Whole pack grade thermal protection battery pack

Abstract

The utility model relates to the technical field of whole-pack-level thermal protection, in particular to a whole-pack-level thermal protection battery pack which comprises a box body and a box cover connected with the top of the box body in a sealing mode, a plurality of supporting beams are arranged in the box body and form a plurality of mounting grooves, battery modules are arranged in the mounting grooves, and the battery modules are connected with the box cover in a sealing mode. A silicon carbide ceramic plate is arranged above the battery modules, the silicon carbide ceramic plate is detachably and fixedly connected with the supporting beam, and the silicon carbide ceramic plate covers the upper surfaces of all the battery modules. After thermal runaway protection of the module fails, flame is blocked below the box cover, high-temperature jet flow is prevented from directly spraying to the box cover, flame escape is effectively prevented or reduced, and the safety of a battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of whole-pack-level thermal protection, in particular to a whole-pack-level thermal protection battery pack. Background Art

[0002] Current PACK thermal protection structures are broadly divided into two levels: module-level thermal runaway protection and whole-pack thermal protection. Whole-pack protection primarily involves isolating high-temperature flames within the battery pack or discharging them toward a designed high-temperature exhaust path in the event of thermal runaway. This keeps the entire thermal runaway process under control and prevents it from spreading.

[0003] The main difficulty in whole-pack-level thermal protection lies in thermal runaway. For example, when a high-temperature jet with an instantaneous temperature of up to 1200°C from a ternary battery cell is ejected upward, it first impacts the module cover with high temperature. Even if the module cover is made of flame-retardant material, such as ceramic fiberglass cloth, which can temporarily withstand flame erosion, the module cover fixing structure will usually be damaged, the flame-retardant components will be displaced, and the protective effect will be lost. There will be no barrier between the box cover and the runaway battery cell, and the high-temperature jet will be sprayed directly onto the box cover. Even if the box cover is made of flame-retardant and fireproof material, the temperature of the cold surface may be as high as several hundred degrees. As the pressure in the package increases, the explosion-proof valve will lose its effective discharge capacity, the high temperature and high pressure will destroy the sealing structure of the box cover, and flames will burst out from all directions, endangering the safety of people and property.

[0004] Chinese utility model patent authorization number CN210134052U discloses a high-temperature, fire-resistant, and impact-resistant pad that effectively reduces the impact force generated by high-temperature, high-pressure gas inside the battery compartment, acting as a buffer and preventing it from breaking through the insulation layer, thus protecting it. The quartz layer can withstand temperatures up to 1710°C, providing fire and high-temperature resistance during use. However, this high-temperature, fire-resistant, and impact-resistant pad has limited protective effect on the compartment lid. The high-temperature jet can impact the compartment lid, causing the lid seal to fail and allowing flames to easily spread, endangering personal and property safety. Utility Model Content

[0005] The purpose of this utility model is to address the defects of the existing technology and provide a whole-pack thermal protection battery pack. After the module thermal runaway protection fails, the flame is blocked below the box cover to prevent the high-temperature jet from directly spraying the box cover, effectively preventing or reducing the flame from escaping, and improving the safety of the battery pack.

[0006] In order to solve the above technical problems, the utility model provides a whole-pack-level thermal protection battery pack, including a box body and a box cover sealed to the top of the box body, a plurality of support beams are arranged in the box body, and the plurality of support beams form a plurality of mounting grooves, in which battery modules are arranged, and a silicon carbide ceramic plate is arranged above the battery module, and the silicon carbide ceramic plate is detachably fixedly connected to the support beam, and the silicon carbide ceramic plate covers the upper surface of all battery modules.

[0007] In some embodiments, a first flexible layer is provided between the silicon carbide ceramic plate and the battery module.

[0008] In some embodiments, a second flexible layer is provided between the silicon carbide ceramic plate and the box cover.

[0009] In some embodiments, a plurality of threaded holes are provided on the support beam, a plurality of mounting holes are provided on the silicon carbide ceramic plate, a screw is provided in the mounting hole, a support table is provided on the screw, and the support table is used to support the silicon carbide ceramic plate, the lower end of the screw is connected to the threaded hole, the upper end of the screw passes through the mounting hole and is provided with a nut, and the nut is used to fix the silicon carbide ceramic plate on the support table.

[0010] Furthermore, a rubber bushing is provided on the mounting hole.

[0011] Furthermore, the rubber bushing is clearance-matched with the hole wall of the mounting hole.

