Battery thermal runaway triggering method and system
By drilling holes in the battery pack and cell casing and using a puncture component to penetrate the inside of the cell to trigger a local short circuit, the problem of existing technologies being unable to effectively simulate actual battery thermal runaway scenarios is solved, achieving simplified operation and accurate simulation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2026-03-31
AI Technical Summary
Existing technologies cannot effectively simulate actual battery thermal runaway scenarios, and external heating plates are complex to operate and require extensive modifications.
By drilling holes in the battery pack casing and cell casing to create perforations, and using a puncture component to pierce into the cell to trigger a local short circuit, the internal thermal runaway of the battery is simulated.
It achieves accurate simulation of battery thermal runaway scenarios, simplifies the operation process, and avoids deep modification of the battery.
Smart Images
Figure CN121763101A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a method and system for triggering battery thermal runaway. Background Technology
[0002] The main purpose of thermal runaway testing for batteries (or battery packs) is to simulate the phenomenon of thermal runaway that occurs during normal use due to defects in the battery product itself.
[0003] In related technologies, thermal runaway is triggered by installing a heating plate on the outside of the battery. However, these technologies cannot be equated to actual battery thermal runaway scenarios. Summary of the Invention
[0004] In view of the above problems, this application provides a battery thermal runaway triggering method and system, which can solve the problem that related technologies cannot be equivalent to actual battery thermal runaway scenarios.
[0005] In a first aspect, this application provides a method for triggering battery thermal runaway, the method comprising:
[0006] Drilling is performed on a first position of the casing of the target battery pack and a second position of the casing of the target battery cell to form a first perforation at the first position and a second perforation at the second position; wherein the target battery cell is located in the target battery pack, and the projection of the first perforation on the casing of the target battery cell intersects with the second perforation;
[0007] Charge the target battery cell to the preset SOC;
[0008] The puncture part of the puncture assembly is inserted into the interior of the target battery cell through the first and second perforations in sequence, and the cap part of the puncture assembly covers the first perforation; wherein the puncture part and the cap part are connected to each other, and the cap part is located at one end of the puncture part in the axial direction.
[0009] In this embodiment, by drilling holes at a first position of the casing of the target battery pack and a second position of the casing of the target cell, a first perforation is formed at the first position and a second perforation is formed at the second position. After the target cell is charged to a preset SOC, the piercing part of the piercing component is controlled to pierce the interior of the target cell through the first and second perforations in sequence, thereby piercing the target component in the target cell and causing a local short circuit inside the target cell, thereby triggering thermal runaway of the target cell from the inside out, which can equivalently simulate the actual battery thermal runaway scenario.
[0010] In some embodiments, when a guide component is placed between the first perforation and the second perforation, controlling the piercing portion of the piercing component to sequentially pierce the interior of the target battery cell through the first perforation and the second perforation includes:
[0011] The puncture head is guided by the guide assembly to penetrate the target cell through the first and second perforations in sequence along the extension direction of the guide assembly.
[0012] In this embodiment, the puncture part is guided by the guide component to pierce the interior of the target cell through the first and second perforations in sequence along the extension direction of the guide component. This helps to pierce the target component in the target cell more accurately, so that a more accurate local short circuit occurs inside the target cell, thereby triggering thermal runaway of the target cell.
[0013] In some embodiments, drilling is performed on a first location of the casing of the target battery pack and a second location of the casing of the target battery cell, respectively, to form a first perforation at the first location and a second perforation at the second location, including:
[0014] Drilling is performed on a first position of the top cover of the target battery pack and a second position of the top cover of the target battery cell to form a first perforation at the first position and a second perforation at the second position.
[0015] In some embodiments, the projection of the first perforation onto the housing of the target cell can cover the second perforation, so that the piercing part of the piercing assembly can directly pierce the interior of the target cell through the first and second perforations in a straight line.
[0016] In some embodiments, controlling the puncture portion of the puncture assembly to sequentially pierce the interior of the target battery cell through a first perforation and a second perforation includes:
[0017] The cap of the puncture component is grasped by the grasping component;
[0018] The moving component drives the gripping component to move towards the casing of the target cell, so that the piercing part of the piercing component can sequentially pierce the interior of the target cell through the first and second piercing holes.
[0019] In this embodiment, the gripping component grips the cap of the puncture component, and the moving component moves the gripping component toward the housing of the target cell. This allows the puncture part of the puncture component to penetrate the interior of the target cell through the first and second perforations in sequence. This method can automatically trigger thermal runaway in the target cell, which is beneficial for protecting testing personnel.
[0020] In some embodiments, moving the grasping component towards the housing of the target battery cell via the moving component includes:
[0021] The moving component in the moving component is driven by the driving component to move along the first preset direction at the first moving speed, so as to drive the grasping component to move towards the casing of the target cell.
[0022] In some embodiments, the first moving speed is 1 mm / s to 8 mm / s.
[0023] In some embodiments, the method further includes:
[0024] In the event of thermal runaway in the target cell, the gripping component releases the cap of the puncturing component;
[0025] The moving component drives the gripping component to move away from the casing of the target battery pack.
[0026] In this embodiment, when the target cell experiences thermal runaway, the gripping component releases the cap of the puncture component, and the moving component drives the gripping component to move away from the target battery pack casing. This can prepare for the next thermal runaway triggering process and improve the efficiency of thermal runaway triggering.
[0027] In some embodiments, moving the grasping component to move it away from the housing of the target battery pack includes:
[0028] The moving component in the moving component is driven by the driving component to move along the second preset direction at the second moving speed, so as to drive the grasping component to move in a direction away from the housing of the target battery pack.
[0029] In some embodiments, the second moving speed is 3cm / s to 5cm / s.
[0030] In some embodiments, before the sealing drilling device drills holes at a first location in the housing of the target battery pack and a second location in the housing of the target battery cell, the method further includes:
[0031] The target cell is fully discharged to protect the target cell in the target battery pack during the drilling process.
[0032] Secondly, this application provides a battery thermal runaway triggering system, the system comprising:
[0033] A charging and discharging device is used to charge a target cell in a target battery pack to a preset SOC; wherein a first perforation is provided at a first position of the casing of the target battery pack, and a second perforation is provided at a second position of the casing of the target cell; the projection of the first perforation on the casing of the target cell intersects with the second perforation;
[0034] A liftable gripping device is used to control the piercing part of the piercing assembly to pierce the interior of the target battery cell in sequence through the first perforation and the second perforation, and the cap part of the piercing assembly covers the first perforation; wherein the piercing part and the cap part are connected to each other, and the cap part is located at one end of the piercing part in the axial direction.
