Electric bicycle power supply device and electric bicycle

Abstract

The utility model discloses an electric bicycle power supply device and an electric bicycle. The device comprises a battery, a sampling unit and a controller, the battery is provided with a first cathode interface, a second cathode interface and an anode interface; the negative electrode of the battery is connected with the sampling unit through the first negative electrode interface; the second negative electrode interface and the positive electrode interface are connected with a charger; the controller is used for acquiring sampling data of the sampling unit and determining the remaining capacity of the battery according to the sampling data.

Description

TECHNICAL FIELD

[0001] The utility model discloses an electric bicycle power supply device and electric car, and relates to the technical field of electric bicycles. BACKGROUND

[0002] As a convenient means of transport, the performance and function of the power supply device of the electric bicycle are crucial to user experience. At present, the electric bicycle battery still has some deficiencies in electric quantity monitoring, charging management and cooperative work with other components. The controller does not participate in the acquisition of charging data, and cannot realize accurate calculation of the electric quantity through an algorithm. The electric quantity display of the instrument only relies on the current battery voltage value, and the display is inaccurate due to the characteristics of the lead-acid battery, and there is a large fluctuation, so that the user cannot clearly understand the actual electric quantity and cannot control the remaining mileage. SUMMARY

[0003] The utility model provides a kind of electric bicycle power supply device and electric car, to reach the purpose of solving the defects in prior art.

[0004] In a first aspect, the utility model embodiment provides a kind of electric bicycle power supply device, comprising: battery, sampling unit and controller;

[0005] The battery is configured with first negative pole interface, second negative pole interface, positive pole interface;

[0006] The negative pole of the battery is connected with the sampling unit by the first negative pole interface, and the second negative pole interface and the positive pole interface are used to be connected with charger;

[0007] The controller is used to obtain the sampling data of the sampling unit, and determines the residual electric quantity of the battery according to the sampling data.

[0008] Optionally, the sampling unit is used for current sampling.

[0009] Optionally, the sampling unit includes: differential sampling circuit and sampling chip;

[0010] The first negative pole interface is connected with the sampling chip by the differential sampling circuit, and the sampling chip is also connected with the controller.

[0011] Optionally, the differential sampling circuit includes:

[0012] First resistance, second resistance, third resistance, fourth resistance, fifth resistance, sixth resistance, seventh resistance, capacitor;

[0013] The first negative pole interface is connected with the first input end of the sampling chip by the first resistance, and is grounded by the first resistance, second resistance, third resistance and capacitor.

[0014] The fourth resistor is connected in parallel with the second resistor;

[0015] The reference power supply end is connected to ground through the fifth resistor and the sixth resistor, and the connection point of the fifth resistor and the sixth resistor is connected to the second input end of the sampling chip;

[0016] The seventh resistor is connected in parallel with the sixth resistor;

[0017] The output end of the sampling chip is connected to the control chip.

[0018] Optionally, the power supply device further comprises an instrument, and the controller is connected to the instrument;

[0019] The instrument is used for displaying the residual power determined by the controller.

[0020] Optionally, the controller is connected to the instrument through a wire.

[0021] Optionally, the sampling unit is arranged in the controller.

[0022] Optionally, the controller is configured to determine the residual power by using the ampere-hour integration method.

[0023] Optionally, the battery is a lead-acid battery.

[0024] In the second aspect, the utility model embodiment further provides an electric vehicle, which comprises any one of the electric bicycle power supply devices provided by the utility model embodiment.

[0025] Compared with the prior art, the utility model has the beneficial effects that: the utility model provides an electric bicycle power supply device, a first negative electrode interface is arranged for the battery to connect a sampling unit, and a second negative electrode interface and a positive electrode interface are arranged to connect a charger, so that the charging and the power monitoring function are separated on the circuit connection. In this way, the charging process can avoid interfering with the power monitoring circuit, the accuracy of the sampling data is ensured, the residual power of the battery is determined more reliably, and the structure of the power supply device provides convenience for subsequent possible upgrades or compatibility with other devices. For example, if different types of sampling units are needed to be replaced to improve the sampling accuracy, or new battery management functions are needed to be added, the structure of separating the battery, the sampling unit and the controller is easier to improve without causing great damage to the overall charging and power monitoring function. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the structure block diagram of the electric bicycle power supply device in the embodiment;

[0027] Figure 2is a differential sampling circuit schematic diagram in the embodiment;

[0028] Figure 3 is a sampling chip and pin diagram in the embodiment. DETAILED DESCRIPTION

[0029] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0030] Embodiment one

[0031] Figure 1 is an electric bicycle power supply device structure block diagram in the embodiment, reference Figure 1 , the device includes: battery 100, sampling unit 200 and controller 300;

[0032] Battery 100 is configured with first negative pole interface N2, second negative pole interface N1, positive pole interface P;

[0033] The negative pole of battery 100 is connected with sampling unit 200 through first negative pole interface N2, and second negative pole interface N1 and positive pole interface P are used to be connected with charger 1;

[0034] Controller 300 is used to obtain the sampling data of sampling unit 200, and the residual capacity of battery 100 is determined according to the sampling data.

