Battery pack and automobile

Abstract

The utility model relates to the technical field of new energy batteries, and particularly discloses a battery pack which has a first direction, a second direction and a third direction which are intersected pairwise, and comprises battery cells and a fire extinguishing assembly, the battery cell is provided with an anti-explosion valve; the fire extinguishing assembly is arranged on the side, provided with the anti-explosion valve, of the battery cell, the fire extinguishing assembly comprises a material storage pipeline and a sealing piece, the material storage pipeline extends in the first direction, and a material spraying opening corresponding to the anti-explosion valve in the third direction is formed in the side, facing the anti-explosion valve, of the material storage pipeline; the sealing piece is connected to the material storage pipeline and seals the material spraying opening, and the sealing piece is configured to be capable of being damaged when the anti-explosion valve sprays out high-temperature substances. The utility model further discloses an automobile. When the battery cell breaks through or melts the sealing element due to thermal runaway, the high-pressure fire extinguishing agent in the material spraying pipeline can be sprayed to the anti-explosion valve of the battery cell through the material spraying opening, so that the fire extinguishing and flame retarding effects are achieved, the thermal diffusion after the thermal runaway of the battery is avoided, and the thermal safety of the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery pack and automobile. Background Technology

[0002] Existing battery thermal protection designs typically involve placing thermal insulation material between the large surfaces of the battery cells. Currently, most of the thermal insulation materials between cells are aerogel and ceramic silicone foam. In the event of thermal runaway, the thermal insulation material on the large surface of the cell provides insulation to prevent thermal runaway of adjacent cells, thus preventing heat diffusion throughout the battery pack; simultaneously, mica panels are used on top of the cells for thermal protection. This design is not only costly, but also fails to provide completely effective thermal protection for the battery in many situations, reducing the thermal safety index of the battery pack, and in severe cases, even causing the battery pack to catch fire or explode. Utility Model Content

[0003] The technical problem to be solved by this utility model is: how to solve the problems of high cost and poor thermal protection effect of the existing technology.

[0004] To solve the above-mentioned technical problems, this utility model provides a battery pack having a first direction, a second direction, and a third direction that intersect each other, including:

[0005] The battery cell, the battery cell having an explosion-proof valve; and,

[0006] A fire extinguishing assembly is disposed on the side of the battery cell having an explosion-proof valve. The fire extinguishing assembly includes a storage pipe and a seal. The storage pipe extends along the first direction, and the side of the storage pipe facing the explosion-proof valve has a spray nozzle corresponding to the explosion-proof valve in the third direction. The seal is connected to the storage pipe and seals the spray nozzle. The seal is configured to be destroyed when the explosion-proof valve sprays a high-temperature substance.

[0007] More preferably, along the second direction, the cross-sectional width of the storage pipe at the end away from the explosion-proof valve is greater than the cross-sectional width of the storage pipe at the end closer to the explosion-proof valve.

[0008] More preferably, the fire extinguishing assembly further includes:

[0009] The nozzle extends along the third direction, with one end connected to the material outlet and the other end abutting against the battery cell. The seal and the explosion-proof valve are both opposite to the nozzle in the third direction.

[0010] More preferably, the nozzle has an annular cylindrical structure, and the nozzle and the material storage pipe are integrally formed.

[0011] More preferably, the nozzle has a conical structure, and along the second direction, the cross-sectional width of the nozzle on the side closer to the seal is greater than the cross-sectional width of the nozzle on the side farther from the seal.

[0012] More preferably, the battery pack further includes a sealing gasket, which is disposed on the outer periphery of the explosion-proof valve, and one end of the nozzle abuts against the sealing gasket.

[0013] More preferably, the end of the storage pipe is provided with an injection port for injecting fire extinguishing agent.

[0014] More preferably, the battery pack further includes:

[0015] A housing, the housing having a receiving cavity having an opening, the battery cell being disposed within the receiving cavity; and...

[0016] A cover is provided over the opening, the explosion-proof valve of the battery cell faces the cover, and the storage pipe is connected to the cover.

[0017] More preferably, the storage pipe has flanges on opposite sides in the second direction; the battery pack further includes:

[0018] Fasteners for connecting the flange and the cover in the third direction.

[0019] More preferably, the flange is welded to the cover, and the fastener passes through the flange and the cover.

[0020] This utility model also provides a car, including the battery pack described above; and,

[0021] The battery pack is connected to the bottom mount.

