Battery electric quantity metering system of electric bicycle and electric bicycle

Abstract

The utility model provides a battery electric quantity metering system of an electric bicycle and the electric bicycle. The system comprises a voltameter module, an electric bicycle controller, a Bluetooth / 4G central controller and a battery pack. The voltameter module and the electric bicycle controller are respectively connected with the Bluetooth / 4G central controller, and the battery pack is connected with the voltameter module; the voltameter module is used for collecting the temperature, the first voltage and the charging and discharging current of the battery pack, and calculating the SOC of the battery according to the temperature, the first voltage and the charging and discharging current; the electric bicycle controller is used for acquiring the rotating speed, current and second voltage of the electric bicycle; the Bluetooth / 4G central controller is used for calculating the health state of the battery according to the temperature, the first voltage, the charging and discharging current, the SOC of the battery, the rotating speed, the current and the second voltage; the endurance mileage is calculated according to the health state of the battery; the accuracy of endurance mileage calculation can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric bicycle control technical field especially electric bicycle's battery power metering system and electric bicycle. BACKGROUND

[0002] Lead-acid battery provides power energy for electric bicycle, and the accurate power display, the health state of battery and the abnormal protection of battery temperature are more and more demanded by consumers.

[0003] At present, the method for calculating battery power mainly includes open-circuit voltage method and ampere-hour integration method. The open-circuit voltage method estimates the state of charge (SOC) of the battery by collecting the battery voltage. However, due to the influence of battery brand, battery capacity, temperature and charging and discharging current, the battery voltage fluctuates greatly, which may cause inaccurate calculation of the state of charge of the battery.

[0004] The ampere-hour integration method mainly uses TI's bq34z100-G1 chip to collect battery parameters and calculates the capacity of the battery by using ampere-hour integration method. However, the chip only supports lithium battery cells, and is not suitable for lead-acid batteries with stable charging and discharging voltage and current. The capacity of the battery, aging compensation and self-discharge compensation of the chip are fixed. With the aging of the battery, the deviation of the battery capacity and SOC will become larger and larger. SUMMARY

[0005] Therefore, the purpose of the utility model is to provide a battery power metering system for electric bicycle and electric bicycle, which can improve the accuracy of the calculation of the cruising range.

[0006] In the first aspect, the utility model embodiment provides a battery power metering system for electric bicycle, which comprises a power meter module, an electric bicycle controller, a Bluetooth / 4G central controller and a battery pack.

[0007] The power meter module and the electric bicycle controller are connected to the Bluetooth / 4G central controller, and the battery pack is connected to the power meter module.

[0008] The power meter module is used to collect the temperature, the first voltage and the charging and discharging current of the battery pack, and calculate the SOC of the battery according to the temperature, the first voltage and the charging and discharging current.

[0009] The electric bicycle controller is used to obtain the rotating speed, the current and the second voltage of the electric bicycle.

[0010] The Bluetooth / 4G central control receives the temperature, the first voltage, the charging and discharging current and the SOC of the battery sent by the battery gauge module, receives the rotating speed, the current and the second voltage sent by the electric bicycle controller, calculates the health status of the battery according to the temperature, the first voltage, the charging and discharging current, the SOC of the battery, the rotating speed, the current and the second voltage, and calculates the endurance mileage according to the health status of the battery.

[0011] Further, the battery gauge module comprises a power supply circuit, and the power supply circuit comprises a switching power supply step-down chip and a low-dropout linear step-down chip.

[0012] The switching power supply step-down chip is configured to convert the battery power supply into a third voltage.

[0013] The low-dropout linear step-down chip is configured to convert the third voltage into a fourth voltage and supply the fourth voltage to a master control chip in the battery gauge module.

[0014] Further, the battery gauge module comprises a bidirectional one-wire communication circuit.

[0015] The bidirectional one-wire communication circuit is configured to receive the battery parameter information sent by the Bluetooth / 4G central control and send the temperature, the first voltage, the charging and discharging current and the SOC of the battery to the Bluetooth / 4G central control.

[0016] Further, the battery gauge module comprises a voltage selection line circuit, and the voltage selection line circuit comprises a voltage selection interface.

[0017] When the voltage selection interface is in a floating state, the master control chip in the battery gauge module determines the battery voltage as a preset voltage.

[0018] When the voltage selection interface is in a pulled-down state, the master control chip in the battery gauge module identifies the size of the battery voltage.

[0019] Further, the battery gauge module comprises a fuse thermal fuse control circuit.

[0020] The fuse thermal fuse control circuit is configured to, when the master control chip in the battery gauge module detects a battery fault, control a triode Q9 to make a thermal fuse cut off the battery pack and stop supplying power to the whole vehicle.

