WO2021012219A1 - Charging and discharging circuit, vehicle-mounted charging and discharging system, and charging and discharging method - Google Patents

Abstract

Disclosed are a charging and discharging circuit, a vehicle-mounted charging and discharging system, and a charging and discharging method. The charging and discharging circuit comprises a rectifier circuit module, a voltage-regulating circuit module, a first battery pack, a second battery pack, a first switch, a second switch, a vehicle control unit, and a load, wherein the rectifier circuit module is connected in series to the voltage-regulating circuit module, the voltage-regulating circuit module is connected to the first battery pack, the first battery pack is connected to the load, the second battery pack is connected to the load and one end of the voltage-regulating circuit module by means of the second switch, the second battery pack is connected to the other end of the voltage-regulating circuit module by means of the first switch, and the voltage-regulating circuit module, the first battery pack, the first switch, the second switch and the second battery pack are all connected to the vehicle control unit. According to the embodiments of the present application, multiple battery packs are used in the charging and discharging circuit so as to realize the mixed use of different battery packs, so that a vehicle can obtain more power, thereby increasing the cruising range, facilitating the long-distance driving of a user, and bringing convenience to a user.

Description

Charging and discharging circuit, vehicle-mounted charging and discharging system and charging and discharging method Technical field

This application relates to the field of circuit design, in particular to a charging and discharging circuit, a vehicle-mounted charging and discharging system, and a charging and discharging method.

Background technique

In recent years, with the scarcity of energy and people’s awareness of the environment, more and more people choose to buy electric vehicles instead of traditional fuel vehicles, which are economical and environmentally friendly, but compared to traditional fuel vehicles, electric vehicles have a shorter cruising range And long charging time has always been a tricky problem. How to increase the cruising range of the whole vehicle, making the application of electric vehicles more extensive, has attracted widespread attention for a long time.

Summary of the invention

The embodiments of the present application provide a charging and discharging circuit, a vehicle-mounted charging and discharging system, and a charging and discharging method. The charging and discharging circuit adds multiple battery packs to enable the entire vehicle to obtain greater power, which can effectively increase the cruising range of electric vehicles and facilitate Long-distance travel for users brings convenience to users.

The first aspect of the embodiments of the application provides a charging and discharging circuit, which is applied to a vehicle charging and discharging system, and includes a rectifier circuit module, a voltage regulating circuit module, a first battery pack, a second battery pack, a first switch, a second switch, and a whole Vehicle controller, load, of which,

The rectifier circuit module is connected in series with the voltage regulating circuit module, the voltage regulating circuit module is connected to the first battery pack, the first battery pack is connected to the load, and the second battery pack passes through the second switch Connect the load and one end of the voltage regulating circuit module, the second battery pack is connected to the other end of the voltage regulating circuit module through the first switch, the voltage regulating circuit module and the first battery pack , The first switch, the second switch, and the second battery pack are all connected to the vehicle controller;

The first battery pack includes a first internal switch, and the second battery pack includes a second internal switch; the vehicle controller is used to control the first switch, the second switch, and the first internal switch And the second internal switch; the vehicle controller is also used to control the voltage conversion rate of the voltage regulating circuit module;

When the vehicle is in a charging state, the vehicle controller is used to control the first switch and the second switch to open, the first internal switch is closed, and the rectifier circuit module is used to convert alternating current to direct current To charge the first battery pack; or, the vehicle controller is used to control the first switch and the first internal switch to open, and the second switch and the second internal switch to close, The rectifier circuit module is used to convert alternating current to direct current to charge the second battery pack; when the vehicle is in a driving state, the vehicle controller is used to control the first switch and the second switch Open, the first internal switch is closed, so that the first battery pack alone supplies power to the load; or, the vehicle controller is used to control the first switch and the first internal switch to open , The second switch and the second internal switch are closed, so that the second battery pack alone supplies power to the load; or, the vehicle controller is used to control the second switch to open, and the The first switch, the first internal switch and the second internal switch are closed, and the voltage regulating circuit module is used to convert the voltage of the second battery pack to be the same as that of the first battery pack, so as to realize all The first battery pack and the second battery pack simultaneously supply power to the load.

In an embodiment, the charging and discharging circuit further includes a first pre-charging circuit module, wherein,

The first pre-charging circuit module is connected in series between the first switch and the voltage regulating circuit module, and the first pre-charging circuit module is connected to the vehicle controller;

When the first battery pack and the second battery pack simultaneously supply power to the load, the first pre-charging circuit module is used to protect the voltage regulating circuit module.

In an embodiment, the first pre-charging circuit module includes a first pre-charging resistor, a third switch, a first diode, and a second diode, wherein,

The first precharge resistor is connected in parallel with the third switch, one end of the first precharge resistor is connected to the second battery pack through the first switch, and the other end of the first precharge resistor is connected to the second battery pack. The anode of a diode, the cathode of the first diode is connected to the voltage regulating circuit module, the cathode of the second diode is connected to the second battery pack through the first switch, the first The anodes of the two diodes are connected to the voltage regulating circuit module.

