TW202017770A - Method and apparatus for controlling the electrical connection and disconnection between a battery unit and a supercapacitor on an automobile - Google Patents

Abstract

A method and apparatus is proposed for controlling the electrical connection and disconnection between a battery unit and a supercapacitor on an automobile with the objective of preventing the electrical connection between the battery unit and the supercapacitor from being exceedingly long that would otherwise cause degraded power supply performance or even damage to the battery unit due to the self-discharging property of the supercapacitor. This feature can help to improve the power supply performance and extends the battery life. The proposed method and apparatus is characterized by the steps that the supercapacitor is electrically connected to the battery unit only at a temporal point when there is a need to use the supercapacitor, and immediately disconnected from the supercapacitor whenever there is no more need to use the supercapacitor.

Description

Method and device for controlling electrical connection between vehicle battery and super capacitor

The invention relates to a vehicle battery power supply technology, in particular to a method and device for controlling the electrical connection between a vehicle battery and a super capacitor, which can be applied to a vehicle for controlling a battery pack and a super battery used by the vehicle The time point of the electrical connection between the capacitors, so that the super capacitor is only electrically connected to the battery pack at the time point when it is ready to be activated, and when the vehicle stops driving, it is immediately cut off between the two Electrical connection, which can improve the power supply performance of the battery and extend the battery life.

The vehicle is a popular vehicle at present, and its main feature is to use a battery and a starter motor as a source of power for the gasoline engine. However, there is a problem in the application of vehicles to batteries, that is, when the battery is discharged at high current, such as the moment the motor starts, speeding overtaking, or climbing, it will easily damage the battery and cause rapid aging. The problem. A feasible solution to this problem is to match the battery with a supercapacitor (in English called supercapacitor or ultracapacitor), so that the supercapacitor can be used to provide a momentary large current to the starting motor, thereby improving the battery power supply efficiency and extension Battery life.

However, in the application of vehicles in supercapacitors, the current practice is to permanently connect the battery to the supercapacitor, but this practice may cause the following problems. Since the super capacitor itself has the property of easy self-discharge, if the electrical connection between the battery and the super capacitor is too long, the super capacitor will continue to draw power to the battery, which may cause the battery power to be continuously wasted Bad results may even cause the battery to break.

In view of the above-mentioned problems, the application of the vehicle requires a feasible solution that can be used to avoid the electrical connection between the battery and the super capacitor for too long, so as to prevent the self-discharge of the super capacitor from causing the battery Adverse effects and damage results.

The main purpose of the present invention is to provide a feasible solution to the aforementioned problems, which can be used to avoid the electrical connection between the battery and the supercapacitor for too long, so as to prevent the self-discharge of the supercapacitor from causing damage to the battery The result of the impact and damage, thereby improving the power supply efficiency of the battery and extending the battery life.

The research and development subject of the present invention is how to control the timing of the electrical connection between the battery and the supercapacitor, that is, the battery is connected to the supercapacitor only when it is needed, and when there is no need, then That is, immediately cut off the electrical connection between the two.

The method for controlling the electrical connection between the battery and the supercapacitor of the present invention includes the following steps: (1) When the vehicle is switched to a ready-to-use state, connect the battery pack to the supercapacitor, so that the battery pack The super capacitor is charged; (2) At the time when the starting motor is started, the super capacitor is provided with an instantaneous large current to the starting motor, thereby accelerating the initial starting operation of driving the starting motor; (3) At the While the vehicle is traveling, maintain the battery pack in parallel with the supercapacitor, thereby providing a steady-state fixed voltage to the vehicle's power system; and when the power system is overloaded, make the supercapacitor provide a An instantaneous large current is given to the power system; and (4) At the time when the vehicle is switched to a stopped driving state, the electrical connection between the battery pack and the supercapacitor is cut off.

In specific implementation, the electrical connection control device between the battery and the supercapacitor of the present invention includes: (a) a control unit; (b) an operating state detection unit; (c) a switch; (d) a boost Conversion circuit; (e) A first voltage sensing module and a second voltage sensing module.

In summary, the present invention is directed to a problem that vehicles have in the application of supercapacitors, that is, if the electrical connection time between the supercapacitor and the battery pack is too long, it will cause adverse effects and damage to the battery pack. A feasible solution is proposed. The technical means used by the present invention to solve the problem is to connect the supercapacitor to the battery pack only when the vehicle is ready to be activated by the user, and immediately cut off the supercapacitor and Electrical connection between battery packs. The invention can therefore be used to prevent the electrical connection between the battery pack and the supercapacitor for too long, resulting in the self-discharge of the supercapacitor causing adverse effects and damage to the battery pack, thereby improving the power supply efficiency of the battery and extending the battery Service life.

