CN104901373A - Balanced charger and balanced charging method - Google Patents
Balanced charger and balanced charging method Download PDFInfo
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- CN104901373A CN104901373A CN201510304509.XA CN201510304509A CN104901373A CN 104901373 A CN104901373 A CN 104901373A CN 201510304509 A CN201510304509 A CN 201510304509A CN 104901373 A CN104901373 A CN 104901373A
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Abstract
The invention discloses a balanced charger and a balanced charging method. The balanced charger comprises a battery pack (30), a charging management circuit (10), and a charging control circuit (20). The battery pack (30) includes at least two batteries connected in series. The charging management circuit (10) is connected with the charging control circuit (20). The battery pack (30) is connected with the charging control circuit (20). The charging management circuit (10) is used to realize constant-pressure constant-current charging of the batteries. The charging control circuit (20) is used to detect the voltage of each battery in the battery pack (30) and alternately charge the batteries based on the detection result until all the batteries are fully charged. By adopting the balanced charger and the balanced charging method of the invention, charging and discharging of multiple lithium ion batteries is realized, the cost is reduced, the difficulty of detection is lowered, the adaptability of voltage is improved, battery matching is made convenient, reverse connection of batteries is prevented, and over-charge, over-discharge and over-current are prevented.
Description
Technical field
The present invention relates to battery charging field, more particularly, relate to a kind of balance-type charger and method.
Background technology
Lithium ion battery is a kind of secondary cell (rechargeable battery), has that energy density is large, power output is high, the discharge and recharge life-span is long, pollution-free, operating temperature range is wide and the plurality of advantages such as self discharge is little.
Due to the monomer voltage of lithium ion battery low (being generally 4.2V, 3.6V), usually through series connection way to obtain required nominal voltage (such as 12V).For playing the optimum performance of whole battery pack, producer needs to carry out special pairing equilibrium to battery cell and waits uniformity test before dispatching from the factory, finally just can be assembled into required battery pack.So battery pack uses the initial stage, and be generally more balanced, performance is better.But battery pack is along with the increase of charge and discharge cycles number of times, or battery pack long-term storage, lack maintenance, due to the continuous change of the internal resistance of battery, capacity, self-discharge rate, the performance of battery cell there will be larger change, the performance of whole battery pack will be deteriorated gradually, and the unbalanced situation of battery will be more and more serious.
In addition, lithium ion battery is due to its inner unique electrochemical properties, and chemical composition is very active, does not allow over-charging of battery, mistake is put, overcurrent, otherwise can damage battery, even occur safety problem.So, no matter be monomer or battery pack, all need to be combined with special battery management system (BMS:Battery Management System) and just can use.
The structure chart of traditional lithium-ion battery charger as shown in Figure 1.Traditional charging method, each lithium ion battery needs connection one BMS to carry out charge and discharge protecting.And when there being multiple lithium ion battery to connect, the voltage of the charge power supply of employing is the summation of all cell voltages (such as, the lithium ion battery series connection of two 4.2V, need adopt the charge power supply of 8.4V to charge to it).
Therefore, traditional charging method have management detect difficult, charge power supply voltage adaptability is poor, high in cost of production defect.
Prior art existing defects, needs to improve.
Summary of the invention
The technical problem to be solved in the present invention is, the above-mentioned lithium ion battery equalizing charge technical management for prior art detects the defect difficult, cost is high, provides a kind of balance-type charger and method.
The technical solution adopted for the present invention to solve the technical problems is: on the one hand, provides a kind of balance-type charger, comprising: battery pack, charge management circuit and charging control circuit;
Described battery pack comprises at least two batteries be connected in series;
Described charge management circuit is connected with described charging control circuit; Described battery pack is connected with described charging control circuit;
Described charge management circuit is for realizing the constant voltage constant current charging of described battery;
Described charging control circuit for detecting the voltage of described battery in battery pack, and carries out alternately charging, until each battery is all full of electricity based on testing result to each battery.
Preferably, described charging control circuit comprises the detection comparison circuit and multiple switching circuit be connected with each battery respectively that are connected with described charge management circuit and battery pack respectively;
Described detection comparison circuit is used for the cell voltage detected to compare between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Preferably, described charging control circuit comprises the detection comparison circuit and multiple switching circuit be connected with each battery respectively that are connected with described charge management circuit and battery pack respectively;
Described detection comparison circuit is used for the voltage detected to compare, and sort according to voltage levels according to the voltage of comparative result by each battery, and select the corresponding switching circuit of conducting with from the minimum battery of voltage successively charging, the voltage difference of each battery and the highest battery of voltage is made to be preset difference value, then the voltage of each battery is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Preferably, described balance-type charger also comprises: charge-discharge protection circuit;
Described charge-discharge protection circuit is connected with described battery pack and charging control circuit respectively;
Described charge-discharge protection circuit is for detecting cell voltage in charging process to carry out over-charge protective, and the electric current detected in battery discharge procedure and cell voltage are to carry out overcurrent and Cross prevention; Whether described charge-discharge protection circuit also connects instead for detecting battery, if connect anti-, disconnects charging path or discharge path.
Preferably, described charge-discharge protection circuit comprises: reverse-connection preventing circuit, overcharge protection circuit, mistake are put and current foldback circuit;
Wherein, reverse-connection preventing circuit is connected with described battery pack; Overcharge protection circuit is respectively with described battery pack and detect comparison circuit and be connected; Cross and to put and current foldback circuit is connected with described battery pack.
