CN214707142U - Lithium ion battery protection circuit - Google Patents
Lithium ion battery protection circuit Download PDFInfo
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- CN214707142U CN214707142U CN202023120497.0U CN202023120497U CN214707142U CN 214707142 U CN214707142 U CN 214707142U CN 202023120497 U CN202023120497 U CN 202023120497U CN 214707142 U CN214707142 U CN 214707142U
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Abstract
The application relates to a lithium ion battery protection circuit, which is applied to an electricity storage device, wherein the circuit comprises a main control chip, a first protection circuit and a second protection circuit, and the first protection circuit and the second protection circuit are connected with a power supply loop of the electricity storage device; the main control chip is provided with a first control end and a second control end, the first control end is connected with the first protection circuit, and the second control end is connected with the second protection circuit; the main control chip controls the on-off of the power supply loop of the power storage device by controlling the on-off of the first protection circuit and the protection circuit. The beneficial effects are that: when the lithium ion battery exceeds the safe voltage range and the safe temperature range in the using process, the circuit automatically cuts off a battery power supply loop, and the lithium ion battery is not charged or discharged, so that the use safety of a user is ensured.
Description
Technical Field
The application relates to the technical field of battery management systems, in particular to a lithium ion battery protection circuit.
Background
At present, with the increase of the application field of the lithium ion battery, the lithium ion battery is widely applied to the fields of smart phones, mobile charging devices, electric tools and dust collectors, but the lithium ion battery has high energy density due to high energy ratio, and if the lithium ion battery is excessively charged and discharged in the charging and discharging use process, the lithium ion battery body can generate a large amount of heat, so that the lithium ion battery can explode, catch fire and other safety problems, and the use safety of the lithium ion battery is a key concern of consumers.
Disclosure of Invention
In order to solve the above technical problems, the present application provides a lithium ion battery protection circuit, which is applied in an electrical storage device, the circuit includes a main control chip, a first protection circuit, and a second protection circuit,
the first protection circuit and the second protection circuit are connected with a power supply loop of the power storage device; the main control chip is provided with a first control end and a second control end, the first control end is connected with the first protection circuit, and the second control end is connected with the second protection circuit;
the main control chip controls the on-off of the power supply loop of the power storage device by controlling the on-off of the first protection circuit and the protection circuit.
Optionally, the first protection circuit comprises a trigger circuit, a switch circuit,
the switch circuit is connected to the power supply circuit and is connected to the first control end through a trigger circuit.
Optionally, the switch circuit comprises a first MOS transistor, a first resistor, a second resistor,
the grid electrode of the first MOS tube is connected with the trigger circuit through a first resistor, and a source electrode and a drain electrode are respectively connected to two ends of the power supply loop; and the second resistors are respectively connected between the grid electrode and the source electrode of the first MOS tube.
Optionally, the second protection circuit comprises a trigger circuit, a fuse circuit,
the fusing circuit is connected to the power supply circuit and is connected with the second control end through the trigger circuit.
Optionally, the fuse circuit includes a fuse, a third resistor,
the control end of the fuse is connected with the trigger circuit through a third resistor, and two connecting ends of the fuse are respectively connected to the power supply loop.
Optionally, the trigger circuit includes a second MOS transistor, a fourth resistor, a fifth resistor, a first capacitor, and a first diode;
the grid electrode of the second MOS tube is connected with the first control end or the second control end through a fourth resistor, the drain electrode is connected with the switch circuit or the fusing circuit through a first diode, and the source electrode is grounded; and the fifth resistor and the first capacitor are connected between the grid of the second MOS tube and the power ground.
Optionally, the power supply circuit is further included, the power supply circuit includes a power supply chip, a sixth resistor and a second capacitor,
the power supply input end of the power supply chip is connected with the power supply loop through a sixth resistor, and the power supply output end of the power supply chip is connected with the power supply end of the main control chip through a filter circuit.
Optionally, the filter circuit includes a seventh resistor and a third capacitor, the power output terminal of the power supply chip is connected to the power supply through the seventh resistor, and the third capacitor is connected between the power supply terminal and a power ground.