In an embodiment, the voltage regulating circuit module includes a power factor control PFC circuit and a DC/DC circuit, wherein,

The power factor control PFC circuit is connected to the DC/DC circuit, the rectifier circuit module is connected in series with the power factor control PFC circuit, and the DC/DC circuit is connected to the first battery pack and passes through the second switch Connected to the second battery pack, the power factor control PFC circuit and the DC/DC circuit are connected to the vehicle controller;

The power factor control PFC circuit is used for power factor correction of the voltage, and the DC/DC circuit is used for adjusting the voltage value.

In an embodiment, the charge and discharge circuit further includes a second precharge circuit module, the second precharge circuit includes a second precharge resistor, a fourth switch, and a fifth switch, and the rectifier circuit module includes a rectifier bridge ,among them,

The second precharge resistor is connected to an external input power source, the second precharge resistor is also connected in parallel with the fourth switch and then connected to the fifth switch, and the fifth switch is connected to the rectifier bridge;

The second precharge resistor is used to protect the rectifier circuit module, and when the entire vehicle is in a charging state, the fifth switch is used to control the connection or disconnection of the charging circuit.

The second aspect of the embodiments of the present application also provides a vehicle-mounted charging and discharging system, which includes an input power source and the above-mentioned charging and discharging circuit, wherein:

The input power source is connected to the rectifier circuit module, the rectifier circuit module is connected in series with the voltage regulating circuit module, the voltage regulating circuit module is connected to the first battery pack, and the first battery pack is connected to the load. The second battery pack is connected to the load and one end of the voltage regulating circuit module through the second switch, and the second battery pack is connected to the other end of the voltage regulating circuit module through the first switch. The voltage regulating circuit module, the first battery pack, the first switch, the second switch, and the second battery pack are all connected to the vehicle controller;

The first battery pack includes a first internal switch, and the second battery pack includes a second internal switch; the vehicle controller is used to control the first switch, the second switch, and the first internal switch And the second internal switch; the input power supply supplies power to the first battery pack and the second battery pack, and the vehicle controller is also used to control the voltage conversion rate of the voltage regulating circuit module;

When the vehicle is in a charging state, the vehicle controller is used to control the first switch and the second switch to open, the first internal switch is closed, and the rectifier circuit module is used to connect the input power supply and switch AC power is converted to DC power to charge the first battery pack; or, the vehicle controller is used to control the first switch and the first internal switch to be turned off, and the second switch and the second switch The internal switch is closed, and the rectifier circuit module is used to connect the input power supply and convert alternating current to direct current to charge the second battery pack; when the vehicle is in the driving state, the vehicle controller is used to control the The first switch and the second switch are opened, and the first internal switch is closed, so that the first battery pack alone supplies power to the load; or, the vehicle controller is used to control the first The switch and the first internal switch are disconnected, and the second switch and the second internal switch are closed, so that the second battery pack alone supplies power to the load; or, the vehicle controller is used to control The second switch is off, the first switch, the first internal switch, and the second internal switch are closed, and the voltage regulating circuit module is used to convert the voltage of the second battery pack The first battery pack is the same, so that the first battery pack and the second battery pack simultaneously supply power to the load.

The third aspect of the embodiments of the present application also provides a charging method, which is applied to the above-mentioned vehicle charging and discharging system, and the method includes:

When it is detected that the whole vehicle is in a charging state, the charging requirements of the first battery pack and the second battery pack are determined. The first battery pack includes a first internal switch, and the second battery pack includes a second internal switch. switch;

Controlling the rectifying circuit module and the voltage regulating circuit module to adjust the charging voltage to a preset charging voltage according to the charging demand;

Controlling the first internal switch and the second internal switch and the second switch and the first switch to charge the first battery pack or the second battery pack.

In one embodiment, the control of the first internal switch and the second internal switch, as well as the second switch and the first switch, is performed on the first battery pack or the second battery pack Charging, including:

When the first battery pack has a charging demand, open the first switch and the second switch, close the first internal switch, and charge the first battery pack;

When the second battery pack has a charging demand, the first switch and the first internal switch are opened, the second switch and the second internal switch are closed, and the second battery pack is charged ；

When both the first battery pack and the second battery pack have charging requirements, the first battery pack or the second battery pack is charged according to a preset strategy, and the preset strategy includes a preset strategy The order of charging or the battery packs with better performance detected shall be charged first.

The fourth aspect of the embodiments of the present application also provides a discharging method, which is applied to the above-mentioned vehicle charging and discharging system, and the method includes:

When detecting the power supply requirement of the load, detecting the power of the first battery pack and the second battery pack;

The first battery pack and/or the second battery pack are controlled to supply power to the load according to the electric quantity, the first battery pack includes a first internal switch, and the second battery pack includes a second internal switch.

In an embodiment, the controlling the first battery pack and/or the second battery pack to supply power to the load according to the electric quantity includes:

When the power of the first battery pack is greater than the preset power and the power of the second battery pack is less than the preset power, the first switch and the second switch are opened, and the first internal switch is closed, Controlling the first battery pack to supply power to the load, and the preset amount of power is the minimum amount of power to supply power to the load;

When the power of the first battery pack is less than the preset power, and the power of the second battery pack is greater than the preset power, the first switch and the first internal switch are opened, and the A second switch and the second internal switch to control the second battery pack to supply power to the load;

When the power of the first battery pack and the second battery pack is greater than the preset power, the second switch is opened, and the first switch, the first internal switch and the first switch are closed. Two internal switches to control the first battery pack and the second battery pack to simultaneously supply power to the load.

