Battery box body and battery device
By designing a pressure relief mechanism in the battery housing, including pressure relief components and flow guides, the problem of difficult directional emission of high-temperature flammable gases during battery thermal runaway is solved, thereby improving safety and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU GREATER BAY TECH CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-28
AI Technical Summary
When a battery experiences thermal runaway, the large amount of high-temperature flammable gas discharged by the pressure relief device is difficult to vent in a directed manner, which may cause safety problems such as fires outside the battery box.
A battery housing is designed, including a pressure relief mechanism, comprising a pressure relief component and a flow guide. The pressure relief component opens when the gas pressure exceeds a threshold, and the gas is discharged directionally through the discharge port of the flow guide. The discharge port area is increased. The flow guide includes an extension section and a cover. The cover is provided with a pressure relief area to control the gas discharge path.
It enables the directional emission of high-temperature combustible gases, preventing gas from accumulating outside the casing and causing a fire, thus improving the safety and reliability of the battery device.
Smart Images
Figure CN224177412U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery housing and battery device. Background Technology
[0002] A battery is a device that converts chemical energy into electrical energy. It generates current through internal chemical reactions to provide power to external devices.
[0003] Batteries may experience thermal runaway when overcharged, over-discharged, short-circuited, mechanically damaged, or exposed to high temperatures, leading to a rapid increase in internal temperature and pressure, which may even cause accidents such as fires and explosions. Therefore, batteries are usually equipped with pressure relief devices. When the internal pressure of the battery exceeds a set threshold, the pressure relief device opens and quickly releases the high-temperature and high-pressure gas inside to achieve timely pressure relief and prevent battery explosion.
[0004] When a battery experiences thermal runaway, the electrolyte decomposes and produces a large amount of gas, which may also contain metal particles, carbon black, and other particulate matter. These high-temperature, high-pressure gases, once discharged from the battery casing, not only affect the external environment, but also, because the gas flows in all directions after being released by the pressure relief device, it is difficult to control the directional discharge of the gas. When the thermal runaway is severe, the large amount of high-temperature flammable gas discharged by the pressure relief device in a short period of time may also cause safety problems such as fires outside the battery casing. Utility Model Content
[0005] The purpose of this invention is to provide a battery housing and battery device to solve the problem that a large amount of high-temperature flammable gas discharged by the pressure relief component during battery thermal runaway is difficult to directionally discharge.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] In a first aspect, a battery enclosure includes: an enclosure body having an internal accommodating space; and a pressure relief mechanism comprising a pressure relief component and a flow guide, wherein the pressure relief component is disposed on the enclosure body, and the flow guide surrounds the exhaust end of the pressure relief component so that gas discharged from the exhaust end enters the flow guide, and the flow guide has an outlet. The pressure relief mechanism is used to open the pressure relief component and discharge gas to the flow guide when the gas pressure inside the accommodating space is greater than the opening threshold of the pressure relief component, thereby increasing the area of the outlet and relieving the gas pressure inside the accommodating space through the pressure relief component and the outlet on the flow guide.
[0008] Preferably, the housing body includes a side plate, and the pressure relief component and the flow guide are both disposed on the side plate.
[0009] Preferably, the guide section is provided with a guide space that connects to the exhaust end. The guide space is connected to the discharge port. When the pressure relief component is opened, the guide space expands to increase the area of the discharge port.
[0010] Preferably, the flow guide includes an extension section and a cover, the discharge port is opened in the extension section, the pressure relief component, the extension section and the cover enclose the flow guide space, and after the pressure relief component is opened, the extension section expands, making the flow guide space larger and the discharge port area larger.
[0011] Preferably, the discharge port is located on the side wall of the extension section, and after the pressure relief component is opened, the extension section extends along a first direction; and / or, the extension section expands radially with the first direction as its axis; the first direction is a direction perpendicular to the side plate.
[0012] Preferably, the cover is provided with a pressure relief zone so that when the air pressure inside the flow guiding space is greater than the opening threshold of the pressure relief zone, the flow guiding space is connected to the outside through the cover; the opening threshold of the pressure relief component is less than the opening threshold of the pressure relief zone.
