Direct-current quick charging device for double-pack energy storage system of motor home and control method of direct-current quick charging device

Abstract

The invention relates to the field of motor home high-voltage energy storage, in particular to a direct-current fast charging device for a motor home double-pack energy storage system and a control method of the direct-current fast charging device. The motor home double-pack energy storage system is charged through external power supply equipment, and the external power supply equipment comprises a new energy automobile direct-current charging pile; the motor home double-pack energy storage system comprises double high-voltage battery packs, an all-in-one controller, a direct-current quick charging pile and a direct-current quick charging device. Direct current output by the new energy automobile direct current charging pile efficiently charges the double-high-voltage battery pack through the direct current quick charging device. And the direct current output by the high-voltage battery pack is converted into 12V direct current and 220V alternating current through the all-in-one controller, so as to supply power to 12V direct current and 220V alternating current electric equipment. According to the direct-current fast charging device and the control method thereof, direct-current fast charging of the double packs can be effectively and reasonably controlled according to the devices of the motor home energy storage system and real-time working conditions, the charging efficiency is improved, the charging capacity of the double packs is improved, and the service life of the double packs is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage energy storage for recreational vehicles, and in particular to a direct current fast charging device for a dual-pack energy storage system of a recreational vehicle and a control method thereof. Background Art

[0002] With the improvement of living standards, many people like to travel by car, and RVs have gradually appeared in the public's field of vision. As a new way of travel and accommodation, RVs have internal intelligent equipment and high-power household appliances, making RV power supply a headache.

[0003] The capacity of commonly used low-voltage energy storage systems is too low to guarantee the long-term use of household appliances and the inability to quickly replenish electricity. Therefore, the parallel connection of small-volume high-voltage battery packs can not only optimize the layout of the RV, but also increase the capacity of the battery pack, and at the same time meet the needs of customers with single-pack and dual-pack power supply (consisting of a main pack and a secondary pack, also known as the first battery pack and the second battery pack).

[0004] In the current public technologies on the market, the control methods for dual-pack DC fast charging are mostly the following, for example: the main pack and the DC fast charging pile charge interactively, and then charge the secondary pack after it is fully charged, or enter the parallel mode when the voltage of the secondary pack is close to that of the main pack. In actual application scenarios, this control method cannot be adjusted according to the real-time power of the dual packs and the charging power required, so that the characteristics of the main and secondary packs cannot be fully utilized, and problems such as slow charging, uneven charging, and low charging efficiency cannot be avoided. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a DC fast charging device for a dual-pack energy storage system of a motorhome and a control method thereof, which can effectively and reasonably control the dual-pack DC fast charging according to the device and real-time operating conditions of the motorhome energy storage system, thereby ensuring normal charging and safety of the motorhome, solving the problems of slow dual-pack charging, uneven charging, and low charging efficiency, thereby improving the charging capacity and performance of the dual-pack.

[0006] An embodiment of the present invention is implemented as follows: a control method for DC fast charging of a dual-pack energy storage system for a motorhome, comprising: obtaining the working parameters of the dual-pack energy storage system after being awakened; determining that the working parameters can simultaneously satisfy that the dual-pack energy storage system detects the plug-in signal A+ to wake up, and the low-voltage starting switch KL15 is not activated; monitoring the real-time power and voltage values ​​of the dual packs in the working parameters in the system charging state, and providing a parallel calibrated charging power difference; determining whether the current dual-pack power difference is less than or equal to the parallel calibrated charging power difference; when it is determined that the current dual-pack power difference is less than or equal to the parallel charging power difference, establishing a connection between the charging pile and the battery pack through the DC fast charging device and exchanging information, and the dual pack enters the parallel charging mode.

[0007] Preferably, it also includes: when it is determined that the working parameters cannot simultaneously satisfy the dual-pack energy storage system detecting the gun plugging power signal A+ to wake up, and the low-voltage starting switch KL15 is not activated, determining whether the dual-pack energy storage system detects the gun plugging power signal A+ in the discharge state; when it is determined that the dual-pack energy storage system detects the gun plugging power signal A+ in the discharge state, the dual-pack energy storage system enters the charging process; when it is determined that the gun plugging power signal A+ is not detected in the discharge state of the dual-pack energy storage system, the dual-pack energy storage system still discharges normally.

