WO2024077422A1

WO2024077422A1 - Charging control method and apparatus, device, computer-readable storage medium, and program

Info

Publication number: WO2024077422A1
Application number: PCT/CN2022/124182
Authority: WO
Inventors: 张传辉; 李宝; 尹丰
Original assignee: 宁德时代(上海)智能科技有限公司
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2024-04-18

Abstract

The present application discloses a charging control method and apparatus, a computer-readable storage medium, and a program. After an electrical device is connected to a charging device, before a charging parameter configuration stage, the maximum output voltage of the charging device is obtained first, and then according to the maximum output voltage, it is determined whether to directly charge a battery by using a voltage outputted by the electrical device, or to charge the battery after the voltage outputted by the electrical device is boosted, thereby automatically adapting to charging devices of all output voltage ranges. The additional operations of manually performing determination on a charging device and selecting a charging mode in advance are avoided, and thus, the charging speed and efficiency are improved.

Description

Charging control method, device, equipment, computer readable storage medium and program

Technical Field

The present application relates to the field of new energy technology, and more specifically, to a charging control method, device, equipment, computer-readable storage medium and program.

Background technique

With the development of the new energy industry, many devices are powered by batteries. For example, vehicles can use the power in the battery to provide energy for the motor to drive the vehicle. The battery power is mainly injected by external charging equipment.

With the widespread use of electrical devices, users have put forward higher and higher requirements on the charging speed and efficiency of electrical devices. In order to improve the charging speed and efficiency of electrical devices, a new charging control method for electrical devices is needed.

Summary of the invention

The present application provides a charging control method, apparatus, device, computer-readable storage medium and program, which can select a suitable charging mode for charging according to the maximum output voltage of the charging device, thereby improving the charging speed and efficiency.

In a first aspect, a control method for direct current charging of an electric device is provided, comprising:

After the charging interface of the electric device is connected to the charging device, the maximum output voltage of the charging device is obtained;

The battery of the power-consuming device is directly charged and/or boosted according to the maximum output voltage.

Through the control method for DC charging of electrical equipment provided in this embodiment, after the electrical equipment is connected to the charging equipment and before the charging parameter configuration stage, the maximum output voltage of the charging equipment is first obtained, and then it is determined based on the maximum output voltage whether to use the voltage output by the electrical equipment to directly charge the battery, or to charge the battery after boosting the voltage output by the electrical equipment, thereby realizing a charging device that automatically adapts to all output voltage ranges, avoiding the extra operation of manually identifying the charging equipment and selecting the charging method in advance, and thereby improving the charging speed and efficiency.

As a possible implementation method, the maximum output voltage of the charging device is obtained, including:

Before the charging parameter configuration stage of the electric device, the maximum output voltage of the charging device is obtained through the voltage acquisition device set in the charging pile interface.

Through the technical solution of this implementation method, the maximum output voltage of the charging device can be collected.

As a possible implementation, directly charging and/or boosting charging of a battery of an electric device according to a maximum output voltage includes:

Acquire a first voltage threshold of the electric device, wherein the first voltage threshold is greater than or equal to a maximum battery voltage of the electric device;

comparing the maximum output voltage to a first voltage threshold;

When it is determined that the maximum output voltage is greater than or equal to the first voltage threshold, directly charging the battery of the power-consuming device using the voltage output by the charging device during the charging phase;

When it is determined that the maximum output voltage is less than the first voltage threshold, the battery of the power-consuming device is charged after the voltage output by the charging device is boosted during the charging phase.

Through the technical solution of this implementation method, when the maximum output voltage is greater than or equal to the first voltage threshold, the voltage output by the charging device is directly injected into the battery of the power-consuming device without the need for voltage boosting. When charging in this way, there is no need to use a motor for voltage conversion, that is, there is no need for voltage boosting, thereby avoiding the power loss caused by voltage conversion, making the charging efficiency higher, and also saving the time required for voltage conversion, that is, increasing the charging speed. When the maximum output voltage of the charging device is less than the first voltage threshold, the voltage output by the charging device is first boosted and then injected into the battery, that is, the battery is boosted and charged, thereby solving the problem of being unable to charge the battery and unable to fully charge the battery.

Acquire a second voltage threshold and a third voltage threshold of the electric device, wherein the second voltage threshold is greater than or equal to a current battery voltage of the electric device, and the third voltage threshold is greater than or equal to a maximum battery voltage of the electric device;

comparing the maximum output voltage with the second voltage threshold and the third voltage threshold respectively;

When it is determined that the maximum output voltage is greater than or equal to a third voltage threshold, directly charging the battery of the power-consuming device using the voltage output by the charging device during the charging phase;

When it is determined that the maximum output voltage is less than or equal to the second voltage threshold, the battery of the power-consuming device is charged after the voltage output by the charging device is boosted during the charging phase.

Through the technical solution of this implementation method, when the maximum output voltage of the charging device is greater than or equal to the third voltage threshold, the voltage output by the charging device is used to directly charge the battery of the electric device, that is, the voltage output by the charging device is directly injected into the battery of the electric device without the need for boosting. When charging in this way, there is no need to use a motor for voltage conversion, that is, there is no need to boost, thereby avoiding the power loss caused by voltage conversion, making the charging efficiency higher, and also saving the time required for voltage conversion, that is, improving the charging speed. When the maximum output voltage of the charging device is less than the second voltage threshold, the voltage output by the charging device is first boosted and then injected into the battery, that is, the battery is boosted and charged, thereby solving the problem of being unable to charge the battery and being unable to fully charge the battery.