[0035] In some embodiments, the puncture assembly further includes a first seal disposed on one side of the cap portion; wherein, when the cap portion covers the first perforation, the first seal is located between the cap portion and the first perforation.
[0036] In this embodiment of the application, by setting a first sealing element, the cap of the puncture component can seal the first perforation, which can prevent oxygen from entering the target battery pack through the first perforation during the thermal runaway of the target cell, and also prevent thermal runaway gas from being ejected from the first perforation, thus changing the failure path of thermal runaway, thereby simulating the battery thermal runaway scenario more effectively.
[0037] In some embodiments, the length of the puncture portion is greater than the vertical distance between the housing of the target battery pack and the housing of the target cell.
[0038] In some embodiments, the system further includes a guide component; wherein the guide component is positioned between the first perforation and the second perforation to guide the puncture portion to sequentially pass through the first perforation and the second perforation along the extension direction of the guide component and pierce into the interior of the target battery cell.
[0039] In some embodiments, a first perforation is provided at a first position of the top cover of the target battery pack, and a second perforation is provided at a second position of the top cover of the target battery cell.
[0040] In some embodiments, the projection of the first perforation onto the housing of the target cell may cover the second perforation.
[0041] In some embodiments, the system further includes a second seal, wherein the second seal is disposed between the guide assembly and the second perforation.
[0042] In some embodiments, the liftable gripping device includes:
[0043] The gripping component is used to grip the cap of the puncture component;
[0044] A movable component connected to the gripping component is used to move the gripping component toward the housing of the target battery cell, so as to drive the piercing part of the piercing component to pierce into the interior of the target battery cell through the first piercing hole and the second piercing hole in sequence.
[0045] In some embodiments, the moving component includes a drive element and a moving element; wherein the grasping component is connected to the moving element.
[0046] A driving component is used to drive a moving component to move along a first preset direction at a first moving speed, so as to move the gripping assembly toward the housing of the target battery cell.
[0047] In some embodiments, the gripping component is also used to: release the cap portion of the puncture component in the event of thermal runaway of the target cell;
[0048] The moving component is also used to drive the gripping component to move away from the housing of the target battery pack.
[0049] In some embodiments, the drive member is further configured to drive the movable member in the movable assembly to move along a second preset direction at a second moving speed, so as to drive the gripping assembly to move in a direction away from the housing of the target battery pack.
[0050] In some embodiments, the charging and discharging equipment is also used to perform a full discharge process on the target battery cell.
[0051] In some embodiments, the diameter of the puncture site is 0.5 mm to 1 mm.
[0052] In some embodiments, the puncture site is made of any of the following materials: aluminum alloy, copper alloy, or tungsten carbide alloy.
[0053] In some embodiments, the diameter of the first perforation is 3mm to 4mm; and / or,
[0054] The diameter of the second perforation is 1mm~2mm.
[0055] In some embodiments, a temperature acquisition component is provided on the casing of the target cell and on the casing of each cell adjacent to the target cell in the target battery pack.
[0056] Temperature acquisition component, used to acquire the temperature of the corresponding battery cell.
[0057] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0058] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0059] Figure 1 This is a schematic diagram of the structure of a battery thermal runaway triggering system provided in some embodiments of this application;
[0060] Figure 2 This is a flowchart illustrating a battery thermal runaway triggering method provided in some embodiments of this application;
[0061] Figure 3 This is a schematic diagram of the structure of the puncture assembly provided in some embodiments of this application;
[0062] Figure 4 This is a schematic diagram of the puncture assembly provided in other embodiments of this application;
[0063] Figure 5 A schematic diagram illustrating the arrangement of guide components provided in some embodiments of this application;
[0064] Figure 6 This is a schematic diagram of the structure of a battery thermal runaway triggering system provided in some other embodiments of this application;
[0065] Figure 7 A schematic flowchart illustrating a battery thermal runaway triggering method provided in other embodiments of this application;
[0066] Figure 8 This is a schematic diagram of the structure of a battery thermal runaway triggering system provided in some other embodiments of this application;
[0067] Figure 9 A schematic flowchart illustrating a battery thermal runaway triggering method provided in other embodiments of this application;
[0068] Figure 10 This is a flowchart illustrating a battery thermal runaway triggering method provided in other embodiments of this application. Detailed Implementation
[0069] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0071] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly defined.
[0072] The battery thermal runaway triggering method and system provided in this application can be applied to battery thermal runaway propagation testing (or battery thermal runaway detection); of course, it can also be applied to other application scenarios.
[0073] In related technologies, thermal runaway is triggered by installing a heating plate on the outside of the battery. This external heating plate method requires the battery casing to first fail and deform, then triggering thermal runaway in the internal battery cells; that is, the battery failure proceeds from the outside in. Since real-world battery thermal runaway scenarios typically simulate internal short circuits within the battery cells (i.e., failure proceeds from the inside out), these technologies cannot accurately represent actual battery thermal runaway scenarios. Furthermore, using an external heating plate usually requires significant battery modification, resulting in operational complexity.
[0074] To address the problems in related technologies, this application proposes to drill holes in the casing of the target battery pack and the casing of the target cell, respectively, to form a first perforation in the casing of the battery pack and a second perforation in the casing of the target cell. After charging the target cell to a preset SOC, the piercing part of the piercing component is controlled to pierce the interior of the target cell through the first and second perforations in sequence, thereby piercing the target component in the target cell and causing a local short circuit inside the target cell, thereby triggering thermal runaway from the inside out of the target cell, which can equivalently simulate the actual battery thermal runaway scenario.
[0075] For ease of understanding, the relevant content of the battery thermal runaway triggering system will be described and explained in this application embodiment by way of example.
[0076] For ease of understanding, the relevant content of the battery thermal runaway triggering system will be described and explained in this application embodiment by way of example.
[0077] In some embodiments, Figure 1 This is a schematic diagram of the structure of a battery thermal runaway triggering system provided in some embodiments of this application, such as... Figure 1 As shown, the battery thermal runaway triggering system of this application embodiment may include: a charging and discharging device 11 and a lifting and grasping device 12.
