Electric two-wheeled vehicle lithium battery and its bms power control circuit

Abstract

The present disclosure provides an electric two-wheeled vehicle lithium battery and a BMS power control circuit thereof. The circuit comprises a power control sampling module and a BUCK voltage stabilizing module. The power control sampling module comprises a first electronic switch tube, a second electronic switch tube, a first resistor, a second resistor and at least two sampling diodes. The first end of the first electronic switch tube is connected with the first end of the first resistor. The control end of the second electronic switch tube is connected with the negative pole of each sampling diode. The BUCK voltage stabilizing module comprises a BUCK chip and an LDO voltage stabilizer. The enable end of the BUCK chip is connected with the first end of the first resistor. When each core component is powered off, the potential change of the control end of the second electronic switch tube input by the sampling diode makes the second electronic switch tube closed, so that the first electronic switch tube is also closed, and then the LDO voltage stabilizer stops working, thereby improving the reliability of the opening or closing of the battery power supply.

Description

Technical Field

[0001] This disclosure relates to the technical field, and in particular to a lithium battery for an electric two-wheeler and its BMS power control circuit. Background Technology

[0002] Currently, power control in lithium-ion battery management systems (BMS) for electric two-wheelers is mostly implemented using a single chip or a simple switching circuit. Typically, an external power source directly supplies power to the core components of the BMS, such as the MCU (Microcontroller Unit), AFE (Analog Front-End), and CAN transceiver, controlling the power supply's on / off state via a single enable signal. For example, some solutions control the power chip's operating state solely through the enable signal output by the MCU; when shutdown is required, the power supply is cut off using only this single signal.

[0003] However, a single enable signal control method, if the signal malfunctions (such as sticking or false triggering), may cause the power supply to fail to turn on or off properly, affecting the stability of the BMS system and even leading to safety hazards such as battery overcharging and over-discharging. Moreover, due to the lack of coordinated control of multiple signals, it is difficult to cope with complex operating conditions, such as battery undervoltage or overtemperature, and cannot quickly and reliably shut down the power supply, thus failing to ensure the safety of the battery and the vehicle. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an electric two-wheeler lithium battery and its BMS power control circuit that effectively improves the reliability of battery power on or off.

[0005] The purpose of this disclosure is achieved through the following technical solution: A power control circuit for a lithium battery BMS in an electric two-wheeler includes: a power control sampling module and a BUCK voltage regulator module; the power control sampling module includes a first electronic switch, a second electronic switch, a first resistor, a second resistor, and at least two sampling diodes; the second terminal of the first electronic switch is connected to the positive terminal of the lithium battery in the electric two-wheeler; the first terminal of the first electronic switch is connected to the first terminal of the first resistor; the second terminal of the first resistor is grounded; the second terminal of the first electronic switch is also connected to the first terminal of the second resistor; the second terminal of the second resistor is connected to the control terminal of the first electronic switch; the second electronic switch... One end of the second electronic switch is connected to the control terminal of the first electronic switch, the second end of the second electronic switch is grounded, the control terminal of the second electronic switch is connected to the negative terminal of each of the sampling diodes, and the positive terminal of each sampling diode is used to connect to the output terminal of a core component of the electric two-wheeled vehicle lithium battery BMS; the BUCK voltage regulator module includes a BUCK chip and an LDO voltage regulator, the enable terminal of the BUCK chip is connected to the first terminal of the first resistor, the output terminal of the BUCK chip is connected to the input terminal of the LDO voltage regulator, and the output terminal of the LDO voltage regulator is used to connect to the power supply terminal of at least one core component of the electric two-wheeled vehicle lithium battery BMS.

[0006] In one embodiment, the power control sampling module further includes a third resistor, the first end of which is connected to the first end of the first electronic switch, and the second end of which is connected to the first end of the first resistor.

[0007] In one embodiment, the third resistor is an adjustable resistor.

[0008] In one embodiment, the power control sampling module further includes a fourth resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is connected to the first terminal of the second electronic switch.

[0009] In one embodiment, the fourth resistor is an adjustable resistor.

[0010] In one embodiment, the power control sampling module further includes a fifth resistor, the first end of which is connected to the negative terminal of each of the sampling diodes, and the second end of which is connected to the control terminal of the second electronic switch.

[0011] In one embodiment, the power control sampling module further includes a sixth resistor, the first end of which is connected to the control terminal of the second electronic switch, and the second end of which is connected to the second terminal of the second electronic switch.