As a possible implementation, directly charging and/or boosting charging the battery of the electric device according to the maximum output voltage also includes:

When it is determined that the maximum output voltage is greater than the second voltage threshold and less than the third voltage threshold, charging is performed in the following manner during the charging stage:

Using the voltage output by the charging device to directly charge the battery of the power-consuming device, and obtaining the voltage and charging current of the battery during the charging process;

Acquire a fourth voltage threshold and a current threshold, wherein the fourth voltage threshold is less than or equal to the maximum output voltage;

comparing the voltage of the battery with a fourth voltage threshold, and comparing the charging current with a current threshold;

When it is determined that the voltage of the battery is greater than the fourth voltage threshold and the charging current is greater than the current threshold, the voltage output by the charging device is boosted to charge the battery of the power-consuming device.

Through the technical solution of this implementation mode, when the maximum output voltage of the charging device is greater than the second voltage threshold and less than the third voltage threshold, the charging speed and efficiency are further improved by mixing direct charging and boost charging.

As a possible implementation, before directly charging the battery of the power-consuming device using the voltage output by the charging device during the charging phase, the method further includes:

In the charging parameter configuration stage, the current battery voltage of the power-consuming device is sent to the charging device to perform charging parameter configuration.

As a possible implementation, after boosting the voltage output by the charging device in the charging stage and before charging the battery of the power-consuming device, the method further includes:

In the charging parameter configuration stage, the preset pre-charging voltage is sent to the charging device to perform charging parameter configuration.

In a second aspect, a control device for DC charging of an electrical device is provided, comprising:

An acquisition unit, used to acquire the maximum output voltage of the charging device after the charging interface of the electric device is connected to the charging device;

The charging unit is used to directly charge and/or boost the battery of the electrical device according to the maximum output voltage.

In a third aspect, a control device for direct current charging of an electric device is provided, wherein the device comprises: a processor and a memory storing computer program instructions;

When the processor executes the computer program instructions, the charging control method of the first aspect is implemented.

In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the charging control method of the first aspect is implemented.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

FIG1 is a schematic diagram of a DC charging circuit provided by the prior art;

FIG2 is a schematic diagram of the structure of a DC charging circuit provided in an embodiment of the present application;

FIG3 is a flow chart of a charging control method provided in an embodiment of the present application;

FIG4 is a flow chart of directly charging and/or boosting a battery of an electrical device according to a maximum output voltage, provided by an embodiment of the present application;

FIG5 is a flow chart of directly charging and/or boosting charging a battery of an electrical device according to a maximum output voltage provided by another embodiment of the present application;

FIG6 is a flow chart of charging an electric device provided in an embodiment of the present application;

FIG7 is a schematic diagram of the structure of a charging control device provided in an embodiment of the present application;

FIG8 is a schematic diagram of the structure of a charging control device provided in an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment 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 that is mutually exclusive with other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.

The term "plurality" used in the present application refers to two or more (including two).

At present, in order to ensure that the battery in the electric device (such as electric vehicles, hybrid electric vehicles HEV, etc.) can be charged with DC, the electric device is usually provided with a DC charging device for DC charging the battery, and the DC charging device mainly includes a charging interface and a DC charging circuit. Among them, the charging interface is used to connect to an external charging device (such as a DC charging pile), and the DC charging circuit is mainly used to connect the charging interface to the battery, and charge the battery after the charging interface is connected to the external charging device.

Generally, when an electrical device is charged using a charging device (such as a DC charging pile), it mainly includes the following stages:

Charging handshake phase, charging parameter configuration phase and charging phase.

Among them, the charging handshake stage mainly includes detecting whether the charging interface of the power-consuming device is successfully connected to the charging device. After confirming that the connection is successful, insulation detection is performed. The work of insulation detection is to check the insulation performance of the charging line to ensure the safety of the subsequent charging process. After safety is determined through insulation detection, the charging parameter configuration stage is entered. In the charging configuration stage, the power-consuming device and the charging device configure each other, and the configuration is used to determine whether charging can be performed. After determining that charging can be performed, the charging stage is entered. In the charging stage, the power-consuming device starts the DC charging circuit, so that the charging device can charge the battery of the power-consuming device through the DC charging circuit.

Referring to FIG1 , which is a schematic diagram of a DC charging circuit provided in the prior art, as shown in FIG1 , the DC charging circuit mainly includes: a motor M, a first switch device K1 , interface capacitors C1 and C2 and an inverter. The motor M can drive the motor.

The motor M includes a first winding U, a second winding V and a third winding W forming a three-phase winding.