[0012] In some embodiments, the nut is a flange nut.

[0013] Furthermore, thread glue is coated on the threads of the nut.

[0014] In some embodiments, the box body includes side beams, the box body is sealed to the box cover through the side beams, the upper surface of the silicon carbide ceramic plate is lower than the upper surface of the side beams of the box body, and the end face of the silicon carbide ceramic plate is arranged in a gap with the side beams.

[0015] In some embodiments, a flange is provided at the end of the silicon carbide ceramic plate, and the flange is arranged on one side of the battery module.

[0016] The beneficial effects of the utility model are:

[0017] 1. This utility model uses silicon carbide ceramic plates to separate the battery modules from the cover and cover the top surface of all battery modules. Silicon carbide ceramics possess excellent mechanical properties, including superior oxidation resistance, corrosion resistance, high wear resistance, and ultra-high temperature resistance, maintaining good mechanical properties even at temperatures of 1400°C. In the event of thermal runaway of the battery cells, the high-temperature jet will impact the silicon carbide ceramic plates, maintaining structural stability and effectively preventing or reducing flames from erupting in the event of a cover seal failure.

[0018] 2. The utility model can prevent the silicon carbide ceramic plate from being brittle and cracked due to excessive amplitude by providing a first flexible layer. By providing a second flexible layer, the utility model can prevent the silicon carbide ceramic plate from colliding with the rigid body of the box cover during vibration, which may lead to the risk of the silicon carbide ceramic plate being broken or the box cover being damaged.

[0019] 3. The utility model provides a rubber bushing on the mounting hole, and leaves a certain gap between the rubber bushing and the hole wall of the mounting hole, thereby ensuring effective support while preventing the entire package from plastically deforming and pulling the ceramic plate during vibration, causing damage.

[0020] 4. The silicon carbide ceramic plate of the present invention is lower than the upper surface of the box side beam and the gap with the box side beam is reduced as much as possible, which is beneficial to improving the fire prevention effect.

[0021] 5. The silicon carbide ceramic plate of the present invention can further improve the fireproof effect and avoid impact on the box cover by providing a flange.

[0022] 6. The utility model can prevent the nut from loosening by applying thread glue on the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an exploded view of the utility model;

[0024] Figure 2 This is a schematic diagram of the connection structure between the silicon carbide ceramic plate and the support beam of the utility model;

[0025] Figure 3 It is a top view of the utility model;

[0026] Figure 4 for Figure 3 Middle AA cross-section.

[0027] Reference numerals: box body 1; support beam 2; battery module 3; silicon carbide ceramic plate 4; first flexible layer 5; second flexible layer 6; screw 7; rubber bushing 8; nut 9; side beam 10; threaded hole 11; support table 12. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a whole-pack thermal protection battery pack, including a box body 1 and a box cover sealed with the top of the box body 1. Figure 1 The box cover is not shown.

[0031] A plurality of support beams 2 are welded and fixed in the box body 1. The plurality of support beams 2 include mutually perpendicular horizontal beams and longitudinal beams. The mutually perpendicular horizontal beams and longitudinal beams form four mounting grooves. The battery modules 3 are arranged in the mounting grooves. A plurality of threaded holes 11 are provided at the top of the support beams 2.

[0032] A silicon carbide ceramic plate 4 is positioned above the battery module 3. Multiple mounting holes are defined in the plate 4, corresponding one-to-one with threaded holes 11. Screws 7 are positioned within the mounting holes, and a support surface 12 is integrally formed on the screws 7. This support surface 12 supports the plate 4. The lower end of the screws 7 connects to the threaded holes 11, and a nut 9 is positioned at the upper end of the screws 7, securing the plate 4 to the support surface 12. The plate 4 covers the entire upper surface of the battery module 3. In this embodiment, the nuts 9 are flange-mounted nuts 9, and the threads of the nuts 9 are coated with thread glue.

[0033] It should be noted that silicon carbide ceramics possess excellent mechanical properties, including superior oxidation resistance, corrosion resistance, high wear resistance, and ultra-high temperature resistance. They maintain good mechanical properties even at temperatures of 1400°C. In the event of thermal runaway of the battery cell, the high-temperature jet will impact the silicon carbide ceramic plate 4, which maintains structural stability and effectively blocks or reduces flames from a failure of the cover seal.