[0012] In one embodiment, the sixth resistor is an adjustable resistor.

[0013] In one embodiment, the BUCK voltage regulator module further includes a CAN transceiver, and the output terminal of the BUCK chip is connected to the power supply terminal of the CAN transceiver.

[0014] An electric two-wheeled vehicle lithium battery includes the electric two-wheeled vehicle lithium battery BMS power control circuit described in any of the above embodiments.

[0015] Compared with the prior art, this disclosure has at least the following advantages: When any core component of the electric two-wheeler's lithium battery BMS is operating normally, its output voltage is input to the control terminal of the second electronic switch via the corresponding sampling diode, causing the second electronic switch to conduct. This causes a change in the potential of the control terminal of the first electronic switch, which in turn conducts. At this time, the enable terminal of the BUCK chip receives the positive voltage of the electric two-wheeler's lithium battery, facilitating the activation of the BUCK chip and the output voltage to the LDO regulator. This allows the LDO regulator to supply power to the core components of the electric two-wheeler's lithium battery BMS, ensuring the normal operation of the electric two-wheeler's lithium battery BMS. When any core component of the electric two-wheeler's lithium battery BMS is powered off, a change in the potential of the control terminal of the second electronic switch via the sampling diode causes the second electronic switch to turn off, which in turn turns off the first electronic switch. This causes the LDO regulator to stop working, effectively disconnecting the power to the electric two-wheeler's lithium battery BMS and significantly improving the reliability of battery power on / off. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a circuit diagram of the power control circuit of the lithium battery BMS for an electric two-wheeled vehicle in one embodiment; Figure 2 This is a circuit diagram of a power control sampling module in one embodiment; Figure 3 This is a circuit diagram of the BUCK voltage regulator module in one embodiment. Detailed Implementation

[0018] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] This disclosure relates to a power control circuit for a lithium battery BMS in an electric two-wheeler. In one embodiment, the power control circuit includes a power control sampling module and a BUCK voltage regulator module; the power control sampling module includes a first electronic switch, a second electronic switch, a first resistor, a second resistor, and at least two sampling diodes. The second terminal of the first electronic switch is connected to the positive terminal of the electric two-wheeler lithium battery. The first terminal of the first electronic switch is connected to the first terminal of the first resistor, the second terminal of the first resistor is grounded, and the second terminal of the first electronic switch is also connected to the first terminal of the second resistor. The second terminal of the second resistor is connected to the control terminal of the first electronic switch. The first end of the switch tube is connected to the control terminal of the first electronic switch tube, the second end of the second electronic switch tube is grounded, the control terminal of the second electronic switch tube is connected to the negative terminal of each of the sampling diodes, and the positive terminal of each sampling diode is used to connect to the output terminal of a core component of the electric two-wheeled vehicle lithium battery BMS; the BUCK voltage regulator module includes a BUCK chip and an LDO voltage regulator, the enable terminal of the BUCK chip is connected to the first end of the first resistor, the output terminal of the BUCK chip is connected to the input terminal of the LDO voltage regulator, and the output terminal of the LDO voltage regulator is used to connect to the power supply terminal of at least one core component of the electric two-wheeled vehicle lithium battery BMS. When any core component of the electric two-wheeler's lithium battery BMS is operating normally, its output voltage is input to the control terminal of the second electronic switch via the corresponding sampling diode, causing the second electronic switch to conduct. This causes a change in the potential of the control terminal of the first electronic switch, which in turn conducts. At this time, the enable terminal of the BUCK chip receives the positive voltage of the electric two-wheeler's lithium battery, facilitating the activation of the BUCK chip and the output voltage to the LDO regulator. This allows the LDO regulator to supply power to the core components of the electric two-wheeler's lithium battery BMS, ensuring the normal operation of the electric two-wheeler's lithium battery BMS. When any core component of the electric two-wheeler's lithium battery BMS is powered off, a change in the potential of the control terminal of the second electronic switch via the sampling diode causes the second electronic switch to turn off, which in turn turns off the first electronic switch. This causes the LDO regulator to stop working, effectively disconnecting the power to the electric two-wheeler's lithium battery BMS and significantly improving the reliability of battery power on / off.

[0022] Please see Figure 1 This is a circuit diagram of a lithium battery BMS power control circuit for an electric two-wheeled vehicle according to an embodiment of the present disclosure.

