Battery case gas-discharging structure and battery case

Abstract

A battery case gas-discharging structure and a battery case. The battery case gas-discharging structure comprises: a support main body (1), which has a gas-discharging cavity (11), wherein one end of the support main body is configured to be connected to the battery case, a side gas inlet hole (114) is formed in the side wall of the support main body, and the side gas inlet hole (114) is communicated with the battery case; and a sealing cover (2), which is sealingly assembled to the other end of the support main body (1), wherein a gas-discharging hole (24) is formed in the sealing cover (2), and the gas-discharging hole (24) is communicated with the exterior of the cavity of the battery case. Gas generated by foaming is discharged by means of the gas-discharging hole (24), thereby reducing voids in the battery case.

Description

A battery box exhaust structure and a battery box

[0001] This application claims priority to Chinese Patent Application No. 202421225051.X, filed with the Chinese Patent Office on May 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery venting technology, and in particular to a battery housing venting structure and a battery housing. Background Technology

[0003] In the battery pack manufacturing industry, foaming technology is widely used to improve the sealing, heat insulation, and mechanical strength of battery packs. Currently, the mainstream battery pack foaming methods mainly include external foaming of the module and non-fully encapsulated foaming of the entire pack. These foaming methods typically involve foaming in specific areas of the module or battery pack, eliminating the need to consider gas emissions during the foaming process, as they are usually carried out in open or semi-open environments.

[0004] However, with the continuous development of battery pack design and manufacturing technology, fully encapsulated foaming technology has gradually attracted attention. Fully encapsulated foaming technology aims to provide a more uniform and complete sealing and insulation effect by fully injecting foaming material inside the battery pack. Invention Overview

[0005] In the manufacturing process of fully encapsulated foamed battery packs, once the cover is attached, a sealed space is formed inside the battery pack. Within this space, the foaming material generates gas during the curing reaction. Because the battery pack interior is sealed, this gas cannot escape naturally, resulting in cavitation bubbles at the bottom of the cover. These bubbles not only affect the overall aesthetics of the battery pack, but more importantly, they can damage the adhesive structure between the cover and the casing, weakening the battery pack's sealing performance and impacting its safety.

[0006] This application provides a battery box exhaust structure, comprising: a supporting body having an exhaust chamber, one end of the supporting body being connected to the bottom wall of the battery box cavity, and a side air inlet communicating with the exhaust chamber on the side wall of the supporting body; and a sealing cover sealingly assembled with the other end of the supporting body, the sealing cover having an exhaust hole communicating with the exhaust chamber and the exhaust hole communicating with the outside of the battery box cavity.

[0007] This application also provides a battery housing, including a bottom protective plate, a side beam frame, a battery cover, a middle beam, and a battery housing exhaust structure. The side beam frame is assembled around the edge of the bottom protective plate to form a battery compartment. The battery cover is placed on the battery compartment. The middle beam is disposed inside the battery compartment and fixedly connected to the bottom protective plate. The battery cover has a through hole, and a sealing cover part passes through the through hole and is connected to the support body on the middle beam. Beneficial effects

[0008] The mounting bracket provided in this application is a battery box exhaust structure. The gas generated by foaming can enter the exhaust chamber through the side air inlet and be discharged through the exhaust hole of the sealing cover. Therefore, it reduces the cavitation in the battery box, reduces the space occupied inside the battery box, makes the battery box airtight and waterproof, and enhances the structural stability and impact resistance of the battery pack.

[0009] The battery box provided in this application can achieve air venting effect through the side air inlet and outlet of the supporting body in the fully encapsulated foam battery box, thereby reducing air bubbles under the battery cover, increasing the bonding area of ​​the battery cover, and improving the overall strength of the battery pack; at the same time, the supporting body also serves to support the battery cover, reducing the number of parts for fixing the battery cover, thereby reducing the cost of parts. Attached Figure Description

[0010] Figure 1 is a schematic diagram of a partial explosion structure according to an embodiment of this application;

[0011] Figure 2 is a schematic diagram of the dissected surface structure of an embodiment of this application;

[0012] Figure 3 is a schematic diagram of a partial explosion of the battery box structure according to an embodiment of this application;

[0013] Figure 4 is a schematic diagram of the internal structure of the battery box according to an embodiment of this application;

[0014] Figure 5 is a schematic diagram of the venting structure assembly inside the battery box according to an embodiment of this application.