[0078] The charging and discharging device 11 in this embodiment can be connected to the target battery pack (or trigger battery pack) 10 to charge and discharge a target cell (or trigger cell) at a preset position in the target battery pack 10. The target battery pack 10 may include multiple cells C, and the target cell can be one of the multiple cells C. It should be understood that the target battery pack 10 may include, but is not limited to, a housing 10H of the target battery pack 10 and multiple cells C located within the housing 10H of the target battery pack 10. The housing 10H of the target battery pack 10 may include, but is not limited to, a top cover 10H1 and a casing 10H2 of the target battery pack 10. For example, Figure 1 The example shown is that multiple battery cells C are located in the housing 10H2 of the target battery pack 10.
[0079] It should be noted that, in the embodiments of this application, a first perforation may be provided at a first position in the housing of the target battery pack, and a second perforation may be provided at a second position in the housing of the target battery cell. The projection of the first perforation on the housing of the target battery cell may intersect with the second perforation, so that the piercing part of the piercing component 13 can directly pierce into the interior of the target battery cell through the first perforation and the second perforation.
[0080] For example, the liftable gripping device 12 can control the piercing part of the piercing component 13 to pierce into the interior of the target battery cell through the first piercing hole and the second piercing hole in sequence, causing a partial short circuit inside the target battery cell, thereby triggering thermal runaway of the target battery cell.
[0081] Of course, the battery thermal runaway triggering system in this application embodiment may also include other devices, such as a drilling device.
[0082] In some embodiments, Figure 2 This is a flowchart illustrating a battery thermal runaway triggering method provided in some embodiments of this application, such as... Figure 2 As shown, the battery thermal runaway triggering method in this application embodiment may include the following steps:
[0083] Step S201: Drill holes at a first position of the casing of the target battery pack and a second position of the casing of the target cell, respectively, to form a first perforation at the first position and a second perforation at the second position; wherein the target cell is located in the target battery pack, and the projection of the first perforation on the casing of the target cell intersects with the second perforation.
[0084] In this step, on the one hand, a hole can be drilled at a first position in the casing of the target battery pack to form a first perforation, so that the piercing part 13a of the piercing assembly 13 can directly extend into the interior of the target battery pack through the first perforation. On the other hand, a hole can be drilled at a second position in the casing of the target cell in the target battery pack to form a second perforation, so that the piercing part 13a of the piercing assembly 13 can directly extend into the interior of the target cell through the second perforation. This can reduce the damage and interference to the target cell during the direct piercing process (without pre-drilling), and is conducive to achieving local piercing and micro-short circuit of the target cell, thereby more equivalent to the actual battery thermal runaway condition.
[0085] In this embodiment, the projection of the first perforation on the casing of the target battery cell intersects with the second perforation, so that the piercing part 13a of the piercing assembly 13 can directly pierce the interior of the target battery cell through the first perforation and the second perforation in sequence.
[0086] For example, the projection of the first perforation on the housing of the target cell can cover the second perforation (cover all of the second perforation, i.e., completely cover the second perforation), so that the piercing part 13a of the piercing assembly 13 can directly pierce the interior of the target cell through the first perforation and the second perforation in a straight line.
[0087] In another example, the projection of the first perforation onto the housing of the target cell can be located in the second perforation, so that the piercing portion 13a of the piercing assembly 13 can pass through the first perforation and the second perforation more smoothly into the interior of the target cell.
[0088] As another example, the projection of the first perforation onto the casing of the target cell may partially overlap with that of the second perforation.
[0089] In one possible implementation, holes can be drilled at a first position on the top cover of the target battery pack and at a second position on the top cover of the target battery cell, respectively, to form a first perforation at the first position and a second perforation at the second position.
[0090] In this implementation, when the target battery pack is placed upright, holes are drilled at the first position of the top cover of the target battery pack and the second position of the top cover of the target battery cell to form a first perforation at the first position and a second perforation at the second position. This allows the piercing part 13a of the piercing assembly 13 to directly pierce into the interior of the target battery cell through the first and second perforations in sequence, thereby triggering thermal runaway of the target battery cell from the inside out.
[0091] In another possible implementation, holes can be drilled at a first position on the first target housing wall in the housing of the target battery pack and at a second position on the second target housing wall in the housing of the target cell, to form a first through hole at the first position and a second through hole at the second position. For example, the first target housing wall can be a housing wall in the housing of the target battery pack that is opposite to the top cover (or referred to as the bottom plate of the target battery pack), and the second target housing wall can be a housing wall in the housing of the target cell that is opposite to the top cover (or referred to as the bottom plate of the target cell).
[0092] In this implementation, when the target battery pack is placed upside down, holes are drilled at a first position on the first target housing wall (or the bottom plate of the target battery pack) and a second position on the second target housing wall (or the bottom plate of the target cell) in the target cell housing. This creates a first perforation at the first position and a second perforation at the second position, allowing the piercing part 13a of the piercing assembly 13 to directly penetrate the interior of the target cell through the first and second perforations, thereby triggering thermal runaway from the inside out of the target cell.
[0093] Of course, in this embodiment of the application, other locations in the housing of the target battery pack and other locations in the housing of the target battery cell can also be drilled.
[0094] For ease of understanding, the following embodiments of this application provide exemplary descriptions of the drilling process.
[0095] In one possible implementation, a sealing perforation process can be performed on a first position of the casing of the target battery pack and a second position of the casing of the target battery cell using a drilling device, to form a first perforation at the first position and a second perforation at the second position. The drilling device may include, but is not limited to, any of the following: a pneumatic drilling machine (or air gun), a laser drilling machine, an ultrasonic drilling machine, an electric drilling machine, or a hydraulic punching machine.
[0096] For example, a hole can be created by using a specially designed hollow sealing nail and an air gun to penetrate the casing of the target battery cell.
[0097] In another possible implementation, sealing perforations can be performed on the first position of the target battery pack casing and the second position of the target cell casing by means of chemical etching, electrical discharge drilling or mechanical punching, so as to form a first perforation at the first position and a second perforation at the second position.
[0098] Of course, other methods can also be used to perform sealing perforation on the first position of the target battery pack casing and the second position of the target cell casing.
[0099] It should be understood that the order in which the casing of the target battery pack and the casing of the target battery cell are drilled is not limited in the embodiments of this application.
[0100] Step S202: Charge the target battery cell to the preset SOC.
[0101] In this step, the target cell is charged to a preset SOC so that when the puncture part 13a of the puncture assembly 13 punctures into the interior of the target cell through the first and second perforations, thermal runaway of the target cell can be quickly triggered.
[0102] In some embodiments, the preset SOC may include, but is not limited to, a preset trigger SOC. This can be achieved by fully charging the target cell to the preset trigger SOC, so that when the puncture portion 13a of the puncture assembly 13 sequentially penetrates the interior of the target cell through the first and second perforations, thermal runaway of the target cell can be triggered more quickly. For example, the preset trigger SOC may include, but is not limited to, 90% to 100%.
[0103] In some embodiments, the preset SOC may include, but is not limited to, a preset non-trigger SOC. This can be achieved by charging the target cell to the preset SOC, so that when the puncture portion 13a of the puncture assembly 13 sequentially penetrates the interior of the target cell through the first and second perforations, thermal runaway of the target cell can be quickly triggered. For example, the preset non-trigger SOC may be less than the preset trigger SOC.
[0104] For example, the target battery cell can be charged to a preset SOC at a first preset rate, wherein the first preset rate may include, but is not limited to, 0.33C to 1C. For instance, the first preset rate may be 1C.
[0105] Another example is that the target battery cell can be charged to a preset SOC by a preset rate of change.
[0106] In one possible implementation, the target battery cell can be charged to a preset SOC using a charging and discharging device.
[0107] Another possible implementation is to charge the target battery cell to a preset SOC using a smart charging device or a dedicated charger.
[0108] Step S203: Control the puncture part of the puncture assembly to puncture the interior of the target cell through the first perforation and the second perforation in sequence, and the cap part of the puncture assembly covers the first perforation; wherein, the puncture part and the cap part are connected to each other, and the cap part is located at one end of the puncture part in the axial direction.
[0109] In some embodiments, for ease of understanding, the present application provides an exemplary description of the puncture component 13.
[0110] Figure 3 This is a schematic diagram of the structure of the puncture assembly provided in some embodiments of this application, such as... Figure 3 As shown, the puncture assembly 13 may include a puncture portion 13a and a cap portion 13b. The puncture portion 13a and the cap portion 13b are interconnected, and the cap portion 13b is located at one end of the puncture portion 13a in the axial direction, so that when the puncture portion 13a of the puncture assembly 13 sequentially pierces the interior of the target battery cell through the first perforation and the second perforation, the cap portion 13b of the puncture assembly 13 can cover the first perforation; wherein the diameter of the cap portion 13b may be larger than the diameter of the first perforation.
[0111] For example, the diameter of the cap portion can be 5mm to 6mm. For instance, if the diameter of the first perforation is 3mm, the diameter of the cap portion can be 5mm.
[0112] In some embodiments, the length of the puncture portion 13a in this application embodiment can be greater than the vertical distance between the casing of the target battery pack and the casing of the target cell, so that the puncture portion 13a of the puncture assembly 13 can penetrate into the interior of the target cell after passing through the first and second perforations, thereby piercing the target components (e.g., separator, or separator and positive electrode, or separator and negative electrode, or separator, positive electrode, and negative electrode, etc.) in the target cell. For example, the length of the puncture portion 13a can be the sum of the vertical distance between the casing of the target battery pack and the casing of the target cell and a preset length, wherein the preset length can be 3cm to 5cm.
[0113] For example, the other end of the puncture portion 13a opposite to the cap portion 13b can be a sharp end so that the puncture portion 13a can pierce the target component in the target cell.
[0114] In this embodiment, the puncture part can be made of a special metal with high hardness and corrosion resistance, so that the puncture part has a certain rigidity, so that it can puncture the target component in the target battery cell.
[0115] For example, the material of the puncture site in this application is, but is not limited to, any of the following: aluminum alloy, copper alloy, or tungsten carbide alloy.
[0116] For example, the diameter of the puncture portion 13a in this application can be 0.5mm to 1mm, so that while puncturing the target component in the target cell, the damage to the target cell is small and the target cell is not deformed.
[0117] In this embodiment, the diameter of the first perforation and the second perforation can be greater than or equal to the diameter of the puncture portion 13a, so that the puncture portion 13a can pass through the first perforation and the second perforation.
[0118] It should be noted that the dimensions of the puncture portion 13a and the cap portion 13b of the puncture component 13 involved in this application embodiment are exemplary values, and can be designed accordingly based on the dimensions of different battery packs.
[0119] In this step, the puncture part 13a of the puncture component 13 can be controlled to directly puncture the interior of the target battery cell through the first and second perforations in sequence, so as to puncture the target component in the target battery cell. At the moment when the puncture part 13a punctures the target component, a local short circuit occurs inside the target battery cell, thereby causing a violent temperature rise in the target battery cell, which triggers thermal runaway of the target battery cell from the inside to the outside (it has been verified that the instantaneous temperature rise rate dT / dt of the target battery cell in this embodiment is ≥1℃ / s and the duration is more than 3s).
[0120] In summary, compared to the external heating plate method in related technologies, in this embodiment, by drilling holes at the first position of the target battery pack casing and the second position of the target cell casing respectively, a first perforation is formed at the first position and a second perforation is formed at the second position. After the target cell is charged to a preset SOC, the piercing part of the piercing component is controlled to pierce the interior of the target cell through the first and second perforations in sequence, thereby piercing the target component in the target cell and causing a local short circuit inside the target cell, thereby triggering thermal runaway from the inside to the outside of the target cell, which can equivalently simulate the actual battery thermal runaway scenario.
[0121] In some embodiments, Figure 4 The diagram below illustrates the structure of a puncture assembly provided in other embodiments of this application. Considering that in actual battery thermal runaway scenarios, thermal runaway gases and other contaminants would be discharged through the battery pack's explosion-proof valve, to better simulate battery thermal runaway scenarios, the puncture assembly 13 in this embodiment may further include a first sealing member 13c disposed on one side of the cap portion 13b. Wherein, when the cap portion 13b covers the first perforation, the first sealing member 13c is located between the cap portion 13b and the first perforation, thereby achieving a sealable coverage of the first perforation by the cap portion 13b.
[0122] For example, the first seal 13c may include, but is not limited to, a sealing gasket, a sealing washer, or a sealing plug. For instance, the first seal 13c may be a rubber plug.