Preferably, described battery pack comprises: the first battery be connected in series and the second battery;
Described charging control circuit comprises: the first switching circuit, second switch circuit, the 3rd switching circuit, the 4th switching circuit and detection comparison circuit;
Described charge management circuit is connected with described detection comparison circuit; Described first switching circuit is connected with described detection comparison circuit and described first battery respectively; Described second switch circuit is connected with described detection comparison circuit and described first battery respectively; Described 3rd switching circuit is connected with described detection comparison circuit and described second battery respectively; Described 4th switching circuit is connected with described detection comparison circuit and the second battery respectively;
Described detection comparison circuit is connected with described first battery and the second battery respectively;
Described detection comparison circuit for detecting and the voltage of more described first battery and the second battery, and selects the first switching circuit described in conducting and second switch circuit to charge to described first battery or to select the 3rd switching circuit described in conducting and the 4th switching circuit to charge to described second battery.
Preferably, described charge management circuit comprises: charging chip; The model of described charging chip is CX4056;
Described detection comparison circuit comprises: operational amplifier, sampling resistor R6, sampling resistor R7, sampling resistor R8, resistance R5, electric capacity C3, electric capacity C4, triode Q1 and triode Q2;
Described first switching circuit comprises: field effect transistor Q6;
Described second switch circuit comprises: field effect transistor Q5;
Described 3rd switching circuit comprises: field effect transistor Q3 and field effect transistor Q9;
Described 4th switching circuit comprises: field effect transistor Q4;
4th pin of charging chip is connected with external charging power supply with the 3rd pin; 5th pin of charging chip is connected with the drain electrode of field effect transistor Q6;
The in-phase input end of operational amplifier is connected with one end of electric capacity C4 through resistance R5, and the other end of C4 is connected with the inverting input of operational amplifier through resistance R4; The in-phase input end of operational amplifier is connected with one end of electric capacity C4 through electric capacity C3; The output of operational amplifier is connected with the base stage of triode Q1, and the output of operational amplifier is connected with the base stage of triode Q2; The collector electrode of triode Q1 is connected with the grid of field effect transistor Q4; The source ground of field effect transistor Q4; The drain electrode of field effect transistor Q4 is connected with the drain electrode of field effect transistor Q5, the grounded-grid of field effect transistor Q5, and is connected with the collector electrode of triode Q2 and the grid of field effect transistor Q6 respectively; The grid of field effect transistor Q5 is connected with the source electrode of field effect transistor Q6; The source electrode of field effect transistor Q5 is connected with the negative pole of the second battery; The drain electrode of field effect transistor Q5 is connected with the 5th pin of charging chip through electric capacity C2;
The source electrode of field effect transistor Q3 is connected with the source electrode of the source electrode of field effect transistor Q7 and field effect transistor Q9; The drain electrode of field effect transistor Q3 is connected with the drain electrode of field effect transistor Q6; The grid of field effect transistor Q3 is connected with the positive power source terminal of operational amplifier through resistance R16;
The emitter of triode Q2 is connected with the positive power source terminal of operational amplifier; The base stage of triode Q2 is connected with the positive power source terminal of operational amplifier; One end of sampling resistor R6 is connected with the positive power source terminal of operational amplifier, and the other end is through sampling resistor R7 ground connection;
The inverting input of operational amplifier is connected with the node between sampling resistor R6 and sampling resistor R7;
The base stage of triode Q1 is connected with the 5th pin of charging chip;
The grid of field effect transistor Q4 is connected with the grid of field effect transistor Q3;
The source electrode of field effect transistor Q6 is connected with the positive pole of the second battery;
The source electrode of field effect transistor Q9 is connected with the source electrode of field effect transistor Q3, and the drain electrode of field effect transistor Q9 is connected with the positive pole of the first battery; The grounded-grid of field effect transistor Q9; The minus earth of the first battery.
Preferably, described reverse-connection preventing circuit comprises: field effect transistor Q7, triode Q8 and field effect transistor Q9;
The drain electrode of field effect transistor Q7 is connected with the negative pole of the second battery; The source electrode of field effect transistor Q7 is connected with the source electrode of field effect transistor Q9; The grid of field effect transistor Q7 is connected with the collector electrode of triode Q8; The grid of field effect transistor Q9 is connected with the collector electrode of triode Q8; The base stage of triode Q8 is connected with the negative pole of the first battery through resistance R20, and the emitter of triode Q8 is connected with the drain electrode of field effect transistor Q9, and the collector electrode of triode Q8 is through resistance R20 ground connection.
On the other hand, a kind of balance-type charging method is provided, comprises:
The voltage of S1, detection battery;
S2, based on testing result, alternately charging is carried out, until each battery is all full of electricity to each battery.
Preferably, described step S2 specifically comprises:
The cell voltage detected is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity;
Or
Described step S2 specifically comprises:
The voltage detected is compared, and sort according to voltage levels according to the voltage of comparative result by each battery, and select the corresponding switching circuit of conducting with from the minimum battery of voltage successively charging, the voltage difference of each battery and the highest battery of voltage is made to be preset difference value, then the voltage of each battery is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Implement balance-type charger of the present invention and method, there is following beneficial effect: alternately charging is carried out to battery and detects, cost-saved, reduce detection difficulty.And owing to carrying out alternately charging to battery, the voltage of the voltage of charge power supply only demand fulfillment single battery, improves the adaptability of voltage.In addition, adopt the balance-type charger of the embodiment of the present invention that battery can be made to match convenient, there will not be because lithium ion battery is connected the disequilibrium problem occurred.The balance-type charger of the embodiment of the present invention and method also have anti-reverse, overcharge, cross put and overcurrent protection function, substantially increase battery charging fail safe; Do not adopt booster circuit to carry out high-voltage charging, avoid producing high frequency radiation.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structure chart of traditional lithium-ion battery charger;
Fig. 2 is the structural representation of the balance-type charger of the embodiment of the present invention;
Fig. 3 is the structural representation of the balance-type charger of a preferred embodiment of the present invention;
Fig. 4 is the circuit structure diagram of the charger of balance-type shown in Fig. 3;
Fig. 5 is the flow chart of the balance-type charging method of the embodiment of the present invention.
