阅读说明：本技术 能切换多电压等级输出的电池箱系统及输出电压切换方法 (Battery box system capable of switching multi-voltage grade output and output voltage switching method ) 是由 杨昌富 刘鹏飞 李许鹏 柳建学 于 2021-07-28 设计创作，主要内容包括：本发明提供一种能切换多电压等级输出的电池箱系统及输出电压切换方法,其包括多个电池模组、电池模组切换单元、电池管理单元、高压控制单元及电池箱连接器,电池模组、电池模组切换单元、高压控制单元和电池箱连接器依次电连接；电池管理单元与电池模组、电池模组切换单元、高压控制单元和电池箱连接器分别通信连接,电池管理单元用于对整个电池系统进行信息监测及故障处理并识别不同车型的电压等级控制切换单元的开合状态。其通过电池管理系统与车辆信息交互,识别车型及需求电压,控制电池模组切换单元的切换状态,完成电池模组串并联状态转换,高压控制单元控制输出实现电池箱电压等级变换,提升电池箱系统的兼容性,降低整站运行成本。(The invention provides a battery box system capable of switching multi-voltage grade output and an output voltage switching method, wherein the battery box system comprises a plurality of battery modules, a battery module switching unit, a battery management unit, a high-voltage control unit and a battery box connector, wherein the battery modules, the battery module switching unit, the high-voltage control unit and the battery box connector are electrically connected in sequence; the battery management unit is in communication connection with the battery module, the battery module switching unit, the high-voltage control unit and the battery box connector respectively, and the battery management unit is used for carrying out information monitoring and fault processing on the whole battery system and identifying the opening and closing states of the voltage grade control switching unit of different vehicle types. The battery management system is in information interaction with a vehicle, the vehicle type and the required voltage are identified, the switching state of the battery module switching unit is controlled, the series-parallel state conversion of the battery modules is completed, the output is controlled by the high-voltage control unit to realize the voltage grade conversion of the battery box, the compatibility of the battery box system is improved, and the running cost of the whole station is reduced.)

1. The utility model provides a can switch battery box system of output of multivoltage level which characterized in that: the battery module, the battery module switching unit, the high-voltage control unit and the battery box connector are electrically connected in sequence; the battery management unit is in communication connection with the battery module, the battery module switching unit, the high-voltage control unit and the battery box connector respectively, and is used for carrying out information monitoring and fault processing on the whole battery system and identifying the opening and closing states of the voltage grade control switching unit of different vehicle types;

the battery module switching unit is arranged among the plurality of battery modules, the battery module switching unit switches the matched battery modules to output voltage according to required voltage or current, and the number of the battery module switching units is reduced by 1 from the number of the battery modules;

assuming that a certain electric vehicle has M battery boxes, each battery box has N battery modules and N-1 battery module switching units, the electric vehicle has M (N-1) battery module switching units in total, and the switching times X are calculated according to the need₁The calculation formula is as follows:

wherein, V₁Voltage of each battery module, V₂For the required voltage of the battery box, the switching frequency of each battery box is X₁，X₁Taking an integer, wherein X is the maximum switching frequency of each battery box; after the battery management unit calculates the switching times according to the required voltage, a switching command is issued to the battery module switching unit through CAN communication, and after the battery switching unit acts, the output voltage of the battery box meets the required voltage of the electric vehicle;

after each switching is completed, the storage unit stores the parameters of each switching operation in a matrix mode, the storage matrix is P, the parameters of each switching operation are a, and the expression of the storage matrix P is as follows:

P＝{A₁,A₂,A₃.....A_i}

wherein, P is a memory matrix, A is a parameter of each switching work, and the expression of A is as follows:

A＝{V₁∩V₂∩X₁}；

when switching is needed, the battery management unit communicates with the storage unit, the parameter A of each switching operation which is the same as the required voltage of the battery box is called in the storage matrix, and the switching times X of the battery box are obtained from the parameter A of the switching operation₁。

2. The battery box system capable of switching a multi-voltage level output according to claim 1, characterized in that: the battery box connector is provided with a power output interface DC +, a power output interface DC-, a grounding interface PE, a plurality of groups of communication interfaces and a plurality of groups of auxiliary power interfaces, so that a high-voltage power supply, communication information interaction and a low-voltage auxiliary power supply channel can be provided between the battery box and the electric vehicle.

