Thermal diffusion testing method and device

Abstract

The embodiment of the invention provides a thermal diffusion testing method and device. The accuracy of thermal diffusion testing of an energy storage device can be improved. The method comprises the following steps: executing an abnormal triggering operation for a target battery device in the energy storage device; collecting target gas from the interior of the energy storage device, wherein the target gas is gas generated after the target battery device is abnormal; and performing a thermal diffusion test on the energy storage device according to the target gas.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a method and device for thermal diffusion testing. Background Art

[0002] With the promotion and application of new energy, energy storage technology has also developed. Energy storage devices may experience abnormalities during use, such as thermal runaway, which will not only damage the energy storage device itself, but also cause thermal radiation to surrounding energy storage devices and other objects.

[0003] In order to determine the possible situations that may occur when heat diffusion occurs in the energy storage device and the impact on the surrounding area, thermal diffusion testing of the energy storage device is an important means during the design, manufacturing and operation of the energy storage device. Summary of the invention

[0004] The embodiments of the present application provide a method and device for thermal diffusion testing, which can improve the accuracy of thermal diffusion testing of energy storage devices.

[0005] In a first aspect, a method for thermal diffusion testing is provided, the method comprising: performing an abnormality triggering operation on a target battery device in an energy storage device; collecting a target gas from inside the energy storage device, the target gas being a gas generated after an abnormality occurs in the target battery device; and performing a thermal diffusion test on the energy storage device based on the target gas.

[0006] In the embodiment of the present application, after performing an abnormal triggering operation on a target battery device in an energy storage device, target gas is collected from inside the energy storage device, so that the collected gas is almost all gas generated after performing the abnormal triggering operation, and the possibility of being mixed with other gases (such as air) is extremely low, which can effectively improve the accuracy of the collected gas, and then the collected gas can be used to better perform a thermal diffusion test on the energy storage device to improve the accuracy of the thermal diffusion test.

[0007] In some possible implementations, collecting the target gas from inside the energy storage device includes: collecting the target gas from inside the energy storage device through a through hole provided on the energy storage device, wherein the through hole is provided on the top wall of the energy storage device and / or the first wall of the energy storage device.

[0008] In this technical solution, since the gas usually diffuses from bottom to top, the through hole is arranged on the top wall of the energy storage device, which is conducive to collecting the target gas. In addition, the through hole is arranged on the first wall of the energy storage device, which further facilitates the collection of the target gas.

[0009] In some possible implementations, collecting the target gas from inside the energy storage device through a through hole provided on the energy storage device includes: collecting the target gas from inside the energy storage device using an intake pipe extending into the energy storage device through the through hole.

[0010] In this technical solution, the air intake pipe extends into the interior of the energy storage device through the through hole. This is easy to implement on the one hand, and on the other hand, the target gas collected by the air intake pipe is almost all the gas generated after performing an abnormal triggering operation, further reducing the possibility of the collected target gas being mixed with other gases.

[0011] In some possible implementations, the through hole is arranged at a first position of the top wall, and along the length direction, the first position is the same as the position of the target battery device, and along the width direction, the first position is the same as the position of the target battery device; and / or the through hole is arranged at a second position of the first wall, and along the length direction, the second position is the same as the position of the target battery device, and along the height direction, the second position is the same as the position of the target battery device.

[0012] In this technical solution, when the through hole is set on the top wall, the through hole is at the same position as the target battery device along the length direction, and along the width direction, the through hole is at the same position as the target battery device; when the through hole is set on the first wall, the through hole is at the same position as the target battery device along the length direction, and along the height direction, the through hole is at the same position as the target battery device, that is, the position of the through hole on the energy storage device corresponds to the position of the target battery device. This setting method allows the target gas to be collected more quickly. In addition, since the target battery device may produce more target gas, the total amount of target gas collected is also greater, which is conducive to a series of subsequent operations based on the target gas.

[0013] In some possible implementations, collecting the target gas from inside the energy storage device includes: collecting the target gas from inside the energy storage device through multiple branches, the multiple branches including a first branch and a second branch; the method also includes: real-time analysis of the target gas collected through the first branch, and collection of the target gas collected through the second branch.

[0014] The above technical solution collects target gas through multiple branches. In this way, after collecting the target gas, not only can the target gas be analyzed in real time, but the target gas can also be collected while analyzing the target gas, so that all gas components included in the target gas can be analyzed later through the collected target gas. The data obtained by this analysis is more accurate and can better provide important references for the energy storage system, such as performing thermal diffusion tests on energy storage devices based on target gases, thereby improving the accuracy of thermal diffusion tests on energy storage devices.

[0015] In some possible implementations, performing an abnormal trigger operation on a target battery device in an energy storage device includes: triggering thermal runaway of the target battery device; the method further includes: igniting at a target position inside the energy storage device, wherein the target position is within a preset range centered on the target battery device.

[0016] Because within a few hours after triggering the thermal runaway of the energy storage device, the energy storage device may only smoke and not burn. Therefore, after triggering the thermal runaway of the target battery device, this technical solution ignites inside the energy storage device. On the one hand, it allows the energy storage device to burn, and then the fire situation when the energy storage device burns and the impact on the surroundings can be obtained, which provides further reference for the thermal diffusion test of the energy storage device; on the other hand, it can control the burning time of the energy storage device, which is convenient for controlling the energy storage device. Furthermore, since the gas concentration near the target battery device is relatively high, ignition near the target battery device makes the energy storage device more likely to burn.

