Novel high-magnification hybrid power supply with short-circuit protection

Abstract

The invention relates to the technical field of automobile batteries, in particular to a novel high-magnification hybrid power supply with short-circuit protection. The device is characterized by comprising a voltage conversion module, a common multiplying power battery and a low-temperature high-multiplying power battery, the low-temperature high-multiplying power battery comprises a short-circuit protection module, the voltage conversion module comprises a bidirectional DC / DC unit I and a bidirectional DC / DC unit II, the front end of the bidirectional DC / DC unit I is connected with an interface II, the rear end of the bidirectional DC / DC unit I is connected with the front end of the bidirectional DC / DC unit II, and the interface II is connected with the interface II. The rear end of the first bidirectional DC / DC unit is connected with the third interface, and the rear end of the second bidirectional DC / DC unit is connected with the first interface. The first interface is connected with the common multiplying power battery, the third interface is used for being connected with a photovoltaic power generation assembly, the second interface is connected with the low-temperature high-multiplying power battery, and the second interface is used for being connected with related parts of an automobile. The hybrid power supply can act on an internal combustion engine of more than 8KW, can meet the normal use of an automobile, and cannot start the automobile due to excessive discharge of a battery when an air conditioner is stopped and used.

Description

Technical Field

[0001] The invention relates to the technical field of automobile batteries, in particular to a new type of high-rate hybrid power supply with short-circuit protection. Background Art

[0002] When the car is parked and started, a large current needs to be instantly passed in order to ignite the internal combustion engine. This large current is generally provided by the car power supply. At present, traditional car power supplies are generally conventional lithium batteries or lithium iron phosphate batteries, that is, ordinary rate batteries. However, ordinary rate batteries have poor performance at low temperatures, especially in ultra-low temperature environments below -20°C. The instantaneous current they generate is small, and they often fail to ignite, and they cannot act on internal combustion engines above 8KW at all. There are also proposals in the prior art to use low-temperature high-rate batteries as car power sources, but low-temperature high-rate batteries have high specific energy and low battery capacity under the same volume, which cannot meet the normal use of the car. In addition, when the car is parked, there may be a need for air conditioning. The battery power of traditional internal combustion engine cars is generally provided by car generators. If the air conditioner is used when the car is parked, the battery will be discharged too much, resulting in failure to start. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new type of high-rate hybrid power supply with short-circuit protection, which can act on internal combustion engines above 8KW, can meet the normal use of the car, and will not cause excessive battery discharge and inability to start the vehicle due to parking and using air conditioning.

[0004] In order to solve the above problems, the following technical solutions are provided: The new high-rate hybrid power supply with short-circuit protection of the present invention is characterized in that it includes a voltage conversion module, a common rate battery and a low-temperature high-rate battery. The low-temperature high-rate battery contains a short-circuit protection module. The voltage conversion module contains a bidirectional DC / DC unit 1 and a bidirectional DC / DC unit 2, the front end of the bidirectional DC / DC unit 1 is connected to the interface 2, the rear end of the bidirectional DC / DC unit 1 is connected to the front end of the bidirectional DC / DC unit 2, and the rear end of the bidirectional DC / DC unit 1 is connected to the interface 3, and the rear end of the bidirectional DC / DC unit 2 is connected to the interface 1. The interface 1 is connected to the common rate battery. The interface 3 is used to connect to the photovoltaic power generation component to receive the electric energy generated by the photovoltaic power generation component. The interface 2 is connected to the low-temperature high-rate battery, and the interface 2 is used to connect to automobile-related components to provide electric energy to automobile-related components or receive electric energy generated by automobile-related components.

[0005] The common rate battery is used to power automobile related parts or low temperature high rate battery through interface 1, bidirectional DC / DC unit 2, bidirectional DC / DC unit 1 and interface 2. The low temperature high rate battery is used to power automobile related parts through interface 2; the electric energy generated by automobile related parts is used to charge the low temperature high rate battery through interface 2, and the electric energy generated by automobile related parts is also used to charge the common rate battery through interface 2, bidirectional DC / DC unit 1, bidirectional DC / DC unit 2 and connector 1.

