Battery interconnection matching device and electric vehicle

Abstract

The present invention provides a battery interconnection matching device and an electric vehicle, comprising: a motor, a controller, a first contactor, a second contactor, a drive board, a first battery and a second battery; when the entire vehicle is stationary or charging, the controller does not send a control signal to the drive board, and the first battery and the second battery are connected in parallel; when the entire vehicle is riding, the controller detects the rotational speed of the motor and obtains the current vehicle speed based on the rotational speed of the motor; the current vehicle speed is compared with a preset vehicle speed, and if the current vehicle speed is less than the preset vehicle speed, no control signal is sent to the drive board, the first contactor and the second contactor do not operate, the first battery and the second battery are connected in parallel, the battery voltage at both ends of the controller is U, and the capacity is 2C; if the current vehicle speed is greater than the preset vehicle speed, the controller controls the first contactor to be attracted through the drive board, and then controls the second contactor to be attracted through the drive board, the first battery and the second battery are connected in series, the battery voltage at both ends of the controller is 2U, and the capacity is C.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle control, in particular to a battery interconnection matching device and an electric vehicle. Background Art

[0002] Currently, if an electric vehicle needs to accelerate strongly from a start, a large starting current is required to generate a large torque. The maximum discharge current allowed by the battery is affected and limited by the battery's discharge rate.

[0003] If an electric car needs a high speed, the battery voltage needs to be high, and the high voltage can be used to increase the speed of the motor. At this time, the discharge current of the battery is not large, and the required torque is not high at the start.

[0004] If you want to achieve strong starting acceleration and be able to ride at high speeds, you need to install a high-voltage, large-capacity battery to meet the starting power and high-speed requirements, but this will make the battery too large and the cost too high. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a battery interconnection matching device and an electric vehicle, which, through the mutual matching of a first battery and a second battery, can achieve low voltage and high capacity at low speed and high voltage and low capacity at high speed, thereby meeting the current requirements of the electric vehicle at different speeds.

[0006] In a first aspect, an embodiment of the present invention provides a battery interconnection matching device, the device including a motor, a controller, a first contactor, a second contactor, a drive board, a first battery, and a second battery, wherein the voltage of the first battery and the voltage of the second battery are both U, and the capacity of the first battery and the capacity of the second battery are both C;

[0007] The motor, the drive board, the first battery, and the second battery are respectively connected to the controller, the first contactor and the second contactor are respectively connected to the first battery, the second battery, and the drive board, the second battery is connected to the drive board, and the first contactor is connected to the second contactor;

[0008] When the vehicle is stationary or charging, the controller does not send a control signal to the drive board, and the first battery and the second battery are connected in parallel;

[0009] When the vehicle is riding, the controller detects the rotation speed of the motor and obtains the current vehicle speed based on the rotation speed of the motor; compares the current vehicle speed with a preset vehicle speed; if the current vehicle speed is less than the preset vehicle speed, the control signal is not sent to the drive board, the first contactor and the second contactor are not operated, the first battery and the second battery are connected in parallel, the battery voltage across the controller is U, and the capacity is 2C;

[0010] If the current vehicle speed is greater than the preset vehicle speed, the controller controls the first contactor to be attracted through the drive board, and then controls the second contactor to be attracted through the drive board. The first battery and the second battery are connected in series, the battery voltage at both ends of the controller is 2U, and the capacity is C.

[0011] Furthermore, the driving board is configured to receive a first control signal sent by the controller when the current vehicle speed is greater than the preset vehicle speed, and control the first contactor to be attracted and the first battery and the second battery to be disconnected according to the first control signal;

[0012] When the first contactor is closed, the first auxiliary contact of the first contactor is closed, and the first main contact and the second main contact are opened.

[0013] Furthermore, the driving board is used to receive a second control signal sent by the controller after the first contactor is closed, and control the second contactor to be closed according to the second control signal, so that the first battery and the second battery are connected in series;

[0014] When the second contactor is closed, the second auxiliary contact and the third main contact are closed.

[0015] Furthermore, when the vehicle is stationary or charging, the controller does not send a control signal to the drive board, the first auxiliary contact of the first contactor is disconnected, the first main contact and the second main contact are closed, and the second auxiliary contact and the third main contact of the second contactor are disconnected.

[0016] Furthermore, it also includes an alarm;

[0017] When the vehicle is stationary or charging, the controller does not send a control signal to the driving board, the first battery and the second battery are connected in parallel, and the alarm is powered by the first battery and the second battery.

[0018] Furthermore, the driving board includes an optical coupler and a MOS tube;

[0019] The driving board is used to convert the first voltage input by the controller into a second voltage;

[0020] The first voltage is 5V, and the second voltage is 12V.

[0021] Furthermore, the MOS transistor is an enhancement-mode P-channel MOS transistor.

