CN212323786U - Heavy current lithium cell protection device - Google Patents
Heavy current lithium cell protection device Download PDFInfo
- Publication number
- CN212323786U CN212323786U CN202021281859.1U CN202021281859U CN212323786U CN 212323786 U CN212323786 U CN 212323786U CN 202021281859 U CN202021281859 U CN 202021281859U CN 212323786 U CN212323786 U CN 212323786U
- Authority
- CN
- China
- Prior art keywords
- mos tube
- battery
- mos
- diode
- poles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a high-current lithium battery protection device, which comprises a MOS tube Q1, a MOS tube Q2, a diode D1, a diode D2 and a relay K1 controlled by a control device; the diode D1 is connected in parallel between the D-S poles of the MOS tube Q1, the diode D2 is connected in parallel between the D-S poles of the MOS tube Q2, and the P poles of the diode D1 and the diode D2 are respectively connected with the S poles of the MOS tube Q1 and the MOS tube Q2; two ends of the relay K1 are respectively connected with S poles of the MOS tube Q1 and the MOS tube Q2. The utility model discloses in the lithium battery protection device that provides connect in parallel the relay at charge-discharge protection tube both ends, absorb and fill, discharge the heavy current, protect the MOS pipe that fills, discharge protection, prevent that the MOS pipe from burning out owing to overflowing the production heat.
Description
Technical Field
The utility model relates to a lithium cell charge-discharge protection circuit field, especially a heavy current lithium cell protection device.
Background
Lithium batteries are used in energy storage systems as a high energy density rechargeable battery. Due to the characteristics of the lithium battery cell, it is desirable to avoid overcharging or overdischarging of the cell.
Chinese utility model patent application publication No. CN 105356421 a just discloses a lithium cell group charge-discharge protection circuit, and this lithium cell group protection circuit includes battery management module, the control unit MCU, an output port of MCU links to each other with the input port of control signal amplifier U2 that discharges, and another output port links to each other with the input port of control signal amplifier U1 that charges, the output port of control signal amplifier U2 that discharges links to each other with the gate of the MOSFET that discharges, the output port of control signal amplifier U1 that charges the gate of the MOSFET that charges links to each other, the MOSFET that discharges and the source of the MOSFET that charges all ground connection, wherein: two ends of the battery management module are respectively connected with the lithium battery pack and the MCU and used for detecting the current voltage value of the lithium battery pack; the MCU is used for comparing the detected current voltage value of the lithium battery pack with a preset safe voltage value range; the MCU is also used for releasing a low level signal to the discharge control signal amplifier U2 when the current voltage value is lower than the preset safe voltage value range, and the low level signal is amplified and then output to the discharge MOSFET to control the discharge MOSFET to enter a cut-off state; and the MCU is also used for releasing a low level signal to the charging control signal amplifier U1 when the current voltage value is higher than the preset safe voltage value range, and the low level signal is amplified and then output to the charging MOSFET to control the charging MOSFET to enter a cut-off state.
In the prior art, two groups of MOS (metal oxide semiconductor) tubes which are opposite to each other are adopted, when a battery core is overcharged, the charging MOS tube Q1 is switched off, and charging is not allowed; when the battery core is over-discharged, the discharging MOS tube Q2 is switched off, and discharging is not allowed. The MOS tube has weak over-current capability and is easy to damage under the condition of large current.
SUMMERY OF THE UTILITY MODEL
The utility model discloses in to present lithium cell charge-discharge protection device, adopt the MOS pipe to do the switch, turn-off corresponding MOS pipe when electric core overcharge or cross put, this kind of mode MOS pipe overcurrent capacity is relatively weak, damages easily under the condition of heavy current, provides a heavy current lithium cell protection device.
The utility model discloses realize that its technical purpose technical scheme is: a high-current lithium battery protection device comprises a control device, an MOS tube Q1 and an MOS tube Q2, wherein the MOS tube Q1 and the MOS tube Q2 are arranged on a battery charging and discharging loop and are connected with a D pole; the control device is respectively connected with G poles of an MOS tube Q1 and an MOS tube Q2; the device also comprises a diode D1, a diode D2 and a relay K1 controlled by the control device;
the diode D1 is connected in parallel between the D-S poles of the MOS tube Q1, the diode D2 is connected in parallel between the D-S poles of the MOS tube Q2, and the P poles of the diode D1 and the diode D2 are respectively connected with the S poles of the MOS tube Q1 and the MOS tube Q2;
two ends of the relay K1 are respectively connected with S poles of the MOS tube Q1 and the MOS tube Q2.
Further, in the above large current lithium battery protection device: the MOS tube Q1 and the MOS tube Q2 connected with the D pole are arranged between the cathode B-of the battery and the cathode P-of the battery output; the S electrode of the MOS tube Q2 is connected with the cathode B-of the battery to form an overdischarge protection switch tube; the S-pole of the MOS transistor Q1 forms the battery output negative pole, and the MOS transistor Q1 serves as an overcharge protection switching transistor.
