Protective venting assembly, battery pack, and electric device

Abstract

A protective venting assembly (100), a battery pack (200), and an electric device (300). An expansion member (1) is adapted to be arranged opposite to and abut against a battery; at least one accommodating cavity (11) is provided with a protective support member (2), and a venting channel (21) is defined within the protective support member (2); the venting channel (21) is adapted to be communicated with an explosion-proof valve of the battery; and an adjustment member (3) is arranged on the side of the expansion member (1) distant from the battery, and the adjustment member (3) is arranged opposite to and abuts against a side plate of the battery pack (200).

Description

Protective exhaust components, battery packs, and electrical devices.

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202421833772.9, filed by BYD Company Limited on July 30, 2024, entitled “Protective Exhaust Assembly, Battery Pack and Electrical Device”. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a protective venting assembly, a battery pack, and an electrical device. Background Technology

[0004] Thermal runaway problems frequently occur in electrical devices such as new energy vehicles. Thermal runaway can lead to property damage and safety issues. Therefore, how to reduce or avoid thermal runaway and how to prevent battery pack safety problems remain the most important issues for batteries.

[0005] Meanwhile, as the product matrix of new energy vehicles becomes increasingly rich, for example, the same model or series of models generally have multiple range versions. The battery pack capacity of different range versions of vehicles is different, but the size of the mounting position on the vehicle body used to fix the battery pack has been fixed. The battery packs of different range versions need to be platformized to improve versatility. Summary of the Invention

[0006] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a protective venting assembly that can improve the safety of a battery pack and is suitable for platform-based design of battery packs.

[0007] This application also proposes a battery pack having the aforementioned protective venting components.

[0008] This application also proposes an electrical device having the aforementioned battery pack.

[0009] In a first aspect, embodiments of this application propose a protective venting assembly for a battery pack, comprising: an expansion member, a protective support member, and an adjusting member. The expansion member is adapted to be opposite to the battery and is anti-blockingly disposed. At least one receiving cavity is defined within the expansion member. The at least one receiving cavity is provided with the protective support member, and an venting channel is defined within the protective support member. The venting channel is adapted to communicate with the pressure relief valve of the battery. The adjusting member is disposed on the side of the expansion member away from the battery, and the adjusting member is opposite to the side plate of the battery pack and is anti-blockingly disposed.

[0010] According to the protective venting assembly of this application embodiment, by providing a protective support member within the containment cavity, the protective support member can separate the high-temperature gas from the cavity wall when the battery experiences thermal runaway, thereby reducing the risk of the containment cavity being easily damaged by the high-temperature gas during thermal runaway. Simultaneously, the protective support member has better structural strength than the expansion member, so that when the expansion member is subjected to the expansion force of the battery, the deformation of the protective support member is small or essentially non-deformed. The protective support member can provide good support for the expansion member, thereby improving the structural stability of the venting channel and the containment cavity. This ensures that the venting channel remains connected during battery expansion, improving venting smoothness and enhancing the structural stability and load-bearing capacity of the protective venting assembly. It can prevent other batteries from contacting the high-temperature gas and causing more batteries to experience thermal runaway, slowing down the spread of thermal runaway. This allows the battery management system sufficient reaction time to promptly disconnect the battery's power supply, thus improving the safety of the battery pack. On the other hand, by setting up the adjustment member, the protective venting assembly can be platform-based, reducing development costs and improving versatility.

[0011] According to some embodiments of this application, the expansion member extends into a long strip shape, one side of the width of the expansion member is adapted to be disposed opposite to the battery, the receiving cavity extends along the length direction of the expansion member to penetrate both ends of the length of the expansion member, and the adjusting member is disposed on the other side of the width of the expansion member.

[0012] According to some embodiments of this application, there are multiple receiving cavities, which are spaced apart along the height direction and / or width direction of the expansion member, and at least one receiving cavity is provided with a protective support member.

[0013] According to some embodiments of this application, the receiving cavity includes at least one support receiving cavity and at least one partition receiving cavity, wherein a protective support is disposed in the support receiving cavity and a partition is disposed in the partition receiving cavity.

[0014] According to some embodiments of this application, the extending direction of the partition is at an angle to the extending direction of the protective support.

[0015] According to some embodiments of this application, a guide portion is provided at one end of the height of the adjusting member, and it is adapted to guide the adjusting member during assembly into the battery pack.

[0016] According to some embodiments of this application, the adjusting member is provided with reinforcing ribs on the side opposite to the expanding member, and the reinforcing ribs are in the form of a grid.

[0017] According to some embodiments of this application, the width side of the receiving cavity is open, a protective support member is disposed in the receiving cavity, and a limiting part that cooperates with the protective support member is provided on the open side of the receiving cavity.

[0018] According to some embodiments of this application, the exhaust protection assembly further includes: a fixing structure for fixing the wiring harness and the sensor; the receiving cavity further includes: at least one fixing structure receiving cavity, the fixing structure being disposed in the fixing structure receiving cavity, and the wiring harness being electrically connected to the battery; the sensor being used to measure the battery's operating signal.

[0019] According to some embodiments of this application, the adjusting member is provided with a first connecting portion, and the expanding member is provided with a second connecting portion that mates with the first connecting portion, so that the adjusting member and the expanding member are detachably connected.

[0020] According to some embodiments of this application, the exhaust protection assembly further includes: a diaphragm, with one side of the receiving cavity open, and the diaphragm is disposed at least between the protective support and the bottom wall opposite the open side of the receiving cavity.

[0021] According to some embodiments of this application, the diaphragm is constructed of mica.

[0022] According to some embodiments of this application, at least one set of limiting structures are provided on both sides of the height of the expansion member, and the limiting structures are suitable for positioning the heating diaphragm and the limiting strip.