In this application, the charging and discharging circuit is applied to the vehicle charging and discharging system, including a rectifier circuit module, a voltage regulating circuit module, a first battery pack, a second battery pack, a first switch, a second switch, a vehicle controller, and a load, Wherein, the rectifier circuit module is connected in series with the voltage regulating circuit module, the voltage regulating circuit module is connected to the first battery pack, the first battery pack is connected to the load, and the second battery pack passes through the first battery pack. Two switches are connected to the load and one end of the voltage regulating circuit module, the second battery pack is connected to the voltage regulating circuit module through the first switch, and the other end of the voltage regulating circuit module is connected to the first The battery pack, the first switch, the second switch, and the second battery pack are all connected to the vehicle controller; the first battery pack includes a first internal switch, and the second battery pack includes a Two internal switches; the vehicle controller is used to control the first switch, the second switch, the first internal switch, and the second internal switch; the vehicle controller is also used to control the The voltage conversion rate of the voltage regulating circuit module; when the entire vehicle is in a charging state, the vehicle controller is used to control the first switch and the second switch to open, the first internal switch to close, and the rectifier The circuit module is used to convert alternating current to direct current to charge the first battery pack; or, the vehicle controller is used to control the first switch and the first internal switch to turn off, and the second switch And the second internal switch is closed, the rectifier circuit module is used to convert alternating current to direct current to charge the second battery pack; when the vehicle is in the driving state, the vehicle controller is used to control the The first switch and the second switch are opened, and the first internal switch is closed, so that the first battery pack alone supplies power to the load; or, the vehicle controller is used to control the first switch And the first internal switch is disconnected, and the second switch and the second internal switch are closed, so that the second battery pack alone supplies power to the load; or, the vehicle controller is used to control the The second switch is off, the first switch, the first internal switch, and the second internal switch are closed, and the voltage regulating circuit module is used to convert the voltage of the second battery pack to follow the The first battery pack is the same, so that the first battery pack and the second battery pack simultaneously supply power to the load. It can be seen that multiple battery packs are used in the charging and discharging circuit in this application, which can realize the charging of multiple battery packs, so that the whole vehicle can obtain greater power, and can realize the simultaneous discharge of multiple battery packs through the voltage regulating circuit module, realizing different battery packs The mixed use of, increases the cruising range, facilitates long-distance driving, and brings convenience to users.

These and other aspects of the application will be more concise and understandable in the description of the following embodiments.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the application or the background art, the following will briefly introduce the drawings involved in the embodiments of the application or the background art.

The following will briefly introduce the drawings involved in the embodiments of the present application.

FIG. 1 is a schematic structural diagram of a charging and discharging circuit provided by an embodiment of the present application;

2 is a schematic structural diagram of another charging and discharging circuit provided by an embodiment of the present application;

3 is a schematic structural diagram of another charging and discharging circuit provided by an embodiment of the present application;

4 is a schematic diagram of a vehicle-mounted charging and discharging system provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a charging method provided by an embodiment of the present application;

FIG. 6 is a schematic flowchart of a discharging method provided by an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the application, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

Detailed descriptions are given below.

The terms "first", "second", "third" and "fourth" in the description and claims of the application and the drawings are used to distinguish different objects, rather than describing a specific order . In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.

Reference to "embodiments" herein means that a specific feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art clearly and implicitly understand that the embodiments described herein can be combined with other embodiments.

Among the commonly used pure electric vehicles, the most influencing electric vehicle is the replacement or charging of batteries. Normal electric vehicles use a single battery pack. The mains input charges the single battery pack through a rectifier current and a voltage regulating circuit. When the vehicle load has a power supply demand, the single battery pack provides power to the load. The existing vehicle battery charging and discharging method can only realize the function of charging a single battery pack, cannot realize the mixed use of different battery packs, has a short cruising range, is not convenient for users to travel long distances, and cannot bring convenience to users.

In view of the foregoing problems, embodiments of the present application propose a charging and discharging circuit, an on-board charging and discharging system, and a charging and discharging method. The charging and discharging circuit is applied to the on-board charging and discharging system and includes a rectifier circuit module, a voltage regulating circuit module, and a first battery. Package, second battery package, first switch, second switch, vehicle controller and load, among which,

