Detection and positioning method, system and equipment suitable for thermal runaway of battery pack in battery cluster and medium

Abstract

The invention belongs to the technical field of battery cluster thermal runaway detection, and particularly relates to a detection positioning method, system and device suitable for thermal runaway of a battery pack in a battery cluster and a medium. The method comprises the following steps: grouping channels such as battery packs, battery cabins and electrical cabins in a battery cluster in a manner of combining grouping detection and dichotomy positioning, and sequentially carrying out thermal runaway detection; and when a thermal runaway early warning or alarm occurs in a certain channel group, a thermal runaway channel is quickly positioned by adopting a bisection method. According to the method, an air suction type thermal runaway detection technology is utilized, gas in the battery pack is extracted for analysis, and thermal runaway detection of the battery pack is achieved. The application of the dichotomy search algorithm further improves the accuracy of thermal runaway channel positioning. Compared with a traditional detection method, the method has the advantages of being short in detection period, accurate in positioning, low in cost and the like, is suitable for battery pack thermal runaway detection scenes such as electrochemical energy storage and the like, and has high application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery pack thermal runaway detection, and specifically relates to a detection and positioning method, system, equipment and medium suitable for thermal runaway of a battery pack in a battery cluster. Background Art

[0002] In existing products, thermal runaway detection of battery clusters is usually divided into two methods: One method is to place a detector in each battery pack. Although this method can achieve independent detection of each battery pack, the cost of the detector is relatively high, resulting in an increase in the overall cost.

[0003] Another way is to extract and analyze the gas in the battery pack for detection. This method only uses one set of sensors, so the cost advantage is obvious. However, when this air intake method is used to detect thermal runaway of the battery pack, each battery pack is usually inspected in rotation. Due to factors such as the distance of the air intake duct and the diameter of the duct, the thermal runaway detection time of a single channel is relatively long, usually around 20 seconds (10 seconds for analysis and 10 seconds for exhaust). Taking a typical battery cluster containing 8 battery packs, 1 battery compartment, and 1 electrical compartment as an example, the detection cycle of the battery cluster will reach 200 seconds.

[0004] However, the above method has the following problems: 1. Long detection cycle: Since each battery pack needs to be inspected in rotation and the single-channel detection time is long, the detection cycle of the entire battery cluster is long and cannot meet the needs of rapid detection.

[0005] 2. Low detection efficiency: In a battery cluster, if only one or a few battery packs experience thermal runaway, the traditional method still requires rotation detection of all battery packs, resulting in low detection efficiency.

[0006] 3. Impact on battery pack and system life: Frequent rotation detection may have a certain impact on the life of the battery pack and battery management system (BMS). Especially after long-term use, the consistency of the batteries in the battery pack will further decrease, and the detection mechanism will be easily triggered frequently, further aggravating the loss of the battery pack and BMS system. Summary of the invention

[0007] The purpose of the present invention is to provide a detection and positioning method, system, equipment and medium suitable for thermal runaway of battery packs within a battery cluster, aiming to solve the problem of long thermal runaway detection time in the prior art. By adopting channel group analysis and binary search methods, rapid detection and positioning of thermal runaway of channels such as battery packs, battery compartments, and electrical compartments within a battery cluster is achieved.

[0008] The present invention achieves the above-mentioned purpose through the following technical solutions: In a first aspect, the present invention proposes a method for detecting and locating thermal runaway of a battery pack in a battery cluster, the method comprising: The battery packs, battery compartments and electrical compartments in the battery cluster are grouped to form a plurality of channel groups, each of which includes a plurality of channels and channel numbers for connecting the battery cluster, the battery compartment, the electrical compartment and the thermal runaway detection unit; Traversing each channel group according to the ascending order of the channel numbers and a preset detection strategy, performing a thermal runaway detection operation, and obtaining thermal runaway response information of each channel group; Determine a thermal runaway channel group to be located that has a thermal runaway risk according to the thermal runaway response information; Dividing the to-be-located thermal runaway channel group into at least two channel subsets by using a binary method, and performing a thermal runaway detection operation on the channel subsets based on the detection strategy; Whether thermal runaway exists in a certain channel subset is determined based on the thermal runaway response information of the channels in each channel subset within the set time. If so, the binary division and detection steps are repeated for the channel subset until the specific thermal runaway channel is located.