[0123] In this embodiment, by setting a first sealing element, the cap portion 13b of the puncture component 13 can sealably cover the first perforation, which can prevent oxygen from entering the target battery pack through the first perforation during the thermal runaway of the target cell, and also prevent thermal runaway gas from being ejected from the first perforation, thus changing the failure path of thermal runaway. That is, in this embodiment, during the thermal runaway of the target cell in the target battery pack, thermal runaway gas and the like will still be discharged through the explosion-proof valve of the target battery pack, thereby more effectively simulating the battery thermal runaway scenario.
[0124] In some embodiments, in order to further control the direction in which the puncture portion of the puncture assembly pierces into the target battery pack, Figure 5 This is a schematic diagram illustrating the arrangement of guide components provided in some embodiments of this application, such as... Figure 5 As shown, the battery thermal runaway triggering system of this application embodiment may further include a guide component 14, wherein the guide component 14 may be placed between the first perforation P1 and the second perforation P2.
[0125] Correspondingly, when a guide component 14 is placed between the first perforation P1 and the second perforation P2, the above step S203 may include: guiding the piercing part along the extension direction of the guide component through the guide component 14 to pierce the interior of the target cell through the first perforation and the second perforation.
[0126] In this embodiment, the puncture part is guided by the guide component 14 to pierce the interior of the target cell through the first puncture hole P1 and the second puncture hole P2 in sequence along the extension direction of the guide component. This helps to pierce the target component in the target cell more accurately, so that a more accurate local short circuit occurs inside the target cell, thereby triggering thermal runaway of the target cell.
[0127] In one possible implementation, the guide component 14 can be a hollow tubular structure. Figure 5 (As illustrated in the example), its inner diameter can be greater than or equal to the diameter of the puncture portion, so that the puncture portion can sequentially penetrate the interior of the target battery cell through the first and second perforations along the extension direction of the guide assembly 14. For example, the guide assembly 14 can adopt a guide tube structure.
[0128] For example, the diameter of the first through hole can be greater than or equal to the outer diameter of the guide component 14, so that the guide component 14 can pass through the first through hole and be disposed between the first through hole and the second through hole. It should be understood that one end of the guide component 14 can be fixed to the first through hole, and the other end of the guide component 14 can be connected to the second through hole, wherein the inner diameter of the guide component 14 can be greater than or equal to the diameter of the second through hole, so that the other end of the guide component 14 can be connected to the second through hole.
[0129] For example, the diameter of the first perforation can be 3mm to 4mm; and / or, the diameter of the second perforation can be 1mm to 2mm.
[0130] For example, if the diameter of the puncture site is 0.5 mm, the diameter of the first perforation can be 3 mm, the diameter of the second perforation can be 1 mm, and correspondingly, the outer diameter of the guide assembly can be 3 mm and the inner diameter can be 1.5 mm.
[0131] It should be noted that, in the absence of a guide component between the first and second perforations, the diameters of the first and second perforations can be slightly larger than the diameter of the puncture part 13a. This allows the puncture part 13a to pass through the first and second perforations while also minimizing the gap between the puncture part 13a and each perforation.
[0132] In another possible implementation, the guide component 14 can be a semi-hollow tubular structure so that the piercing part can sequentially pierce the interior of the target battery cell through the first perforation and the second perforation along the extension direction of the guide component 14.
[0133] In some embodiments, to better simulate battery thermal runaway scenarios, the battery thermal runaway triggering system of this application embodiment may further include a second seal ( Figure 5 (not shown in the image). The second seal is placed between the guide assembly 14 and the second perforation P2 so that the guide assembly 14 can be sealed with the second perforation P2. This can prevent thermal runaway gases from being ejected from the second perforation, thus changing the failure path of thermal runaway and more effectively simulating the battery thermal runaway scenario.
[0134] In one possible implementation, the second seal may include, but is not limited to, a gasket or a sealing washer.
[0135] In another possible implementation, the second seal can be a seal obtained by sealing the guide assembly and the second perforation using a sealing device. The sealing device can include, but is not limited to, any of the following: a glue dispensing machine, a sealant nail vacuum sealing machine, or a sealant gun.
[0136] For example, AB glue or other high-strength adhesives can be applied between the guide assembly and the second perforation using a sealing device to form a second seal.
[0137] In some embodiments, Figure 6 This is a schematic diagram of the structure of a battery thermal runaway triggering system provided in other embodiments of this application, such as... Figure 6As shown, the liftable gripping device 12 may include a gripping component 121 and a moving component 122 connected to the gripping component 121. The gripping component 121 can be used to grip the puncture component 13, and the moving component 122 can be used to move the gripping component 121.
[0138] Figure 7 This is a flowchart illustrating a battery thermal runaway triggering method provided in other embodiments of this application, such as... Figure 7 As shown, step S203 above may include:
[0139] Step S203A: Grasp the cap of the puncture component using the grasping component.
[0140] In this step, the cap of the puncture component 13 can be grasped by the grasping component 121, so that the puncture component can be grasped quickly and accurately.
[0141] For example, the gripping component 121 may include, but is not limited to, a gripping clamp and a crossbeam for fixing the gripping clamp. The crossbeam may be connected to the moving component 122 so that the gripping clamp can move up and down and / or left and right under the action of the moving component 122.
[0142] Of course, the grabbing component 121 can also be implemented using other structures that can be used to achieve the mobile grabbing function.
[0143] Step S203B: The moving component drives the gripping component to move towards the casing of the target battery cell, so that the piercing part of the piercing component can sequentially pierce the interior of the target battery cell through the first and second perforations.
[0144] In this step, the moving component 122 drives the gripping component 121 to move towards the shell of the target battery cell, so that the piercing part of the piercing component can pierce the inside of the target battery cell through the first and second perforations in sequence, so as to pierce the target component in the target battery cell, causing a local short circuit inside the target battery cell, thereby triggering thermal runaway of the target battery cell from the inside out.
[0145] In some embodiments, Figure 8 This is a schematic diagram of the structure of a battery thermal runaway triggering system provided in other embodiments of this application, such as... Figure 8 As shown, the moving component 122 may include a driving component 122a and a moving component 122b; wherein, the gripping component 121 may be connected to the moving component 122b so that the gripping component 121 can move under the drive of the moving component 122b.
[0146] In this embodiment of the application, the moving component 122b in the moving component 122 is driven by the driving component 122a in the moving component 122 to move along the first preset direction D1 at a first moving speed, so that the gripping component 121 can move towards the shell of the target battery cell, thereby driving the piercing part of the piercing component to pierce into the interior of the target battery cell through the first piercing hole and the second piercing hole in sequence.