[0006] The short-circuit protection module includes a controllable switch located on the battery power supply circuit and a feedback network for driving the controllable switch to be turned on or off. The feedback network is connected to the circuit section between the controllable switch and the positive electrode of the battery and is used to collect the circuit voltage. When a short circuit occurs in the load of the battery power supply circuit, causing the circuit voltage to rise, the feedback network controls the controllable switch to close. There is a current limiting rapid rise module on the circuit section between the circuit access point of the feedback network and the controllable switch, which is used to ensure that the controllable switch will not be damaged before being turned off.

[0007] The current limiting fast rise module includes an inductor L connected in series in the loop, and a reverse diode D1 is connected in parallel at both ends of the inductor L. The input end of the feedback network is connected to the upper end of the inductor L.

[0008] The controllable switch includes a MOS tube Q1 and a MOS tube Q2; the source of the MOS tube Q2 is connected to the lower end of the inductor L, the gate of the MOS tube Q2 is connected to the drive signal C+, the drain of the MOS tube Q2 is connected to the drain of the MOS tube Q1, and the source of the MOS tube Q1 is connected to the negative electrode of the battery. The output end of the feedback network is connected to the gate of the MOS tube Q1, and is used to generate a gate-connected drive signal D+. When the load of the battery power supply circuit is short-circuited, causing the circuit voltage to increase, the gate-connected drive signal D+ is reversed, and the MOS tube Q1 is turned off.

[0009] The feedback network includes a resistor R1, one end of which is connected to the upper end of the inductor L, the other end of which is connected to one end of the capacitor C1 and one end of the resistor R2, the other end of the capacitor C1 is grounded, and the other end of the resistor R2 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R4 is connected to the power supply VCC, and the other end of the resistor R6 generates the gate connection drive signal D+.

[0010] The low-temperature high-rate battery is a low-temperature sodium ion battery.

[0011] The normal rate battery is a normal rate lithium iron phosphate battery.

[0012] The above solution has the following advantages: Since the voltage conversion module of the high-rate novel hybrid power supply with short-circuit protection of the present invention contains a bidirectional DC / DC unit 1 and a bidirectional DC / DC unit 2, the front end of the bidirectional DC / DC unit 1 is connected to the interface 2, the rear end of the bidirectional DC / DC unit 1 is connected to the front end of the bidirectional DC / DC unit 2, and the rear end of the bidirectional DC / DC unit 1 is connected to the interface 3, the rear end of the bidirectional DC / DC unit 2 is connected to the interface 1, and the interface 1 is connected to the ordinary rate battery; the interface 3 is used to be connected to the photovoltaic power generation component for receiving the electric energy generated by the photovoltaic power generation component, the interface 2 is connected to the low-temperature high-rate battery, and the interface 2 is used to be connected to automobile-related components for providing electric energy to the automobile-related components or receiving the electric energy generated by the automobile-related components. The hybrid power source uses a mixture of low-temperature high-rate batteries and ordinary rate batteries. In ultra-low temperature environments, the low-temperature high-rate batteries provide the starting power for the car, and in normal environments, the ordinary rate batteries provide power for the car, so that the hybrid power source can ensure the ignition of the car at low temperatures, and the CCA of the low-temperature high-rate batteries at low temperatures can reach 2000-3000, so it can be applied to internal combustion engines above 8KW. Moreover, the low-temperature high-rate battery is used only for low-temperature starting, so there is no need to set a larger capacity, and then, the volume of the hybrid power source is almost the same as that of the vehicle battery in the prior art, and the conventional vehicle power supply is still provided by ordinary rate batteries, which can also meet the normal operation of the vehicle. By adding a photovoltaic power generation component as the power supply end of the hybrid power source, when the air conditioner is used when the car is parked, even if the battery is discharged too much, there is still a photovoltaic power generation component to supplement the battery, so that the vehicle cannot be started due to excessive battery discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural topology diagram of a high-rate novel hybrid power supply with short-circuit protection of the present invention; Figure 2 The invention discloses a circuit diagram of a short-circuit protection module in a high-rate novel hybrid power supply with short-circuit protection. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0015] like Figure 1 As shown, a new type of high-rate hybrid power supply with short-circuit protection of the present invention includes a voltage conversion module, a normal-rate battery and a low-temperature high-rate battery. The low-temperature high-rate battery contains a short-circuit protection module for realizing overvoltage protection of the low-temperature high-rate battery. In this embodiment, the normal-rate battery is a normal-rate lithium iron phosphate battery, and the low-temperature high-rate battery is a low-temperature sodium ion battery. The low-temperature sodium ion battery has no memory of over-discharge characteristics, so only the low-temperature sodium ion battery needs to be over-voltage protected, and no discharge under-voltage protection is performed.

