CN216231794U

CN216231794U - 24-hour monitoring system for power battery for new energy bus

Info

Publication number: CN216231794U
Application number: CN202123222198.2U
Authority: CN
Inventors: 陈新现; 陈晓冰; 叶伟宏; 陈钦松; 章莉; 余永龙
Original assignee: Xiamen Jinlong Automobile New Energy Technology Co ltd
Current assignee: Xiamen Jinlong Automobile New Energy Technology Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-04-08
Anticipated expiration: 2031-12-21

Abstract

The utility model provides a 24 hours monitored control system of power battery for new forms of energy passenger train, including the battery, VCU, BMS and the many unification controllers of supplementary accuse, BMS and VCU communication connection, BMS and VCU parallel connection back are connected with the battery, it is connected with VCU and BMS communication respectively to assist the many unification controllers of accuse, should assist the integrated DCDC that a power is 3KW in the many unification controllers of accuse, high voltage power supply is connected to DCDC's input, still through a relay module and DCDC's output series connection on the VCU circuit, DCDC's output still respectively with battery and BMS circuit series connection. The utility model adopts 3kw DCDC in the auxiliary control all-in-one controller to provide a low-voltage power supply needed by 24-hour monitoring of the battery, reduces the use cost of the whole vehicle compared with the customized DCDC scheme on the market, and can supplement power for the storage battery, prolong the service time and the service life of the storage battery.

Description

24-hour monitoring system for power battery for new energy bus

Technical Field

The utility model relates to the technical field of new energy automobile power batteries, in particular to a 24-hour monitoring system for a new energy bus power battery.

Background

With the gradual maturity of automobile motor technology and battery technology, the application of pure electric vehicles is more and more common, and pure electric vehicles represent the development direction of future automobiles. The main power source of the pure electric vehicle is a power battery pack, and the safety of the power battery pack is also the focus of attention. Among new energy automobile safety accidents related to power battery safety, power battery safety accidents caused by battery thermal runaway are one of the main reasons. On the other hand, the aging of the battery itself also poses a certain risk. The aging of a single battery unit can influence the performance of the battery unit under the influence of the service life, and meanwhile, the overall consistency difference of the battery is larger and larger, so that the safety of the battery is influenced to a certain extent. In addition, the resistance caused by aging of the laser weld of the battery pack can also cause local high temperatures, causing spontaneous combustion, subject to manufacturing process limitations. Therefore, the monitoring of the state of the power battery is very important.

At present, the existing 24-hour monitoring system of the new energy bus mainly adopts DCDC to supply power to the low-voltage power supply of the battery monitoring system, for example: the utility model with the authorization publication number of CN 211166520U discloses a monitoring system for power batteries, and also discloses a safety monitoring system for power batteries of electric vehicles, as the Chinese invention with the application publication number of CN 109606118A. However, the DCDC devices used in these monitoring systems are newly added and need to be customized, which not only increases the cost of the whole vehicle, but also needs a special control strategy to omit the communication with the devices, thereby increasing the complexity of the system. Moreover, most of the DCDCDCDs have small power, the current power of the DCDCDCDCDs is usually about 300w, excess running work is often needed, the failure rate is high, monitoring is impossible, and meanwhile, the failure of the equipment also causes that vehicles cannot be charged, and complaints of users are caused.

Disclosure of Invention

The utility model provides a 24-hour monitoring system for a power battery for a new energy bus, which aims to solve the problems that the DCDC adopted by the conventional power battery monitoring system is newly added equipment, the cost of the whole bus is increased, the power is low, and the failure rate is high due to frequent excessive operation.

The utility model adopts the following technical scheme:

the 24-hour monitoring system for the power battery for the new energy passenger car comprises a storage battery, a VCU (vertical charging unit) and a BMS (battery management unit), wherein the BMS is in communication connection with the VCU, the BMS is connected with the VCU in parallel and then is connected with the storage battery, the 24-hour monitoring system for the power battery further comprises an auxiliary control all-in-one controller, the auxiliary control all-in-one controller is respectively in communication connection with the VCU and the BMS, a DCDC with the power being 3KW is integrated in the auxiliary control all-in-one controller, the input end of the DCDC is connected with a high-voltage power supply, the VCU circuit is further connected with the output end of the DCDC in series through a relay module, and the output end of the DCDC is further connected with the storage battery and the BMS circuit in series.

Further, the front ends of the BMS and the VCU are respectively connected in series with a manual switch.

In a preferred embodiment, an RTC module is provided inside the BMS for waking up the BMS and the VCU.

In a preferred embodiment, a button battery is disposed inside the RTC module.

In a preferred embodiment, the relay module comprises a relay coil and a contact element.

In a preferred embodiment, the BMS is in CAN communication with the VCU, and the auxiliary control all-in-one controller is in CAN communication with the VCU and the BMS respectively.