Further, in the above large current lithium battery protection device: the MOS tube Q1 and the MOS tube Q2 connected with the D pole are arranged between the battery anode B + and the battery output anode P +; the S pole of the MOS tube Q2 is connected with the battery anode B + to form an overcharge protection switching tube; the S-pole of the MOS transistor Q2 forms the battery output anode, and the MOS transistor Q2 serves as an overdischarge protection switching transistor.
The utility model discloses in the lithium battery protection device that provides connect in parallel the relay at charge-discharge protection tube both ends, absorb and fill, discharge the heavy current, protect the MOS pipe that fills, discharge protection, prevent that the MOS pipe from burning out owing to overflowing the production heat.
The present invention will be described in more detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is the circuit schematic diagram of the high-current lithium battery protection device of the utility model.
Detailed Description
Diode D1 is connected in parallel between the D-S poles of MOS transistor Q1, diode D2 is connected in parallel between the D-S poles of MOS transistor Q2, and the P poles of diode D1 and diode D2 are connected with the S poles of MOS transistor Q1 and MOS transistor Q2 respectively.
Two ends of the relay K1 are connected to the S-poles of the MOS transistor Q1 and the MOS transistor Q2, respectively.
In this embodiment, in order to perform charge and discharge protection on the high-current lithium battery, the protection circuit (device) may be disposed between the battery positive electrode B + and the battery output positive electrode P + of the battery, and may also be disposed between the battery negative electrode B-and the battery output negative electrode P-.
The method is generally arranged between a battery cathode B-and a battery output cathode P-of a high-current lithium battery according to requirements, and comprises the following specific steps: the MOS tube Q1 and the MOS tube Q2 connected with the D pole are arranged between the cathode B-of the battery and the cathode P-of the battery output; the S electrode of the MOS tube Q2 is connected with the cathode B-of the battery to form an overdischarge protection switch tube; the S-pole of the MOS transistor Q1 forms the battery output negative pole, and the MOS transistor Q1 serves as an overcharge protection switching transistor.
In addition, in some other embodiments, a protection circuit (device) may be disposed between the battery positive electrode B + and the battery output positive electrode P + of the battery, and the MOS transistor Q1 and the MOS transistor Q2, in which the specific circuit connection is D-pole connection, are disposed between the battery positive electrode B + and the battery output positive electrode P +; the S pole of the MOS tube Q2 is connected with the battery anode B + to form an overcharge protection switching tube; the S-pole of the MOS transistor Q2 forms the battery output anode, and the MOS transistor Q2 serves as an overdischarge protection switching transistor.
The protection method of the large-battery lithium battery protection circuit of the embodiment is executed by a control device and comprises the following steps:
1) the positive and negative electrodes of the batteries after being connected in series are B + and B-;
2) the output of the battery pack is B + and P-, and B-can be output as P-only through the protection circuits Q1, Q2 and K1;
3) in normal operation, the relay K1 is turned on (the MOS transistors Q1 and Q2 may be turned on, and may not be turned on);
4) when the lithium battery is full and needs to stop charging:
1> if Q1, Q2 are not turned on, then control Q1, Q2 to be turned on;
2> turn off the K1, wherein the voltage across the K1 is zero due to the conduction of the Q1 and the Q2, so that the K1 can be safely turned off;
3> turn off Q1, at which time the battery pack cannot be charged, but the battery pack can still be discharged normally due to the presence of D1;
5) when the lithium battery is discharged:
1, discharging the lithium battery, and supplying power to a load by current through D1 and Q2;
2> control the Q1 to be conducted, and the current supplies power to the load through Q1 and Q2;
3, controlling the K1 to pull in, wherein the voltage at two ends of the K1 is zero due to the conduction of the Q1 and the Q2, so that the K3578 can be safely pulled in;
4, after that, K1 bears the heavy current to be continuously conducted, and Q1 and Q2 can be kept on or controlled to be off;
6) when the lithium battery is over-discharged and the discharge needs to be stopped:
1> if Q1, Q2 are not turned on, then control Q1, Q2 to be turned on;
2> controlling the K1 to be turned off, wherein the voltage across the K1 is zero due to the conduction of the Q1 and the Q2, so that the K3578 can be safely turned off;
3> turn off Q2, at which time the battery pack cannot be charged, but the battery pack can still be charged normally due to the presence of D2;
7) when the battery is charged:
1, external charging voltage is loaded to two ends of a battery pack, and current is used for charging the lithium battery through Q1 and D2;
2, controlling the Q2 to be switched on, and charging the lithium battery by current through Q1 and Q2;
3, controlling the K1 to pull in, wherein the voltage at two ends of the K1 is zero due to the conduction of the Q1 and the Q2, so that the K3578 can be safely pulled in;
4, after that, K1 bears large current to be continuously conducted, and Q1 and Q2 can be kept on or off.
In this embodiment:
under the condition of keeping the original control method of the MOS tube protection circuit, the through-current capacity and the anti-impact current capacity of the protection circuit can be greatly enlarged.
The relay with the voltage lower than the rated voltage of the battery is adopted, so that the current capacity and the anti-impact current capacity can be expanded at low cost.
Claims (3)
1. A high-current lithium battery protection device comprises a control device, an MOS tube Q1 and an MOS tube Q2 which are arranged on a battery charging and discharging loop and are connected with a D pole; the control device is respectively connected with G poles of the MOS tube Q1 and the MOS tube Q2; the method is characterized in that: the device also comprises a diode D1, a diode D2 and a relay K1 controlled by the control device;
the diode D1 is connected between the D-S poles of the MOS tube Q1 in parallel, the diode D2 is connected between the D-S poles of the MOS tube Q2 in parallel, and the P poles of the diode D1 and the diode D2 are respectively connected with the S poles of the MOS tube Q1 and the MOS tube Q2;
and two ends of the relay K1 are respectively connected with S poles of the MOS tube Q1 and the MOS tube Q2.
2. A high current lithium battery protection device as claimed in claim 1, wherein: the MOS tube Q1 and the MOS tube Q2 connected with the D pole are arranged between the battery cathode B-and the battery output cathode P-; the S electrode of the MOS tube Q2 is connected with the cathode B-of the battery to form an overdischarge protection switch tube; the S-pole of the MOS transistor Q1 forms the battery output negative pole, and the MOS transistor Q1 serves as an overcharge protection switching transistor.
3. A high current lithium battery protection device as claimed in claim 1, wherein: the MOS tube Q1 and the MOS tube Q2 connected with the D pole are arranged between the battery anode B + and the battery output anode P +; the S pole of the MOS tube Q2 is connected with the battery anode B + to form an overcharge protection switching tube; the S-pole of the MOS transistor Q2 forms the battery output anode, and the MOS transistor Q2 serves as an overdischarge protection switching transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021281859.1U CN212323786U (en) | 2020-07-02 | 2020-07-02 | Heavy current lithium cell protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021281859.1U CN212323786U (en) | 2020-07-02 | 2020-07-02 | Heavy current lithium cell protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212323786U true CN212323786U (en) | 2021-01-08 |
Family
ID=74028478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021281859.1U Active CN212323786U (en) | 2020-07-02 | 2020-07-02 | Heavy current lithium cell protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212323786U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585330A (en) * | 2020-07-02 | 2020-08-25 | 深圳市欧力普能源与自动化技术有限公司 | High-current lithium battery protection device and battery protection method |
-
2020
- 2020-07-02 CN CN202021281859.1U patent/CN212323786U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585330A (en) * | 2020-07-02 | 2020-08-25 | 深圳市欧力普能源与自动化技术有限公司 | High-current lithium battery protection device and battery protection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11522370B2 (en) | Equalization circuit, a charging device and an energy storage device | |
| CN102005794B (en) | Battery pack charging management system and method | |
| CN103036286A (en) | Safe charge-discharge control method of all-vanadium redox flow battery comprising direct current / direct current (DC / DC) converter | |
| CN201113407Y (en) | Lithium ion batteries protector | |
| CN109586371A (en) | The series-parallel suitching type battery circuit of charge and discharge | |
| CN212323786U (en) | Heavy current lithium cell protection device | |
| CN202872396U (en) | Charge and discharge equalization circuit for series battery based on inductance energy storage | |
| CN111181224A (en) | Charging system for multi-section series battery pack and charging method thereof | |
| CN111585330A (en) | High-current lithium battery protection device and battery protection method | |
| CN106329594B (en) | Device and method for limiting current during charging of battery of energy storage system | |
| CN203813423U (en) | Universal protection system for lithium battery | |
| CN102832666A (en) | Inductive energy storage based series battery pack discharging balancing circuit | |
| CN201113506Y (en) | Circuit capable of charging low voltage batteries | |
| CN203660568U (en) | Parallel charging circuit and protection circuit of lead-acid series storage battery group | |
| CN203660569U (en) | Parallel charging circuit of power lithium battery group and protection circuit | |
| CN210839032U (en) | GPS locator lithium battery charging and discharging protection circuit | |
| CN203104045U (en) | Main circuit of solar charging controller | |
| CN211701533U (en) | Charging system for multi-section series battery pack | |
| CN203398833U (en) | Battery charging/discharging circuit of uninterruptible power supply | |
| CN105743188A (en) | Plumbic acid battery pack protection system | |
| CN111697666A (en) | Equalizing charging circuit and equalizing method | |
| CN202260411U (en) | Protection plate special for iron phosphate lithium batteries | |
| CN102832674B (en) | Charging/discharging protection circuit of lithium battery | |
| CN202798079U (en) | Charging/discharging protection circuit of lithium battery | |
| CN201069797Y (en) | 9V lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |