CN202798079U - Charging/discharging protection circuit of lithium battery - Google Patents
Charging/discharging protection circuit of lithium battery Download PDFInfo
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- CN202798079U CN202798079U CN 201220470394 CN201220470394U CN202798079U CN 202798079 U CN202798079 U CN 202798079U CN 201220470394 CN201220470394 CN 201220470394 CN 201220470394 U CN201220470394 U CN 201220470394U CN 202798079 U CN202798079 U CN 202798079U
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Abstract
The utility model relates to a charging/discharging protection circuit of a lithium battery. The charging/discharging protection circuit comprises a charging/discharging controller (IC), a discharging control switch tube (Q1) and a charging control switch tube (Q2), wherein the charging/discharging controller (IC) is connected with an anode and a cathode of the lithium battery; a grid electrode of the discharging control switch tube (Q1) is connected with a discharging control output signal end (DO) of the charging/discharging controller (IC); a source electrode of the discharging control switch tube (Q1) is connected with the cathode of the lithium battery; a grid electrode of the charging control switch tube (Q2) is connected with a charging control output signal end (CO) of the charging/discharging controller (IC); a source electrode of the charging control switch tube (Q2) is connected with a cathode of a charger; and an anode of the charger is connected with the anode of the lithium battery; and the charging/discharging protection circuit is characterized by also comprising an oscillator, wherein an input end (IN) of the oscillator is connected with the discharging control output signal end of the charging/discharging controller, and an output end (OUT) of the oscillator is connected with the grid electrode of the charging control switch tube (Q2). The purpose of controlling the charging current size can be reached by regulating the duty ratio of the oscillator.
Description
Technical field
The utility model relates to a kind of charge-discharge protection circuit of lithium battery.
Background technology
Existing lithium battery charge and discharge protective circuit generally is comprised of a charging control switch pipe, a discharge control switch pipe and special-purpose charging-discharging controller, and the control circuit that charging-discharging controller can be comprised of separate piece also can be an integrated control chip.Generally, the connected mode of they and charger and load has following three kinds of situations:
The first situation: the grid of discharge control switch pipe Q1 links to each other with the control of discharge output signal end DO of charging-discharging controller IC, the grid of charging control switch pipe Q2 links to each other with the charging of charging-discharging controller IC control output signal end CO, the source electrode of discharge control switch pipe Q1 links to each other with the negative pole of lithium battery group, and the two ends of load are connected between the drain electrode and lithium battery group positive pole of discharge control switch pipe Q1; The drain electrode of charging control switch pipe Q2 links to each other with the negative pole of lithium battery group, the source electrode of charging control switch pipe Q2 links to each other with the negative pole of charger CDQ, the positive pole of charger CDQ links to each other with the positive pole of lithium battery group, charging-discharging controller IC monitors the voltage of lithium battery group and control of discharge output signal end DO and charging control output signal end CO is controlled, shown in accompanying drawing 8; Its circuit working principle is: when lithium battery is in charged state, charging control output signal end CO output high level, charging control switch pipe Q2 conducting, charger CDQ normally charges to the lithium battery group, when lithium battery voltage is full of, charging control output signal end CO output low level, charging control switch pipe Q2 cut-off, charge circuit disconnects, and charger CDQ stops the lithium battery group is charged; When lithium battery is under the discharge condition, control of discharge output signal end DO exports high level, discharge control switch pipe Q1 conducting, lithium battery is powered to load RL, when lithium battery pressure drop during to critical voltage (such as 2.55V), control of discharge output signal end DO output low level, discharge control switch pipe Q1 cut-off, the lithium battery group stops to power to load RL.
The second situation: different from the first situation is that the drain electrode of discharge control switch pipe Q1 is connected with the drain electrode of charging control switch pipe Q2; Shown in accompanying drawing 9; Its charging operation principle is: charging control output signal end CO output high level, charging control switch pipe Q2 conducting, when control of discharge output signal end DO output high level, discharge control switch pipe Q1 conducting, charger CDQ is normally to charging when the lithium battery group, when control of discharge output signal end DO output low level, discharge control switch pipe Q1 cut-off, because the diode D of discharge control switch pipe Q1 inside exists, charger CDQ still can normally charge to the lithium battery group, when lithium battery is full of, charging control output signal end CO output low level, charging control switch pipe Q2 cut-off, charge circuit disconnects, and charger CDQ stops the lithium battery group is charged; The discharge operation principle is identical with the first situation, that is: be under the discharge condition when lithium battery, control of discharge output signal end DO exports high level, discharge control switch pipe Q1 conducting, lithium battery is to load RL power supply, when lithium battery pressure drop during to critical voltage (such as 2.55V), and control of discharge output signal end DO output low level, discharge control switch pipe Q1 cut-off, the lithium battery group stops to power to load RL.