[0017] In some possible implementations, the igniting at a target position inside the energy storage device includes: detecting a combustible gas inside the energy storage device; and igniting at the target position when the combustible gas is detected.

[0018] Since combustible gas will usually explode at the moment of ignition, igniting the combustible gas after it appears inside the energy storage device can test whether the energy storage device will explode, thereby better performing thermal diffusion tests on the energy storage device.

[0019] In some possible implementations, the method further includes: collecting a target pressure inside the energy storage device.

[0020] The above technical solution, by collecting the target pressure inside the energy storage device, facilitates the subsequent simulation using the pressure data, thereby further providing simulation data support for the thermal diffusion test of the energy storage device.

[0021] In some possible implementations, collecting the target pressure inside the energy storage device includes: collecting the target pressure through a pressure sensor, wherein the pressure sensor is arranged at at least one of the following positions inside the energy storage device: a target position, a center position of the energy storage device, at least one corner of the top wall of the energy storage device, and at least one corner of the bottom wall of the energy storage device, wherein the target position is located within a preset range centered on the target battery device.

[0022] In the above technical solution, the pressure sensor is arranged at at least one of the following positions inside the energy storage device: the target position, the center position of the energy storage device, at least one corner of the top wall of the energy storage device, and at least one corner of the bottom wall of the energy storage device. In this way, the target pressure inside the energy storage device can be collected more comprehensively and accurately, so that the accuracy of subsequent operations based on the target pressure is higher.

[0023] In some possible implementations, performing an abnormality triggering operation on a target battery device in the energy storage device includes: performing an abnormality triggering operation on at least some battery cells located in a middle position of the target battery device.

[0024] In general, when heat diffusion occurs in a battery device, the heat diffuses from the inside to the outside. Therefore, the above technical solution selects at least part of the battery cells in the center of the target battery device for triggering, so that after the abnormal triggering operation is performed on these battery cells, the heat diffuses from the middle to the outside, which is more in line with the actual situation.

[0025] In some possible implementations, performing an abnormal triggering operation on a target battery device in an energy storage device includes: providing a heating device at an end of the target battery device; and triggering the heating device to perform the abnormal triggering operation.

[0026] This technical solution, by arranging a heating device at the end of the target battery device to make the target battery device abnormal, does not need to arrange a heating device inside the target energy storage device in advance, is relatively simple to operate, and has high efficiency.

[0027] In some possible implementations, the target battery device is located at the center of the energy storage device, so that after an abnormality occurs in the target battery device, the abnormality can be better spread to the surrounding area, thereby causing the entire energy storage device to become abnormal.

[0028] In some possible implementations, the target battery device is located at the center of the energy storage device and close to a bottom wall of the energy storage device.

[0029] Since heat usually diffuses upward, the above technical solution sets the target battery device in the center of the energy storage device and close to the bottom wall of the energy storage device. After performing the abnormal triggering operation on the target battery device, the heat can be further spread to the surrounding area, thereby causing the entire energy storage device to become abnormal in a shorter time.

[0030] In some possible implementations, collecting the target gas from inside the energy storage device includes: collecting the target gas from inside the energy storage device when an abnormality occurs in the target battery device.

[0031] This technical solution collects the target gas from inside the energy storage device after an abnormality occurs in the target battery device, which can further increase the application scenarios of the embodiments of the present application, such as application in scenarios where thermal runaway or even fire occurs in the target battery device.

[0032] In a second aspect, a device for thermal diffusion testing is provided, comprising: a trigger unit for performing an abnormal trigger operation on a target battery device in an energy storage device; a collection unit for collecting a target gas from inside the energy storage device, wherein the target gas is a gas generated after an abnormality occurs in the target battery device; and a test unit for performing a thermal diffusion test on the energy storage device based on the target gas.

[0033] In a third aspect, a device for thermal diffusion testing is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call the computer program to execute the method in the first aspect or its various implementations.

[0034] In a fourth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in the above-mentioned first aspect or its various implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an energy storage device according to an embodiment of the present application is shown.

[0036] Figure 2 A schematic flow chart of a method for thermal diffusion testing according to an embodiment of the present application is shown.

[0037] Figure 3 A schematic diagram showing the position of a target battery device in an energy storage device according to an embodiment of the present application is shown.

[0038] Figure 4 A schematic diagram showing a heating device disposed at both ends of a target battery device according to an embodiment of the present application is shown.

[0039] Figure 5A schematic diagram showing the position of a through hole on an energy storage device according to an embodiment of the present application is shown.

[0040] Figure 6 A schematic diagram of gas collection according to an embodiment of the present application is shown.

[0041] Figure 7 A schematic diagram of ignition at a target position of an energy storage device according to an embodiment of the present application is shown.

[0042] Figure 8 A schematic diagram showing the setting position of another pressure sensor according to an embodiment of the present application is shown.

[0043] Fig. 9 A schematic block diagram of a device for thermal diffusion testing according to an embodiment of the present application is shown.

