Battery pack device and sealing ring structure thereof

Abstract

The invention provides a battery pack device and a sealing ring structure thereof. The sealing ring structure comprises a substrate supporting sheet; a sealing tongue piece is arranged on the base supporting piece; and a plurality of bolt via hole structures in one-to-one correspondence with the bolt connection positions of the battery pack box body are also arranged on the substrate supporting sheet. Air pressure and heat generated by thermal runaway of the battery pack can be timely and rapidly discharged, and the safety problem caused by plugging of a traditional pressure relief device can be avoided. And a bolt through hole structure is directly designed in the sealing ring supporting sheet. And the assembly efficiency is optimized, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pack device and a sealing ring structure thereof. Background Art

[0002] The safety issues of battery packs have become increasingly prominent, especially the frequent accidents related to thermal runaway of battery packs, which have attracted great public attention. Thermal runaway refers to the phenomenon that the temperature of battery cells rises rapidly under abnormal conditions (such as overcharging, overdischarging, short circuit or external collision), which in turn triggers a chain reaction. Such incidents not only cause serious damage to the vehicle itself, but may even threaten the lives of passengers.

[0003] In order to solve the above problems, in existing battery pack designs, pressure relief devices such as explosion-proof valves are usually installed on the box or upper cover. The main function of these devices is to discharge the large amount of gas generated into the external environment in a timely manner when thermal runaway of the battery cell occurs inside the battery pack, so as to prevent excessive accumulation of internal pressure or heat, thereby reducing further damage. Although this method has been widely used in battery pack design, it still has certain limitations in actual operation.

[0004] First, when rapid gas generation occurs inside the battery pack, traditional pressure relief devices such as explosion-proof valves may not be able to effectively discharge the gas in a timely manner. This is because the installation position of the pressure relief device on the battery pack is usually fixed, while the location of the battery cell that experiences thermal runaway in the battery pack is random. Such a design defect may lead to low pressure relief efficiency at critical times.

[0005] Secondly, during thermal runaway, the battery cells will release internal substances, which may clog the pressure relief device, thereby hindering the effective discharge of internal gases and heat, making the situation more critical.

[0006] Therefore, although certain measures have been taken in the prior art to prevent the hazards caused by thermal runaway of battery packs, there are still shortcomings in practical applications, and it is urgent to develop more effective solutions to improve the overall safety of battery packs. Summary of the invention

[0007] Based on the above content, the present invention provides a battery pack device and a sealing ring structure thereof, which only solves the technical problem that the safety of the battery pack in the prior art still needs to be improved.

[0008] A sealing ring structure of a battery pack device, the battery pack device comprising a battery box and an upper cover, the flange surface of the battery box and the flange surface of the upper cover having corresponding bolt connection holes, the sealing ring structure comprising:

[0009] A base support sheet is placed between the flange surface of the battery box and the flange surface of the upper cover;

[0010] A sealing tongue is provided on the base support sheet, and the sealing tongue faces the flange surface of the upper cover;

[0011] The base support sheet is also provided with a plurality of bolt through-hole structures corresponding to the positions of the bolt connection holes of the battery box;

[0012] The upper cover and the battery box are sealed and fixedly connected by bolts passing through the bolt connection holes on the upper cover flange surface, the bolt through-hole structure in the sealing ring structure and the bolt connection holes on the flange surface of the battery box body in sequence.

[0013] Furthermore, the sealing tongue piece includes a tongue root portion and a tongue tip portion which are integrally formed, and the tongue root portion is connected to the base support piece.

[0014] Furthermore, the tongue root is perpendicular to the plane of the base support sheet, and the tongue tip is inclined from the inner circle to the outer circle of the base support sheet. Furthermore, the base support sheet has at least two sealing tongues arranged from the inner circle to the outer circle.

[0015] Furthermore, a limiting ring is embedded in the bolt through-hole structure.

[0016] Furthermore, the limiting ring is a rigid structure.

[0017] Furthermore, the height dimension of the sealing ring structure is greater than the height dimension of the limiting ring.

[0018] Furthermore, the base support piece and the sealing tongue piece are integrally formed of rubber material.