The third situation, different from the second situation is, the end of load RL links to each other with the source electrode of charging control switch pipe Q2, the other end of load RL links to each other with the lithium battery group is anodal, referring to shown in Figure 10, its charging work is identical with the charging operation principle of the second situation, its discharge operation principle is: when lithium battery is under the discharge condition, control of discharge output signal end DO exports high level, discharge control switch pipe Q1 conducting, charging control output signal end CO also exports high level, also conducting of charging control switch pipe Q2, and lithium battery is normally powered to load RL; When lithium battery pressure drop during to critical voltage (such as 2.55V), control of discharge output signal end DO output low level, discharge control switch pipe Q1 cut-off, the lithium battery group stops to power to load RL.
But, when lithium battery is lower than normal critical charging voltage through the voltage of often placing for a long time or running into other over-discharge situation and cause lithium battery, if carry out the conventional current charging according to above-mentioned charging circuit bio-occlusion lithium battery, can cause damage to the lithium battery interior structure like this, make easily the lithium battery group can't recover normal operation, thereby affect the life-span of lithium battery group, because according to above-mentioned charging circuit to lithium cell charging, because the voltage of lithium battery is very low, if this moment routinely electric current to lithium cell charging, this situation is very easily damaged the lithium battery interior structure, if and when lithium battery forces down in normal critical charging voltage, carry out little electric current (be the 1/10A of battery capacity such as charging current) charging to lithium battery, then fully can be with lithium cell charging to normal working voltage.
The utility model content
Technical problem to be solved in the utility model is the charge-discharge protection circuit that a kind of lithium battery is provided for above-mentioned prior art; when the voltage of can be in the lithium battery group any joint lithium battery of this charge-discharge protection circuit is lower than normal critical charging voltage the lithium battery group is carried out trickle charge, effectively protect the lithium battery group.
The utility model solves the problems of the technologies described above the technical scheme that adopts: the charge-discharge protection circuit of this lithium battery, comprise with the lithium battery group anodal, the charging-discharging controller that negative pole connects, the discharge control switch pipe, the charging control switch pipe, the grid of discharge control switch pipe links to each other with the control of discharge output signal end of charging-discharging controller, the source electrode of discharge control switch pipe links to each other with lithium battery group negative pole, the grid of charging control switch pipe links to each other with the charging of charging-discharging controller control output signal end, the source electrode of charging control switch pipe links to each other with the negative pole of charger, the positive pole of charger links to each other with the lithium battery group is anodal, it is characterized in that: also comprise an oscillator, the input of described oscillator links to each other with the control of discharge output signal end of charging-discharging controller, the output of described oscillator links to each other with the grid of charging control switch pipe, the output signal of this oscillator is controlled by the control of discharge output signal of charging-discharging controller output, when control of discharge output signal end output low level, described oscillator output oscillator signal, make the interval conducting of charging control switch pipe, thereby change charging current; When control of discharge output signal end output high level, described oscillator stops concussion, and non-output signal, charger routinely charging current charge to the lithium battery group.