Embodiment
The embodiment of the present invention is by providing a kind of balance-type charger and method; solve lithium ion battery equalizing charge technical management in prior art and detect the defect difficult, cost is high; achieve and only need a charge management circuit, a detection comparison circuit and a discharge protection circuit; the discharge and recharge to multi-section lithium ion battery can be realized, cost-saving, reduce detection difficulty, carry high-tension adaptability, make battery match convenient, prevent battery reversal connection, prevent from overcharging, preventing from putting and preventing the technique effects such as overcurrent.
The general thought that the embodiment of the present invention solves the problems of the technologies described above is as follows: adopt a charging control circuit 20 to detect the voltage of each battery, and carries out alternately charging, until each battery is all full of electricity based on testing result to each battery.Adopt a charge-discharge protection circuit 40 to carry out the overcharging of battery, cross put, overcurrent protection and prevent battery reversal connection.
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
See Fig. 2, it is the structural representation of the balance-type charger of the embodiment of the present invention.The balance-type charger of the embodiment of the present invention comprises: charge management circuit 10, charging control circuit 20, battery pack 30 and charge-discharge protection circuit 40.Battery pack 30 comprises at least two batteries be connected in series (such as, lithium ion battery).
Charge management circuit 10 is connected with charging control circuit 20; Battery pack 30 is connected with charging control circuit 20; Charge-discharge protection circuit 40 is connected with battery pack 30 and charging control circuit 20 respectively.
Charge management circuit 10 is for realizing the constant voltage constant current charging of battery.
Charging control circuit 20 for detecting the voltage of each battery, and carries out alternately charging, until each battery is all full of electricity based on testing result to each battery.Concrete, charging control circuit 20 comprises the detection comparison circuit 25 and multiple switching circuit (in figure non-label) be connected with each battery respectively that are connected with charge management circuit 10 and battery pack 30 respectively.
Charge-discharge protection circuit 40 is for detecting cell voltage in charging process to carry out over-charge protective, and the electric current detected in discharge process and cell voltage are to carry out overcurrent and Cross prevention.
Whether charge-discharge protection circuit 40 also connects instead for detecting battery, if connect reversal connection, disconnects charging path or discharge path.Concrete, charge-discharge protection circuit 40 comprises: reverse-connection preventing circuit 41, overcharge protection circuit 42, mistake are put and current foldback circuit 43; Wherein, reverse-connection preventing circuit 41 is connected with battery pack 30; Overcharge protection circuit 42 is respectively with battery pack 30 and detect comparison circuit 25 and be connected; Cross and to put and current foldback circuit 43 is connected with battery pack 30.
Concrete, in the embodiment of the present invention, the detection comparison circuit 25 in charging control circuit 20 is for carrying out the alternately charging of battery according to following either type:
Mode 1: the cell voltage detected is compared between two, and according to comparative result, select conducting corresponding switching circuit to think the battery charging that voltage is lower and charge capacity be preset charged threshold value (such as, 0.1V), if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Mode 2: detect comparison circuit and be used for the voltage detected to compare, and according to comparative result, the voltage of each battery is carried out sorting (such as according to voltage levels, ranking results is battery B2, battery B3, battery B1 ...), and select the corresponding switching circuit of conducting with from the minimum battery of voltage (such as, for battery B2) start charging successively, make each battery and the highest battery of voltage (such as, for battery B3) voltage difference be preset difference value (such as, 0.2V), then the voltage of each battery is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
According to the embodiment of the present invention, preferably, if the number of battery is two, then the alternately charging modes detecting comparison circuit 25 can simplify as follows:
Mode 1: two cell voltages detected are compared, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Mode 2: the voltage detected is compared, and the switching circuit of the battery selecting voltage lower charges with the battery low to voltage, makes the voltage of this battery and the voltage difference of another battery be preset difference value; Then, according to mode (1), the voltage of two batteries is compared, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, then the corresponding switching circuit of conducting is selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Should understand, above-mentioned alternately charging modes is only schematic, in addition, other mode also can be adopted to carry out alternately charging, such as, sequence alternate charging (B1, B2, B3 ... cycle alternation charging successively), interval alternately charging (B1, B3, B2, B4 ... the charging of interval cycle alternation) etc. alternately charging modes all in the covering scope of the alternately charging of the embodiment of the present invention.
Below with reference to Fig. 3 and Fig. 4, for two joint lithium ion battery series connection, the balance-type charger of the embodiment of the present invention is described in detail.
See Fig. 3, the battery pack 30 of the embodiment of the present invention comprises: the first battery 31 and the second battery 32 be connected in series.Wherein, charging control circuit 20 comprises: the first switching circuit 21, second switch circuit 22, the 3rd switching circuit 23, the 4th switching circuit 24 and detection comparison circuit 25.
Wherein, charge management circuit 10 is connected with detection comparison circuit 25; First switching circuit 21 is connected with detection comparison circuit 25 and the first battery 31 respectively; Second switch circuit 22 is connected with detection comparison circuit 25 and the first battery 31 respectively; 3rd switching circuit 23 is connected with detection comparison circuit 25 and the second battery 32 respectively; 4th switching circuit 24 is connected with detection comparison circuit 25 and the second battery 32 respectively.First switching circuit 21, second switch circuit 22, the 3rd switching circuit 23 are also connected with charge-discharge protection circuit 40 respectively with the 4th switching circuit 24.Charge-discharge protection circuit 40 is connected with the first battery 31.Charge-discharge protection circuit 40 is connected with the second battery 32.
Detect comparison circuit 25 to be connected with the first battery 31, and be connected with the connected node between the first battery 31 and the second battery 32.