3. The battery box system capable of switching a multi-voltage level output according to claim 1, characterized in that: the high-voltage control unit has a pre-charging function and can be communicated with the battery management unit to control the high-voltage output on-off state, so that the charging and discharging requirements of the battery are met.

4. The battery box system capable of switching a multi-voltage level output according to claim 1, characterized in that: a voltage sensor and a current sensor are arranged on the voltage output bus, the voltage sensor can measure output voltage, and an alarm is given when the voltage exceeds a working range;

the current sensor can measure the current in a working state, alarm and interrupt or reduce the output power when the current exceeds the range, and prevent short circuit or overload.

5. An output voltage switching method of a battery box system capable of switching a multi-voltage level output according to claim 1, characterized in that: which comprises the following steps:

s1, when the vehicle is powered on, the vehicle management system generates required voltage to the battery management unit;

s2, after the battery management unit receives the required voltage of the vehicle, judging whether the existing battery box meets the required voltage, when the existing battery box can not meet the required voltage, the battery management unit calculates the switching times according to the required voltage, and the switching times are calculated through the following formula:

wherein, V₁Voltage of each battery module, V₂For the required voltage of the battery box, the switching frequency of each battery box is X₁，X₁Taking an integer, wherein X is the maximum switching frequency of each battery box;

s2, the battery management unit calculates the switching times according to the required voltage, and then sends a switching command and a switching action to the battery module switching unit through CAN communication;

s3, after the battery module switching unit completes switching, if the battery box after switching meets the required voltage, ending the switching process, and starting the high-voltage control unit to perform charging protection; if the required voltage cannot be met, alarming and replacing the battery box with the rest battery modules, and then repeating the step S2;

s4, after each switching operation, the storage unit stores the parameter of each switching operation in a matrix manner, where the storage matrix is P, the parameter of each switching operation is a, and an expression of the storage matrix P is as follows:

P＝{A₁,A₂,A₃.....A_i}

wherein, P is a memory matrix, A is a parameter of each switching work, and the expression of A is as follows:

A＝{V₁∩V₂∩X₁}；

s5, when switching is needed, the battery management unit communicates with the storage unit, the parameter A of each switching operation which is the same as the required voltage of the battery box is called in the storage matrix, and the switching times X of the battery box are obtained from the parameter A of the switching operation₁And the switching times are sent to a battery module switching unit through CAN communication, if the battery box meets the required voltage after switching, the switching process is ended, and a high-voltage control unit is started for charging protection; if the required voltage cannot be satisfied, the alarm is given and the battery box having the remaining battery modules is replaced and then the step S2 is repeated.

Technical Field

The invention relates to the technical field of electric vehicle charging and battery replacement, in particular to a battery box system capable of switching multi-voltage grade output and an output voltage switching method.

Background

The electric vehicle (BEV) is a vehicle which takes a vehicle-mounted power supply as power and drives wheels by a motor, and meets various requirements of road traffic and safety regulations. Because the influence on the environment is smaller than that of the traditional automobile, the prospect is widely seen. The working principle is that power is supplied by a storage battery, so that the charging and discharging of the battery are very important.

Along with the continuous expansion of the application scale of electric automobiles and battery replacement in China, batteries of battery replacement boxes are not unified, and the matched battery replacement stations can only meet the same voltage level and the vehicle types of the battery replacement electric automobiles are similar. At present, the universality of the battery replacing box becomes a promotion for restricting the battery replacing.