[0044] Fig.10 A schematic block diagram of another device for thermal diffusion testing according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0047] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0049] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0050] With the promotion and application of new energy, energy storage technology has developed accordingly. An energy storage system is a device or system that can store energy and release it when needed. In the field of new energy, an energy storage system usually refers to a device that can store electrical energy and release it during peak hours of electricity consumption. Energy storage systems play a variety of roles in power systems, including load balancing, frequency regulation, backup power, peak and valley electricity price management, and improving grid stability. With the rapid development of renewable energy, the importance of energy storage systems is increasing.

[0051] Electrochemical energy storage, represented by lithium-ion batteries, is the energy storage technology with the highest proportion. Electrochemical energy storage systems usually include multiple energy storage devices, which are equipped with a large number of batteries and other electrical equipment. These devices may generate heat during long-term operation. If the heat cannot be effectively dissipated, it may cause abnormalities in the energy storage device or the entire energy storage system, such as thermal runaway, combustion, explosion and other serious consequences. The energy storage device may be a large device. Once combustion and explosion occur, it will cause huge economic losses and casualties. In order to determine the possible situations that may occur in the energy storage device and the impact on the surrounding area, thermal diffusion testing of the energy storage device is an important means during the design, manufacture and operation of the energy storage device.

[0052] In addition, with the continuous development of energy storage technology and the expansion of its application scope, countries have formulated corresponding standards and regulations to regulate the design and use of energy storage systems. These standards and regulations usually require energy storage systems to undergo thermal diffusion tests to verify whether they meet safety requirements.

[0053] Furthermore, energy storage devices require regular maintenance and upkeep during operation. Through thermal diffusion testing, data on energy storage devices under abnormal conditions can be obtained, which can provide important references for the operation and maintenance of energy storage systems. For example, targeted maintenance and upkeep plans can be developed based on the test results to promptly identify and address potential safety hazards.

[0054] When conducting a thermal diffusion test, the gas generated by the energy storage device after an abnormality occurs can be collected to provide an important reference for the energy storage system. For example, if the energy storage device burns after an abnormality occurs, whether these gases will pollute the atmospheric environment and whether they will cause harm to the health of rescuers and surrounding residents. Usually, the gas generated by the energy storage device is collected by an exhaust hood (or other names such as a collection hood) set on the top of the energy storage device. However, this collection method will collect air into the exhaust hood while collecting the gas generated by the energy storage device, so that the collected gas cannot well reflect the degree of impact on the atmospheric environment, rescuers and surrounding residents.

[0055] In view of this, the present application provides a method for thermal diffusion testing, which first performs an abnormal trigger operation on a target battery device in an energy storage device, then collects a target gas from inside the energy storage device, the target gas being the gas generated after an abnormality occurs in the target battery device, and then performs a thermal diffusion test on the energy storage device based on the target gas. This solution collects the target gas from inside the energy storage device, so that the collected gas is almost all gas generated after an abnormality occurs, and the possibility of being mixed with other gases (such as air) is extremely low, and then the collected gas can better perform a thermal diffusion test on the energy storage device to improve the accuracy of the thermal diffusion test.

[0056] The technical solution of the embodiment of the present application can be applied to an energy storage system, which includes an energy storage device. The energy storage device can be an energy storage device of various types and sizes. For example, the energy storage device can be Figure 1 The energy storage container shown may also be an energy storage cabinet. The energy storage device may be, for example, a regular rectangular parallelepiped structure, wherein the six faces of the rectangular parallelepiped are the six outer walls of the energy storage device. The energy storage device is arranged as a rectangular parallelepiped structure, which can facilitate the fixed placement and transportation of the energy storage device. Of course, the energy storage device may also be in other shapes, for example, at least one wall of the energy storage device is arranged obliquely.

[0057] Figure 2 A schematic flow chart of a method 200 for thermal diffusion testing according to an embodiment of the present application is shown. The method 200 may include at least part of the following contents.

[0058] S210: Execute an abnormality triggering operation for a target battery device in the energy storage device.

[0059] S220: Collecting target gas from inside the energy storage device, where the target gas is gas generated when an abnormality occurs in the target battery device.

[0060] S230: Perform a thermal diffusion test on the energy storage device according to the target gas.

[0061] In the embodiment of the present application, after performing an abnormal triggering operation on a target battery device in an energy storage device, target gas is collected from inside the energy storage device, so that the collected gas is almost all gas generated after performing the abnormal triggering operation, and the possibility of being mixed with other gases (such as air) is extremely low, which can effectively improve the accuracy of the collected gas, and then the collected gas can be used to better perform a thermal diffusion test on the energy storage device to improve the accuracy of the thermal diffusion test.

[0062] The energy storage system may include multiple energy storage devices, and the multiple energy storage devices may be arranged in a parallel distributed or stacked manner. When the multiple energy storage devices are arranged in a parallel distributed manner, there is no need to maintain a certain distance between the energy storage devices in the front row and the energy storage devices in the back row, and a shoulder-to-shoulder and back-to-back installation layout may be adopted.

[0063] The abnormality of the target battery device may be, but is not limited to, thermal runaway of the target battery, or the temperature of the target battery device reaches a preset temperature but thermal runaway does not occur.