[0016] like Figure 1 As shown, the voltage conversion module includes a bidirectional DC / DC unit 1 and a bidirectional DC / DC unit 2, the front end of the bidirectional DC / DC unit 1 is connected to the interface 2, the rear end of the bidirectional DC / DC unit 1 is connected to the front end of the bidirectional DC / DC unit 2, and the rear end of the bidirectional DC / DC unit 1 is connected to the interface 3, and the rear end of the bidirectional DC / DC unit 2 is connected to the interface 1. Interface 1 is connected to a common rate battery. Interface 3 is used to connect to a photovoltaic power generation component to receive the electric energy generated by the photovoltaic power generation component. Interface 2 is connected to a low-temperature high-rate battery, and interface 2 is used to connect to automobile-related components to provide electric energy to automobile-related components or receive electric energy generated by automobile-related components. The common rate battery is used to power automobile-related components or a low-temperature high-rate battery through interface 1, bidirectional DC / DC unit 2, bidirectional DC / DC unit 1 and interface 2. The low-temperature high-rate battery is used to power automobile-related components through interface 2. The electric energy generated by the automobile-related parts is used to charge the low-temperature high-rate battery through interface 2, and the electric energy generated by the automobile-related parts is also used to charge the ordinary rate battery through interface 2, bidirectional DC / DC unit 1, bidirectional DC / DC unit 2 and connector 1. In this embodiment, the voltage conversion module adopts a bidirectional DCDC board produced by Haisuo Technology Co., Ltd., which is integrated with an MCU, and its MCU is connected to the automobile controller through the RS485 bus, and the Modbus communication protocol is used between the two. The bidirectional DC / DC units all use Buck-Boost circuits, and the specific circuit structure is the prior art, which will not be repeated here. Automobile-related parts are divided into automobile electrical equipment and automobile generators. Automobile electrical equipment can be air conditioners, inverters, etc. The specific connection structure of automobile-related parts and interface 2 is the same as the connection method between automobile-related parts and automobile batteries in the prior art, which belongs to the prior art and will not be repeated here. The electric energy generated by the automobile generator is converted by the automobile inverter to charge the low-temperature high-rate battery, and is also used to charge the ordinary rate battery through interface 2, bidirectional DC / DC unit 1, bidirectional DC / DC unit 2 and connector 1. The normal rate battery and the low temperature high rate battery have their own BMS, which are connected to each other through the RS485 bus, and they are also connected to the car controller through the RS485 bus. The electricity generated by the photovoltaic power generation component is used to replenish the two batteries after passing through the bidirectional DC / DC unit 1 and the bidirectional DC / DC unit 2, so that the battery can still be charged when the car is parked.

[0017] like Figure 2As shown, the short-circuit protection module includes a controllable switch located on the battery power supply circuit and a feedback network for driving the controllable switch to be turned on or off, and the feedback network is connected to the circuit section between the controllable switch and the positive electrode of the battery, and is used to collect the circuit voltage. In this embodiment, the positive electrode of the battery is connected to the upper end of the load, the lower end of the load is connected to the negative electrode of the battery through the controllable switch, and the feedback network is connected to the lower end of the load. When a short circuit occurs in the load of the battery power supply circuit, causing the circuit voltage to increase, the feedback network controls the controllable switch to close, thereby achieving short-circuit protection.

