CN-121983712-A - Battery pack management device and method

CN121983712ACN 121983712 ACN121983712 ACN 121983712ACN-121983712-A

Abstract

The battery pack management device comprises a control unit, a plurality of sensors, at least two bidirectional breathing units and a control unit, wherein the sensors are connected with the control unit and used for collecting multidimensional state information of a battery pack, the at least two bidirectional breathing units are arranged on a shell of the battery pack and connected with the control unit, and the control unit is configured to judge the running state of the battery pack based on the multidimensional state information and generate control instructions for driving the bidirectional breathing units to work according to the running state so as to manage the air flow state inside the battery pack. According to the battery pack management device, the state of the battery pack is monitored in real time through the multidimensional sensor, and the bidirectional breathing unit is regulated and controlled through the control unit, so that the active management of the air flow in the battery pack is realized, the thermal runaway of the battery pack is effectively restrained, the heat dissipation is optimized, the air pressure inside and outside the battery pack is balanced, and the use safety of the battery pack is remarkably improved.

Inventors

CAO JIANHANG
LIU GANG

Assignees

浙江吉利控股集团有限公司
浙江吉曜通行能源科技有限公司
湖州耀宁固态电池研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20251211

Claims (10)

1. The battery pack management method is characterized by being applied to a battery pack management device, wherein the battery pack management device comprises a control unit, a plurality of sensors connected with the control unit, at least two bidirectional breathing units arranged on a shell of the battery pack and connected with the control unit, and the method comprises the following steps of: acquiring multidimensional state information of the battery pack through the plurality of sensors; Judging the running state of the battery pack based on the multi-dimensional state information; And determining the working state of the bidirectional breathing unit according to the running state of the battery pack so as to manage the air flow state inside the battery pack.
2. The method of claim 1, wherein the multi-dimensional state information comprises at least two of a voltage value, a current value, a temperature value, and a barometric pressure value, and wherein determining the operational state of the battery pack based on the multi-dimensional state information comprises: if the change rate of the air pressure value is lower than the first air pressure change rate, and the voltage value and the current value are in the normal working range, judging that the battery pack is in a first running state; If the temperature value of the local area in the battery pack is rapidly increased and the temperature increasing rate exceeds the first temperature changing rate, and/or the impedance of the local area is changed, and/or the increasing rate of the air pressure value exceeds the second air pressure changing rate, wherein the second air pressure changing rate is larger than the first air pressure changing rate, and the battery pack is judged to be in a second running state; if the temperature values of a plurality of non-adjacent positions in the battery pack are increased simultaneously and exceed the second temperature change rate, and the increasing rate of the air pressure value exceeds the second air pressure change rate, judging that the battery pack is in a third running state; and if the air pressure value is suddenly changed and the control unit receives a collision signal, judging that the battery pack is in a fourth running state.
3. The method of claim 2, wherein when the battery pack is in the first operating state, the determining the operating state of the bi-directional breathing unit according to the operating state of the battery pack to manage the airflow state inside the battery pack comprises: Opening the bidirectional breathing unit; When the internal air pressure of the battery pack is lower than the external ambient air pressure, controlling the bidirectional breathing unit to execute air inlet operation; and when the internal air pressure of the battery pack is higher than the external ambient air pressure, controlling the bidirectional breathing unit to execute the exhausting operation.
4. The method of claim 2, wherein when the battery pack is in the second operating state, the determining the operating state of the bi-directional breathing unit according to the operating state of the battery pack to manage the airflow state inside the battery pack includes: determining the position of one or more target cells with abnormally elevated temperatures; Controlling at least one first bidirectional breathing unit close to the target battery cell to perform an exhaust operation; And controlling at least one second bidirectional breathing unit far away from the target battery cell to perform air inlet operation.
5. The method of claim 2, wherein when the battery pack is in the third operating state, the determining the operating state of the bi-directional breathing unit according to the operating state of the battery pack to manage the airflow state inside the battery pack includes: And controlling the bidirectional breathing unit to perform an exhaust operation.
6. The method of claim 2, wherein when the battery pack is in the fourth operating state, the determining the operating state of the bi-directional breathing unit according to the operating state of the battery pack to manage the airflow state inside the battery pack includes: and controlling the corresponding bidirectional breathing unit to execute air inlet or air outlet operation according to the change trend of the temperature value and/or the air pressure value until the temperature value and/or the air pressure is restored to the normal value.
7. The method according to any one of claims 3 to 6, wherein the bi-directional breathing unit includes a gas filtering unit for filtering a gas flow, a breathing valve for adjusting an open and closed state of an airway and an opening degree, and a ventilator for adjusting a direction and a flow rate of the gas flow, the method comprising: When the bidirectional breathing unit performs air inlet operation, controlling air flow to flow through the air filtering unit; when the bi-directional breathing unit performs an exhaust operation, the flow of gas is controlled to bypass the gas filtering unit.
8. The method of claim 1, wherein the battery pack management device further comprises a water-cooled conduit disposed at a bottom and/or a sidewall of the battery pack, the method further comprising: When the water cooling pipeline works, acquiring temperature distribution information inside the battery pack; When the external temperature of the battery pack is lower than the internal average temperature of the battery pack, controlling the bidirectional breathing unit to work according to the temperature distribution information so as to generate air flow flowing from a first area to a second area of the battery pack, wherein the temperature of the first area is higher than that of the second area, the first area and the second area are both positioned in the battery pack, and the first area is a position area with the temperature higher than that of the second area.
9. The method of claim 1, wherein the battery pack is provided with a plurality of sub-battery compartments separated from each other, the bi-directional breathing unit is disposed in a non-adjacent region of the plurality of sub-battery compartments, and wherein determining the operating state of the battery pack based on the multi-dimensional state information comprises: Determining a sub-battery compartment for thermal runaway based on the multi-dimensional state information; And controlling the bi-directional breathing units corresponding to the sub-battery bins to execute exhaust operation.
10. A battery pack management apparatus, comprising: a control unit; the sensors are connected with the control unit and are used for collecting multidimensional state information of the battery pack; The two-way breathing units are arranged on the shell of the battery pack and are connected with the control unit; the control unit is configured to judge the running state of the battery pack based on the multi-dimensional state information and generate a control instruction for driving the bidirectional breathing unit to work according to the running state so as to manage the air flow state inside the battery pack.