When charging to the first battery 31 and the second battery 32, detect comparison circuit 25 detect and compare the voltage of the first battery 31 and the second battery 32, and according to the above-mentioned corresponding switching circuit of modes selecting conducting (the first switching circuit 21, second switch circuit 22, the 3rd switching circuit 23 and the 4th switching circuit 24), to give the alternately charging of the first battery 31 and the second battery 32.When the first switching circuit 21 and 22 conducting of second switch circuit, charge to the first battery 31.When the 3rd switching circuit 23 and the 4th switching circuit 24 conducting, charge to the second battery 32.
Concrete, in this embodiment, preset charged threshold value and preset difference value all can be set to 0.1V.Such as, when charging starts, the voltage of the first battery 31 is 2V, the voltage of the second battery 32 is 2.2V, if then 1 carry out alternately charging in a manner mentioned above, is then first that the first battery 31 charges after 0.1V, the voltage of the first battery 31 is still less than the voltage of the second battery 32, be then its charging 0.1V again; Now, the voltage of the first battery 31 is equal with the voltage of the second battery 32, then select wherein that a battery is (such as, first battery 31) be its charging 0.1V, after this, be then another battery (such as, second battery 32) charging 0.1V, replace thus, until two batteries are all full of electricity (such as, 4.2V).If 2 carry out alternately charging in the manner described above, be first then that the first battery 31 charges 0.3V (now, the voltage difference of the first battery 31 and the second battery 32 is 0.1V), after this, be that the second battery 32 charges 0.1V, be that the first battery 31 charges 0.1V afterwards, replace thus, until two batteries are all full of electricity.
Charge-discharge protection circuit 40 is respectively with the first battery 31, second battery 32 with detect comparison circuit 25 and be connected.In specific works process, charge-discharge protection circuit 40 is for detecting cell voltage in charging process to carry out over-charge protective, and the electric current detected in discharge process and cell voltage are to carry out overcurrent and Cross prevention.Whether charge-discharge protection circuit 40 also connects instead for detecting battery, if connect anti-, disconnects charging path or discharge path.
The balance-type charger of the embodiment of the present invention, only needs the charging that a charge management circuit and detection comparison circuit can realize multi-section lithium ion battery, saves cost, and detect simple and convenient.On the other hand, owing to only charging to a battery simultaneously, the voltage of charge power supply need not be the total voltage of multi-section lithium ion battery, and such as, adopt the charge power supply of 5V namely to can be the lithium ion cell charging of two joint 4.2V, the adaptability of charge power supply is strong.In addition, adopt the balance-type charger of the embodiment of the present invention that battery can be made to match convenient, there will not be because lithium ion battery is connected the disequilibrium problem occurred.The balance-type charger of the embodiment of the present invention also have anti-reverse, overcharge, cross and put and overcurrent protection function, substantially increase the fail safe of battery charging.
See the circuit diagram of Fig. 4 for the balance-type charger shown in Fig. 3.Wherein, charge management circuit 10 comprises: charging chip IC1, triode Q18, field effect transistor Q17, voltage stabilizing didoe DZ1.The model of charging chip IC1 is CX4056.
Detect comparison circuit 25 to comprise: operational amplifier IC2, sampling resistor R6, sampling resistor R7, sampling resistor R8, triode Q1, triode Q2;
First switching circuit 21 comprises: field effect transistor Q6;
Second switch circuit 22 comprises: field effect transistor Q5;
3rd switching circuit 23 comprises: field effect transistor Q3, field effect transistor Q9;
4th switching circuit 24 comprises: field effect transistor Q4;
Reverse-connection preventing circuit 41 comprises: field effect transistor Q7, triode Q8 and field effect transistor Q9; Overcharge protection circuit 42 comprises: battery protection chip IC3, triode Q12, triode Q13, triode Q14, triode Q15 and triode Q16; Cross and to put and current foldback circuit 43 comprises: triode Q10, triode Q11, K switch 1.K switch 1 comprises the 1st end, the 2nd end and the 3rd end.The model of battery protection chip IC3 is DW01+.
Concrete, the 4th pin of charging chip IC1 is connected with external charging power supply with the 3rd pin.The base stage of triode Q18 is connected with the negative electrode of voltage stabilizing didoe DZ1 through resistance R41, and the collector electrode of triode Q18 is connected with the grid of field effect transistor Q17, and through resistance R42 ground connection.The emitter of triode Q18 is connected with the source electrode of field effect transistor Q17.The drain electrode of field effect transistor Q17 is through electric capacity C1 ground connection.4th pin of charging chip IC1 is connected with the drain electrode of field effect transistor Q17 with the 8th pin, and is connected with the anode of light-emitting diode D3.The negative electrode of light-emitting diode D3 is connected with the 7th pin of charging chip IC1 by resistance R2.The drain electrode of field effect transistor Q17 is connected with the anode of light-emitting diode D2, and the negative electrode of light-emitting diode D2 is connected with the 6th pin of charging chip IC1 by resistance R1.5th pin of charging chip IC1 is connected with the drain electrode of field effect transistor Q6.The source electrode of field effect transistor Q17 is connected with external charging power supply.Light-emitting diode D2 and D3 is respectively used to carry out charging complete instruction and charged state instruction.Voltage stabilizing didoe DZ1 is used for voltage stabilizing.
The in-phase input end of operational amplifier IC2 is connected with one end of electric capacity C4 through resistance R5, and the other end of C4 is connected with the inverting input of operational amplifier IC2 through resistance R4.The in-phase input end of operational amplifier IC2 is connected with one end of electric capacity C4 through electric capacity C3.The in-phase input end of operational amplifier IC2 is connected with the emitter of triode Q11 through resistance R8.The output of operational amplifier IC2 is connected with the base stage of triode Q1 through resistance R11, and the output of operational amplifier IC2 is connected with the base stage of triode Q2 through resistance R10, and the output of operational amplifier IC2 is connected with the emitter of triode Q11 through resistance R9.The collector electrode of triode Q1 is connected with the grid of field effect transistor Q4.The source ground of field effect transistor Q4.