The technical content and embodiments of the method and device for controlling the electrical connection between the vehicle battery and the super capacitor of the present invention are disclosed in detail below in conjunction with the accompanying drawings.

FIG. 1 shows an architecture of a vehicle 10 in which the electrical connection control device between the battery and the super capacitor (such as the block indicated by reference numeral 100, hereinafter referred to simply as the electrical connection control device between the battery and the super capacitor) of the present invention is applied. In specific implementation, the vehicle 10 may be any vehicle driven by battery power, such as a four-wheeled vehicle, a three-wheeled vehicle, or a two-wheeled locomotive. The vehicle 10 uses a starter motor 20 to drive wheels, and a battery pack 30 to supply power to the starter motor 20. In addition, in order to prevent the battery pack 30 being discharged at a large current, such as the moment when the motor is initially started, accelerating overtaking, or climbing, the battery pack 30 may be easily damaged and cause rapid aging problems. This vehicle 10 is additionally provided There is a supercapacitor (English called supercapacitor or ultracapacitor) 40, the capacity of the supercapacitor 40 is greater than 0.1 farad (F), by which the supercapacitor 40 can be used to provide a momentary large current to the starting motor 20, which can improve the battery Power supply efficiency and extended service life. Furthermore, the vehicle 10 utilizes an electric power system 50 to allow the battery pack 30 to provide power to other equipment, such as lights, speakers, and various vehicle equipment.

However, as previously described in relation to the prior art, if the electrical connection between the battery pack 30 and the supercapacitor 40 is a constant fixed type, it will cause the aforementioned problems of the prior art. Therefore, in response to these problems, the electrical connection control device 100 between the battery and the super capacitor of the present invention provides a feasible solution.

The electrical connection control device 100 between the battery and the supercapacitor of the present invention can be used to control the time when the battery pack 30 is electrically connected to the supercapacitor 40, that is, the time when the user is ready to activate the vehicle 10, and then connect the battery pack 30 To the supercapacitor 40; and when the vehicle 10 stops driving, the electrical connection between the battery pack 30 and the supercapacitor 40 is immediately cut off.

FIG. 2 shows a feasible embodiment of the electrical connection control device 100 between the battery and the supercapacitor of the present invention. Its architecture includes: (a) a control unit 110; (b) an operating state detection unit 120; ( c) A switch 130; (d) a boost converter circuit 140; (e) a first voltage sensing module 151 and a second voltage sensing module 152. The following is a first description of the individual attributes and functions of these components.

The control unit 110 is used to provide a main control function for the operation of the electrical connection control device 100 between the battery and the super capacitor of the present invention. The specific implementation of the control unit 110 may be, for example, a microprocessor, especially an embedded microprocessor, or a customized or programmable logic circuit, such as an application-specific integrated circuit (Application-Specific Integrated Circuit) Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), Programmable Logic Device (PLD), Programmable Logic Array (PLA), programmable Programmable Array Logic (PAL), etc.

The operation state detection unit 120 can be used to detect the operation state of the vehicle 10, including the ready-to-use state, the motor start-up state, and the stop driving state, and send a capacitor connection enable signal to the time point when the ready-to-use state is detected The control unit 110 sends a capacitor cut-off enable signal to the control unit 110 at the time when the stop driving state is detected. In specific implementation, since the vehicles currently on the market may have many different use and operation methods, such as using a remote control to lock and unlock, or a key switch to lock and unlock and start the motor, the present invention The so-called preliminary activation state may be, for example, one of the following operating states:

(1) The point in time when the user sends an unlock signal using a remote control to which the vehicle 10 belongs.

(2) The time when the user uses a key to which the vehicle 10 belongs to insert a key switch on the vehicle for unlocking.

(3) As shown in FIG. 4, at the moment when the starter motor 20 is started, the output voltage of the battery pack 30 suddenly and instantaneously drops from a state where the no-load voltage value is Vo to generate a predetermined voltage difference ΔV.