[0064] The number of the target battery device may be one or more.

[0065] The target battery device may be any target battery device in the energy storage device.

[0066] Alternatively, the target battery device may be a battery device located at an edge position in the energy storage device.

[0067] Alternatively, after the abnormality triggering operation is performed on the target battery device, in order to allow the heat to spread to the periphery better and thus cause the entire energy storage device to become abnormal, the target battery device may be located at the center of the energy storage device.

[0068] Alternatively, considering that heat usually diffuses upward, in order to further spread the heat to the surrounding area, thereby causing the entire energy storage device to become abnormal, such as Figure 3 As shown, the target battery device may be located at the center of the energy storage device and close to the bottom wall of the energy storage device.

[0069] The bottom wall is a wall of the energy storage device perpendicular to the height direction, and when the energy storage device is in use, the bottom wall is located below the energy storage device. In other words, the target battery device can be located at the center and slightly below the energy storage device. Among them, the "below" in the embodiment of the present application means the same direction as the direction of gravity.

[0070] In some embodiments, S210 may specifically include: performing an abnormality triggering operation on at least some of the battery cells located in the middle position of the target battery device.

[0071] In general, when a battery device reaches a certain temperature, heat diffuses from the inside to the outside. Therefore, the above technical solution selects at least part of the battery cells in the center of the target battery device for triggering, so that after the abnormal triggering operation is performed on the target battery device, the heat diffuses from the middle to the outside, which is more in line with the actual situation.

[0072] A heating device may be provided in at least some of the battery cells located in the middle of the target battery device to perform the abnormal triggering operation. The heating device may be, for example, a heating film or a heating plate.

[0073] It should be noted that, in this embodiment, during the manufacturing stage, a heating device needs to be provided in advance in at least a portion of the battery cells located in the middle of the target battery device.

[0074] In other embodiments, Figure 4 As shown, S210 may specifically include: providing a heating device at an end of the target battery device, and triggering the heating device to perform an abnormality triggering operation.

[0075] That is, this embodiment performs an abnormality triggering operation on a target battery device by diffusing heat from the outside to the inside.

[0076] This technical solution performs an abnormal triggering operation on the target battery device by setting a heating device at the end of the target battery device. There is no need to set a heating device inside the target energy storage device in advance. The operation is relatively simple and the efficiency is high.

[0077] Optionally, the end plate of the target battery device may be removed to provide a heating device at the end of the target battery device.

[0078] A heating device may be provided at one end of the target battery device, or, in order to improve the efficiency of performing the abnormal triggering operation, a heating device may be provided at multiple ends of the target battery device. Figure 4 The heating device is disposed at two opposite ends of the target battery device, and the sizes of the two ends are larger than the sizes of the other two ends.

[0079] In addition to the two methods mentioned above for performing abnormal trigger operations on the target battery device, the embodiments of the present application may also use other methods to perform abnormal trigger operations, such as causing the target battery device to become abnormal by overcharging and heating. For another example, the target battery device may be caused to become abnormal by filling a combustible gas into the target battery device and then igniting it. For another example, the abnormal trigger operation may be performed by puncturing a battery cell.

[0080] It should be noted that when executing step S210, it is necessary to shield the fire protection function of the energy storage device and the energy storage system so that the heat of the target battery device can diffuse to other battery devices in the energy storage device after an abnormality occurs.

[0081] After performing the abnormal triggering operation, the target gas can be collected from inside the energy storage device.

[0082] As an example, when an abnormality occurs in the target battery device, the target gas may be collected from the inside of the energy storage device. At this time, the method 200 may further include: determining whether an abnormality occurs in the target battery device.

[0083] As another example, the target gas may be collected from the energy storage device at the first moment after the abnormal triggering operation on the target battery device is completed.

[0084] As another example, after the abnormal triggering operation is performed on the target battery device, the target gas can be collected from the energy storage device after a preset time interval, which can be 5ms, 10ms, 1s, 5s, etc.

[0085] In some embodiments, the target gas can be collected from inside the energy storage device through a through hole provided on the energy storage device.

[0086] The shape of the through hole can be circular, rectangular, hexagonal or irregular, etc.

[0087] The through hole can be set at any position of the energy storage device. For example, the through hole can be set on the side wall of the energy storage device. Alternatively, the through hole can be set on the top wall of the energy storage device and / or the first wall of the energy storage device. The top wall is a wall of the energy storage device that is perpendicular to the height direction, and when the energy storage device is in use, the top wall is located above the energy storage device. The "upper" in the embodiment of the present application means the direction opposite to the direction of gravity.

[0088] In this technical solution, since the gas usually diffuses from bottom to top, the through hole is arranged on the top wall of the energy storage device, which is conducive to collecting the target gas. In addition, the through hole is arranged on the first wall of the energy storage device, which further facilitates the collection of the target gas.

[0089] The first wall may be a side wall of the energy storage device. For example, a cabinet door of the energy storage device may be provided on the first wall, that is, the first wall is the front wall of the energy storage device.

[0090] like Figure 5 As shown, through hole A is arranged on the top wall of the energy storage device, and through hole B is arranged on the first wall of the energy storage device.