[0022] Furthermore, a DC converter is included;

[0023] The DC converter is used to convert the battery voltage into a second voltage.

[0024] Furthermore, it also includes an auxiliary power supply circuit, which includes one or more of lamps, instruments and speakers.

[0025] In a second aspect, an embodiment of the present invention provides an electric vehicle, comprising the battery interconnection matching device as described above.

[0026] An embodiment of the present invention provides a battery interconnection matching device and an electric vehicle, comprising: a motor, a controller, a first contactor, a second contactor, a drive board, a first battery and a second battery, the voltage of the first battery and the voltage of the second battery being both U, the capacity of the first battery and the capacity of the second battery being both C; the motor, the drive board, the first battery and the second battery being respectively connected to the controller, the first contactor and the second contactor being respectively connected to the first battery, the second battery and the drive board, the second battery being connected to the drive board, and the first contactor being connected to the second contactor; when the vehicle is stationary or charging, the controller does not send a control signal to the drive board, and the first battery and the second battery are connected in parallel; when the vehicle is riding, the controller detects the speed of the motor and calculates the speed of the motor based on the speed of the motor. The current vehicle speed is obtained according to the speed of the motor; the current vehicle speed is compared with the preset vehicle speed. If the current vehicle speed is less than the preset vehicle speed, no control signal is sent to the drive board, the first contactor and the second contactor do not operate, the first battery and the second battery are connected in parallel, and the battery voltage at both ends of the controller is U, and the capacity is 2C; if the current vehicle speed is greater than the preset vehicle speed, the controller controls the first contactor to be attracted through the drive board, and then controls the second contactor to be attracted through the drive board, the first battery and the second battery are connected in series, and the battery voltage at both ends of the controller is 2U, and the capacity is C; by matching the first battery and the second battery, low voltage and high capacity are achieved at low speed and high voltage and low capacity are achieved at high speed, thereby meeting the current demand of the electric vehicle at different speeds.

[0027] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of a matching device for interconnecting batteries provided in the first embodiment of the present invention;

[0031] Figure 2 A schematic structural diagram of a battery interconnection matching device provided in Example 1 of the present invention;

[0032] Figure 3 A schematic diagram of the structure of a driving board provided in the first embodiment of the present invention;

[0033] Figure 4 This is an electrical schematic diagram of an electric vehicle provided in Example 2 of the present invention.

[0034] icon:

[0035] 1-motor; 2-controller; 3-first contactor; 4-second contactor; 5-drive board; 6-first battery; 7-second battery. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0038] Example 1:

[0039] Figure 1 Schematic diagram of a battery interconnection matching device provided in Example 1 of the present invention.

[0040] Reference Figure 1 The device includes a motor 1, a controller 2, a first contactor 3, a second contactor 4, a drive board 5, a first battery 6 and a second battery 7. The voltage of the first battery 6 and the voltage of the second battery 7 are both U, and the capacity of the first battery 6 and the capacity of the second battery 7 are both C.

[0041] The motor 1, the drive board 5, the first battery 6 and the second battery 7 are respectively connected to the controller 2, the first contactor 3 and the second contactor 4 are respectively connected to the first battery 6, the second battery 7 and the drive board 5, the second battery 7 is connected to the drive board 5, and the first contactor 3 is connected to the second contactor 4;

[0042] When the vehicle is stationary or charging, the controller 2 does not send a control signal to the drive board 5, and the first battery 6 and the second battery 7 are connected in parallel;

[0043] When the vehicle is riding, the controller 2 detects the rotation speed of the motor 1 and obtains the current vehicle speed based on the rotation speed of the motor 1; the current vehicle speed is compared with the preset vehicle speed. If the current vehicle speed is less than the preset vehicle speed, no control signal is sent to the drive board 5, the first contactor 3 and the second contactor 4 do not operate, the first battery 6 and the second battery 7 are connected in parallel, the battery voltage across the controller 2 is U, and the capacity is 2C; at this time, the battery can discharge current is twice that of the original single battery pack, and the controller 2 can obtain a large current to generate a large torque for the motor;

[0044] If the current vehicle speed is greater than the preset speed, the controller 2 controls the first contactor 3 to be energized through the drive board 5, and then controls the second contactor 4 to be energized through the drive board 5. The first battery 6 and the second battery 7 are connected in series. The battery voltage at both ends of the controller 2 is 2U and the capacity is C. At this time, the battery voltage is twice that of the original single battery group. The controller 2 can obtain high voltage to make the motor run at a high speed.

[0045] Further, refer to Figure 2 The driving board is used to receive a first control signal sent by the controller when the current vehicle speed is greater than a preset vehicle speed, and control the first contactor to be attracted and the first battery and the second battery to be disconnected according to the first control signal;

[0046] When the first contactor is closed, the first auxiliary contact of the first contactor is closed, and the first main contact and the second main contact are opened.

