CN211166520U

CN211166520U - Monitoring system of power battery

Info

Publication number: CN211166520U
Application number: CN201922052685.5U
Authority: CN
Inventors: 卫云峰
Original assignee: Wuhu Stc Battery System Ltd
Current assignee: Wuhu Stc Battery System Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-08-04
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a monitoring system of power battery, including battery control unit BCU, battery management unit BMU, the battery, TBOX, DCDC converter, power battery, the DCDC converter is connected to the power battery output, battery control unit BCU power supply input is connected respectively to the power supply output of DCDC converter, TBOX power supply input and battery control unit BCU's enable awakening up the input, battery control unit BCU and TBOX are connected respectively through the rocker switch to the power supply output of battery, battery control unit BCU connects battery management unit BMU, DCDC converter, TBOX respectively through the CAN communication; and the high-side driving output end of the battery control unit is connected with the driving input end of the DCDC converter. The utility model discloses simple structure, safe and reliable can drive each unit work of awakening up in the BMS system with the DCDC converter when the parking to drive BMS starts to patrol and examine the battery state and feed back to backstage terminal under the parking state, accomplish to detect the battery state at the parking state.

Description

Monitoring system of power battery

Technical Field

The invention relates to the field of power battery safety monitoring, in particular to a novel power battery monitoring system.

Background

With the vigorous popularization and popularity of the electric automobile in China, the application of the power battery is more and more mature and common. The customer is when promoting power battery system energy density, also more and more high to the security performance requirement of power battery. In addition to adopting safer products in design materials, security monitoring and control must also be added to the application strategy. At present, in the design scheme of the whole power battery system, a BMS monitors the whole battery system in real time when a vehicle runs and is charged, and manages, controls and reports possible faults. However, in the parking power-off state, the BMS is in a power-off or sleep state and the entire battery system is in a non-monitoring state in consideration of power consumption of electrical equipment of the entire vehicle. Because parameters such as insulation, cell temperature, cell voltage and the like in the battery system can not be known, the safety state of the power battery can not be known. To solve such problems, a new power battery scheme is needed to balance the power consumption of the whole vehicle and monitor the battery system parameters

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a monitoring system of a power battery, which is used for realizing battery monitoring in a parking state.

In order to achieve the purpose, the invention adopts the technical scheme that: a monitoring system of a power battery comprises a Battery Control Unit (BCU), a Battery Management Unit (BMU), a storage battery, a TBOX (tunnel boring machine), a DCDC converter and a power battery, wherein the output end of the power battery is connected with the DCDC converter, the power supply output end of the DCDC converter is respectively connected with the power supply input end of the BCU, the power supply input end of the TBOX and the enabling awakening input end of the BCU, the power supply output end of the storage battery is respectively connected with the BCU and the TBOX through rocker switches, and the BCU is respectively connected with the BMU, the DCDC converter and the TBOX through CAN communication; and the high-side driving output end of the battery control unit is connected with the driving input end of the DCDC converter.

An isolation diode is respectively arranged between the power supply output end of the DCDC converter and the power supply input end of the battery control unit BCU, and between the power supply output end of the storage battery and the power supply input end of the battery power supply control unit BCU; and an isolation diode is respectively arranged between the power supply output end of the DCDC converter and the power supply input end of the TBOX, and between the power supply output end of the storage battery and the power supply input end of the TBOX.

The monitoring system also comprises a charging state signal detection unit and a key signal detection unit, wherein the charging state detection unit respectively sends detected charging state signals to an activation input end of the battery control unit BCU and an activation input end of the DCDC converter; the key signal detection unit sends the detected key gear signal to an activation input end of the battery control unit BCU and an activation input end of the DCDC converter respectively.

The TBOX is connected with the background terminal and used for uploading monitoring data.

The invention has the advantages that: simple structure, safe and reliable can drive each unit work in awakening the BMS system with the DCDC converter when the parking to drive BMS starts to patrol and examine the battery state and feed back to backstage terminal under the parking state, accomplish and to the detection of battery state in the parking state, improve the reliability of whole car security performance and control. Can let BMS periodic awakening and patrol and examine power battery system under the vehicle parking in the electrical state, can do detection and evaluation to insulating, monomer voltage, temperature rise isoparametric in the power battery system to show at the terminal backstage, to the effectual control of power battery's state. The integrity of the power battery system is improved, the power battery can be immediately powered off after the inspection is finished, and the low voltage of the whole vehicle and the loss of the power battery are not influenced

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

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

fig. 2 is a schematic diagram of a specific implementation structure of the present invention.