The circuit of described oscillator can have various ways to realize, wherein the most basic technical scheme is, described oscillator comprises: the 3rd field effect transistor, the 4th field effect transistor, the 5th field effect transistor, the 6th field effect transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity and the second electric capacity, wherein, the grid of the 3rd field effect transistor links to each other with the control of discharge output signal end of charging-discharging controller as the input of described oscillator, the source electrode of the 3rd field effect transistor links to each other with the lithium battery group is anodal, the drain electrode of the 3rd field effect transistor links to each other with the first end of the 4th resistance, the second end of the 4th resistance links to each other with the drain electrode of the 5th field effect transistor, the source electrode of the 5th field effect transistor links to each other with the source electrode of charging control switch pipe, the grid of the 5th field effect transistor links to each other with the first end of the first electric capacity, the second end of the first electric capacity links to each other with the second end of the first resistance, the first resistance, the second resistance, the first end of the 3rd resistance all links to each other with the first end of the 4th resistance, the first end of the second electric capacity links to each other with the drain electrode of the 5th field effect transistor, the second end of the second electric capacity links to each other with the second end of the 3rd resistance, the second end of the second resistance links to each other with the grid of the 5th field effect transistor, the grid of the 4th field effect transistor links to each other with the second end of the second electric capacity, the drain electrode of the 4th field effect transistor links to each other with the second end of the first electric capacity, the source electrode of the 4th field effect transistor links to each other with the source electrode of the 5th field effect transistor, the grid of the 6th field effect transistor links to each other with the drain electrode of the 4th field effect transistor, the drain electrode of the 6th field effect transistor links to each other with the grid of charging control switch pipe as the output of described oscillator, and the source electrode of the 6th field effect transistor links to each other with the source electrode of the 5th field effect transistor.
Another kind of technical scheme is, described oscillator comprises: the 7th field effect transistor, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 3rd electric capacity and operational amplifier, wherein, the grid of the 7th field effect transistor links to each other with the control of discharge output signal end of charging-discharging controller as the input of described oscillator, the source electrode of the 7th field effect transistor links to each other with the lithium battery group is anodal, the drain electrode of the 7th field effect transistor links to each other with the first end of the 5th resistance, the second end of the 5th resistance links to each other with the in-phase input end of operational amplifier, the first end of the 6th resistance links to each other with the in-phase input end of operational amplifier, the second end of the 6th resistance links to each other with the output of operational amplifier, the first end of the 7th resistance links to each other with the in-phase input end of operational amplifier, the second end of the 7th resistance links to each other with the source electrode of charging control switch pipe, the first end of the 8th resistance links to each other with the inverting input of operational amplifier, the second end of the 8th resistance links to each other with the output of operational amplifier, the first end of the 3rd electric capacity links to each other with the inverting input of operational amplifier, the second end of the 3rd electric capacity links to each other with the source electrode of charging control switch pipe, and the output of operational amplifier links to each other with the grid of charging control switch pipe as the output of described oscillator.
Compared with prior art; the utility model has the advantage of: by between the grid of the control of discharge output signal end of charging-discharging controller and charging control switch pipe, connecting an oscillator; by regulating the duty ratio of oscillator; make oscillator be operated in suitable duty ratio; realization is carried out trickle charge to lithium battery, effectively protects lithium battery, and when the voltage of lithium battery is higher than normal critical voltage; oscillator stops concussion, and lithium battery is carried out the conventional current charging.
Description of drawings
Fig. 1 is the block diagram of the charge-discharge protection circuit of lithium battery among the utility model embodiment one;
Fig. 2 is the circuit theory diagrams of the charge-discharge protection circuit of lithium battery among the utility model embodiment one;
Fig. 3 is the circuit theory diagrams of the charge-discharge protection circuit of lithium battery among the utility model embodiment two;
Fig. 4 is the block diagram of the charge-discharge protection circuit of lithium battery among the utility model embodiment three;
Fig. 5 is the circuit theory diagrams of the charge-discharge protection circuit of lithium battery among the utility model embodiment four;
Fig. 6 is the block diagram of the charge-discharge protection circuit of lithium battery among the utility model embodiment five;
Fig. 7 is the circuit theory diagrams of the charge-discharge protection circuit of lithium battery among the utility model embodiment six;
Fig. 8 is the circuit theory diagrams of charging and discharging lithium battery circuit in the first situation in the prior art;
Fig. 9 is the circuit theory diagrams of charging and discharging lithium battery circuit in the second situation in the prior art;
Figure 10 is the circuit theory diagrams of charging and discharging lithium battery circuit in the third situation in the prior art.
Embodiment
Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.