The rectifier circuit module is connected in series with the voltage regulating circuit module, the voltage regulating circuit module is connected to the first battery pack, the first battery pack is connected to the load, and the second battery pack passes through the second switch The load is connected to one end of the voltage regulating circuit module, the second battery pack is connected to the voltage regulating circuit module through the first switch, and the other end of the voltage regulating circuit module is connected to the first battery pack , The first switch, the second switch, and the second battery pack are all connected to the vehicle controller; the first battery pack includes a first internal switch, and the second battery pack includes a second internal switch. Switch; the vehicle controller is used to control the first switch, the second switch, the first internal switch, and the second internal switch; the vehicle controller is also used to control the voltage regulation The voltage conversion rate of the circuit module; when the vehicle is in a charging state, the vehicle controller is used to control the first switch and the second switch to open, the first internal switch is closed, and the rectifier circuit module Used to convert alternating current to direct current to charge the first battery pack; or, the vehicle controller is used to control the first switch and the first internal switch to turn off, and the second switch and the The second internal switch is closed, and the rectifier circuit module is used to convert alternating current to direct current to charge the second battery pack; when the vehicle is in a driving state, the vehicle controller is used to control the first The switch and the second switch are disconnected, and the first internal switch is closed, so that the first battery pack alone supplies power to the load; or, the vehicle controller is used to control the first switch and the The first internal switch is open, and the second switch and the second internal switch are closed, so that the second battery pack alone supplies power to the load; or, the vehicle controller is used to control the first The second switch is open, the first switch, the first internal switch, and the second internal switch are closed, and the voltage regulating circuit module is used to convert the voltage of the second battery pack to follow the first The battery packs are the same, so that the first battery pack and the second battery pack simultaneously supply power to the load. It can be seen that multiple battery packs are used in the charging and discharging circuit in this application, which can realize the charging of multiple battery packs, so that the whole vehicle can obtain greater power, and can realize the simultaneous discharge of multiple battery packs through the voltage regulating circuit module, realizing different battery packs The mixed use of, increases the cruising range, facilitates long-distance driving, and brings convenience to users.

The embodiments of the present application are described below in conjunction with the drawings.

Please refer to FIG. 1, which is a schematic diagram of a charging and discharging circuit provided by an embodiment of the present application. The charging and discharging circuit 100 is applied to a vehicle charging and discharging system and includes a rectifier circuit module 110, a voltage regulating circuit module 120, and a first battery pack 130. The second battery pack 140, the first switch 150, the second switch 160, the vehicle controller 170, and the load 200, wherein:

The rectifier circuit module 110 is connected in series with the voltage regulating circuit module 120, the voltage regulating circuit module 120 is connected to the first battery pack 130, the first battery pack 130 is connected to the load 200, and the second battery pack 140 is connected to the load 200 and one end of the voltage regulating circuit module 120 through the second switch 160, and the second battery pack 140 is connected to the other end of the voltage regulating circuit module 120 through the first switch 150, The voltage regulating circuit module 120, the first battery pack 130, the first switch 150, the second switch 160, and the second battery pack 140 are all connected to the vehicle controller 170;

The first battery pack 130 includes a first internal switch, and the second battery pack 140 includes a second internal switch; the vehicle controller 170 is used to control the first switch 150, the second switch 160, The first internal switch and the second internal switch; the vehicle controller 170 is also used to control the voltage conversion rate of the voltage regulating circuit module 120;

When the vehicle is in a charging state, the vehicle controller 170 is used to control the first switch 150 and the second switch 160 to open, the first internal switch is closed, and the rectifier circuit module 110 is used for Convert AC power to DC power to charge the first battery pack 130; or, the vehicle controller 170 is used to control the first switch 150 and the first internal switch to be turned off, and the second switch 160 and the second internal switch are closed, and the rectifier circuit module 110 is used to convert alternating current to direct current to charge the second battery pack 140; when the vehicle is in the driving state, the vehicle controller 170 Used to control the opening of the first switch 150 and the second switch 160, and the first internal switch to close, so that the first battery pack 130 alone supplies power to the load 200; or, the vehicle The controller 170 is used to control the first switch 150 and the first internal switch to open, and the second switch 160 and the second internal switch to close, so as to realize that the second battery pack 140 is the The load 200 supplies power; or, the vehicle controller 170 is used to control the second switch 160 to open, the first switch 150, the first internal switch and the second internal switch are closed, and the adjustment The voltage circuit module 120 is used to convert the voltage of the second battery pack 140 to be the same as that of the first battery pack 130, so as to realize that the first battery pack 130 and the second battery pack 140 serve as the load at the same time. 200 power supply.

Wherein, the second battery pack is an additional battery pack, and its capacity may be different from the capacity of the first battery pack, and the second battery pack may also be exactly the same as the first battery pack, so it is different When charging the battery pack, the voltage regulating module adjusts the charging voltage of different battery packs; and when the first battery pack and the second battery pack have charging requirements, the first battery pack is charged according to a preset strategy One battery pack or the second battery pack is charged, and the preset strategy may include, but is not limited to, a preset charging sequence, or preferential charging of battery packs with better performance detected.

It can be seen that in this example, by adding the second battery pack 140, different battery packs can be charged, so that the whole vehicle can obtain more power, and it can realize the separate discharge of different battery packs and the simultaneous discharge of multiple battery packs through the voltage regulating circuit module 120. , Realizing the mixed use of different battery packs, increasing the cruising range.