Detailed Description

The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, a monitoring system for a power battery includes a battery control unit BCU, a battery management unit BMU, a storage battery, a TBOX, a DCDC converter, and a power battery, wherein an output end of the power battery is connected to the DCDC converter, a power supply output end of the DCDC converter is respectively connected to a power supply input end of the battery control unit BCU, a power supply input end of the TBOX, and an enable wake-up input end of the battery control unit BCU, a power supply output end of the storage battery is respectively connected to the battery control unit BCU and the TBOX through rocker switches, and the battery control unit BCU is respectively connected to the battery management unit BMU, the DCDC converter, and the TBOX through CAN communication; and the high-side driving output end of the battery control unit is connected with the driving input end of the DCDC converter. The BCU of the BMS in the sleep state is waken up through the driving control of the power supply output of the DCDC converter, so that the BCU realizes the self-check of the battery system to realize the detection in the parking state.

The monitoring system also comprises a charging state signal detection unit and a key signal detection unit, wherein the charging state detection unit respectively sends the detected charging state signals to an activation input end of the battery control unit BCU and an activation input end of the DCDC converter; the key signal detection unit sends the detected key gear signal to an activation input end of the battery control unit BCU and an activation input end of the DCDC converter respectively. The TBOX is connected with the background terminal and used for uploading monitoring data.

A monitoring principle of a monitoring system of a power battery comprises that whether the power battery is in a parking state or not is judged according to a charging state signal and a key signal, when the power battery is in the parking state, a DCDC converter is powered off to enter a sleep state and awakens an internal control circuit according to an awakening time node set during powering off, the charging state signal, the key signal and a high-side driving signal of a battery control unit are detected after awakening, when the DCDC converter, the key signal and the high-side driving signal disappear, the DCDC converter outputs 24V power to be TBOX and supplies power to a battery management system and simultaneously drives and awakens a battery control unit BCU, the battery control unit carries out self-checking to obtain battery monitoring data, sends the self-checking monitoring data to the TBOX through a whole vehicle CAN.

After the TBOX sends data to the background terminal, the battery control unit stops outputting high-side drive to the DCDC converter and simultaneously sends a message through the CAN to request the DCDC converter to be powered off to enter a dormant state.

The awakening time node set during power-off comprises: and setting a plurality of time points with different time intervals from the reference time origin as awakening time nodes by taking the parking state as the reference time origin. When the battery control unit of the battery management system is awakened at the awakening time node and the SOC of the power battery is detected to be lower than a set value, the battery control unit BCU is awakened to be invalid, the battery control unit BCU prohibits a subsequent self-checking program and sends a control signal to the DCDC converter through CAN communication to control the DCDC converter to stop outputting power supply.

As shown in fig. 1, in the power supply aspect of fig. 1: the BCU is powered by two power supplies, namely a lead storage battery 24V and a power battery 24V of the whole vehicle are converted by DCDC, and two diodes are arranged between the two power supplies for isolation to prevent series connection. And 24V of DCDC supplies power to the BCU and enables and wakes up the BCU. The BMU is powered by the BCU.

The whole vehicle TBOX is also supplied with power by 24V of a lead storage battery and a power battery of the whole vehicle through DCDC conversion, and two diodes are arranged between the two power supplies for isolation, so that series connection is prevented. In the communication aspect of the fig. 1, the BCU, the BMU and the DCDC carry out information interaction through the inner CAN. And the TBOX and the BCU carry out information interaction through the CAN of the whole vehicle. Under the condition that the vehicle is parked and powered off, the DCDC can periodically wake up according to the message instruction of the BCU before power failure, and the DCDC supplies power to the BCU and the TBOX and wakes up after working. After the BCU is started, the power battery system can be patrolled and examined according to software setting. And sending the inspection result to the TBOX through the CAN message form and the whole vehicle CAN, and finally reaching the background terminal. After the action is finished, the BCU sends a power-off instruction to the DCDC, and finally the DCDC and the BCU are both in a power-off or dormant state to wait for next awakening.

The main purpose of this application is under the circumstances of vehicle parking power state, carries out periodic monitoring to the power battery system on the vehicle, does periodic patrolling and examining to its insulation, electric core voltage, electric core temperature, SOC etc. and the power battery system trouble that probably takes place is prejudged to report through whole car intelligent terminal, very big improvement the security of power battery system under the parking state. The main improvement of the scheme is how to drive the units like the BCU in the wake-up BMS system. The DCDC converter is adopted to drive and control the wake-up.

As shown in fig. 2, the monitoring system can be divided into three states of driving/charging/parking according to the state of the power battery of the vehicle.

1. Driving state of vehicle

Driving state (discharge): when the vehicle runs, the whole vehicle lead-acid power supply is used for supplying power, the rocker switch is turned on, the BMS is supplied with power by the whole vehicle lead-acid power supply, and meanwhile, the KEYon signal is activated, and the BMS works. The DCDC does not output 24V because the keyon signal on the DCDC is active.