[0147] For example, the driving member 122a may include, but is not limited to, a motor driving member or a hydraulic driving member, and the moving member 122b may include, but is not limited to, a movable track connected to the driving member 122a, so as to move under the drive of the driving member 122a. It should be understood that the gripping component 121 may be fixedly connected to the moving member 122b so as to drive the gripping component 121 to move when the moving member 122b moves.
[0148] For example, the first moving speed may include, but is not limited to, 1 mm / s to 8 mm / s.
[0149] Of course, the moving component can also be used in other ways to move the grasping component toward the casing of the target cell.
[0150] In summary, in this embodiment of the application, by gripping the cap of the puncture component and moving the gripping component towards the housing of the target cell by the grasping component, the puncture part of the puncture component is driven to pierce the interior of the target cell through the first and second perforations in sequence. This can automatically trigger thermal runaway of the target cell, which is beneficial to protecting the testing personnel.
[0151] In some embodiments, Figure 9 This is a flowchart illustrating a battery thermal runaway triggering method provided in other embodiments of this application, such as... Figure 9 As shown, the battery thermal runaway triggering method in this application embodiment may further include the following steps:
[0152] Step S204: In the event of thermal runaway of the target cell, the gripping component releases the cap of the puncture component.
[0153] In this step, if thermal runaway occurs in the target cell, the gripping component 121 can release the cap of the puncture component so that the puncture part of the puncture component will not move under the action of the moving component 122.
[0154] Step S205: Move the gripping component away from the target battery pack housing by moving the moving component.
[0155] In this step, the moving component 122 drives the gripping component 121 to move away from the casing of the target battery pack, so that the gripping component 121 can move to the preset initial position.
[0156] For example, the moving component 122b in the moving component 122 is driven by the driving component 122a in the moving component 122 to move along a second preset direction at a second moving speed, so that the gripping component 121 can move away from the casing of the target battery pack, in preparation for the next cell thermal runaway triggering process. The second preset direction may be the opposite of the first preset direction.
[0157] For example, the second moving speed is 3cm / s to 5cm / s.
[0158] In summary, in the embodiments of this application, when the target cell experiences thermal runaway, the gripping component releases the cap of the puncture component, and the moving component drives the gripping component to move away from the target battery pack casing. This can prepare for the next thermal runaway triggering process of the cell, which is beneficial to improving the efficiency of thermal runaway triggering.
[0159] In some embodiments, considering that drilling the target cell may pose certain safety hazards when the target cell has a large amount of charge, this application embodiment can perform a full discharge process on the target cell before the above step S201, so as to help protect the target cell in the target battery pack during the drilling process.
[0160] For example, the target cells in the target battery pack can be fully discharged at a second preset rate, wherein the second preset rate may include, but is not limited to, 0.33C to 1C. For instance, the second preset rate may be 0.33C.
[0161] In one possible implementation, the target cells in the target battery pack can be fully discharged using a charging and discharging device.
[0162] Another possible implementation method is to fully discharge the target cells in the target battery pack by means of bulb discharge, electrolyte discharge, or high-power resistor discharge.
[0163] Of course, other methods can also be used to fully discharge the target cells in the target battery pack.
[0164] In some embodiments, in order to facilitate subsequent research and analysis of the thermal runaway process of the target cell in the target battery pack, the housing of the target cell and the housing of each cell adjacent to the target cell in the target battery pack may be provided with corresponding temperature acquisition components; wherein, the temperature acquisition components can be used to acquire the temperature of the corresponding cell.
[0165] For example, the temperature acquisition component may include, but is not limited to, a temperature sensor or a thermocouple. It should be understood that the temperature acquisition component in this embodiment can record the temperature of the corresponding battery cell in real time, or can record the temperature of the corresponding battery cell at preset intervals.
[0166] For example, in the embodiments of this application, the top cover of the target cell and the top cover of each cell adjacent to the target cell in the target battery pack can be provided with corresponding temperature acquisition components so that the temperature at the corresponding position can be collected respectively.
[0167] It should be noted that the temperature acquisition component in this embodiment can also be set in other locations of the corresponding battery cell (such as the side wall or bottom plate of the battery cell), and this embodiment does not limit this.
[0168] In some embodiments, based on the above embodiments, this application takes as an example a guide component is provided between the first perforation and the second perforation, and the moving component 122 includes a driving member 122a and a moving member 122b, to exemplarily describe the overall process of the battery thermal runaway triggering method. Figure 10 This is a flowchart illustrating a battery thermal runaway triggering method provided in other embodiments of this application, in conjunction with... Figure 8 and Figure 10 As shown, the method in this application embodiment may include the following steps:
[0169] Step S1001: Open the top cover of the target battery pack.
[0170] Step S1002: Fully discharge the target cells in the target battery pack.
[0171] For example, the target cells in the target battery pack can be fully discharged according to a second preset rate.
[0172] Step S1003: Drill a hole in the first position of the top cover of the target battery pack to form a first perforation at the first position.
[0173] For example, the diameter of the first perforation can be 3 mm.
[0174] Step S1004: Drill a hole in the second position of the top cover of the target cell to form a second perforation at the second position.
[0175] For example, the diameter of the second perforation can be 1 mm.
[0176] Step S1005: A guide component is provided between the first perforation and the second perforation, and a second seal is provided between the guide component and the second perforation.
[0177] For example, the outer diameter of the guide component can be 3 mm and the inner diameter can be 1.5 mm.
[0178] For example, AB glue can be disposed between the guide assembly 14 and the second perforation to form a second seal.
[0179] Step S1006: Fully charge the target battery cell to the preset trigger SOC.
[0180] For example, the target battery cell can be fully charged to a preset state of charge (SOC) at a first preset rate.
[0181] Step S1007: Temperature acquisition components are installed on the top cover of the target cell and on the top cover of each cell adjacent to the target cell in the target battery pack.
[0182] Step S1008: Grasp the cap of the puncture component using the grasping component.
[0183] Step S1009: Drive the moving component in the moving component to move along the first preset direction at the first moving speed by the driving component in the moving component, so as to drive the grasping component to move towards the top cover of the target cell, thereby driving the piercing part of the piercing component to pierce the inside of the target cell through the first piercing hole and the second piercing hole in sequence, so as to pierce the target component in the target cell and trigger the target cell to undergo thermal runaway from the inside to the outside.