The drain electrode of field effect transistor Q4 is connected with the drain electrode of field effect transistor Q5, and the grid of field effect transistor Q5 through resistance R18 ground connection, and is connected with the collector electrode of triode Q2 and the grid of field effect transistor Q6 respectively.The grid of field effect transistor Q5 is connected with the source electrode of field effect transistor Q6 through resistance R19.The source electrode of field effect transistor Q5 is connected with the negative pole of battery BT2 (i.e. the second battery 32).The source electrode of field effect transistor Q6 is connected with one end of battery output.The other end ground connection of battery output.
The drain electrode of field effect transistor Q5 is connected with the 5th pin of charging chip IC1 through electric capacity C2.
The source electrode of field effect transistor Q3 is connected with the source electrode of the source electrode of field effect transistor Q7 and field effect transistor Q9.The drain electrode of field effect transistor Q3 is connected with the drain electrode of field effect transistor Q6.The grid of field effect transistor Q3 is connected with the positive power source terminal of operational amplifier IC2 through resistance R16.
The emitter of triode Q2 is connected with the positive power source terminal of operational amplifier IC2.The base stage of triode Q2, respectively through resistance R15 ground connection, is connected with the positive power source terminal of operational amplifier IC2 through resistance R14.
One end of resistance R6 is connected with the positive power source terminal of operational amplifier IC2, and the other end is through resistance R7 ground connection.
The inverting input of operational amplifier IC2 is connected with the node between resistance R6 and resistance R7 through resistance R4.
The base stage of triode Q1 is connected with the 5th pin of charging chip IC1 through resistance R12, and through resistance R13 ground connection.
The grid of field effect transistor Q4 through resistance R17 ground connection, and is connected with the grid of field effect transistor Q3.
The source electrode of field effect transistor Q6 is connected with the positive pole of battery BT2.
The source electrode of field effect transistor Q9 is connected with the source electrode of field effect transistor Q3, and the drain electrode of field effect transistor Q9 is connected with the positive pole of battery BT1 (i.e. the first battery 31), and is connected with the emitter of triode Q8.The minus earth of battery BT1.The grid of field effect transistor Q9 is connected with the collector electrode of triode Q8, and is connected with the collector electrode of triode Q10 through resistance R21, and through resistance R22 ground connection.The base stage of triode Q8 is through resistance R20 ground connection.
The drain electrode of field effect transistor Q7 is connected with the negative pole of battery BT2.The source electrode of field effect transistor Q7 is connected with the source electrode of field effect transistor Q9.The grid of field effect transistor Q7 is connected with the collector electrode of triode Q10 through resistance R21, and through resistance R22 ground connection.The base stage of triode Q10 is connected with the collector electrode of triode Q12, and is connected with the source electrode of field effect transistor Q6 by resistance R24, and is connected with battery delivery outlet.
The collector electrode of triode Q12 is connected with the collector electrode of triode Q11.The emitter of triode Q12 is connected with the source electrode of field effect transistor Q6, and is connected with battery delivery outlet.The base stage of triode Q12 is connected with the collector electrode of triode Q14 through resistance R30.
The emitter of triode Q11 is connected with the in-phase input end of operational amplifier IC2 through resistance R8, and is connected with the base stage of triode Q11 through resistance R25.The base stage of triode Q11 is through the three-terminal link of resistance R26, electric capacity C9 and K switch 1.Resistance R33 is connected in parallel on electric capacity C9 two ends.
The first end of K switch 1 is connected with the collector electrode of triode Q12 and the base stage of triode Q10 through resistance R29.Electric capacity C8 is connected in parallel on resistance R29 two ends.
Second end of K switch 1 is connected with the source electrode of field effect transistor Q6, and is connected with battery delivery outlet.
The model of battery protection chip IC3 is DW01+, and its 5th pin (VDD pin) is connected with the drain electrode of field effect transistor Q6 through resistance R34, and is connected with the drain electrode of field effect transistor Q5 through electric capacity C10.6th pin (VSS pin) of battery protection chip IC3 is connected with the drain electrode of field effect transistor Q5, and is connected with the second pin (SCI pin) through resistance R35.3rd pin (OC pin) is connected with the base stage of triode Q16 through resistance R39.First pin (OD pin) is connected with the base stage of triode Q15 with electric capacity C11 through resistance R36.
The emitter of triode Q15 is connected with the drain electrode of field effect transistor Q6.The collector electrode of triode Q15 is connected with the base stage of triode Q14 through resistance R32.The base stage of triode Q15 is connected with the drain electrode of field effect transistor Q6 through resistance R37.
The emitter of triode Q16 is connected with the drain electrode of field effect transistor Q6.The collector electrode of triode Q16 is connected with the base stage of triode Q13 through resistance R38.
The collector electrode of triode Q13 is connected with the collector electrode of triode Q8.The grounded emitter of triode Q13.The base stage of triode Q13 is through resistance R28 ground connection.
The collector electrode of triode Q14 is connected with the base stage of triode Q12 through resistance R30.The grounded emitter of triode Q14.The base stage of triode Q14 is through resistance R31 ground connection.
Should be understood that in an embodiment of the present invention, K switch 1 is for controlling the opening and closing of discharge loop.Such as, user according to actual needs, can realize the control to battery discharge by control switch K1, when needs stop electric discharge, and cut-off switch K1.