When the operating state detection unit 120 detects one of the above operating states, it will issue a capacitive connection enable signal and transmit this signal to the control unit 110. On the contrary, when the operating state detection unit 120 detects that the vehicle 10 is in a stopped driving state, it sends out a capacitor cut-off enable signal and transmits this signal to the control unit 110.

The waveform diagram of FIG. 4 shows the waveform change of the output voltage of the battery pack 30 according to the above third operating state after the starter motor 20 is started. As shown in FIG. 4, assuming that the battery pack 30 is in the no-load state and its no-load voltage value is Vo, the waveform of the output voltage of the battery pack 30 includes the following transitions at the moment when the starter motor 20 is started. Points: P1, P2, P3, P4, P5, as follows: P1: The rated output voltage value of the battery pack 30 at the initial no-load is Vo; P2: The output of the battery pack 30 at the instant when the starting motor 20 is started Voltage, for example: the first stage of key opening, the pressure drop caused by the key to open the switch of the vehicle, or the pressure drop caused by the opening of the door after the remote control is activated; P3: Because the starting motor 20 requires a momentary large current during the start of the start Drive, the output voltage of the battery pack 30 will produce a sharply decreasing waveform at the moment when the starting motor 20 is started, and P3 is the lowest point of this decreasing waveform; P4: the output voltage of the battery pack 30 reaches the lowest point It will gradually recover after P3; P5: The output voltage of the battery pack 30 rises above the rated output voltage value, and the vehicle has started at this point.

In the waveform diagram shown in FIG. 4, the present invention selects an appropriate point Q as the trigger point of the preliminary enable state between points P2 and P3, and the voltage difference between point Q and point P1 is ΔV, That is, when the operating state detection unit 120 detects that the output voltage of the battery pack 30 decreases from the state of the rated output voltage value of Vo at no load to generate a predetermined voltage difference ΔV, it sends a capacitor connection enable signal Give control unit 110.

The switch 130 is connected between the battery pack 30 and the super capacitor 40, and can be controlled by the control unit 110 to switch to the on state or the off state. If the control unit 110 receives the capacitive connection enable signal from the operation state detection unit 120, it will switch the switch 130 to the path state; on the contrary, if the capacitance cut off from the operation state detection unit 120 is received If the signal is enabled, the switch 130 will be switched to the open state. When the switch 130 is switched to the on state, it can connect the battery pack 30 to the super capacitor 40, so that the output power of the battery pack 30 can be charged to the super capacitor 40; otherwise, when it is switched to the off state , The electrical connection between the battery pack 30 and the super capacitor 40 is cut off.

The boost conversion circuit 140 is connected between the battery pack 30 and the super capacitor 40, and its activation is controlled by the boost enable signal BOOST of the control unit 110. When the boost converter circuit 140 is activated, the battery pack 30 charges the supercapacitor 40 through the boost converter circuit 140. As shown in the figure, the circuit structure of the boost converter circuit 140 includes a transistor switch 141, an inductor 142, a diode 143, and a capacitor 144. Since the circuit architecture of the boost converter circuit 140 is a conventional technology, the circuit architecture will not be described in detail below.

The first voltage sensing module 151 is used to sense the battery voltage value V _B currently output by the battery pack 30 and transmit the sensed battery voltage value V _B to the control unit 110; and the second voltage sensing module 152 It is used to sense the current capacitor voltage value Vc of the supercapacitor 40 and transmit the sensed capacitor voltage value Vc to the control unit 110. The control unit 110 first converts the sensed battery voltage value V _B and capacitor voltage value Vc to a digitalized value using its built-in A/D analog-to-digital conversion function, and then compares the size of the two. If the current battery voltage value V _{B of the} battery pack 30 is greater than the capacitance voltage value Vc of the supercapacitor 40, the control unit 110 only switches the switch 130 to the path state, but does not activate the boost conversion circuit 140, thereby enabling the battery pack 30 The output power is used to charge the supercapacitor 40 directly. On the contrary, if the battery voltage value V _B output by the battery pack 30 is less than the capacitance voltage value Vc of the supercapacitor 40, the control unit 110 uses the boost enable signal BOOST to activate the boost conversion circuit 140 to allow the battery pack 30 to pass the boost The conversion circuit 140 charges the supercapacitor 40.