[0013] Preferably, the pressure relief zone is a weak area located on the cover.
[0014] Preferably, the pressure relief mechanism further includes a connector connected to the flow guide, the connector being disposed on the housing body to limit the relative position of the flow guide and the housing body.
[0015] Preferably, the cover includes a fire-extinguishing layer.
[0016] In a second aspect, a battery device includes a battery cell and a battery housing as described above, wherein the battery cell is disposed within the accommodating space.
[0017] The beneficial effects of this utility model are:
[0018] A battery enclosure includes a enclosure body and a pressure relief mechanism. The enclosure body has an internal accommodating space. The pressure relief mechanism includes a pressure relief component and a flow guide. The pressure relief component is disposed on the enclosure body, and the flow guide surrounds the exhaust end of the pressure relief component so that the gas discharged from the exhaust end enters the flow guide. The flow guide has an exhaust port. When the gas pressure inside the accommodating space is greater than the opening threshold of the pressure relief component, the pressure relief component opens and discharges the gas to the flow guide. The area of the exhaust port increases, and the gas pressure inside the accommodating space is relieved through the pressure relief component and the exhaust port on the flow guide.
[0019] Thus, when the battery experiences thermal runaway and generates a large amount of high-temperature flammable gas mixed with particulate matter, the pressure relief component can discharge the gas from the exhaust end to the interior of the guide section. The area of the exhaust port is increased to facilitate the directional discharge of a large amount of high-temperature flammable gas to the outside through the exhaust port, avoiding the accumulation of a large amount of high-temperature flammable gas on the outside of the casing body and causing safety problems such as fire and explosion. This reduces the impact of high-temperature flammable gas on the surrounding environment and improves the safety and reliability of the battery device. Attached Figure Description
[0020] Figure 1 This is a partial structural schematic diagram of the battery box in one embodiment of the present invention;
[0021] Figure 2 This is one embodiment of the present invention. Figure 1 Enlarged view of point A;
[0022] Figure 3 This is one embodiment of the present invention. Figure 1 Enlarged view of point B.
[0023] In the picture:
[0024] 1. Side plate; 2. Pressure relief mechanism; 21. Pressure relief component; 22. Flow guide; 221. Discharge port; 222. Extension section; 223. Cover; 2231. Pressure relief zone; 23. Connecting component; X, First direction. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.
[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0029] See Figures 1 to 3 This utility model provides a battery box, including a box body and a pressure relief mechanism 2. The box body has an internal accommodating space (not shown in the figure). The pressure relief mechanism 2 includes a pressure relief component 21 and a flow guide 22. The pressure relief component 21 is disposed on the box body, and the flow guide 22 surrounds the exhaust end of the pressure relief component 21 (not shown in the figure) so that the gas discharged from the exhaust end enters the flow guide 22. The flow guide 22 has an exhaust port 221. When the gas pressure inside the accommodating space is greater than the opening threshold of the pressure relief component 21, the pressure relief mechanism 2 is used to open the pressure relief component 21 and discharge the gas to the flow guide 22. The area of the exhaust port 221 increases, and the gas pressure in the accommodating space is relieved through the pressure relief component 21 and the exhaust port 221 on the flow guide 22.
[0030] In this embodiment, the pressure relief component 21 and the flow guide 22 are arranged in a one-to-one correspondence. The flow guide 22 has an initial state and a deformed state. When the air pressure inside the accommodating space is greater than the opening threshold of the pressure relief component 21, the flow guide 22 switches from the initial state to the deformed state. The pressure relief component 21 is an explosion-proof valve.
[0031] Thus, when the battery experiences thermal runaway, a large amount of high-temperature combustible gas mixed with particulate matter generated inside the casing can be discharged into the guide section 22 through the exhaust end of the pressure relief component 21. This allows the guide section 22 to guide the gas flow direction, increasing the area of the exhaust port 221 and thus increasing the exhaust volume of the exhaust port 221. This enables the high-temperature combustible gas to be directionally discharged to the outside through the exhaust port 221, preventing a large amount of high-temperature combustible gas from accumulating outside the casing and causing safety problems such as fire and explosion. It also reduces the impact of high-temperature combustible gas on the surrounding environment and improves the safety and reliability of the battery device.