[0035] Exemplarily, in the scheme, first negative pole interface N2 and positive pole interface P are set as the discharge interface of battery 100, and second negative pole interface N1 and positive pole interface P are set as the charging interface of battery 100.

[0036] Exemplarily, in the scheme, sampling unit 200 can be specifically configured to collect the current or voltage of battery 100.

[0037] Exemplarily, in the scheme, sampling unit 200 can include a shunt, and the shunt is a small resistance, which is connected in series in the loop of the battery. According to Ohm's law, when the current passes through the shunt, a voltage drop proportional to the current size will be generated at both ends of the shunt. By measuring this voltage drop, combined with the known resistance value of the shunt, the current size passing through the shunt can be calculated, so as to obtain the current of the battery;

[0038] Alternatively, the sampling unit 200 can include a Hall effect sensor, based on the Hall effect, when a current passes through a semiconductor wafer, if a magnetic field is applied in the vertical direction of the wafer, then on the other two sides of the wafer will generate a voltage proportional to the current and the magnetic field strength, this voltage is called the Hall voltage, and then measure the current according to the voltage;

[0039] Specifically, the Hall sensor is placed near the current loop of the battery, and when the current passes through, the sensor will generate a corresponding Hall voltage, and the size of the current can be obtained by measuring this voltage.

[0040] For example, the method for calculating the remaining power in the controller 300 is not limited in this scheme, which can be set as needed according to the sampling signal of the sampling unit 200, and the improvement of the software method is not involved in this application. The method used in the controller 300 is the same as the prior art.

[0041] The embodiment provides an electric bicycle power supply device, by setting a first negative electrode interface for connecting the sampling unit for the battery, and a second negative electrode interface and a positive electrode interface for connecting the charger, the separation of the charging and power monitoring functions in the circuit connection is realized. This can avoid the interference of the charging process on the power monitoring circuit, ensure the accuracy of the sampling data, and more reliably determine the remaining power of the battery. The structure of the power supply device provides convenience for subsequent possible upgrades or compatibility with other equipment. For example, if different types of sampling units are needed to improve sampling accuracy, or new battery management functions are added, the structure of separating the battery, the sampling unit and the controller is easier to improve, and will not cause great damage to the overall charging and power monitoring function.

[0042] In Figure 1 Based on the scheme shown, in an implementable scheme, the sampling unit is configured for current sampling.

[0043] For example, in this scheme, a current sampling chip can be used for current sampling of the battery, and the type of the current sampling chip can be determined according to requirements.

[0044] Based on the scheme in which the sampling unit is used for current sampling, in an implementable scheme, the sampling unit includes a differential sampling circuit and a sampling chip.

[0045] The first negative electrode interface is connected to the sampling chip through the differential sampling circuit, and the sampling chip is also connected to the controller.

[0046] Exemplarily, in the present scheme, the differential sampling circuit and the sampling chip are used to realize the current sampling of the battery. The differential current sampling sets the differential sampling circuit in the battery charging and discharging loop, and the two input ends of the sampling chip are connected to the two ends of the sampling resistor respectively to extract the voltage difference signal. Since the differential circuit can effectively amplify the voltage difference signal and suppress the influence of common mode interference signals such as power supply noise and ground potential fluctuation on the measurement. Finally, the sampling chip outputs the amplified differential mode signal to the subsequent processing circuit such as the controller for digital processing and analysis.

[0047] The current sampling chip usually integrates high-precision amplifiers, comparators, analog-to-digital converters and other circuit elements inside. The basic principle is to convert the battery current into a voltage signal through a sampling resistor, then input this voltage signal to the amplifier inside the chip for amplification and conditioning, then convert the analog voltage signal into a digital signal through the analog-to-digital converter, and finally process and analyze the digital signal by the logic circuit inside the chip to get the current value of the battery.

[0048] The current sampling chip integrates multiple circuit elements inside a chip, greatly reducing the complexity of external circuits and the space occupation of the circuit board, improving the integration and reliability of the system, and also reducing the cost and power consumption of the system.

[0049] The current sampling chip usually has high measurement precision and resolution, which can accurately measure the small current change of the battery and provide accurate current information for the battery management system, so as to realize more accurate battery state monitoring and management.

[0050] The amplifier and analog-to-digital converter and other circuits inside the chip are carefully designed and calibrated, with good linearity, which can maintain the consistency of measurement precision in a wide current range, ensuring the accuracy of current sampling.