Optionally, the temperature detection circuit comprises a temperature sensor connected to the temperature detection end of the main control chip, and an eighth resistor, the other end of the eighth resistor is connected to the power output end of the power chip, and the other end of the temperature sensor is grounded.
Optionally, the main control chip is further provided with at least one voltage monitoring end, and the voltage monitoring end is connected with the battery of the power storage device through a ninth resistor.
The application discloses lithium ion battery protection circuit, its beneficial effect lies in: this application passes through temperature detection and voltage monitoring, carries out many-sided detection to the battery, simultaneously, adopts first protection circuit, second protection circuit, when surpassing safe voltage range and safe temperature range in lithium ion battery use, the automatic battery power supply circuit that cuts off of circuit no longer charges, discharges lithium ion battery to ensure user safety in utilization.
Drawings
Fig. 1 is a schematic circuit diagram of a communication activation circuit according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.
In the embodiment shown in fig. 1, the present application provides a lithium ion battery protection circuit, which is applied to an electrical storage device, and includes a main control chip U1, a first protection circuit, and a second protection circuit, where the first protection circuit and the second protection circuit are both connected to a power supply loop of the electrical storage device; the main control chip U1 is provided with a first control end U1_ CO and a second control end U1_ FUSE, the first control end U1_ CO is connected with a first protection circuit, and the second control end U1_ FUSE is connected with a second protection circuit; the main control chip U1 controls the power supply loop of the power storage device to be switched on and off by controlling the switching on and off of the first protection circuit and the protection circuit. This application passes through temperature detection and voltage monitoring, carries out many-sided detection to the battery, simultaneously, adopts first protection circuit, second protection circuit, when surpassing safe voltage range and safe temperature range in lithium ion battery use, the automatic battery power supply circuit that cuts off of circuit no longer charges, discharges lithium ion battery to ensure user safety in utilization. The power storage device may be a battery or a battery pack. The main control chip can be a chip with model ML62Q 1345.
In some embodiments, the first protection circuit includes a trigger circuit 3 and a switch circuit 1, the switch circuit 1 is connected to the power supply loop, and the switch circuit 1 is connected to the first control terminal U1_ CO through the trigger circuit 3. Specifically, the switch circuit 1 includes a first MOS transistor Q1, a first resistor R1, and a second resistor R2, a gate of the first MOS transistor Q1 is connected to the trigger circuit 3 through the first resistor R1, and a source and a drain are respectively connected to two ends of the power supply loop B + -P +; the second resistors R2 are respectively connected between the gate and the source of the first MOS transistor Q1. In this embodiment, the switch circuit 1 receives a signal of the first control terminal U1_ CO through the trigger circuit 3, and controls the power supply loop B + -P + of the power storage device to be switched on and off; the first resistor R1 and the second resistor R2 are used for voltage division. The trigger circuit 3 comprises a second MOS transistor Q2, a fourth resistor R4, a fifth resistor R5, a first capacitor C1 and a first diode D1; the gate of the second MOS transistor Q2 is connected to the first control terminal U1_ CO through a fourth resistor R4, the drain is connected to the switch circuit 1 through a first diode D1, and the source is grounded; the fifth resistor R5 and the first capacitor C1 are both connected between the gate of the second MOS transistor Q2 and the power ground. The fourth resistor R4 and the fifth resistor R5 are used for voltage division, the first capacitor C1 is used for filtering, and the first diode D1 is used for protecting the circuit; when the cell voltage of the power storage device is higher than the cell voltage protection voltage threshold or the cell temperature protection voltage threshold, the first control terminal U1_ CO outputs a high level, the high level passes through the trigger circuit 3 to the first MOS transistor Q1, the second MOS transistor Q2 is turned on, and the first MOS transistor Q1 is turned off. When the cell voltage of the power storage device is lower than the cell voltage protection voltage threshold or the cell temperature protection voltage threshold, the low level of the first control end U1_ CO controls the gate of the first MOS transistor Q1 to be switched on through the trigger circuit 3, the battery pack is normally charged, and normal charging work protection is realized.