[0022] Compared with the prior art, the battery pack and automobile provided by this utility model have the following advantages:

[0023] This invention provides a sealing element at the nozzle of the spraying pipe. When a battery cell experiences thermal runaway and breaks through the explosion-proof valve, the high-temperature, high-pressure material can be breached or melted by the sealing element. This allows the high-pressure extinguishing agent in the spraying pipe to be sprayed through the nozzle towards the explosion-proof valve of the battery cell, achieving fire extinguishing and flame retardant effects. This prevents heat diffusion after battery thermal runaway and improves the thermal safety of the battery pack. Furthermore, the solution described in this application eliminates the need for heat insulation materials and mica sheets in the battery for thermal protection, reducing costs and improving the volume utilization rate within the battery pack, thereby increasing the battery's energy density. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the structure of the battery pack described in this utility model.

[0025] Figure 2 This is an exploded view of the battery pack described in this utility model.

[0026] Figure 3 This is a schematic diagram of the assembly of the battery cell and fire extinguishing components described in this utility model.

[0027] Figure 4 This is a schematic diagram of the assembly of the fire extinguishing component and the cover of this utility model.

[0028] Figure 5 This is a top view of a battery pack according to the present invention.

[0029] Figure 6 This is a utility model Figure 5 A sectional view of section AA in the middle.

[0030] Figure 7 This is a utility model Figure 6 Enlarged diagram of point B in the middle.

[0031] Figure 8 This is a schematic diagram of another structure of the nozzle described in this utility model.

[0032] Figure 9 This is a partial schematic diagram of the fire extinguishing component described in this utility model.

[0033] Figure label:

[0034] 10. Shell; 11. Receiving cavity; 12. Opening;

[0035] 20. Cover;

[0036] 30. Battery cell; 31. Explosion-proof valve;

[0037] 40. Fire extinguishing assembly; 41. Material storage pipe; 411. Discharge nozzle; 42. Flange; 43. Inlet; 44. Seal; 45. Nozzle;

[0038] 50. Fasteners. Detailed Implementation

[0039] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0040] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection 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.

[0043] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Example 1

[0046] like Figures 1 to 9 As shown, this embodiment provides a battery pack having a first direction X, a second direction Y, and a third direction Z that intersect each other in pairs.

[0047] In some implementations, the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly.

[0048] In some embodiments, the battery pack includes a housing 10, a cover 20, a battery cell 30, and a fire extinguishing assembly 40. The housing 10 has a receiving cavity 11 with an opening 12, and the battery cell 30 is disposed within the receiving cavity 11. The cover 20 covers the opening 12. The battery cell 30 has an explosion-proof valve 31 facing the cover 20. The fire extinguishing assembly 40 is installed on the cover 20 and faces the explosion-proof valve 31. The fire extinguishing assembly 40 is filled with a high-pressure extinguishing agent. Thus, when the battery cell 30 experiences thermal runaway, the high-temperature, high-pressure substance breaks through the explosion-proof valve and the fire extinguishing assembly 40. The high-pressure extinguishing agent in the fire extinguishing assembly 40 is then sprayed towards the explosion-proof valve 31 of the battery cell, thereby achieving the effect of fire extinguishing and flame retardancy.

[0049] In some embodiments, the fire extinguishing assembly 40 includes a storage pipe 41 connected to the cover 20. The end of the storage pipe 41 is provided with an injection port 43 for injecting fire extinguishing agent, so that the fire extinguishing agent can be injected into the storage pipe 41 under high pressure. The storage pipe 41 extends along a first direction X, and the side of the storage pipe 41 facing the explosion-proof valve 31 is provided with a spray port 411 corresponding to the explosion-proof valve 31 in a third direction Z. In the event of thermal runaway, the fire extinguishing agent can be sprayed onto the explosion-proof valve 31 through the spray port 411 to achieve the effect of fire extinguishing and flame retardant, avoid thermal diffusion after battery thermal runaway, and improve the thermal safety of the battery pack.

[0050] In some implementations, the extinguishing agent is an ammonium phosphate dry powder extinguishing agent, an aerosol extinguishing agent, or a water-based extinguishing agent to ensure effective protection in the event of thermal runaway of the battery cell 30.

[0051] In some embodiments, after the high-temperature and high-pressure substance breaks through the explosion-proof valve, in order to facilitate the timely spraying of extinguishing agent by the fire extinguishing component 40, the fire extinguishing component 40 also has a sealing element 44. The sealing element 44 is connected to the storage pipe 41 and seals the spray port 411. The sealing element 44 is configured to be destroyed when the explosion-proof valve 31 sprays out high-temperature substance. That is, when the battery cell 30 thermally runs away, the high-temperature and high-pressure substance in the battery cell 30 first breaks through the explosion-proof valve 31, then breaks through the sealing element 44, the spray port 411 opens, and the high-pressure extinguishing agent in the storage pipe 41 sprays towards the explosion-proof valve 31, thereby achieving the effect of fire extinguishing and flame retardant, and avoiding the thermal diffusion after the battery thermally runs away.