[0051] The current sampling chip usually has a simple external interface and configuration method. Users only need to connect and configure correctly according to the specification of the chip to easily realize the current sampling function, reducing the development difficulty and cycle of the system.

[0052] Exemplarily, in the present scheme, the differential circuit has a strong inhibitory effect on common mode interference, which can effectively remove the influence of common mode signals such as power supply noise and ground potential fluctuation, improving the precision and stability of current sampling. Even in a complex electromagnetic environment, the current of the battery can be accurately measured, and the current change during the battery charging and discharging process can be more accurately reflected.

[0053] Figure 2 is the schematic diagram of the differential sampling circuit in the embodiment, Figure 3 is the sampling chip and pin diagram in the embodiment, refer to Figure 2 andFigure 3 In an embodiment, the differential sampling circuit comprises:

[0054] a first resistor R1043, a second resistor R1041, a third resistor R288, a fourth resistor R1042, a fifth resistor R1045, a sixth resistor R1046, a seventh resistor R1044, and a capacitor C119;

[0055] The first negative electrode interface is connected to the first input terminal OPAl_IN of the sampling chip U3 through the first resistor R1043, and is grounded through the first resistor R1043, the second resistor R1041, the third resistor R288, and the capacitor C119;

[0056] The fourth resistor R1042 is connected in parallel with the second resistor R1041;

[0057] The reference power supply terminal VCC3V3 is grounded through the fifth resistor R1045 and the sixth resistor R1046, and the connection point of the fifth resistor R1045 and the sixth resistor R1046 is connected to the second input terminal OPAl_IP of the sampling chip U3;

[0058] The seventh resistor R1044 is connected in parallel with the sixth resistor R1046;

[0059] The output terminal OPAl_OUT of the sampling chip U3 is connected to the controller.

[0060] In an example, the sampling chip U3 used in the present embodiment can be WS72552.

[0061] In an example, the second resistor R1041 and the fourth resistor R1042 are arranged at the first input terminal OPAl_IN of the sampling chip U3, which can be used to adjust the voltage amplitude of the signal;

[0062] The third resistor R288 is used to limit the current. In the branch connected to the capacitor C119, it can prevent excessive current from charging or discharging the capacitor, thereby protecting the circuit;

[0063] The first resistor R1043, the seventh resistor R1044, the fifth resistor R1046, and the sixth resistor R1046 are used to set the bias voltage of the sampling chip U3 or constitute a bias circuit, so as to provide a suitable working point for the sampling chip U3 and ensure the normal operation of the amplifier;

[0064] In the present embodiment, the sampling chip U3 uses WS72552, which is an operational amplifier. Its basic function is to amplify the input signal, and various signal processing functions such as addition, subtraction, integration, and differentiation can be realized through circuit design;

[0065] In the scheme, the first input end OPA1_IN, the second input end OPA1_1P of the sampling chip U3 are used, and a sampling resistance network and a feedback loop are formed by the first resistor R1043, the second resistor R1041, the third resistor R288, the fourth resistor R1042, the fifth resistor R1045, the sixth resistor R1046, and the seventh resistor R1044.

[0066] Based on the virtual open and virtual short characteristics of the operational amplifier and the superposition principle, the correlation between the output (voltage) signal of the sampling chip U3 and the input current of the first input end OPA1_IN, the input current of the second input end OPA1_1P, the reference voltage, and the specified resistance in the resistance network can be derived, and the input current of the first input end OPA1_IN, i.e. the current of the battery, can be determined.

[0067] For example, after formula derivation, the current I of the battery can be expressed as: in which can be expressed by the following formula:

[0068]

[0069] In the formula, R 1042 , R 1043 , and R 1044 represent the resistance values of the fourth resistor R1042, the first resistor R1043, and the seventh resistor R1044, respectively, and V REF represents the reference voltage.

[0070] On the basis of any of the preceding schemes, in an implementable scheme, the power supply device for electric bicycles further comprises a meter, and the controller is connected to the meter; the meter is used to display the remaining power determined by the controller.

[0071] In the scheme, the remaining power determined by the controller is displayed by the meter, so that the personnel can intuitively obtain the remaining power of the battery and clearly control the actual remaining mileage.

[0072] On the basis of the scheme in which the power supply device for electric bicycles is provided with a meter, in an implementable scheme, the controller is connected to the meter through one-wire communication.

[0073] For example, in the scheme, one-wire communication technology is used, and only one cable is needed to complete the transmission of all signals, greatly reducing the complexity of wiring.

[0074] Since only one cable is needed, the amount of cable material used is reduced, thereby reducing the cost of raw materials. At the same time, simple wiring also means a reduction in installation time, thereby reducing labor costs.

[0075] On the basis of any of the preceding schemes, in an implementable scheme, the sampling unit is arranged in the controller.