[0047] Furthermore, the driving board is used to receive a second control signal sent by the controller after the first contactor is closed, and control the second contactor to be closed according to the second control signal, so that the first battery and the second battery are connected in series;

[0048] When the second contactor is closed, the second auxiliary contact and the third main contact are closed.

[0049] Furthermore, when the vehicle is stationary or charging, the controller does not send a control signal to the drive board, the first auxiliary contact of the first contactor is disconnected, the first main contact and the second main contact are closed, and the second auxiliary contact and the third main contact of the second contactor are disconnected.

[0050] Here, the first contactor KM1 includes a first auxiliary contact, a first main contact, and a second main contact. The first contactor KM1 can control the parallel connection or disconnection of the first battery and the second battery, and the negative terminal of the second contactor KM2 is energized.

[0051] The second contactor KM2 includes a second auxiliary contact and a third main contact, which controls the first battery and the second battery to be connected in series when the first contactor KM1 is closed, and ensures that the first contactor KM1 is not disconnected when the second contactor KM2 is closed.

[0052] It also includes a 12V battery to ensure a stable voltage for the auxiliary power supply circuit and the driver board.

[0053] Specifically, refer to Table 1 of the control drive:

[0054] Serial number d1 d2 Two battery status 1 0 0 in parallel 2 0 1 in parallel 3 1 0 disconnect 4 1 1 Series

[0055] As can be seen from Table 1, the first battery and the second battery can be connected in series only after d1 sends the first control signal and d2 sends the second control signal. In principle, the sending of the series control signal should be d1 first and then d2. However, if they are sent at the same time or d2 is sent first, since the coil of the second contactor KM2 needs to be attracted by the first contactor KM1 before it is connected to the negative pole, there will only be a situation where the first contactor KM1 is attracted first and the second contactor KM2 is attracted later. The situation where the first contactor KM1 is not attracted and the second contactor KM2 is attracted, resulting in a battery short circuit, will not occur.

[0056] When the second contactor KM2 is energized, connect the positive pole of the coil of the first contactor KM1 to the 12V power supply to prevent the first contactor KM1 from losing power due to circuit control reasons during the battery series connection, resulting in the first contactor KM1 not being energized while the second contactor KM2 is still energized and causing a short circuit.

[0057] As shown in Table 1, even if the controller and driver board output signals are disrupted, a battery short circuit will not occur. The battery interconnect matching device of this application is low-cost, requires minimal modification, and is easy to implement. This battery interconnect matching device enables a powerful and high-speed riding experience.

[0058] Furthermore, it also includes an alarm;

[0059] When the vehicle is stationary or charging, the controller does not send control signals to the driver board, the first battery and the second battery are connected in parallel, and the alarm is powered by the first battery and the second battery. The alarm is connected to components such as the DC converter, the second battery, and the controller.

[0060] Further, refer to Figure 3 , the driver board includes an optocoupler and a MOS tube;

[0061] A driving board, configured to convert a first voltage inputted from the controller into a second voltage;

[0062] The first voltage is 5V and the second voltage is 12V.

[0063] Furthermore, the MOS transistor is an enhancement-type P-channel MOS transistor.

[0064] Specifically, the controller is powered by 5V, and the controller outputs 5V to U01 of the driver board; when the diode in the optocoupler lights up, pin 3 and pin 4 are short-circuited, and at this time, the MOS tube is turned on and outputs 12V.

[0065] Furthermore, a DC converter is included;

[0066] A DC converter is used to convert the battery voltage into a second voltage. The DC converter is connected to the alarm, the driver board, the 12V battery, the second battery and other components respectively.

[0067] Furthermore, it also includes an auxiliary power supply circuit, which includes one or more of lamps, instruments and speakers.

[0068] An electric vehicle comprises the battery interconnection matching device as described above.

[0069] An embodiment of the present invention provides a battery interconnection matching device and an electric vehicle, comprising: a motor, a controller, a first contactor, a second contactor, a drive board, a first battery and a second battery, the voltage of the first battery and the voltage of the second battery being both U, the capacity of the first battery and the capacity of the second battery being both C; the motor, the drive board, the first battery and the second battery being respectively connected to the controller, the first contactor and the second contactor being respectively connected to the first battery, the second battery and the drive board, the second battery being connected to the drive board, and the first contactor being connected to the second contactor; when the vehicle is stationary or charging, the controller does not send a control signal to the drive board, and the first battery and the second battery are connected in parallel; when the vehicle is riding, the controller detects the speed of the motor and calculates the speed of the motor based on the speed of the motor. The current vehicle speed is obtained according to the speed of the motor; the current vehicle speed is compared with the preset vehicle speed. If the current vehicle speed is less than the preset vehicle speed, no control signal is sent to the drive board, the first contactor and the second contactor do not operate, the first battery and the second battery are connected in parallel, and the battery voltage at both ends of the controller is U, and the capacity is 2C; if the current vehicle speed is greater than the preset vehicle speed, the controller controls the first contactor to be attracted through the drive board, and then controls the second contactor to be attracted through the drive board, the first battery and the second battery are connected in series, and the battery voltage at both ends of the controller is 2U, and the capacity is C; by matching the first battery and the second battery, low voltage and high capacity are achieved at low speed and high voltage and low capacity are achieved at high speed, thereby meeting the current demand of the electric vehicle at different speeds.