The operation principle of the balance-type charger of the embodiment of the present invention is: CN1 with CN2 is connected with external charging power supply, for charging chip IC1 provides charging voltage.The in-phase input end of operational amplifier IC2 and reversed-phase output gather the voltage of A point and battery BT2 respectively by resistance R8 and resistance R6, resistance R7, and the two is compared, if A point voltage is higher than the voltage (namely the voltage of battery BT2 is lower than the voltage of battery BT1) of battery BT2, the then output output low level of operational amplifier IC2, triode Q2 conducting, thus, field effect transistor Q6 conducting and field effect transistor Q5 conducting is made; Through the loop that field effect transistor Q6-battery BT2-field effect transistor Q5 forms, charged to the battery BT2 that voltage is lower by the 5th pin of charging chip IC1.If A point voltage is lower than the voltage (namely the voltage of battery BT2 is higher than the voltage of battery BT1) of battery BT2, then the output of operational amplifier IC2 exports high level, and triode Q2 ends, thus, make field effect transistor Q6 conducting and field effect transistor Q5 cut-off, the charging of battery BT2 stops; Triode Q1 conducting, field effect transistor Q3 conducting, field effect transistor Q4 conducting, field effect transistor Q4 conducting, through the loop that field effect transistor Q3, Q9, BT1 and field effect transistor Q4 form, is charged to the battery BT1 that voltage is lower by the 5th pin of charging chip IC1.Thus, by the output of control algorithm amplifier IC2 is voltage, can realize the alternately charging of two batteries, until two batteries are all full of electricity.In charging process, by the stagnant ring be made up of resistance R5 and electric capacity C3, the voltage difference realizing two batteries is the alternately charging of preset difference value (such as, 0.1V), until two batteries are all full of electricity.
In an embodiment of the present invention, CN1 with CN2 is connected with external charging power supply.Preferably, if the voltage of single-unit lithium ion battery is 4.2V, then adopt the charge power supply of common 5V can meet the charging of multi-section lithium ion battery, such as, adopt USB interface namely to charge by computer etc., simple and convenient, promote Consumer's Experience.
Below in conjunction with Fig. 4, introduce the overcharging of the balance-type charger of the embodiment of the present invention in detail, cross put, overcurrent and prevent the concrete principle of reversal connection:
During electric discharge, when after battery BT1 and battery BT2 place in circuit, electric current flows through the 2-3 end of K1 from the positive pole of battery BT2, body diode through resistance R33, resistance R26, resistance R25 and field effect transistor Q7 flows back to the negative pole of battery BT2, thus turn-on transistor Q11, and then turn-on transistor Q10, making field effect transistor Q7, field effect transistor Q9 conducting, just there is the total voltage of battery BT2+ battery BT1 in such CN2 end.
Battery overcharge (superpressure), mistake puts (under-voltage) and overcurrent protection is realized by battery protection chip IC3.In an embodiment of the present invention, the model of battery protection chip IC3 is DW01+, and it is conventional single lithium battery protection IC.
Battery protection chip IC3 can according to the strobed result of operational amplifier IC2 (namely selecting to charge to battery BT1 or charge to battery BT2), monitoring and protection Q6-BT2-Q5 loop (i.e. the charge circuit of battery BT2) and Q3-Q9-BT1-Q4 loop (i.e. the charge circuit of battery BT1).Concrete, if the strobed result of operational amplifier IC2 is for being that battery BT2 charges through Q6-BT2-Q5 loop, then by the voltage that the VDD pin of battery protection chip IC3 detects, the over-charge protective to battery BT2 can be realized; If the strobed result of operational amplifier IC2 for being that battery BT1 charges through Q3-Q9-BT1-Q4 loop, then by the voltage that the VDD pin of battery protection chip IC3 detects, can realize the over-charge protective to battery BT1.Overcharge if occur, then the OC pin output LOW voltage of battery protection chip IC3, thus turn-on transistor Q16 and triode Q13, thus close field effect transistor Q7 and field effect transistor Q9.
In discharge process; battery protection chip IC3 realizes Cross prevention by the sensing voltage of its VDD pin; put if occur; the then OD pin output LOW voltage of battery protection chip IC3; thus turn-on transistor Q15, triode Q14 and triode Q12; triode Q10 is ended, thus closes field effect transistor Q7 and field effect transistor Q9.Battery protection chip IC3 surveys voltage drop (being namely equivalent to electric current) by its SCI pin feel and realizes overcurrent protection; if there is overcurrent; the then OD pin output LOW voltage of battery protection chip IC3; thus turn-on transistor Q15, triode Q14 and triode Q12; triode Q10 is ended, thus closes field effect transistor Q7 and field effect transistor Q9.
In embodiments of the present invention, if battery BT1 reversal connection, then will electric current be had to flow into the base stage of triode Q8 by resistance R20, and flow out from its emitter, thus turn-on transistor Q8, and then move the grid of field effect transistor Q7, field effect transistor Q9 to negative level, close field effect transistor Q7 and field effect transistor Q9.If fruit battery BT2 reversal connection, the turn on process of so above-mentioned triode Q11 cannot be set up field effect transistor Q7 and field effect transistor Q9 and will remain on closed condition.Thus, the reversal connection preventing battery can be realized.
Should be understood that the circuit diagram shown in Fig. 4 is only the circuit diagram of a preferred embodiment of the present invention, realize on the basis of principle at this circuit, also can design multiple different circuit to realize the balance-type charging of the embodiment of the present invention.In addition, the balance-type charger of the embodiment of the present invention is also realized by single-chip microcomputer etc.
The balance-type charger of the embodiment of the present invention only needs a charge management circuit, a detection comparison circuit and a discharge protection circuit; the discharge and recharge to multi-section lithium ion battery can be realized; and do not need all to configure BMS for each battery; do not need for each cell arrangement testing circuit yet; thus; not only can be cost-saving, also can reduce detection difficulty.And owing to carrying out alternately charging to battery, the voltage of the voltage of charge power supply only demand fulfillment single battery, improves the adaptability of voltage.In addition, adopt the balance-type charger of the embodiment of the present invention that battery can be made to match convenient, there will not be because lithium ion battery is connected the disequilibrium problem occurred.The balance-type charger of the embodiment of the present invention also have anti-reverse, overcharge, cross and put and overcurrent protection function, substantially increase the fail safe of battery charging; Do not adopt booster circuit to carry out high-voltage charging, avoid producing high frequency radiation.