[0076] On the basis of the foregoing sampling of the current of the battery, in an implementable solution, the controller is configured to determine the remaining power by using the ampere-hour integration method.

[0077] On the basis of any of the foregoing solutions, in an implementable solution, the battery is a lead-acid battery.

[0078] Reference Figures 1 to 3 On the basis of any of the foregoing solutions, in an implementable solution, the power supply device for the electric bicycle comprises:

[0079] The battery 100 is configured with a first negative electrode interface N2, a second negative electrode interface N1, and a positive electrode interface P.

[0080] The sampling unit 200 comprises a first resistor R1043, a second resistor R1041, a third resistor R288, a fourth resistor R1042, a fifth resistor R1045, a sixth resistor R1046, a seventh resistor R1044, a capacitor C119, and a sampling chip U3.

[0081] The first negative electrode interface N2 (BAT-) is connected to the first input end OPAl_IN of the sampling chip U3 through the first resistor R1043, and is grounded through the first resistor R1043, the second resistor R1041, the third resistor R288, and the capacitor C119.

[0082] The fourth resistor R1042 is connected in parallel with the second resistor R1041.

[0083] The reference power supply end VCC3V3 is grounded through the fifth resistor R1045 and the sixth resistor R1046, and the connection point of the fifth resistor R1045 and the sixth resistor R1046 is connected to the second input end OPAl_IP of the sampling chip U3.

[0084] The seventh resistor R1044 is connected in parallel with the sixth resistor R1046.

[0085] The output end OPAl_OUT of the sampling chip U3 is connected to the controller.

[0086] In this solution, the sampling unit 200 is used for sampling the current of the battery, and the controller is configured to determine the remaining power of the battery by using the current sampling value and the ampere-hour integration method.

[0087] In this solution, a differential current sampling circuit is added inside the controller, the collected current data is used for integral calculation by the program, and the charging Ah number in the process is used to convert into the power percentage.

[0088] The controller is internally provided with a differential sampling circuit of a current detection resistor, so that the current change value during use of the battery can also be acquired in real time; the controller can collect the charging current in real time by using the internal sampling circuit, the data result is integrated to accumulate the current Ah number for calculating the power percentage, and the power percentage value is transmitted to the instrument by one-wire communication after power-on, and then the current power percentage value can be displayed by the instrument.

[0089] Embodiment two

[0090] The embodiment provides an electric vehicle, which comprises any one of the electric bicycle power supply devices described in embodiment one, and the implementation process and beneficial effects of the device are the same as those of the corresponding content described in embodiment one, and the specific content will not be described again.

[0091] It should be noted that the above are only preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An electric bicycle power supply device characterized by comprising: Comprising: a battery, a sampling unit and a controller; the battery is configured with a first negative electrode interface, a second negative electrode interface and a positive electrode interface; a negative electrode of the battery is connected with the sampling unit through the first negative electrode interface, and the second negative electrode interface and the positive electrode interface are used for connecting with a charger; the controller is used for acquiring sampling data of the sampling unit, and determining a remaining power of the battery according to the sampling data.

2. The electric bicycle power supply apparatus according to claim 1, wherein The sampling unit is used for current sampling.

3. The electric bicycle power supply apparatus according to claim 2, wherein The sampling unit comprises a differential sampling circuit and a sampling chip; the first negative electrode interface is connected with the sampling chip through the differential sampling circuit, and the sampling chip is further connected with the controller.

4. The electric bicycle power supply apparatus according to claim 3, wherein The differential sampling circuit comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a capacitor; the first negative electrode interface is connected with a first input end of the sampling chip through the first resistor, and grounded through the first resistor, the second resistor, the third resistor and the capacitor; the fourth resistor is connected with the second resistor in parallel; a reference power supply end is grounded through the fifth resistor and the sixth resistor, and a connection point of the fifth resistor and the sixth resistor is connected with a second input end of the sampling chip; the seventh resistor is connected with the sixth resistor in parallel; an output end of the sampling chip is connected with the controller.

5. The electric bicycle power supply apparatus as defined in claim 1, wherein Further comprising an instrument, and the controller is connected with the instrument; the instrument is used for displaying the remaining power determined by the controller.

6. The electric bicycle power supply apparatus according to claim 5, wherein The controller is connected with the instrument through one-wire communication.

7. The electric bicycle power supply apparatus as defined in claim 1, wherein The sampling unit is configured in the controller.

8. The electric bicycle power supply apparatus as defined in claim 2, wherein The controller is configured to determine the remaining power by using ampere-hour integration method.

9. The electric bicycle power supply apparatus as defined in claim 1, wherein The battery is a lead-acid battery.

10. An electric vehicle, characterized by comprising: The application further comprises the power supply device of the electric bicycle according to any one of claims 1 to 9.

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