[0023] One embodiment of the lithium battery BMS power control circuit 10 for an electric two-wheeled vehicle includes a power control sampling module 100 and a BUCK voltage regulator module 200. Please refer to both. Figure 2The power control sampling module 100 includes a first electronic switch Q1, a second electronic switch Q2, a first resistor R9, a second resistor R4, and at least two sampling diodes DZ. The second terminal of the first electronic switch Q1 is connected to the positive terminal B+ of the electric two-wheeled vehicle's lithium battery. The first terminal of the first electronic switch Q1 is connected to the first terminal of the first resistor R9, and the second terminal of the first resistor R9 is grounded. The second terminal of the first electronic switch Q1 is also connected to the first terminal of the second resistor R4, and the second terminal of the second resistor R4 is connected to the control terminal of the first electronic switch Q1. The first terminal of the second electronic switch Q2 is connected to the control terminal of the first electronic switch Q1, and the second terminal of the second electronic switch Q2 is grounded. The control terminal of the second electronic switch Q2 is connected to the negative terminal of each sampling diode DZ. The positive terminal of each sampling diode DZ is connected to the output terminal of a core component of the electric two-wheeled vehicle's lithium battery BMS. Please refer to [further details omitted]. Figure 3 The BUCK voltage regulator module 200 includes a BUCK chip U1 and an LDO voltage regulator U2. The enable terminal of the BUCK chip U1 is connected to the first terminal of the first resistor R9. The output terminal of the BUCK chip U1 is connected to the input terminal of the LDO voltage regulator U2. The output terminal of the LDO voltage regulator U2 is used to connect to the power supply terminal of at least one core component of the lithium battery BMS of the electric two-wheeled vehicle.

[0024] In this embodiment, when any core component of the electric two-wheeled vehicle lithium battery BMS is operating normally, its output voltage is input to the control terminal of the second electronic switch Q2 through the corresponding sampling diode DZ, causing the second electronic switch Q2 to conduct. This causes a change in the potential of the control terminal of the first electronic switch Q1, which in turn turns the first electronic switch Q1 on. At this time, the enable terminal of the BUCK chip U1 receives the positive B+ voltage of the electric two-wheeled vehicle lithium battery, facilitating the activation of the BUCK chip U1 and its output voltage to the LDO regulator U2. This allows the LDO regulator U2 to supply power to the core components of the electric two-wheeled vehicle lithium battery BMS, ensuring the normal operation of the electric two-wheeled vehicle lithium battery BMS. When the core components of the electric two-wheeled vehicle lithium battery BMS are powered off, the potential change of the control terminal of the second electronic switch Q2 is input through the sampling diode DZ, causing the second electronic switch Q2 to turn off. This causes the first electronic switch Q1 to also turn off, thereby stopping the LDO regulator U2 from working and achieving power disconnection for the electric two-wheeled vehicle lithium battery BMS, effectively improving the reliability of battery power on / off.

[0025] In another embodiment, the first electronic switch Q1 is a PNP transistor, with its first terminal being the collector of the PNP transistor, its second terminal being the emitter of the PNP transistor, and its control terminal being the base of the PNP transistor; the second electronic switch Q2 is an NPN transistor, with its first terminal being the collector of the NPN transistor, its second terminal being the emitter of the NPN transistor, and its control terminal being the base of the NPN transistor.

[0026] In one embodiment, please refer to Figure 2 The power control sampling module 100 further includes a third resistor R5. The first end of the third resistor R5 is connected to the first end of the first electronic switch Q1, and the second end of the third resistor R5 is connected to the first end of the first resistor R9. In this embodiment, the third resistor R5 is located between the first end of the first electronic switch Q1 and the first resistor R9, that is, the third resistor R5 is connected in series with the first end of the first electronic switch Q1, so that the third resistor R5 and the first resistor R9 form a voltage divider circuit, facilitating the voltage division of the positive B+ voltage of the electric two-wheeled vehicle lithium battery, thereby providing a safe enable voltage for the enable terminal of the BUCK chip U1.

[0027] Furthermore, the third resistor R5 is an adjustable resistor, and the resistance value of the third resistor R5 can be changed, so that the resistance ratio between the third resistor R5 and the first resistor R9 can be adjusted, thereby providing a corresponding enable voltage to the enable terminal of the BUCK chip U1, so as to use different BUCK chips U1.