[0009] Furthermore, the detection strategy is implemented based on the thermal runaway detection unit, specifically, extracting gas from the battery pack and guiding the extracted gas to a detection terminal pre-arranged in the thermal runaway detection unit, and obtaining thermal runaway response information according to a detection program preset in the detection terminal; The testing procedure includes: Initialization step: used to set detection parameters and start the detection process; Gas analysis step: Analyze the extracted gas to detect whether there is thermal runaway characteristic gas; Response judgment step: judging whether there is a thermal runaway risk according to the gas analysis result, and generating corresponding thermal runaway response information, wherein the thermal runaway response information includes thermal runaway warning / alarm information.

[0010] Furthermore, the thermal runaway detection operation includes: Control all channels in the current channel group or channel subset to form a path, and perform thermal runaway detection on the gas in the channel group or channel subset; When no thermal runaway warning or alarm occurs, the path in this channel group or channel subset is closed, and then the channels of the next channel group or channel subset are controlled to form a path for thermal runaway detection.

[0011] Furthermore, the binary division and detection steps are specifically as follows: Based on dividing the thermal runaway channel group to be located into at least two channel subsets, the channel subsets include channels and their numbers, after closing a part of the channels in the channel subsets, thermal runaway detection is performed on the remaining channels; According to the detection results, determine whether the channel of thermal runaway is in the closed channel or in the unclosed channel; Repeat the above steps until the channel with thermal runaway is identified.

[0012] In a second aspect, the present invention proposes a detection and positioning system for thermal runaway of a battery pack in a battery cluster, which is applied to execute any of the detection and positioning methods described above, and the system comprises: The channel grouping module is used to group the battery packs, battery compartments and electrical compartments in the battery cluster to form multiple channel groups and assign a unique channel number to each channel; A thermal runaway detection unit, used to traverse each channel group in order according to the ascending order of the channel number and a preset detection strategy, perform a thermal runaway detection operation, and obtain thermal runaway response information of each channel group; The binary positioning module is used to determine the thermal runaway channel group to be located with thermal runaway risk based on the thermal runaway response information, and divide the thermal runaway channel group to be located into at least two channel subsets using a binary strategy, and perform thermal runaway detection operations on the channel subsets until a specific thermal runaway channel is located.

[0013] Furthermore, the thermal runaway detection unit also includes a gas extraction device and a detection end, the gas extraction device is used to extract the gas in the battery pack and guide the extracted gas to the detection end; the detection end is preset with a detection program, which is used to determine whether there is a thermal runaway risk based on the gas analysis results and generate corresponding thermal runaway response information.

[0014] Furthermore, the detection procedure includes an initialization step, a gas analysis step and a response judgment step, wherein the response judgment step refers to historical detection data and a thermal runaway characteristic gas database to judge the thermal runaway risk.

[0015] In a third aspect, the present invention provides an electronic device, comprising: A processor; and a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the detection and positioning method as described in any one of the above items.

[0016] In a fourth aspect, the present invention proposes a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the detection and positioning method as described in any one of the above items.

[0017] The beneficial effects of the present invention are: The present invention significantly improves the detection efficiency of thermal runaway of battery packs in a battery cluster with an air intake method by combining group detection with binary positioning. Traditional detection methods require each battery pack to be detected one by one, which has a long detection cycle and is limited by factors such as the distance of the air intake duct and the diameter of the duct. The detection time of a single-channel thermal runaway is relatively long. The present invention divides the channels of the battery cluster into several groups, first performs a thermal runaway analysis of the channel group, and then uses binary positioning to quickly locate the thermal runaway channel when a thermal runaway warning or alarm occurs, which greatly shortens the detection cycle and improves the safety and reliability of the battery cluster.

