CN201000907Y - Secondary battery having battery unit voltage balance device - Google Patents
Secondary battery having battery unit voltage balance device Download PDFInfo
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- CN201000907Y CN201000907Y CNU2007201184065U CN200720118406U CN201000907Y CN 201000907 Y CN201000907 Y CN 201000907Y CN U2007201184065 U CNU2007201184065 U CN U2007201184065U CN 200720118406 U CN200720118406 U CN 200720118406U CN 201000907 Y CN201000907 Y CN 201000907Y
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- battery pack
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The technical problem for the utility model to solve is to provide a device which can keep the voltage among each battery unit of the battery group as the same. The utility model provides a battery voltage balancing device of a secondary battery with battery unit, which comprises a battery casing (1), a battery group (2), a charging circuit, a releasing circuit and a security protection device (3). The battery group (2) is arranged in the battery casing (1), and formed by a plurality of series-wounded battery unit (21), and the charging circuit, the releasing circuit and the security protection device (3) are connected with the battery group (2). The utility model is characterized in that the security protection device (3) comprises a battery voltage balancing device (4) which is connected with the battery unit (21), for adjusting the voltage of the battery unit (21) and making the voltage of each battery unit is closed to each other. Comparing with the existing art, the utility model has the advantages that the voltage among each battery unit of the secondary battery can be kept the same, the circuit is relatively simple, the cost is lower, and the reliability is higher.
Description
Technical field
The utility model relates to a kind of secondary cell, relates in particular to a kind of secondary cell with battery cell voltage bascule.
Background technology
In order to solve the problem of environmental pollution that electrokinetic cell uses lead-acid battery to cause, many producers have adopted lithium-ion-power cell, lithium-ion-power cell forms by multiple batteries unit serial connection, because there is difference in each battery unit character, repeatedly after the charge and discharge cycles, the voltage difference of each batteries unit can strengthen gradually, and this difference gently then shortens the useful life of battery pack, and is heavy then produce explosion hazard.
The protection scheme of lithium-ion-power cell generally adopts single-chip microcomputer or single-unit electricity core protection chip to detect voltage, electric current and the temperature of battery, carries out the safeguard protection of battery.But there are some defectives in the mode of these safeguard protections, and complex circuit and reliability are low, and quiescent current ambassador electrokinetic cell should not be placed for a long time, and a defencive function lost efficacy, and easily generation is dangerous in the back.Use the single-chip microcomputer scheme to protect electrokinetic cell also very immature at present, still need complicated periphery circuit.
Be called " chargeable cell monitoring and balancing circuitry " as Chinese patent application CN200420065712.3 name and disclose the circuit of the balance of voltage between a kind of every batteries unit that can make series connection.Accurately monitoring comprises an analog/digital converter (ADC) and a processor from the supervisory circuit of each cell voltage in a plurality of batteries of battery pack.ADC receives from the analog voltage signal of each battery in a plurality of batteries and each analog voltage signal is converted to the digital voltage signal of accurate each cell voltage of representative.Processor receives this digital signal and provides a safety alarm signal according at least one signal wherein.The resolution of ADC is adjustable.If at least wherein the voltage difference of two batteries of two digital signal indicatings is greater than the battery equilibrium thresholding, balancing circuitry then provides a balanced signal.And the utility model provides the electronic equipment that comprises this supervisory circuit and balancing circuitry.But this circuit uses single-chip microcomputer, the peripheral circuit more complicated, and circuit cost is higher, and reliability is lower.
The utility model content
The technical problems to be solved in the utility model provides and a kind ofly can make the device that the voltage between every batteries unit is consistent in the secondary battery, and this device should cost is cheap, the reliability height.
In order to solve above technical problem, the utility model provides:
A kind of secondary cell with battery cell voltage bascule; comprise: battery case, be arranged on battery pack and the charge circuit that is connected with this battery pack, discharge loop and safety guard that the battery unit that is connected in series mutually by more piece in the battery case is formed, described safety guard comprises the battery cell voltage bascule that the voltage that is connected in described battery unit, is used to regulate this battery cell voltage and make each battery unit is close.
