Method and system for preventing thermal runaway of battery cell based on detection of escape gas
A technology for escaping gas and thermal runaway, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as difficult to control thermal runaway, hidden safety hazards, and high suppression costs, so as to avoid thermal runaway, reduce costs, and avoid life and property Safety Risk Effects
Pending Publication Date: 2022-04-15
深蓝汽车科技有限公司
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[0002] With the popularization of new energy vehicles, power battery safety issues are becoming more and more prominent, and various types of power battery thermal runaway phenomena continue to appear in the market. GB 38031 puts forward a 5-minute safety escape requirement for the battery, but for the user's property safety, and The safety concerns of users for new energy vehicle batteries still have a major impact. The current detection technology for thermal runaway of batteries in the industry is relatively mature, which is basically divided into two categories: alarm and early warning: one is to rely on air pressure, smoke, etc. when thermal runaway occurs. Gas, voltage, temperature and other signals identify the characteristics of thermal runaway and give an alarm, but this behavior is still an after-the-fact behavior. Alarming after thermal runaway has occurred has certain safety risks, and it is difficult to control thermal runaway after it occurs, and the suppression cost is high
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[0031] The present invention will be further described below in conjunction with accompanying drawing.
[0032] Due to some usage conditions and some factors of the battery cell itself, the power battery may experience overcharge, overcurrent, overtemperature, internal short circuit, etc. These conditions lead to an abnormal chemical reaction inside the cell, which produces some relatively low-concentration gases in the thermal runaway stage, such as hydrogen, carbon monoxide, carbon dioxide, and other organic mixed gases, and passes through the cell explosion-proof valve or the expansion cell. The case escapes. Although thermal runaway has not occurred in the cell where this kind of gas escapes, thermal runaway will occur after a period of time (generally ranging from 10 minutes), and a large amount of gas and heat will be generated when thermal runaway occurs. Therefore, timely detection and treatment in the early stage of gas escape can avoid the occurrence of thermal runa...
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The invention discloses a method and a system for preventing thermal runaway of a battery cell based on detection of escape gas. The method comprises the following steps: step 1, detecting the concentration of preset gas in a battery box body through a gas sensor; 2, if the gas sensor detects that the concentration of the preset gas exceeds a set threshold value, an alarm signal is sent to a BMS; 3, after the BMS receives the alarm signal sent by the gas sensor, whether the vehicle is in a driving state or not is judged according to the driving state signal, if the vehicle is in the driving state, the charging and discharging power is limited, and the relay is cut off within preset time; after the BMS receives the alarm signal sent by the gas sensor, whether the vehicle is in a charging mode or not is judged according to the working mode signal, if the vehicle is in the charging mode, the relay is disconnected, and charging is stopped. When a certain battery cell is abnormal in gas escape, detection is carried out before thermal runaway of the battery cell occurs, and the battery and a whole vehicle system immediately start countermeasures to prevent thermal runaway of the battery cell.
Description
technical field [0001] The invention belongs to the technical field of prevention and control of battery thermal runaway, and in particular relates to a method and system for preventing battery thermal runaway based on detection of escaped gas. Background technique [0002] With the popularization of new energy vehicles, power battery safety issues are becoming more and more prominent, and various types of power battery thermal runaway phenomena continue to appear in the market. GB 38031 puts forward a 5-minute safety escape requirement for the battery, but for the user's property safety, and The safety concerns of users for new energy vehicle batteries still have a major impact. The current detection technology for thermal runaway of batteries in the industry is relatively mature, which is basically divided into two categories: alarm and early warning: one is to rely on air pressure, smoke, etc. when thermal runaway occurs. Signals such as gas, voltage, and temperature iden...
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IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/48H01M10/486H01M10/425Y02E60/10
Inventor徐前张友群邓承浩牟丽莎杨辉前
Owner深蓝汽车科技有限公司