[0023] According to some embodiments of this application, multiple sets of limiting structures are arranged sequentially along the length of the expansion member to facilitate positioning of heating films and limiting strips of different sizes.

[0024] According to some embodiments of this application, the limiting structure is constructed as one or more of the following: limiting groove, limiting protrusion, and limiting hole.

[0025] Secondly, embodiments of this application propose a battery pack, including: a tray, a battery, a protective venting assembly, and a spacer beam. The tray defines an accommodating space, and both the protective venting assembly and the battery are disposed within the accommodating space. The spacer beam is disposed within the tray, and a communicating channel is formed within the spacer beam, connecting the venting channel and the explosion-proof valve.

[0026] According to some embodiments of this application, a partition plate is provided inside the partition beam, and the partition plate divides the connecting channel into a first sub-channel and a second sub-channel that extend along the length direction of the partition beam and are spaced apart. A battery and a protective exhaust assembly are provided on both sides of the width of the partition beam, and the two protective exhaust assemblies located on both sides of the width of the partition beam are respectively connected to the first sub-channel and the second sub-channel.

[0027] According to some embodiments of this application, there are two explosion-proof valves, which are disposed on a tray and located at both ends of the length of the spacer beam, and are respectively connected to the first sub-channel and the second sub-channel.

[0028] According to some embodiments of this application, the explosion-proof valve cover is provided with a flow guide, and the flow guide outlet of the flow guide extends to the bottom edge of the tray.

[0029] Thirdly, embodiments of this application provide an electrical device including the aforementioned battery pack.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 is a schematic diagram of a battery pack from one angle according to an embodiment of this application;

[0033] Figure 2 is a schematic diagram of the battery pack according to an embodiment of this application from another angle;

[0034] Figure 3 is a schematic diagram of an exhaust protection assembly according to an embodiment of this application;

[0035] Figure 4 is a split schematic diagram of the exhaust protection assembly according to an embodiment of this application;

[0036] Figure 5 is a cross-sectional schematic diagram of an exhaust protection assembly according to an embodiment of this application;

[0037] Figure 6 is a schematic diagram of the cooperation between the expansion member and the protective support member according to an embodiment of this application;

[0038] Figure 7 is a cross-sectional schematic diagram of the expansion member and the protective support member according to an embodiment of this application;

[0039] Figure 8 is a schematic diagram of an exhaust protection assembly according to an embodiment of this application from one angle;

[0040] Figure 9 is a schematic diagram of the exhaust protection assembly according to an embodiment of this application from another angle;

[0041] Figure 10 is a schematic diagram of the first limiting structure and the second limiting structure according to an embodiment of this application;

[0042] Figure 11 is a schematic diagram of the third limiting structure according to an embodiment of this application;

[0043] Figure 12 is a schematic diagram of a tray at one angle according to an embodiment of the present application;

[0044] Figure 13 is a schematic diagram of the tray from another angle according to an embodiment of this application;

[0045] Figure 14 is a partial cross-sectional schematic diagram of a tray according to an embodiment of the present application;

[0046] Figure 15 is a schematic diagram of an electrical device according to an embodiment of this application. Detailed Implementation

[0047] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0048] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0050] Hereinafter, with reference to the accompanying drawings, a protective exhaust assembly 100 according to an embodiment of the present application will be described.

[0051] As shown in Figures 1 and 2, this application embodiment proposes a protective venting assembly 100, which is used in a battery pack 200.

[0052] As shown in Figures 3, 4, and 5, the protective venting assembly 100 includes an expansion member 11, a protective support member 2, and an adjusting member 3. The expansion member 11 is adapted to be opposite to and abut against the battery so that it can at least withstand the expansion force of the battery. This allows the expansion member 11 to absorb the battery's expansion, reduce the compressive force on the battery, and provide a certain degree of support and protection. Thus, the expansion member 11 can adaptively absorb the battery's expansion force to improve battery safety.

[0053] The expansion member 11 can absorb a certain amount of impact energy. When the side of the battery pack 200 equipped with the protective exhaust component 100 is impacted, the impact energy can be absorbed through the expansion member 11, thereby reducing the deformation of the battery and protecting the battery.

[0054] The expansion component 11 can be a non-metallic component, such as a rubber component or a plastic component.

[0055] The expansion member 11 defines at least one receiving cavity, the at least one receiving cavity is provided with a protective support member 2, and the protective support member 2 defines an exhaust passage 21. The exhaust passage 21 is adapted to communicate with the pressure relief valve of the battery. The exhaust passage 21 can be connected to the outside of the battery pack 200 so that when the battery experiences thermal runaway, the battery can discharge high-temperature emission substances (high-temperature gas flow) through the pressure relief valve. The emission substances can be discharged to the outside of the battery pack 200 through the exhaust passage 21.

[0056] Therefore, by setting a protective support 2 inside the containment cavity, in the event of thermal runaway, the protective support 2 can separate the high-temperature gas from the cavity wall, preventing the high-temperature gas from contacting the cavity wall. This reduces the risk of the containment cavity being easily damaged by the high-temperature gas during thermal runaway, and improves the flexibility of material selection for the expansion component 11. Simultaneously, the protective support 2 has better structural strength than the expansion component 11, so that when the expansion component 11 is subjected to the expansion force of the battery, the deformation of the protective support 2 is small or virtually non-deformed. The protective support 2 can provide good support for the expansion component 11, improving the structural stability of the exhaust channel 21 and the containment cavity, facilitating the process during battery thermal runaway. During thermal runaway, the exhaust channel 21 remains connected, improving exhaust flow and stability. This reduces the risk of blockage caused by the battery expanding and flattening the exhaust channel 21. It also enhances the structural stability and load-bearing capacity of the protective exhaust assembly 100, allowing high-temperature gases generated during thermal runaway to be promptly discharged from the battery pack 200 through the exhaust channel 21. This prevents other batteries from coming into contact with the high-temperature gases and causing further thermal runaway, slowing the spread of thermal runaway. This gives the battery management system (BMS) sufficient reaction time to promptly disconnect the battery's power supply, thereby improving the safety of the battery pack 200.