The inverter includes a first phase branch, a second phase branch and a third phase branch connected in parallel, wherein the first phase branch includes a switch tube S1 and a switch tube S2 connected in series, the second phase branch includes a switch tube S3 and a switch tube S4 connected in series, and the third phase branch includes a switch tube S5 and a switch tube S6 connected in series. An end of the switch tube S1 not connected to the switch tube S2, an end of the switch tube S3 not connected to the switch tube S4, and an end of the switch tube S5 not connected to the switch tube S6 are all connected to the positive input end of the inverter, and an end of the switch tube S2 not connected to the switch tube S1, an end of the switch tube S4 not connected to the switch tube S3, and an end of the switch tube S6 not connected to the switch tube S5 are all connected to the negative input end of the inverter.

The positive input terminal of the inverter is connected to the positive electrode of the battery, and the negative input terminal of the inverter is connected to the negative electrode of the battery.

The first winding U is connected to the midpoint of the first phase branch, the second winding V is connected to the midpoint of the second phase branch, and the third winding W is connected to the midpoint of the third phase branch.

The interface capacitor C1 is connected in parallel with the inverter.

A first end of the first switch device K1 is connected to a connection line between the first winding U and the midpoint of the first phase branch, and a second end of the first switch device K1 is externally connected to the positive electrode of the charging interface.

Connect the negative pole of the charging port to the negative pole of the battery.

A first end of the interface capacitor C2 is connected to the second end of the first switch device K1 , and a second end of the interface capacitor C2 is connected to the negative electrode of the battery.

When the DC charging circuit is connected to the charging device through the charging interface, when charging the battery, the switch tube S1 and the switch tube S2 are turned off, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are turned on, and the first switch device K1 is closed, so that the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 form a boost circuit, thereby realizing boost charging of the battery.

Through the DC charging circuit, when charging the battery, the motor can be used to boost the voltage output by the charging device, thereby solving the problem that the output voltage of the charging device is too low to charge the battery.

However, when the above-mentioned DC charging circuit is used to charge the battery, only boost charging can be performed, that is, the voltage output by the charging device needs to be boosted before it can be charged into the battery. However, boost charging requires voltage conversion by the motor, which may cause two kinds of "waste". One is the waste of energy, because the motor has conversion efficiency. Therefore, when boost charging is performed, the conversion efficiency of the motor will cause power loss. For example, if the conversion efficiency of the motor is 95%, it will cause 5% power loss. The other is the waste of time, because the motor boost is limited by power. If the maximum power of the motor boost is 80kW, then if the charging device is 120kW, the charging time will increase by 50%.

It can be seen that when the electrical equipment uses the above DC charging circuit to charge the battery, there are problems of slow charging speed and low charging efficiency.

In view of this, an embodiment of the present application provides a DC charging circuit, which, based on the DC charging circuit shown in FIG1 , adds a charging branch that can directly charge the battery without boosting.

See FIG. 2 , which is a schematic diagram of the structure of a DC charging circuit provided in an embodiment of the present application. As shown in FIG. 2 , the DC charging circuit includes a first charging branch 210 and a second charging branch 220 .

Among them, the structure of the second charging branch 220 is basically the same as the structure of the DC charging circuit shown in Figure 1, the only difference is that a third switch device K3 is additionally provided in the second charging branch 220 provided in this embodiment, and the third switch device K3 is arranged on the connection line between the second end of the first switch device K1 and the positive electrode of the charging interface.

The first charging branch 210 includes a second switch device K2 , one end of the second switch device K2 is connected to the positive electrode of the charging interface, and the other end of the second switch device K2 is connected to the positive electrode of the battery.

Based on the DC charging circuit shown in FIG2 , after the DC charging circuit is connected to the charging device through the charging interface, when charging the battery, K2 can be disconnected, the switch tubes S1 and S2 can be turned off, the switch tubes S3, S4, S5 and S6 can be turned on, and the first switch device K1 and the third switch device K3 can be closed, so that the switch tubes S3, S4, S5 and S6 in the second charging branch form a boost circuit, thereby realizing boost charging of the battery.

Alternatively, the battery may be directly charged by the charging device through the first charging branch by closing K2 and opening K3, thereby achieving direct charging of the battery.

It can be seen that the above DC charging branch can realize both boost charging of the battery and direct charging of the battery.

Based on this, in order to improve the charging speed and charging efficiency of electrical equipment, the embodiment of the present application provides a charging control method for controlling the charging process when the electrical equipment is charged by a charging device. The charging control method provided in the embodiment of the present application can be used to realize DC charging of electrical equipment, which can be executed by the battery management system (BATTERY MANAGEMENT SYSTEM, referred to as BMS) of the electrical equipment, the vehicle controller or other on-board controller. Those skilled in the art will understand that in the embodiments of the present disclosure, the concepts of direct charging and boost charging should be understood according to the conventional meanings in the art. For example, direct charging can refer to charging according to the output voltage of charging equipment such as charging piles. During the direct charging process, the voltage output by the charging equipment is not boosted.

Referring to FIG. 3 , which is a flow chart of a charging control method provided in an embodiment of the present application, as shown in FIG. 3 , the charging control method provided in this embodiment may include the following steps:

S31. After the charging interface of the electric device is connected to the charging device, the maximum output voltage of the charging device is obtained.

S32. Directly charge and/or boost charge the battery of the electrical device according to the maximum output voltage.

