its consistency is poor, shortening amount is usually proportional with the number of connecting, connect more in groups, the life-span is just shorter.Therefore, series battery usually will be equipped with battery management system.Series-connected cell is the requisite energy storage devices such as electric automobile, energy-accumulating power station and ups power, and battery management system is the key component that determines battery pack life-span and use cost.
In prior art, as shown in Figure 1, it comprises battery pack, is parallel to battery manager and the equalizing charge controller at battery strings two ends the schematic diagram of common battery management system, and described battery pack is composed in series by E1 to En, and both are connected to respectively a charger.Concrete operation principle is as follows:
During charging, first by power supply after the accurate constant voltage rectification of constant-current constant-voltage charging device, its charging voltage " V+ " is directly added to battery pack " En+ " and " E1-" two ends, battery pack is accepted the voltage and current value of charger output completely, and described battery manager is mainly done the parameter detecting such as assembled battery total voltage, monomer battery voltage, battery pack temperature.When arbitrary monomer battery voltage or assembled battery total voltage surpass setting voltage, described battery manager will be exported TX1 command signal (being charging signals) in charger, charge closing output after charger decoding, after charge closing device charging current, the part cell bypass discharge switch Kh that surpasses monomer voltage restriction starts closure, corresponding superpressure cell En is by balanced discharge resistance R n, the Kh decompression of discharging.
During system discharge, battery voltage " En+ " and " E1-" are directly added on discharge controller, simultaneously, battery manager will detect information and control signal, by TX2, be transported in discharge controller, when the voltage drop of assembled battery total voltage or arbitrary cell is when setting final voltage, described discharge controller quits work, and battery pack stops exporting electric energy.
Yet above-mentioned battery management system still exists some defects, for example, its battery manager mainly carries out parameter detecting and the parameter conveying functions such as voltage, does not independently close and wide pressure equalizing charge function.Specifically: when charging, once there is transmission fault, will stop charging, sometimes because of charger decoding itself and closing function inefficacy, cannot automatically end the charging to battery pack, the accident of also can overcharging, because charger current is far longer than battery management system euqalizing current, when arbitrary cell arrives equalizing voltage, will send out code to charger, charger complete charge, when superpressure monomer battery voltage drops to the balanced blockade of releasing voltage, battery management system can send charging instruction to charger again, thereby usually cause charger switching on and shutting down frequently, easily cause charger to damage.And when electric discharge, once the communication fault or the under-voltage shut-off circuit of discharge controller that occur between battery management system and discharge controller break down, will cause battery power discharge out of control, thereby cause overdischarge, cause batteries to damage.
Conventionally battery over-discharge or overcharge and all can cause scrapping in advance of battery.Therefore, existing battery management system is difficult to battery effectively to be protected, and necessaryly provides a kind of new battery management system to solve above-mentioned technical problem.
Summary of the invention
Technical problem solved by the invention is to provide a kind of battery management system, and it can effectively protect battery pack, prevents from being damaged in charging and discharging process.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of battery management system, comprise a battery pack and the battery manager being connected with battery pack and equalizing charge controller, described battery pack comprises the cell that some dependent Series connect, the positive and negative end of described each cell is connected to described battery manager, the second switch that described battery management system is also provided with first switch being connected in series with described battery pack and is connected described equalizing charge controller; Described battery manager is provided with first signal delivery outlet and secondary signal delivery outlet, and by described first, second signal output, is connected respectively and controlled the operating state of described the first switch and second switch.
As the further improvement of the technical program, the discharge switch that the positive and negative end of described each cell is also parallel with a bypass discharge resistance and connects with this bypass discharge resistance.
As the further improvement of the technical program, in described battery manager, be provided with a temperature parameter for each cell of Real-Time Monitoring and the chip of voltage parameter.
As the further improvement of the technical program, described second switch is a wide pressure equalizing charge pressure regulation light adjuster part.
As the further improvement of the technical program, described the first switch and second switch are transistor or field effect transistor.
Compared with prior art; battery management system of the present invention is by setting up and the first switch of battery pack series connection and the second switch that is connected equalizing charge controller; and connect and control described the first switch and second switch via battery manager; make its can overcharge or overdischarge process in effective protection battery pack; can effectively increase the useful life of battery pack, and battery management system of the present invention has range of application more widely.
Accompanying drawing explanation
Fig. 1 is the connection diagram of battery management system in prior art.
Fig. 2 is the schematic diagram of battery management system of the present invention.
Embodiment
Refer to shown in Fig. 2, the invention provides a kind of battery management system, its two ends are connecting charger and discharge controller respectively, described charger is connected with a power supply, electric energy output for power supply, described discharge controller is connected with electrical appliance, for by the delivery of electrical energy in battery management system to electrical appliance.