[0057] The protective support 2 can reduce the risk of the expansion component 11 being crushed by the battery expansion force to a certain extent, thus improving the reliability of the protective venting assembly 100.

[0058] The expansion member 11 defines a receiving cavity, which is provided with a protective support member 2; when the expansion member 11 defines multiple receiving cavities, at least one of the multiple receiving cavities is provided with a protective support member 2.

[0059] The cross-sectional shape of the cavity is not limited; for example, the cross-sectional shape of the cavity can be circular, elliptical, or square.

[0060] When there are multiple accommodating cavities, there are no specific restrictions on the arrangement of the multiple accommodating cavities; regardless of whether there is one or multiple accommodating cavities, the position of a single accommodating cavity is not limited. For example, in the height direction of the expansion member 11 (e.g., the vertical direction in the figure), the accommodating cavity can be located at the end or middle of the expansion member 11, etc. In the width direction of the expansion member 11 (e.g., the horizontal direction in the figure), the accommodating cavity can be located at the end or middle of the expansion member 11, etc.

[0061] On the side of the expansion member 11 away from the battery, an adjustment member 3 can be further provided. The adjustment member 3 can fill the gap between the expansion member 11 and the side plate of the battery pack 200 (such as the tray 101, the side plate of the box) on the back side of the expansion member 11 (i.e. the side away from the battery). This improves the stability and reliability of the protective exhaust assembly 100 in the battery pack 200, so that the expansion member 11 can be stably and reliably pushed against the battery, effectively pushing the battery, and in the event of thermal runaway, timely exhaust and pressure relief can be provided to reduce the spread rate of thermal runaway.

[0062] The adjusting member 3 is suitable for filling the gap between the expansion member 11 and the side plate of the battery pack 200. If an elastic adjusting member 3 is selected, or if the adjusting member 3 is set to multiple sizes and one is selected for use, the expansion member 11 and the protective support member 2 can be constructed as universal parts that are universal across multiple platforms. The adjustable adjusting member 3 or the interchangeable adjusting members 3 of multiple sizes can make the exhaust protection assembly 100 of this application applicable to various battery packs 200 and batteries of different specifications and sizes, which can improve and reduce development costs and improve versatility.

[0063] According to the protective exhaust assembly 100 of this application embodiment, on the one hand, by providing a protective support 2 inside the receiving cavity, the protective support 2 can separate the high-temperature gas from the cavity wall when the battery experiences thermal runaway, thereby reducing the risk that the receiving cavity is easily damaged by the high-temperature gas during thermal runaway; on the other hand, the protective support 2 has good structural strength relative to the expansion member 11, so that when the expansion member 11 is subjected to the expansion force of the battery, the deformation of the protective support 2 is small or basically non-deformed, and the protective support 2 can provide good support for the expansion member 11, thereby improving the structure of the exhaust channel 21 and the receiving cavity. Stability ensures that the venting channel 21 remains connected when the battery expands, improving venting smoothness and enhancing the structural stability and load-bearing capacity of the protective venting assembly 100. This prevents other batteries from coming into contact with high-temperature gases and causing more batteries to experience thermal runaway, slowing down the spread of thermal runaway. It also gives the battery management system sufficient reaction time to promptly cut off the battery's power supply, thereby improving the safety of the battery pack 200. On the other hand, the adjustment component 3 allows for a platform-based design of the protective venting assembly 100, reducing development costs and improving versatility.

[0064] As the product matrix of new energy vehicles becomes increasingly rich, for example, the same model or series of models generally have multiple range versions. The battery pack capacity of different range versions of vehicles is different, but the size of the mounting position on the vehicle body used to fix the battery pack has been fixed. However, the battery packs of different range versions need to be platformized to improve versatility.

[0065] This application further makes the adjustment member 3 a variety of types, and the various adjustment members 3 have different dimensions in the width direction, so that one or more of the adjustment members 3 can be selected to adapt to batteries and battery packs of different specifications.

[0066] For a battery pack 200 of the same specification, the specifications of the batteries inside the battery pack 200 may differ depending on the usage scenario. When batteries of different sizes are used, the gap between the battery and the side plate varies. By selecting an adjusting member 3 of appropriate width, multiple batteries of different sizes can be fixed within the same battery pack 200, achieving platformization of the battery pack 200 and reducing costs. Furthermore, for battery packs 200 of different specifications, the protective venting assembly 100 of this application embodiment can be used. By selecting a suitable adjusting member 3, the protective venting assembly 100 can stably and reliably stop the batteries within the battery pack 200 and achieve thermal runaway emission protection. In other words, the adjusting member 3 enhances the adaptability of the protective venting assembly 100, enabling universal compatibility between multiple battery packs 200 on the same platform and matching multiple battery packs 200 of different specifications.

[0067] The expansion member 11 and the protective support member 2 can be constructed as universal components. When multiple batteries are used in the same battery pack, the expansion member 11 and the protective support member 2 can be reused by selecting adjustment members 3 of different sizes. When different battery packs have different battery sizes, adjustment members 3 of different sizes can also be selected to improve the adaptability of the exhaust protection component 100 and make the expansion member 11 and the protective support member 2 of this application embodiment more universal.