Embodiment one
The charge protector of lithium battery as shown in Figure 1; it comprises the lithium battery group of multisection lithium battery BT1 ~ BTn series connection; anodal with the lithium battery group; the charging-discharging controller IC that lithium battery group negative pole connects; discharge control switch pipe Q1; charging control switch pipe Q2 and oscillator; wherein; the grid of discharge control switch pipe Q1 links to each other with the control of discharge output signal end DO of charging-discharging controller IC; the source electrode of discharge control switch pipe Q1 links to each other with lithium battery group negative pole; the drain electrode of discharge control switch pipe Q1 links to each other with the drain electrode of charging control switch pipe Q2; the grid of charging control switch pipe Q2 links to each other with the charging of charging-discharging controller IC control output signal end CO; the source electrode of charging control switch pipe Q2 links to each other with the negative pole of charger CDQ; the positive pole of charger CDQ links to each other with the lithium battery group is anodal; the input IN of oscillator links to each other with the grid of discharge control switch pipe Q1; the output OUT of described oscillator links to each other with the grid of charging control switch pipe Q2, and the two ends of load RL are connected between the source electrode and lithium battery group positive pole of charging control switch pipe Q2.Charging-discharging controller can for the control circuit of separate piece composition, also can be an integrated control chip.
In the present embodiment, described oscillator comprises: the 3rd field effect transistor Q3, the 4th field effect transistor Q4, the 5th field effect transistor Q5, the 6th field effect transistor Q6, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first capacitor C 1 and the second capacitor C 2, see also shown in Figure 2, wherein, the grid of the 3rd field effect transistor Q3 links to each other with the control of discharge output signal end DO of charging-discharging controller IC as the input IN of described oscillator, the source electrode of the 3rd field effect transistor Q3 links to each other with the lithium battery group is anodal, the drain electrode of the 3rd field effect transistor Q3 links to each other with the first end of the 4th resistance (R4), the second end of the 4th resistance R 4 links to each other with the 5th field effect transistor Q5 drain electrode, the source electrode of the 5th field effect transistor Q5 links to each other with the source electrode of charging control switch pipe Q2, the grid of the 5th field effect transistor Q5 links to each other with the first end of the first capacitor C 1, the second end of the first capacitor C 1 links to each other with the second end of the first resistance R 1, the first resistance R 1, the second resistance R 2, the first end of the 3rd resistance R 3 all links to each other with the first end of the 4th resistance R 4, the first end of the second capacitor C 2 links to each other with the drain electrode of the 5th field effect transistor Q5, the second end of the second capacitor C 2 links to each other with the second end of the 3rd resistance R 3, the second end of the second resistance R 2 links to each other with the grid of the 5th field effect transistor (Q5), the grid of the 4th field effect transistor Q4 links to each other with the second end of the second capacitor C 2, the drain electrode of the 4th field effect transistor Q4 links to each other with the second end of the first capacitor C 1, the source electrode of the 4th field effect transistor Q4 links to each other with the source electrode of the 5th field effect transistor Q5, the grid of the 6th field effect transistor Q6 links to each other with the drain electrode of the 4th field effect transistor Q4, the drain electrode of the 6th field effect transistor Q6 links to each other with the grid of charging control switch pipe Q2 as the output OUT of described oscillator, and the source electrode of the 6th field effect transistor Q6 links to each other with the source electrode of the 5th field effect transistor Q5.
The operation principle of foregoing circuit is: when the voltage of each batteries in the lithium battery group all is in normal voltage, control of discharge output signal end DO exports high level, oscillator is not worked, non-output signal, and charger CDQ charges to the lithium battery group according to normal charging current in the circuit; The voltage of any joint lithium battery is lower than critical charging voltage in BT1 ~ BTn, control of discharge output signal end DO output low level, oscillator is started working, oscillator output end OUT exports oscillator signal, by adjusting the duty ratio of oscillator, just can control conducting and the deadline of charging control switch pipe Q2, thereby reach the purpose of control charging current.
Embodiment two
Different from embodiment one is, described oscillator comprises: the 7th field effect transistor Q7, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 3rd capacitor C 3 and operational amplifier CP, see also shown in Figure 3, wherein, the grid of the 7th field effect transistor Q7 links to each other with the control of discharge output signal end DO of charging-discharging controller IC as the input IN of described oscillator, the source electrode of the 7th field effect transistor Q7 links to each other with the lithium battery group is anodal, the drain electrode of the 7th field effect transistor Q7 links to each other with the first end of the 5th resistance R 5, the second end of the 5th resistance R 5 links to each other with the in-phase input end of operational amplifier CP, the first end of the 6th resistance R 6 links to each other with the in-phase input end of operational amplifier CP, the second end of the 6th resistance R 6 links to each other with the output of operational amplifier CP, the first end of the 7th resistance R 7 links to each other with the in-phase input end of operational amplifier CP, the second end of the 7th resistance R 7 links to each other with the source electrode of charging control switch pipe Q2, the first end of the 8th resistance R 8 links to each other with the inverting input of operational amplifier CP, the second end of the 8th resistance R 8 links to each other with the output of operational amplifier CP, the first end of the 3rd capacitor C 3 links to each other with the inverting input of operational amplifier CP, the second end of the 3rd capacitor C 3 links to each other with the source electrode of charging control switch pipe Q2, and the output of operational amplifier CP links to each other with the grid of charging control switch pipe Q2 as the output OUT of described oscillator.