As a possible implementation manner, please refer to FIG. 2. FIG. 2 is a schematic diagram of a charging and discharging circuit provided by an embodiment of the application. The charging and discharging circuit further includes a first pre-charging circuit module 180, wherein:

The first pre-charging circuit module 180 is connected in series between the first switch 150 and the voltage regulating circuit module 120, and the first pre-charging circuit module 180 is connected to the vehicle controller 170;

When the first battery pack 130 and the second battery pack 140 supply power to the load 200 at the same time, the first pre-charging circuit module 180 is used to protect the voltage regulating circuit module 120.

Among them, one end of the first pre-charging circuit module 180 is connected to the second battery pack 140 through the first switch 150, and the second battery pack 140 is connected to the load through the second switch 160; the other end of the first pre-charging circuit module 180 is connected to the voltage regulator. The circuit module 120 and the rectifier circuit module 110 are connected to the second pre-charging circuit module 190, and the voltage regulating circuit module 120 is connected to the first battery pack 130 and the load 200. When the second battery pack 140 and the first battery pack 130 supply power to the load 200 at the same time, and the first switch 150 is closed, the circuit is precharged by the first precharge circuit module 180 first.

It can be seen that in this example, the first pre-charging circuit module 180 is connected in series between the second battery pack 140 and the voltage regulating circuit module 120 to prevent the moment when the first switch 150 is closed and the second battery pack is discharged when the whole vehicle is in the charging state. The current causes damage to the voltage regulating circuit module 120 and the rectifying circuit module 110.

As a possible implementation manner, please refer to FIG. 3, which is a schematic structural diagram of a charging and discharging circuit. The first precharge circuit module 180 includes a first precharge resistor 181, a third switch 182, and a second Pole tube 183 and second diode 184, among which,

The first precharge resistor 181 is connected in parallel with the third switch 182, one end of the first precharge resistor 181 is connected to the second battery pack 140 through the first switch 150, and the first precharge resistor 181 The other end is connected to the anode of the first diode 183, the cathode of the first diode 183 is connected to the voltage regulating circuit module 120, and the cathode of the second diode 184 passes through the first switch 150. The second battery pack 140 is connected, and the anode of the second diode 184 is connected to the voltage regulating circuit module 120.

One end of the first precharge resistor 181 is connected to the first switch 150 and then connected to the second battery pack 140, and the other end of the first precharge resistor 181 is connected to the anode of the first diode 183; the cathode of the second diode 184 passes through The first switch 150 is connected to the second battery pack 140.

Wherein, the first switch 150 and the second switch 160 may be single-pole switches or double-pole switches, as shown in FIG. 3, the first switch 150 and the second switch 160 are double-pole switches, and the first switch 150 includes K7 and K8, and the second switch 160 includes K9 and K10.

When the entire vehicle is in a driving state and the second battery pack 140 and the first battery pack 130 are simultaneously supplying power to the load 200, the first switch 150 is first closed to complete the precharging, and then the third switch 182 is closed.

It can be seen that, in this example, when the vehicle is in the driving state, the first pre-charging circuit 180 prevents the first switch 150 from being closed and the discharge current of the second battery pack 140 causes damage to the voltage regulating circuit module 120 and the rectifying circuit module 110; The cathode of the second diode 184 is connected to the second battery pack 140 through the first switch 150 to avoid reverse connection of the second battery pack 140 to protect the circuit, and the circuit is simple, low in cost, and small in space.

As a possible implementation manner, please refer to FIG. 3. The voltage regulating circuit module 120 includes a power factor control PFC circuit 121 and a DC/DC circuit 122, where:

The power factor control PFC circuit 121 is connected to the DC/DC circuit 122, the rectifier circuit module 110 is connected in series to the power factor control PFC circuit 121, and the DC/DC circuit 122 is connected to the first battery pack 130, and The second battery pack 140 is connected through the second switch 160, and the power factor control PFC circuit 121 and the DC/DC circuit 122 are connected to the vehicle controller 170;

The power factor control PFC circuit 121 is used for power factor correction of voltage, and the DC/DC circuit 122 is used for adjusting the voltage value.

When the entire vehicle is in a charging state, the vehicle controller 170 controls the power factor control PFC circuit 121 and the DC/DC circuit 122 to adjust the charging voltage to adapt to the charging voltage of the first battery pack 130 or the second battery pack 140. When the vehicle is in a discharging state, the vehicle controller 170 controls the power factor control PFC circuit 121 and the DC/DC circuit 122 to adjust the charging voltage so that the voltage range and other parameters of the second battery pack 140 are the same as those of the first battery pack 130. Load power supply.

It can be seen that in this example, adjusting the charging voltage or the discharging voltage of the second battery pack 140 through the power factor control PFC circuit 121 and the DC/DC circuit 122 can charge multiple different battery packs, increase the battery power of the entire vehicle, and It can discharge different battery packs at the same time, realize the mixed use of different battery packs, and increase the cruising range.