[0068] The adjusting component 3 can be of various types, so that the expansion component 11 and the protective support component 2 can be constructed as universal components. Furthermore, the adjusting component 3 of appropriate thickness can be selected according to the gap between the battery and the side plate of the battery pack 200, so as to realize the platform setting of the protective exhaust component 100, reduce development costs, and improve versatility.

[0069] The expansion component 11 and the protective support component 2 can be universalized, and a suitable adjustment component 3 can be selected. This can reduce the number of molds, reduce mold opening costs, reduce the types of materials on the production line, reduce the risk of material mixing when producing battery packs 200 on the same platform and on the same line, and improve processing efficiency and accuracy.

[0070] The overall exhaust solution can be designed on a platform. The exhaust performance of different products can be determined by making minor custom modifications to the standardized design to find the patterns. The results of thermal diffusion tests can be quantitatively analyzed, which is predictive and referential for risk assessment of subsequent platform projects. It eliminates the need to re-verify the solution each time, shortens the testing cycle, and reduces testing costs.

[0071] In this embodiment, the length direction corresponds to the X direction in the accompanying drawings, the width direction corresponds to the Y direction in the accompanying drawings, and the height direction corresponds to the Z direction in the accompanying drawings.

[0072] In some embodiments, as shown in Figures 6 and 7, the expansion member 11 extends into a long strip shape, and one side of the expansion member 11 is adapted to be positioned opposite the battery. When the battery expands, the battery can squeeze the expansion member 11 along the width direction of the expansion member 11 (e.g., the Y direction in Figure 4). The receiving cavity extends along the length direction of the expansion member 11 to both ends of the length of the expansion member 11, which helps to simplify the assembly of the protective support member 2 and the expansion member 11. At the same time, it is convenient for the receiving cavity to have sufficient length to set the protective support member 2, so that the protective support member 2 can adapt to the size of the battery and the position of the pressure relief valve, so that the exhaust channel 21 is adapted to communicate with the pressure relief valve of the battery, and high-temperature gas can be discharged from the battery through the exhaust channel 21 in the event of thermal runaway.

[0073] When the number of cavities is greater than the number of protective supports 2, the cavities are adapted to be connected to the pressure relief valve of the battery and to the outside of the battery pack 200. The cavities without protective supports 2 can also be used as exhaust cavities to guide the battery's emissions from one end of the cavities to the other end so as to discharge them from the battery pack 200.

[0074] The adjusting member 3 is located on the other side of the expansion member 11, which can push the expansion member 11 to make the gap between the expansion member 11 and the exhaust channel 21 in the battery pack 200 smaller, thereby improving the exhaust effect and exhaust efficiency.

[0075] In some embodiments, as shown in Figures 5, 6 and 7, there are multiple accommodating cavities, which are spaced apart along the height and / or width direction of the expansion member 11, and at least one accommodating cavity is provided with a protective support member 2.

[0076] At least one of the multiple cavities is provided with a protective support 2. If the number of cavities with protective support 2 is less than the total number of cavities, the high-temperature gas during battery thermal runaway can be discharged through at least one cavity and at least one exhaust channel 21. If each cavity is provided with a protective support 2, the high-temperature gas during battery thermal runaway can be discharged through multiple exhaust channels 21.

[0077] When the number of cavities with protective support members 2 is less than the total number of cavities, even if the expansion member 11 is blocked due to the deformation of the cavities without protective support members 2 caused by the expansion force of the battery, high-temperature gas can still be discharged through the exhaust channel 21, thereby improving the safety of the battery pack 200.

[0078] The receiving cavity includes: at least one support member receiving cavity and at least one partition receiving cavity, wherein a protective support member 2 is disposed in the support member receiving cavity and a partition 111 is disposed in the partition receiving cavity.

[0079] Among the multiple receiving cavities, there may be at least one partition receiving cavity and at least one support receiving cavity. In addition to the receiving cavity provided with the protective support 2, the other receiving cavities may be further provided with partitions 111, so that the support within the receiving cavity can be achieved through the partitions 111, thereby improving the structural strength of the expansion member 11, reducing the deformation of the expansion member 11, reducing the probability of deformation in the receiving cavity without the protective support 2, reducing the deformation and displacement of the expansion member 11, so as to make the connection stability between the exhaust channel 21 and the protective support 2 higher and the exhaust reliability higher.

[0080] The expansion member 11 defines three accommodating cavities arranged sequentially along the height direction. The first and third accommodating cavities are constructed as partition accommodating cavities, with partitions 111 disposed inside. The second accommodating cavity (i.e., the middle accommodating cavity) is constructed as a support accommodating cavity, with a protective support 2 disposed inside. The two partition accommodating cavities located on both sides of the support accommodating cavity can further improve the structural strength of the expansion member 11 and reduce the probability of deformation of the accommodating cavity after being squeezed, especially reducing the probability of deformation of the support accommodating cavity, so that the exhaust channel 21 can exhaust gas stably and reliably.

[0081] In some embodiments, as shown in Figures 4 and 6, the extending direction of the partition 111 forms an angle with the extending direction of the protective support 2.

[0082] The protective support 2 can extend along the length of the expansion member 11, while the partition 111, located in the receiving cavity, can extend along the width and height directions. By using the partition 111, which has an angle with the protective support 2, the structural strength of the expansion member 11 can be improved, and the protective support 2 can be supported and limited on both sides of its height, reducing the probability of deformation of the protective support 2 when the expansion beam is deformed by heat.

[0083] In some embodiments, as shown in Figures 4 and 5, a guide portion 31 is provided at one end of the height of the adjusting member 3, and is adapted to provide assembly guidance when the adjusting member 3 is assembled to the battery pack 200.

[0084] To improve the stability of the protective venting assembly 100 within the battery pack 200 and enhance the clamping and securing effect on the battery, the gap between the side plate of the battery pack 200 and the battery can be equal to or slightly smaller than the width of the protective venting assembly 100, such as a gap of 15mm, while the width of the protective venting assembly 100 is 15mm or 16mm, to achieve a slight interference fit or a gapless fit.