[0018] The present invention reduces the detection cost by optimizing the thermal runaway detection process. The traditional detection method of placing a detector in each battery pack is costly, while the present invention only uses one set of detection ends to extract and analyze the gas in the battery pack through the air intake duct, thereby realizing the detection of thermal runaway of the battery pack in the battery cluster. At the same time, the group detection and binary positioning method adopted by the present invention, while ensuring the detection efficiency, also further reduces the detection cost and improves the economy of the battery cluster. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a flow chart of a method for detecting and locating thermal runaway of a battery cluster according to an embodiment of the present application; Figure 2 A schematic diagram of a structure of a battery cluster thermal runaway detection air intake method in an embodiment of the present application; Figure 3 A schematic diagram of a flow chart of channel group analysis provided in an embodiment of the present application; Figure 4 A schematic diagram of a process for locating a thermal runaway channel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1

[0022] like Figure 1-4 As shown, this embodiment proposes a detection and positioning method for thermal runaway of a battery pack in a battery cluster. The method is based on the extraction and analysis of the battery pack for detection. The method includes the following steps: S1. Grouping battery packs, battery compartments and electrical compartments in a battery cluster to form multiple channel groups, each channel group including a number of battery packs, battery compartments, electrical compartments and a number of channels and channel numbers of a thermal runaway detection unit; S2. Traverse each channel group according to the ascending order of the channel number and the preset detection strategy, perform a thermal runaway detection operation, and obtain thermal runaway response information of each channel group; S3. Determine a group of thermal runaway channels to be located that have a risk of thermal runaway according to the thermal runaway response information; S4, dividing the thermal runaway channel group to be located into at least two channel subsets by using a binary method, and performing a thermal runaway detection operation on the channel subsets based on the detection strategy; S5. Determine whether thermal runaway exists in a certain channel subset according to the thermal runaway response information of the channels in each channel subset within a set time. If so, repeat the binary division and detection steps for the channel subset until a specific thermal runaway channel is located.

[0023] In the above method, the meanings of some technical features are as follows: Battery cluster: consists of multiple battery packs, electrical compartments, and battery compartments.

[0024] Battery pack: consists of BMS and series-parallel cells.

[0025] Electrical warehouse: PCS and other electrical equipment.

[0026] Battery compartment: storage space for the battery pack.

[0027] It should be noted that the channels in this embodiment correspond to the air intake ducts of the battery pack, battery compartment, and electrical compartment, and the channel group is a thermal runaway detection unit composed of several channels.

[0028] Further preferably, the detection strategy is implemented based on the thermal runaway detection unit, specifically extracting the gas in the battery pack and guiding the extracted gas to the detection end pre-arranged in the thermal runaway detection unit, and obtaining thermal runaway response information according to the detection program preset by the detection end; wherein the thermal runaway response information is specifically: Thermal runaway warning: primary thermal runaway state of the battery pack. Thermal runaway alarm: severe thermal runaway state of the battery pack.

[0029] The testing procedure includes: Initialization step: used to set detection parameters and start the detection process; Gas analysis step: Analyze the extracted gas to detect whether there is thermal runaway characteristic gas; Response judgment step: judging whether there is a thermal runaway risk according to the gas analysis result, and generating corresponding thermal runaway response information, wherein the thermal runaway response information includes thermal runaway warning / alarm information.

[0030] Further preferably, the thermal runaway detection operation includes: Control all channels in the current channel group or channel subset to form a path, and perform thermal runaway detection on the gas in the channel group or channel subset; When no thermal runaway warning or alarm occurs, the path in this channel group or channel subset is closed, and then the channels of the next channel group or channel subset are controlled to form a path for thermal runaway detection.

[0031] Further preferably, the binary division and detection steps are specifically as follows: Based on dividing the thermal runaway channel group to be located into at least two channel subsets, the channel subsets include channels and their numbers, after closing a part of the channels in the channel subsets, thermal runaway detection is performed on the remaining channels; According to the detection results, determine whether the channel of thermal runaway is in the closed channel or in the unclosed channel; Repeat the above steps until the channel with thermal runaway is identified.

[0032] In some optional embodiments, the battery cluster thermal runaway detection air intake structure is as follows: Figure 2 As shown, the thermal runaway detection unit in this embodiment is the thermal runaway detection device in the figure, and the detection end is a detector and an air intake device, forming an air intake channel connecting the air intake device and each battery pack, and each air intake channel is provided with a channel valve. During specific implementation, the channel valve is enabled, and the air intake device absorbs the gas in the battery pack to the position where the detector is located through a pipe connected to the battery pack. The detector analyzes the gas in the battery pack sucked in, specifically based on the above-mentioned detection and positioning method proposed in this embodiment, thereby performing thermal runaway detection on the battery pack, and through different channel valve selection controls, the above-mentioned detection strategies and thermal runaway detection operations, thermal runaway detection of battery packs in different channels can be achieved.