According to the multi-voltage-level output battery box system, series-parallel connection switching among battery modules of the battery box is achieved through the battery module switching unit, the battery box system with different voltage levels output and changing the voltage of the battery modules as a unit is achieved, the requirements of electric vehicles with different voltage levels are met, and the universality of battery box replacement is improved.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a battery box system capable of switching multi-voltage grade output and an output voltage switching method aiming at the problem that battery boxes of battery-replaceable battery boxes can not be interchanged for different voltage grades and similar battery boxes of battery-replaceable electric vehicles, wherein different battery boxes can be replaced according to different voltage requirements, so that the charging problem of the electric vehicles with different voltages can be met.

The battery box system comprises a plurality of battery modules, a battery module switching unit, a battery management unit, a high-voltage control unit and a battery box connector, wherein the battery modules, the battery module switching unit, the high-voltage control unit and the battery box connector are electrically connected in sequence; the battery management unit is in communication connection with the battery module, the battery module switching unit, the high-voltage control unit and the battery box connector respectively, and is used for carrying out information monitoring and fault processing on the whole battery system and identifying the opening and closing states of the voltage grade control switching unit of different vehicle types;

the battery module switching unit is arranged among the plurality of battery modules, the battery module switching unit switches the matched battery modules to output voltage according to required voltage or current, and the number of the battery module switching units is reduced by 1 from the number of the battery modules;

assuming that a certain electric vehicle has M battery boxes, each battery box has N battery modules and N-1 battery module switching units, the electric vehicle has M (N-1) battery module switching units in total, and the switching times X are calculated according to the need₁The calculation formula is as follows:

wherein, V₁Voltage of each battery module, V₂For the required voltage of the battery box, the switching frequency of each battery box is X₁，X₁Taking an integer, wherein X is the maximum switching frequency of each battery box; after the battery management unit calculates the switching times according to the required voltage, a switching command is issued to the battery module switching unit through CAN communication, and after the battery switching unit acts, the output voltage of the battery box meets the required voltage of the electric vehicle;

after each switching is completed, the storage unit stores the parameters of each switching operation in a matrix mode, the storage matrix is P, the parameters of each switching operation are a, and the expression of the storage matrix P is as follows:

P＝{A₁,A₂,A₃.....A_i}

wherein, P is a memory matrix, A is a parameter of each switching work, and the expression of A is as follows:

A＝{V₁∩V₂∩X₁}；

when switching is needed, the battery management unit communicates with the storage unit, the parameter A of each switching operation which is the same as the required voltage of the battery box is called in the storage matrix, and the switching times X of the battery box are obtained from the parameter A of the switching operation₁。

Preferably, the battery box connector is provided with a power output interface DC +, a power output interface DC-, an output interface PE, a plurality of groups of communication interfaces and a plurality of groups of auxiliary power interfaces, so that a high-voltage power supply, communication information interaction and a low-voltage auxiliary power supply channel can be provided between the battery box and the electric vehicle.

Preferably, the high-voltage control unit has a pre-charging function, and the high-voltage control unit can communicate with the battery management unit to control the on-off state of the high-voltage output, so that the charging and discharging requirements of the battery are met.

Preferably, a voltage sensor and a current sensor are arranged on the voltage output bus, the voltage sensor can measure output voltage, and an alarm is given when the voltage exceeds a working range;

the current sensor can measure the current in a working state, alarm and interrupt or reduce the output power when the current exceeds the range, and prevent short circuit or overload.

Preferably, the present invention further provides an output voltage switching method, which includes the following steps:

s1, when the vehicle is powered on, the vehicle management system generates required voltage to the battery management unit;

s2, after the battery management unit receives the required voltage of the vehicle, judging whether the existing battery box meets the required voltage, when the existing battery box can not meet the required voltage, the battery management unit calculates the switching times according to the required voltage, and the switching times are calculated through the following formula:

wherein, V₁Voltage of each battery module, V₂For the required voltage of the battery box, the switching frequency of each battery box is X₁，X₁Taking an integer, wherein X is the maximum switching frequency of each battery box;

s2, the battery management unit calculates the switching times according to the required voltage, and then sends a switching command and a switching action to the battery module switching unit through CAN communication;

s3, after the battery module switching unit completes switching, if the battery box after switching meets the required voltage, ending the switching process, and starting the high-voltage control unit to perform charging protection; if the required voltage cannot be met, alarming and replacing the battery box with the rest battery modules, and then repeating the steps S1-S2;

s4, after each switching operation, the storage unit stores the parameter of each switching operation in a matrix manner, where the storage matrix is P, the parameter of each switching operation is a, and an expression of the storage matrix P is as follows:

P＝{A₁,A₂,A₃.....A_i}

wherein, P is a memory matrix, A is a parameter of each switching work, and the expression of A is as follows:

A＝{V₁∩V₂∩X₁}；

s5, when switching is needed, the battery management unit communicates with the storage unit, the parameter A of each switching operation which is the same as the required voltage of the battery box is called in the storage matrix, and the switching times X of the battery box are obtained from the parameter A of the switching operation₁And the switching times are sent to a battery module switching unit through CAN communication, if the battery box meets the required voltage after switching, the switching process is ended, and a high-voltage control unit is started for charging protection; if the required voltage cannot be satisfied, the alarm is given and the battery box having the remaining battery modules is replaced and then the step S2 is repeated.

Compared with the prior art, the invention has the following beneficial effects:

the battery box system disclosed by the invention is communicated with a vehicle to identify the required voltage grade, and is connected with the battery box for outputting a plurality of voltage grades through the battery module, the battery module switching unit and the high-voltage control unit. Through battery management system and vehicle information interaction, discernment motorcycle type and demand voltage control battery module switching unit's switching state, accomplish battery module series-parallel connection state, high-voltage control unit control output realizes battery box voltage grade transform, promotes battery box system's compatibility, reduces whole station running cost, reduces manpower and materials loss, improves work efficiency.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a block diagram of a multi-voltage class output battery box system of the present invention;

FIG. 3 is a schematic diagram of a battery module switching unit of the system of the present invention;

fig. 4 is a schematic diagram of a control flow of the battery module switching unit of the system of the present invention.

Detailed Description

Exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

Specifically, the present invention provides a battery box system capable of switching multi-voltage class output, as shown in fig. 1 to 3, which includes a plurality of battery modules 1, a battery module switching unit 2, a battery management unit 3, a high-voltage control unit 4, and a battery box connector 5, wherein the battery modules 1, the battery module switching unit 2, the high-voltage control unit 4, and the battery box connector 5 are electrically connected in sequence; the battery management unit 3 is in communication connection with the battery module 1, the battery module switching unit 2, the high-voltage control unit 4 and the battery box connector 5 respectively, and is used for performing information monitoring and fault processing on the whole battery system and identifying the opening and closing states of the voltage grade control switching units of different vehicle types.

The battery module switching unit is arranged among the plurality of battery modules, the battery module switching unit switches the matched battery modules to output voltage according to required voltage or current, and the number of the battery module switching units is reduced by 1 for the number of the battery modules.

Assuming that a certain electric vehicle has M battery boxes, each battery box has N battery modules and N-1 battery module switching units, the electric vehicle has M (N-1) battery module switching units in total, and the switching times X are calculated according to the need₁The calculation formula is as follows:

wherein, V₁Voltage of each battery module, V₂For the required voltage of the battery box, the switching frequency of each battery box is X₁，X₁Taking an integer, wherein X is the maximum switching frequency of each battery box; after the battery management unit calculates the switching times according to the required voltage, a switching command is issued to the battery module switching unit through CAN communication, and after the battery switching unit acts, the output voltage of the battery box meets the required voltage of the electric vehicle.