[0085] This application provides a guide part 31 at one end of the height of the adjusting part 3. For example, if the assembly is from top to bottom, the guide part 31 is located at the lower end; if the assembly is from bottom to top, the guide part 31 is located at the lower end. The projection profile of the guide part 31 in the length direction can be an inclined plane. In the area where the guide part 31 is located, the width of the adjusting part 3 in the assembly direction gradually increases, so that the end with the smaller cross-sectional width is prioritized for assembly, thereby achieving the assembly guiding effect, reducing the assembly difficulty and improving the assembly accuracy.

[0086] In some embodiments, as shown in FIG4, the adjusting member 3 is provided with a reinforcing rib 32 on the side opposite to the expanding member 11, and the reinforcing rib 32 is in the form of a grid.

[0087] The reinforcing rib 32 may include a first reinforcing rib 32 extending along a first direction and a second reinforcing rib 32 extending along a second direction. The first direction may be any direction such as the length direction, width direction, or height direction, and the second direction may also be any direction among the length direction, width direction, and height direction. The first direction and the second direction have an angle, so that the first reinforcing rib 32 and the second reinforcing rib 32 are staggered to define a grid structure, improve the structural strength of the adjusting member 3, reduce the collapse of the adjusting member 3 after being subjected to pressure, and enable the protective exhaust assembly 100 to withstand greater pressure and have a certain impact resistance, thereby improving the protection effect on the battery.

[0088] The reinforcing rib 32 on the adjusting member 3 in this embodiment is not limited to this configuration. In other embodiments, the reinforcement can be defined as a honeycomb structure, which includes multiple cavities, and the periphery of each cavity is enclosed in a prism or pyramid shape. This can improve the structural strength of the adjusting member 3, allowing it to withstand more expansion forces. This helps reduce the risk of damage to the protective venting assembly 100 under the expansion forces of the battery. Simultaneously, it allows the venting protective assembly to withstand more impact energy, reducing impact damage to the battery and thus improving battery safety.

[0089] For a single cavity, the shape formed by the perimeter walls of the cavity is either prism or pyramid. It is understood that the shapes formed by the perimeter walls of multiple cavities can be the same or different. For example, the perimeter walls of all cavities can form a hexagonal prism; or, for another example, the perimeter walls of at least one of the multiple cavities can form a hexagonal prism, while the perimeter walls of at least one of the remaining cavities can form a square prism.

[0090] In some embodiments, the protective support 2 has better resistance to deformation than the expansion member 11; and / or, the protective support 2 has better resistance to high temperatures than the expansion member 11.

[0091] The protective support 2 has better resistance to deformation than the expansion member 11. Therefore, the protective support 2 can be installed in the cavity to improve the structural strength of the cavity, so that the exhaust channel 21 can withstand greater battery expansion force and improve the structural stability of the exhaust channel 21. This allows the exhaust channel 21 to remain connected to discharge high-temperature gas during battery thermal runaway, thereby improving the safety of the battery pack 200.

[0092] In some examples, the high-temperature resistance of the protective support 2 is better than that of the expansion member 11. Therefore, the protective support 2 is provided in the cavity to improve the high-temperature resistance of the cavity, so that the exhaust channel 21 can withstand the high-temperature gas and prevent the high-temperature gas from damaging the cavity (e.g., melting). This can improve the performance of the protective support component, enhance the stability of the exhaust channel 21 and the stability of the exhaust efficiency, and help slow down the rate of battery thermal runaway. This allows the battery management system to have a suitable reaction time to cut off the battery power, thereby improving the safety of the battery pack 200.

[0093] In some embodiments, both the expansion member 11 and the adjustment member 3 are plastic parts, so that the expansion member 11 can better absorb the expansion force of the battery to adapt to the expansion of the battery, reduce the squeezing force on the battery, and play a role in protecting the battery; the protective support member 2 can be a metal part, a ceramic part, a composite material part, or a mica part, so that the protective support member 2 has suitable structural strength and high temperature resistance. In addition, the protective support member 2 has a variety of options to adapt to the needs of the battery structure and the protective venting assembly 100 to select suitable materials and improve the safety of the battery pack 200.

[0094] In embodiments where the protective support 2 is constructed of metal, the protective exhaust assembly 100 further includes a diaphragm 4, with one side of the receiving cavity open, and the diaphragm 4 is disposed at least between the protective support 2 and the bottom wall opposite the open side of the receiving cavity.

[0095] The bottom wall of the receiving cavity refers to the side wall of the expansion member 11 opposite to the battery, that is, the side wall opposite to the open side. The diaphragm 4 is provided on this side to achieve insulation protection for the protective support member 2, which is constructed of metal, thereby improving the safety and reliability of the battery pack 200.

[0096] In some embodiments, the diaphragm 4 may be constructed as a mica element and is located inside the receiving cavity, and may separate the protective support 2 from the expansion member 11 to achieve good insulation protection.

[0097] The material of the diaphragm 4 is not limited to mica, but can also be other polymer materials or composite materials with good insulation, high temperature resistance and corrosion resistance.

[0098] As shown in Figure 4, in order to ensure that the diaphragm 4 can effectively separate the protective support 2, the diaphragm 4 may include a first membrane and a second membrane located on both sides of the height of the first membrane, which are attached to the side surface of the protective support 2 facing the battery. The second membrane is attached to at least part of the height sides of the protective support 2 to improve the insulation and protection effect.

[0099] As shown in Figures 5, 6 and 7, the width of the receiving cavity is open, the protective support 2 is disposed in the receiving cavity, and the open side of the receiving cavity is provided with a limiting part 12 that cooperates with the protective support 2.