[0184] For example, the cap portion of the puncture assembly sealably covers the first perforation.
[0185] Step S1011: In the event of thermal runaway of the target cell, the gripping component releases the cap of the puncture component.
[0186] Step S1012: Move the grasping component away from the top cover of the target battery pack by moving the moving component.
[0187] In this application, by drilling holes in the top cover of the target battery pack and the top cover of the target cell respectively, a first perforation is formed in the top cover of the target battery pack and a second perforation is formed in the top cover of the target cell in advance. This reduces the damage and interference to the target cell during the direct puncture process (without pre-drilling), and facilitates the local puncture and micro-short circuit of the target cell, thus more effectively mimicking the actual battery thermal runaway condition. Furthermore, the grasping component grasps the cap of the puncture component, and the driving component in the moving component drives the moving component to move along a first preset direction at a first moving speed. This causes the grasping component to move towards the top cover of the target cell, thereby causing the puncture part of the puncture component to directly pierce the interior of the target cell through the first and second perforations. At the moment the puncture part pierces the target component, a local short circuit occurs inside the target cell, causing a rapid temperature rise and triggering thermal runaway from the inside out (verified in this embodiment, the instantaneous temperature rise rate dT / dt of the target cell is ≥1℃ / s and lasts for more than 3 seconds without any open flame). Therefore, this embodiment can better trigger localized internal short-circuit thermal runaway, thus better simulating actual battery thermal runaway scenarios.
[0188] It should be noted that the battery thermal runaway triggering method and system of this application embodiment can trigger cells at any location in different battery packs, and can also be implemented in the market to conduct random inspections of battery products. It has the advantages of high flexibility, simple triggering method, and triggering results that are equivalent to actual thermal runaway conditions.
[0189] The implementation methods of each step in the embodiments of this application can be referred to the relevant content in the above embodiments, and will not be repeated here.
[0190] In some embodiments, this application also provides a battery thermal runaway triggering system, which may include a charging and discharging device and a lifting and grasping device.
[0191] The charging and discharging device is used to charge the target cell in the target battery pack to a preset SOC; wherein a first perforation is provided at a first position of the casing of the target battery pack, and a second perforation is provided at a second position of the casing of the target cell; the projection of the first perforation on the casing of the target cell intersects with the second perforation;
[0192] A liftable gripping device is used to control the piercing part of the piercing assembly to pierce the interior of the target battery cell in sequence through the first perforation and the second perforation, and the cap part of the piercing assembly covers the first perforation; wherein the piercing part and the cap part are connected to each other, and the cap part is located at one end of the piercing part in the axial direction.
[0193] In some embodiments, the puncture assembly further includes a first seal disposed on one side of the cap portion; wherein, when the cap portion covers the first perforation, the first seal is located between the cap portion and the first perforation.
[0194] In some embodiments, the length of the puncture portion is greater than the vertical distance between the housing of the target battery pack and the housing of the target cell.
[0195] In some embodiments, the system further includes a guide component; wherein the guide component is positioned between the first perforation and the second perforation to guide the puncture portion to sequentially pass through the first perforation and the second perforation along the extension direction of the guide component and pierce into the interior of the target battery cell.
[0196] In some embodiments, the system further includes a second seal, wherein the second seal is disposed between the guide assembly and the second perforation.
[0197] In some embodiments, a first perforation is provided at a first position of the top cover of the target battery pack, and a second perforation is provided at a second position of the top cover of the target battery cell.
[0198] In some embodiments, the projection of the first perforation onto the housing of the target cell may cover the second perforation.
[0199] In some embodiments, the liftable gripping device includes:
[0200] The gripping component is used to grip the cap of the puncture component;
[0201] A movable component connected to the gripping component is used to move the gripping component toward the housing of the target battery cell, so as to drive the piercing part of the piercing component to pierce into the interior of the target battery cell through the first piercing hole and the second piercing hole in sequence.
[0202] In some embodiments, the moving component includes a drive element and a moving element; wherein the grasping component is connected to the moving element.
[0203] A driving component is used to drive a moving component to move along a first preset direction at a first moving speed, so as to move the gripping assembly toward the housing of the target battery cell.
[0204] In some embodiments, the gripping component is also used to: release the cap portion of the puncture component in the event of thermal runaway of the target cell;
[0205] The moving component is also used to drive the gripping component to move away from the housing of the target battery pack.
[0206] In some embodiments, the drive member is further configured to drive the movable member in the movable assembly to move along a second preset direction at a second moving speed, so as to drive the gripping assembly to move in a direction away from the housing of the target battery pack.
[0207] In some embodiments, the charging and discharging equipment is also used to perform a full discharge process on the target battery cell.
[0208] In some embodiments, the diameter of the puncture site is 0.5 mm to 1 mm.
[0209] In some embodiments, the puncture site is made of any of the following materials: aluminum alloy, copper alloy, or tungsten carbide alloy.
[0210] In some embodiments, the diameter of the first perforation is 3mm to 4mm; and / or,
[0211] The diameter of the second perforation is 1mm~2mm.
[0212] In some embodiments, a temperature acquisition component is provided on the casing of the target cell and on the casing of each cell adjacent to the target cell in the target battery pack.
[0213] Temperature acquisition component, used to acquire the temperature of the corresponding battery cell.
[0214] In this embodiment, the relevant content of each component in the battery thermal runaway triggering system can be referred to the relevant content in the above embodiment of the battery thermal runaway triggering method, and will not be repeated here.
[0215] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.
[0216] Those skilled in the art will understand that all or part of the processes in the above methods can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, the computer program can include the processes of the above methods.
[0217] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 triggering battery thermal runaway, characterized in that, The method includes: Drilling is performed on a first position of the casing of the target battery pack and a second position of the casing of the target battery cell to form a first perforation at the first position and a second perforation at the second position; wherein the target battery cell is located in the target battery pack, and the projection of the first perforation on the casing of the target battery cell intersects with the second perforation; Charge the target battery cell to a preset SOC; The puncture part of the puncture assembly is inserted into the interior of the target battery cell through the first perforation and the second perforation in sequence, and the cap part of the puncture assembly covers the first perforation; wherein the puncture part and the cap part are connected to each other, and the cap part is located at one end of the puncture part in the axial direction.
