Power battery pack sealed cabin with waterproof breathable film

Abstract

The utility model discloses a power battery pack sealed cabin with a waterproof breathable film, which comprises a bottom shell, an upper shell and a floating plate, the bottom shell is fixedly connected with the upper shell through screws, a battery module is fixed in the bottom shell, the upper surface of the upper shell is provided with a sinking groove for placing the floating plate, and the floating plate is arranged in the sinking groove. A guide structure for limiting the floating plate is arranged outside the bottom shell, a driving structure for driving the floating plate to float is arranged in the upper shell, and a fireproof coating injection structure is fixed to the top of the floating plate. According to the utility model, the filter paper is arranged between the adjacent battery modules, so that the filter paper keeps air permeability under a normal working condition, the obstruction of a traditional fireproof partition plate to heat conduction is avoided, and the efficient heat dissipation of the battery is ensured; the polyurethane fireproof foam fills gaps of the filter paper through the injection nozzle to form a flame-retardant isolation layer, so that the fire spreading speed is delayed.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically a sealed chamber for a power battery pack with a waterproof and breathable membrane. Background Technology

[0002] The sealing of power battery packs is usually divided into a three-level sealing system, with protection strengthened step by step from the cell to the module and then to the battery pack. The outer casing of the battery pack usually uses fluororubber sealing strips and bolts to pre-tighten the upper cover and the lower casing to seal them, and then fills the micro-gaps with an adhesive process, such as polyurethane adhesive.

[0003] The multi-layer fireproof isolation structure inside the cabin is mostly set outside the battery module. According to the search, the patent application number CN219457920U2 discloses a fireproof partition structure for automobile batteries, including a shell, at least two battery components are provided in the shell, and a detachably connected partition is provided in the shell. The partition is located between the two battery components and is made of fireproof material. The battery component includes a mounting frame and a battery, and the partition is detachably connected to the mounting frame.

[0004] The device reduces the spread of fire by adding a partition between adjacent modules of the power battery. However, adding a fireproof partition directly inside the sealed chamber can affect the heat dissipation of the battery pack. When the battery modules are working normally, the accumulated heat can easily affect the normal operation of the battery and increase the incidence of fire. Utility Model Content

[0005] The purpose of this utility model is to provide a sealed housing for a power battery pack with a waterproof and breathable membrane. By fixing filter paper between adjacent battery modules, when one of the battery modules burns, fire-retardant coating is immediately injected between the filter paper. This will not affect the heat dissipation of the battery module during normal use, and will extend the flame blocking time of the module after it burns.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealed battery pack housing with a waterproof and breathable membrane, comprising a bottom shell, an upper shell, and a floating plate. The bottom shell and the upper shell are fixedly connected by screws. A battery module is fixed inside the bottom shell. A sinking groove for placing the floating plate is opened on the upper surface of the upper shell. A guide structure for restricting the floating plate is provided on the outside of the bottom shell. A driving structure for driving the floating plate to float is provided inside the upper shell. A fireproof coating injection structure is fixed on the top of the floating plate.

[0007] The fireproof coating injection structure includes a smoke sensor, an injection machine, and an injection nozzle. The sinking groove is provided with a slot for the injection nozzle to pass through the upper shell. A rubber pad is glued into the slot. A cross-shaped cut is opened in the middle of the rubber pad. A waterproof and breathable membrane body is provided between the slot and the floating plate.

[0008] Preferably, the fire-retardant coating injection structure further includes filter paper, and the injection nozzle is provided in two sets. There are two pieces of filter paper fixed between adjacent battery modules, and the injection nozzle is located above the gap between the two pieces of filter paper.

[0009] Preferably, the waterproof and breathable membrane body is arranged in a ring shape, the bottom end of the waterproof and breathable membrane body is bonded to the inner wall of the groove, and the top end of the waterproof and breathable membrane body is bonded to the bottom of the floating plate.

[0010] Preferably, the injection machine includes an injection pump and a polyurethane fire-retardant foam storage tank, and the injection pump is connected to the polyurethane fire-retardant foam storage tank and the injection nozzle through pipelines.

[0011] Preferably, the guiding structure includes a guide post and a limiting tube. The guide post is welded to the bottom of the floating plate, the limiting tube is welded to the outer wall of the bottom shell, and the guide post penetrates the upper shell and is slidably connected inside the limiting tube.

[0012] Preferably, the driving structure includes a spring, an electromagnet, and a magnetic block. A base is welded to the middle of the upper shell, the spring is sleeved on the outside of the base, the electromagnet is fixed inside the base, a rod is welded to the bottom of the floating plate, the magnetic block is fixed to the bottom of the rod, and the rod is slidably connected inside the base.