[0100] The protective support 2 can be inserted into the receiving cavity from the left and right ends of the expansion member 11, or it can be assembled into the receiving cavity from the open side. The open side is provided with a limiting part 12, which can limit the protective support 2 to improve the fixing stability of the protective support 2 and reduce the assembly difficulty between the expansion member 11 and the protective support 2.

[0101] The limiting part 12 can be configured as a limiting buckle, and the limiting buckles are arranged in pairs. Each pair of limiting buckles is arranged opposite to each other in the height direction, and multiple pairs of limiting buckles are spaced apart in the length direction. The buckle of each pair of limiting buckles is formed with an inclined surface and a pushing surface. The inclined surface is suitable for assembly guidance so that the protective support 2 can enter the receiving cavity, while the pushing surface is suitable for pushing and limiting the protective support 2 in the width direction.

[0102] As shown in Figures 6 and 7, the protective exhaust assembly 100 further includes a fixing structure, and the receiving cavity further includes at least one fixing structure receiving cavity. The fixing structure is used to fix the wiring harness and the sensor, and the fixing structure is disposed in the fixing structure receiving cavity. The wiring harness is electrically connected to the battery, and the sensor is used to measure the battery's operating signal.

[0103] The wiring harness can be configured to be electrically connected to the battery, or it can be configured as a data acquisition harness or a power supply harness for a sensor. The sensor can be one or more of a power sensor, a current sensor, and a temperature sensor to measure different operating signals of the battery, such as voltage signals, current signals, and temperature signals. One of the multiple receiving cavities can be formed as a fixed structure receiving cavity. The fixed structure can be set in the fixed structure receiving cavity. The fixed structure can include two baffles arranged opposite each other and a limiting plate located at one end of the width of one baffle. The two baffles define the wiring space. The wiring harness can be set in the wiring space and limited by the limiting plate. The sensor can be located at the end of the wiring harness, passing through the wiring space, and can extend out of the expansion member 11 to be set adjacent to the battery.

[0104] The expansion member 11 defines three accommodating cavities arranged sequentially along the height direction. From top to bottom, the first accommodating cavity is constructed as a partition accommodating cavity, which contains a partition 111. The second accommodating cavity (i.e., the middle accommodating cavity) is constructed as a support accommodating cavity, which contains a protective support 2. The third accommodating cavity is constructed as a fixed structure accommodating cavity, which contains a fixed structure and fixes the wiring harness and sensor through the fixed structure.

[0105] Referring to Figures 4, 5, 6 and 7, the adjusting member 3 is provided with a first connecting part 33, and the expanding member 11 is provided with a second connecting part 13 that cooperates with the first connecting part 33, so that the adjusting member 3 and the expanding member 11 are detachably connected.

[0106] The first connecting part 33 and the second connecting part 13 are provided in a one-to-one correspondence. The adjusting member 3 may be provided with a plurality of first connecting parts 33 in the length direction. The plurality of first connecting parts 33 are provided at intervals, and at least at the end and the middle region of the adjusting member 3 are provided with first connecting parts 33. The expanding member 11 may be provided with a plurality of second connecting parts 13 in the length direction. The plurality of second connecting parts 13 are provided at intervals, and at least at the end and the middle region of the expanding member 11 are provided with second connecting parts 13.

[0107] The first connecting part 33 is configured as a snap-fit, and the second connecting part 13 is configured as a snap-hole, or the first connecting part 33 is configured as a snap-hole and the second connecting part 13 is configured as a snap-fit, so that the adjusting part 3 and the expanding part 11 can be detachably connected through the snap-fit ​​cooperation of the first connecting part 33 and the second connecting part 13, reducing the assembly difficulty between the adjusting part 3 and the expanding part 11, and avoiding the phenomenon of the adjusting part 3 tilting relative to the expanding part 11, thereby improving the connection stability.

[0108] As shown in Figures 8 and 9, at least one set of limiting structures 14 are provided on both sides of the height of the expansion member 11. The limiting structures 14 are suitable for positioning the heating diaphragm and the limiting strip.

[0109] Multiple sets of limiting structures 14 are arranged sequentially along the length of the expansion member 11 to facilitate positioning of heating films and limiting strips of different sizes.

[0110] Multiple sets of limiting structures 14 can be provided on both sides of the height. Each set of limiting structures 14 can be used to limit a component fixed on the protective exhaust assembly 100. Multiple sets of limiting structures 14 can limit multiple components or limit the same component fixed in multiple areas on the protective exhaust assembly 100.

[0111] Two limiting strips are provided on the expansion member 11, and are respectively provided at both ends of the expansion member 11. Limiting structures 14 for fixing the limiting strips can be provided at both ends of the expansion member 11. The heating film can heat the battery. Multiple heating films are connected in series. Two, three or more heating films connected in series can be provided on the expansion member 11 at the same time. Correspondingly, multiple limiting structures 14 are provided on the expansion member 11. The multiple limiting structures 14 are spaced apart in the length direction and are all used to limit the heating film.

[0112] Referring to Figures 10 and 11, the heating film and the limiting strip are positioned differently in battery packs 200 of different specifications. The expansion member 11 of this application can be provided with a variety of limiting structures 14, such as a first limiting structure 141, a second limiting structure 142 and a third limiting structure 143, to limit the components that need to be set at different positions on the expansion member 11. For example, the first limiting structure 141 can limit the first type of limiting strip, and the second limiting structure 142 can limit the second type of limiting strip, etc.

[0113] In this way, the exhaust protection component of this application embodiment can be adapted to fix and limit the components such as limiting rubber strips and heating films of various battery pack 200 items.