[0008] Preferably, it also includes: when it is determined that the working parameters are satisfied at the same time that the dual-pack energy storage system detects the plug-in power signal A+ to wake up, the low-voltage starting switch KL15 is not activated, and it is determined that the current dual-pack power difference is not less than or equal to the parallel charging power difference, determining whether the real-time power of the first battery pack is less than or equal to the real-time power of the second battery pack; determining that the real-time power of the first battery pack is less than or equal to the real-time power of the second battery pack, establishing a connection between the charging pile and the first battery pack through the DC fast charging device and exchanging information, and the first battery pack enters the single-pack charging mode; when it is determined that the real-time power of the first battery pack is greater than the real-time power of the second battery pack, establishing a connection between the charging pile and the second battery pack through the DC fast charging switching device and exchanging information, and the second battery pack enters the single-pack charging mode.

[0009] Preferably, it also includes: when it is determined that the RV dual-battery pack energy storage system enters the single-pack charging mode, determining whether the current power difference of the dual packs is less than or equal to the parallel calibrated charging power difference.

[0010] Preferably, it also includes: when it is determined that the current power difference of the two packs is less than or equal to the parallel calibrated charging power difference, a high voltage is requested from another battery pack through a DC fast charging device, and the dual-pack energy storage system enters a parallel charging mode.

[0011] Preferably, the dual-pack energy storage system wake-up mode includes two modes: wake-up by the plug-in signal A+ of the DC charging station and wake-up by the low-voltage starting switch KL15.

[0012] A DC fast charging device for a dual-pack energy storage system of a motorhome, the DC fast charging device comprising: a charging signal line switching device, used to control the on-off of a low-voltage charging signal line used for connecting and interacting a DC fast charging pile with a battery pack through an enable signal sent from the outside; a storage module, used to store the RV high-voltage dual-pack parallel calibrated charging power difference; an acquisition module, used to acquire real-time values ​​and hard-wire signals of the RV high-voltage dual-pack energy storage system; a control module, respectively connected to the storage module, the acquisition module and the output enable module, used to retrieve the RV dual-pack calibrated parallel charging power difference from the storage module, retrieve the real-time values ​​and hard-wire signals of the RV parameters from the acquisition module, and reasonably and effectively perform charging control based on the real-time values ​​of the RV high-voltage dual-pack energy storage system, thereby efficiently and reasonably controlling the dual-pack energy storage system to interact with the DC fast charging pile and enter a suitable charging mode; an output enable module, used for the control module to switch and control the charging signal line switching device.

[0013] Preferably, the low-voltage signal line includes 5 low-voltage charging signal lines (A+\A-\CC2\S+\S-) used for connecting and interacting with the DC fast charging pile, and the hard-wire signal includes the plug-in signal A+ and the start switch KL15.

[0014] Preferably, it also includes: the output enable module can realize the connection of the low-voltage charging signal line of the DC fast charging pile with the first battery pack, or with the second battery pack by sending an enable signal to the charging signal line switching device, so as to realize the connection and interaction between the battery pack with low power and the DC fast charging pile during charging, thereby solving the problems of slow dual-pack charging, uneven charging, and low charging efficiency.

[0015] The present invention provides a DC fast charging device and a control method for a dual-pack energy storage system for a motorhome. Through the DC fast charging device and the control method, the dual-pack DC fast charging can be effectively and reasonably controlled according to the device and real-time working conditions of the motorhome energy storage system, thereby improving the charging efficiency and increasing the charging capacity and service life of the dual pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the control method for DC fast charging of a dual-pack energy storage system for an RV.

[0017] Figure 2 The present invention is a flow chart of the control method for DC fast charging of a dual-pack energy storage system for an RV.

[0018] Figure 3 Schematic diagram of the device used for DC fast charging of the RV dual-pack energy storage system.

[0019] In the attached drawings: 210 - storage module, 220 - acquisition module, 230 - control module, 240 - output enabling module, 250 - charging signal line cutting device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

[0021] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0022] See also Figure 1 and Figure 2 , an embodiment of the present invention provides a control method for DC fast charging of a dual-pack energy storage system for a motorhome, the control method for DC fast charging of a dual-pack energy storage system for a motorhome comprising: Obtain the working parameters of the dual-pack energy storage system after being awakened; determine that the working parameters can simultaneously satisfy the dual-pack energy storage system detecting the gun plug signal A+ awakening, and the low-voltage starting switch KL15 is not activated; monitor the real-time power and voltage values ​​of the dual packs in the working parameters in the system charging state, and provide a parallel calibrated charging power difference; determine whether the current dual-pack power difference is less than or equal to the parallel calibrated charging power difference; when it is determined that the current dual-pack power difference is less than or equal to the parallel charging power difference, establish a connection between the charging pile and the battery pack through the DC fast charging device and exchange information, and the dual pack enters the parallel charging mode.