[0032] It is understood that the pressure relief component 21 can also be an explosion-proof sheet or explosion-proof membrane, etc. The number of pressure relief components 21 can be adjusted according to the specifications of the enclosure body and actual needs. There can be one or multiple pressure relief components 21. The pressure relief components 21 can also be set in a non-one-to-one correspondence with the flow guide 22. For example, multiple pressure relief components 21 can be set inside the same flow guide 22. The pressure relief component 21 can effectively discharge the internal gas to the outside through the discharge port 221 of the flow guide 22 when the gas pressure inside the containment space is greater than the threshold. Further examples are not listed here.
[0033] See Figure 2 In some embodiments, the housing body includes a side plate 1, a pressure relief component 21 and a flow guide 22, all of which are disposed on the side plate 1.
[0034] In this embodiment, the box body also includes a top plate (not shown in the figure) and a bottom plate (not shown in the figure), a side plate 1 is disposed between the top plate and the bottom plate, and the side plate 1, the top plate and the bottom plate enclose a receiving space, and the flow guide 22 is disposed on the side of the side plate 1 away from the receiving space.
[0035] Thus, the flow guide 22 is located on the side of the side plate 1 away from the accommodating space, which can avoid occupying the internal space of the box body and avoid assembly interference with other components in the accommodating space. It can effectively utilize the external space of the box body to achieve directional gas discharge and improve the reliability and safety of the battery device.
[0036] It is understandable that the positions of the pressure relief component 21 and the flow guide 22 can be adjusted according to actual needs, which will not be elaborated here.
[0037] See Figure 2 In some embodiments, the guide section 22 is provided with a guide space (not shown in the figure) that is connected to the exhaust end. The guide space is connected to the discharge port 221. After the pressure relief component 21 is opened, the guide space expands so that the area of the discharge port 221 increases.
[0038] Thus, when the pressure relief component 21 is opened, the flow guiding space and the containment space are connected, so that the gas can be discharged to the outside through the increased area of the discharge port 221. Due to the expansion of the flow guiding space and the increase in the area of the discharge port 221, it can accommodate the discharge of a large amount of gas, realize rapid directional pressure relief, and avoid the accumulation of a large amount of high-temperature flammable gas mixed with particles outside the box body and the problem of causing fire on the outside of the battery box caused by the pressure relief component in a short period of time, thereby improving the safety and reliability of the battery device.
[0039] See Figure 2 In some embodiments, the flow guide 22 includes an extension section 222 and a cover 223. The discharge port 221 is opened in the extension section 222. The pressure relief member 21, the extension section 222 and the cover 223 enclose a flow guide space. After the pressure relief member 21 is opened, the extension section 222 expands, making the flow guide space larger and the area of the discharge port 221 increases.
[0040] In this embodiment, the cover 223 is a circular thin sheet structure, the cover 223 is fixedly connected to the extension section 222, and the cover 223 and the extension section 222 are coaxially arranged.
[0041] Thus, when the battery experiences thermal runaway, the large amount of high-temperature combustible gas discharged by the pressure relief component 21 can flow along the axial direction of the guide section 22, preventing the gas from spreading during the discharge process and causing fires outside the battery box, thereby reducing pollution to the surrounding environment; the cover 223 can enhance the structural strength of the end of the extension section 222 away from the pressure relief component 21, improve the exhaust stability, and thus enhance the reliability of the battery box.
[0042] It is understandable that the cover 223 can also be detachably connected to the extension section 222 by means of snap-fit, adhesive or other means. The connection method between the cover 223 and the extension section 222 can be adjusted according to actual needs, and will not be listed in detail here.
[0043] See Figure 2 In some embodiments, the discharge port 221 is disposed on the side wall of the extension section 222. After the pressure relief component 21 is opened, the extension section 222 extends along the first direction X; and / or, the extension section 222 expands radially with the first direction X as the axis; the first direction X is a direction perpendicular to the side plate 1.