[0052] In some embodiments, the seal 44 is preferably a sealing membrane configured to melt under the action of a high-temperature substance, so that the extinguishing agent can be sprayed toward the explosion-proof valve 31 to achieve the effect of extinguishing fire and retardant flame.

[0053] In some embodiments, along the second direction Y, the cross-sectional width of the storage pipe 41 at the end away from the explosion-proof valve 31 is greater than the cross-sectional width of the storage pipe 41 at the end near the explosion-proof valve 31. Specifically, the cross-sectional width of the spray pipe 41 in the second direction Y of this application gradually decreases from the end away from the explosion-proof valve 31 to the end near the explosion-proof valve 31, thereby forming a funnel-shaped trapezoidal structure. Under high pressure, this structure enables the extinguishing agent to be sprayed quickly from the spray nozzle 411 to the explosion-proof valve 31, thereby improving the flame-retardant effect.

[0054] In some embodiments, to further improve the fire extinguishing and flame retardant effect, the fire extinguishing assembly 40 also includes a nozzle 45, which extends along the third direction Z. One end of the nozzle 45 is connected to the spray port 411, and the other end abuts against the battery cell 30. The seal 44 and the explosion-proof valve 31 are both opposite to the nozzle 45 in the third direction Z. In this way, the fire extinguishing agent sprayed from the spray port 411 can be directed towards the explosion-proof valve 31 under the action of the nozzle 45, further improving the flame retardant effect. At the same time, it can prevent the thermal diffusion after the battery cell thermal runaway from affecting adjacent battery cells, thus improving the thermal safety of the battery pack.

[0055] In some embodiments, the nozzle 45 has an annular cylindrical structure to completely surround the explosion-proof valve 31 and prevent heat diffusion.

[0056] In some embodiments, the nozzle 45 and the storage pipe 41 are integrally formed to ensure the connection strength between the nozzle 45 and the storage pipe 41 and to prevent the nozzle 45 from being damaged when the explosion-proof valve 31 sprays out high-temperature and high-pressure substances.

[0057] In some embodiments, the nozzle 45 has a conical structure. Specifically, along the second direction Y, the cross-sectional width of the nozzle 45 on the side near the seal 44 is greater than the cross-sectional width of the nozzle 45 on the side away from the seal 44. That is, the cross-sectional width of the nozzle 45 in the second direction Y gradually narrows from the side near the seal 44 to the side near the explosion-proof valve 31, so that the nozzle 45 also forms a funnel trapezoidal structure. Under high pressure, the extinguishing agent can be quickly sprayed from the spray port 411 to the explosion-proof valve 31, further improving the flame retardant effect.

[0058] In some embodiments, to further improve the thermal safety of the battery and prevent heat diffusion, the battery pack of this embodiment also includes a sealing gasket 32. The sealing gasket 32 ​​is disposed on the outer periphery of the explosion-proof valve 31, and one end of the nozzle 45 abuts against the sealing gasket 32. In this way, there is no gap between the nozzle 45 and the battery cell 30, so as to avoid the adjacent battery cell 30 from being affected by the leakage of high temperature and high pressure substances from the gap.

[0059] In some embodiments, to facilitate the installation and connection of the storage pipe 41 and the cover 20, the storage pipe 41 is provided with flanges 42 on opposite sides in the second direction Y; the battery pack also includes fasteners 50, which are used to connect the flanges 42 and the cover 20 in the third direction Z, and the flanges 42 can also enhance the connection strength between the battery pack and the vehicle undercarriage.

[0060] In some embodiments, the fastener 50 is preferably a bolt.

[0061] In some embodiments, the flange 42 is welded to the cover 20, and the fastener 50 passes through the flange 42 and the cover 20. In this way, the fastener 50 fixes the cover 20 to the bottom of the vehicle, thereby enhancing the strength of the entire battery pack and improving its reliability.

[0062] It should be noted that the battery pack using this embodiment does not require the use of heat insulation materials and mica plates in the battery cells for thermal protection, thus reducing costs and improving the volume utilization rate within the battery pack, thereby increasing the energy density of the battery.

[0063] Example 2

[0064] This embodiment provides a car including the battery pack of Embodiment 1.

[0065] The vehicle also includes a bottom mount, and the battery pack is fixedly connected to the bottom mount by fasteners 50. Specifically, the fasteners 50 pass through the flange 42 of the storage pipe 41 and the cover 20 in sequence and are then connected to the bottom mount, thereby enhancing the overall strength of the battery pack and improving its reliability.