It is the flow chart of the balance-type charging method of the embodiment of the present invention see Fig. 5.The balance-type charging method of the embodiment of the present invention comprises the following steps:
S1, detect the voltage of each battery;
S2, based on testing result, alternately charging is carried out, until each battery is all full of electricity to each battery.
Described step S2 specifically comprises:
The cell voltage detected is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
Or described step S2 specifically comprises:
The voltage detected is compared, and sort according to voltage levels according to the voltage of comparative result by each battery, and select the corresponding switching circuit of conducting with from the minimum battery of voltage successively charging, the voltage difference of each battery and the highest battery of voltage is made to be preset difference value, then the voltage of each battery is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
The balance-type charging method of the embodiment of the present invention also comprises:
S3, detect cell voltage in charging process to carry out over-charge protective, and the electric current detected in battery discharge procedure and cell voltage are to carry out overcurrent and Cross prevention;
Whether S4, detection battery connect instead, if connect anti-, disconnect charging path or discharge path.
Should understand, above-mentioned alternately charging modes is only schematic, in addition, other mode also can be adopted to carry out alternately charging, such as, sequence alternate charging (B1, B2, B3 ... cycle alternation charging successively), interval alternately charging (B1, B3, B2, B4 ... the charging of interval cycle alternation) etc. alternately charging modes all in the covering scope of the alternately charging of the embodiment of the present invention.
The details that realizes of the balance-type charging method of the embodiment of the present invention embodies in the description of above-mentioned balance-type charger, is not described in detail in this.
Should be understood that the present invention can by hardware, software, or soft and hardware combines and realizes.Each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize (such as, by chip microcontroller).
In flow chart or any process otherwise described in an embodiment of the present invention or method describe and can be understood to, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by those skilled in the art described in embodiments of the invention.
The balance-type charger of the embodiment of the present invention and method, carry out alternately charging to battery and detect, cost-saved, reduces detection difficulty.And owing to carrying out alternately charging to battery, the voltage of the voltage of charge power supply only demand fulfillment single battery, improves the adaptability of voltage.In addition, adopt the balance-type charger of the embodiment of the present invention that battery can be made to match convenient, there will not be because lithium ion battery is connected the disequilibrium problem occurred.The balance-type charger of the embodiment of the present invention and method also have anti-reverse, overcharge, cross put and overcurrent protection function, substantially increase battery charging fail safe; Do not adopt booster circuit to carry out high-voltage charging, avoid producing high frequency radiation.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. a balance-type charger, is characterized in that, comprising: battery pack (30), charge management circuit (10) and charging control circuit (20);
Described battery pack (30) comprises at least two batteries be connected in series;
Described charge management circuit (10) is connected with described charging control circuit (20); Described battery pack (30) is connected with described charging control circuit (20);
Described charge management circuit (10) is for realizing the constant voltage constant current charging of described battery;
Described charging control circuit (20) for detecting the voltage of battery in described battery pack (30), and carries out alternately charging, until each battery is all full of electricity based on testing result to each battery.
2. balance-type charger according to claim 1, it is characterized in that, described charging control circuit (20) comprises the detection comparison circuit and multiple switching circuit be connected with each battery respectively that are connected with described charge management circuit (10) and battery pack (30) respectively;
Described detection comparison circuit is used for the cell voltage detected to compare between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
3. balance-type charger according to claim 1, it is characterized in that, described charging control circuit (20) comprises the detection comparison circuit and multiple switching circuit be connected with each battery respectively that are connected with described charge management circuit (10) and battery pack (30) respectively;
Described detection comparison circuit is used for the voltage detected to compare, and sort according to voltage levels according to the voltage of comparative result by each battery, and select the corresponding switching circuit of conducting with from the minimum battery of voltage successively charging, the voltage difference of each battery and the highest battery of voltage is made to be preset difference value, then the voltage of each battery is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
4. the balance-type charger according to any one of Claims 2 or 3, is characterized in that, described balance-type charger also comprises: charge-discharge protection circuit (40);
Described charge-discharge protection circuit (40) is connected with described battery pack (30) and charging control circuit (20) respectively;
Described charge-discharge protection circuit (40) is for detecting cell voltage in charging process to carry out over-charge protective, and the electric current detected in battery discharge procedure and cell voltage are to carry out overcurrent and Cross prevention; Whether described charge-discharge protection circuit (40) also connects instead for detecting battery, if connect anti-, disconnects charging path or discharge path.
5. balance-type charger according to claim 4, it is characterized in that, described charge-discharge protection circuit (40) comprising: reverse-connection preventing circuit (41), overcharge protection circuit (42), mistake are put and current foldback circuit (43);
Wherein, reverse-connection preventing circuit (41) is connected with described battery pack (30); Overcharge protection circuit (42) is respectively with described battery pack (30) and detect comparison circuit (25) and be connected; Cross and to put and current foldback circuit (43) is connected with described battery pack (30).
6. balance-type charger according to claim 5, is characterized in that, described battery pack (30) comprising: the first battery (31) be connected in series and the second battery (32);
Described charging control circuit (20) comprising: the first switching circuit (21), second switch circuit (22), the 3rd switching circuit (23), the 4th switching circuit (24) and detection comparison circuit (25);
Described charge management circuit (10) is connected with described detection comparison circuit (25); Described first switching circuit (21) is connected with described detection comparison circuit (25) and described first battery (31) respectively; Described second switch circuit (22) is connected with described detection comparison circuit (25) and described first battery (31) respectively; Described 3rd switching circuit (23) is connected with described detection comparison circuit (25) and described second battery (32) respectively; Described 4th switching circuit (24) is connected with described detection comparison circuit (25) and the second battery (32) respectively;
Described detection comparison circuit (25) is connected with described first battery (31) and the second battery (32) respectively;
Described detection comparison circuit (25) for detecting and the voltage of more described first battery (31) and the second battery (32), and selects the first switching circuit (21) described in conducting and second switch circuit (22) with to described first battery (31) charging or select the 3rd switching circuit (23) described in conducting and the 4th switching circuit (24) to charge to described second battery (32).