Through the charging control method provided in this embodiment, after the electric device is connected to the charging device, before the charging parameter configuration stage, the maximum output voltage of the charging device is first obtained, and then it is determined according to the maximum output voltage whether to use the voltage output by the electric device to charge the battery directly, or to charge the battery after boosting the voltage output by the electric device, thereby realizing a charging device that automatically adapts to all output voltage ranges, avoiding the additional operation of manually identifying the charging device and selecting the charging method in advance, thereby improving the charging speed and efficiency.

Moreover, the charging control method provided in this embodiment can adaptively select between direct charging and boost charging. Compared with the boost charging method adopted in all circumstances, the charging speed and charging efficiency are improved. Compared with the direct charging method adopted in all circumstances, the problem of being unable to charge or fully charged due to insufficient output voltage of the charging device is solved.

The implementation method of the above steps is described below.

In some embodiments, the charging device is generally provided with a charging gun for charging the electric device, and the electric device is charged by inserting the charging gun into the charging interface of the electric device. Based on this, in S13, when it is determined that the charging gun of the charging device is inserted into the charging interface, it is determined that the charging interface of the electric device is connected to the charging device.

In S31, before the charging parameter configuration phase of the electric device, the maximum output voltage of the charging device is obtained. The maximum output voltage of the charging device can be obtained in the charging handshake phase, because in the charging handshake phase, the charging device uses the maximum output voltage for insulation detection, so the maximum output voltage of the charging device can be obtained in the charging handshake phase.

In some embodiments, a voltage acquisition device for collecting the voltage value output by the charging device may be pre-set in the charging interface of the electrical device. For example, a first voltage sampling point and a second voltage sampling point may be set at the high-voltage output end of the charging interface, wherein the first voltage sampling point is used to collect the positive voltage Uc output by the charging device after the charging interface is connected to the charging device, and the second voltage sampling point is used to collect the negative voltage U0 output by the charging device after the charging interface is connected to the charging device. In this way, when obtaining the maximum output voltage of the charging device, the positive voltage Uc and the negative voltage U0 output by the charging device can be respectively collected through the voltage sampling points set in the charging interface, and the difference between the positive voltage Uc and the negative voltage U0 is used as the maximum output voltage of the charging device.

The above is the implementation method of S31, and the implementation method of S32 is introduced below.

In some embodiments, when S32 directly charges and/or boosts the battery of the power-consuming device according to the maximum output voltage of the charging device, it may include the following steps:

S41. Obtain a first voltage threshold of the electric device, wherein the first voltage threshold is greater than or equal to a maximum battery voltage of the electric device.

The maximum battery voltage of the electrical device is the maximum voltage value of a battery that currently needs to be charged in the electrical device, and the maximum voltage value of the battery is usually a fixed value.

In one example, the first voltage threshold may be pre-set according to the maximum voltage of the power-consuming device and stored in a local file of the power-consuming device or an accessible server. Thus, when obtaining the first voltage threshold, it may be directly obtained from the storage location.

In another example, when obtaining the first voltage threshold, the maximum battery voltage of the electric device may be obtained, and then the obtained maximum battery voltage is used as the first voltage threshold, or the obtained maximum battery voltage is added to a preset first voltage value, and then the sum is used as the first voltage threshold, wherein the first voltage value may be set according to actual conditions, for example, may be 10 V. In one example, if the maximum battery voltage of the electric device is 750 V, the first voltage threshold may be 750 V or 760 V.

S42. Compare the maximum output voltage with the first voltage threshold to determine whether the maximum output voltage is less than the first voltage threshold. If it is determined that the maximum output voltage is greater than or equal to the first voltage threshold, execute S43; if it is determined that the maximum output voltage is less than the first voltage threshold, execute S44.

S43. During the charging phase, the voltage output by the charging device is used to directly charge the battery of the electrical device.

When the maximum output voltage of the charging device is greater than or equal to the first voltage threshold, it can be determined that the maximum output voltage of the charging device is greater than the maximum voltage value of the battery to be charged. At this time, the charging device can directly charge the battery of the power-consuming device and can ensure that the battery can be fully charged. Therefore, in this case, the voltage output by the charging device can be used to directly charge the battery of the power-consuming device, that is, the voltage output by the charging device is directly injected into the battery of the power-consuming device without the need for boosting. When charging in this way, there is no need to use a motor for voltage conversion, that is, there is no need for boosting, thereby avoiding the power loss caused by voltage conversion, making the charging efficiency higher, and also saving the time required for voltage conversion, that is, improving the charging speed.

Taking the case where the electrical device is provided with a DC charging circuit as shown in FIG2 as an example, the first charging branch can be used to directly charge the battery of the electrical device using the voltage output by the charging device. In the charging stage, by closing K2 and opening K3, the first charging branch is turned on and the second charging branch is disconnected, so that the voltage output by the charging device is directly injected into the battery through the first charging branch.

Before the charging stage, it is also necessary to configure the charging parameters. Based on this, before using the voltage output by the charging device to directly charge the battery of the power-consuming device during the charging stage, the current battery voltage of the power-consuming device can be sent to the charging device as a charging parameter during the charging parameter configuration stage to configure the charging parameters. When sending the current battery voltage to the charging device, the current battery voltage can be added to the BCP (Battery Charging Parameters) message, and then the BCP message is sent to the charging device, so that the charging device determines whether the battery of the power-consuming device can be charged according to the current battery voltage. Usually, when the charging device determines that the voltage value carried in the BCP message is less than the maximum output voltage value of the charging device, it determines that the battery can be charged. Based on the previous judgment, it has been determined that the current battery voltage is less than the maximum output voltage of the charging device, so the charging device can determine that the battery can be charged through judgment after receiving the BCP message, thereby entering the charging stage.