[0114] Meanwhile, since other components of the module, such as heating films, limiting strips, and temperature sensors, rely on the limiting structure 14 on the adjusting component 3 for feature positioning, all possible positioning features within the platform are integrated on the adjusting component 3 with the same or different limiting structures 14 at the beginning of the design. This not only shortens the design cycle and simplifies the design personnel, but also allows for overall control of the risk and reliability of the exhaust channels 21 of all projects from the platform perspective. In addition, if a new project is required, the mold can be modified to make a new positioning groove. Theoretically, the same side plate can be used for battery pack 200 projects with the same cell platform (same battery size).

[0115] The limiting structure 14 is constructed as one or more of the following: limiting groove, limiting protrusion, and limiting hole.

[0116] As shown in Figures 2, 12, 13 and 14, the battery pack 200 according to the second aspect of this application includes a tray 101, a battery and a protective venting assembly 100, and a spacer beam 103.

[0117] The tray 101 defines a receiving space, and an explosion-proof valve is provided on the tray 101. The protective exhaust assembly 100 is the protective exhaust assembly 100 according to the first aspect embodiment of this application. The protective exhaust assembly 100 and the battery are both provided in the receiving space. The spacer beam 103 is provided in the tray 101, and a connecting channel 102 is formed in the spacer beam 103. The connecting channel 102 connects the exhaust channel and the explosion-proof valve.

[0118] The battery's pressure relief valve is connected to the exhaust channel 21. When the battery experiences thermal runaway, the pressure relief valve opens and exhausts gas to the exhaust channel 21. The exhaust channel 21 is connected to the connecting channel 102, which is connected to the explosion-proof valve. This allows the high-temperature, high-pressure gas flow (gas-liquid mixture, gas-liquid-solid mixture, etc.) generated by the battery's thermal runaway to be discharged through the exhaust path consisting of the pressure relief valve, the exhaust channel 21, the connecting channel 102, and the expansion valve.

[0119] The battery pack 200 according to the embodiments of this application can improve its safety by adopting the above-described protective venting assembly 100.

[0120] In some embodiments, the tray 101 may be integrally formed with the protective support 2, while the expansion member 11 and the adjustment member 3 clamp the protective support 2.

[0121] Referring to Figures 12, 13 and 14, a partition plate 104 is provided inside the partition beam 103. The partition plate 104 divides the connecting channel 102 into a first sub-channel 1021 and a second sub-channel 1022 that extend along the length of the partition beam 103 and are separated from each other. Batteries and protective exhaust components are provided on both sides of the width of the partition beam 103, and the two protective exhaust components 100 located on both sides of the width of the partition beam 103 are connected to the first sub-channel 1021 and the second sub-channel 1022, respectively.

[0122] The batteries in tray 101 can be placed in groups or modules, and a spacer beam 103 is provided between two adjacent groups or two battery modules to separate the adjacent battery groups or battery modules. A spacer plate 104 is provided inside the spacer beam 103, and the spacer plate 104 can divide the connecting channel 102 into two sub-channels, namely the first sub-channel 1021 and the second sub-channel 1022. When the battery group or battery module located on one side of the width of the spacer beam 103 experiences thermal runaway, the generated high-temperature gas can be discharged into the first sub-channel 1021 through the corresponding exhaust channel 21, and then discharged from the battery pack through the explosion-proof valve corresponding to the first sub-channel 1021. When the battery group or battery module located on the other side of the width of the spacer beam 103 experiences thermal runaway, the generated high-temperature gas can be discharged into the second sub-channel 1022 through the corresponding exhaust channel 21, and then discharged from the battery pack through the explosion-proof valve corresponding to the second sub-channel 1022.

[0123] Therefore, the spacer 104 defines two spaced exhaust paths between two adjacent battery packs or battery modules. The two exhaust paths correspond to the two battery packs or battery modules respectively, so that the exhaust paths are spaced apart. This prevents high-temperature gas from acting on the other battery pack or battery module through the exhaust channel 21 or the connecting channel 102 when one battery pack or battery module experiences thermal runaway. This further reduces the thermal runaway propagation rate of the battery pack, effectively delays the thermal runaway propagation, and improves the safety of the battery pack.

[0124] It is understandable that there are two explosion-proof valves, which are installed on the tray 101 and located at both ends of the length of the spacer beam 103, and are respectively connected to the first sub-channel 1021 and the second sub-channel 1022.

[0125] As shown in Figures 12 and 13, the explosion-proof valve cover is provided with a flow guide shroud 105, and the flow guide outlet of the flow guide shroud 105 extends to the bottom edge of the tray 101.

[0126] Extending the flow outlet to the bottom edge of the tray 101 means that the flow outlet is flush with or slightly protrudes from the bottom edge of the tray 101 in the height direction. This allows the high-temperature gas discharged from the flow hood 105 to be discharged towards the ground or towards the bottom of the battery pack, rather than towards the periphery of the battery pack. This reduces the probability of the high-temperature gas acting on the components around the battery pack and reduces the impact of the high-temperature gas discharge on the surrounding components, thereby further improving safety.

[0127] In embodiments where the battery pack is used in a vehicle, the battery pack is installed in the vehicle chassis. In the event of thermal runaway, the exhaust gas is directly directed toward the ground, which can effectively reduce the probability of high-temperature gas causing damage or even combustion to components located around the battery pack. This can further slow down the spread of thermal runaway and improve vehicle safety.

[0128] The electrical device 300 according to the third aspect of this application includes the battery pack 200 according to the second aspect of this application described above.

[0129] The electrical device 300 according to the embodiments of this application can improve its safety by using the battery pack 200 described above.