[0021] Further, the battery gauge module comprises a communication interface circuit, and the communication interface circuit comprises a first communication connection terminal, a second communication connection terminal, a first sampling resistor and a second sampling resistor, wherein the master control chip in the battery gauge module collects the current between the first sampling resistor and the second sampling resistor.

[0022] Further, the power gauge module comprises a charger insertion detection circuit, and the charger insertion detection circuit comprises a charging detection interface;

[0023] The charger insertion detection circuit is used for pulling down the charging detection interface when the charger is inserted into the battery pack, and the master control chip in the power gauge module identifies that the battery pack is in a charging mode.

[0024] Further, the power gauge module comprises a charging switch control circuit and a charger communication circuit;

[0025] The charger communication circuit is used for sending charging information to the master control chip in the power gauge module, so that the master control chip pulls up the Mosfet switch in the charging switch control circuit and opens the Q2 charging when the charger is matched according to the charging information.

[0026] Further, the master control chip is used for pulling down the Mosfet switch in the charging switch control circuit and exiting charging when the charging is completed.

[0027] In a second aspect, the utility model embodiment provides an electric bicycle, comprising the battery power gauge system of electric bicycle as described above.

[0028] The utility model embodiment provides electric bicycle's battery power gauge system and electric bicycle, system includes power gauge module, electric bicycle controller, bluetooth / 4G central control and battery pack, power gauge module and electric bicycle controller are connected with bluetooth / 4G central control respectively, and battery pack is connected with power gauge module, power gauge module is used to gather the temperature, first voltage and charge-discharge current of battery pack, and the SOC of battery is calculated according to temperature, first voltage and charge-discharge current, electric bicycle controller is used to obtain the rotating speed, current and second voltage of electric bicycle, bluetooth / 4G central control is used to receive the temperature, first voltage, charge-discharge current and SOC of battery that power gauge module sends, and receive the rotating speed, current and second voltage that electric bicycle controller sends, and the health state of battery is calculated according to temperature, first voltage, charge-discharge current, SOC of battery, rotating speed, current and second voltage, and the endurance mileage is calculated according to the health state of battery, can improve the accuracy of endurance mileage calculation.

[0029] Other features and advantages of the present application will be further illustrated in the following description, and some of them will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. The purposes and other advantages of the present application are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0030] In order to make the above object, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are taken, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to make the above object, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are taken, and the accompanying drawings are described in detail as follows.

[0032] Figure 1 The battery power metering system schematic view of the electric bicycle is provided for the utility model embodiment one;

[0033] Figure 2 The power supply circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0034] Figure 3 The main control chip structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0035] Figure 4 The bidirectional one-wire circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0036] Figure 5 The voltage selection line circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0037] Figure 6 The fuse thermal breaking control circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0038] Figure 7 The communication interface circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0039] Figure 8 The charger insertion detection circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0040] Figure 9 The charging switch control negative circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one;

[0041] Figure 10 The charger communication circuit structure schematic view of the electric power meter module is provided for the utility model embodiment one. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the utility model will be described clearly and completely in combination with the drawings below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0043] In order to facilitate the understanding of the present embodiment, the embodiments of the utility model will be described in detail below.

[0044] Embodiment one:

[0045] Figure 1 The battery power metering system schematic diagram of the electric bicycle provided by the embodiment of the utility model.

[0046] Referring to Figure 1 The system comprises a power meter module, an electric bicycle controller, a Bluetooth / 4G central control and a battery pack. The charger communicates with the power meter module and charges the battery pack.

[0047] The power meter module and the electric bicycle controller are connected with the Bluetooth / 4G central control respectively, and the battery pack is connected with the power meter module.

[0048] The power meter module is used for collecting the temperature, the first voltage and the charge-discharge current of the battery pack, and calculating the SOC of the battery according to the temperature, the first voltage and the charge-discharge current.

[0049] The electric bicycle controller is used for obtaining the rotating speed, the current and the second voltage of the electric bicycle.

[0050] The Bluetooth / 4G central control is used for receiving the temperature, the first voltage, the charge-discharge current and the SOC of the battery sent by the power meter module, and receiving the rotating speed, the current and the second voltage sent by the electric bicycle controller. The Bluetooth / 4G central control is used for calculating the health state (SOH) of the battery according to the temperature, the first voltage, the charge-discharge current, the SOC of the battery, the rotating speed, the current and the second voltage, and calculating the cruising range according to the health state of the battery.

[0051] The power meter module can also judge whether the charger is matched or not. If not, the charger is cut off. When the battery is over-temperature or over-current, the battery pack is cut off, and the external power supply is not provided. Therefore, the power meter module can detect whether the battery works abnormally or not, and cut off the discharge to the outside.

[0052] Further, referring to Figure 2 The power meter module comprises a power supply circuit, and the power supply circuit comprises a switching power supply step-down chip and a low-dropout linear step-down chip.