2. The method according to claim 1, characterized in that, When a guide assembly is placed between the first perforation and the second perforation, the piercing part of the controlled piercing assembly sequentially pierces the interior of the target battery cell through the first perforation and the second perforation, including: The guide assembly guides the puncture part to sequentially penetrate the target cell through the first and second perforations along the extension direction of the guide assembly.
3. The method according to claim 1 or 2, characterized in that, The step of drilling holes at a first location on the casing of the target battery pack and at a second location on the casing of the target battery cell, respectively, to form a first perforation at the first location and a second perforation at the second location, includes: Drilling is performed on a first position of the top cover of the target battery pack and a second position of the top cover of the target battery cell, respectively, to form a first perforation at the first position and a second perforation at the second position.
4. The method according to any one of claims 1-3, characterized in that, The projection of the first perforation onto the casing of the target cell can cover the second perforation.
5. The method according to any one of claims 1-4, characterized in that, The puncture portion of the controlled puncture assembly sequentially punctures the interior of the target battery cell through the first puncture hole and the second puncture hole, including: The cap portion of the puncture component is grasped by the grasping component; The moving component drives the grasping component to move towards the housing of the target battery cell, so that the piercing part of the piercing component can sequentially pierce the interior of the target battery cell through the first piercing hole and the second piercing hole.
6. The method according to claim 5, characterized in that, The step of moving the grasping component towards the housing of the target battery cell via the moving component includes: The moving component in the moving component is driven by the driving component to move along a first preset direction at a first moving speed, so as to move the grasping component toward the casing of the target battery cell.
7. The method according to claim 6, characterized in that, The first moving speed is 1 mm / s to 8 mm / s.
8. The method according to any one of claims 5-7, characterized in that, The method further includes: In the event of thermal runaway of the target battery cell, the gripping component releases the cap of the puncture component; The moving component drives the grasping component to move away from the housing of the target battery pack.
9. The method according to claim 8, characterized in that, The step of moving the grasping component away from the housing of the target battery pack by means of the moving component includes: The moving component in the moving component is driven by a driving element to move along a second preset direction at a second moving speed, thereby causing the grasping component to move in a direction away from the housing of the target battery pack.
10. The method according to claim 9, characterized in that, The second moving speed is 3cm / s to 5cm / s.
11. The method according to any one of claims 1-10, characterized in that, Before the sealing drilling device drills holes at the first position of the target battery pack casing and the second position of the target cell casing, the method further includes: The target battery cell is then fully discharged.
12. A battery thermal runaway triggering system, characterized in that, The system includes: A charging and discharging device is used to charge a target cell in a target battery pack to a preset SOC; wherein, a first perforation is provided at a first position of the housing of the target battery pack, and a second perforation is provided at a second position of the housing of the target cell; the projection of the first perforation on the housing of the target cell intersects with the second perforation; A liftable gripping device is used to control the piercing part of the piercing assembly to pierce the interior of the target battery cell in sequence through the first perforation and the second perforation, and the cap part of the piercing assembly covers the first perforation; wherein the piercing part and the cap part are connected to each other, and the cap part is located at one end of the piercing part in the axial direction.
13. The battery thermal runaway triggering system according to claim 12, characterized in that, The puncture assembly further includes a first seal disposed on one side of the cap portion; wherein, when the cap portion covers the first perforation, the first seal is located between the cap portion and the first perforation.
14. The battery thermal runaway triggering system according to claim 12 or 13, characterized in that, The length of the puncture portion is greater than the vertical distance between the casing of the target battery pack and the casing of the target cell.
15. The battery thermal runaway triggering system according to any one of claims 12-14, characterized in that, The system further includes a guide component; wherein the guide component is positioned between the first perforation and the second perforation to guide the puncture portion to sequentially pass through the first perforation and the second perforation along the extension direction of the guide component and pierce into the interior of the target battery cell.
16. The battery thermal runaway triggering system according to claim 15, characterized in that, The system also includes a second seal, wherein the second seal is positioned between the guide assembly and the second perforation.
17. The battery thermal runaway triggering system according to any one of claims 12-16, characterized in that, The target battery pack has a first perforation at a first position on its top cover, and the target battery cell has a second perforation at a second position on its top cover.
18. The battery thermal runaway triggering system according to any one of claims 12-17, characterized in that, The projection of the first perforation onto the casing of the target cell can cover the second perforation.
19. The battery thermal runaway triggering system according to any one of claims 12-18, characterized in that, The liftable gripping device includes: A gripping component for gripping the cap portion of the puncture component; A movable component connected to the gripping component is used to move the gripping component toward the housing of the target battery cell, so as to drive the piercing part of the piercing component to pierce the interior of the target battery cell through the first piercing hole and the second piercing hole in sequence.
20. The battery thermal runaway triggering system according to claim 19, characterized in that, The moving component includes: a driving component and a moving component; wherein the grasping component is connected to the moving component; The driving component is used to drive the moving component to move along a first preset direction at a first moving speed, so as to drive the gripping component to move towards the casing of the target battery cell.
21. The battery thermal runaway triggering system according to claim 20, characterized in that, The gripping component is also used to: release the cap portion of the puncture component in the event of thermal runaway of the target battery cell; The moving component is also used to drive the grasping component to move away from the housing of the target battery pack.
22. The battery thermal runaway triggering system according to claim 21, characterized in that, The driving component is also used to drive the moving component in the moving assembly to move along a second preset direction at a second moving speed, so as to drive the gripping component to move in a direction away from the housing of the target battery pack.
23. The battery thermal runaway triggering system according to any one of claims 12-22, characterized in that, The charging and discharging device is also used to fully discharge the target battery cell using the housing.
24. The battery thermal runaway triggering system according to any one of claims 12-23, characterized in that, The diameter of the puncture site is 0.5mm to 1mm.
25. The battery thermal runaway triggering system according to any one of claims 12-24, characterized in that, The material of the puncture site is any one of the following: aluminum alloy, copper alloy, or tungsten steel alloy.
26. The battery thermal runaway triggering system according to any one of claims 12-25, characterized in that, The diameter of the first perforation is 3mm~4mm; and / or, The diameter of the second perforation is 1mm to 2mm.
27. The battery thermal runaway triggering system according to any one of claims 12-26, characterized in that, Temperature acquisition components are provided on the casing of the target battery cell and on the casing of each battery cell adjacent to the target battery cell in the target battery pack. The temperature acquisition component is used to acquire the temperature of the corresponding battery cell.