[0019] A battery pack device, comprising:

[0020] A battery box body, a battery pack sealing ring structure as described above is placed on the flange surface of the battery box body, and the bolt through-hole structure in the battery pack sealing ring structure corresponds one-to-one with the bolt connection holes on the flange surface of the battery box body;

[0021] The bolt connection holes on the upper cover and the flange surface of the upper cover correspond to the bolt connection holes on the flange surface of the battery box body one by one;

[0022] The bolts pass through the bolt connection holes on the upper cover flange surface, the bolt through-hole structure in the battery pack sealing ring structure and the bolt connection holes on the flange surface of the battery box body in sequence, thereby achieving a fixed connection between the upper cover and the battery box body.

[0023] Furthermore, a pressure relief device is provided on the side shell of the battery box.

[0024] The beneficial technical effects of the present invention are:

[0025] Enhanced safety: Even if the pressure relief device fails for various reasons, the optimized sealing ring structure can still ensure that the gas pressure and heat generated by thermal runaway inside the battery pack can be quickly discharged. This greatly reduces the risk of secondary damage caused by poor pressure relief and improves the overall safety performance of the battery pack.

[0026] Improved reliability: By improving the design of the sealing ring, the battery pack can work more stably in the face of sudden thermal runaway events. Even if the traditional pressure relief device is blocked by substances released during thermal runaway, the present invention can ensure the smooth discharge of internal gas and heat, thereby avoiding the safety hazards caused by the blockage of the pressure relief device.

[0027] Improved response speed: The optimized seal ring can respond immediately at the early stage of thermal runaway of the battery pack, quickly reduce internal pressure and prevent heat accumulation. Compared with traditional designs, this innovative structure can activate the protection mechanism faster, effectively control the development of accidents and ensure personnel safety.

[0028] Simplified maintenance process: Since the new seal ring structure design reduces the dependence on specific pressure relief devices, it can simplify the relevant work processes during daily maintenance and inspection, reduce maintenance costs and difficulty, and also reduce the workload of technicians. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the assembly of a battery pack device of the present invention;

[0030] Figure 2 It is an assembly top view of a battery pack device of the present invention;

[0031] Figure 3 A BB transverse cross-sectional view of a bolt fastening position of a battery pack device in an installed state of the present invention;

[0032] Figure 4 It is an AA transverse cross-sectional view of a non-bolt fastening position of a battery pack device in an installed state of the present invention;

[0033] Figure 5 A schematic top view of a sealing ring structure of a battery pack device of the present invention;

[0034] Figure 6 A cross-sectional schematic diagram of a bolt through-hole structure position CC of a sealing ring structure of a battery pack device of the present invention;

[0035] Figure 7 A cross-sectional schematic diagram of a non-bolt through-hole structure position DD of a sealing ring structure of a battery pack device of the present invention;

[0036] in,

[0037] 1- Sealing ring structure;

[0038] 2-limiting ring;

[0039] 3-Battery box;

[0040] 4-Upper cover;

[0041] 5-pressure relief device;

[0042] 6-bolts;

[0043] 11- base support sheet;

[0044] 12- Sealing tongue;

[0045] 13- Bolt through hole structure;

[0046] 121- the tongue root of the sealing tongue;

[0047] 122-Tongue tip of the sealing tongue. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0051] See also Figure 1-7 The present invention provides a sealing ring structure of a battery pack device, the battery pack device comprising a battery box (3) and an upper cover (4), the flange surface of the battery box (3) and the flange surface of the upper cover (4) having corresponding bolt connection holes, and the sealing ring structure comprising:

[0052] A base support sheet (11) is placed between a flange surface of a battery box (3) and a flange surface of an upper cover (4) of the battery pack;

[0053] A sealing tongue (12) is provided on the base support sheet (11), and the sealing tongue (12) faces the flange surface of the upper cover (4);

[0054] The base support sheet (11) is also provided with a plurality of bolt through-hole structures corresponding one to one with the positions of the bolt connection holes of the battery box;

[0055] The bolts (6) are passed through the bolt connection holes on the flange surface of the upper cover (4), the bolt through-hole structure in the sealing ring structure (1), and the bolt connection holes on the flange surface of the battery box (3) in sequence, thereby achieving a sealed fixed connection between the upper cover (4) and the battery box (3).

[0056] The base support sheet (11) is an annular planar structure, that is, a circle of sealing body on the flange surface of the battery box connection.