[0066] The working process of this utility model is as follows: Please refer to... Figures 1 to 9 During assembly, the fire extinguishing component 40 is fixed to the cover 20 using fasteners 50, the battery cell 30 is installed inside the housing 10, the cover 20 is placed over the opening 12 of the housing 10, and the nozzle 45 abuts against the sealing gasket 32 ​​on the outer periphery of the explosion-proof valve 31, thus completing the assembly. Finally, the entire battery pack is fixed to the bottom mount of the vehicle using fasteners 50. When the battery cell 30 experiences thermal runaway, the high-temperature and high-pressure material breaks through the explosion-proof valve and the seal 44, allowing the high-pressure fire extinguishing agent in the spray pipe 41 to be sprayed through the spray nozzle 411 towards the explosion-proof valve 31 of the battery cell, thereby achieving the effect of fire extinguishing and flame retardant.

[0067] In summary, this utility model provides a battery pack and an automobile. By providing a sealing element 44 at the nozzle 411 of the spray pipe 41, when the battery cell 30 experiences thermal runaway and breaks through the explosion-proof valve, the high-temperature and high-pressure material can be broken through or melted by the sealing element 44. This allows the high-pressure fire extinguishing agent in the spray pipe 41 to be sprayed through the nozzle 411 towards the explosion-proof valve 31 of the battery cell, thereby achieving the effect of fire extinguishing and flame retardancy, preventing heat diffusion after battery thermal runaway, and improving the thermal safety of the battery pack. In addition, by adopting the solution of this application, there is no need to use heat insulation materials and mica plates in the battery for thermal protection, reducing costs and improving the volume utilization rate of the battery pack, thus increasing the energy density of the battery.

[0068] The above description is merely a preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model. The basic principles, main features, and advantages of this utility model have been shown and described above. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.

[0069] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery pack having intersecting first directions (X), second directions (Y), and a third direction (Z), characterized in that, include: Battery cell (30), said battery cell (30) having an explosion-proof valve (31); and, A fire extinguishing assembly (40) is placed on the side of the battery cell (30) having an explosion-proof valve (31). The fire extinguishing assembly (40) includes a storage pipe (41) and a seal (44). The storage pipe (41) extends along the first direction (X), and the side of the storage pipe (41) facing the explosion-proof valve (31) has a nozzle (411) corresponding to the explosion-proof valve (31) in the third direction (Z). The seal (44) is connected to the storage pipe (41) and seals the nozzle (411). The seal (44) is configured to be destroyed when the explosion-proof valve (31) sprays a high-temperature substance.

2. The battery pack according to claim 1, characterized in that, Along the second direction (Y), the cross-sectional width of the storage pipe (41) at the end away from the explosion-proof valve (31) is greater than the cross-sectional width of the storage pipe (41) at the end near the explosion-proof valve (31).

3. A battery pack according to claim 1, characterized in that, The fire extinguishing assembly (40) also includes: The nozzle (45) extends along the third direction (Z), and one end of the nozzle (45) is connected to the nozzle (411), and the other end abuts against the battery cell (30). The seal (44) and the explosion-proof valve (31) are both opposite to the nozzle (45) in the third direction (Z).

4. A battery pack according to claim 3, characterized in that, The nozzle (45) has an annular cylindrical structure, and the nozzle (45) and the storage pipe (41) are integrally formed.

5. A battery pack according to claim 3, characterized in that, The nozzle (45) has a conical structure. Along the second direction (Y), the cross-sectional width of the nozzle (45) on the side closer to the seal (44) is greater than the cross-sectional width of the nozzle (45) on the side farther away from the seal (44).

6. A battery pack according to claim 3, characterized in that, The battery pack also includes a sealing gasket (32), which is located on the outer periphery of the explosion-proof valve (31), and one end of the nozzle (45) abuts against the sealing gasket (32).

7. A battery pack according to claim 1, characterized in that, The end of the storage pipe (41) is provided with an injection port (43) for injecting fire extinguishing agent.

8. A battery pack according to claim 1, characterized in that, The battery pack also includes: A housing (10) having a receiving cavity (11) having an opening (12), and the battery cell (30) being disposed within the receiving cavity (11); and, A cover (20) is provided over the opening (12), the explosion-proof valve (31) of the battery cell (30) faces the cover (20), and the storage pipe (41) is connected to the cover (20).

9. A battery pack according to claim 8, characterized in that, The storage pipe (41) has flanges (42) on opposite sides in the second direction (Y); the battery pack also includes: Fastener (50) for connecting the flange (42) and the cover (20) in the third direction (Z).

10. A battery pack according to claim 9, characterized in that, The flange (42) is welded to the cover (20), and the fastener (50) passes through the flange (42) and the cover (20).

11. A car, characterized in that, Including the battery pack as described in any one of claims 1-0; and, The battery pack is connected to the bottom mount.

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