Battery manager and equalizing charge controller, first K switch of connecting with described battery pack and the second switch KQ that is connected described equalizing charge controller that described battery management system comprises a battery pack, is connected with battery pack.Described battery pack comprises some cell E1 ~ En that are connected in series, the positive and negative end of described each cell is connected to respectively described battery manager, carrys out the parameter (as temperature parameter, voltage parameter etc.) of each cell of Real-Time Monitoring by the chip in described battery manager.Simultaneously, the two ends of described each cell are also parallel with a bypass discharge resistance R(R1, R2 ... R n) and the discharge switch Kh (Kh1, the Kh2 that connect with this bypass discharge resistance ... Khn), wherein, described equalizing charge controller connects respectively the described discharge switch Kh of control.Described battery manager is provided with first signal delivery outlet KC and secondary signal delivery outlet KH, described KC and KH are chip pin, wherein, described first signal delivery outlet KC connects described the first K switch of control, described secondary signal delivery outlet KH connects the described second switch KQ of control, thus, can control via the signal sending of described battery manager the operating state of described the first switch and second switch, thereby change the state of equalizing charge controller.
It is worth mentioning that, the first K switch described in the present invention and second switch KQ are sensu lato switch element, and it can be transistor, field effect transistor and other have electronic device or the module of on-off action.The setting of connecting with described battery pack of described the first K switch; formed the independent switch that can control battery set charge/discharge passage; make battery pack discharge and recharge the unlatching of passage or close without relying on outside switching device to realize; thereby effectively protect battery pack; Comparatively speaking, in prior art, need to rely on K switch C(in outside charger ginseng Fig. 1) control the passage that discharges and recharges of battery pack.Described second switch KQ is a wide pressure equalizing charge pressure regulation light adjuster part, it still can carry out little current continuity equalizing charge function after main charging finishes, and can select the withstand voltage parameter of second switch KQ, the present invention can be connected to compared with in the various charging environment of high output voltage.
The operation principle of following article battery management system of the present invention:
As shown in Figure 2, first, the rectification of power supply rectification unit D in charger, after pressure limiting and current limliting, by VC+, VC-connects the main circuit two ends V+ that outputs to battery management system, V-, now by first signal delivery outlet KC output high level, the first K switch is switched on, electric current is exported V+ through battery pack En...E2 by charger, E1, the first K switch is got back to the V-end of charger, the present invention has set up the first K switch, two of second switch KQ discharge and recharge control switch device, wherein the first K switch is carried out quick charge and electric discharge and overcurrent protection switch, it can be controlled battery pack separately.During charging, when the voltage that the arbitrary cell of battery pack detected when battery manager reaches set point, by first signal delivery outlet KC output low level, the first K switch is disconnected, quick charge finishes, this battery management system will enter the equalizing charge stage, now, by secondary signal delivery outlet KH output high level, second switch KQ is switched on, and charging current flows through second switch KQ, and electric current is limited in below euqalizing current, the cell that now reaches setting equalizing voltage starts to carry out bypass electric discharge, and bypass discharging current equals total equalizing charge electric current.When all cells all reach equalizing charge setting voltage, system disconnects second switch KQ, and charging and equalizing charge finish.
When charging, native system is accepted charger maximum output current, make it be operated in the constant current of charger standard or limited current state, fill soon after end, charger is operated in pressure limiting or pressure constant state, it is more that charger output voltage can exceed assembled battery total voltage, now by second switch KQ, bears the difference between charger voltage V+ and battery voltage.Like this, just allow charger voltage to exceed battery voltage, the precision of charger and voltage range are required greatly to reduce.And, being different from prior art, this battery management system can directly replace lead acid accumulator and use in lead-acid storage battery system.
Outwards during electric discharge, the battery pack being formed by E1, E2...En cell, its electric current by En+ through common discharge controller VK+, VK-(or directly through electrical appliance VF+, VF-), K, get back to the E1-utmost point.During electric discharge, battery manager will be monitored the voltage of each cell in battery pack at any time, when arbitrary monomer battery voltage drops to set point, described first signal delivery outlet KC will send cut-off signal, disconnect described the first K switch, thereby cut off the discharge channel of battery pack, battery pack stops electric discharge.During electric discharge, if when battery manager detects discharging current overrate, described first signal delivery outlet KC also will send shutdown signal, disconnect the first K switch, protect this battery pack not to be damaged.
In sum; battery management system of the present invention can directly replace lead acid accumulator, uses in lead-acid storage battery system, and range of application is wider; and; it,, by the first K switch and second switch KQ are set, makes to have independent protective function, can effectively protect battery pack; it is obviously different from prior art only take and detects the battery management system as main; and there is wide pressure equalizing charge design, and can when charging, synchronously carry out equalizing charge, do not need charge closing device.
The above; it is only most preferred embodiment of the present invention; not the present invention is done to any pro forma restriction; any those of ordinary skill in the art; do not departing from technical solution of the present invention scope situation; utilize the method content of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, all belong to the scope of claims protection.
Claims (5)
1. a battery management system, comprise a battery pack and the battery manager being connected with battery pack and equalizing charge controller, described battery pack comprises the cell that some dependent Series connect, the positive and negative end of described each cell is connected to described battery manager, it is characterized in that: the second switch that described battery management system is also provided with first switch being connected in series with described battery pack and is connected described equalizing charge controller; Described battery manager is provided with first signal delivery outlet and secondary signal delivery outlet, and by described first, second signal output, is connected respectively and controlled the operating state of described the first switch and second switch.
2. battery management system according to claim 1, is characterized in that: the discharge switch that the positive and negative end of described each cell is also parallel with a bypass discharge resistance and connects with this bypass discharge resistance.
3. battery management system according to claim 2, is characterized in that: in described battery manager, be provided with a temperature parameter for each cell of Real-Time Monitoring and the chip of voltage parameter.
4. battery management system according to claim 3, is characterized in that: described second switch is a wide pressure equalizing charge pressure regulation light adjuster part.
5. battery management system according to claim 3, is characterized in that: described the first switch and second switch are transistor or field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310650340.4A CN103701162A (en) | 2013-12-06 | 2013-12-06 | Battery management system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310650340.4A CN103701162A (en) | 2013-12-06 | 2013-12-06 | Battery management system |
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| CN103701162A true CN103701162A (en) | 2014-04-02 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578260A (en) * | 2014-12-22 | 2015-04-29 | 山东神工海特电子科技有限公司 | Control device for electric vehicle |
| CN105743188A (en) * | 2016-05-13 | 2016-07-06 | 信阳师范学院 | Plumbic acid battery pack protection system |
| WO2016119169A1 (en) * | 2015-01-29 | 2016-08-04 | 王正权 | Structure of electricity storage apparatus |
| CN107284285A (en) * | 2017-07-28 | 2017-10-24 | 东莞恒量新能源科技有限公司 | Electric control system of electric vehicle and its charge/discharge control method with interconnected communication |
| CN108539824A (en) * | 2018-05-09 | 2018-09-14 | 江苏上德电子科技有限公司 | The protection control method of lithium-ions battery module |
| CN109149678A (en) * | 2017-06-28 | 2019-01-04 | 比亚迪股份有限公司 | Balanced charging method and its device for battery pack |
| CN109274159A (en) * | 2018-11-23 | 2019-01-25 | 苏州蓝石新动力有限公司 | A kind of charging system |
| CN110011366A (en) * | 2018-01-05 | 2019-07-12 | 硕天科技股份有限公司 | Uninterrupted power system and its cell managing device |
| CN113629822A (en) * | 2021-09-02 | 2021-11-09 | 阳光电源股份有限公司 | Energy storage system and control method thereof |
-
2013
- 2013-12-06 CN CN201310650340.4A patent/CN103701162A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578260A (en) * | 2014-12-22 | 2015-04-29 | 山东神工海特电子科技有限公司 | Control device for electric vehicle |
| WO2016119169A1 (en) * | 2015-01-29 | 2016-08-04 | 王正权 | Structure of electricity storage apparatus |
| CN105743188A (en) * | 2016-05-13 | 2016-07-06 | 信阳师范学院 | Plumbic acid battery pack protection system |
| CN109149678A (en) * | 2017-06-28 | 2019-01-04 | 比亚迪股份有限公司 | Balanced charging method and its device for battery pack |
| CN109149678B (en) * | 2017-06-28 | 2021-11-12 | 比亚迪股份有限公司 | Equalizing charge method and device for battery pack |
| CN107284285A (en) * | 2017-07-28 | 2017-10-24 | 东莞恒量新能源科技有限公司 | Electric control system of electric vehicle and its charge/discharge control method with interconnected communication |
| CN110011366A (en) * | 2018-01-05 | 2019-07-12 | 硕天科技股份有限公司 | Uninterrupted power system and its cell managing device |
| CN108539824A (en) * | 2018-05-09 | 2018-09-14 | 江苏上德电子科技有限公司 | The protection control method of lithium-ions battery module |
| CN109274159A (en) * | 2018-11-23 | 2019-01-25 | 苏州蓝石新动力有限公司 | A kind of charging system |
| CN113629822A (en) * | 2021-09-02 | 2021-11-09 | 阳光电源股份有限公司 | Energy storage system and control method thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140402 |