[0013] Preferably, the upper surface of the bottom shell is provided with an integrally formed protrusion, and the lower surface of the upper shell is provided with a groove, wherein the outer wall of the protrusion fits into the inner wall of the groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention uses filter paper placed between adjacent battery modules. Under normal operating conditions, the filter paper remains breathable, avoiding the obstruction of heat conduction by traditional fireproof partitions and ensuring efficient heat dissipation of the battery. When the smoke sensor detects a fire, the drive structure quickly triggers the fireproof coating injection system. Polyurethane fireproof foam fills the gaps in the filter paper through the injection nozzle, forming a flame-retardant isolation layer that slows down the spread of fire. Compared to directly fixing fireproof materials between battery modules, this device does not affect the heat dissipation of the modules during normal use and is suitable for harsh environments such as electric vehicles and energy storage power stations. Attached Figure Description

[0016] Figure 1 This is an exploded structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the fire-retardant coating injection structure of this utility model;

[0018] Figure 3 This is a schematic diagram showing the position of the injection nozzle of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the waterproof and breathable membrane body of this utility model;

[0020] Figure 5 This is a schematic diagram of the drive structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the filter paper of this utility model.

[0022] In the diagram: 1. Bottom shell; 2. Top shell; 3. Floating plate; 4. Battery module; 5. Sinking groove; 6. Guide structure; 7. Drive structure; 8. Fire retardant coating injection structure; 801. Smoke sensor; 802. Injection machine; 803. Injection nozzle; 804. Slot; 805. Rubber pad; 806. Cross cut; 807. Waterproof and breathable membrane body; 808. Filter paper; 8021. Injection pump; 8022. Polyurethane fire retardant foam storage tank; 601. Guide post; 602. Limiting tube; 701. Spring; 702. Electromagnet; 703. Magnetic block; 704. Base; 705. Insert rod; 9. Protruding edge; 10. Groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 This utility model provides a technical solution: a sealed compartment for a power battery pack with a waterproof and breathable membrane, including a bottom shell 1, an upper shell 2 and a floating plate 3. The bottom shell 1 and the upper shell 2 are fixedly connected by screws. A battery module 4 is fixed inside the bottom shell 1. A sinking groove 5 for placing the floating plate 3 is opened on the upper surface of the upper shell 2. A guide structure 6 for restricting the floating plate 3 is provided on the outside of the bottom shell 1. A driving structure 7 for driving the floating plate 3 to float is provided inside the upper shell 2. A fireproof coating injection structure 8 is fixed on the top of the floating plate 3.

[0025] The battery module 4 is sealed between the upper shell 2 and the bottom shell 1. The floating plate 3 is set on the upper shell 2. When the battery module 4 catches fire, the drive structure 7 drives the floating plate 3 to descend in preparation for the injection of fireproof coating.

[0026] The fireproof coating injection structure 8 includes a smoke sensor 801, an injection machine 802, and an injection nozzle 803. The sinking groove 5 is provided with a slot 804 for the injection nozzle 803 to pass through the upper shell 2. A rubber pad 805 is glued into the slot 804. A cross-shaped cut 806 is opened in the middle of the rubber pad 805. A waterproof and breathable membrane body 807 is provided between the slot 804 and the floating plate 3.

[0027] The waterproof and breathable membrane body 807 is bonded between the floating plate 3 and the slot 804 of the upper shell 2. The waterproof and breathable membrane body 807 is arranged in a ring shape, which not only achieves IP67 level waterproof and dustproof sealing, but also balances the air pressure inside and outside the cabin through the microporous structure, avoiding structural deformation caused by thermal expansion.

[0028] The cross-shaped cutout 806 and rubber gasket 805 at the injection nozzle 803 remain sealed when not injecting material. When fire-retardant coating is injected, the rubber gasket opens due to elastic deformation and automatically resets after injection, thus improving the reliability of the seal.

[0029] The fireproof coating injection structure 8 also includes filter paper 808. Two sets of injection nozzles 803 are provided. There are two pieces of filter paper 808 fixed between adjacent battery modules 4. The injection nozzle 803 is located above the gap between the two pieces of filter paper 808.

[0030] Filter paper 808 is installed between adjacent battery modules 4. Under normal operating conditions, the filter paper 808 maintains air permeability, avoiding the obstruction of heat conduction by traditional fireproof partitions and ensuring efficient heat dissipation of the battery. When polyurethane fireproof foam is injected into the gap between two filter papers 808, the filter paper 808 can limit the spread of polyurethane fireproof foam to other places, thereby facilitating the maintenance of battery module 4.

[0031] The waterproof and breathable membrane body 807 is arranged in a ring shape. The bottom end of the waterproof and breathable membrane body 807 is bonded to the inner wall of the slot 804, and the top end of the waterproof and breathable membrane body 807 is bonded to the bottom of the floating plate 3.

[0032] The injection machine 802 includes an injection pump 8021 and a polyurethane fireproof foam storage tank 8022. The injection pump 8021 and the polyurethane fireproof foam storage tank 8022, as well as the injection pump 8021 and the injection nozzle 803, are all connected by pipes.

[0033] The guide structure 6 includes a guide post 601 and a limiting tube 602. The guide post 601 is welded to the bottom of the floating plate 3, and the limiting tube 602 is welded to the outer wall of the bottom shell 1. The guide post 601 penetrates the upper shell 2 and is slidably connected inside the limiting tube 602.