2. Vehicle state of charge

Fill electric pile A + and awaken up DCDC, DCDC outputs 24V power for BMS and TBOX, and A + awakens up BMS simultaneously. The 24V power supply of DCDC confession BMS does the isolation with whole car lead acid 24V electricity diode, and DCDC exports its operating condition to BMS through the CAN message after the work, and DCDC is as awakening signal by CAN message and high flat drive and A + simultaneously this two way signal of A + and high flat drive also are isolated, prevent the series connection.

At the moment, the BMS simultaneously uses the 24V power supplies of A + and DCDC as wake-up signals, and the two paths of signals are also isolated to prevent series connection.

If the A + signal is lost, because of being in the high level state of BMS, still CAN export high limit drive and CAN message communication normal, guarantee that DCDC still CAN work, BMS CAN obtain DCDC power supply. (after preventing A + from losing, the whole system has no low voltage, the charging relay is directly cut off with load by large current. 2.BMS can delay the power-off, first request to stop charging with the charging pile, when the charging current is 0, then cut off the charging relay, exit the charging process)

3. Vehicle parking state

When the A + signal and the key gear keyon signal disappear, the DCDC and the BMS both enter a dormant state. However, the DCDC can self-awaken the internal control circuit according to the awakening time node set during last power-off, when the fact that A +, keyon and BMS high-side driving are disappeared is detected, the DCDC outputs 24V power and awakens the BMS, the BMS reports the self-inspection state to the TBOX through the whole vehicle can after self-inspection, and finally feeds back the self-inspection state to the background terminal. After 5 minutes, the BMS stops outputting the high-side drive and requires DCDC power down through the CAN message. The DCDC enters the sleep state again according to the BMS message of the current state and the high level driving state (at this time, low level).

Periodic setting of self-wakeup monitoring scheme

No driving and charging conditions during the wake-up period: the DCDC awakens for the first time 1 hour after shutdown, the interval between the second awakening and the first awakening is 4 hours, the interval between the third awakening and the second awakening is 8 hours, the interval between the fourth awakening and the third awakening is 12 hours, and the subsequent awakening lasts 12 hours.

There are driving and charging situations in the wake-up cycle: after each driving or charging is finished, the low voltage is reduced, the low voltage is taken as a reference time origin, and the awakening periods of 1 hour, 4 hours, 8 hours and 12 hours are entered again

Self-awakening working time length: after the DCDC is awakened every time, the BMS carries out self-checking and reports the states of the CAN and the battery system of the whole vehicle. After 5 minutes, the BMS stops the high level output and notifies the DCDC to power down. If the BMS finds the SOC of the battery system is low during self-awakening, the BMS sends the awakening mode to be invalid through the can message, and subsequent awakening is forbidden. After the SOC is detected to be increased to a set value after the follow-up BMS is powered on, the self-awakening period is continuously sent

It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.

Claims

1. A monitoring system of a power battery is characterized in that: the battery management system comprises a Battery Control Unit (BCU), a Battery Management Unit (BMU), a storage battery, a TBOX (tunnel boring oxide), a direct current to direct current converter (DCDC converter) and a power battery, wherein the output end of the power battery is connected with the DCDC converter, the power supply output end of the DCDC converter is respectively connected with the power supply input end of the BCU, the power supply input end of the TBOX and the enabling awakening input end of the BCU, the power supply output end of the storage battery is respectively connected with the BCU and the TBOX through rocker switches, and the BCU is respectively connected with the BMU, the DCDC converter and the TBOX through CAN communication; and the high-side driving output end of the battery control unit is connected with the driving input end of the DCDC converter.

2. The monitoring system for a power battery according to claim 1, wherein: an isolation diode is respectively arranged between the power supply output end of the DCDC converter and the power supply input end of the battery control unit BCU, and between the power supply output end of the storage battery and the power supply input end of the battery power supply control unit BCU; and an isolation diode is respectively arranged between the power supply output end of the DCDC converter and the power supply input end of the TBOX, and between the power supply output end of the storage battery and the power supply input end of the TBOX.

3. A monitoring system for a power cell according to claim 1 or 2, characterized in that: the monitoring system also comprises a charging state signal detection unit and a key signal detection unit, wherein the charging state detection unit respectively sends detected charging state signals to an activation input end of the battery control unit BCU and an activation input end of the DCDC converter; the key signal detection unit sends the detected key gear signal to an activation input end of the battery control unit BCU and an activation input end of the DCDC converter respectively.

4. A monitoring system for a power cell according to claim 1 or 2, characterized in that: the TBOX is connected with the background terminal and used for uploading monitoring data.