As a possible implementation manner, please refer to FIG. 3, the charging and discharging circuit further includes a second precharging circuit module 190, the second precharging circuit module 190 is connected to the vehicle controller 170, and the second The precharge circuit module 190 includes a second precharge resistor 191, a fourth switch 192, and a fifth switch 193. The rectifier circuit module 110 includes a rectifier bridge 111, wherein,

The second precharge resistor 191 is used to connect an external input power source, the second precharge resistor 191 is also connected in parallel with the fourth switch 192 and then connected to the fifth switch 193, and the fifth switch 193 is connected to the rectifier Bridge 111;

The second precharge resistor 191 is used to protect the rectifier circuit module 110, and when the entire vehicle is in a charging state, the fifth switch 193 is used to control the connection or disconnection of the charging circuit.

Wherein, the second pre-charging circuit module 190 is connected to the detection circuit 400, and the detection circuit 400 is used to detect the charging circuit voltage. When the whole vehicle is in the charging state, first close the fourth switch 192, and then close the fifth switch 193 after the pre-charging is completed; realize multiple battery packs to supply power to the load 200 at the same time, and control the connection or disconnection of the charging circuit through the fifth switch 193 .

It can be seen that, in this example, when the entire vehicle is in a charging state, the second pre-charging circuit module is used to prevent the rectifier circuit module 110 from being damaged by the charging current of the input power at the moment when the fifth switch 193 is closed.

An embodiment of the present application also provides a vehicle-mounted charging and discharging system. Please refer to FIG. 4. FIG. 4 is a schematic diagram of the vehicle-mounted charging and discharging system.

The input power source 300 is connected to the rectifier circuit module 110, the rectifier circuit module 110 is connected in series with the voltage regulating circuit module 120, and the voltage regulating circuit module 120 is connected to the first battery pack 130. The first battery pack 130 is connected to the load 200, the second battery pack 140 is connected to the load 200 and one end of the voltage regulating circuit module 120 through the second switch 160, and the second battery pack 140 is connected through the first switch. 150 is connected to the other end of the voltage regulating circuit module 120, the voltage regulating circuit module 120, the first battery pack 130, the first switch 150, the second switch 160, and the second battery pack 140 Are connected to the vehicle controller 170;

The first battery pack 130 includes a first internal switch, and the second battery pack 140 includes a second internal switch; the vehicle controller 170 is used to control the first switch 150, the second switch 160, The first internal switch and the second internal switch; the input power source 300 supplies power to the first battery pack 130 and the second battery pack 140, and the vehicle controller 170 is also used to control the The voltage conversion rate of the voltage regulating circuit module 120;

When the vehicle is in a charging state, the vehicle controller 170 is used to control the first switch 150 and the second switch 160 to open, the first internal switch is closed, and the rectifier circuit module 110 is used for Connect the input power source 300 and convert AC power to DC power to charge the first battery pack 130; or, the vehicle controller 170 is used to control the first switch 150 and the first internal switch to be turned off, The second switch 160 and the second internal switch are closed, and the rectifier circuit module 110 is used to connect the input power supply 300 and convert alternating current to direct current to charge the second battery pack 140; When in the driving state, the vehicle controller 170 is used to control the first switch 150 and the second switch 160 to open, and the first internal switch to close, so that the first battery pack 130 alone The load 200 provides power; or, the vehicle controller 170 is used to control the first switch 150 and the first internal switch to be disconnected, and the second switch 160 and the second internal switch to be closed to Realizing that the second battery pack 140 alone supplies power to the load 200; or, the vehicle controller 170 is used to control the second switch 160 to be turned off, and the first switch 150 and the first internal switch When the second internal switch is closed, the voltage regulating circuit module 120 is used to convert the voltage of the second battery pack 140 to be the same as that of the first battery pack 130, so as to realize that the first battery pack 130 and The second battery pack 140 simultaneously supplies power to the load 200.

An embodiment of the present application also provides a charging method. Please refer to FIG. 5. FIG. 5 is a schematic flowchart of the charging method. As shown in the figure, the charging method is applied to the above-mentioned vehicle charging and discharging system, and the method includes:

S501: When it is detected that the whole vehicle is in a charging state, determine the charging requirements of the first battery pack and the second battery pack, the first battery pack includes a first internal switch, and the second battery pack includes a first battery pack. Two internal switches;

S502, controlling the rectifying circuit module and the voltage regulating circuit module to adjust the charging voltage to a preset charging voltage according to the charging demand;

S503: Control the first internal switch and the second internal switch, and the second switch and the first switch to charge the first battery pack or the second battery pack.

In a possible example, the control of the first internal switch and the second internal switch, as well as the second switch and the first switch, is for the first battery pack or the second battery pack To charge, including:

When the first battery pack has a charging demand, open the first switch and the second switch, close the first internal switch, and charge the first battery pack;

When the second battery pack has a charging demand, the first switch and the first internal switch are opened, the second switch and the second internal switch are closed, and the second battery pack is charged ；

When both the first battery pack and the second battery pack have charging requirements, the first battery pack or the second battery pack is charged according to a preset strategy, and the preset strategy includes a preset strategy The order of charging or the battery packs with better performance detected shall be charged first.