[0034] The driving structure 7 includes a spring 701, an electromagnet 702, and a magnetic block 703. A base 704 is welded to the middle of the upper shell 2. The spring 701 is sleeved on the outside of the base 704. The electromagnet 702 is fixed inside the base 704. A rod 705 is welded to the bottom of the floating plate 3. The magnetic block 703 is fixed to the bottom of the rod 705. The rod 705 is slidably connected inside the base 704.

[0035] The electromagnet 702 and spring 701 work together to ensure that the floating plate 3 is raised quickly in case of fire; the guide post 601 of the guide structure 6 cooperates with the limiting tube 602 to prevent the floating plate 3 from deviating and getting stuck.

[0036] The upper surface of the bottom shell 1 is provided with an integrally formed protruding edge 9, and the lower surface of the upper shell 2 is provided with a groove 10, with the outer wall of the protruding edge 9 fitting against the inner wall of the groove 10.

[0037] In use, the smoke sensor 801 at the bottom of the upper shell 2 detects smoke particles generated by the combustion of the battery module 4 inside the lower shell 1. The main control board controls the injection electromagnet 702 to engage with the magnetic block 703, causing the floating plate 3 to lower the injection nozzle 803. The injection nozzle 803 is inserted into the cross-shaped cut 806 and located in the cavity between the lower shell 1 and the upper shell 2. The main control board controls the injection pump 8021 to inject polyurethane fireproof foam into the gap between the two layers of filter paper 808. After contacting the air in the cavity, the polyurethane fireproof foam solidifies between the two layers of filter paper 808, separating the battery module 4 and thus extending the flame barrier time of the module. Compared with directly fixing fireproof material between the battery modules 4, this device does not affect the heat dissipation of the module when the battery module 4 is in normal use, and is suitable for harsh environments such as electric vehicles and energy storage power stations.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power battery pack sealed cabin body with a waterproof and breathable film, characterized in that: Including bottom shell (1), upper shell (2) and floating plate (3), the bottom shell (1) is fixedly connected with the upper shell (2) by screw, the battery module (4) is fixedly arranged in the bottom shell (1), the upper surface of the upper shell (2) is provided with the sinking groove (5) for placing the floating plate (3), the outer portion of the bottom shell (1) is provided with the guide structure (6) for limiting the floating plate (3), the upper shell (2) is provided with the drive structure (7) for driving the floating plate (3) to float, the top of the floating plate (3) is fixed with the fireproof paint injection structure (8); The fireproof paint injection structure (8) includes a smoke sensor (801), an injection machine (802) and an injection nozzle (803), the sinking groove (5) is provided with a groove hole (804) for the injection nozzle (803) to penetrate the upper shell (2), the groove hole (804) is glued with a rubber pad (805), the middle portion of the rubber pad (805) is provided with a cross cut (806), and the groove hole (804) and the floating plate (3) are provided with a waterproof and breathable film body (807).

2. The power battery pack sealed cabin body with waterproof and breathable film according to claim 1, characterized in that: The fireproof paint injection structure (8) further includes filter paper (808), the injection nozzle (803) is provided with two groups, the filter paper (808) fixed between adjacent battery modules (4) is two pieces, and the injection nozzle (803) is located above the gap between the two pieces of filter paper (808).

3. The power battery pack sealed cabin body with waterproof and breathable film according to claim 2, characterized in that: The waterproof and breathable film body (807) is annularly arranged, the bottom end of the waterproof and breathable film body (807) is glued with the inner wall of the groove hole (804), and the top end of the waterproof and breathable film body (807) is glued with the bottom of the floating plate (3).

4. The power battery pack sealed cabin body with waterproof and breathable film according to claim 3, characterized in that: The injection machine (802) includes an injection pump (8021) and a polyurethane fireproof foam storage tank (8022), and the injection pump (8021) and the polyurethane fireproof foam storage tank (8022) are connected by a pipeline, and the injection pump (8021) and the injection nozzle (803) are connected by a pipeline.

5. The power battery pack sealed cabin body with waterproof and breathable film according to claim 4, characterized in that: The guide structure (6) includes a guide column (601) and a limiting tube (602), the guide column (601) is welded at the bottom of the floating plate (3), the limiting tube (602) is welded on the outer wall of the bottom shell (1), and the guide column (601) penetrates the upper shell (2) and is slidingly connected in the limiting tube (602).

6. The power battery pack sealed cabin body with waterproof and breathable film according to claim 5, characterized in that: The drive structure (7) includes a spring (701), an energized magnet (702) and a magnetic suction block (703), a base (704) is welded in the middle of the upper shell (2), the spring (701) is sleeved outside the base (704), the energized magnet (702) is fixed in the base (704), a plug rod (705) is welded at the bottom of the floating plate (3), the magnetic suction block (703) is fixed at the bottom of the plug rod (705), and the plug rod (705) is slidingly connected in the base (704).

7. The power battery pack sealed cabin body with waterproof and breathable film according to claim 1, characterized in that: The upper surface of the bottom shell (1) is provided with an integrally formed flange (9), the lower surface of the upper shell (2) is provided with a groove (10), and the outer wall of the flange (9) is attached to the inner wall of the groove (10).

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