Each battery unit of described battery pack all respectively connects a battery cell voltage bascule; Described battery cell voltage bascule comprises: gate-controlled switch, resistance and comparator; Described gate-controlled switch and described battery unit and a resistance compose in series the loop, and the output of described comparator connects the control end of described gate-controlled switch.
Described gate-controlled switch is a normally open, when described gate-controlled switch control end is sent into high level, and described gate-controlled switch closure.
Described gate-controlled switch adopts metal-oxide-semiconductor, the G utmost point that described gate-controlled switch control end is described metal-oxide-semiconductor, and the both positive and negative polarity of the S utmost point of described metal-oxide-semiconductor and the D utmost point and described resistance and described battery unit is serially connected in the loop successively.
The end of just comparing of described comparator links to each other with the positive pole of described battery unit; The negative sense of described comparator is relatively held with the average voltage level of all battery units of described battery pack and is connected.
Described battery pack is coupled together by N batteries units in series, then identical with N resistance and be connected to independent loop greater than the resistance series connection of 100M ohm described battery pack, promptly can on single described resistance, obtain the average voltage level of all battery units of described battery pack.
It is the integrated circuit (IC) chip of LM324 that described comparator adopts model.
By above technological means, the utility model can be in described battery pack in the overtension of certain batteries unit, give this battery unit discharge, make the voltage of this battery unit reduce, when the voltage of this battery drops to the average voltage level of battery unit of described battery pack, then stop discharge.The voltage of battery unit that so just can realize described battery pack is basic identical.Simultaneously, the battery cell voltage bascule can also adopt following scheme:
Each battery unit of described battery pack all respectively connects a battery cell voltage bascule; Described battery cell voltage bascule comprises: gate-controlled switch, resistance and be used for the integrated circuit of electric core monitoring, described gate-controlled switch and described battery unit and a resistance compose in series the loop, and the output of described integrated circuit (49) connects the control end of described gate-controlled switch; Described integrated circuit adopts S8241.
Described charge circuit comprises with lower part series connection formation: charging port, controlled fuse, battery pack, Thermal Cutoffs and charge switch;
Described discharge loop comprises with lower part series connection formation: discharge output port, switch lock, electric current fuse, battery pack, Thermal Cutoffs, resistance and discharge switch;
Serial connection charge switch in the described batteries charging loop, discharged in series switch in the described battery power discharge loop; Described charge switch adopts metal-oxide-semiconductor IRF5305;
Described discharge switch adopts metal-oxide-semiconductor IRF3205;
In order to ensure described battery pack safe handling, described safety guard also comprises:
Temperature protective device comprises: device for detecting temperature is connected with temperature switch with negative temperature coefficient resister in the gap that is placed on described battery pack, and controls described charge switch and discharge switch; And Thermal Cutoffs, be connected in the described discharge loop;
Adopt the electric current and voltage supervising device of more piece electricity core protection chip, the input of described more piece electricity core protection chip connects the both positive and negative polarity of every batteries unit in the described battery pack and the two ends that series connection inserts the resistance of described discharge loop, the output control discharge switch of described more piece electricity core protection chip, output control charge switch;
Adopt the secondary voltage protective device of more piece electricity core protection chip; the input of described more piece electricity core protection chip connects every batteries unit in the battery pack; described more piece electricity core protection chip output is controlled controlled fuse, and described more piece electricity core protection chip 20 adopts S8244.
Compare with prior art, the utility model has realized that the voltage between every batteries unit is consistent in the secondary battery, and circuit is simple relatively, and cost is lower, and reliability is higher.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is an electrical block diagram of the present utility model;
Fig. 3 is the operating circuit schematic diagram of battery cell voltage bascule of the present utility model;
Fig. 4 is the operating circuit schematic diagram of temperature protective device of the present utility model;
Fig. 5 is the operating circuit schematic diagram of electric current and voltage supervising device of the present utility model;
Fig. 6 is the operating circuit schematic diagram of secondary voltage protective device of the present utility model;
Fig. 7 is the circuit diagram of device for monitoring temperature of the present utility model;
Fig. 8 is the operating circuit schematic diagram of battery cell voltage bascule of the present utility model.