S44. During the charging phase, the voltage output by the charging device is boosted and then used to charge the battery of the power-consuming device.

When the maximum output voltage of the charging device is less than the first voltage threshold, it can be determined that the maximum output voltage of the charging device is less than or close to the maximum voltage value of the battery to be charged. At this time, if DC charging is used, the battery may not be charged or fully charged due to the voltage of the charging device being not large enough. Therefore, in this case, the voltage output by the charging device is first boosted and then injected into the battery, that is, the battery is boosted and charged, thereby solving the problem of being unable to charge the battery or being unable to fully charge the battery.

Taking the DC charging circuit shown in FIG2 as an example, the second charging branch can be used to boost the voltage output by the charging device and then charge the battery of the electric device. In the charging stage, K2 is controlled to be disconnected, the switch tubes S1 and S2 are controlled to be turned off, the switch tubes S3, S4, S5, and S6 are controlled to be turned on, and K1 and K3 are controlled to be closed. In this way, the switch tubes S3, S4, S5, and S6 in the second charging branch form a boost loop, thereby realizing boost charging of the battery.

Charging parameters need to be configured before the charging stage. Based on this, after the voltage output by the charging device is boosted during the charging stage and before charging the battery of the electrical device, during the charging parameter configuration stage, the preset pre-charge voltage is sent to the charging device for charging parameter configuration.

The pre-charge voltage is set in advance according to the actual situation and stored in a local file of the power-consuming device or an accessible server node. When setting the pre-charge voltage, it can be set according to the boost circuit in the second charging branch. Usually, the pre-charge voltage is less than the maximum voltage value of the battery and less than the maximum output voltage of the charging device.

When the pre-charge voltage is sent to the charging device, the pre-charge voltage can be added to the BCP message, and then the BCP message is sent to the charging device, so that the charging device can determine whether the battery of the power device can be charged according to the pre-charge voltage. Usually, when the charging device determines that the voltage value carried in the BCP message is less than the maximum output voltage value of the charging device, it determines that the battery can be charged. According to the setting of the pre-charge voltage, it can be determined that the pre-charge voltage is less than the maximum output voltage of the charging device, so the charging device can determine that the battery can be charged by judgment after receiving the BCP message, thereby entering the charging stage.

In some embodiments, in S32, when directly charging and/or boosting charging the battery of the power-consuming device according to the maximum output voltage of the charging device, as shown in FIG5 , the following steps may be included:

S51. Obtain a second voltage threshold and a third voltage threshold of the electric device, wherein the second voltage threshold is greater than or equal to a current battery voltage of the electric device, and the third voltage threshold is greater than or equal to a maximum battery voltage of the electric device.

In one example, when obtaining the second voltage threshold, the current battery voltage of the electric device can be obtained, and then the obtained current battery voltage is used as the second battery voltage, or the obtained current battery voltage is added to a preset second voltage value, and the sum obtained is used as the second voltage threshold. The second voltage value can be preset according to actual conditions, for example, it can be 30V.

In one example, the third voltage threshold may be pre-set according to the maximum voltage of the power-consuming device and stored in a local file of the power-consuming device or an accessible server. Thus, when obtaining the third voltage threshold, it may be directly obtained from the storage location.

In another example, when obtaining the third voltage threshold, the maximum battery voltage of the electric device may be obtained, and then the obtained maximum battery voltage is used as the third voltage threshold, or the obtained maximum battery voltage is added to a preset third voltage value, and then the sum is used as the third voltage threshold, wherein the third voltage value may be set according to actual conditions, for example, may be 10 V. In one example, if the maximum battery voltage of the electric device is 750 V, the first voltage threshold may be 750 V or 760 V.

Because the third voltage threshold is greater than or equal to the maximum battery voltage, the second voltage threshold is greater than or equal to the current battery voltage, and when the battery is charging, its current battery voltage is usually less than the maximum battery voltage, the third voltage threshold is usually greater than the second voltage threshold.

S52. Compare the maximum output voltage with the second voltage threshold and the third voltage threshold respectively. When it is determined through comparison that the maximum output voltage is greater than or equal to the third voltage threshold, execute S53. When it is determined through comparison that the maximum output voltage is less than or equal to the second voltage threshold, execute S54. When it is determined through comparison that the maximum output voltage is greater than the second voltage threshold and less than the third voltage threshold, execute S55.

S53. During the charging phase, the voltage output by the charging device is used to directly charge the battery of the electrical device.

When the maximum output voltage of the charging device is greater than or equal to the third voltage threshold, it can be determined that the maximum output voltage of the charging device is greater than the maximum voltage value of the battery to be charged. At this time, the charging device can directly charge the battery of the power-consuming device and can ensure that the battery can be fully charged. Therefore, in this case, the voltage output by the charging device can be used to directly charge the battery of the power-consuming device, that is, the voltage output by the charging device is directly injected into the battery of the power-consuming device without the need for boosting. When charging in this way, there is no need to use a motor for voltage conversion, that is, there is no need for boosting, thereby avoiding the power loss caused by voltage conversion, making the charging efficiency higher, and also saving the time required for voltage conversion, that is, increasing the charging speed.