[0044] In this embodiment, the extension section 222 is a bellows structure made of folded metal sheets, and the extension section 222 is fixedly connected to the pressure relief component 21.
[0045] Thus, the corrugated pipe structure made of folded metal sheets has good temperature resistance and tensile ductility, which can expand the flow space and facilitate the flow of a large amount of high-temperature combustible gas. When the pressure relief component 21 is opened and the gas is discharged, the expansion section 222 expands and guides the gas to flow in a predetermined direction, avoiding the gas from spreading during the discharge process and reducing the risk of a large amount of high-temperature combustible gas causing a fire on the outside of the battery box.
[0046] It is understood that the extension section 222 can also be made of elastic material or can be a sleeve structure to achieve expansion and contraction along the first direction X or radial deformation with the first direction X as the axis. The extension section 222 can also be set on the top plate or the bottom plate. It can be configured to deform and guide the gas to be discharged in a directional manner when the internal air pressure of the accommodating space exceeds the threshold. The specific structure and setting position of the extension section 222 can be adjusted according to actual needs, and will not be listed in detail here.
[0047] It is understandable that the extension segment 222 can extend only along the first direction X, expand radially only with the first direction X as the axis, or both extend along the first direction X and expand radially with the first direction X as the axis. The deformation mode of the extension segment 222 can be adjusted according to actual needs, and will not be listed in detail here.
[0048] See Figure 2 In some embodiments, the discharge port 221 is disposed on the side wall of the extension section 222, and when the extension section 222 is in a deformed state, the length direction of the discharge port 221 is parallel to the length direction of the extension section 222.
[0049] In this embodiment, the discharge port 221 is a square hole structure, and the two ends of the discharge port 221 are respectively spaced apart from the two ends of the extension section 222, so that the position where the discharge port 221 is opened in the extension section 222 has sufficient structural strength.
[0050] Thus, when the extension section 222 is in its initial state, the area of the discharge port 221 is relatively small, which can maintain the connection between the extension section 222 and the outside world, allowing a small amount of gas to be discharged to the outside world through the discharge port 221, ensuring that the gas pressure in the containment space is within the threshold range. When the gas pressure in the containment space exceeds the threshold, the large amount of high-temperature combustible gas discharged by the pressure relief component 21 can impact the extension section 222, causing the extension section 222 to elongate and the area of the discharge port 221 to increase. This guides the high-temperature combustible gas to flow inside the extension section 222, so that the more gas discharged by the pressure relief component 21, the more gas is discharged to the outside through the discharge port 221, achieving rapid directional gas discharge and preventing the gas from flowing to the surroundings after the pressure relief component 21 discharges gas, thereby reducing the risk of fire outside the battery box. The extension section 222 has sufficient structural strength to prevent the location of the discharge port 221 in the extension section 222 from tearing under the impact of gas, extending the service life of the extension section 222 and improving the reliability and safety of the battery device.
[0051] It is understandable that the shape of the discharge port 221 can also be circular, rhomboid, etc. The shape and location of the discharge port 221 can be adjusted according to the required gas emission direction, which will not be listed in detail here.
[0052] See Figure 3 In some embodiments, the cover 223 is provided with a pressure relief zone 2231 so that when the air pressure inside the flow guide space is greater than the opening threshold of the pressure relief zone 2231, the flow guide space is connected to the outside through the cover 223; the opening threshold of the pressure relief component 21 is less than the opening threshold of the pressure relief zone 2231. Further, the pressure relief zone 2231 is a weak area provided on the cover 223.
[0053] In this embodiment, the pressure relief area 2231 is a cross-shaped cut on the cover 223. The cross-shaped cut is concentric with the cover 223. When the pressure relief pressure is greater than the valve opening pressure of the pressure relief component 21 by more than 4 kPa, the cross-shaped cut opens and increases the pressure relief area to avoid excessive gas pressure at the cover 223 from affecting normal exhaust and pressure relief.