[0091] Considering that the target battery device inside the energy storage device is the first to generate the target gas, in order to collect the target gas faster, the position of the through hole on the energy storage device can be aligned with the target battery device (e.g. Figure 5 In other words, when the through hole is set on the top wall, the through hole can be set at a first position on the top wall, and the first position is the same as the position of the target battery device along the length direction (i.e., the x direction); and the first position is the same as the position of the target battery device along the width direction (i.e., the y direction). When the through hole is set on the first wall, the through hole can be set at a second position on the top wall, and the second position is the same as the position of the target battery device along the length direction, and the second position is the same as the position of the target battery device along the height direction (i.e., the z direction).

[0092] In this technical solution, when the through hole is set on the top wall, the through hole is at the same position as the target battery device along the length direction, and along the width direction, the through hole is at the same position as the target battery device; when the through hole is set on the first wall, the through hole is at the same position as the target battery device along the length direction, and along the height direction, the through hole is at the same position as the target battery device, that is, the position of the through hole on the energy storage device corresponds to the position of the target battery device. This setting method allows the target gas to be collected more quickly. In addition, since the target battery device may produce more target gas, the total amount of target gas collected is also greater, which is conducive to a series of subsequent operations based on the target gas.

[0093] Furthermore, the suction pipe can be connected to the through hole to collect the target gas. In other words, the suction pipe extending into the energy storage device through the through hole can be used to collect the target gas from the inside of the energy storage device. In this way, on the one hand, it is easy to implement, and on the other hand, the target gas collected by the suction pipe is almost all gas generated after an abnormality occurs, further reducing the possibility that the collected target gas is mixed with other gases.

[0094] The embodiment of the present application does not specifically limit the size and material of the intake pipe, as long as it is sealed and connected to the through hole. For example, the inner diameter of the intake pipe can be between 4 millimeters (mm) and 8 mm, for example, it can be 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm. The outer diameter of the intake pipe can be between 6mm and 10mm, for example, it can be 6.5mm, 7mm, 7.5,mm, 8mm, 8.5mm, 9mm, etc. The length of the intake pipe can be between 8 meters (m) and 12m, for example, it can be 8.5m, 9m, 9.5m, 10m, 10.5m, 11m, 11.5m, etc. The material of the intake pipe can be, but not limited to, aluminum, steel, etc. The steel can be, for example, stainless steel (for example, 304 stainless steel), carbon steel, etc.

[0095] It should be understood that in addition to providing through holes on the top wall and / or the first wall of the energy storage device, the embodiments of the present application can also utilize the floor drain in the energy storage device to collect the target gas. In this way, not only can the existing structure in the energy storage device be reused, there is no need to provide additional through holes, reducing the cost of collecting gas, but also the escape of most combustible gases can be avoided. In this case, further, the floor drain can be sealed to reduce the spread of gas or flame from the floor drain to the outside of the energy storage device. Exemplarily, the floor drain can be sealed by fireproof mud. Of course, other methods can also be used, and the embodiments of the present application are not specifically limited.

[0096] In order to obtain the changes in the concentration, composition and other parameters of the target gas over time, it is necessary to monitor the target gas in real time. However, usually, the components of the target gas may be as many as a dozen, and the equipment used to monitor and analyze the gas can only analyze four gases at a time. Therefore, collecting the target from the inside of the energy storage device may include: collecting the target gas from the inside of the energy storage device through multiple branches, and the multiple branches include a first branch and a second branch. At this time, method 200 may also include: real-time analysis of the target gas collected through the first branch, and collection of the target gas collected through the second branch.

[0097] The above technical solution collects target gas through multiple branches. In this way, after collecting the target gas, not only can the target gas be analyzed in real time, but the target gas can also be collected while analyzing the target gas, so that all gas components included in the target gas can be analyzed later through the collected target gas. The data obtained by this analysis is more accurate and can better provide important references for the energy storage system, such as performing thermal diffusion tests on energy storage devices based on target gases, thereby improving the accuracy of thermal diffusion tests on energy storage devices.

[0098] Optionally, refer again to Figure 5 , the target gas can be collected by a bag-shaped object (such as a sampling bag) or other objects. The target gas can be analyzed by a gas analysis device, for example, the gas analysis device can monitor the target gas in real time to determine the law of changes in parameters such as the concentration and composition of the target gas over time.

[0099] In this case, as an example, the target gas of the first branch may be collected through a through hole provided on the top wall, and the target gas of the second branch may be collected through a through hole provided on the first wall.

[0100] As another example, Figure 6As shown, the target gas collected through the through hole set on the top wall and the target gas collected through the through hole set on the first wall can be divided into two branches. At this time, the tail of the suction pipe can be divided into two branches, one of which is connected to the gas analysis device for analyzing the target gas, and the other branch is connected to the sampling bag for collecting the target gas.

[0101] The lengths of the air intake pipes of the two branches may be the same or different, and this embodiment of the present application does not specifically limit this.

[0102] In order to reduce the possibility of oversized particles inside the energy storage device entering the gas analysis device, a pre-filter can be set at the entrance or through hole of the air intake pipe to protect the gas analysis device. Optionally, the length of the pre-filter can be set between 8 centimeters (cm) and 25 cm, for example, 10 cm, 12 cm, 15 cm, 18 cm or 20 cm. The diameter of the pre-filter can be set between 10 millimeters (mm) and 20 mm, for example, 12 mm, 15 mm, 17 mm or 19 mm.