The specific implementation method of directly charging the battery of the power-consuming device using the voltage output by the charging device is the same as S43, and will not be described again here to avoid repetition.

Before the charging stage, the charging parameters need to be configured. Based on this, before the voltage output by the charging device is used to directly charge the battery of the power-consuming device during the charging stage, the current battery voltage of the power-consuming device can be sent to the charging device as a charging parameter during the charging parameter configuration stage to configure the charging parameters. For the specific sending method, see the relevant description in the implementation method corresponding to S43, which will not be repeated here.

S54. During the charging phase, the voltage output by the charging device is boosted and then used to charge the battery of the electrical device.

When the maximum output voltage of the charging device is less than the second voltage threshold, it can be determined that the maximum output voltage of the charging device is less than or close to the current battery voltage. At this time, if DC charging is used, the battery may not be charged because the voltage of the charging device is not large enough. Therefore, in this case, the voltage output by the charging device is first boosted and then injected into the battery, that is, the battery is boosted and charged, thereby solving the problem of being unable to charge the battery and being unable to fully charge the battery.

The specific implementation method of charging the battery of the power-consuming device after boosting the voltage output by the charging device is the same as S44, and will not be repeated here to avoid repetition.

Before the charging stage, the charging parameters need to be configured. Based on this, after the voltage output by the charging device is boosted during the charging stage and before the battery of the power-consuming device is charged, in the charging parameter configuration stage, the preset pre-charge voltage is sent to the charging device to configure the charging parameters. For the specific sending method, see the relevant description in the implementation method corresponding to S44, which will not be repeated here.

S55. In the charging stage, the battery of the electrical device is first directly charged using the voltage output by the charging device, and then the voltage output by the charging device is boosted to charge the battery of the electrical device.

When the maximum output voltage of the charging device is between the second voltage threshold and the third voltage threshold, it means that the maximum output voltage of the charging device is greater than the current battery voltage. Therefore, the battery can be charged with direct current at this time. However, since the maximum output voltage is less than or close to the maximum voltage value of the battery, the battery may not be fully charged if direct charging is used all the time. If the boost charging method is used consistently, there will be problems such as large power loss and slow charging speed. Therefore, in order to ensure that the battery can be fully charged, reduce power loss and increase charging speed, in this case, the battery of the electrical device is first charged directly using the voltage output by the charging device, and then the voltage output by the charging device is boosted to charge the battery of the electrical device. In this way, the advantages of direct charging and boost charging are combined, and power loss is further reduced and charging speed is increased while ensuring that the battery can be fully charged.

In one example, in S55, charging may be performed in the following manner during the charging stage:

The battery of the electrical device is directly charged using the voltage output by the charging device, and during the charging process, the battery voltage (referring to the real-time voltage of the battery) and the charging current are obtained, and a fourth voltage threshold and a current threshold are obtained, wherein the fourth voltage threshold is less than or equal to the maximum output voltage, the battery voltage is compared with the fourth voltage threshold, and the charging current is compared with the current threshold, and when it is determined that the battery voltage is greater than the fourth voltage threshold, and the charging current is greater than the current threshold, the voltage output by the charging device is boosted to charge the battery of the electrical device.

Among them, the implementation method of directly charging the battery of the power-consuming device using the voltage output by the charging device is the same as S43, and will not be repeated here to avoid repetition.

When obtaining the fourth voltage threshold, the maximum output voltage of the charging device can be obtained, and then the maximum output voltage is used as the fourth voltage threshold, or the difference between the maximum output voltage and the preset fourth voltage value is used as the fourth voltage threshold. The fourth voltage value can be set according to actual conditions, for example, it can be 10V.

The current threshold is a minimum operating voltage of a boost device used to boost the voltage output by the charging device.

The reason why direct charging is switched to boost charging when it is determined that the battery voltage is greater than the fourth voltage threshold and the charging current is greater than the current threshold is that when the battery voltage is greater than the fourth voltage threshold, it means that the maximum output voltage of the charging device is less than or close to the current voltage of the battery. At this time, the battery can no longer be directly charged, and when the charging current is less than or equal to the current threshold, the boost device cannot boost the voltage. Therefore, only when the above two conditions are met, the direct charging is switched to the boost charging.

Taking the case where the electrical equipment is provided with a DC charging circuit as shown in FIG2 as an example, the current threshold may be the minimum operating voltage of the motor, which may be calculated according to the maximum boost power of the motor and the maximum output voltage of the charging equipment as follows:

I＝P _m /U _cm1

Among them, I represents the current threshold, that is, the minimum operating current of the motor, _Pm represents the maximum boost power of the motor, and _Ucm1 represents the maximum output voltage of the charging device.

When switching from direct charging to boost charging, based on the DC charging circuit shown in FIG2 , K2 can be controlled to be disconnected, the switch tubes S1 and S2 can be controlled to be turned off, the switch tubes S3, S4, S5, and S6 can be controlled to be turned on, and K1 and K3 can be controlled to be closed. In this way, a boost loop is formed by the switch tubes S3, S4, S5, and S6 in the second charging branch, thereby realizing boost charging of the battery.