The operation principle of foregoing circuit is identical with embodiment one.
Embodiment three
Different from embodiment one is that the two ends of load RL are connected between the drain electrode and lithium battery group positive pole of charging control switch pipe Q2, referring to shown in Figure 4.
The operation principle of foregoing circuit is identical with embodiment one.
Embodiment four
Different from embodiment two is that the two ends of load RL are connected between the drain electrode and lithium battery group positive pole of charging control switch pipe Q2, referring to shown in Figure 5.
The operation principle of foregoing circuit is identical with embodiment one.
Embodiment five
Different from embodiment one is, the drain electrode of charging control switch pipe Q2 links to each other with lithium battery group negative pole, and the two ends of load RL are connected between the drain electrode and lithium battery group positive pole of discharge control switch pipe Q1, referring to shown in Figure 6.
The operation principle of foregoing circuit is identical with embodiment one.
Embodiment six
Different from embodiment two is, the drain electrode of charging control switch pipe Q2 links to each other with lithium battery group negative pole, and the two ends of load RL are connected between the drain electrode and lithium battery group positive pole of discharge control switch pipe Q1, referring to shown in Figure 7.
The operation principle of foregoing circuit is identical with embodiment one.
Claims (3)
1. the charge-discharge protection circuit of a lithium battery, comprise with the lithium battery group anodal, the charging-discharging controller (IC) that lithium battery group negative pole connects, discharge control switch pipe (Q1), charging control switch pipe (Q2), the grid of discharge control switch pipe (Q1) links to each other with the control of discharge output signal end (DO) of charging-discharging controller (IC), the source electrode of discharge control switch pipe (Q1) links to each other with lithium battery group negative pole, the grid of charging control switch pipe (Q2) links to each other with the charging control output signal end (CO) of charging-discharging controller (IC), the source electrode of charging control switch pipe (Q2) links to each other with the negative pole of charger, the positive pole of charger links to each other with the lithium battery group is anodal, it is characterized in that: also comprise an oscillator, the input of described oscillator (IN) links to each other with the control of discharge output signal end (DO) of charging-discharging controller, the output of described oscillator (OUT) links to each other with the grid of charging control switch pipe (Q2), the output signal of this oscillator is controlled by the control of discharge output signal of charging-discharging controller output, when control of discharge output signal end output low level, described oscillator output oscillator signal, make charging control switch pipe (Q2) interval conducting, thereby change charging current; When control of discharge output signal end output high level, described oscillator stops concussion, and non-output signal, charger routinely charging current charge to the lithium battery group.
