CN2791888Y - Chargeable cell with protective circuit - Google Patents
Chargeable cell with protective circuit Download PDFInfo
- Publication number
- CN2791888Y CN2791888Y CN 200520111201 CN200520111201U CN2791888Y CN 2791888 Y CN2791888 Y CN 2791888Y CN 200520111201 CN200520111201 CN 200520111201 CN 200520111201 U CN200520111201 U CN 200520111201U CN 2791888 Y CN2791888 Y CN 2791888Y
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- circuit
- discharge
- protective circuit
- charging
- electric core
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- Expired - Lifetime
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- Y02E60/12—
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a chargeable cell, which comprises a charging electric core and a charging and discharging circuit connected with the electric core, wherein the charging and discharging circuit comprises a protective circuit and a voltage reducing circuit. The protective circuit can be an over-voltage protective circuit, or an under-voltage protective circuit, or an over-current protective circuit, or the combination of the protective circuits. The voltage reducing circuit is a transistor voltage reducing output circuit. The charging electric core and the charging and discharging circuit are assembled in a cell casing after connected with each other and are respectively provided with a charging negative electrode and a discharging negative electrode. The utility model has the advantages of consistent output voltage of the discharge of the cell and a disposable cell, protection in the process of charge and discharge, high safety, reliability and long service life.
Description
Technical field
The utility model relates to supply unit, especially relates to a kind of supply unit that can discharge and recharge.Be applicable to the power supply of portable electron device.
Background technology
At present a lot of disposable batteries is arranged on the market, as alkaline battery, disposable lithium-battery, nickel-cadmium cell and Ni-MH battery etc., its principle is that chemical energy is converted into electric energy, often use a period of time after electric energy exhaust.Just use at every turn and can not use, use not only cost greatly, and can cause very big pollution environment.
Traditional rechargeable battery, its charging method is directly electric energy to be converted into chemical energy.Lithium ion battery particularly overcharges and overdischarge all can damage battery, even the hidden danger of blast is arranged.And its output voltage does not often meet the operating voltage of common electronic installation.
Summary of the invention
In order to remedy above-mentioned defective, the purpose of this utility model is, a kind of stable, safe, consistent with the output voltage of disposable battery rechargeable battery is provided.
For achieving the above object; the utility model adopts following technical scheme: design a kind of rechargeable battery; it comprises the electric core of charging and charges and discharge circuit with the electric core of charging is connected; this charges and discharge circuit and comprises protective circuit, and described protective circuit comprises excess voltage protection, under voltage protection circuit and circuit overcurrent protection.Can effectively prevent overcharging and over-discharge can of rechargeable battery thus, thereby prolong the useful life of rechargeable battery.
The described circuit that charges and discharge also comprises reduction voltage circuit, and this reduction voltage circuit is a transistor step-down output circuit.The effect of reduction voltage circuit is to make the output voltage of rechargeable battery meet the operating voltage of common electronic installation, to replace the primary cell of frequent replacing, helps economizing on resources and environmental protection.
The described protective circuit that charges and discharge circuit contains li-ion cell protection chip U1, field effect transistor U2-A and U2-B, and described field effect transistor U2-A and U2-B are connected in series mutually, and their signal input end connects signal output part CO and the DO of chip U1 respectively; Be serially connected in the charging negative pole of protective circuit and connect between the discharge negative pole of load as the transistor Q1 of reduction voltage circuit.
The electric core of described charging is assembled in the battery container after circuit is connected with described charging and discharging.
Compared with prior art, the utility model rechargeable battery has following advantage:
1. the discharge output voltage of rechargeable battery is consistent with the output voltage of disposable battery.
2. the charge and discharge process of rechargeable battery has protection, and is therefore safe in utilization, reliable, the life-span is long.
Description of drawings
Description of drawings of the present utility model is as follows:
Fig. 1 is the circuit block diagram of the utility model rechargeable battery.
Fig. 2 charges and discharge the circuit principle schematic for the utility model rechargeable battery embodiment's.
