Battery pack apparatus and sealing ring structure thereof

Abstract

The present invention provides a battery pack apparatus and a sealing ring structure thereof. The sealing ring structure comprises a base support member. The base support member is provided with a sealing tongue. The base support member is further provided with a plurality of bolt through-hole structures in one-to-one correspondence with bolt connection positions on a battery pack housing. Gas pressure and heat generated by thermal runaway of the battery pack can be promptly discharged, and safety problems caused by blockage of conventional pressure relief apparatuses can be avoided. The sealing ring support member is designed such that the bolt through-hole structures are directly incorporated therein, thereby optimizing assembly efficiency and reducing costs.

Description

Battery pack device and sealing ring structure thereof TECHNICAL FIELD

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

[0002] Safety issues related to battery packs have become increasingly prominent, especially the frequent accidents related to thermal runaway of battery packs, which have attracted widespread public attention. Thermal runaway refers to a phenomenon where battery cells rapidly increase in temperature under abnormal conditions (such as overcharging, over-discharging, short circuit, or external impact, etc.), which in turn triggers a chain reaction. Such incidents not only cause serious damage to the vehicle itself, but also may threaten the safety of passengers.

[0003] To solve the above problems, existing battery pack designs usually install explosion-proof valves and other pressure relief devices at the box or upper cover parts. The main function of these devices is to timely discharge the large amount of gas generated inside the battery pack to the external environment when thermal runaway of the battery cells occurs, 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, there are still certain limitations in actual operation.

[0004] Firstly, when rapid gas generation occurs inside the battery pack, the traditional explosion-proof valve and other pressure relief devices may not be able to effectively discharge the gas in time. This is because the installation position of the pressure relief device on the battery pack is usually fixed, while the position of the battery cell that undergoes thermal runaway is random. Such design defects may result in low pressure relief efficiency at critical times.

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

[0006] Therefore, although certain measures have been taken in the prior art to prevent the hazards caused by thermal runaway of the battery pack, there are still deficiencies in actual application, and it is urgent to develop more effective solutions to improve the overall safety of the battery pack. SUMMARY

[0007] Based on the above, the present application provides a battery pack device and a sealing ring structure thereof, which 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 one-to-one bolt connection holes, the sealing ring structure comprising:

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

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

[0011] A plurality of bolt through-hole structures corresponding to the positions of the bolt connecting holes of the battery box are arranged on the base support sheet.

[0012] The bolts are sequentially threaded through the bolt connecting holes on the flange surface of the upper cover, the bolt through-hole structures in the sealing ring structure, and the bolt connecting holes on the flange surface of the battery box, thereby achieving the sealed and fixed connection of the upper cover and the battery box.

[0013] Further, the sealing tongue includes an integrally formed tongue root and a tongue tip, and the tongue root is connected to the base support sheet.

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

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

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

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

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

[0019] A battery pack device includes:

[0020] A battery box, and a battery pack sealing ring structure as described above is arranged on the flange surface of the battery box, and the bolt through-hole structures in the battery pack sealing ring structure correspond to the bolt connecting holes on the flange surface of the battery box.

[0021] An upper cover, and the bolt connecting holes on the flange surface of the upper cover correspond to the bolt connecting holes on the flange surface of the battery box.

[0022] Bolts are sequentially threaded through the bolt connecting holes on the flange surface of the upper cover, the bolt through-hole structures in the battery pack sealing ring structure, and the bolt connecting holes on the flange surface of the battery box, thereby achieving the fixed connection of the upper cover and the battery box.

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

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

[0025] Enhanced safety: Even if the pressure relief device fails for various reasons, the optimized sealing ring structure can still ensure that the internal pressure and heat generated by thermal runaway in the battery pack are quickly discharged. This greatly reduces the risk of secondary damage due to poor pressure relief, improving 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 invention can ensure the smooth discharge of internal gas and heat, avoiding safety hazards caused by the blocking of the pressure relief device.

[0027] Improved response speed: The optimized sealing ring can respond immediately at the initial stage of battery pack thermal runaway, quickly reducing internal pressure and preventing heat accumulation. Compared to 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 sealing ring structure design reduces the dependence on specific pressure relief devices, the relevant work processes can be simplified during routine maintenance and inspection, reducing maintenance costs and difficulty, and also reducing the workload of technical personnel. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is an assembly diagram of a battery pack device of the present application;

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

[0031] Figure 3 is a B-B transverse sectional view of the bolt fastening position of the battery pack device of the present application in the installed state;

[0032] Figure 4 is an A-A transverse sectional view of the non-bolt fastening position of the battery pack device of the present application in the installed state;

[0033] Figure 5 is a top view schematic diagram of the sealing ring structure of the battery pack device of the present application;

[0034] Figure 6 is a sectional view schematic diagram of the bolt via structure position C-C of the sealing ring structure of the battery pack device of the present application;

[0035] Figure 7 is a sectional view schematic diagram of the non-bolt via structure position D-D of the sealing ring structure of the battery pack device of the present application;

[0036] Wherein, 1-sealing ring structure; 2-limiting ring; 3-battery box; 4-upper cover; 5-pressure relief device; 6-bolt; 11-base support sheet; 12-sealing tongue; 13-bolt via hole structure; 121-tongue root of sealing tongue; 122-tongue tip of sealing tongue. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0039] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited to the present application.