[0070] Example 2:

[0071] Figure 4 This is an electrical schematic diagram of an electric vehicle provided in Example 2 of the present invention.

[0072] Reference Figure 4 The motor, controller, alarm, DC converter, brake handle and auxiliary power supply circuit are the main components of the electric vehicle. Among them, the controller can be a single chip microcomputer.

[0073] Among them, the motor is the component that drives the entire vehicle, the controller is the component that converts the battery's DC power into AC to drive the motor, the alarm is an anti-theft alarm device (including functions such as powering on the vehicle's ACC, collecting controller wheel movement signals, sending lock motor commands to the controller, and vibration / wheel movement alarms in the armed state), and the DC converter is the component that converts the battery voltage into 12V.

[0074] The controller receives a brake handle signal for driving the motor. The brake handle signal is generated by the combined action of the brake handle and the handlebar. The brake handle includes a left brake handle and a right brake handle. The electric vehicle can be a light motorcycle.

[0075] The computer program product provided in the embodiments of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the previous method embodiments. For specific implementation, please refer to the method embodiments and will not be repeated here.

[0076] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0077] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0078] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling 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 method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0079] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0080] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A battery interconnection matching device, characterized in that: The device includes a motor, a controller, a first contactor, a second contactor, a drive board, a first battery and a second battery, the voltage of the first battery and the voltage of the second battery are both U, and the capacity of the first battery and the capacity of the second battery are both C; The motor, the drive board, the first battery, and the second battery are respectively connected to the controller, the first contactor and the second contactor are respectively connected to the first battery, the second battery, and the drive board, the second battery is connected to the drive board, and the first contactor is connected to the second contactor; When the vehicle is stationary or charging, the controller does not send a control signal to the drive board, and the first battery and the second battery are connected in parallel; When the vehicle is riding, the controller detects the rotation speed of the motor and obtains the current vehicle speed based on the rotation speed of the motor; compares the current vehicle speed with a preset vehicle speed; if the current vehicle speed is less than the preset vehicle speed, the control signal is not sent to the drive board, the first contactor and the second contactor are not operated, the first battery and the second battery are connected in parallel, the battery voltage across the controller is U, and the capacity is 2C; If the current vehicle speed is greater than the preset vehicle speed, the controller controls the first contactor to be closed through the drive board, and then controls the second contactor to be closed through the drive board, the first battery and the second battery are connected in series, the battery voltage at both ends of the controller is 2U, and the capacity is C; The driving board is configured to receive a first control signal sent by the controller when the current vehicle speed is greater than the preset vehicle speed, and control the first contactor to be attracted and the first battery and the second battery to be disconnected according to the first control signal; When the first contactor is closed, the first auxiliary contact of the first contactor is closed, and the first main contact and the second main contact are disconnected; The driving board is configured to receive a second control signal sent by the controller after the first contactor is closed, and control the second contactor to be closed according to the second control signal, so that the first battery and the second battery are connected in series; When the second contactor is closed, the second auxiliary contact and the third main contact are closed; When the vehicle is stationary or charging, the controller does not send the control signal to the drive board, the first auxiliary contact of the first contactor is disconnected, the first main contact and the second main contact are closed, and the second auxiliary contact and the third main contact of the second contactor are disconnected.

2. The battery interconnection matching device according to claim 1, characterized in that: Also includes alarm; When the vehicle is stationary or charging, the controller does not send the control signal to the driving board, the first battery and the second battery are connected in parallel, and the alarm is powered by the first battery and the second battery.

3. The battery interconnection matching device according to claim 1, characterized in that: The driving board includes an optical coupler and a MOS tube; The driving board is used to convert the first voltage input by the controller into a second voltage; The first voltage is 5V, and the second voltage is 12V.

4. The battery interconnection matching device according to claim 3, characterized in that: The MOS transistor is an enhancement-type P-channel MOS transistor.

5. The battery interconnection matching device according to claim 1, characterized in that: Also includes a DC converter; The DC converter is used to convert the battery voltage into a second voltage.

6. The battery interconnection matching device according to claim 1, characterized in that: It also includes an auxiliary power supply circuit, which includes one or more of a lamp, an instrument and a speaker.

7. An electric vehicle, characterized in that: A matching device for interconnecting batteries comprising the battery according to any one of claims 1 to 6.

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