2. the charge-discharge protection circuit of lithium battery according to claim 1; it is characterized in that: described oscillator comprises: the 3rd field effect transistor (Q3); the 4th field effect transistor (Q4); the 5th field effect transistor (Q5); the 6th field effect transistor (Q6); the first resistance (R1); the second resistance (R2); the 3rd resistance (R3); the 4th resistance (R4); the first electric capacity (C1) and the second electric capacity (C2); wherein; the grid of the 3rd field effect transistor (Q3) links to each other with the control of discharge output signal end of charging-discharging controller as the input (IN) of described oscillator; the source electrode of the 3rd field effect transistor (Q3) links to each other with the lithium battery group is anodal; the drain electrode of the 3rd field effect transistor (Q3) links to each other with the first end of the 4th resistance (R4); the second end of the 4th resistance (R4) links to each other with the 5th field effect transistor (Q5) drain electrode; the source electrode of the 5th field effect transistor (Q5) links to each other with the source electrode of charging control switch pipe (Q2); the grid of the 5th field effect transistor (Q5) links to each other with the first end of the first electric capacity (C1); the second end of the first electric capacity (C1) links to each other with the second end of the first resistance (R1); the first resistance (R1); the second resistance (R2); the first end of the 3rd resistance (R3) all links to each other with the first end of the 4th resistance (R4); the first end of the second electric capacity (C2) links to each other with the drain electrode of the 5th field effect transistor (Q5); the second end of the second electric capacity (C2) links to each other with the second end of the 3rd resistance (R3); the second end of the second resistance (R2) links to each other with the grid of the 5th field effect transistor (Q5); the grid of the 4th field effect transistor (Q4) links to each other with the second end of the second electric capacity (C2); the drain electrode of the 4th field effect transistor (Q4) links to each other with the second end of the first electric capacity (C1); the source electrode of the 4th field effect transistor (Q4) links to each other with the source electrode of the 5th field effect transistor (Q5); the grid of the 6th field effect transistor (Q6) links to each other with the drain electrode of the 4th field effect transistor (Q4); the drain electrode of the 6th field effect transistor (Q6) links to each other with the grid of charging control switch pipe (Q2) as the output (OUT) of described oscillator, and the source electrode of the 6th field effect transistor (Q6) links to each other with the source electrode of the 5th field effect transistor (Q5).
3. the charge-discharge protection circuit of lithium battery according to claim 1; it is characterized in that: described oscillator comprises: the 7th field effect transistor (Q7); the 5th resistance (R5); the 6th resistance (R6); the 7th resistance (R7); the 8th resistance (R8); the 3rd electric capacity (C3) and operational amplifier (CP); wherein; the grid of the 7th field effect transistor (Q7) links to each other with the control of discharge output signal end of charging-discharging controller as the input (IN) of described oscillator; the source electrode of the 7th field effect transistor (Q7) links to each other with the lithium battery group is anodal; the drain electrode of the 7th field effect transistor (Q7) links to each other with the first end of the 5th resistance (R5); the second end of the 5th resistance (R5) links to each other with the in-phase input end of operational amplifier (CP); the first end of the 6th resistance (R6) links to each other with the in-phase input end of operational amplifier (CP); the second end of the 6th resistance (R6) links to each other with the output of operational amplifier (CP); the first end of the 7th resistance (R7) links to each other with the in-phase input end of operational amplifier (CP); the second end of the 7th resistance (R7) links to each other with the source electrode of charging control switch pipe (Q2); the first end of the 8th resistance (R8) links to each other with the inverting input of operational amplifier (CP); the second end of the 8th resistance (R8) links to each other with the output of operational amplifier (CP); the first end of the 3rd electric capacity (C3) links to each other with the inverting input of operational amplifier (CP); the second end of the 3rd electric capacity (C3) links to each other with the source electrode of charging control switch pipe (Q2), and the output of operational amplifier (CP) links to each other with the grid of charging control switch pipe (Q2) as the output (OUT) of described oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470394 CN202798079U (en) | 2012-09-14 | 2012-09-14 | Charging/discharging protection circuit of lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220470394 CN202798079U (en) | 2012-09-14 | 2012-09-14 | Charging/discharging protection circuit of lithium battery |
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| CN202798079U true CN202798079U (en) | 2013-03-13 |
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| CN 201220470394 Expired - Lifetime CN202798079U (en) | 2012-09-14 | 2012-09-14 | Charging/discharging protection circuit of lithium battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832674A (en) * | 2012-09-14 | 2012-12-19 | 何岳明 | Charging/discharging protection circuit of lithium battery |
| CN106972574A (en) * | 2017-04-25 | 2017-07-21 | 航天科技控股集团股份有限公司 | The vehicle-mounted charge-discharge circuit of lithium battery with defencive function |
-
2012
- 2012-09-14 CN CN 201220470394 patent/CN202798079U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832674A (en) * | 2012-09-14 | 2012-12-19 | 何岳明 | Charging/discharging protection circuit of lithium battery |
| CN102832674B (en) * | 2012-09-14 | 2015-02-04 | 何岳明 | Charging/discharging protection circuit of lithium battery |
| CN106972574A (en) * | 2017-04-25 | 2017-07-21 | 航天科技控股集团股份有限公司 | The vehicle-mounted charge-discharge circuit of lithium battery with defencive function |
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Granted publication date: 20130313 Effective date of abandoning: 20150204 |
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