[0130] The electrical device 300 can be, but is not limited to, a vehicle or an energy storage device; the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. The vehicle is equipped with a battery pack 200, which can be located at the bottom, front, or rear of the vehicle. The battery pack 200 can be used to supply power to the vehicle; for example, the battery pack 200 can serve as the vehicle's operating power source. In some embodiments of this application, the battery pack 200 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0131] As shown in Figure 15, in some embodiments, the power supply device 300 is equipped with a drive motor 310 and a motor controller 320, and the battery pack 200 is used to supply power to the drive motor 310 and the motor controller 320. The motor controller 320 is used to control the drive motor 310, and the drive motor 310 is used to output driving force.

[0132] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0133] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A guard exhaust assembly, wherein, The protection exhaust assembly is used for a battery pack and comprises: an expansion member (11) adapted to be arranged opposite to and abutting against a battery, at least one accommodating cavity being defined in the expansion member (11); a protection support member (2) provided in at least one of the accommodating cavities and defining an exhaust passage (21) in the protection support member (2), the exhaust passage (21) being adapted to communicate with a pressure relief valve of the battery; an adjusting member (3) provided on a side of the expansion member (11) away from the battery and arranged opposite to and abutting against a side plate of the battery pack.

2. The guard exhaust assembly of claim 1, wherein, The expansion member (11) is elongated, one side of the expansion member (11) in width is adapted to be arranged opposite to the battery, the accommodating cavities extend along a length direction of the expansion member (11) to both ends of the expansion member (11) in length, and the adjusting member (3) is provided on the other side of the expansion member (11) in width.

3. The guard exhaust assembly of claim 2, wherein, A plurality of the accommodating cavities are arranged at intervals along a height direction and / or a width direction of the expansion member (11), and at least one of the accommodating cavities is provided with the protection support member (2).

4. The guard exhaust assembly of any one of claims 1-3, wherein, The accommodating cavities comprise at least one support member accommodating cavity provided with the protection support member (2) and at least one partition plate accommodating cavity provided with a partition plate (111).

5. The guard exhaust assembly of claim 4, wherein, The partition plate (111) extends at an angle to the protection support member (2).

6. The guard exhaust assembly of any of claims 1-5, wherein, One end of the adjusting member (3) in height is provided with a guide portion (31) adapted to guide assembly of the adjusting member (3) to the battery pack.

7. The guard exhaust assembly of claim 6, wherein, A reinforcing rib (32) is provided on a side of the adjusting member (3) away from the expansion member (11), and the reinforcing rib (32) is in a grid shape.

8. The guard exhaust assembly of any of claims 1-7, wherein, One side of the accommodating cavities in width is open, the protection support member (2) is provided in the accommodating cavities, and a limiting portion (12) cooperating with the protection support member (2) is provided on the open side of the accommodating cavities.

9. The guard exhaust assembly of any of claims 1-8, wherein, Further comprising a fixing structure for fixing a wire harness and a sensor, the accommodating cavities further comprise at least one fixing structure accommodating cavity, the fixing structure is provided in the fixing structure accommodating cavity, and the wire harness is electrically connected to the battery, and the sensor is used to measure an operating signal of the battery.

10. The guard vent assembly of any one of claims 1-9, wherein, The adjusting member (3) is provided with a first connecting portion (33), the expansion member (11) is provided with a second connecting portion (13) cooperating with the first connecting portion (33), so that the adjusting member (3) is detachably connected to the expansion member (11).

11. The guard exhaust assembly of any of claims 1-10, wherein, Further comprising a diaphragm (4), one side of the accommodating cavities in width is open, and the diaphragm (4) is provided at least between a bottom wall opposite to the open side of the accommodating cavities and the protection support member (2).

12. The guard exhaust assembly of claim 11, wherein, The diaphragm (4) is configured as a mica member.

13. The guard vent assembly of any one of claims 1-12, wherein, At least one set of limiting structures (14) is provided on both sides of the expansion member (11) in height, and the limiting structures (14) are adapted to position a heating film and a limiting adhesive tape.

14. The guard exhaust assembly of claim 13, wherein, A plurality of the limiting structures (14) are arranged in sequence in the length direction of the expansion member (11) to be suitable for positioning the heating film pieces and the limiting adhesive strips of different sizes respectively.

15. The guard vent assembly of claim 13, wherein, The limiting structure (14) is configured as one or more of a limiting groove, a limiting protrusion, and a limiting hole.

16. A battery pack, wherein, The battery pack comprises: a tray (101) defining a containing space, the tray (101) being provided with an explosion-proof valve; a battery and a protective exhaust assembly according to any one of claims 1-15, the protective exhaust assembly and the battery being arranged in the containing space; a spacing beam (103) arranged in the tray (101), the spacing beam (103) being formed with a communication channel (102) that communicates the exhaust channel (21) and the explosion-proof valve.

17. The battery pack of claim 16, wherein, The spacing beam (103) is provided with a spacing plate (104) that separates the communication channel (102) into a first sub-channel (1021) and a second sub-channel (1022) that extend along the length direction of the spacing beam (103) and are spaced apart, the battery and the protective exhaust assembly are arranged on both sides of the width of the spacing beam (103), and the two protective exhaust assemblies arranged on both sides of the width of the spacing beam (103) respectively communicate with the first sub-channel (1021) and the second sub-channel (1022).

18. The battery pack of claim 17, wherein, The explosion-proof valve is two, the explosion-proof valve is arranged on the tray (101) and located at both ends of the length of the spacing beam (103), and respectively communicates with the first sub-channel (1021) and the second sub-channel (1022).

19. The battery pack of any one of claims 16-18, wherein, The explosion-proof valve cover is provided with a flow guide cover (105), and a flow guide outlet of the flow guide cover (105) extends to the bottom side edge of the tray (101).

20. An electrical device, comprising: The battery pack comprises: The battery pack comprises:

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