Furthermore, before directly charging the battery of the power-consuming device using the voltage output by the charging device in S55, the charging parameters may be configured first. In the charging parameter configuration stage, the current battery voltage of the power-consuming device may be sent to the charging device to configure the charging parameters. For the specific sending method, see the relevant description in the implementation method corresponding to S43, which will not be repeated here.

Referring to FIG. 6 , it is a flow chart of charging of an electrical device provided with the DC charging circuit shown in FIG. 2 .

As shown in FIG6 , when the electric device is DC charged, in the charging handshake stage, the maximum output voltage U _cm1 of the charging device, the maximum battery voltage of the electric device and the current battery voltage are collected, the third voltage threshold U _{threshold 3} is determined according to the maximum battery voltage, the second voltage threshold U _{threshold 2} is determined according to the current battery voltage, U _cm1 is compared with U _{threshold 3} and U _{threshold 2} respectively, if U _cm1 is greater than or equal to U _{threshold 3} , then in the charging parameter configuration stage, the BCP message sends the current battery voltage, and in the charging stage, the first charging branch is controlled to perform direct charging; if U _cm1 is between U _{threshold 3} and U _{threshold 2} , then in the charging parameter configuration stage, the BCP message sends the current battery voltage, and in the charging stage, the first charging branch is first controlled to perform direct charging, and in the charging process, it is determined whether the current battery temperature U ₁ is greater than the fourth voltage threshold U _{threshold 4} and the charging current is greater than the current threshold I. When it is determined that the above conditions are met, charging is suspended, the first charging branch is switched to the second charging branch, and then the second charging branch is controlled to perform boost charging. When it is determined that the above conditions are not met, the first charging branch continues to be controlled to perform direct charging; if U If _cm1 is less than or equal to U _{threshold 2} , then in the charging parameter configuration stage, the BCP message sends the pre-charging voltage, and in the charging stage, the second charging branch is controlled to perform boost charging.

Assuming that the maximum battery voltage of the electrical equipment is 810V, the initial battery voltage U1 when the battery is charged is 600V, the maximum motor boost power Pm in the second charging branch is 80kW, and the electrical equipment is connected to a 120kW charging device with an output voltage range of 300-750V.

In an example, it is assumed that the maximum battery voltage of the electrical equipment is 810V, the initial battery voltage U1=600V, the initial battery voltage refers to the current battery voltage obtained when charging starts, the maximum boost power Pm of the motor in the second charging branch is 80kW, the charging equipment is a 120kW charging pile with an output voltage range of 300-750V, U _{threshold 2} is the sum of U1 and 30V, that is, 630V, U _{threshold 4} is the difference between U _cm1 and 10V, that is, 740V, I=P _m /U _cm1 =80kw/750V=106.7A.

Based on the process shown in FIG6 , it can be determined that U _cm1 is greater than U _{threshold 2} . In the charging stage, K2 is closed first, and DC charging is performed using the first charging branch. During the charging process, the current battery voltage obtained is greater than U _{threshold 4} , and when the charging current is greater than 106.7 A, charging is suspended, K2 is disconnected, K3 is closed, and the second charging branch is switched to continue boost charging.

Based on the above assumptions, the hybrid charging mode of Figure 6 is used for charging, and the boost charging mode is used for charging directly, and the following table is obtained:

It can be seen from the above table that compared with charging in boost charging mode only, the charging power is greater when hybrid charging mode is used, thereby improving charging efficiency and saving electric energy.

Based on the control method for DC charging of an electrical device provided in the above-mentioned embodiment, the embodiment of the present application also provides a specific implementation of a control device for DC charging of an electrical device.

Referring to FIG. 7 , which is a schematic diagram of the structure of a charging control device provided by an exemplary embodiment of the present application, as shown in FIG. 7 , a charging control device provided by this embodiment may include:

The acquisition unit 701 is used to acquire the maximum output voltage of the charging device after the charging interface of the electric device is connected to the charging device.

The charging unit 702 is used to directly charge and/or boost charge the battery of the electrical device according to the maximum output voltage.

Through the charging control device provided in this embodiment, after the electric device is connected to the charging device, the maximum output voltage of the charging device is obtained, and then the battery of the electric device is charged according to the maximum output voltage. According to this embodiment, it is possible to determine how to charge and execute charging according to the maximum output voltage of the charging device, avoiding the additional operation of manually identifying the charging device and selecting the charging method in advance, thereby improving the charging speed and efficiency.

In some embodiments, the acquisition unit 701 may acquire the maximum output voltage of the charging device through a voltage acquisition device provided in the charging pile interface before the charging parameter configuration stage of the electric device.

In some embodiments, the charging unit 702 can be used to:

comparing the maximum output voltage to a first voltage threshold;

In some embodiments, the charging unit 702 can be used to:

In some embodiments, the charging unit 702 may also be used to:

In some embodiments, the apparatus may further include: a parameter configuration unit;

The parameter configuration unit is used to send the current battery voltage of the power-consuming device to the charging device in the charging parameter configuration stage before directly charging the battery of the power-consuming device using the voltage output by the charging device in the charging stage to configure the charging parameters.