In addition, in this embodiment, the electrical connection control device 100 between the battery and the super capacitor of the present invention is externally connected to an input/output control unit 200, whereby it can be externally connected to a keyboard and a screen display (not shown in (Figure), and can also be connected to a wireless network system (not shown in the figure), such as Bluetooth, 4G, Zigbee, UART, to electrically connect the battery and supercapacitor of the present invention to the control device 100 The operation status is displayed to the driver through the screen display, or transmitted to the personnel of the remote vehicle driving monitoring center through the wireless network system.

The operation flow of the electrical connection control device 100 between the battery and the supercapacitor according to the present invention in practical application is described below with reference to FIG.

In step S0, the control unit 110 first performs system initialization and sets the no-load voltage value of the battery pack 30 to the rated voltage value of Vo. When the vehicle 10 is in an unused state, the switch 130 is switched to an open state, so that the supercapacitor 40 is not electrically connected to the battery pack 30.

Then in step S1, the control unit 110 waits whether the operation state detection unit 120 detects that the vehicle 10 is switched to the ready-to-use state; if so, it proceeds to the next step S2; otherwise, if not, it continues to wait. This ready-to-activate state is, for example, the user using a remote control to which the vehicle 10 belongs to issue an unlock signal, or the user inserts a key switch on the vehicle using a key to which the vehicle 10 belongs, or starts the motor The moment when 20 is started, the output voltage of the battery pack 30 is suddenly lowered from the voltage value Vo at no-load to a predetermined voltage difference ΔV. The operation state detection unit 120 responds to the control unit 110 by sending a capacitor connection enable signal when it detects the ready-to-use state, and the control unit 110 responds to step S2.

In step S2, the control unit 110 the value of the capacitor voltage Vc the current battery voltage value V _B of the battery pack 30 and the output of the current super capacitor 40 for comparing a magnitude, wherein the battery cell voltage V _B is determined by a first voltage 30 The sensing module 151 senses, and the capacitance voltage value Vc of the supercapacitor 40 is sensed by the second voltage sensing module 152. If the battery voltage value V _B currently output by the battery pack 30 is greater than the current capacitor voltage value Vc of the supercapacitor 40, the control unit 110 then proceeds to step S3; otherwise, it proceeds to step S4.

In step S3, the control unit 110 sends a switch signal SW to the switch 130 to switch the switch 130 to the path state, thereby electrically connecting the battery pack 30 to the supercapacitor 40, so that the output power of the battery pack 30 can be connected to the supercapacitor 40 for charging. Then step S5 is executed.

In step S4, the control unit 110 sends a boost enable signal BOOST to activate the boost conversion circuit 140, so that the battery pack 30 charges the supercapacitor 40 through the boost conversion circuit 140. Then step S5 is executed.

In step S5, the control unit 110 allows the output power of the battery pack 30 to be used to charge the supercapacitor 40.

Then in step S6, the control unit 110 waits for the operation state detection unit 120 to detect whether the vehicle 10 is switched to the motor start state, that is, the motor switch 21 is switched to the path state to connect the start motor 20 to the battery pack 30 and the super Capacit 40. If yes, proceed to the next step S7; otherwise, if not, continue to wait.

In step S7, when the starter motor 20 is started, since the starter motor 20 needs to use an instantaneous large current to drive the acceleration, the control unit 110 keeps the switch 130 in the on state, so that the super capacitor 40 The capacitor voltage value Vc can be used to provide an instantaneous high voltage and large current to the starter motor 20 to drive the initial start-up operation of the accelerated starter motor 20. During the travel of the vehicle 10, the battery pack 30 remains connected in parallel to the supercapacitor 40, thereby providing a steady-state fixed voltage to the vehicle's power system 50; and when the power system 50 is overloaded, the supercapacitor 40 provides an instant large current to the power system 50.

Next, in step S8, the control unit 110 waits whether the operation state detection unit 120 detects that the vehicle 10 is switched to the stopped driving state, that is, the user is ready to no longer use the vehicle 10. If yes, proceed to the next step S9; otherwise, if not, continue to wait.

In step S9, when the vehicle 10 is switched to the stop driving state, the control unit 110 switches the switch 130 back to the open state, thereby cutting off the electrical connection between the battery pack 30 and the super capacitor 40 for The electrical connection between the battery pack 30 and the supercapacitor 40 is avoided for too long, thereby preventing the self-discharge of the supercapacitor 40 from adversely affecting the battery pack 30 and the result of damage.

After the switch 130 is switched back to the open state, the above procedure jumps back to step S1 to make the control unit 110 wait for the vehicle 10 to be switched to the ready-to-activate state, that is, whether the operation state detection unit 120 transmits a capacitor connection. Can signal; if yes, then repeat the above steps.

In the above operation process, since the present invention can electrically connect the supercapacitor 40 to the battery pack 30 only when the vehicle 10 is ready to be activated by the user, and immediately cut off the supercapacitor when the vehicle is stopped The electrical connection between the capacitor 40 and the battery pack 30, so the present invention can be used to prevent the electrical connection between the battery pack 30 and the super capacitor 40 for too long, which causes the self-discharge of the super capacitor 40 to cause the battery pack 30 Undesirable effects and damage results, thereby improving battery power supply performance and extending battery life. In addition, since the supercapacitor 40 has the property of easy self-discharge, the supercapacitor 40 cannot be pre-charged for use, and the present invention allows the supercapacitor 40 to be electrically connected to the battery pack 30 only before the time point of actual use It is used for charging and use, so that the power of the battery pack 30 can be prevented from being charged to the supercapacitor 40 when the vehicle is not in use, which causes a waste of battery power. Therefore, in summary, the present invention proposes a feasible solution to the problems that vehicles have in the application of supercapacitors.

The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the essential technical content of the present invention. The broadest and most general concept of the present invention is defined in the following patent applications. If the product or technical method completed by any other person is exactly the same as defined in the following patent application scope, or is an equivalent change, it will be deemed to be covered by the patent scope of the present invention.

10: Vehicle 20: Starting motor 21: Motor switch 30: Battery pack 40: Super capacitor 50: Power system 100: Electrical connection between battery and super capacitor of the present invention Control device 110: Control unit 120: Operation state detection unit 130 : Switch 140: boost conversion circuit 141: transistor switch 142: inductor 143: diode 144: capacitor 151: first voltage sensing module 152: second voltage sensing module 200: input/output control unit BOOST: Boost enable signal SW: Switch signal

Figure 1 is a schematic diagram of an application to show the application of the electrical connection control device between the battery and super capacitor of the present invention integrated into a vehicle; Figure 2 is a schematic diagram of the construction to show the battery and super capacitor of the present invention The structure of an embodiment of the electrical connection control device; FIG. 3 is a flowchart for showing the procedure steps performed by the electrical connection control device between the battery and the super capacitor of the present invention; FIG. 4 is a waveform diagram , To display the change of the output voltage waveform of the battery pack output voltage at the instant when the starting motor is started.

20: Start the motor

21: Motor switch

30: battery pack

40: super capacitor

100: Electric connection control device between battery and super capacitor of the present invention

110: control unit

120: Operation status detection unit

130: switch

140: Boost converter circuit

141: Transistor switch

142: Inductor

143: Diode

144: Capacitor

151: The first voltage sensing module

152: Second voltage sensing module

200: input and output control unit

BOOST: Boost enable signal

SW: switch signal

Claims (15)

A control method for electrical connection between a vehicle battery and a super capacitor can be applied to a vehicle, wherein the vehicle is driven by a starting motor, and the starting motor is powered by a battery pack and a super capacitor to control The time point of the electrical connection between the battery pack and the supercapacitor; the method for controlling the electrical connection between the battery and the supercapacitor of the vehicle includes the following steps: (1) At the time point when the vehicle is switched to a ready-to-use state, Connect the battery pack to the supercapacitor, so that the battery pack charges the supercapacitor; (2) At the time when the starting motor is started, make the supercapacitor provide a momentary large current to the starting motor, by This acceleration drives the initial start-up operation of the starter motor; (3) During the travel of the vehicle, maintaining the battery pack in parallel with the supercapacitor, thereby providing a steady-state fixed voltage to the vehicle's power system; and When the power system has an excessive load, make the supercapacitor provide an instant large current to the power system; and (4) When the vehicle is switched to a stopped state, cut off the battery pack and the super Electrical connection between capacitors. The method for controlling the electrical connection between a vehicle battery and a super capacitor as described in item 1 of the patent application scope, wherein the preliminary activation state refers to a time point when the vehicle receives an unlock signal from a remote controller to which the vehicle belongs. The method for controlling the electrical connection between a vehicle battery and a super capacitor as described in item 1 of the patent application scope, wherein the preliminary activation state refers to the time when a key to which the vehicle belongs is inserted into a key switch on the vehicle point. The method for controlling the electrical connection between a vehicle battery and a supercapacitor as described in item 1 of the patent scope, wherein the pre-activated state means that the no-load voltage of the battery pack drops instantly after the starter motor is started to produce a predetermined The time point of the voltage difference. The method for controlling the electrical connection between a vehicle battery and a super capacitor as described in item 1 of the patent application scope further includes sensing the current battery voltage value output by the battery pack and the current capacitor voltage value of the super capacitor and comparing the voltage values of the two Steps of size; if the battery voltage value is greater than the capacitor voltage value, the battery pack is charged directly to the supercapacitor; if the battery voltage value is less than the capacitor voltage value, a boost conversion function is activated to enable the The battery pack charges the supercapacitor. An electrical connection control device between a vehicle battery and a super capacitor can be applied to a vehicle, wherein the vehicle is driven by a starter motor, and the starter motor is powered by a battery pack and a supercapacitor for control The point of electrical connection between the battery and the supercapacitor; the electrical connection control device between the battery and the supercapacitor of the vehicle includes: (a) a control unit that can be used to provide a set of control functions; (b) an operation The state detection unit can detect the operating state of the vehicle and send a capacitor connection enable signal at the time when the vehicle is detected to be switched to a ready-to-use state; and when the vehicle is detected to be switched to At a time when the vehicle is stopped, a capacitor cut-off enable signal is issued; (c) A switch is provided between the battery pack and the supercapacitor, which can be switched to the path state The battery pack is connected to the supercapacitor, and its switching state is controlled by the control unit; (d) A boost converter circuit is connected between the battery pack and the supercapacitor, and its starting state is controlled by The control unit; (e) a first voltage sensing module and a second voltage sensing module, wherein the first voltage sensing module is used to sense the battery voltage value currently output by the battery pack, and The second voltage sensing module is used to sense the current capacitor voltage value of the supercapacitor for the control unit to compare the battery voltage value and the capacitor voltage value; if the battery voltage value is greater than the capacitor voltage, then The battery pack directly charges the supercapacitor; if the battery voltage value is less than the capacitor voltage, the boost conversion circuit is activated, so that the battery pack charges the supercapacitor through the boost conversion circuit. The device for electrically connecting a vehicle battery and a super capacitor as described in item 6 of the patent application scope, wherein the preliminary activation state refers to the time point when the vehicle receives an unlock signal from a remote controller to which it belongs. The device for electrically connecting a vehicle battery and a super capacitor as described in item 6 of the patent application scope, wherein the preliminary activation state refers to the time when a key to which the vehicle belongs is inserted into a key switch on the vehicle point. The electrical connection control device between the vehicle battery and the supercapacitor as described in item 6 of the patent application scope, wherein the preparatory activation state means that the no-load voltage of the battery pack instantly drops after the starter motor is started to produce a predetermined The time point of the voltage difference. The device for electrically connecting a vehicle battery and a super capacitor as described in item 6 of the patent application scope, wherein the switch is one of a relay, a solid state relay, or an electronic switch. The control device for the electrical connection between the vehicle battery and the super capacitor as described in item 6 of the patent scope, wherein the control unit is an embedded microprocessor. The control device for the electrical connection between the vehicle battery and the supercapacitor as described in item 6 of the patent scope, wherein the control unit is a programmable logic circuit, and its available types include integrated circuits for special applications, programmable on site Logic gate array, programmable logic device, programmable logic array, and programmable array logic. The electrical connection control device between the vehicle battery and the super capacitor as described in item 6 of the scope of the patent application further includes an input and output control unit, thereby externally connected to a keyboard, a screen display, and a wireless network system. The device for electrically connecting a vehicle battery and a super capacitor as described in item 6 of the patent application scope, wherein the control unit causes the switch to switch to the path state when the vehicle is switched to a ready-to-use state, By connecting the battery pack to the supercapacitor, the battery pack charges the supercapacitor; at the time point when the vehicle is traveling, the control unit maintains the battery pack in parallel to the supercapacitor, thereby providing a A steady-state fixed voltage is given to the vehicle's power system; and when the power system has an excessive load, the supercapacitor is provided with an instantaneous large current to the power system; when the vehicle is switched to a stopped state , The control unit switches the switch to an open state, thereby cutting off the electrical connection between the battery pack and the supercapacitor. The device for electrically connecting a vehicle battery and a super capacitor as described in item 1 or 6 of the patent application scope, wherein the capacity of the super capacitor is greater than 0.1 farad.

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