As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

1. the utility model discloses a VCU passes through relay module and assists the inside integrated 3kwDCDC output series connection of accuse unification controller more to make DCDC's output respectively with battery and BMS circuit series connection. Therefore, the low-voltage power supply which is needed to be used for monitoring 24 hours of the battery is provided by the novel 3kw DCDC adopting the auxiliary control all-in-one controller, compared with the DCDC scheme customized on the market, the use cost of the whole vehicle is reduced, meanwhile, the power can be supplied to the storage battery, and the service life of the storage battery is prolonged.

2. The BMS innovatively adopts the RTC module to count the monitoring interval time, and the battery state can be monitored after a key in the vehicle is powered off and a manual power-off mechanical switch for disconnecting the low voltage of the whole vehicle is turned off. And when the RTC module works, an internal button cell is adopted, the external low-voltage storage battery is not needed for supplying power, the service life of the low-voltage storage battery can be prolonged, and the power shortage is prevented.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details. Well-known components, methods and processes are not described in detail below.

A24-hour monitoring system for a power battery for a new energy bus refers to FIG. 1 and comprises a storage battery 1, a VCU2, a BMS3 and an auxiliary control all-in-one controller 4. The VCU2 is a vehicle control unit of the pure electric vehicle, and the BMS3 is a battery management system. The BMS3 is in communication connection with the VCU4 through a CAN, and the auxiliary control all-in-one controller 4 is also in communication connection with the VCU2 and the BMS3 through the CAN respectively.

Fig. 1 of the present embodiment only shows the positive connection line, and the negative connection line is omitted and not shown, which will also enable those skilled in the art to implement the present invention.

Referring to fig. 1, the BMS3 and the VCU4 are connected in parallel and then connected to the battery 1. A manual switch 11 is arranged between the BMS3 and the storage battery 1 and between the VCU2 and the storage battery 1, so that the passenger car can cut off the connection between the storage battery 1 and all circuits in a power-off state.

The auxiliary control all-in-one controller 4 is internally integrated with a DCDC41 with the power of 3kw, and the input end of the DCDC41 is connected with a high-voltage power supply. The VCU2 circuit is also connected in series with the output of the DCDC41 via a relay module that includes a relay coil 21 and a contact element 22, and when the relay coil 21 is energized, an electromagnetic force is generated to close the contact element 22. The output terminal of DCDC41 is also connected in series with the battery 1 and the BMS3 circuits, respectively.

Referring to fig. 1, the RTC module 31 for waking up the BMS3 and the VCU2 is arranged inside the BMS3, and a button battery is arranged inside the RTC module 31, so that power supply of an external storage battery is not needed, the power shortage of the storage battery is prevented, and the service life of the storage battery can be prolonged.

In the sleep state, neither BMS3 nor VCU2 operates, and no loss occurs in the battery 1.

When needing the control, the BMS connects the normal electricity, and manual switch switches on promptly, and BMS and its VCU are awaken up to the inside RTC module messenger of BMS, and the many unification controllers of accuse are assisted in the VCU switch-on, start the last electric flow on the DCDC high voltage power supply return circuit, and convert direct current high pressure into direct current low pressure by VCU control DCDC, provide low voltage power for VCU, BMS, mend the electricity for lead-acid batteries simultaneously.

Considering that the power consumption is low when monitoring is carried out, the power consumption is usually not more than 300W, and the auxiliary control all-in-one controller can meet the monitoring requirement without starting water cooling.

According to the utility model, the low-voltage power supply conversion is carried out by adopting the DCDC with 3kW inside the all-in-one battery, and the cooperation of the DCDC and the RTC module inside the BMS is realized, so that the battery state monitoring can be realized after the key of the vehicle is powered off and the manual switch of the low-voltage storage battery of the whole vehicle is switched off.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims

1. A24-hour monitoring system for a power battery of a new energy bus comprises a storage battery, a VCU and a BMS, wherein the BMS is in communication connection with the VCU, and is connected with the storage battery after being connected with the VCU in parallel, and the monitoring system is characterized in that: the auxiliary control all-in-one controller is in communication connection with the VCU and the BMS respectively, a DCDC with the power of 3KW is integrated in the auxiliary control all-in-one controller, the input end of the DCDC is connected with a high-voltage power supply, the VCU circuit is connected with the output end of the DCDC in series through a relay module, and the output end of the DCDC is connected with the storage battery and the BMS circuit in series respectively.

2. The 24-hour monitoring system for the power battery of the new energy bus as claimed in claim 1, characterized in that: the front ends of the BMS and the VCU are respectively connected with a manual switch in series.

3. The 24-hour monitoring system for the power battery of the new energy bus as claimed in claim 2, characterized in that: an RTC module used for waking up the BMS and the VCU is arranged in the BMS.

4. The 24-hour monitoring system for the power battery of the new energy bus as claimed in claim 3, characterized in that: a button battery is arranged in the RTC module.

5. The 24-hour monitoring system for the power battery of the new energy bus as claimed in claim 1, characterized in that: the relay module includes a relay coil and a contact element.

6. The 24-hour monitoring system for the power battery of the new energy bus as claimed in claim 1, characterized in that: the BMS is in communication connection with the VCU through CAN, and the auxiliary control all-in-one controller is in communication connection with the VCU and the BMS respectively through CAN.