[0033] Based on the same inventive concept, this embodiment further proposes a detection and positioning system for thermal runaway of a battery pack in a battery cluster, which is used to perform the above-mentioned detection and positioning method. The system includes: The channel grouping module is used to group the battery packs, battery compartments and electrical compartments in the battery cluster to form multiple channel groups and assign a unique channel number to each channel; A thermal runaway detection unit, used to traverse each channel group in order according to the ascending order of the channel number and a preset detection strategy, perform a thermal runaway detection operation, and obtain thermal runaway response information of each channel group; The binary positioning module is used to determine the thermal runaway channel group to be located with thermal runaway risk based on the thermal runaway response information, and divide the thermal runaway channel group to be located into at least two channel subsets using a binary strategy, and perform thermal runaway detection operations on the channel subsets until a specific thermal runaway channel is located.

[0034] Further preferably, the thermal runaway detection unit also includes a gas extraction device and a detection end, the gas extraction device is used to extract the gas in the battery pack and guide the extracted gas to the detection end; the detection end is preset with a detection program, which is used to determine whether there is a thermal runaway risk based on the gas analysis results and generate corresponding thermal runaway response information.

[0035] Further preferably, the detection procedure includes an initialization step, a gas analysis step and a response judgment step, wherein the response judgment step refers to historical detection data and a thermal runaway characteristic gas database to judge the thermal runaway risk.

[0036] Combination Figure 3 and Figure 4 According to the above embodiments of the present invention, the thermal runaway detection of channels such as battery packs, battery compartments, and electrical compartments in a battery cluster is generally divided into two processes: channel group thermal runaway analysis and thermal runaway channel positioning.

[0037] Channel Group Thermal Runaway Analysis: Taking the battery cluster scenario of 10 channels with 8 battery packs, battery compartment and electrical compartment as an example, it can be divided into three channel groups through the channel grouping module. The first group is battery packs 1-4, the second group is battery packs 5-8, and the third group is battery compartment and electrical compartment. During detection, based on the thermal runaway detection unit, first open all channel collection valves in channel group 1 to perform thermal runaway detection on the gas in the channel group. If no thermal runaway warning / alarm occurs, close all channel valves of this channel group, and then open all channel valves of the next channel group for thermal runaway detection, and so on. When performing thermal runaway detection on a channel group, if a thermal runaway warning / alarm is detected, enter the thermal runaway channel locating step.

[0038] Thermal runaway channel positioning: Based on the binary positioning module, the channel group positioning uses a binary search method to locate the thermal runaway channel. Taking the thermal runaway warning / alarm in the first channel group as an example, the current channel group has 4 channels. After closing channels 1 and 2, perform thermal runaway detection on channels 3 and 4. If the thermal runaway warning / alarm still exists within the detection time, it means that the thermal runaway channel is in channels 3 and 4 that have not been closed. Then close channel 3 and continue to detect the thermal runaway status. If the thermal runaway alarm / warning still exists, it means that the thermal runaway channel is channel 4; otherwise, it is channel 3.

[0039] In specific implementation, the detection and positioning method and system of the present invention have high feasibility in practical applications. First, through the group detection method, the detection cycle of the entire battery cluster can be greatly shortened and the detection efficiency can be improved. Secondly, the binary search method is used to locate the thermal runaway channel, which can further shorten the positioning time and improve the accuracy of positioning. In addition, the detection method of the present invention does not require additional hardware equipment, and can be implemented by simply upgrading the software of the existing air-breathing detection system, so it has high economy and practicality.

[0040] In another embodiment of the present invention, an electronic device is provided, including: A processor; and a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the detection and positioning method as described above.

[0041] In another embodiment of the present invention, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the detection and positioning method as described above.