[0015] Figure label:

[0016] 1. Support body; 11. Exhaust chamber; 111. Cavity; 112. Sealing chamber; 113. Connecting chamber; 1131. Internal thread; 114. Side air inlet; 12. Lip plate; 121. Sealing groove; 122. Sealing element; 13. Assembly platform; 131. Adhesive layer; 2. Sealing cover; 21. Sealing section; 211. Annular groove; 212. Sealing ring; 22. Fixing section; 221. External thread; 23. Operating section; 231. Cover plate; 232. Boss; 233. Operating flat position; 24. Exhaust hole; 3. Intermediate beam; 4. Battery cover plate; 41. Perforation; 5. Bottom protective plate; 6. Side beam frame; 7. Battery compartment. Embodiments of the present invention

[0017] In the description of this application, unless otherwise expressly 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 application according to the specific circumstances.

[0018] In this application, unless otherwise expressly 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 being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used 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 application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0020] Embodiment 1 of this application, as shown in Figures 1, 2, and 5, discloses a battery box exhaust structure, including a support body 1 and a sealing cover 2. The support body 1 has an exhaust chamber 11, and one end of the support body 1 is used to connect to the bottom wall of the cavity inside the battery box. Of course, a middle beam 3 can also be provided on the bottom wall of the cavity inside the battery box, and one end of the support body 1 can also be connected to the middle beam 3. The middle beam 3 is hollow inside to reduce its own weight. The side wall of the support body 1 is provided with a side air inlet 114 communicating with the exhaust chamber 11. The side air inlet 114 is connected to the cavity of the battery box for drawing in the filling material inside the battery box. The sealing cover 2 is sealed to the other end of the support body 1 to seal the gas generated by the foam. It is used to assemble and connect the support body 1 and the sealing cover 2 to the battery cover plate 4 of the battery box. The sealing cover 2 is provided with an exhaust hole 24 that communicates with the exhaust chamber 11. The exhaust hole 24 communicates with the outside of the cavity of the battery box and is used to discharge the gas that enters the exhaust chamber 11 from the side air inlet 114. Since the gas generated by foaming can enter the exhaust chamber 11 from the side air inlet 114 and be discharged through the exhaust hole 24 of the sealing cover 2, the air bubbles inside the fully encapsulated foam battery box can be discharged, thus reducing the cavitation inside the battery box.

[0021] In some embodiments, to increase the contact area between the support body 1 and the battery cover 4, a lip plate 12 extending outward from the vent 24 is provided at the other end of the support body 1. The surface of the lip plate 12 facing the sealing cover 2 has a sealing groove 121 that surrounds the vent 24. A sealing element 122 is provided within the sealing groove 121. The design of the lip plate 12 and the sealing groove 121 increases the support area between the support body 1 and the battery cover, improving the connection stability between the sealing cover 2 and the support body 1 through the battery cover. Preferably, the sealing element 122 is made of sealing foam. The presence of the sealing foam provides a certain buffering effect, reducing the risk of damage caused by vibration or impact.

[0022] To improve the connection stability and airtightness between the sealing cap 2 and the support body 1, in some embodiments, the sealing cap 2 sequentially includes a sealing section 21, a fixing section 22, and an operating section 23 from one end to the other. The exhaust chamber 11 of the support body 1 sequentially includes a cavity 111, a sealing cavity 112, and a connecting cavity 113 from one end to the other. Therefore, when the sealing cap 2 is assembled into the exhaust chamber 11, the sealing section 21 corresponds to the sealing cavity 112, and the fixing section 22 corresponds to the connecting cavity 113. Specifically, the sealing section 21 is circumferentially provided with an annular groove 211, and a sealing ring 212 is provided within the annular groove 211. The sealing ring 212 is preferably an O-ring, and the sealing ring 212 abuts against the cavity wall of the sealing cavity 112. The fixing section 22 is circumferentially provided with an external thread 221, and the connecting cavity 11... 3 is provided with an internal thread 1131 for connecting with the external thread 221 of the fixed section 22; the operating section 23 includes a cover plate 231, which abuts against the lip plate 12; one end of the cavity 111 abuts against the intermediate beam 3, and the side air inlet 114 is circumferentially arranged at the other end of the cavity 111. Thus, the sealing section 21 can ensure the sealing effect between the sealing cover 2 and the support body 1, and can realize the connection and fixation effect between the sealing cover 2 and the support body 1. The operating section 23 facilitates the operation of the sealing cover 2, thereby completing the threaded connection between the fixed section 22 and the connecting cavity 113 of the support body 1, which can complete the connection and fixation of the two, and is easy to cut and disassemble. The sealing cavity 112 can seal with the sealing section 21, ensuring the airtightness of the connection between the cavity 111 and the exhaust cavity 11 and the side exhaust cavity 11.