[0057] Due to the setting of the sealing tongue (12), when thermal runaway occurs inside the battery pack, the internal air pressure and temperature rise sharply, and the battery pack pressure relief device is unable to discharge the above-mentioned substances in a timely and effective manner, and is deformed and opened under the action of the internal pressure of the battery pack. At this time, the air pressure and heat inside the battery pack are discharged to the outside of the battery pack along the position where the sealing tongue is opened, thereby achieving the purpose of reducing the safety risk of the battery pack.

[0058] The position and number of the bolt through-hole structure (13) in the sealing ring support sheet are consistent with the position and number of the sealing bolts on the flange surface connecting the battery box and the upper cover. By directly designing the bolt through-hole structure in the sealing ring support sheet, an additional positioning step can be omitted during the assembly process of the battery box and the upper cover, making the assembly process simpler and faster, improving production efficiency, and reducing the need for separate positioning parts or fixing parts, thereby reducing the number of parts. In addition, the fixation between the sealing ring and the connecting parts (battery box and upper cover) is made more secure, reducing the risk of leakage caused by displacement or loosening of the sealing ring. This design helps to improve the overall reliability of the sealing system. Directly setting through-holes on the sealing ring can better utilize the available space.

[0059] It can be seen that the battery pack sealing ring structure of the present invention enhances the safety, improves the reliability, increases the thermal runaway response speed, simplifies the maintenance process, and improves the assembly efficiency for the battery pack through the design of the sealing tongue and the bolt through-hole structure.

[0060] Furthermore, the sealing tongue piece (12) comprises a tongue root portion (121) and a tongue tip portion (122) formed in one piece, and the tongue root portion (121) is connected to the base support piece (11).

[0061] Specifically, the tongue root is integrally connected to the base support sheet, and the size gradually decreases from the base support sheet to the tongue tip. The tongue root serves as a strengthening diagonal brace rib to support the tongue tip, ensuring that the tongue tip of the sealing tongue can effectively contact the sealing surface.

[0062] Furthermore, the tongue root portion (121) is perpendicular to the plane of the base support sheet (11), and the tongue tip portion (122) is inclined from the inner circle of the base support sheet (11) to the outer circle.

[0063] The tongue tip is inclined from the inside to the outside of the circle of the base support sheet, that is, the direction of the tongue tip of the sealing tongue is offset from the inside to the outside of the battery pack. Furthermore, the angle between the tongue tip of the sealing tongue and the plane of the base support sheet is less than 90 degrees.

[0064] When thermal runaway occurs inside the battery pack, the internal air pressure and temperature rise sharply, and the battery pack pressure relief device is unable to discharge the above-mentioned substances in a timely and effective manner. Since the tip of the sealing tongue tilts from the inside to the outside of the circle, it is very easy to deform and open outward under the action of the internal pressure of the battery pack.

[0065] Furthermore, the base support sheet (11) has at least two sealing tongues (12) arranged from the inside to the outside of the circle.

[0066] Since there are a plurality of sealing tongues (12) on the entire base support sheet (11), the safety level of the battery pack is further improved.

[0067] Furthermore, the base support piece (11) and the sealing tongue piece (12) are integrally formed of a rubber material.

[0068] Specifically, the rubber material may be, for example but not limited to, silicone rubber, fluororubber, perfluororubber, etc.

[0069] Silicone rubber (VMQ) has excellent temperature resistance (from low temperature to high temperature), good electrical insulation properties, and good resistance to water and steam. It is one of the ideal choices for battery pack sealing rings.

[0070] Fluororocarbon (FKM) has excellent chemical resistance and heat resistance.

[0071] Perfluoroelastomer (FFKM) provides excellent chemical stability and wide temperature applicability.

[0072] Furthermore, a limiting ring (2) is embedded in the bolt through-hole structure (13).

[0073] The limiting ring is embedded in the sealing strip. During assembly, you only need to place the sealing ring including the limiting ring on the flange surface of the battery box and then tighten it with bolts to achieve the sealing effect.

[0074] Furthermore, the limiting ring (2) is a rigid structure.

[0075] Specifically, the material of the limiting ring is steel.

[0076] Furthermore, the height dimension of the battery pack sealing ring structure (1) is greater than the height dimension of the limiting ring.

[0077] The height dimension of the sealing ring structure is higher than that of the limiting ring, providing an interference fit between the box body and the upper cover. That is, when the bolts are tightened, the sealing ring structure is compressed due to its elastic structure until the upper cover is pressed to the same height as the sealing ring structure and the limiting ring. The sealing ring structure will no longer be compressed, and the sealing ring structure maintains a sealed shape under the action of the root of the sealing tongue, and the sealing assembly of the entire battery pack is completed.

[0078] The present invention also provides a battery pack device, comprising:

[0079] A battery box (3), a sealing ring structure (1) of the battery pack device as described above is placed on the flange surface of the battery box (2), and the bolt through-hole structure (13) in the battery pack sealing ring structure (1) corresponds one-to-one with the bolt connection holes on the flange surface of the battery box (3);

[0080] The upper cover (4), the bolt connection holes on the flange surface of the upper cover (4) and the bolt connection holes on the flange surface of the battery box (3) correspond one to one;

[0081] The bolts (6) are sequentially passed through the bolt connection holes on the flange surface of the upper cover (4), the bolt through-hole structure in the battery pack sealing ring structure (1), and the bolt connection holes on the flange surface of the battery box (3), thereby achieving a sealed and fixed connection between the upper cover (4) and the battery box (3).

[0082] Furthermore, a pressure relief device (5) is provided on the side shell of the battery box (3).

[0083] A battery pack sealing ring structure provided by the present invention can not only promptly and quickly discharge the gas pressure and heat generated by thermal runaway of the battery pack, but also avoid safety problems caused by blockage of traditional pressure relief devices.

[0084] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing ring structure of a battery pack device, the battery pack device comprising a battery box and an upper cover, the flange surface of the battery box and the flange surface of the upper cover having corresponding bolt connection holes, characterized in that: The sealing ring structure comprises: A base support sheet is placed between the flange surface of the battery box and the flange surface of the upper cover; A sealing tongue is provided on the base support sheet, and the sealing tongue faces the flange surface of the upper cover; The base support sheet is also provided with a plurality of bolt through-hole structures corresponding to the positions of the bolt connection holes of the battery box; The upper cover and the battery box are sealed and fixedly connected by bolts passing through the bolt connection holes on the upper cover flange surface, the bolt through-hole structure in the sealing ring structure and the bolt connection holes on the flange surface of the battery box body in sequence.

2. The sealing ring structure of a battery pack device according to claim 1, characterized in that: The sealing tongue piece includes a tongue root portion and a tongue tip portion which are integrally formed, and the tongue root portion is connected to the base support piece.

3. The sealing ring structure of a battery pack device according to claim 2, characterized in that: The tongue root portion is perpendicular to the plane of the base support sheet, and the tongue tip portion is inclined from the inner circle of the base support sheet to the outer circle.

4. The sealing ring structure of a battery pack device according to claim 1, characterized in that: The base support sheet has at least two sealing tongues arranged from the inner circle to the outer circle.

5. The sealing ring structure of a battery pack device according to claim 1, characterized in that: A limiting ring is embedded in the bolt through-hole structure.

6. The sealing ring structure of a battery pack device according to claim 5, characterized in that: The limiting ring is a rigid structure.

7. The sealing ring structure of a battery pack device according to claim 5, characterized in that: The height dimension of the sealing ring structure is greater than the height dimension of the limiting ring.

8. The sealing ring structure of a battery pack device according to claim 5, characterized in that: The base support piece and the sealing tongue piece are integrally formed of a rubber material.

9. A battery pack device, characterized in that: include: A battery box, wherein a sealing ring structure of a battery pack device according to any one of claims 1 to 8 is placed on the flange surface of the battery box, and the bolt through-hole structures in the sealing ring structure correspond one-to-one to the bolt connection holes on the flange surface of the battery box; An upper cover, wherein the bolt connection holes on the flange surface of the upper cover correspond to the bolt connection holes on the flange surface of the battery box body in a one-to-one manner; The bolts sequentially pass through the bolt connection holes on the upper cover flange surface, the bolt through-hole structure in the sealing ring structure and the bolt connection holes on the battery box flange surface, thereby achieving a sealed and fixed connection between the upper cover and the battery box.

10. A battery pack device as claimed in claim 9, characterized in that: A pressure relief device is provided on the side shell of the battery box.

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