After each switching is completed, the storage unit stores the parameters of each switching operation in a matrix mode, the storage matrix is P, the parameters of each switching operation are A, and the expression of the storage matrix P is as follows:

P＝{A₁,A₂,A₃.....A_i}

wherein, P is a memory matrix, A is a parameter of each switching work, and the expression of A is as follows:

A＝{V₁∩V₂∩X₁}；

when switching is needed, the battery management unit communicates with the storage unit, the parameter A of each switching operation which is the same as the required voltage of the battery box is called in the storage matrix, and the switching times X of the battery box are obtained from the parameter A of the switching operation₁。

The battery box connector is provided with a power output interface DC +, a power output interface DC-, an output interface PE, a plurality of groups of communication interfaces and a plurality of groups of auxiliary power interfaces, so that a high-voltage power supply, communication information interaction and a low-voltage auxiliary power supply channel can be provided between the battery box and the electric vehicle.

Preferably, the high-voltage control unit has a pre-charging function, and the high-voltage control unit can communicate with the battery management unit to control the on-off state of the high-voltage output, so that the charging and discharging requirements of the battery are met.

Preferably, a voltage sensor and a current sensor are arranged on the voltage output bus, the voltage sensor can measure output voltage, and an alarm is given when the voltage exceeds a working range;

the current sensor can measure the current in the working state, alarm and interrupt or reduce the output power when the current exceeds the range, and prevent short circuit or overload.

Preferably, the present invention further provides an output voltage switching method, which includes the following steps:

s1, when the vehicle is powered on, the vehicle management system generates required voltage to the battery management unit;

s2, after the battery management unit receives the required voltage of the vehicle, judging whether the existing battery box meets the required voltage, when the existing battery box can not meet the required voltage, the battery management unit calculates the switching times according to the required voltage, and the switching times are calculated through the following formula:

wherein, V₁Voltage of each battery module, V₂For the required voltage of the battery box, the switching frequency of each battery box is X₁，X₁Taking an integer, wherein X is the maximum switching frequency of each battery box;

s2, the battery management unit calculates the switching times according to the required voltage, and then sends a switching command and a switching action to the battery module switching unit through CAN communication;

s3, after the battery module switching unit completes switching, if the battery box after switching meets the required voltage, ending the switching process, and starting the high-voltage control unit to perform charging protection; if the required voltage cannot be met, alarming is performed and the battery box with the rest battery modules is replaced, and then the steps S1-S2 are repeated.

S4, after each switching operation, the storage unit stores the parameter of each switching operation in a matrix manner, where the storage matrix is P, the parameter of each switching operation is a, and an expression of the storage matrix P is as follows:

P＝{A₁,A₂,A₃.....A_i}

wherein, P is a memory matrix, A is a parameter of each switching work, and the expression of A is as follows:

A＝{V₁∩V₂∩X₁}；

s5, when switching is needed, the battery management unit communicates with the storage unit, the parameter A of each switching operation which is the same as the required voltage of the battery box is called in the storage matrix, and the switching times X of the battery box are obtained from the parameter A of the switching operation₁And the switching times are sent to a battery module switching unit through CAN communication, if the battery box meets the required voltage after switching, the switching process is ended, and a high-voltage control unit is started for charging protection; if the required voltage cannot be satisfied, the alarm is given and the battery box having the remaining battery modules is replaced and then the step S2 is repeated.

After the battery management unit receives the required voltage of the vehicle as shown in fig. 4, when the existing battery system is judged not to meet the required voltage, the battery management unit issues switching actions and switching times to the battery module switching unit, wherein the switching times are less than or equal to N-1 times, and after the battery module switching unit completes switching, if the requirement is met, the switching process is ended, and the high-voltage control unit is started; if the battery system can not meet the requirement, the battery system of another battery module is alarmed to be replaced.

In summary, the present invention relates to a battery box system with multi-voltage level output, which is communicated with a vehicle to identify a required voltage level, and is connected with a battery box for outputting a plurality of voltage levels through a battery module, a battery module switching unit and a high-voltage control unit. Through battery management unit and vehicle information interaction, discernment motorcycle type and demand voltage control battery module switching unit's switching state, accomplish battery module series parallel state, high-voltage control unit control output realizes battery box voltage grade transform, promotes the compatibility of battery box system, reduces whole station running cost.

Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.