Embodiment
A kind of as shown in Figure 1 secondary cell comprises: battery case 1, battery pack 2 and the safety guard 3 that is connected with described battery pack 2 by connection line 8.Described battery pack 2 is connected in series by multiple batteries unit 21 and forms.By described safety guard 3, can ensure that described battery pack 2 electric current, voltage and temperature in charge and discharge process are controlled in the certain limit, and can guarantee that the voltage between the battery unit in the described battery pack 2 is in more than the identical level.
This secondary cell also comprises: dump energy indicating circuit 17, discharge output port 18, charging input end mouth 19 and switch lock 16.Can indicate the electric weight of described battery pack by described dump energy knowledge circuit 17.Described switch lock 16 is connected in the discharge loop of described battery pack 2, can disconnect or connect described charging and discharging circuit by described switch lock 16.
Secondary cell circuit as shown in Figure 2.Battery pack 2 has two loops: by the discharge loop of discharge port 18 and the charge circuit by charging port 19.Charge circuit comprises with lower part series connection formation: charging port 19, controlled fuse 14, battery pack 2, Thermal Cutoffs 78, first charge switch 91 and second charge switch 92.Discharge loop comprises with lower part series connection formation: discharge output port 18, switch lock 16, electric current fuse 15, battery pack 2, Thermal Cutoffs 78, resistance 13 and discharge switch 10.
Excessive when the discharging current of described discharge loop, when surpassing the fusing value of described electric current fuse 15, described electric current fuse 15 fuses, and described discharge loop opens circuit.
Described first charge switch 91 and second charge switch 92 and discharge switch 10 are gate-controlled switch, and its state is normally closed, and when control end was sent into signal, then switch disconnected.
Described controlled fuse 14 states are normally closed, fusing immediately after its control end is received the fusing signal, and this fusing is irrecoverable.
The safety guard 3 that is connected with described battery pack 2 by connection line comprises battery cell voltage bascule 4, electric current and voltage supervising device 5, secondary voltage protective device 6 and temperature protective device.
Described battery cell voltage bascule 4 is connected with described battery pack 2 and wherein every batteries unit item by circuit.
Described temperature protective device comprises device for monitoring temperature 7 and Thermal Cutoffs 78, and the output of device for detecting temperature 7 connects the control end of described first charge switch 91 and second charge switch 92 and the control end of discharge switch 10 respectively.
The resistance 13 of connecting in the electric core of the input of described electric current and voltage supervising device 5 and battery pack 2 and the discharge loop of described battery pack 2 is connected, and output connects the control end of second charge switch 92 and the control end of discharge switch 10 by lead.By monitoring the voltage on the described resistance 13, this voltage linear is proportional to the electric current of discharge loop.Described electric current and voltage supervising device 5 can obtain the discharging current of described discharge loop.Described electric current and voltage supervising device 5 can be sent control signal to the control end of described second charge switch 92 or the control end of discharge switch 10, cuts off described charge circuit or discharge loop.
The input of secondary voltage protective device 6 links to each other with described battery pack 2 the two poles of the earth, monitors the voltage of described battery pack 2, and output links to each other with the control end of described controlled fuse 14 by guiding.
As shown in Figure 3, be a kind of implementation of the utility model cell balancing circuit.Described battery pack 2 is connected in series by several battery units 21 and forms.Described battery unit 21 and described battery cell voltage bascule 4 are connected in parallel.Described battery unit 21 and resistance 44 and gate-controlled switch 43 are connected in series and are the loop, and the control end of described gate-controlled switch 43 is connected with the output of comparator 42.The end of just comparing of described comparator 42 links to each other with the positive pole of described battery unit 21, is the voltage of described battery unit 21; The negative sense of described comparator is relatively held with the average voltage level of all battery units of described battery pack 2 and is connected.
Described gate-controlled switch 43 is open circuit when being low level at its control end.When the voltage of described battery unit 21 is higher than the average voltage of all battery units of battery pack 2, the output of described comparator 42 sends high level for the control of gate-controlled switch 43, described gate-controlled switch 43 is connected, then described battery unit 21 discharges by described resistance 44, equals up to battery unit 21 voltages till the average voltage level of all battery units of described battery pack 2.