[0040] Referring to FIGS. 1-7, the present application 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 one-to-one bolt connection holes, and the sealing ring structure comprising:

[0041] a base support sheet (11) placed between the flange surface of the battery box (3) and the flange surface of the upper cover (4);

[0042] a sealing tongue (12) provided on the base support sheet (11), the sealing tongue (12) facing the flange surface of the upper cover (4);

[0043] a plurality of bolt via hole structures corresponding one-to-one to the positions of the bolt connection holes of the battery box are further provided on the base support sheet (11);

[0044] the upper cover (4) and the battery box (3) are sealingly and fixedly connected by sequentially passing the bolt (6) through the bolt connection hole on the flange surface of the upper cover (4), the bolt via hole structure in the sealing ring structure (1), and the bolt connection hole on the flange surface of the battery box (3).

[0045] the base support sheet (11) is a ring-shaped planar structure, i.e., a ring of sealing bodies on the connecting flange surface of the battery box.

[0046] When the battery pack is in thermal runaway, the internal pressure and temperature of the battery pack rise rapidly, and the battery pack pressure relief device cannot effectively discharge the above-mentioned substances in time. Under the action of the internal pressure of the battery pack, the sealing tongue 12 deforms and opens. This deformation process reduces the volume of the sealing tongue 12, and further forms a gap between the battery box and the upper cover which were originally in a sealed state. At this time, the internal pressure and heat of the battery pack will quickly discharge to the outside of the battery pack along the gap formed by the opening of the sealing tongue, thereby achieving the purpose of reducing the safety risk of the battery pack. 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 of the battery box and the upper cover. The bolt through-hole structure is directly designed in the sealing ring support sheet, which can save the additional positioning step during the assembly of the battery box and the upper cover, making the assembly process more simple and efficient, improving the production efficiency, and reducing the need for separate positioning or fixing parts, thereby reducing the number of parts. Moreover, the fixation between the sealing ring and the connecting parts (battery box and upper cover) is more firm, 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. The through-hole directly provided on the sealing ring can better utilize the available space.

[0047] As can be seen, the battery pack sealing ring structure of the present application enhances the safety, improves the reliability, improves the thermal runaway response speed, simplifies the maintenance process, and improves the assembly efficiency of the battery pack through the design of the sealing tongue and the bolt through-hole structure.

[0048] Further, the sealing tongue (12) includes an integrally formed tongue root portion (121) and a tongue tip portion (122), and the tongue root portion (121) is connected to the base support sheet (11).

[0049] Specifically, the tongue root portion and the base support sheet are integrally connected, and the size gradually decreases from the base support sheet to the tongue tip portion. The tongue root portion acts as a reinforcing diagonal strut, which acts as a diagonal strut for the tongue tip portion, ensuring that the tongue tip portion of the sealing tongue can effectively contact the sealing surface.

[0050] Further, the tongue root part (121) is perpendicular to the plane of the base support sheet (11), and the tongue tip part (122) is inclined from the inner ring to the outer ring of the base support sheet (11). Specifically, the tongue tip part (122) forms a “V” shape together with the base support sheet (11), and the opening of the “V” shape faces the outside of the box. This shape is similar to an unfolded wing, so that the sealing tongue (12) has the function of a one-way valve. That is, only the high-pressure gas inside the battery pack can be discharged outward, and external substances cannot enter the inside of the battery pack through this structure, thereby ensuring the pressure relief effect while avoiding additional effects of the external environment on the inside of the battery pack. The tongue tip part is inclined from the inner ring to the outer ring of the base support sheet, that is, the direction of the tongue tip part of the sealing tongue is biased from the inside to the outside of the battery pack, and further, the included angle between the tongue tip part of the sealing tongue and the plane of the base support sheet is less than 90 degrees.

[0051] When thermal runaway occurs inside the battery pack, the internal gas pressure and temperature rise sharply, and the battery pack pressure relief device cannot effectively discharge the above-mentioned substances in time. Due to the inclination of the tongue tip part of the sealing tongue from the inner ring to the outer ring, the tongue tip part is easily deformed and opened outward under the action of the pressure inside the battery pack.

[0052] Further, the base support sheet (11) has at least two sealing tongues (12) arranged from the inner ring to the outer ring.

[0053] Since there are multiple sealing tongues (12) on the entire base support sheet (11), the safety level of the battery pack is further improved.

[0054] Further, the base support sheet (11) and the sealing tongue (12) are integrally formed of a rubber material.

[0055] Specifically, the rubber material may be, but is not limited to, silicone rubber, fluorine rubber, perfluorinated rubber, etc.