[0023] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, it also includes: when it is determined that the working parameters cannot simultaneously satisfy the dual-pack energy storage system detecting the gun plug power signal A+ to wake up, and the low-voltage starting switch KL15 is not activated, determining whether the dual-pack energy storage system detects the gun plug power signal A+ in the discharge state; when it is determined that the dual-pack energy storage system detects the gun plug power signal A+ in the discharge state, the dual-pack energy storage system enters the charging process; when it is determined that the gun plug power signal A+ is not detected in the discharge state of the dual-pack energy storage system, the dual-pack energy storage system still discharges normally.

[0024] like Figure 1 and Figure 2As shown, as a preferred embodiment of the present invention, it also includes: when it is determined that the working parameters are satisfied at the same time that the dual-pack energy storage system detects the plug-in power signal A+ wake-up, the low-voltage starting switch KL15 is not activated, and it is determined that the current dual-pack power difference is not less than or equal to the parallel charging power difference, whether the real-time power of the first battery pack is less than or equal to the real-time power of the second battery pack is determined; when it is determined that the real-time power of the first battery pack is less than or equal to the real-time power of the second battery pack, the charging pile is connected to the first battery pack through the DC fast charging device and information is exchanged, and the first battery pack enters the single-pack charging mode; when it is determined that the real-time power of the first battery pack is greater than the real-time power of the second battery pack, the charging pile is connected to the second battery pack through the DC fast charging switching device and information is exchanged, and the second battery pack enters the single-pack charging mode.

[0025] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, it also includes: when it is determined that the RV dual-battery pack energy storage system enters the single-pack charging mode, determining whether the current power difference of the dual packs is less than or equal to the parallel calibrated charging power difference.

[0026] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, it also includes: when it is determined that the current power difference of the two packs is less than or equal to the parallel calibrated charging power difference, a high voltage is requested to the other battery pack through a DC fast charging device, and the dual-pack energy storage system enters a parallel charging mode.

[0027] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, the dual-pack energy storage system wake-up mode is divided into two modes: wake-up by the plug-in signal A+ of the DC charging station and wake-up by the low-voltage starting switch KL15.

[0028] like Figure 3As shown, a DC fast charging device for a dual-pack energy storage system of a motorhome, the DC fast charging device comprising: a charging signal line switching device 250, used to control the on-off of a low-voltage charging signal line for connecting and interacting a DC fast charging pile with a battery pack through an external enable signal; a storage module 210, used to store the calibrated charging power difference of the motorhome high-voltage dual-pack parallel connection; an acquisition module 220, used to collect real-time values ​​and hard-line signals of the motorhome high-voltage dual-pack energy storage system; a control module 230, respectively connected to the storage module 210, the acquisition module 220 and the The output enable module 240 is connected to retrieve the difference in the calibrated parallel charging power of the RV dual-pack from the storage module 210, retrieve the real-time values ​​and hard-wire signals of the RV parameters from the acquisition module 220, and reasonably and effectively perform charging control based on the real-time values ​​of the RV high-voltage dual-pack energy storage system, thereby efficiently and reasonably controlling the dual-pack energy storage system to interact with the DC fast charging pile and enter a suitable charging mode; the output enable module 240 is used for the control module 230 to switch and control the charging signal line switching device 250.

[0029] like Figure 3 As shown, as a preferred embodiment of the present invention, the low-voltage signal line includes 5 low-voltage charging signal lines for connecting and interacting with the DC fast charging pile, which are A+\A-\CC2\S+\S-, and the hard-wire signal includes the plug-in signal A+ and the start switch KL15.

[0030] like Figure 3 As shown, as a preferred embodiment of the present invention, it also includes: the output enable module 240 can realize the connection of the low-voltage charging signal line of the DC fast charging pile with the first battery pack, or with the second battery pack by sending an enable signal to the charging signal line switching device 250, so as to realize the connection and interaction between the battery pack with low power and the DC fast charging pile during charging, thereby solving the problems of slow charging of dual packs, uneven charging, and low charging efficiency.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A DC fast charging device for a motorhome dual-pack energy storage system, characterized in that: A DC fast charging device is included, and the DC fast charging device includes: A charging signal line switching device, used to control the on / off of a low-voltage charging signal line used for connecting and interacting a DC fast charging pile with a battery pack through an external enable signal; A storage module, used to store the calibrated charging power difference of the RV high-voltage dual-pack in parallel; A collection module, used to collect real-time values ​​and hard-line signals of the RV high-voltage dual-pack energy storage system; A control module, connected to the storage module, the acquisition module and the output enable module respectively, for retrieving the difference in the calibrated parallel charging power of the RV dual-pack from the storage module, retrieving the real-time value and hard-line signal of the RV parameters from the acquisition module, and reasonably and effectively performing charging control according to the real-time value of the RV high-voltage dual-pack energy storage system, thereby efficiently and reasonably controlling the dual-pack energy storage system to interact with the DC fast charging pile and enter a suitable charging mode; The output enabling module is used for the control module to perform switching control on the charging signal line switching device.