Described gate-controlled switch 43 can adopt metal-oxide-semiconductor, and described gate-controlled switch 43 control ends are the G utmost point of this metal-oxide-semiconductor.Described comparator 42 can adopt operational amplifier integrated circuit LM324.
The average voltage level of all battery units of described battery pack 2 can obtain in the following manner.Described battery pack 2 is connected in series by N batteries unit 21, then can be identical with N resistance and be connected to independent loop greater than the resistance series connection of 100M ohm in described battery pack 2, then can on this single resistance, obtain the average voltage level of all battery units of described battery pack 2.
As shown in Figure 8, be another implementation of the utility model cell balancing circuit.Compare with mode shown in Figure 3, the integrated circuit 49 that is used for electric core monitoring that this mode adopts, this integrated circuit 49 adopts S8241.When the voltage of described battery unit is higher than a fixed voltage value, in the time of promptly earlier default average voltage level, these integrated circuit 49 output voltages are to described gate-controlled switch 43, make described gate-controlled switch 43 conductings, and this battery unit 21 discharges by described resistance 44.
Described average voltage level can be got 4.2 volts.
As shown in Figure 4, a kind of temperature protective device is connected in battery pack 2 charge circuits and the discharge loop, comprises device for detecting temperature 7 and Thermal Cutoffs 78.
Described device for detecting temperature 7 is connected with temperature switch 71 with negative temperature coefficient resister 72 in the gap that is placed on described battery pack 2, and controls described first charge switch 91 and second charge switch 92 and discharge switch 10.
The signal of described negative temperature coefficient resister 72 change in resistance is imported operational amplifier in the described device for detecting temperature 7 by lead, and the output of this operational amplifier connects described first charge switch 91 and second charge switch, 92 control ends by lead.Described operational amplifier adopts LM358.
Described first charge switch 91 and second charge switch 92 adopt metal-oxide-semiconductor IR48, and described discharge switch 10 adopts metal-oxide-semiconductor IRF5305.
When the temperature of described negative temperature coefficient resister 72 is lower than 0 degree centigrade or when being higher than 50 degrees centigrade, described operational amplifier is sent level signal and cut off described first charge switch 91, stops the charging of described battery pack 2.
Described temperature switch 71 is a temperature memory alloy switch, and the actuating signal of described temperature switch 71 is sent into described device for detecting temperature 7.When the temperature of described battery pack 2 surpasses certain value A, the action of described temperature switch 71, this actuating signal is by described device for detecting temperature 7 described charge switch 92 of control and discharge switches 10.After the temperature in the described battery pack 2 returned to certain limit, described charge switch 92 and discharge switch 10 recovered closed.Described A value is greater than 50 degrees centigrade.
When the temperature of described battery pack 2 rises when reaching a certain temperature value B then described Thermal Cutoffs 78 fusing, the charge circuit and the discharge loop that cut off described battery pack 2.Described B value is higher than described A value.
The fusing of described Thermal Cutoffs 78 is expendable.
As shown in Figure 7, the voltage of negative temperature coefficient resister 72 will change with variation of temperature, use bridge circuit as figure can detect as described in the change in voltage of negative temperature coefficient resister 72 just can detect the variation of temperature amount.The voltage of negative temperature coefficient resister 72 connects the negative input of operational amplifier 76 and the positive input of operational amplifier 77.The positive input of the voltage input operational amplifier 76 of resistance 74, the negative input of the voltage input operational amplifier 77 of resistance 75, the voltage with temperature coefficient of resistance 72 compares respectively.The output of operational amplifier 76 outputs and operational amplifier 77 is by the closed and disconnected of voltage transitions 79 controls first charge switch 91.
Described voltage transitions 79 can be according to the difference of the voltage of importing, output height or low level, and in the present embodiment, high level turn off charge switch (91), low level make charge switch (91) closure.