In some embodiments, the second protection circuit includes a trigger circuit and a FUSE circuit 2, the FUSE circuit 2 is connected to the power supply loop B + -P +, and the FUSE circuit 2 is connected to the second control terminal U1_ FUSE through the trigger circuit. Specifically, the FUSE circuit 2 includes a FUSE and a third resistor R3, a control terminal of the FUSE is connected to the trigger circuit through the third resistor R3, and two connection terminals of the FUSE are respectively connected to the power supply circuit B + -P +. In the embodiment, the fusing circuit 2 receives a signal of the second control terminal U1_ FUSE through the trigger circuit, and controls the power supply loop B + -P + of the power storage device to be fused; the third resistor R3 is used for voltage division. The trigger circuit comprises a second MOS tube, a fourth resistor, a fifth resistor, a first capacitor and a first diode; the grid electrode of the second MOS tube is connected with the first control end U1_ CO or the second control end U1_ FUSE through a fourth resistor, the drain electrode is connected with the switch circuit 1 or the fusing circuit 2 through a first diode, and the source electrode is grounded; the fifth resistor and the first capacitor are connected between the grid of the second MOS tube and the power ground. The fourth resistor and the fifth resistor are used for voltage division, the first capacitor is used for filtering, and the first diode is used for protecting the circuit. The FUSE has three terminals: the control end and the two connecting ends are respectively connected to the two ends of the loop, and the control end is connected with the trigger circuit. Under the condition that the cell voltage of the power storage device works normally, the second control end U1_ FUSE outputs low level and passes through the second MOS tube to the FUSE FUSE, the second MOS tube is cut off, the control end of the FUSE FUSE is high level, and the charging current normally charges the battery pack through the FUSE FUSE. When the cell voltage is higher than the cell safety voltage range or the cell temperature is higher than the safety temperature range, the second control end U1_ FUSE outputs a high level, the FUSE FUSE control end is pulled down through the conduction of the second MOS tube, so that the FUSE FUSE element is fused, the battery pack is disconnected with the charger and the load, and the self-fusing safety protection is realized. The FUSE may be a FUSE model WPF05 A7R.
In some embodiments, the power supply circuit 4 is further included, the power supply circuit 4 includes a power supply chip U2, a sixth resistor R6, and a second capacitor C2, a power supply input end of the power supply chip U2 is connected to the power supply loop B + -P + through the sixth resistor R6, and a power supply output end VCC of the power supply chip U2 is connected to a power supply end of the main control chip U1 through a filter circuit. In this embodiment, the power circuit 4 converts the power of the power supply loop B + -P + into a power suitable for the operating voltage of the main control chip U1 for the main control chip U1 to supply power. The sixth resistor R6 is used for voltage division, and the second capacitor C2 is used for filtering. The power chip can be a power chip with a model number TLV 70433.
In some embodiments, the filter circuit includes a seventh resistor R7 and a third capacitor C3, the power output VCC of the power chip U2 is connected to the power supply through the seventh resistor R7, and the third capacitor C3 is connected between the power supply terminal and the power ground. The seventh resistor R7 is used for voltage division, and the third capacitor C3 is used for filtering; the circuit is protected by a filter circuit.
In some embodiments, the temperature detection circuit 5 is further included, the temperature detection circuit 5 includes a temperature sensor TH1 and an eighth resistor R8 connected to the temperature detection end of the main control chip U1, the other end of the eighth resistor R8 is connected to the power output end VCC of the power chip U2, and the other end of the temperature sensor TH1 is grounded. The temperature sensor may be a 10K NTC temperature sensor. The main control chip U1 is also provided with at least one voltage monitoring end, and the voltage monitoring end is connected with a battery of the power storage device through a ninth resistor R9; the main control chip can be provided with a plurality of voltage monitoring ends which are connected with a plurality of batteries and used for monitoring the voltages of the batteries. This application passes through temperature detection and voltage monitoring, carries out many-sided detection to the battery, simultaneously, adopts first protection circuit, second protection circuit, when surpassing safe voltage range and safe temperature range in lithium ion battery use, the automatic battery power supply circuit that cuts off of circuit no longer charges, discharges lithium ion battery to ensure user safety in utilization.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.
Claims (10)
1. A lithium ion battery protection circuit is characterized by being applied to a power storage device and comprising a main control chip, a first protection circuit and a second protection circuit,
the first protection circuit and the second protection circuit are connected with a power supply loop of the power storage device; the main control chip is provided with a first control end and a second control end, the first control end is connected with the first protection circuit, and the second control end is connected with the second protection circuit;
the main control chip controls the on-off of the power supply loop of the power storage device by controlling the on-off of the first protection circuit and the protection circuit.
2. The lithium ion battery protection circuit of claim 1, wherein the first protection circuit comprises a trigger circuit and a switch circuit,
the switch circuit is connected to the power supply circuit and is connected to the first control end through a trigger circuit.
3. The lithium ion battery protection circuit of claim 2, wherein the switch circuit comprises a first MOS transistor, a first resistor, and a second resistor,
the grid electrode of the first MOS tube is connected with the trigger circuit through a first resistor, and a source electrode and a drain electrode are respectively connected to two ends of the power supply loop; and the second resistors are respectively connected between the grid electrode and the source electrode of the first MOS tube.
4. The lithium ion battery protection circuit of claim 3, wherein the second protection circuit comprises a trigger circuit and a fuse circuit,
the fusing circuit is connected to the power supply circuit and is connected with the second control end through the trigger circuit.
5. The lithium ion battery protection circuit of claim 4, wherein the fuse circuit comprises a fuse, a third resistor,
the control end of the fuse is connected with the trigger circuit through a third resistor, and two connecting ends of the fuse are respectively connected to the power supply loop.
6. The lithium ion battery protection circuit according to claim 5, wherein the trigger circuit comprises a second MOS transistor, a fourth resistor, a fifth resistor, a first capacitor, and a first diode;
the grid electrode of the second MOS tube is connected with the first control end or the second control end through a fourth resistor, the drain electrode is connected with the switch circuit or the fusing circuit through a first diode, and the source electrode is grounded; and the fifth resistor and the first capacitor are connected between the grid of the second MOS tube and the power ground.
7. The lithium ion battery protection circuit of claim 1, further comprising a power circuit, wherein the power circuit comprises a power chip, a sixth resistor, and a second capacitor,
the power supply input end of the power supply chip is connected with the power supply loop through a sixth resistor, and the power supply output end of the power supply chip is connected with the power supply end of the main control chip through a filter circuit.
8. The lithium ion battery protection circuit of claim 7, wherein the filter circuit comprises a seventh resistor and a third capacitor, the power output terminal of the power chip is connected to the power supply through the seventh resistor, and the third capacitor is connected between the power supply terminal and a power ground.
9. The lithium ion battery protection circuit of claim 7, further comprising a temperature detection circuit, wherein the temperature detection circuit comprises a temperature sensor connected to the temperature detection end of the main control chip, and an eighth resistor, the other end of the eighth resistor is connected to the power output end of the power chip, and the other end of the temperature sensor is grounded.
10. The lithium ion battery protection circuit of claim 1, wherein the main control chip is further provided with at least one voltage monitoring terminal, and the voltage monitoring terminal is connected with the battery of the power storage device through a ninth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023120497.0U CN214707142U (en) | 2020-12-22 | 2020-12-22 | Lithium ion battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023120497.0U CN214707142U (en) | 2020-12-22 | 2020-12-22 | Lithium ion battery protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214707142U true CN214707142U (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023120497.0U Active CN214707142U (en) | 2020-12-22 | 2020-12-22 | Lithium ion battery protection circuit |
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| CN (1) | CN214707142U (en) |
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- 2020-12-22 CN CN202023120497.0U patent/CN214707142U/en active Active
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