[0023] It should be noted that, in some embodiments, the diameter of the wall of the sealing cavity 112 is equal to the diameter of the wall of the empty cavity 111, and the diameter of the wall of the connecting cavity 113 is greater than the diameter of the wall of the sealing cavity 112. This allows for smooth insertion of the sealing cover 2 into the exhaust cavity 11, which is beneficial for the assembly between the sealing cover 2 and the support body 1.

[0024] To improve the assembly stability of the support body 1, in some embodiments, an assembly platform 13 extending outward from the exhaust chamber 11 is provided at one end of the support body 1, and the assembly platform 13 is fitted and connected to the intermediate beam 3. Preferably, the support platform is inclined or arc-shaped, which helps to improve the support stability between the support body 1 and the intermediate beam 3. An adhesive layer 131 is provided between the edge of the assembly platform 13 and the intermediate beam 3, which improves the connection stability and airtightness between the support body 1 and the assembly platform 13. This arrangement increases the contact area between the support body 1 and the assembly platform 13, thereby improving the support stability of the support body 1 and increasing its own strength.

[0025] In some embodiments, optionally, a boss 232 is provided on the surface of the cover plate 231 away from the exhaust chamber 11. The boss 232 is provided with an operating flat position 233, which facilitates the user to drive the cover plate 231 to rotate, thereby driving the sealing cover 2 to rotate and complete the threaded connection with the support body 1. There are two or more operating flat positions 233, so that the boss 232 is shaped like a triangular prism, square prism, pentagonal prism, hexagonal prism, etc. with rounded corners. In other embodiments, the boss 232 can also be in the shape of a straight line, cross, plum blossom, or column with anti-slip texture on the edge, as long as it is convenient for the user to operate.

[0026] Referring to Figures 3-5, this application also relates to a battery housing, including a bottom protective plate 5, a side beam frame 6, a battery cover 4, a middle beam 3, and a battery housing venting structure. The side beam frame 6 is assembled around the edge of the bottom protective plate 5 to form a battery compartment 7. The battery cover 4 is placed over the battery compartment 7. The middle beam 3 is disposed inside the battery compartment 7 and fixedly connected to the bottom protective plate 5. The battery cover 4 has a through hole 41, and a sealing cover 2 is partially inserted through the through hole 41 and connected to a support body 1 on the middle beam 3. The middle beam 3 has two or more support bodies 1, each support body 1 corresponding to one through hole 41 and one sealing cover 2. In some embodiments, there are two of each of the support body 1, the perforation 41, and the sealing cover 2. This configuration allows for air venting within the fully encapsulated foam battery pack through the side air inlet 114 and the exhaust vent 24 of the support body 1, reducing air bubbles under the battery cover 4, increasing the bonding area of ​​the battery cover 4, and improving the overall strength of the battery pack. At the same time, the support body 1 also serves to support the battery cover 4, reducing the number of components needed to fix the battery cover 4, thereby reducing component costs.

[0027] It should be noted that in other embodiments, the number of intermediate beams 3 can be increased, thereby increasing the number of supporting bodies 1 assembled. This can complete the gas emission of multiple parts after the battery compartment 7 is filled with foam, and increase the exhaust volume of the foam. The number of beams can be increased or decreased according to the actual situation.

[0028] In summary, the battery box exhaust structure and battery box provided in this application have the following technical advantages:

[0029] 1. After the battery box is filled with expanding foam, the air bubbles generated by the expanding foam can enter the exhaust chamber 11 through the side air inlet of the support body 1, and then be discharged through the exhaust hole 24 of the sealing cover 2. This avoids the problem of air bubbles forming in the battery box due to the inability of gas to be discharged. This not only improves the sealing performance of the battery box, but also enhances the overall strength of the battery pack.

[0030] 2. When the gas in the foam is exhausted or no gas is produced, the foam will enter the side air inlet of the supporting body 1, thereby blocking the side air inlet and part of the exhaust chamber 11, thus achieving a sealed space inside the battery box.

[0031] 3. Because the battery box exhaust structure can effectively expel internal gas, it reduces air bubbles inside the battery box, reduces the space occupied inside the battery box, makes the battery box airtight and waterproof, and enhances the structural stability and impact resistance of the battery pack.

[0032] The technical means disclosed in this application are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A battery box exhaust structure, comprising: a support body (1) having an exhaust cavity (11), one end of the support body (1) being configured to connect with a cavity bottom wall of a battery box, a side wall of the support body (1) being provided with a side air inlet hole (114) in communication with the exhaust cavity (11), the side air inlet hole (114) being in communication with a cavity of the battery box; a sealing cover (2) sealingly fitted with the other end of the support body (1), the sealing cover (2) being provided with an exhaust hole (24) in communication with the exhaust cavity (11), the exhaust hole (24) being in communication with the outside of the cavity of the battery box.

2. The battery case exhaust structure according to claim 1, wherein The other end of the support body (1) is provided with a lip plate (12) extending outwardly to the exhaust hole (24), a sealing groove (121) around the exhaust hole (24) is arranged on the surface of the lip plate (12) facing the sealing cover (2), and a sealing element (122) is arranged in the sealing groove (121).

3. The battery case exhaust structure according to claim 2, wherein The sealing cover (2) sequentially comprises, from one end to the other end: a sealing section (21) provided with an annular groove (211) in the circumferential direction, and a sealing ring (212) is arranged in the annular groove (211), the sealing ring (212) abutting against a cavity wall of the exhaust cavity (11); a fixing section (22) provided with an external thread (221) in the circumferential direction; an operation section (23) comprising a cover plate (231) abutting against the lip plate (12).

4. The battery case exhaust structure according to claim 3, wherein The exhaust cavity (11) of the support body (1) sequentially comprises, from one end to the other end: a hollow cavity (111) having one end abutting against the intermediate beam (3), and the side air inlet hole (114) being arranged in the circumferential direction at the other end of the hollow cavity (111); a sealing cavity (112) sealingly connected with the sealing ring (212) of the sealing section (21); a connecting cavity (113) provided with an internal thread (1131) for connecting with the external thread (221) of the fixing section (22).

5. The battery case exhaust structure according to claim 4, wherein The cavity wall diameter of the sealing cavity (112) is equal to the cavity wall diameter of the hollow cavity (111), and the cavity wall diameter of the connecting cavity (113) is greater than the cavity wall diameter of the sealing cavity (112).

6. The battery case exhaust structure according to any one of claims 1 to 5, characterized by One end of the support body (1) is provided with a fitting platform (13) extending outwardly to the exhaust cavity (11), and the fitting platform (13) is connected with the intermediate beam (3) in a fit manner.

7. The battery case exhaust structure according to claim 6, wherein A glue layer (131) is arranged between the edge of the fitting platform (13) and the intermediate beam (3).

8. The battery case exhaust structure according to claim 3, wherein The surface of the cover plate (231) away from the exhaust cavity (11) is provided with a boss (232), and the boss (232) is provided with an operation flat position (233).

9. A battery box comprising a bottom guard plate (5), a side beam frame (6), a battery cover plate (4), a middle beam (3) and a battery box exhaust structure according to any one of claims 1-8, the side beam frame (6) enclosing the bottom guard plate (5) to form a battery compartment (7), the battery cover plate (4) being arranged on the battery compartment (7), the middle beam (3) being arranged in the battery compartment (7) and fixedly connected with the bottom guard plate (5), the battery cover plate (4) being provided with a through hole (41), and the sealing cover (2) being partially arranged in the through hole (41) and connected with the support main body (1) on the middle beam (3).

10. The battery pack of claim 9, wherein, The middle beam (3) is provided with two or more support main bodies (1), each support main body (1) corresponding to one through hole (41) and one sealing cover (2).

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