Described negative temperature coefficient resister 72 is in 0 to 50 degree centigrade of scope the time, and voltage is higher than institute's component voltage on the described resistance 75 on the described negative temperature coefficient resister 72, also is lower than institute's component voltage on the described resistance 74.At this moment, 77 outputs of described operational amplifier 76 and operational amplifier are sent to the control end of described charge switch 91 by this level signal by described voltage transitions 79, and charge circuit is communicated with.
When the temperature of described negative temperature coefficient resister 72 is lower than certain certain value, voltage on the described negative temperature coefficient resister 72 is higher than voltage on the described resistance 74, described operational amplifier 76 output low level signals, then described voltage transitions 79 output high level, cut off described charge switch 91, the charge circuit open circuit.When the temperature of described temperature coefficient of resistance 72 surpasses certain certain value, voltage on the described negative temperature coefficient resister 72 is lower than voltage on the described resistance 75, described operational amplifier 77 output low level signals, this level signal is cut off described charge switch 91 by described voltage transitions 79, the charge circuit open circuit.
As shown in Figure 5, described electric current and voltage supervising device 5 adopts more piece electricity core protection chip 12.
The both positive and negative polarity of every batteries unit all is connected respectively to the input of described more piece electricity core protection chip 12 in the described battery pack 2 by lead; the series connection of battery pack 2 discharge loops inserts resistance 13; described resistance 13 two ends are wired to the input of more piece electricity core protection chip 12, in order to detect battery pack 2 discharge loop electric currents.
The output 122 control discharge switches 10 of more piece electricity core protection chip 12, output 121 controls second charge switch 92 of described more piece electricity core protection chip 12.
Any batteries cell voltage surpasses certain limit in the described battery pack 2 when described more piece electricity core protection chip 12 detects, and then this chip output 121 is sent level signal, cuts off described second charge switch 92, thereby cuts off charge circuit.
Described more piece electricity core protection chip 12 adopts S8254.
As shown in Figure 6, described secondary voltage protective device 6 adopts more piece electricity core protection chip 20.Described charging port 19 and 14 series connection of controlled fuse connect battery pack 2, and the input of more piece electricity core protection chip 20 is used to detect the voltage of every batteries unit by every batteries unit in the wire connected battery group 2.Described more piece electricity core protection chip 20 adopts S8244.
The voltage that detects any batteries unit in the described battery pack 2 when described more piece electricity core protection chip 20 surpasses certain numerical value; be that electric current and voltage supervising device 5 lost efficacy; in the time of the overtension of battery unit; described more piece electricity core protection chip 20 outputs send the fusing signal for controlled fuse 14 by lead, then controlled fuse 14 fusing.14 fusing of electric current fuse are irrecoverable.
Claims (10)
1, a kind of secondary cell with battery cell voltage bascule; comprise: battery case (1), be arranged on battery pack (2) that the battery unit (21) that is connected in series mutually by more piece in the battery case (1) formed and charge circuit, discharge loop and the safety guard (3) that is connected with this battery pack (2), it is characterized in that: described safety guard (3) comprises the battery cell voltage bascule (4) that the voltage that is connected in described battery unit (21), is used to regulate this battery unit (21) voltage and make each battery unit is close.
2, secondary cell according to claim 1 is characterized in that, each battery unit (21) of described battery pack (2) all respectively connects a battery cell voltage bascule (4); Described battery cell voltage bascule (4) comprising: a gate-controlled switch (43), a resistance (44) and comparator (42); Described gate-controlled switch (43) and described battery unit (21) and a resistance (44) compose in series the loop, and the output of described comparator (42) connects the control end of described gate-controlled switch (43).
3, secondary cell according to claim 2 is characterized in that, described gate-controlled switch (43) is a normally open, when described gate-controlled switch (43) control end is sent into high level, and described gate-controlled switch (43) closure.
4, according to claim 2 or 3 described secondary cells, it is characterized in that, described gate-controlled switch (43) adopts metal-oxide-semiconductor, described gate-controlled switch (43) control end is the G utmost point of described metal-oxide-semiconductor, and the both positive and negative polarity of the S utmost point of described metal-oxide-semiconductor and the D utmost point and described resistance (44) and described battery unit (21) is serially connected in the loop successively.