[0042] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0043] In addition, each functional module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting and locating thermal runaway of a battery pack in a battery cluster, characterized in that: The method comprises: The battery packs, battery compartments and electrical compartments in the battery cluster are grouped to form multiple channel groups, each of which includes several channels and channel numbers of the thermal runaway detection units of the battery packs, battery compartments and electrical compartments; Traversing each channel group according to the ascending order of the channel numbers and a preset detection strategy, performing a thermal runaway detection operation, and obtaining thermal runaway response information of each channel group; Determine a thermal runaway channel group to be located that has a thermal runaway risk according to the thermal runaway response information; Dividing the to-be-located thermal runaway channel group into at least two channel subsets by using a binary method, and performing a thermal runaway detection operation on the channel subsets based on the detection strategy; Whether thermal runaway exists in a certain channel subset is determined based on the thermal runaway response information of the channels in each channel subset within the set time. If so, the binary division and detection steps are repeated for the channel subset until the specific thermal runaway channel is located.

2. A method for detecting and locating thermal runaway of a battery pack in a battery cluster according to claim 1, characterized in that: The detection strategy is implemented based on the thermal runaway detection unit, specifically, extracting gas from the battery pack and guiding the extracted gas to a detection terminal pre-arranged in the thermal runaway detection unit, and obtaining thermal runaway response information according to a detection program preset in the detection terminal; The testing procedure includes: Initialization step: used to set detection parameters and start the detection process; Gas analysis step: Analyze the extracted gas to detect whether there is thermal runaway characteristic gas; Response judgment step: judging whether there is a thermal runaway risk according to the gas analysis result, and generating corresponding thermal runaway response information, wherein the thermal runaway response information includes thermal runaway warning / alarm information.

3. The method for detecting and locating thermal runaway of a battery pack in a battery cluster according to claim 1, characterized in that: The thermal runaway detection operation includes: Control all channels in the current channel group or channel subset to form a path, and perform thermal runaway detection on the gas in the channel group or channel subset; When no thermal runaway warning or alarm occurs, the path in this channel group or channel subset is closed, and then the channels of the next channel group or channel subset are controlled to form a path for thermal runaway detection.

4. The method for detecting and locating thermal runaway of a battery pack in a battery cluster according to claim 1, characterized in that: The binary division and detection steps are specifically as follows: Based on dividing the thermal runaway channel group to be located into at least two channel subsets, the channel subsets include channels and their numbers, after closing a part of the channels in the channel subsets, thermal runaway detection is performed on the remaining channels; According to the detection results, determine whether the channel of thermal runaway is in the closed channel or in the unclosed channel; Repeat the above steps until the channel with thermal runaway is identified.

5. A detection and positioning system for thermal runaway of a battery pack in a battery cluster, used to execute the detection and positioning method according to any one of claims 1 to 4, characterized in that: The system comprises: The channel grouping module is used to group the battery packs, battery compartments and electrical compartments in the battery cluster to form multiple channel groups and assign a unique channel number to each channel; A thermal runaway detection unit, used to traverse each channel group in order according to the ascending order of the channel number and a preset detection strategy, perform a thermal runaway detection operation, and obtain thermal runaway response information of each channel group; The binary positioning module is used to determine the thermal runaway channel group to be located with thermal runaway risk based on the thermal runaway response information, and divide the thermal runaway channel group to be located into at least two channel subsets using a binary strategy, and perform thermal runaway detection operations on the channel subsets until a specific thermal runaway channel is located.

6. A detection and positioning system for thermal runaway of battery packs in a battery cluster according to claim 5, characterized in that: The thermal runaway detection unit also includes a gas extraction device and a detection end. The gas extraction device is used to extract the gas in the battery pack and guide the extracted gas to the detection end; the detection end is preset with a detection program for determining whether there is a thermal runaway risk based on the gas analysis results and generating corresponding thermal runaway response information.

7. A detection and positioning system for thermal runaway of battery packs in a battery cluster according to claim 6, characterized in that: The detection procedure includes an initialization step, a gas analysis step and a response judgment step, wherein the response judgment step refers to historical detection data and a thermal runaway characteristic gas database to judge the thermal runaway risk.

8. An electronic device, characterized in that: include: processor; and a memory for storing instructions executable by said processor; The processor is configured to execute the instructions to implement the detection and positioning method according to any one of claims 1 to 4.

9. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the detection and positioning method as claimed in any one of claims 1 to 4.

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