[0028] In one embodiment, please refer to Figure 2 The power control sampling module 100 further includes a fourth resistor R6. The first end of the fourth resistor R6 is connected to the control terminal of the first electronic switch Q1, and the second end of the fourth resistor R6 is connected to the first terminal of the second electronic switch Q2. In this embodiment, the fourth resistor R6 is located between the control terminal of the first electronic switch Q1 and the first terminal of the second electronic switch Q2, that is, the fourth resistor R6 is connected in series with the first terminal of the second electronic switch Q2, so that the fourth resistor R6 and the second resistor R4 form a voltage divider circuit, which facilitates providing a stable control voltage to the control terminal of the first electronic switch Q1, thereby facilitating precise control of the on / off state of the first electronic switch Q1.

[0029] Furthermore, the fourth resistor R6 is an adjustable resistor, and the resistance value of the fourth resistor R6 can be changed. By adjusting the resistance value of the fourth resistor R6, it is convenient to adjust the voltage division ratio between the fourth resistor R6 and the second resistor R4, thereby facilitating the adjustment of the turn-on voltage of the first electronic switch Q1 to adapt to the first electronic switch Q1 with different turn-on voltages.

[0030] In one embodiment, please refer to Figure 2 The power control sampling module 100 further includes a fifth resistor R7. The first end of the fifth resistor R7 is connected to the negative terminal of each sampling diode DZ, and the second end of the fifth resistor R7 is connected to the control terminal of the second electronic switch Q2. In this embodiment, the fifth resistor R7 is located between the sampling diode DZ and the second electronic switch Q2. Specifically, the fifth resistor R7 is connected in series with the control terminal of the second electronic switch Q2. The fifth resistor R7 limits the current at the control terminal of the second electronic switch Q2 to avoid impact on the second electronic switch Q2 and ensure its normal operation.

[0031] In one embodiment, please refer to Figure 2 The power control sampling module 100 further includes a sixth resistor R8. The first end of the sixth resistor R8 is connected to the control terminal of the second electronic switch Q2, and the second end of the sixth resistor R8 is connected to the second terminal of the second electronic switch Q2. In this embodiment, the sixth resistor R8 is connected in parallel between the control terminal and the second terminal of the second electronic switch Q2. The sixth resistor R8 serves as a fast conduction path between the control terminal and the second terminal of the second electronic switch Q2 to improve the conduction rate of the second electronic switch Q2, thereby improving the response speed to battery power control.

[0032] In another embodiment, the sixth resistor R8 is an adjustable resistor with a variable resistance value. The sixth resistor R8 and the fifth resistor R7 form a voltage divider circuit. By adjusting the resistance value of the fifth resistor R7, a corresponding turn-on voltage can be provided to the second electronic switch Q2 to adapt to the second electronic switch Q2 with different turn-on voltages.

[0033] In one embodiment, please refer to Figure 3The BUCK voltage regulator module 200 also includes a CAN transceiver U3, and the output terminal of the BUCK chip U1 is connected to the power supply terminal of the CAN transceiver U3. In this embodiment, the CAN transceiver U3 serves as a CAN bus signal transceiver, and the voltage output by the BUCK chip U1 is used as the operating voltage of the CAN transceiver U3, facilitating the power supply of this core component, the CAN transceiver U3, in the electric two-wheeled vehicle lithium battery BMS.

[0034] In another embodiment, the BUCK chip U1 outputs a voltage of 5V, and the LDO regulator U2 steps down the 5V voltage to 3.3V to power other core components. For example, the core components of the lithium battery BMS for electric two-wheeled vehicles also include MCU and AFE.

[0035] In one embodiment, this disclosure also provides a lithium battery for an electric two-wheeler, including the electric two-wheeler lithium battery BMS power control circuit described in any of the above embodiments. In this embodiment, the electric two-wheeler lithium battery BMS power control circuit includes a power control sampling module and a BUCK voltage regulator module; the power control sampling module includes a first electronic switch, a second electronic switch, a first resistor, a second resistor, and at least two sampling diodes. The second terminal of the first electronic switch is connected to the positive terminal of the electric two-wheeler lithium battery, the first terminal of the first electronic switch is connected to the first terminal of the first resistor, the second terminal of the first resistor is grounded, the second terminal of the first electronic switch is also connected to the first terminal of the second resistor, and the second terminal of the second resistor is connected to the control terminal of the first electronic switch; the second electronic switch... The first end of the tube is connected to the control terminal of the first electronic switch tube, the second end of the second electronic switch tube is grounded, the control terminal of the second electronic switch tube is connected to the negative terminal of each of the sampling diodes, and the positive terminal of each sampling diode is used to connect to the output terminal of a core component of the electric two-wheeled vehicle lithium battery BMS; the BUCK voltage regulator module includes a BUCK chip and an LDO voltage regulator, the enable terminal of the BUCK chip is connected to the first end of the first resistor, the output terminal of the BUCK chip is connected to the input terminal of the LDO voltage regulator, and the output terminal of the LDO voltage regulator is used to connect to the power supply terminal of at least one core component of the electric two-wheeled vehicle lithium battery BMS. When any core component of the electric two-wheeler's lithium battery BMS is operating normally, its output voltage is input to the control terminal of the second electronic switch via the corresponding sampling diode, causing the second electronic switch to conduct. This causes a change in the potential of the control terminal of the first electronic switch, which in turn conducts. At this time, the enable terminal of the BUCK chip receives the positive voltage of the electric two-wheeler's lithium battery, facilitating the activation of the BUCK chip and the output voltage to the LDO regulator. This allows the LDO regulator to supply power to the core components of the electric two-wheeler's lithium battery BMS, ensuring the normal operation of the electric two-wheeler's lithium battery BMS. When any core component of the electric two-wheeler's lithium battery BMS is powered off, a change in the potential of the control terminal of the second electronic switch via the sampling diode causes the second electronic switch to turn off, which in turn turns off the first electronic switch. This causes the LDO regulator to stop working, effectively disconnecting the power to the electric two-wheeler's lithium battery BMS and significantly improving the reliability of battery power on / off.

[0036] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent disclosure should be determined by the appended claims.

Claims

1. A lithium battery BMS power control circuit for an electric two-wheeled vehicle, characterized in that, include: A power control sampling module includes a first electronic switch, a second electronic switch, a first resistor, a second resistor, and at least two sampling diodes. The first terminal of the first electronic switch is connected to the first terminal of the first resistor, and the second terminal of the first electronic switch is connected to the positive terminal of the electric two-wheeled vehicle's lithium battery. The second terminal of the first resistor is grounded, and the second terminal of the first electronic switch is also connected to the first terminal of the second resistor. The second terminal of the second resistor is connected to the control terminal of the first electronic switch. The first terminal of the second electronic switch is also connected to the control terminal of the first electronic switch, and the second terminal of the second electronic switch is grounded. The control terminal of the second electronic switch is connected to the negative terminal of each sampling diode. The positive terminal of each sampling diode is connected to the output terminal of a core component of the electric two-wheeled vehicle's lithium battery BMS. The BUCK voltage regulator module includes a BUCK chip and an LDO voltage regulator. The enable terminal of the BUCK chip is connected to the first terminal of the first resistor, and the output terminal of the BUCK chip is connected to the input terminal of the LDO voltage regulator. The output terminal of the LDO voltage regulator is used to connect to the power supply terminal of at least one core component of the lithium battery BMS of the electric two-wheeled vehicle.

2. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 1, characterized in that, The power control sampling module further includes a third resistor, the first end of which is connected to the first end of the first electronic switch tube, and the second end of which is connected to the first end of the first resistor.

3. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 2, characterized in that, The third resistor is an adjustable resistor.

4. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 1, characterized in that, The power control sampling module further includes a fourth resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is connected to the first end of the second electronic switch.

5. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 4, characterized in that, The fourth resistor is an adjustable resistor.

6. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 1, characterized in that, The power control sampling module further includes a fifth resistor, the first end of which is connected to the negative terminal of each of the sampling diodes, and the second end of which is connected to the control terminal of the second electronic switch.

7. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 1, characterized in that, The power control sampling module further includes a sixth resistor, the first end of which is connected to the control terminal of the second electronic switch, and the second end of which is connected to the second terminal of the second electronic switch.

8. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 7, characterized in that, The sixth resistor is an adjustable resistor.

9. The electric two-wheeled vehicle lithium battery BMS power control circuit according to claim 1, characterized in that, The BUCK voltage regulator module also includes a CAN transceiver, and the output terminal of the BUCK chip is connected to the power supply terminal of the CAN transceiver.

10. A lithium battery for an electric two-wheeler, comprising a power control circuit (BMS) for an electric two-wheeler lithium battery as described in any one of claims 1 to 9.

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