Fig. 3 is the package assembly schematic diagram of the utility model rechargeable battery embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described.
As shown in Figure 1, this rechargeable battery comprises, the lithium ion circuit that charges and discharge that electric core and the protective circuit that is connected electric core and reduction voltage circuit form that charges.
Because lithium-ion electric core to relatively strictness of voltage request, overcharges and overdischarge all can damage battery, so we have adopted the special-purpose single-unit li-ion cell protection chip U1 of company of Ricoh, model is R5426.By sealing in the break-make that the very little field effect transistor U2-A of two impedances and U2-B control charging and discharging circuit on the circuit charging and discharging, to reach the effect of protection battery, its circuit theory diagrams as shown in Figure 2.The described protective circuit that charges and discharge circuit contains li-ion cell protection chip U1, field effect transistor U2-A and U2-B, triode Q1, capacitor C 1～C2 and the resistance R 1～R2 that company of Ricoh model is R5426; Described field effect transistor U2-A and U2-B are connected in series mutually, and their signal input end connects signal output part CO and the DO of chip U1 respectively; Be serially connected in the charging negative pole of protective circuit and connect between the discharge negative pole of load as the transistor Q1 of reduction voltage circuit.
Its operation principle is that the control signal of field effect transistor is by the voltage and the size that charges and discharge the electric current on the circuit of U1 detecting lithium-ion electric core.When electric core overtension, U1 control U2-A disconnects, and stops charging.When electric core brownout or discharging current were excessive, U1 control U2-B disconnected, and stops discharge.Prevent that electric core from overcharging and the purpose of overdischarge thereby reach.So its protective circuit is the combination of overvoltage protection, under voltage protection and overcurrent protection.
Lithium cell voltage generally arrives 4.2V at 3.6V, and is if directly to the power device power supply of nominal 3V voltage, obviously too high.Be to reduce voltage, we have used a transistor Q1 to seal between the charging negative pole of protective circuit and the discharge negative pole that is connected load.When battery operated, generally have electric current by the time have the 0.7V-0.8V pressure drop on the triode, like this, the voltage that the load two ends obtain will be dropped to about 3V.Certainly, this voltage is not steady state value, can change with cell voltage, but this changing value is an acceptable to electronic installation (as digital camera).
As shown in Figure 3, lithium-ion electric core 2 with charge and discharge circuit 1 usefulness bar shaped nickel sheet 6,7 and be connected; Charge and discharge circuit 1 and be fixed on the positive terminal of lithium cell 2 by support 3, double faced adhesive tape 14; The charging negative pole CH-and the discharge negative pole PACK-that charge and discharge circuit 1 are connected to box hat 8 and base plate 81 by bar shaped nickel sheet 5,4 respectively; The anodal BAT+ that charges and discharge circuit 1 passes the central authorities that rubber ring 11 places the top of box hat 8, constitutes the anodal PACK+ of battery; Be separated with fire prevention gummed paper 12 and 121 between lithium cell 2 and bar shaped nickel sheet 4,5,7 and the box hat 8; Inside and outside fast crust paper 9 and 10 of being equipped with respectively of base plate 81 are fixed on the negative pole end of lithium cell 2 by double faced adhesive tape 13.Be packaged in the plastic insulation sleeve pipe after the battery assembling, reserve the anode at battery top and the charging negative pole of anodal outer ring, and the discharge negative pole of battery bottom.
The embodiment of the utility model rechargeable battery has following electrical characteristic:
1. lithium-ion electric core parameter: cycle-index: more than 500 times, maximum charging voltage: 4.2V, charging ambient temperature are 0 ℃～45 ℃, and humidity 65% ± 20%, discharge environment temperature are-20 ℃～60 ℃, humidity 65% ± 20%;
2. protective circuit parameter: detection voltage: the 4.325V/CELL that overcharges, releasing voltage: the 4.075V/CELL that overcharges, overdischarge detects voltage: 2.3V/CELL, and voltage: 2.9V/CELL is removed in overdischarge, and overcurrent detects: 3.5A;
3. major parameter is exported in step-down: output voltage is for (Vb-0.7～Vb-3.0) V is that electric core voltage subtracts 0.7V～3.0V, allows output maximum current: 1A continuously, the efficient of reduction voltage circuit: about 80%;
4. the static current sinking of full machine is about 3uA;
5. load short circuit protection function is arranged.