Description

Battery pack management device and method Technical Field The present invention relates to the field of battery technologies, and in particular, to a device and a method for managing a battery pack. Background Thermal runaway of the battery pack generally causes heat accumulation due to exothermic side reactions inside the battery cells, the rate of the battery cell-to-outside heat exchange is smaller than the heat accumulation rate, and the temperature of the battery pack continuously increases until reaching the ignition temperature, causing the battery pack to burn or explode. In order to prevent the occurrence of thermal runaway accidents of the battery pack, avoid unbalance of internal and external pressures of the battery pack, generate a large amount of toxic gas when the battery pack fires, and timely pressure release and gas discharge are needed. In the prior art, an explosion-proof valve and an exhaust valve are generally adopted to control the internal pressure of a battery pack body, when the battery pack has faults such as thermal runaway and the like, the internal pressure of the battery pack is increased sharply, and the explosion-proof valve is opened to discharge internal gas for pressure relief. However, the explosion-proof valve is usually passively started, and can be exhausted only after being pushed up by pressure, so that the valve opening pressure is high, and the whole inclusion structure is required to have high pressure resistance. In addition, the randomness of the open position of the battery pack is strong, and the thermal diffusion is not caused in the content of the battery pack easily. When the battery pack is in normal operation, the pressure inside the battery pack also changes, but the explosion-proof valve cannot be opened for pressure adjustment due to the fact that the pressure changes little. Disclosure of Invention In view of the above, the present invention is directed to a battery pack management device and a battery pack management method, which can actively manage the airflow inside the battery pack, thereby effectively inhibiting the thermal runaway of the battery pack, optimizing heat dissipation, balancing the air pressure inside and outside the battery pack, and significantly improving the use safety of the battery pack. The invention provides a battery pack management device, comprising: a control unit; the sensors are connected with the control unit and are used for collecting multidimensional state information of the battery pack; The two-way breathing units are arranged on the shell of the battery pack and are connected with the control unit; the control unit is configured to judge the running state of the battery pack based on the multi-dimensional state information and generate a control instruction for driving the bidirectional breathing unit to work according to the running state so as to manage the air flow state inside the battery pack. The invention also provides a battery pack management method which is applied to the battery pack management device, wherein the battery pack management device comprises a control unit, a plurality of sensors connected with the control unit, at least two bidirectional breathing units arranged on a shell of the battery pack and connected with the control unit, and the method comprises the following steps of: acquiring multidimensional state information of the battery pack through the plurality of sensors; Judging the running state of the battery pack based on the multi-dimensional state information; And determining the working state of the bidirectional breathing unit according to the running state of the battery pack so as to manage the air flow state inside the battery pack. In one embodiment, the multi-dimensional state information includes at least two of a voltage value, a current value, a temperature value, and an air pressure value, and the determining the operation state of the battery pack based on the multi-dimensional state information includes: if the change rate of the air pressure value is lower than the first air pressure change rate, and the voltage value and the current value are in the normal working range, judging that the battery pack is in a first running state; If the temperature value of the local area in the battery pack is rapidly increased and the temperature increasing rate exceeds the first temperature changing rate, and/or the impedance of the local area is changed, and/or the increasing rate of the air pressure value exceeds the second air pressure changing rate, wherein the second air pressure changing rate is larger than the first air pressure changing rate, and the battery pack is judged to be in a second running state; if the temperature values of a plurality of non-adjacent positions in the battery pack are increased simultaneously and exceed the second temperature change rate, and the increasing rate of the air pressure value exceeds the second air pressure change rate, judging that