An embodiment of the present application also provides a discharge method. Please refer to FIG. 6. FIG. 6 is a schematic flowchart of the discharge method. As shown in the figure, the discharge method is applied to the above-mentioned on-board charging and discharging system, and the method includes:

S601: When the power supply requirement of the load is detected, detect the power of the first battery pack and the second battery pack;

S602. Control the first battery pack and/or the second battery pack to supply power to the load according to the electric quantity, the first battery pack includes a first internal switch, and the second battery pack includes a second internal switch. switch.

In a possible example, the controlling the first battery pack and/or the second battery pack to supply power to the load according to the electric quantity includes:

When the power of the first battery pack is greater than the preset power and the power of the second battery pack is less than the preset power, the first switch and the second switch are opened, and the first internal switch is closed, Controlling the first battery pack to supply power to the load, and the preset amount of power is the minimum amount of power to supply power to the load;

When the power of the first battery pack is less than the preset power, and the power of the second battery pack is greater than the preset power, the first switch and the first internal switch are opened, and the A second switch and the second internal switch to control the second battery pack to supply power to the load;

When the power of the first battery pack and the second battery pack is greater than the preset power, the second switch is opened, and the first switch, the first internal switch and the first switch are closed. Two internal switches to control the first battery pack and the second battery pack to simultaneously supply power to the load.

It should be noted that for the foregoing application embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that this application is not limited by the described sequence of actions. Because according to this application, some steps can be performed in other order or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

In the above-mentioned embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in an embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed device may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the above-mentioned units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated To another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.

The units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

The embodiments of the application are described in detail above, and specific examples are used in this article to illustrate the principles and implementation of the application. The descriptions of the above embodiments are only used to help understand the application and its core ideas; at the same time, for the field According to the ideas of the application, the general technical personnel of, will have changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as a limitation of the application.

Claims (10)

1. A charging and discharging circuit, characterized in that it comprises a rectifier circuit module, a voltage regulating circuit module, a first battery pack, a second battery pack, a first switch, a second switch, a vehicle controller, and a load, wherein:

   The rectifier circuit module is connected in series with the voltage regulating circuit module, the voltage regulating circuit module is connected to the first battery pack, the first battery pack is connected to the load, and the second battery pack passes through the second switch Connect the load and one end of the voltage regulation circuit module, the second battery pack is connected to the other end of the voltage regulation circuit module through the first switch, the voltage regulation circuit module and the first battery pack , The first switch, the second switch, and the second battery pack are all connected to the vehicle controller;

   The first battery pack includes a first internal switch, and the second battery pack includes a second internal switch; the vehicle controller is used to control the first switch, the second switch, and the first internal switch And the second internal switch; the vehicle controller is also used to control the voltage conversion rate of the voltage regulating circuit module;

   When the vehicle is in a charging state, the vehicle controller is used to control the first switch and the second switch to open, the first internal switch is closed, and the rectifier circuit module is used to convert alternating current to direct current To charge the first battery pack; or, the vehicle controller is used to control the first switch and the first internal switch to open, and the second switch and the second internal switch to close, The rectifier circuit module is used to convert alternating current to direct current to charge the second battery pack; when the vehicle is in a driving state, the vehicle controller is used to control the first switch and the second switch Open, the first internal switch is closed, so that the first battery pack alone supplies power to the load; or, the vehicle controller is used to control the first switch and the first internal switch to open , The second switch and the second internal switch are closed, so that the second battery pack alone supplies power to the load; or, the vehicle controller is used to control the second switch to open, and the The first switch, the first internal switch and the second internal switch are closed, and the voltage regulating circuit module is used to convert the voltage of the second battery pack to be the same as that of the first battery pack, so as to realize all The first battery pack and the second battery pack simultaneously supply power to the load.
2. The charging and discharging circuit according to claim 1, wherein the charging and discharging circuit further comprises a first pre-charging circuit module, wherein:

   The first pre-charging circuit module is connected in series between the first switch and the voltage regulating circuit module, and the first pre-charging circuit module is connected to the vehicle controller;

   When the first battery pack and the second battery pack simultaneously supply power to the load, the first pre-charging circuit module is used to protect the voltage regulating circuit module.
3. The charging and discharging circuit according to claim 2, wherein the first precharging circuit module includes a first precharging resistor, a third switch, a first diode, and a second diode, wherein:

   The first precharge resistor is connected in parallel with the third switch, one end of the first precharge resistor is connected to the second battery pack through the first switch, and the other end of the first precharge resistor is connected to the second battery pack. The anode of a diode, the cathode of the first diode is connected to the voltage regulating circuit module, the cathode of the second diode is connected to the second battery pack through the first switch, the first The anodes of the two diodes are connected to the voltage regulating circuit module.
4. The charging and discharging circuit according to any one of claims 1-3, wherein the voltage regulating circuit module includes a power factor control PFC circuit and a DC/DC circuit, wherein,

   The power factor control PFC circuit is connected to the DC/DC circuit, the rectifier circuit module is connected in series with the power factor control PFC circuit, and the DC/DC circuit is connected to the first battery pack and passes through the second switch Connected to the second battery pack, the power factor control PFC circuit and the DC/DC circuit are connected to the vehicle controller;