[0018] There is a current limiting fast rise module on the loop between the loop access point of the feedback network and the controllable switch, which is used to ensure that the controllable switch will not be damaged before it is turned off. The current limiting fast rise module includes an inductor L connected in series on the loop, the upper end of the inductor L is connected to the lower end of the load, and the lower end of the inductor L is connected to the controllable switch. A reverse diode D1 is connected in parallel at both ends of the inductor L. When a short circuit occurs, the short-circuit current is limited by the inductor L and rises slowly, which can ensure that within the effective time of the entire action of the feedback network, the short-circuit current will not rise to exceed the tolerance limit of the controllable switch, ensuring that the short-circuit protection is non-destructive, safe and reliable.

[0019] like Figure 2 As shown, the controllable switch includes a MOS transistor Q1 and a MOS transistor Q2. The source of the MOS transistor Q2 is connected to the lower end of the inductor L, the gate of the MOS transistor Q2 is connected to the drive signal C+, the drain of the MOS transistor Q2 is connected to the drain of the MOS transistor Q1, and the source of the MOS transistor Q1 is connected to the negative electrode of the battery. The output end of the feedback network is connected to the gate of the MOS transistor Q1, which is used to generate a gate-connected drive signal D+. When the load of the battery power supply circuit is short-circuited and the circuit voltage increases, the potential of the gate-connected drive signal D+ is reversed, and the MOS transistor Q1 is turned off. The feedback network includes a resistor R1, one end of the resistor R1 is connected to the upper end of the inductor L, the other end of the resistor R1 is respectively connected to one end of the capacitor C1 and the resistor R2, the other end of the capacitor C1 is grounded, and the other end of the resistor R2 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to one end of the resistor R4 and the resistor R6, the other end of the resistor R4 is connected to the power supply VCC, and the other end of the resistor R6 generates a gate-connected drive signal D+. When a short circuit occurs, the short-circuit current is limited by the inductor L and rises slowly. By adjusting the parameters of R1, R2, C1, Q3, R4, and R6, it can be ensured that within the effective time of the entire action of the short-circuit protection circuit, the short-circuit current will not rise to exceed the tolerance limit of the MOS tubes Q1 and Q2, ensuring that the short-circuit protection is non-destructive, safe and reliable.

[0020] In this embodiment, there is an electric heating wire in the ordinary rate battery, and the electric heating wire is connected to the low-temperature high-rate battery. When the temperature of the ordinary rate battery is lower than -20°C, the low-temperature high-rate battery supplies power to the electric heating wire, thereby heating the ordinary rate battery to above -20°C, and realizing low-temperature charging of the ordinary rate battery. After the car is started in an environment of -40~-20°C, the car engine generates electricity to charge the low-temperature high-rate battery, and the low-temperature high-rate battery supplies power to the electric heating wire. After the temperature of the ordinary rate battery exceeds -20°C, the low-temperature high-rate battery stops supplying power to the electric heating wire, and the electricity generated by the car engine is simultaneously supplied to the ordinary rate battery and the low-temperature sodium ion battery.

[0021] The hybrid power supply of the present invention uses a low-temperature high-rate battery and a common rate battery in a mixed manner. In an ultra-low temperature environment, the low-temperature high-rate battery provides the starting power of the car, and in a normal environment, the common rate battery provides power for the car, so that the hybrid power supply can ensure the ignition of the car at low temperatures, and the CCA of the low-temperature high-rate battery at low temperatures can reach 2000-3000, so it can be applied to internal combustion engines above 8KW. Moreover, the low-temperature high-rate battery is used only when starting at low temperatures, so there is no need to set a larger capacity, and then, the volume of the hybrid power supply is almost unchanged from the volume of the vehicle battery in the prior art, and the conventional vehicle power supply is still provided by the common rate battery, which can also meet the normal operation of the vehicle. By using a bidirectional DC / DC, the formation of a circulation between the batteries is prevented, and the hybrid power supply is guaranteed to be safe and reliable. In addition, a photovoltaic power generation component is added as the power source of the two batteries. When the battery is overused in the parking situation, the battery can be charged without starting the vehicle, thereby avoiding the situation where the car cannot be started due to excessive use of the battery.