[0054] Thus, by setting the discharge port 221 and the cross-shaped cut, the pressure relief component 21 can choose different paths to discharge gases of different pressures, improving the discharge flexibility of the gas discharged into the guide section 22, avoiding damage to the guide section 22 due to excessive local gas pressure, extending the service life of the pressure relief mechanism 2, limiting the diffusion range of the gas, and avoiding safety issues such as fire caused by high-temperature flammable gas, thereby reducing the impact on the environment.
[0055] It is understandable that the pressure relief zone 2231 can also be a structure that can be opened when the gas pressure exceeds the threshold, such as a pressure relief valve or a diaphragm, so as to enable the gas in the guide extension section 222 to be discharged to the outside through the cover 223. No further examples will be given here.
[0056] See Figure 2 In some embodiments, the pressure relief mechanism 2 further includes a connector 23 connected to the flow guide 22. The connector 23 is disposed on the housing body to limit the relative position of the flow guide 22 and the housing body. Further, in some embodiments, the connector 23 is a clamp, which is connected to the pressure relief component 21.
[0057] In this embodiment, the pressure relief component 21 is provided with a groove (not shown in the figure), the clamp is clamped in the groove and connected to the extension section 222 to restrict the position of the extension section 222 and the pressure relief component 21 on the side plate 1. The pressure relief component 21, the guide section 22, and the connector 23 are all provided on the side of the side plate 1 away from the accommodating space.
[0058] Thus, the connector 23 can improve the connection stability between the extension section 222 and the side plate 1, ensuring that the extension section 222 and the pressure relief component 21 are tightly abutted together. This prevents the extension section 222 from shifting or loosening during the extension and retraction process, thus affecting the directional exhaust effect. It also allows the gas discharged from the pressure relief component 21 to be guided into the interior of the extension section 222, preventing the gas from escaping through the connection between the pressure relief component 21 and the extension section 222. Furthermore, it facilitates the loading and unloading of the extension section 222 without requiring entry into the accommodating space, improving loading and unloading efficiency and reducing loading and unloading difficulty. It also allows staff to observe the status of the pressure relief component 21, the extension section 222, and the cover 223, and replace the corresponding components in a timely manner.
[0059] See Figure 2 In some embodiments, the cap 223 includes a fire extinguishing layer (not shown in the figure).
[0060] In this embodiment, the fire extinguishing layer of the cap 223 is made of nano-microcapsule fire extinguishing material. The core material inside the nano-microcapsule fire extinguishing material is solid perfluorohexane, and the temperature range for its rupture and release of gaseous fire extinguishing agent is 110℃-150℃.
[0061] In this way, when heated, the microcapsule structure of the nano-microcapsule fire extinguishing material breaks down and releases the gas inside, achieving efficient heat absorption and fire extinguishing effects. When the battery experiences thermal runaway, the cover 223 can prevent the high-temperature flammable gas discharged from the pressure relief component 21 from igniting. The gas is directionally discharged to the outside through the cross-shaped cut and the discharge port 221, which can reduce the impact on the surrounding environment and improve the reliability and safety of the box body.
[0062] It is understood that the cover 223 may also include a cover base plate, a protective layer, and an extinguishing agent built into the protective layer, so that the protective layer can rupture and release the extinguishing agent under specific temperature or pressure. The material and specific structure of the cover 223 can be adjusted according to actual needs, as long as it can prevent the ignition of high-temperature combustible gas and has sufficient structural strength to guide the directional movement of high-temperature combustible gas, which will not be elaborated here.
[0063] It should be noted that, Figure 2 This is a schematic diagram of the extended segment 222 in a deformed state. Figure 3 This diagram illustrates the initial state of the extension section 222. Under normal operating conditions, the extension section 222 is in its initial state, and its interior is connected to the outside through the exhaust port 221. Under abnormal operating conditions, the internal pressure of the housing increases abnormally. Once it exceeds the threshold, it is released into the extension section 222 through the pressure relief component 21. A large amount of high-temperature combustible gas impacts the cover 223 and causes the extension section 222 to extend, increasing the area of the exhaust port 221. The gas can then be directionally released to the outside through the exhaust port 221 and the cross-shaped cut. The cover 223 releases fire extinguishing gas when heated, preventing fires from igniting outside the battery housing. When the internal pressure of the containment space drops to within the threshold range, the staff can manually reset or replace the extension section 222 and the cover 223 for easy reuse.