   The power factor control PFC circuit is used for power factor correction of the voltage, and the DC/DC circuit is used for adjusting the voltage value.
5. The charging and discharging circuit according to claim 4, wherein the charging and discharging circuit further comprises a second precharging circuit module, the second precharging circuit module is connected to the vehicle controller, and the second precharging circuit The charging circuit module includes a second precharge resistor, a fourth switch, and a fifth switch, and the rectifier circuit module includes a rectifier bridge, wherein,

   The second precharge resistor is connected to an external input power source, the second precharge resistor is also connected in parallel with the fourth switch and then connected to the fifth switch, and the fifth switch is connected to the rectifier bridge;

   The second precharge resistor is used to protect the rectifier circuit module, and when the entire vehicle is in a charging state, the fifth switch is used to control the connection or disconnection of the charging circuit.
6. A vehicle-mounted charging and discharging system, comprising an input power source, and further comprising the charging and discharging circuit according to any one of claims 1-5, wherein:

   The input power source is connected to the rectifier circuit module, the rectifier circuit module is connected in series with the voltage regulating circuit module, the voltage regulating circuit module is connected to the first battery pack, and the first battery pack is connected to the load. The second battery pack is connected to the load and one end of the voltage regulating circuit module through the second switch, and the second battery pack is connected to the other end of the voltage regulating circuit module through the first switch. The voltage regulating circuit module, the first battery pack, the first switch, the second switch, and the second battery pack are all connected to the vehicle controller;

   The first battery pack includes a first internal switch, and the second battery pack includes a second internal switch; the vehicle controller is used to control the first switch, the second switch, and the first internal switch And the second internal switch; the input power supply supplies power to the first battery pack and the second battery pack, and the vehicle controller is also used to control the voltage conversion rate of the voltage regulating circuit module;

   When the vehicle is in a charging state, the vehicle controller is used to control the first switch and the second switch to open, the first internal switch is closed, and the rectifier circuit module is used to connect the input power AC power is converted to DC power to charge the first battery pack; or, the vehicle controller is used to control the first switch and the first internal switch to be turned off, and the second switch and the second switch The internal switch is closed, and the rectifier circuit module is used to connect the input power supply and convert alternating current to direct current to charge the second battery pack; when the vehicle is in the driving state, the vehicle controller is used to control the The first switch and the second switch are opened, and the first internal switch is closed, so that the first battery pack alone supplies power to the load; or, the vehicle controller is used to control the first The switch and the first internal switch are disconnected, and the second switch and the second internal switch are closed, so that the second battery pack alone supplies power to the load; or, the vehicle controller is used to control The second switch is off, the first switch, the first internal switch, and the second internal switch are closed, and the voltage regulating circuit module is used to convert the voltage of the second battery pack into a The first battery pack is the same, so that the first battery pack and the second battery pack simultaneously supply power to the load.
7. A charging method, characterized in that it is applied to the on-board charging and discharging system of claim 6, the method comprising:

   When it is detected that the whole vehicle is in a charging state, the charging requirements of the first battery pack and the second battery pack are determined. The first battery pack includes a first internal switch, and the second battery pack includes a second internal switch. switch;

   Controlling the rectifying circuit module and the voltage regulating circuit module to adjust the charging voltage to a preset charging voltage according to the charging demand;

   Controlling the first internal switch and the second internal switch and the second switch and the first switch to charge the first battery pack or the second battery pack.
8. The method according to claim 7, wherein the controlling the first internal switch and the second internal switch, the second switch and the first switch, or the first battery pack The charging of the second battery pack includes:

   When the first battery pack has a charging demand, open the first switch and the second switch, close the first internal switch, and charge the first battery pack;

   When the second battery pack has a charging demand, the first switch and the first internal switch are opened, the second switch and the second internal switch are closed, and the second battery pack is charged ；

   When both the first battery pack and the second battery pack have charging requirements, the first battery pack or the second battery pack is charged according to a preset strategy, and the preset strategy includes a preset strategy The order of charging or the battery packs with better performance detected shall be charged first.
9. A discharge method, characterized in that it is applied to the on-board charging and discharging system of claim 6, and the method comprises:

   When detecting the power supply requirement of the load, detecting the power of the first battery pack and the second battery pack;

   The first battery pack and/or the second battery pack are controlled to supply power to the load according to the electric quantity, the first battery pack includes a first internal switch, and the second battery pack includes a second internal switch.
10. The method according to claim 9, wherein the controlling the first battery pack and/or the second battery pack to supply power to the load according to the electric quantity comprises:

    When the power of the first battery pack is greater than the preset power and the power of the second battery pack is less than the preset power, the first switch and the second switch are opened, and the first internal switch is closed, Controlling the first battery pack to supply power to the load, and the preset amount of power is the minimum amount of power to supply power to the load;

    When the power of the first battery pack is less than the preset power, and the power of the second battery pack is greater than the preset power, the first switch and the first internal switch are opened, and the A second switch and the second internal switch to control the second battery pack to supply power to the load;

    When the power of the first battery pack and the second battery pack is greater than the preset power, the second switch is opened, and the first switch, the first internal switch and the first switch are closed. Two internal switches to control the first battery pack and the second battery pack to simultaneously supply power to the load.

Images