Claims (9)
1. rechargeable battery that has protective circuit; it comprises the electric core of charging; it is characterized in that: also comprise the circuit that charges and discharge that is connected with the electric core of charging, this charges and discharge circuit and comprises protective circuit, and described protective circuit comprises excess voltage protection, under voltage protection circuit and circuit overcurrent protection.
2. the rechargeable battery that has protective circuit according to claim 1 is characterized in that: the described circuit that charges and discharge also comprises reduction voltage circuit.
3. the rechargeable battery that has protective circuit according to claim 2 is characterized in that: described reduction voltage circuit is a transistor step-down output circuit.
4. the rechargeable battery that has protective circuit according to claim 2, it is characterized in that: the described protective circuit that charges and discharge circuit contains protection chip U1, field effect transistor U2-A and U2-B, described field effect transistor U2-A and U2-B are connected in series mutually, and their signal input end connects signal output part CO and the DO of chip U1 respectively; Be serially connected in the charging negative pole of protective circuit and connect between the discharge negative pole of load as the transistor Q1 of reduction voltage circuit.
5. the rechargeable battery that has protective circuit according to claim 1 and 2 is characterized in that: describedly charge and discharge the positive terminal that circuit is fixed on the electric core of described charging, the electric core that charges is a bar shaped nickel sheet with the described lead that is connected that charges and discharge circuit.
6. the rechargeable battery that has protective circuit according to claim 5 is characterized in that: the electric core of described charging and charge and discharge circuit and bar shaped nickel sheet lead is encapsulated in the battery container, it charges and discharge electrode and is drawn and receive the battery container surface.
7. the rechargeable battery that has protective circuit according to claim 6 is characterized in that: described battery container is respectively arranged with charging negative pole and discharge negative pole.
8. the rechargeable battery that has protective circuit according to claim 7 is characterized in that: described charging negative pole is positioned at the outer ring of anode, and described discharge negative pole is positioned at the bottom of battery.
9. according to claim 1,2, the 4 or 8 described rechargeable batteries that have protective circuit, it is characterized in that: the electric core of described charging is lithium-ion electric core or ni-mh electricity core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520111201 CN2791888Y (en) | 2005-01-28 | 2005-06-09 | Chargeable cell with protective circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520054464.7 | 2005-01-28 | ||
| CN200520054464 | 2005-01-28 | ||
| CN 200520111201 CN2791888Y (en) | 2005-01-28 | 2005-06-09 | Chargeable cell with protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2791888Y true CN2791888Y (en) | 2006-06-28 |
Family
ID=36807940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520111201 Expired - Lifetime CN2791888Y (en) | 2005-01-28 | 2005-06-09 | Chargeable cell with protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2791888Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100589261C (en) * | 2007-06-27 | 2010-02-10 | 广州市展辉电子有限公司 | Chargeable battery |
| CN103311562A (en) * | 2012-03-12 | 2013-09-18 | 联想(北京)有限公司 | Charging battery, and charging control method and discharging control method thereof |
-
2005
- 2005-06-09 CN CN 200520111201 patent/CN2791888Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100589261C (en) * | 2007-06-27 | 2010-02-10 | 广州市展辉电子有限公司 | Chargeable battery |
| CN103311562A (en) * | 2012-03-12 | 2013-09-18 | 联想(北京)有限公司 | Charging battery, and charging control method and discharging control method thereof |
| CN103311562B (en) * | 2012-03-12 | 2015-06-03 | 联想(北京)有限公司 | Charging battery, and charging control method and discharging control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150609 Granted publication date: 20060628 |