[0034] like Figure 2 As shown, a rubber bushing 8 is provided on the mounting hole, and the rubber bushing 8 is in clearance with the hole wall of the mounting hole. While ensuring effective support, it can prevent the entire package from plastically deforming and pulling the ceramic plate during vibration, causing damage.

[0035] like Figure 1 As shown, a first flexible layer 5 is provided between the silicon carbide ceramic plate 4 and the battery module 3, and a second flexible layer 6 is provided between the silicon carbide ceramic plate 4 and the box cover. The first flexible layer 5 prevents the silicon carbide ceramic plate 4 from cracking due to excessive vibration amplitude, while the second flexible layer 6 prevents the silicon carbide ceramic plate 4 from colliding with the rigid body of the box cover during vibration, which could result in the risk of cracking the silicon carbide ceramic plate 4 or damaging the box cover.

[0036] like Figure 3 、 4 As shown, the box body 1 includes a side beam 10, and the box body 1 is sealed to the box cover through the side beam 10. The upper surface of the silicon carbide ceramic plate 4 is lower than the upper surface of the side beam 10 of the box body 1, and a gap is arranged between the end face of the silicon carbide ceramic plate 4 and the side beam 10, that is, the gap between the silicon carbide ceramic plate 4 and the side beam 10 of the box body 1 is reduced as much as possible, which can improve the fire prevention effect.

[0037] Example 2

[0038] Compared with Example 1, the difference of Example 2 is only the structure of the silicon carbide ceramic plate 4. The end of the silicon carbide ceramic plate 4 in this embodiment is provided with a flange, that is, Figure 4 In the embodiment, the end of the silicon carbide ceramic plate 4 is further provided with a downward vertically arranged flange, which is arranged on one side of the battery module 3 and can cover the battery module 3 to achieve the best fire prevention effect.

[0039] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A whole-pack thermal protection battery pack, characterized by: The invention comprises a box body (1) and a box cover sealedly connected to the top of the box body (1); a plurality of support beams (2) are arranged in the box body (1); the plurality of support beams (2) form a plurality of mounting grooves; battery modules (3) are arranged in the mounting grooves; a silicon carbide ceramic plate (4) is arranged above the battery module (3); the silicon carbide ceramic plate (4) is detachably fixedly connected to the support beams (2); and the silicon carbide ceramic plate (4) covers the upper surfaces of all battery modules (3).

2. The whole-pack thermal protection battery pack according to claim 1, characterized in that: A first flexible layer (5) is provided between the silicon carbide ceramic plate (4) and the battery module (3).

3. The whole-pack thermal protection battery pack according to claim 1, characterized in that: A second flexible layer (6) is provided between the silicon carbide ceramic plate (4) and the box cover.

4. The whole-pack thermal protection battery pack according to any one of claims 1 to 3, characterized in that: A plurality of threaded holes (11) are provided on the support beam (2), a plurality of mounting holes are provided on the silicon carbide ceramic plate (4), a screw rod (7) is provided in the mounting hole, a support table (12) is provided on the screw rod (7), the support table (12) is used to support the silicon carbide ceramic plate (4), the lower end of the screw rod (7) is connected to the threaded hole (11), the upper end of the screw rod (7) passes through the mounting hole and is provided with a nut (9), the nut (9) is used to fix the silicon carbide ceramic plate (4) on the support table (12).

5. The whole-pack thermal protection battery pack according to claim 4, characterized in that: A rubber bushing (8) is provided on the mounting hole.

6. The whole-pack thermal protection battery pack according to claim 5, characterized in that: The rubber bushing (8) is clearance-matched with the hole wall of the mounting hole.

7. The whole-pack thermal protection battery pack according to claim 4, characterized in that: The nut (9) is a flange nut (9).

8. The whole-pack thermal protection battery pack according to claim 7, characterized in that: The threads of the nut (9) are coated with thread glue.

9. The whole-pack thermal protection battery pack according to any one of claims 1 to 3, characterized in that: The box body (1) includes a side beam (10), the box body (1) is sealed and connected to the box cover via the side beam (10), the upper surface of the silicon carbide ceramic plate (4) is lower than the upper surface of the side beam (10) of the box body (1), and the end surface of the silicon carbide ceramic plate (4) is arranged with a gap between it and the side beam (10).

10. The whole-pack thermal protection battery pack according to any one of claims 1 to 3, characterized in that: The end of the silicon carbide ceramic plate (4) is provided with a flange, and the flange is arranged on one side of the battery module (3).

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