Unlock instant, AI-driven research and patent intelligence for your innovation.

Power battery thermal runaway risk early warning method and early warning system

A risk warning, power battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as failure and early warning failure, and achieve the effect of effective early warning of thermal runaway risks

Active Publication Date: 2022-04-15
深蓝汽车科技有限公司
View PDF12 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through the analysis of a large number of test data, it is shown that using voltage and temperature primary signal thresholds or simple horizontal and vertical comparisons for early warning is prone to failure problems, which requires higher requirements for battery design.
For example, temperature threshold monitoring, when the distance between the battery temperature sensor and the thermal runaway cell exceeds a certain distance, the early warning may fail
[0004] In addition, the vast majority of electric vehicle battery packs currently on the market are only equipped with temperature, voltage, and current sensors; therefore, it is necessary to redevelop or optimize thermal Out-of-control early warning algorithm

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power battery thermal runaway risk early warning method and early warning system
  • Power battery thermal runaway risk early warning method and early warning system
  • Power battery thermal runaway risk early warning method and early warning system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: There are M=96 battery cells in the battery pack of a certain type of power battery. Such as figure 1As shown, for this power battery thermal runaway risk warning method, it is executed by the cloud controller arranged in the cloud. The source of calculation data is the running data uploaded by the vehicle according to the requirements of GBT32960. The vehicle does not need to add additional equipment or other requirements.

[0035] After the cloud controller receives the data uploaded by the vehicle, it first cleans the data, removes obviously wrong data, null values, and default values, and sorts the data according to the time when the vehicle terminal data was generated; Methods include:

[0036] The first step is to obtain the cell voltage of all battery cells in the battery pack at each moment, and then execute the second step.

[0037] In the second step, 5 (m=5 in this embodiment) battery cells are sequentially selected according to the order of c...

Embodiment 2

[0053] Embodiment 2: There are M=96 battery cells in the battery pack of a certain type of power battery. Such as figure 2 As shown, for this type of power battery thermal runaway risk warning method, it is executed by the vehicle-side controller (such as BMS) arranged at the vehicle end. The specific warning methods include: .

[0054] The first step is to obtain the cell voltage of all battery cells in the battery pack at each moment, and then execute the second step.

[0055] The second step is to use the formula: Δu i = u i -u' i , calculate the cell voltage increment Δu of the i-th battery cell at each time i , and then go to step three. Among them, i takes all integers from 1 to 96 in turn, u i Indicates the cell voltage of the i-th battery cell at the current moment, u′ i Indicates the cell voltage of the i-th battery cell at the previous moment, and the time difference between the current moment and the previous moment is equal to the cell voltage sampling peri...

Embodiment 3

[0068]Embodiment 3: There are M=96 battery cells in the battery pack of a certain type of power battery. Such as image 3 As shown, for this type of power battery thermal runaway risk warning method, it is executed by the vehicle-side controller (such as BMS) arranged at the vehicle end. The specific warning methods include: .

[0069] The first step is to obtain the cell voltage of all battery cells in the battery pack at each moment, and then execute the second step.

[0070] In the second step, 5 (m=5 in this embodiment) battery cells are sequentially selected according to the order of cell voltage from low to high, using the formula: Δu j = u j -u' j , calculate the cell voltage increments of the five battery cells at each moment, and then execute the third step. Among them, Δu j Indicates the cell voltage increment of the jth battery cell among the 5 battery cells, j takes all integers from 1 to 5 in turn, u j Indicates the cell voltage of the jth battery cell at th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a power battery thermal runaway risk early warning method and early warning system. The early warning method comprises the following steps: acquiring single voltage of all single batteries in a battery pack at each moment; calculating the monomer voltage increment delta ui of the ith battery monomer at each moment; determining a reference monomer voltage of the battery pack at each moment; determining an actual reference monomer voltage increment delta u at each moment; calculating the monomer voltage increment ratio Ki of the ith battery monomer at each moment; and judging whether alarm is needed by using a numerical method or a slope method. According to the method, the problem that a primary single voltage signal threshold early warning method may fail can be solved, the design of a stock power battery does not need to be changed, and effective early warning of the thermal runaway risk of the power battery can be achieved.

Description

technical field [0001] The invention belongs to the field of power battery monitoring, and in particular relates to a power battery thermal runaway risk early warning method and an early warning system. Background technique [0002] In order to protect the life and property safety of drivers and passengers, the mandatory standard GB38031-2020 clearly requires that the battery pack or system should provide an alarm signal 5 minutes before the thermal spread caused by the thermal runaway of the battery cells, which will cause danger to the passenger compartment. One of the keys to meeting the requirements of this standard lies in a reliable early warning algorithm. [0003] At present, the main schemes that have been implemented in the industry include: temperature threshold method, voltage threshold method, battery case pressure threshold method, battery pack internal air pressure method, battery pack gas composition or particle concentration method, etc. For example, CN1103...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48
CPCY02E60/10
Inventor 徐舰波万红兵王钢蒲江郭祥文吴正国梁友
Owner 深蓝汽车科技有限公司