Claims

1. A new type of high-rate hybrid power supply with short-circuit protection, characterized in that: It includes a voltage conversion module, a common rate battery and a low temperature high rate battery; the low temperature high rate battery contains a short circuit protection module; the voltage conversion module contains a bidirectional DC / DC unit 1 and a bidirectional DC / DC unit 2, the front end of the bidirectional DC / DC unit 1 is connected to the interface 2, the rear end of the bidirectional DC / DC unit 1 is connected to the front end of the bidirectional DC / DC unit 2, and the rear end of the bidirectional DC / DC unit 1 is connected to the interface 3, and the rear end of the bidirectional DC / DC unit 2 is connected to the interface 1; the interface 1 is connected to the common rate battery; the interface 3 is used to connect to the photovoltaic power generation component to receive the electric energy generated by the photovoltaic power generation component; the interface 2 It is connected to the low-temperature and high-rate battery, and interface 2 is used to connect to automobile-related components, for providing power to automobile-related components or receiving power generated by automobile-related components; the short-circuit protection module includes a controllable switch located on the battery power supply circuit and a feedback network for driving the controllable switch to be turned on or off, the feedback network is connected to the circuit section between the controllable switch and the positive electrode of the battery, and is used to collect the circuit voltage; when a short circuit occurs in the load of the battery power supply circuit, causing the circuit voltage to increase, the feedback network controls the controllable switch to close; there is a current limiting rapid rise module on the circuit section between the circuit access point of the feedback network and the controllable switch, which is used to ensure that the controllable switch will not be damaged before being turned off.

2. The high-rate new hybrid power supply with short-circuit protection as claimed in claim 1, characterized in that: The ordinary rate battery is used to power automobile-related components or a low-temperature high-rate battery through interface one, bidirectional DC / DC unit two, bidirectional DC / DC unit one and interface two; the low-temperature high-rate battery is used to power automobile-related components through interface two; the electric energy generated by the automobile-related components is used to charge the low-temperature high-rate battery through interface two, and the electric energy generated by the automobile-related components is also used to charge the ordinary rate battery through interface two, bidirectional DC / DC unit one, bidirectional DC / DC unit two and connector one.

3. The high-rate new hybrid power supply with short-circuit protection as claimed in claim 1, characterized in that: The current limiting fast rise module includes an inductor L connected in series in the loop, and a reverse diode D1 is connected in parallel at both ends of the inductor L; the input end of the feedback network is connected to the upper end of the inductor L.

4. The high-rate novel hybrid power supply with short-circuit protection as claimed in claim 3, characterized in that: The controllable switch includes a MOS tube Q1 and a MOS tube Q2; the source of the MOS tube Q2 is connected to the lower end of the inductor L, the gate of the MOS tube Q2 is connected to the drive signal C+, the drain of the MOS tube Q2 is connected to the drain of the MOS tube Q1, and the source of the MOS tube Q1 is connected to the negative electrode of the battery; the output end of the feedback network is connected to the gate of the MOS tube Q1, and is used to generate a gate-connected drive signal D+. When a load of the battery power supply circuit is short-circuited, causing the circuit voltage to increase, the potential of the gate-connected drive signal D+ is reversed, and the MOS tube Q1 is turned off.

5. The high-rate novel hybrid power supply with short-circuit protection as claimed in claim 4, characterized in that: The feedback network includes a resistor R1, one end of which is connected to the upper end of the inductor L, and the other end of which is respectively connected to one end of the capacitor C1 and one end of the resistor R2, the other end of the capacitor C1 is grounded, and the other end of the resistor R2 is connected to the base of the transistor Q3; the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R4 is connected to the power supply VCC, and the other end of the resistor R6 generates the gate connection drive signal D+.

6. The high-rate new hybrid power supply with short-circuit protection as claimed in claim 1, characterized in that: The low-temperature and high-rate battery is a low-temperature sodium ion battery.

7. The high-rate novel hybrid power supply with short-circuit protection as claimed in claim 1, characterized in that: The normal rate battery is a normal rate lithium iron phosphate battery.

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