Pressure relief type battery shell structure

Abstract

The utility model relates to a pressure relief type battery shell structure. The pressure relief type battery shell structure comprises a shell body, a sheet body and a puncturing component, an air hole group is formed in the shell body; the sheet body covers the inner wall surface of the shell body corresponding to the position of the air hole group; the puncturing component is arranged on the inner wall face and faces the sheet body. When gas is generated in the shell body, air pressure is generated in the shell body and forces the sheet body to deform towards the puncturing component until the sheet body is punctured by the puncturing component, so that the gas is discharged to the outside through the punctured position and the gas hole group. Therefore, gas generated in the shell body can be effectively exhausted, and the situation that the sealed shell body expands and even explodes due to the fact that the air pressure is too large is avoided.

Description

Technical Field

[0001] The present application relates to lithium batteries, and in particular to a pressure relief type battery casing structure. Background Art

[0002] The linear actuators used in current medical devices are all driven by electricity, so that the linear actuators are used to drive the medical devices to adjust the height or the tilt angle.

[0003] Although it is convenient to use electricity to drive, the medical device has the problem of limited mobility due to the need to connect to the mains. Therefore, a lithium battery backup battery box is installed on the medical device so that the medical device can still provide the required power when it is moving.

[0004] Although the backup battery box can provide power, the life of the lithium battery cell in the box will decline over time. Once the lithium battery cell is damaged or due to other factors, the lithium battery cell will quickly generate a large amount of gas in the sealed casing, causing the air pressure inside the casing to increase. If the gas that causes the increased air pressure is not discharged, the sealed backup battery box will expand or even explode, causing danger.

[0005] Although pressure relief valves are currently used to exhaust gas, they not only take up space but are also relatively expensive, and there is indeed a need for improvement.

[0006] Therefore, how to improve the above-mentioned deficiencies of the prior art is a major issue that the inventors of this application are eager to solve. Utility Model Content

[0007] The purpose of the present application is to provide a pressure relief battery housing structure that can discharge a large amount of gas generated by the damage of a lithium battery core assembly to the outside to avoid expansion or even explosion due to excessive internal gas pressure.

[0008] In order to achieve the above-mentioned purpose, the present application provides a pressure relief type battery shell structure, including: a shell body, having a accommodating space and having a pore group connected to the accommodating space; a sheet body, which is arranged in the accommodating space corresponding to the position of the pore group; and a puncturing member, which is arranged in the shell body corresponding to the sheet body in the accommodating space; wherein, when gas is generated in the accommodating space, the sheet body is squeezed by the gas and deformed toward the puncturing member until it is punctured by the puncturing member, so that the gas in the accommodating space is discharged to the outside through the pore group.

[0009] In one embodiment, the shell body has an inner wall surface and an outer wall surface facing each other, the pore group penetrates the inner wall surface and the outer wall surface, and the piercing member is arranged on the inner wall surface and has a piercing portion, which faces the sheet body.

[0010] In one embodiment, the thorn portion is spaced apart from the sheet body.

[0011] In one embodiment, the shell body has an inner wall surface and an outer wall surface opposite to each other, the pore group penetrates the inner wall surface and the outer wall surface, the inner wall surface forms an active chamber, the accommodating space is connected to the pore group via the active chamber, the puncturing component is arranged in the active chamber, and the sheet body covers the active chamber.

[0012] In one embodiment, the piercing member is disposed on the inner wall surface in the activity chamber, and the pore group is opened on the shell body corresponding to the position of the activity chamber.

[0013] In one embodiment, the activity chamber is a groove that is sunken from the inner wall surface toward the outer wall surface, and the sheet body covers the inner wall surface at a position corresponding to the activity chamber.

[0014] In one embodiment, the inner wall surface corresponds to the position of the activity chamber and further has a convex wall protruding from the outer wall surface toward the inner wall surface, the groove and the convex wall together form the activity chamber, and the sheet body is arranged on the convex wall.

[0015] In one embodiment, the sheet body is a waterproof breathable sheet.

[0016] In one embodiment, the pore group comprises a plurality of pores, and the plurality of pores are distributed around the piercing member.

[0017] In one embodiment, the housing body includes a first shell and a second shell combined with each other.

[0018] Compared with the prior art, the present application has the following effects: it can effectively discharge a large amount of gas generated by the lithium battery core assembly to avoid the expansion or even explosion of the sealed shell body due to excessive gas pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional schematic diagram of the battery housing structure of the present application when a lithium battery core component is accommodated.

[0020] Figure 2 This application is based on Figure 1 Schematic cross-sectional view of .

[0021] Figure 3 This application is based on Figure 2 A partial enlarged view of .

[0022] Figure 4 It is a three-dimensional exploded schematic diagram of the sheet body and the second shell in the present application before being assembled.

[0023] Figure 5 This application is based on Figure 4 A partial enlarged view of .

[0024] