CN201893589U - Serial battery pack charge balance system - Google Patents
Serial battery pack charge balance system Download PDFInfo
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- CN201893589U CN201893589U CN2010206713917U CN201020671391U CN201893589U CN 201893589 U CN201893589 U CN 201893589U CN 2010206713917 U CN2010206713917 U CN 2010206713917U CN 201020671391 U CN201020671391 U CN 201020671391U CN 201893589 U CN201893589 U CN 201893589U
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Abstract
The utility model relates to a serial battery pack charge balance system which comprises a serial battery pack, a charging power supply, a battery voltage monitoring module, an energy overflow module, a charging energy entry limit control module and a main control module; when the battery voltage monitoring module detects that the voltage of a battery reaches the balance start voltage, the energy overflow module shunts the battery, so that the battery keeps the balance start voltage; and simultaneously, the charging energy entry limit control module controls the charging current, continues to charge single batteries which do not reach the balance start voltage, until all batteries in the battery pack are fully charged. The serial battery pack charge balance system has the advantages that the balance degree is high, the utilization rate of the batteries is high, the circuit cost is low, the service life of the battery pack is long, and the like.
Description
Technical field
The utility model relates to the series battery charge technology, relate in particular to the series battery charge balance sysmte, be applicable to the battery pack of employed many battery series connection such as pure electric automobile, mixed power electric car, fuel cell electric vehicle, electric ship, backup type communication power supply, NB battery and electric tool.
Background technology
For including multiple batteries series connected battery group, because cell degree of aging and temperature influence difference, the state of every joint cell is just inconsistent; Along with the increase that discharges and recharges number of times, the voltage difference between battery can increase gradually, forms the imbalance between battery, thereby causes the battery pack lost of life.When battery pack is carried out the discharge of a period of time with big electric current, if the imbalance between the battery acquires a certain degree, the polarization reaction meeting that produces on the cell of capacity minimum causes nonvolatil damage to this battery pack, so whether balance plays crucial effects for the useful life and the effect of battery pack between the cell.
In the market for the charging balancing management of series battery, generally in the following ways:
1. adopt terminal management of balance mode
When any joint monomer battery voltage reaches the constant voltage charge voltage U ch of electric core requirement in the battery pack; the low discharging current branch road is incorporated in the battery two ends that reach Uch; when any joint monomer battery voltage reaches the over-charge protective voltage U ov of electric core requirement in the battery pack; need cut off charge circuit immediately, prevent that battery from causing safety problem owing to overcharging.Because the imbalance between battery; the whole group of battery voltage does not reach corresponding charging voltage; this causes charging current much larger than the discharge paths electric current of incorporating into; under the effect of big electric current; the very short (see figure 1) of time t of the over-charge protective voltage U ov that battery requires from Uov to electric core; this shown battery can balance capacity seldom, this is difficult to solve the capacity volume variance problem between battery in actual applications.
2. adopt management of balance mode in mid-term
This way to manage is to reach a certain value Uba1 (Uba1 is the balance start-up point, Uba1 " Uch) at cell just to begin to carry out low discharging current, prolonged the battery equilibrium time, but the charging curve of battery is inconsistent.Figure 2 shows that the charging curve of A in the battery pack, B battery, charge normal under the situation, the voltage of the voltage ratio battery B of battery A arrives the Uba1 point earlier, therefore system will carry out low discharging current to the A battery, and from charging curve as can be seen, the charging interval of original A battery will be longer than the charging interval of B battery (t2＞t1), but because the A battery carries out low discharging current earlier, reduced the electric current of actual inflow A battery, prolonged the A battery and be full of the needed charging interval, finally cause A, B battery capacity volume variance than balance before the capacity volume variance of A, B battery also big.By this scheme, the voltage difference between the battery of not only not furthering has been aggravated the voltage difference between the battery on the contrary, thereby has been caused the further difference on the capacity.
The utility model content
The purpose of this utility model is, a kind of series battery charge balance sysmte is provided, to solve the capacity volume variance problem between the cell in the battery pack in the charging process of series battery.
The series battery charge balance sysmte that the utility model provides comprises series battery and charge power supply, series battery comprises a plurality of series connected battery, this system also comprises: the battery voltage monitoring module, it comprises the battery voltage monitoring submodule that equates with number of batteries, each battery voltage detection submodule is connected with a battery separately, is used to monitor the voltage of connected battery; Energy overflows module, and it energy that comprises that quantity equates with number of batteries overflows submodule, and each energy overflows submodule and is connected with a battery separately, and energy overflows submodule and comprises the electronic switch one (SW) that is connected in series and divide current load; Rechargeable energy is limit into control module, and an end of itself and series battery and charge power supply are used for the electric current of charge circuit is controlled in succession; Main control module, it overflows module and rechargeable energy with battery voltage monitoring module, energy respectively limits into control module and is electrically connected, and comes control energy to overflow submodule and rechargeable energy is limit into control module according to the detected voltage condition of battery voltage monitoring submodule.
Existing relatively technology the utlity model has following technique effect:
1. but the degree of balance is big, can realize the battery pack balance (being to have at least a joint to be full of a battery and a joint emptying battery in the battery pack) under the most abominable poised state;
2. because after the balance startup, low current charge is carried out to battery pack in the loop, has guaranteed that all cells are full of fully, have improved the battery utilization ratio;
3. by to the control of charging current with the cell charging current that reaches predetermined charging voltage is carried out by-pass shunt realize balance between battery, be very easy to the realization of circuit, improved the stability of system, reduced circuit cost;
4. owing to adopt terminal Balance Control, avoided the influence that causes under the charging curve inconsistent state, help the battery partial volume and join resistance, the production cost of battery pack is descended significantly.
Description of drawings
Fig. 1 is the charge graph of existing terminal management of balance mode;
Fig. 2 is the charge graph of management of balance mode in existing mid-term;
Fig. 3 is the frame circuit diagram of the utility model embodiment one;
Fig. 4 is the frame circuit diagram of the utility model embodiment two;
Below in conjunction with accompanying drawing the utility model is described in detail.
Embodiment
Embodiment one
Referring to Fig. 3, series battery comprises four batteries that are connected in series, and battery preferably adopts lithium battery, and the voltage after each battery charge is 4.2V (volt), so battery pack provides the total voltage of 16.8V.Certainly, 4 lithium batteries that adopted in the present embodiment should not be considered to be restricted, and the utility model can use the battery of any amount, type or capacity.Those skilled in the art recognize that in fact each battery can be to be connected in parallel and to depress the battery of several physics of work in same electrical, the whole volume of a plurality of batteries that are connected in series with raising.Series battery can be to electric device---for example (but being not limited to) electric tool or NB battery---provides power supply.
The battery voltage monitoring module comprises a plurality of battery voltage monitoring submodules, the quantity of battery voltage monitoring submodule is no less than the number of batteries in the series battery, each battery voltage detection submodule is connected with a battery separately by cable, battery voltage detection submodule and cell are set up man-to-man annexation, constantly the voltage condition of the connected single battery of on-line monitoring.The battery voltage supervisory circuit that each battery voltage monitoring submodule can be made up of comparator, reference voltage and interrelated logic circuit.Certainly, the battery voltage monitoring submodule can also be the voltage monitoring electron-like chip that any voltage conforms to, and also can be to use other the similar electric voltage observation circuits that constitute of device and A/D known to pure microprocessor, microcontroller, computer, application-specific integrated circuit (ASIC) (ASIC) or those skilled in the art.
Energy overflows module and comprises that a plurality of energy overflow submodule, the quantity that energy overflows submodule equals the number of batteries in the series battery, each energy overflows submodule and is connected with a battery separately, energy overflows submodule and cell is set up man-to-man annexation, and each energy overflows submodule and comprises electronic switch one SW that is connected in series and divide current load.When energy overflows submodule when effective, electronic switch one SW closure divides current load to shunt; On the contrary, when energy overflowed submodule and forbids, electronic switch one SW disconnected, and divided current load to stop shunting.When a certain cell reached the constant voltage charge voltage of electric core requirement, electronic switch one SW that the corresponding battery energy overflows in the submodule was just closed, by minute current load the battery two ends is shunted, and realizes that unnecessary electric energy overflows; In case when this monomer battery voltage was lower than the constant voltage charge voltage of battery oneself requirement, electronic switch one SW that corresponding energy overflows in the submodule just disconnected, and ended the energy content of battery and overflowed.The realization of electronic switch one SW is not limited to be implemented by dissimilar transistors, dissimilar field-effect transistor, relay or other suitable switching devices, also comprises carrying out switching signal on the logical meaning of break-make to minute current load.The realization of branch current load is not limited to resistance, the electronic simulation resistance of power consumption, and also comprising can be to the DC/DC device of entire cell feed.In addition, the operation of electronic switch one SW (with other switches) herein can be called as " disconnection ", " closure ", " leading to ", " breaking " etc. in this application, as the custom that is used for mechanical switch.Yet doing like this is statement for convenience, and electronic switch one SW should be interpreted as physical switch.
Rechargeable energy is limit into control module and is connected with charge power supply with the positive terminal of series battery, is used to realize the Current Control of whole charge circuit, thereby reaches the purpose that the rechargeable energy restriction enters.The utility model provides two kinds of execution modes, but is not limited thereto.In the present embodiment, rechargeable energy is limit into control module and is comprised electronic switch two KCH, electronic switch three KOC and current-limiting circuit, and current-limiting circuit is connected in series with electronic switch three KOC earlier, is connected in parallel with electronic switch two KCH more afterwards.When electronic switch two KCH are effective, the switch ends circuit will be connected, and promptly charge power supply of battery (or adapter) directly is communicated with battery pack.On the contrary, when electronic switch two KCH are under an embargo, the switch ends circuit will be disconnected.Preferably, utilize transistor to realize electronic switch two KCH, thereby can realize changing and need not movable part (i.e. " solid-state " realization) by the TURP that electronic switch two KCH carry out.More preferably, electronic switch two KCH are implemented as Metal Oxide Silicon Field Effect Transistor (MOSFET).Use MOSFET rather than mechanical type or relay system switch, greatly reduce the implementation cost of system.Yet electronic switch two KCH also can adopt dissimilar transistors, dissimilar field-effect transistor, relay or other suitable switching devices to implement.The realization of electronic switch three KOC is identical with electronic switch two KCH.Current-limiting circuit is not limited to resistance, electronic simulation resistance, also comprises the low pressure reduction power circuit of being with current-limiting function.Preferentially, current-limiting circuit is low pressure reduction constant-current source.In the present embodiment, system realizes the rechargeable energy management and control by disconnecting electronic switch two KCH and closed electronic switch three KOC and starting current-limiting circuit.
Main control module overflows module and rechargeable energy with battery voltage monitoring module, energy respectively to be limit into control module and is electrically connected, main control module can be other the similar devices known to microprocessor, microcontroller, computer, application-specific integrated circuit (ASIC) (ASIC) or those skilled in the art, also can be logical circuit.Main control module is used for the operation of each parts of system is controlled, and it obtains the information of voltage of each cell from the battery voltage monitoring submodule, these information is handled, and energy is overflowed module and rechargeable energy limit into control module and control.
Embodiment two
Most of structure of present embodiment is identical with embodiment one, its difference only is that rechargeable energy limits into control module, referring to Fig. 4, in this embodiment, it is electronic switch two (KCH) that rechargeable energy is limit into control module, and when charging normal, main control module is with electronic switch two (KCH) closure, and when current-limiting charge, main control module realizes that by the make-and-break time of electronic switch two (KCH) is controlled the charge number that charge circuit in the unit interval is provided carries out management and control.
Claims (7)
1. the series battery charge balance sysmte comprises series battery and charge power supply, and series battery comprises a plurality of series connected battery, it is characterized in that, described system also comprises:
The battery voltage monitoring module, it comprises the battery voltage monitoring submodule that equates with number of batteries, each battery voltage detection submodule is connected with a battery separately, is used to monitor the voltage of connected battery;
Energy overflows module, and it energy that comprises that quantity equates with number of batteries overflows submodule, and each energy overflows submodule and is connected with a battery separately, and energy overflows submodule and comprises the electronic switch one (SW) that is connected in series and divide current load;
Rechargeable energy is limit into control module, and an end of itself and series battery and charge power supply are used for the electric current of charge circuit is controlled in succession;
Main control module, it overflows module and rechargeable energy with battery voltage monitoring module, energy respectively limits into control module and is electrically connected, and comes control energy to overflow submodule and rechargeable energy is limit into control module according to the detected voltage condition of battery voltage monitoring submodule.
2. series battery charge balance sysmte according to claim 1, it is characterized in that, described rechargeable energy is limit into control module and is comprised electronic switch two (KCH), electronic switch three (KOC) and current-limiting circuit, and current-limiting circuit is connected in parallel with electronic switch two after being connected in series with electronic switch three earlier again.
3. series battery charge balance sysmte according to claim 2 is characterized in that, described electronic switch one (SW), electronic switch two (KCH) and electronic switch three (KOC) are transistor or relay.
4. series battery charge balance sysmte according to claim 3 is characterized in that, described electronic switch two (KCH) is a Metal Oxide Silicon Field Effect Transistor.
5. series battery charge balance sysmte according to claim 3 is characterized in that, described battery voltage monitoring submodule is the battery voltage supervisory circuit of being made up of comparator, reference voltage and logical circuit.
6. series battery charge balance sysmte according to claim 3 is characterized in that, described current-limiting circuit is resistance, electronic simulation resistance or comprises the low pressure reduction power circuit of being with current-limiting function.
7. series battery charge balance sysmte according to claim 1 is characterized in that, it is electronic switch two (KCH) that described rechargeable energy is limit into control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206713917U CN201893589U (en) | 2010-12-14 | 2010-12-14 | Serial battery pack charge balance system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206713917U CN201893589U (en) | 2010-12-14 | 2010-12-14 | Serial battery pack charge balance system |
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| CN201893589U true CN201893589U (en) | 2011-07-06 |
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| CN2010206713917U Expired - Fee Related CN201893589U (en) | 2010-12-14 | 2010-12-14 | Serial battery pack charge balance system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064580A (en) * | 2010-12-14 | 2011-05-18 | 宁波飞驰达电子科技发展有限公司 | Series connected battery pack charging balance system and charging balance method thereof |
| CN102394489A (en) * | 2011-11-21 | 2012-03-28 | 上海微频莱机电科技有限公司 | Charging power supply protection circuit |
| CN102647010A (en) * | 2012-05-08 | 2012-08-22 | 无锡艾立德智能科技有限公司 | Four-series-lithium-battery-cell charge equalization control chip and control circuit thereof |
| CN110401237A (en) * | 2019-06-15 | 2019-11-01 | 深圳市瑞鼎电子有限公司 | Battery pack balance charging method and system |
-
2010
- 2010-12-14 CN CN2010206713917U patent/CN201893589U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064580A (en) * | 2010-12-14 | 2011-05-18 | 宁波飞驰达电子科技发展有限公司 | Series connected battery pack charging balance system and charging balance method thereof |
| CN102394489A (en) * | 2011-11-21 | 2012-03-28 | 上海微频莱机电科技有限公司 | Charging power supply protection circuit |
| CN102647010A (en) * | 2012-05-08 | 2012-08-22 | 无锡艾立德智能科技有限公司 | Four-series-lithium-battery-cell charge equalization control chip and control circuit thereof |
| CN110401237A (en) * | 2019-06-15 | 2019-11-01 | 深圳市瑞鼎电子有限公司 | Battery pack balance charging method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110706 Termination date: 20141214 |
|
| EXPY | Termination of patent right or utility model |