In some embodiments, the parameter configuration unit may also be used to send a preset pre-charge voltage to the charging device during the charging parameter configuration phase after boosting the voltage output by the charging device and before charging the battery of the power-consuming device for charging parameter configuration.

FIG8 shows a schematic diagram of the hardware structure of a charging control device provided in an embodiment of the present application.

The charging control device may include a processor 801 and a memory 802 storing computer program instructions.

Specifically, the above-mentioned processor 801 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

The memory 802 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 802 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 802 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 802 may be inside or outside the integrated gateway disaster recovery device. In a particular embodiment, the memory 802 is a non-volatile solid-state memory.

The memory 802 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical/tangible memory storage device. Therefore, generally, the memory 802 includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described in the method according to the first aspect of the present disclosure.

The processor 801 implements any one of the charging control methods in the above embodiments by reading and executing computer program instructions stored in the memory 802 .

In one example, the battery status detection device may further include a communication interface 803 and a bus 180. As shown in Fig. 8, the processor 801, the memory 802, and the communication interface 803 are connected via a bus 810 and communicate with each other.

The communication interface 803 is mainly used to implement communication between various modules, devices, units and/or equipment in the embodiments of the present application.

Bus 810 includes hardware, software or both, and the parts of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 810 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the application considers any suitable bus or interconnection.

In addition, in combination with the battery status detection method in the above embodiment, the embodiment of the present application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the charging control methods in the above embodiment is implemented.

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A charging control method, comprising:

After the charging interface of the electric device is connected to the charging device, obtaining the maximum output voltage of the charging device;

The battery of the electric device is directly charged and/or boosted according to the maximum output voltage.
The method according to claim 1, wherein obtaining the maximum output voltage of the charging device comprises:

Before the charging parameter configuration stage of the electric device, the maximum output voltage of the charging device is obtained through the voltage acquisition device provided in the charging pile interface.
The method according to claim 1, wherein directly charging and/or boosting charging the battery of the electric device according to the maximum output voltage comprises:

Acquire a first voltage threshold of the electric device, wherein the first voltage threshold is greater than or equal to a maximum battery voltage of the electric device;

comparing the maximum output voltage with the first voltage threshold;

When it is determined that the maximum output voltage is greater than or equal to the first voltage threshold, directly charging the battery of the power-consuming device using the voltage output by the charging device during the charging stage;

When it is determined that the maximum output voltage is less than the first voltage threshold, the battery of the power-consuming device is charged after the voltage output by the charging device is boosted during the charging phase.
The method according to claim 1, wherein directly charging and/or boosting charging the battery of the electric device according to the maximum output voltage comprises:

Acquire a second voltage threshold and a third voltage threshold of the electric device, wherein the second voltage threshold is greater than or equal to a current battery voltage of the electric device, and the third voltage threshold is greater than or equal to a maximum battery voltage of the electric device;

comparing the maximum output voltage with the second voltage threshold and the third voltage threshold respectively;

When it is determined that the maximum output voltage is greater than or equal to the third voltage threshold, directly charging the battery of the power-consuming device using the voltage output by the charging device during the charging phase;

When it is determined that the maximum output voltage is less than or equal to the second voltage threshold, the battery of the power-consuming device is charged after the voltage output by the charging device is boosted during the charging phase.
The method according to claim 4, wherein the directly charging and/or boost charging of the battery of the electric device according to the maximum output voltage further comprises:

When it is determined that the maximum output voltage is greater than the second voltage threshold and less than the third voltage threshold, charging is performed in the following manner during the charging stage:

Using the voltage output by the charging device to directly charge the battery of the power-consuming device, and obtaining the voltage and charging current of the battery during the charging process;

Acquire a fourth voltage threshold and a current threshold, wherein the fourth voltage threshold is less than or equal to the maximum output voltage;

comparing the voltage of the battery with the fourth voltage threshold, and comparing the charging current with the current threshold;

When it is determined that the voltage of the battery is greater than the fourth voltage threshold and the charging current is greater than the current threshold, the voltage output by the charging device is boosted to charge the battery of the electrical device.
The method according to any one of claims 3 to 5, wherein before directly charging the battery of the power-consuming device using the voltage output by the charging device during the charging stage, the method further comprises:

In the charging parameter configuration stage, the current battery voltage of the power-consuming device is sent to the charging device to perform charging parameter configuration.
The method according to claim 3 or 4, wherein, before charging the battery of the power-consuming device after boosting the voltage output by the charging device in the charging stage, the method further comprises:

In the charging parameter configuration stage, the preset pre-charging voltage is sent to the charging device to perform charging parameter configuration.
A charging control device, comprising:

An acquisition unit, configured to acquire a maximum output voltage of the charging device after the charging interface of the electric device is connected to the charging device;

A charging unit is used to directly charge and/or boost charge the battery of the electrical device according to the maximum output voltage.
A charging control device, wherein the device comprises: a processor and a memory storing computer program instructions;

When the processor executes the computer program instructions, the charging control method according to any one of claims 1 to 7 is implemented.
A computer-readable storage medium, wherein computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, the charging control method according to any one of claims 1 to 7 is implemented.