[0103] Alternatively, after the target gas is collected, the target gas may be divided into two branches, wherein the target gas in one branch is used for real-time analysis, and the target gas in the other branch is used for collection.

[0104] As mentioned above, the abnormality of the target battery device may include thermal runaway of the target battery device, that is, performing an abnormal triggering operation on the target battery device may include: triggering thermal runaway of the target battery device. In some cases, it is necessary to obtain the fire situation when the energy storage device burns and the impact on the surroundings. However, within a few hours after the energy storage device has thermal runaway, the energy storage device may only smoke and not burn.

[0105] Therefore, in some embodiments, the method 200 may further include: performing ignition inside the energy storage device.

[0106] Since the energy storage device may only smoke but not burn within a few hours after thermal runaway is triggered, the technical solution ignites the inside of the energy storage device after triggering thermal runaway of the target battery device. On the one hand, the energy storage device can be burned, and the fire situation and the impact on the surroundings when the energy storage device is burning can be obtained, which provides further reference for the thermal diffusion test of the energy storage device; on the other hand, the burning time of the energy storage device can be controlled, which is convenient for controlling the energy storage device.

[0107] In order to make the energy storage device burn faster, the ignition frequency can be set higher. For example, the ignition frequency can be once every 1 second (s), once every 2s, once every 3s, etc.

[0108] Alternatively, ignition may be performed anywhere in the energy storage device.

[0109] Or, if Figure 7 As shown, ignition can be performed at a target position inside the energy storage device, and the target position is located within a preset range centered on the target battery device. In other words, ignition is performed near the target battery device. Since the gas concentration near the target battery device is high, ignition is performed near the target battery device, making it easier for the energy storage device to burn.

[0110] Furthermore, ignition may be performed inside the energy storage device while thermal runaway occurs in the target battery device.

[0111] Alternatively, ignition may be performed inside the energy storage device after a preset time period has elapsed since thermal runaway of the target battery device occurred.

[0112] Alternatively, after the combustible gas appears inside the energy storage device, ignition can be performed inside the energy storage device. Since combustible gas usually explodes at the moment of ignition, ignition after the combustible gas appears inside the energy storage device can test whether the energy storage device will explode, thereby better performing the thermal diffusion test of the energy storage device.

[0113] The combustible gas can be detected by a gas detector. Since the gas concentration near the target battery device is high, in order to detect the combustible gas in a shorter time, the gas detector can be close to the target battery device to detect the combustible gas near the target battery device.

[0114] Furthermore, the method 200 may also include: collecting the target pressure inside the energy storage device. By collecting the pressure inside the energy storage device, it is convenient to use the pressure data for simulation later, thereby further providing simulation data support for the thermal diffusion test of the energy storage device.

[0115] The target pressure may be acquired after an abnormality occurs in the energy storage device, or the target pressure may be acquired after ignition.

[0116] The target pressure may be collected by a pressure sensor, and the position of the pressure sensor may be set by the user based on experience.

[0117] Alternatively, in some embodiments, the pressure sensor may be disposed at at least one of the following positions inside the energy storage device: a target position, a center position of the energy storage device, at least one corner of a top wall of the energy storage device, and at least one corner of a bottom wall of the energy storage device, wherein the target position is located within a preset range centered on the target battery device.

[0118] In the above technical solution, the pressure sensor is arranged at at least one of the following positions inside the energy storage device: the target position, the center position of the energy storage device, at least one corner of the top wall of the energy storage device, and at least one corner of the bottom wall of the energy storage device. In this way, the target pressure inside the energy storage device can be collected more comprehensively and accurately, so that the accuracy of subsequent operations based on the target pressure is higher.

[0119] Optionally, the number of pressure sensors to be set can be determined according to specific circumstances. For example, based on cost considerations, the number of pressure sensors can be set relatively small. Figure 8 As shown, pressure sensors are only set at four positions, namely, near the target energy storage device, two corners of the top wall of the energy storage device, and one corner of the bottom wall. For another example, if accuracy is considered, the number of pressure sensors can be set relatively more, for example, pressure sensors can be set at the eight corners of the energy storage device, near the target battery device, and at the center of the energy storage device.

[0120] After collecting the target gas, a thermal diffusion test can be performed on the energy storage device based on the target gas.

[0121] Optionally, a thermal diffusion test may be performed on the energy storage device based on at least one parameter of the target gas, such as volume, composition, pressure, density, temperature, etc.

[0122] For example, based on the composition of the target gas, it can be tested whether the target gas will pollute the atmospheric environment and whether it will cause harm to the health of rescue workers and surrounding residents.

[0123] For another example, the composition, temperature, pressure and other parameters of the target gas can be used to test whether an explosion will occur in the event of an abnormality or even a fire in the energy storage device.

[0124] In the embodiments of the present application, the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0125] Furthermore, under the premise of no conflict, the various embodiments and / or the technical features in the various embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination shall also fall within the protection scope of the present application.

[0126] The above describes in detail the method of thermal diffusion testing in the embodiment of the present application, and the following describes the device of thermal diffusion testing in the embodiment of the present application. It should be understood that the device of thermal diffusion testing in the embodiment of the present application can perform the method of thermal diffusion testing in the embodiment of the present application.

[0127] Fig. 9 FIG. 3 is a schematic block diagram of a device 300 for thermal diffusion testing according to an embodiment of the present application. Fig. 9 As shown, the device 300 for thermal diffusion testing includes: The trigger unit 310 is used to perform an abnormal trigger operation on a target battery device in the energy storage device.

[0128] The collection unit 320 is used to collect target gas from inside the energy storage device, where the target gas is gas generated when an abnormality occurs in the target battery device.

[0129] The testing unit 330 is used to perform a thermal diffusion test on the energy storage device according to the target gas.

[0130] Optionally, in an embodiment of the present application, the collection unit 320 is specifically used to collect the target gas from inside the energy storage device through a through hole arranged on the energy storage device, wherein the through hole is arranged on the top wall of the energy storage device and / or the first wall of the energy storage device.

[0131] Optionally, in the embodiment of the present application, the collection unit 320 is specifically used to collect the target gas from the inside of the energy storage device by using an air intake pipe extending into the inside of the energy storage device through the through hole.

[0132] Optionally, in an embodiment of the present application, the through hole is arranged at a first position of the top wall, and along the length direction, the first position is the same as the position of the target battery device, and along the width direction, the first position is the same as the position of the target battery device; and / or the through hole is arranged at a second position of the first wall, and along the length direction, the second position is the same as the position of the target battery device, and along the height direction, the second position is the same as the position of the target battery device.

[0133] Optionally, in an embodiment of the present application, the collection unit 320 is specifically used to: collect the target gas from inside the energy storage device through multiple branches, and the multiple branches include a first branch and a second branch; the thermal diffusion test device 300 also includes: an analysis unit, which is used to analyze the target gas collected through the first branch in real time; the collection unit 320 is specifically used to: collect the target gas collected through the second branch.

[0134] Optionally, in an embodiment of the present application, the trigger unit 310 is specifically used to: trigger thermal runaway of the target battery device; the thermal diffusion test device 300 also includes: an ignition unit, which is used to ignite at a target position inside the energy storage device when thermal runaway of the target battery device is triggered, and the target position is located within a preset range centered on the target battery device.

[0135] Optionally, in an embodiment of the present application, the ignition unit is specifically used to: detect combustible gas inside the energy storage device; and ignite at the target position when the combustible gas is detected.

[0136] Optionally, in the embodiment of the present application, the acquisition unit 320 is further used to: acquire a target pressure inside the energy storage device.

[0137] Optionally, in an embodiment of the present application, the acquisition unit 320 is specifically used to: acquire the target pressure through a pressure sensor, and the pressure sensor is arranged at at least one of the following positions inside the energy storage device: a target position, a center position of the energy storage device, at least one corner of the top wall of the energy storage device, and at least one corner of the bottom wall of the energy storage device, wherein the target position is located within a preset range centered on the target battery device.

[0138] Optionally, in the embodiment of the present application, the trigger unit 310 is specifically configured to: perform an abnormal trigger operation on at least some of the battery cells located in the middle position of the target battery device.

[0139] Optionally, in the embodiment of the present application, the trigger unit 310 is specifically used to: set a heating device at the end of the target battery device; and trigger the heating device to perform an abnormal trigger operation.

[0140] Optionally, in an embodiment of the present application, the target battery device is located at a central position of the energy storage device.

[0141] Optionally, in an embodiment of the present application, the target battery device is located at the center of the energy storage device and close to the bottom wall of the energy storage device.

[0142] Optionally, in an embodiment of the present application, the collection unit 320 is specifically used to collect the target gas from inside the energy storage device when an abnormality occurs in the target battery device.

[0143] It should be understood that the thermal diffusion test apparatus 300 can implement the corresponding operations in the thermal diffusion test method 200, which will not be described in detail for the sake of brevity.

[0144] Fig.104 is a schematic diagram of the hardware structure of the device 400 for thermal diffusion testing of an embodiment of the present application. The device 400 for thermal diffusion testing includes a memory 410, a processor 420, a communication interface 430 and a bus 440. The memory 410, the processor 420 and the communication interface 430 are connected to each other through the bus 440.

[0145] The memory 410 may be a read-only memory (ROM), a static storage device, and a random access memory (RAM). The memory 410 may store a program. When the program stored in the memory 410 is executed by the processor 420, the processor 420 and the communication interface 430 are used to execute the various steps of the method for thermal diffusion testing of the embodiment of the present application.

[0146] The processor 420 can adopt a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU) or one or more integrated circuits to execute relevant programs to implement the functions required to be performed by the units in the thermal diffusion testing device 400 of the embodiment of the present application, or to perform the thermal diffusion test method of the embodiment of the present application.

[0147] The processor 420 may also be an integrated circuit chip with signal processing capability. In the implementation process, each step of the method for thermal diffusion testing of the embodiment of the present application may be completed by hardware integrated logic circuits in the processor 420 or software instructions.