5, secondary cell according to claim 2 is characterized in that, the end of just comparing of described comparator (42) links to each other with the positive pole of described battery unit (21); The negative sense of described comparator (42) is relatively held with the average voltage level of all battery units of described battery pack (2) and is connected.
6, secondary cell according to claim 5, it is characterized in that, described battery pack (2) is connected in series by N batteries unit (21), then identical with N resistance and be connected to independent loop greater than the resistance series connection of 100M ohm described battery pack (2), promptly can on single described resistance, obtain the average voltage level of all battery units of described battery pack (2).
According to claim 2 or 5 described secondary cells, it is characterized in that 7, it is the integrated circuit (IC) chip of LM324 that described comparator (42) adopts model.
8, secondary cell according to claim 1 is characterized in that, each battery unit (21) of described battery pack (2) all respectively connects a battery cell voltage bascule (4); Described battery cell voltage bascule (4) comprising: gate-controlled switch (43), resistance (44) and be used for the integrated circuit (49) of electric core monitoring, described gate-controlled switch (43) and described battery unit (21) and a resistance (44) compose in series the loop, and the output of described integrated circuit (49) connects the control end of described gate-controlled switch (43); Described integrated circuit (49) adopts S8241.
9, secondary cell according to claim 1, it is characterized in that described charge circuit comprises with lower part series connection formation: charging port (19), controlled fuse (14), battery pack (2), Thermal Cutoffs (78) and first charge switch (91) and second charge switch (92);
Described discharge loop comprises with lower part series connection formation: discharge output port (18), switch lock (16), electric current fuse (15), battery pack (2), Thermal Cutoffs (78), resistance (13) and discharge switch (10);
Series connection first charge switch (91) and second charge switch (92) in described battery pack (2) charge circuit, discharged in series switch (10) in described battery pack (2) discharge loop;
Described first charge switch (91) and second charge switch (92) are gate-controlled switch, adopt metal-oxide-semiconductor IRF5305;
Described discharge switch (10) is a gate-controlled switch, adopts metal-oxide-semiconductor IRF3205.
10, secondary cell according to claim 1 is characterized in that described safety guard (3) also comprises:
Temperature protective device, comprise: device for detecting temperature (7), be connected with temperature switch (71) with the negative temperature coefficient resister (72) in the gap that is placed on described battery pack (2), and control described first charge switch (91) and second charge switch (92) and discharge switch (10); And Thermal Cutoffs (78), be connected in the described discharge loop;
Adopt the electric current and voltage supervising device (5) of more piece electricity core protection chip (12), the input of described more piece electricity core protection chip (12) connects the both positive and negative polarity of every batteries unit in the described battery pack (2) and the two ends that series connection inserts the resistance (13) of described discharge loop, output (122) the control discharge switch (10) of described more piece electricity core protection chip (12), output (121) control second charge switch (92);
Adopt the secondary voltage protective device (6) of more piece electricity core protection chip (20); the input of described more piece electricity core protection chip (20) connects every batteries unit in the battery pack (2); described more piece electricity core protection chip (20) output is controlled controlled fuse (14), and described more piece electricity core protection chip (20) adopts S8244.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201184065U CN201000907Y (en) | 2007-01-30 | 2007-01-30 | Secondary battery having battery unit voltage balance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201184065U CN201000907Y (en) | 2007-01-30 | 2007-01-30 | Secondary battery having battery unit voltage balance device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201000907Y true CN201000907Y (en) | 2008-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201184065U Expired - Lifetime CN201000907Y (en) | 2007-01-30 | 2007-01-30 | Secondary battery having battery unit voltage balance device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201000907Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752624A (en) * | 2010-01-13 | 2010-06-23 | 深圳市京泉华电子有限公司 | A kind of equalizing charge of battery method and device |
-
2007
- 2007-01-30 CN CNU2007201184065U patent/CN201000907Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752624A (en) * | 2010-01-13 | 2010-06-23 | 深圳市京泉华电子有限公司 | A kind of equalizing charge of battery method and device |
| CN101752624B (en) * | 2010-01-13 | 2014-06-11 | 深圳市京泉华科技股份有限公司 | Equalizing charge method and equalizing charge device for battery |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080102 |