2. The DC fast charging device for a RV dual-pack energy storage system according to claim 1 is characterized in that: The low-voltage signal line includes five low-voltage charging signal lines used for connecting and interacting with the DC fast charging pile, which are A+\A-\CC2\S+\S-, and the hard-line signal includes the plug-in signal A+ and the start switch KL15.

3. The DC fast charging device for a dual-pack energy storage system for a motorhome according to claim 2 is characterized in that: Also includes: The output enable module can realize the connection of the low-voltage charging signal line of the DC fast charging pile with the first battery pack, or with the second battery pack by sending an enable signal to the charging signal line switching device, so as to realize the connection and interaction between the battery pack with low power and the DC fast charging pile during charging, thereby solving the problems of slow charging of dual packs, uneven charging, and low charging efficiency.

4. A DC fast charging device for a motorhome dual-pack energy storage system and a control method thereof, characterized in that: The invention comprises a DC fast charging device and a control method for a dual-pack energy storage system for a motorhome as described in claims 1 to 3, wherein the control method comprises: Obtaining the working parameters of the dual-packet energy storage system after waking up; Determine that the working parameters can simultaneously satisfy that the dual-pack energy storage system detects the gun plug signal A+ wake-up, and the low-voltage start switch KL15 is not activated; Monitor the real-time power and voltage values ​​of the dual packs in the working parameters under the system charging state, and provide parallel calibration charging power difference; Determine whether the current dual-pack power difference is less than or equal to the parallel calibration charging power difference; When it is determined that the current power difference between the two packs is less than or equal to the parallel charging power difference, the charging pile and the battery pack are connected through the DC fast charging device and information is exchanged, and the two packs enter the parallel charging mode.

5. The DC fast charging device and control method for a motorhome dual-pack energy storage system according to claim 4 is characterized in that: Also includes: When it is determined that the working parameters cannot simultaneously satisfy the dual-pack energy storage system detecting the gun plug power signal A+ to wake up, and the low-voltage start switch KL15 is not activated, determining whether the dual-pack energy storage system detects the gun plug power signal A+ in the discharge state; When it is determined that the dual-pack energy storage system detects the plug-in power signal A+ in the discharge state, the dual-pack energy storage system enters the charging process; When it is determined that the gun plug power signal A+ is not detected in the discharge state of the dual-pack energy storage system, the dual-pack energy storage system still works normally in discharge.

6. The DC fast charging device and control method for a motorhome dual-pack energy storage system according to claim 4 is characterized in that: Also includes: When it is determined that the working parameters are satisfied at the same time that the dual-pack energy storage system detects the plug-in power signal A+ wake-up, the low-voltage start switch KL15 is not activated, and it is determined that the current dual-pack power difference is less than or equal to the parallel charging power difference, it is determined whether the real-time power of the first battery pack is less than or equal to the real-time power of the second battery pack; Determine that the real-time power of the first battery pack is less than or equal to the real-time power of the second battery pack, establish a connection between the charging pile and the first battery pack through the DC fast charging device, and exchange information, and the first battery pack enters a single-pack charging mode; When it is determined that the real-time power of the first battery pack is greater than the real-time power of the second battery pack, the charging pile is connected to the second battery pack through the DC fast charging switching device and information is exchanged, and the second battery pack enters the single-pack charging mode.

7. The DC fast charging device and control method for a motorhome dual-pack energy storage system according to claim 6 is characterized in that: Also includes: When it is determined that the RV dual-battery pack energy storage system enters the single-pack charging mode, it is determined whether the current power difference of the dual packs is less than or equal to the parallel calibrated charging power difference.

8. The DC fast charging device and control method for a motorhome dual-pack energy storage system according to claim 7 is characterized in that: Also includes: When it is determined that the current power difference of the two packs is less than or equal to the parallel calibrated charging power difference, a high voltage is requested to the other battery pack through a DC fast charging device, and the dual-pack energy storage system enters a parallel charging mode.

9. The DC fast charging device and control method for a motorhome dual-pack energy storage system according to claim 8, characterized in that: The dual-pack energy storage system wake-up methods include two methods: wake-up by the plug-in signal A+ of the DC charging station and wake-up by the low-voltage starting switch KL15.

Images