[0148] The processor 420 may also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The methods, steps, and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 410, and the processor 420 reads the information in the memory 410, and completes the functions required to be performed by the units included in the device 400 for the thermal diffusion test of the embodiment of the present application in combination with its hardware, or performs the method for the thermal diffusion test of the embodiment of the present application.

[0149] The communication interface 430 uses a transceiver device such as, but not limited to, a transceiver to implement communication between the heat diffusion test apparatus 400 and other devices or a communication network.

[0150] The bus 440 may include a path for transmitting information between various components of the apparatus for thermal spread testing 400 (eg, the memory 410 , the processor 420 , and the communication interface 430 ).

[0151] It should be noted that although the above-mentioned device 400 for thermal diffusion testing only shows a memory, a processor, and a communication interface, in the specific implementation process, those skilled in the art should understand that the device 400 for thermal diffusion testing may also include other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the device 400 for thermal diffusion testing may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the device 400 for thermal diffusion testing may also include only the devices necessary for implementing the embodiments of the present application, and does not necessarily include Fig.10 All devices shown in .

[0152] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program, wherein the computer program is used to execute the methods of the various embodiments of the present application described above.

[0153] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0154] An embodiment of the present application further provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the above-mentioned thermal diffusion test method.

[0155] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for thermal diffusion testing, characterized in that: The method comprises: Executing an abnormal triggering operation on a target battery device in the energy storage device; Collecting target gas from inside the energy storage device, wherein the target gas is gas generated after an abnormality occurs in the target battery device; A thermal diffusion test is performed on the energy storage device according to the target gas.

2. The method according to claim 1, characterized in that The collecting of the target gas from inside the energy storage device comprises: The target gas is collected from the inside of the energy storage device through a through hole arranged on the energy storage device, wherein the through hole is arranged on the top wall of the energy storage device and / or the first wall of the energy storage device.

3. The method according to claim 2, characterized in that The step of collecting the target gas from inside the energy storage device through a through hole provided on the energy storage device comprises: The target gas is collected from the interior of the energy storage device by using an air intake pipe extending into the interior of the energy storage device through the through hole.

4. The method according to claim 2 or 3, characterized in that: The through hole is disposed at a first position of the top wall, the first position being the same as the position of the target battery device along the length direction and the first position being the same as the position of the target battery device along the width direction; and / or The through hole is disposed at a second position of the first wall, the second position being the same as the position of the target battery device along the length direction and the second position being the same as the position of the target battery device along the height direction.

5. The method according to any one of claims 1 to 3, characterized in that The collecting of the target gas from inside the energy storage device comprises: Collecting the target gas from inside the energy storage device through a plurality of branches, wherein the plurality of branches include a first branch and a second branch; The method further comprises: The target gas collected through the first branch is analyzed in real time, and the target gas collected through the second branch is collected.

6. The method according to any one of claims 1 to 3, characterized in that The performing of an abnormal triggering operation on a target battery device in the energy storage device includes: triggering thermal runaway of the target battery device; The method further comprises: Ignition is performed at a target position inside the energy storage device, wherein the target position is located within a preset range centered on the target battery device.

7. The method according to claim 6, characterized in that The ignition at a target position inside the energy storage device comprises: detecting combustible gas inside the energy storage device; When the combustible gas is detected, ignition is performed at the target location.

8. The method according to any one of claims 1 to 3, characterized in that The method further comprises: The target pressure inside the energy storage device is collected.

9. The method according to claim 8, characterized in that The collecting the target pressure inside the energy storage device includes: The target pressure is collected by a pressure sensor, and the pressure sensor is arranged at at least one of the following positions inside the energy storage device: a target position, a center position of the energy storage device, at least one corner of a top wall of the energy storage device, and at least one corner of a bottom wall of the energy storage device, wherein the target position is located within a preset range centered on the target battery device.

10. The method according to any one of claims 1 to 3, characterized in that The performing of an abnormal triggering operation on a target battery device in the energy storage device includes: An abnormality triggering operation is performed on at least some of the battery cells located at the middle position of the target battery device.

11. The method according to any one of claims 1 to 3, characterized in that The performing of an abnormal triggering operation on a target battery device in the energy storage device includes: Disposing a heating device at an end of the target battery device; The heating device is triggered to perform an abnormal triggering operation.

12. The method according to any one of claims 1 to 3, characterized in that The target battery device is located at the center of the energy storage device.

13. The method according to claim 12, characterized in that The target battery device is located at the center of the energy storage device and close to the bottom wall.

14. The method according to any one of claims 1 to 3, characterized in that The collecting of the target gas from inside the energy storage device comprises: When an abnormality occurs in the target battery device, the target gas is collected from inside the energy storage device.

15. A device for thermal diffusion testing, characterized in that: The device comprises: A trigger unit, used to perform an abnormal trigger operation on a target battery device in the energy storage device; A collection unit, used to collect target gas from inside the energy storage device, wherein the target gas is gas generated after an abnormality occurs in the target battery device; The testing unit is used to perform a thermal diffusion test on the energy storage device according to the target gas.

16. A device for thermal diffusion testing, characterized in that: include: Memory, used to store programs; A processor is used to execute the program stored in the memory. When the program stored in the memory is executed, the processor is used to perform the method for thermal diffusion testing according to any one of claims 1 to 14.

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