[0064] See Figure 1 This utility model also provides a battery device, including a battery cell (not shown in the figure) and a battery housing, wherein the battery cell is disposed within an accommodating space. The battery cell may be an all-solid-state battery, a semi-solid-state battery, a liquid battery, etc.
[0065] Example 2
[0066] In Embodiment 2, the same or corresponding components as in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described.
[0067] In some embodiments, the connector 23 may also be a connecting ring made of a spring, which is sleeved on the outer wall of the extension section 222 and engaged in the groove of the pressure relief member 21.
[0068] In this way, the connecting ring can limit the relative position of the flow guide 22 and the pressure relief component 21, so that the flow guide 22 and the pressure relief component 21 can be stably connected when the battery is thermally runaway, avoiding the expansion section 222 and the pressure relief component 21 from falling off due to gas impact and affecting the directional exhaust effect.
[0069] It is understandable that the connecting ring can also be made of elastic materials such as rubber, which can ensure that the extension section 222 and the pressure relief component 21 are tightly abutted and prevent gas from escaping from the connection between the pressure relief component 21 and the extension section 222. Further details will not be provided here.
[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery housing, characterized in that, include: The box body has an internal accommodating space. The pressure relief mechanism (2) includes a pressure relief component (21) and a flow guide (22). The pressure relief component (21) is disposed on the housing body. The flow guide (22) surrounds the exhaust end of the pressure relief component (21) so that the gas discharged from the exhaust end enters the flow guide (22). The flow guide (22) has an exhaust port (221). The pressure relief mechanism (2) is used to open the pressure relief component (21) and discharge the gas to the flow guide (22) when the gas pressure inside the accommodating space is greater than the opening threshold of the pressure relief component (21). The area of the exhaust port (221) increases, and the gas pressure inside the accommodating space is relieved through the pressure relief component (21) and the exhaust port (221) on the flow guide (22).
2. The battery housing according to claim 1, characterized in that, The housing body includes a side plate (1), and the pressure relief component (21) and the flow guide (22) are both disposed on the side plate (1).
3. The battery housing according to claim 2, characterized in that, The guide section (22) is provided with a guide space that connects to the exhaust end. The guide space is connected to the discharge port (221). When the pressure relief component (21) is opened, the guide space expands so that the area of the discharge port (221) increases.
4. The battery housing according to claim 3, characterized in that, The flow guide (22) includes an extension section (222) and a cover (223). The discharge port (221) is opened in the extension section (222). The pressure relief component (21), the extension section (222) and the cover (223) enclose the flow guide space. After the pressure relief component (21) is opened, the extension section (222) expands, making the flow guide space larger and increasing the area of the discharge port (221).
5. The battery housing according to claim 4, characterized in that, The discharge port (221) is disposed on the side wall of the extension section (222). After the pressure relief component (21) is opened, the extension section (222) extends along the first direction (X); and / or, the extension section (222) expands radially with the first direction (X) as the axis. The first direction (X) is perpendicular to the side plate (1).
6. The battery housing according to claim 4, characterized in that, The cover (223) is provided with a pressure relief area (2231) so that when the air pressure inside the flow guide space is greater than the opening threshold of the pressure relief area (2231), the flow guide space is connected to the outside through the cover (223); The opening threshold of the pressure relief component (21) is less than the opening threshold of the pressure relief zone (2231).
7. The battery housing according to claim 6, characterized in that, The pressure relief zone (2231) is a weak area set on the cover (223).
8. The battery housing according to claim 4, characterized in that, The pressure relief mechanism (2) further includes a connector (23) connected to the flow guide (22), the connector (23) being disposed on the housing body to limit the relative position of the flow guide (22) and the housing body.
9. The battery housing according to claim 4, characterized in that, The cover (223) includes a fire-extinguishing layer.
10. A battery device, characterized in that, It includes a battery cell and a battery housing as described in any one of claims 1-9, wherein the battery cell is disposed within the accommodating space.