7. balance-type charger according to claim 6, is characterized in that, described charge management circuit (10) comprising: charging chip (IC1); The model of described charging chip (IC1) is CX4056;
Described detection comparison circuit (25) comprising: operational amplifier (IC2), sampling resistor R6, sampling resistor R7, sampling resistor R8, resistance R5, electric capacity C3, electric capacity C4, triode Q1 and triode Q2;
Described first switching circuit (21) comprising: field effect transistor Q6;
Described second switch circuit (22) comprising: field effect transistor Q5;
Described 3rd switching circuit (23) comprising: field effect transistor Q3 and field effect transistor Q9;
Described 4th switching circuit (24) comprising: field effect transistor Q4;
4th pin of charging chip (IC1) is connected with external charging power supply with the 3rd pin; 5th pin of charging chip (IC1) is connected with the drain electrode of field effect transistor Q6;
The in-phase input end of operational amplifier (IC2) is connected with one end of electric capacity C4 through resistance R5, and the other end of electric capacity C4 is connected with the inverting input of operational amplifier (IC2) through resistance R4; The in-phase input end of operational amplifier (IC2) is connected with one end of electric capacity C4 through electric capacity C3; The output of operational amplifier (IC2) is connected with the base stage of triode Q1, and the output of operational amplifier (IC2) is connected with the base stage of triode Q2; The collector electrode of triode Q1 is connected with the grid of field effect transistor Q4; The source ground of field effect transistor Q4; The drain electrode of field effect transistor Q4 is connected with the drain electrode of field effect transistor Q5, the grounded-grid of field effect transistor Q5, and is connected with the collector electrode of triode Q2 and the grid of field effect transistor Q6 respectively; The grid of field effect transistor Q5 is connected with the source electrode of field effect transistor Q6; The source electrode of field effect transistor Q5 is connected with the negative pole of the second battery (32); The drain electrode of field effect transistor Q5 is connected with the 5th pin of charging chip (IC1) through electric capacity C2;
The source electrode of field effect transistor Q3 is connected with the source electrode of the source electrode of field effect transistor Q7 and field effect transistor Q9; The drain electrode of field effect transistor Q3 is connected with the drain electrode of field effect transistor Q6; The grid of field effect transistor Q3 is connected with the positive power source terminal of operational amplifier (IC2) through resistance R16;
The emitter of triode Q2 is connected with the positive power source terminal of operational amplifier (IC2); The base stage of triode Q2 is connected with the positive power source terminal of operational amplifier (IC2); One end of sampling resistor R6 is connected with the positive power source terminal of operational amplifier (IC2), and the other end is through sampling resistor R7 ground connection;
The inverting input of operational amplifier (IC2) is connected with the node between sampling resistor R6 and sampling resistor R7;
The base stage of triode Q1 is connected with the 5th pin of charging chip (IC1);
The grid of field effect transistor Q4 is connected with the grid of field effect transistor Q3;
The source electrode of field effect transistor Q6 is connected with the positive pole of the second battery (32);
The source electrode of field effect transistor Q9 is connected with the source electrode of field effect transistor Q3, and the drain electrode of field effect transistor Q9 is connected with the positive pole of the first battery (31); The grounded-grid of field effect transistor Q9; The minus earth of the first battery (31).
8. balance-type charger according to claim 7, is characterized in that, described reverse-connection preventing circuit (41) comprising: field effect transistor Q7, triode Q8 and field effect transistor Q9;
The drain electrode of field effect transistor Q7 is connected with the negative pole of the second battery (12); The source electrode of field effect transistor Q7 is connected with the source electrode of field effect transistor Q9; The grid of field effect transistor Q7 is connected with the collector electrode of triode Q8; The grid of field effect transistor Q9 is connected with the collector electrode of triode Q8; The base stage of triode Q8 is connected with the negative pole of the first battery (11) through resistance R20, and the emitter of triode Q8 is connected with the drain electrode of field effect transistor Q9, and the collector electrode of triode Q8 is through resistance R20 ground connection.
9. a balance-type charging method, is characterized in that, comprising:
The voltage of S1, detection battery;
S2, based on testing result, alternately charging is carried out, until each battery is all full of electricity to each battery.
10. balance-type charging method according to claim 9, is characterized in that, described step S2 specifically comprises:
The cell voltage detected is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity;
Or
Described step S2 specifically comprises:
The voltage detected is compared, and sort according to voltage levels according to the voltage of comparative result by each battery, and select the corresponding switching circuit of conducting with from the minimum battery of voltage successively charging, the voltage difference of each battery and the highest battery of voltage is made to be preset difference value, then the voltage of each battery is compared between two, and according to comparative result, the battery selecting the corresponding switching circuit of conducting to think that voltage is lower charges and charge capacity is preset charged threshold value, if when both voltage is equal, the corresponding switching circuit of conducting is then selected to think that any battery is charged and charge capacity is preset charged threshold value, until each battery is all full of electricity.
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Effective date of registration: 20200401 Address after: 516025 west of the second floor of building a, No. 13, JINDA Road, Huinan hi tech Industrial Park, huiao Avenue, Huizhou City, Guangdong Province Patentee after: LLAB HUIZHOU Corp. Address before: 518000 Guangdong province Shenzhen city Futian District road Binhe love to building apartment buildings 22E Patentee before: SHENZHEN AILANBO POWER ELECTRONICS Co.,Ltd. |