[0056] Silicone rubber (Silicone, VMQ) has excellent temperature resistance (from low temperature to high temperature), good electrical insulation performance, and good resistance to water and steam, and is one of the ideal choices for battery pack sealing rings.

[0057] Fluorine rubber (Fluorocarbon, FKM) has excellent chemical resistance and heat resistance.

[0058] Perfluorinated rubber (Perfluoroelastomer, FFKM) provides excellent chemical stability and wide temperature applicability.

[0059] Further, the limiting ring (2) is embedded in the bolt via hole structure (13).

[0060] The limiting ring is embedded in the sealing strip, and when assembling, only the sealing ring containing the limiting ring is placed on the flange surface of the battery box body, and then fastened through bolts, so that the sealing effect is achieved.

[0061] Further, the limiting ring (2) is a rigid structure.

[0062] Specifically, the material of the limiting ring is rigid.

[0063] Further, the height dimension of the battery pack sealing ring structure (1) is greater than the height dimension of the limiting ring.

[0064] The height dimension of the sealing ring structure is higher than that of the limiting ring, and an interference fit is provided between the box body and the upper cover, that is, when the bolts are locked, the sealing ring structure is compressed due to the elastic structure of the sealing ring, until the upper cover is pressed to the same height of the sealing ring structure and the limiting ring, the sealing ring structure will not be compressed any more, and the sealing ring structure maintains the sealing shape under the action of the tongue root of the sealing tongue piece, and the whole battery pack sealing assembly is completed.

[0065] The application also provides a battery pack device, comprising:

[0066] A battery box body (3), the flange surface of the battery box body (2) is provided with the sealing ring structure (1) of the aforementioned battery pack device, and the bolt through hole structure (13) in the battery pack sealing ring structure (1) corresponds to the bolt connection hole on the flange surface of the battery box body (3) one by one;

[0067] An upper cover (4), the bolt connection holes on the flange surface of the upper cover (4) correspond to the bolt connection holes on the flange surface of the battery box body (3) one by one;

[0068] Bolts (6) pass 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 body (3) in sequence, so that the sealing and fixed connection of the upper cover (4) and the battery box body (3) is realized.

[0069] Further, the side shell of the battery box body (3) is provided with a pressure relief device (5).

[0070] The battery pack sealing ring structure provided by the application can not only timely and rapidly discharge the gas pressure and heat generated by thermal runaway of the battery pack, but also can avoid the safety problems caused by plugging of the traditional pressure relief device.

[0071] The above is only the preferred embodiment of the application, and does not limit the implementation and protection scope of the application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the specification and drawings should be included in the protection scope of the application.

Claims

1. A seal ring structure of a battery pack device, the battery pack device including a battery case and an upper cover, a flange surface of the battery case and a flange surface of the upper cover having one-to-one corresponding bolt connection holes, characterized in that, The sealing ring structure comprises: a base support sheet placed between the flange surface of the battery box and the flange surface of the upper cover; a sealing tongue piece provided on the base support sheet, the sealing tongue piece facing the flange surface of the upper cover; a plurality of bolt through-hole structures corresponding to the positions of the bolt connection holes of the battery box are further provided on the base support sheet; the upper cover and the battery box are sealingly and fixedly connected by sequentially passing bolts through the bolt connection holes on the flange surface of the upper cover, the bolt through-hole structures in the sealing ring structure, and the bolt connection holes on the flange surface of the battery box.

2. The sealing ring structure of a battery pack apparatus according to claim 1, wherein The sealing tongue piece comprises an integrally formed tongue root part and a tongue tip part, and the tongue root part is connected to the base support sheet.

3. The seal ring structure of a battery pack apparatus according to claim 2, wherein The tongue root part is perpendicular to the plane of the base support sheet, and the tongue tip part is inclined from the inside of the ring to the outside of the ring.

4. The sealing ring structure of a battery pack apparatus according to claim 1, wherein The base support sheet is arranged with at least two sealing tongue pieces from the inside of the ring to the outside of the ring.

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

6. The sealing ring structure of a battery pack apparatus according to claim 5, wherein The limiting ring is a rigid structure.

7. The sealing ring structure of a battery pack apparatus according to claim 5, wherein 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 apparatus according to claim 5, wherein The base support sheet and the sealing tongue piece are integrally formed of rubber material.

9. A battery pack apparatus, characterized by, The battery box comprises: a base support sheet placed between the flange surface of the battery box and the flange surface of the upper cover; a sealing tongue piece provided on the base support sheet, the sealing tongue piece facing the flange surface of the upper cover; a plurality of bolt through-hole structures corresponding to the positions of the bolt connection holes of the battery box are further provided on the base support sheet; 10. The battery pack apparatus of claim 9, wherein, the upper cover and the battery box are sealingly and fixedly connected by sequentially passing bolts through the bolt connection holes on the flange surface of the upper cover, the bolt through-hole structures in the sealing ring structure, and the bolt connection holes on the flange surface of the battery box. The side shell of the battery box is provided with a pressure relief device.

Images