Leakage-current-free single battery inspection line

Abstract

The utility model provides a leakage-current-free single battery inspection line which comprises a plurality of single batteries, and the positive electrode and the negative electrode of each single battery are outwards connected with an inspection line. The positive electrode of the first battery is sequentially connected in series with a first diode, a first detection resistor and a first divider resistor outwards, then is sequentially connected in series with a second divider resistor, a second detection resistor and a second diode to be connected with the negative electrode of the first battery and is also connected with the positive electrode of the adjacent second battery, and the positive electrode and the negative electrode are sequentially superposed and circulated. According to the single battery inspection line without leakage current provided by the utility model, the diodes are additionally arranged in the line, so that the inspection lines of two adjacent single batteries can be prevented from being conducted on the premise that the MOS tubes and the relays are disconnected, the electric leakage phenomenon when the inspection lines are disconnected is avoided, and the current consumption on the detection resistors after the relays are disconnected is also reduced.

Description

Technical Field

[0001] The utility model relates to a single-cell battery inspection circuit with no leakage current. Background Art

[0002] New regulations for security power supplies require the detection and reporting of the voltage of a single lead-acid battery. The existing circuit uses an MCU to sample the resistor-divided voltage of each battery cell and report it to the system. However, due to the loss of the sampling resistor, the static discharge current of the battery does not meet the regulatory requirement of less than 10-5CA.

[0003] Traditional circuits detect the voltage of a single battery cell by using a differential amplifier or adding a voltage follower, which forms a loop for the single battery cell through the circuit. Since the detection circuit requires a series resistor and detects the voltage of the resistor to calculate the voltage of the single battery cell, a complete circuit loop is formed in the static state, which also causes leakage. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a single-cell battery inspection circuit with no leakage current, which aims to realize the single-cell battery voltage detection of the security battery through the circuit design. When the detection circuit is disconnected, the circuit connected to the battery is blocked to prevent leakage of the circuit.

[0005] To solve the above technical problems, the technical solution of the present invention is: a leakage-free single-cell battery inspection circuit, comprising a plurality of single-cell batteries arranged as a first battery, a second battery, ..., an N-th battery, wherein the positive and negative poles of each adjacent single-cell battery are connected to each other; an inspection circuit is externally connected to the positive and negative poles of each single-cell battery; the positive pole of the first battery is connected in series with a first diode, a first detection resistor, and a first voltage-dividing resistor, and then connected in series with a second voltage-dividing resistor, a second detection resistor, and a second diode, connected to the negative pole of the first battery, and also connected to the positive pole of the adjacent second battery, and the cycle is superimposed in sequence; finally, the positive pole of the N-th battery is connected in series with an N-th diode, an N-th detection resistor, and an N-th voltage-dividing resistor, and then connected in series with an N+1-th voltage-dividing resistor, an N+1-th detection resistor, and an N+1-th diode, connected to the negative pole of the N-th battery, forming a complete load circuit;

[0006] Among them, one end of the first voltage-dividing resistor, the second voltage-dividing resistor, ... and the Nth voltage-dividing resistor is externally connected to the source of the MOS tube and is grounded at the same time; the drain of the MOS tube is externally connected to an inductor and a relay, and then connected to the negative electrode of the security battery, that is, the negative electrode of the Nth battery; at the same time, the drain of the MOS tube is also externally connected to a power diode, and then connected to the positive electrode of the security battery. The battery circuit is activated by the relay. After the battery voltage is activated, the inspection circuit is connected through the MOS tube, and then the voltage on the voltage-dividing resistor and the detection resistor is detected to realize voltage detection on a single battery.

[0007] Furthermore, a protection capacitor is connected in parallel to both ends of the first voltage-dividing resistor, the second voltage-dividing resistor, ... and the Nth voltage-dividing resistor.

[0008] Furthermore, the power diode and the inductor are connected in parallel with each other and are connected to a first electrolytic capacitor.

[0009] Furthermore, a second electrolytic capacitor is connected in parallel between the source and drain of the MOS tube.

[0010] Furthermore, the first diode, the second diode, ... and the Nth diode are all directed toward the detection resistor, that is, the positive electrodes are connected to the positive electrode of the single battery.

[0011] Furthermore, data connections are derived from both ends of the diode and the detection resistor on the inspection circuit of each single battery, and are externally connected to the MCU to output the detected voltage data.

[0012] Furthermore, when the relay is turned on, the power supply voltage of the security battery turns on the MOS tube. At this time, the inspection circuit is turned on, the single battery circuit is turned on, and the current flows from the first diode to the first detection resistor, the first voltage divider resistor and the drain of the MOS tube. Since the MOS tube is turned on, the current flows to the inductor and the relay, and then flows to the negative electrode of the security battery, completing the conduction. At this time, the voltage across the first detection resistor and the first diode is detected, and the data is read to realize the voltage sampling of the first battery, completing the inspection detection. The voltage data of the second battery,... and the Nth battery can be read at the same time due to the same circuit, completing the overall single battery inspection task of the security battery.

[0013] Furthermore, when the relay is disconnected, the MOS tube is undervoltage and cannot be turned on, so the inspection circuit of each single battery cannot be turned on. The inspection circuits of two adjacent single batteries cannot be turned on because the directions of the diodes are both toward the detection resistor, and no leakage current is generated.

[0014] Compared with the prior art, the utility model provides a leakage-free single-cell battery inspection circuit, which uses a MOS tube to test the circuit of a single battery, so that a single battery of a security battery can be connected to the inspection circuit to complete voltage detection. At the same time, adding a diode in the circuit can prevent the inspection circuits of two adjacent single batteries from being turned on when the MOS tube and the relay are disconnected, thereby avoiding leakage when the inspection circuit is disconnected and reducing the current consumption on the detection resistor after the relay is disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a circuit diagram of the present utility model.

[0016] Where: E1. First battery, E2. Second battery, E3. Third battery, E4. Fourth battery, D1. First diode, D2. Second diode, D3. Third diode, D4. Fourth diode, R11. First detection resistor, R12. First voltage divider resistor, C1. First protection capacitor, R21. Second detection resistor, R22. Second voltage divider resistor, C2. Second protection capacitor, R31. Third detection resistor, R32. Third voltage divider resistor, C3. Third protection capacitor, R41. Fourth detection resistor, R42. Fourth voltage divider resistor, C4. Fourth protection capacitor, R51. Fifth detection resistor, R52. Fifth voltage divider resistor, C5. Fifth protection capacitor, RY. Relay, Q. MOS tube, L. Inductor, CD1. First electrolytic capacitor, CD2. Second electrolytic capacitor,

[0017] BAT1, BAT1-1, BAT2, BAT2-1, BAT3, BAT3-1, BAT4, BAT4-1, BAT5, and BAT5-1 are voltage data export interfaces. DETAILED DESCRIPTION

[0018] As shown in the figure, the security battery is composed of four single-cell batteries. In one embodiment, a non-leakage current single-cell battery inspection circuit includes four single-cell batteries, which are set as the first battery E1, the second battery E2, the third battery E3 and the fourth battery E4. The positive and negative poles of each adjacent single-cell battery are connected to each other; the positive and negative poles of each single-cell battery are connected to the inspection circuit outward; the positive pole of the first battery E1 is connected in series with a first diode D1, a first detection resistor R11 and a first voltage divider resistor R12, and then ... A second voltage-dividing resistor R22, a second detection resistor R21, and a second diode D2 are connected to the negative electrode of the first battery E1, and are also connected to the positive electrode of the adjacent second battery E2, and the circuit is stacked in sequence; finally, a fourth diode D4, a fourth detection resistor R41, and a fourth voltage-dividing resistor R42 are connected in series to the positive electrode of the fourth battery E4, and then a fifth voltage-dividing resistor R52, a fifth detection resistor R51, and a fifth diode D5 are connected in series to the negative electrode of the fourth battery E4, forming a complete load circuit;

[0019] One end of the first voltage-dividing resistor R12, the second voltage-dividing resistor R22, the third voltage-dividing resistor R32, the fourth voltage-dividing resistor R42, and the fifth voltage-dividing resistor R52 are externally connected to the source S of the MOS transistor Q and are also grounded; the drain D of the MOS transistor Q is externally connected to an inductor L and a relay RY, and then connected to the negative electrode of the security battery, that is, the negative electrode of the fourth battery E4; at the same time, the drain D of the MOS transistor Q is also externally connected to a power diode D, and then connected to the positive electrode of the security battery, that is, the positive electrode of the first battery E1. The battery circuit is activated by the relay RY. After the battery voltage is activated, the inspection circuit is connected through the MOS transistor Q, and then the voltages on the voltage-dividing resistor and the detection resistor are detected to achieve voltage detection on a single battery.

[0020] In one embodiment, each of the first, second, third, fourth, and fifth voltage-divider resistors R12, 22, 32, R42, and R52 is connected in parallel with a protection capacitor C1, C2, C3, C4, and C5. The power diode D and inductor L are connected in parallel and are connected to a first electrolytic capacitor CD1.

[0021] In one embodiment, a second electrolytic capacitor CD2 is connected in parallel between the source S and drain D of the MOS transistor Q. The first diode D1, the second diode D2, the third diode D3, the fourth diode D4, and the fifth diode D5 are all oriented toward the detection resistor, that is, their positive electrodes are connected to the positive electrode of the single battery cell.

[0022] In one embodiment, data connections are derived from both ends of the diode and the detection resistor on the inspection circuit of each single battery, and are externally connected to the MCU to output the detected voltage data.

[0023] In one embodiment, when the relay RY is turned on, the power supply voltage of the security battery turns on the MOS transistor Q. At this time, the inspection circuit is turned on, the single-cell battery circuit is turned on, and the current flows from the first diode D1 to the first detection resistor R11, the first voltage divider resistor R12, and the drain S of the MOS transistor Q. Since the MOS transistor Q is turned on, the current flows to the inductor L and the relay RY, and then to the negative electrode of the security battery, completing the conduction. At this time, the voltage across the first detection resistor R11 and the first diode D1 is detected, and the data is read to achieve voltage sampling of the first battery E1, completing the inspection. The voltage data of the second, third, and fourth batteries can be read simultaneously due to the same circuit, completing the single-cell inspection task of the entire security battery.

[0024] In one embodiment, when the relay RY is disconnected, the MOS tube Q is undervoltage and cannot be turned on, so the inspection circuit of each single battery cell cannot be turned on. The inspection circuits of two adjacent single batteries cannot be turned on because the directions of the diodes are both toward the detection resistor, and no leakage current is generated.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A single-cell battery inspection circuit with no leakage current, characterized in that: The invention comprises a plurality of single-cell batteries arranged as a first battery, a second battery, ..., an Nth battery, wherein the positive and negative electrodes of each adjacent single-cell battery are connected to each other; and an inspection circuit is externally connected to the positive and negative electrodes of each single-cell battery; The positive electrode of the first battery is connected in series with a first diode, a first detection resistor, and a first voltage-dividing resistor, and then connected in series with a second voltage-dividing resistor, a second detection resistor, and a second diode, and connected to the negative electrode of the first battery, and also connected to the positive electrode of the adjacent second battery, and the cycle is superimposed in sequence; finally, the positive electrode of the Nth battery is connected in series with an Nth diode, an Nth detection resistor, and an Nth voltage-dividing resistor, and then connected with an N+1th voltage-dividing resistor, an N+1th detection resistor, and an N+1th diode, and connected to the negative electrode of the Nth battery; Form a complete load circuit; Among them, one end of the first voltage-dividing resistor, the second voltage-dividing resistor, ... and the Nth voltage-dividing resistor is externally connected to the source of the MOS tube and is grounded at the same time; the drain of the MOS tube is externally connected to an inductor and a relay, and then connected to the negative electrode of the security battery, that is, the negative electrode of the Nth battery; at the same time, the drain of the MOS tube is also externally connected to a power diode, and then connected to the positive electrode of the security battery. The battery circuit is activated by the relay. After the battery voltage is activated, the inspection circuit is connected through the MOS tube, and then the voltage on the voltage-dividing resistor and the detection resistor is detected to realize voltage detection on a single battery.

2. A zero-leakage current single-cell battery inspection circuit according to claim 1, characterized in that: A protection capacitor is connected in parallel to both ends of the first voltage-dividing resistor, the second voltage-dividing resistor, ... and the Nth voltage-dividing resistor.

3. The zero-leakage current single-cell battery inspection circuit according to claim 1, characterized in that: The power diode and the inductor are connected in parallel with each other and are connected to a first electrolytic capacitor.

4. The zero-leakage current single-cell battery inspection circuit according to claim 1, characterized in that: A second electrolytic capacitor is connected in parallel between the source and drain of the MOS tube.

5. The zero-leakage current single-cell battery inspection circuit according to claim 1, characterized in that: The first diode, the second diode, ... and the Nth diode are all oriented toward the detection resistor, that is, the positive electrodes are connected to the positive electrode of the single battery.

6. The zero-leakage current single-cell battery inspection circuit according to claim 1, characterized in that: Data connections are derived from the diode and the two ends of the detection resistor on the inspection circuit of each single battery, and are both connected to the MCU to output the detected voltage data.

7. A zero-leakage current single-cell battery inspection circuit according to any one of claims 1 to 6, characterized in that: When the relay is turned on, the power supply voltage of the security battery turns on the MOS tube. At this time, the inspection circuit is turned on, the single battery circuit is turned on, and the current flows from the first diode to the first detection resistor, the first voltage divider resistor and the drain of the MOS tube. Since the MOS tube is turned on, the current flows to the inductor and the relay, and then flows to the negative electrode of the security battery, completing the conduction. At this time, the voltage across the first detection resistor and the first diode is detected, and the data is read to realize the voltage sampling of the first battery, completing the inspection detection. The voltage data of the second battery,... and the Nth battery can be read at the same time due to the same circuit, completing the single battery inspection task of the entire security battery.

8. A zero-leakage current single-cell battery inspection circuit according to any one of claims 1 to 6, characterized in that: When the relay is disconnected, the MOS tube is undervoltage and cannot be turned on, so the inspection circuit of each single battery cannot be turned on. The inspection circuits of two adjacent single batteries cannot be turned on because the directions of the diodes are both facing the detection resistor, and no leakage current is generated.

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