[0053] The switch power supply step-down chip is used for converting the battery power supply into a third voltage;

[0054] The low-voltage difference linear step-down chip is used for converting the third voltage into a fourth voltage and supplying the fourth voltage to a master control chip in the power gauge module. The third voltage is DC 12V, and the fourth voltage is DC 5V.

[0055] Referring to Figure 3 , U4 is a master control chip ES32L0920NF of the power gauge module. The chip is an ARM 32-bit MCU, has 2-way high-precision 16-bit ADC, AIN3 collects the battery voltage, AIN2 collects the battery temperature, AIN1P and AIN1N collect the bus current of the battery charging and discharging. The chip has 64KB of flash, 4KB of SRAM and 10 general-purpose IOs.

[0056] Further, referring to Figure 4 , the power gauge module comprises a bidirectional one-wire communication circuit.

[0057] The bidirectional one-wire communication circuit is used for receiving the battery parameter information sent by the Bluetooth / 4G central control and sending the temperature, the first voltage, the charging and discharging current and the SOC of the battery to the Bluetooth / 4G central control.

[0058] Specifically, the bidirectional one-wire communication circuit comprises a triode Q7 and a triode Q8. The bidirectional one-wire communication circuit communicates with the Bluetooth / 4G central control. The Bluetooth / 4G central control can send some battery parameters to the U4 at irregular intervals. The U4 sends the calculated SOC, temperature, first voltage, charging and discharging current and other information to the Bluetooth / 4G central control.

[0059] Further, referring to Figure 5 , the power gauge module comprises a voltage selection line circuit, and the voltage selection line circuit comprises a voltage selection interface.

[0060] When the voltage selection interface MET is in a floating state, the master control chip in the power gauge module determines that the battery voltage is a preset voltage.

[0061] When the voltage selection interface MET is in a pulled-down state, the master control chip in the power gauge module identifies the size of the battery voltage.

[0062] Specifically, when the voltage selection interface MET is in a floating state, the U4 considers it to be low, and the default battery is 5 groups / 60V. When the voltage selection interface MET is in a pulled-down state, the U4 considers it to be high, and the U4 simultaneously identifies the battery voltage to determine whether it is a 4-group / 48V battery or a 6-group / 72V battery.

[0063] Further, referring to Figure 6 , the power gauge module comprises a fuse thermal fuse control circuit.

[0064] Fuse thermal breaking control circuit, for when the master control chip in the battery power meter module detects battery failure, control the transistor Q9 (Q9 will pull low, short thermal fuse), so that the thermal fuse cut off the battery pack, stop the vehicle power supply.

[0065] Further, referring to Figure 7 , the battery power meter module includes a communication interface circuit, the communication interface circuit includes a first communication connection terminal J1, a second communication connection terminal J2, a first sampling resistor RS1 and a second sampling resistor RS2; wherein, the master control chip in the battery power meter module collects the current between the first sampling resistor and the second sampling resistor.

[0066] Specifically, J2 connects the battery negative and the load common negative, through the sampling resistor RS1 / RS2 sampling resistor, U4 collects the current between RS1 and RS2.

[0067] Further, referring to Figure 8 , the battery power meter module includes a charger insertion detection circuit, the charger insertion detection circuit includes a charging detection interface CHG_DET and a transistor Q5;

[0068] The charger insertion detection circuit, for when the charger is inserted into the battery pack, the charging detection interface CHG_DET is pulled low (U4 is detected as high), the master control chip in the battery power meter module identifies that the battery pack is in charging mode.

[0069] Further, referring to Figure 9 and Figure 10 , the battery power meter module includes a charging switch control negative circuit and a charger communication circuit;

[0070] The charger communication circuit is used to send charging information to the master control chip in the battery power meter module, so that the master control chip can pull up the Mosfet switch in the charging switch control negative circuit according to the charging information when the charger is matched, and turn on Q2 charging.

[0071] Further, the master control chip is used to pull down the Mosfet switch in the charging switch control negative circuit when the charging is completed, and exit the charging.

[0072] Specifically, the charger sends charging information to U4 through U3. When U4 identifies the matched charger, it pulls up the Mosfet switch (POWER_key) and turns on Q2 to start charging.

[0073] The charger will send current, voltage information and charging state to U4, and U4 will pull down the Mosfet switch (POWER_key) and exit the charging when the charging is completed. The battery power meter module communicates with the charger to control the charging Mosfet switch, preventing overvoltage and overcurrent from being mismatched, so as to achieve the purpose of protecting the battery pack.

[0074] By controlling Q2 to open or close, risks such as charging by a wrong charger, overcharging and short circuit can be prevented.

[0075] The utility model embodiment provides electric bicycle, including the battery power metering system of electric bicycle as described above.

[0076] The utility model embodiment provides electric bicycle's battery power metering system and electric bicycle, system includes power meter module, electric bicycle controller, bluetooth / 4G central control and battery group, power meter module and electric bicycle controller are connected with bluetooth / 4G central control respectively, and battery group is connected with power meter module, power meter module is used to gather the temperature, first voltage and charge-discharge current of battery group, and the SOC of battery is calculated according to temperature, first voltage and charge-discharge current, electric bicycle controller is used to obtain the speed, current and second voltage of electric bicycle, bluetooth / 4G central control is used to receive the temperature, first voltage, charge-discharge current and the SOC of battery that power meter module sends, and receive the speed, current and second voltage that electric bicycle controller sends, and the health state of battery is calculated according to temperature, first voltage, charge-discharge current, the SOC of battery, speed, current and second voltage, and the endurance mileage is calculated according to the health state of battery, can improve the accuracy of endurance mileage calculation.

[0077] The computer program product provided in the embodiment of the utility model comprises a computer readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the method described in the foregoing method embodiment.

[0078] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0079] In addition, in the description of the embodiment of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected, can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0080] If the functions are realized in the form of software function units and sold or used as independent products, the functions can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0081] In the description of the present application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0082] Finally, it should be pointed out that: the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit them, the protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art within the technical range disclosed by the present application can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery power gauge system for an electric bicycle, characterized by, The system comprises a power meter module, an electric bicycle controller, a Bluetooth / 4G central controller and a battery pack; The power meter module and the electric bicycle controller are connected with the Bluetooth / 4G central controller respectively, and the battery pack is connected with the power meter module; The power meter module is used for collecting the temperature, the first voltage and the charging and discharging current of the battery pack, and calculating the SOC of the battery according to the temperature, the first voltage and the charging and discharging current; The electric bicycle controller is used for acquiring the rotating speed, the current and the second voltage of the electric bicycle; The Bluetooth / 4G central controller is used for receiving the temperature, the first voltage, the charging and discharging current and the SOC of the battery sent by the power meter module, and receiving the rotating speed, the current and the second voltage sent by the electric bicycle controller; The health status of the battery is calculated according to the temperature, the first voltage, the charging and discharging current, the SOC of the battery, the rotating speed, the current and the second voltage; And the endurance mileage is calculated according to the health status of the battery.

2. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a power supply circuit, and the power supply circuit comprises a switching power supply step-down chip and a low-dropout linear step-down chip; The switching power supply step-down chip is used for converting the battery power supply into a third voltage; The low-dropout linear step-down chip is used for converting the third voltage into a fourth voltage, and supplying the fourth voltage to a master control chip in the power meter module.

3. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a bidirectional one-wire communication circuit; The bidirectional one-wire communication circuit is used for receiving the battery parameter information sent by the Bluetooth / 4G central controller, and sending the temperature, the first voltage, the charging and discharging current and the SOC of the battery to the Bluetooth / 4G central controller.

4. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a voltage selection line circuit, and the voltage selection line circuit comprises a voltage selection interface; When the voltage selection interface is in a floating state, the master control chip in the power meter module determines the battery voltage as a preset voltage; When the voltage selection interface is in a pulled-down state, the master control chip in the power meter module identifies the size of the battery voltage.

5. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a fuse thermal fuse control circuit; The fuse thermal fuse control circuit is used for controlling a triode Q9 to make a thermal fuse cut off the battery pack and stop supplying power to the whole vehicle when the master control chip in the power meter module detects a battery fault.

6. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a communication interface circuit, and the communication interface circuit comprises a first communication connection terminal, a second communication connection terminal, a first sampling resistor and a second sampling resistor; wherein the master control chip in the power meter module collects the current between the first sampling resistor and the second sampling resistor.

7. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a charger insertion detection circuit, and the charger insertion detection circuit comprises a charging detection interface; The charger insertion detection circuit is used for pulling down the charging detection interface when a charger is inserted into the battery pack, and the master control chip in the power meter module identifies that the battery pack is in a charging mode.

8. The battery power gauge system for an electric bicycle of claim 1, wherein, The power meter module comprises a charging switch control negative circuit and a charger communication circuit; The charger communication circuit is used for sending charging information to the master control chip in the power meter module, so that the master control chip pulls up the Mosfet switch in the charging switch control negative circuit and opens Q2 charging when the charger is matched according to the charging information.

9. The battery power gauge system for an electric bicycle of claim 8, wherein, The master control chip is used for pulling down the Mosfet switch in the charging switch control negative circuit and exiting charging when the charging is completed.

10. An electric bicycle, characterized by The battery power metering system of the electric bicycle comprises the battery power metering system of the electric bicycle.

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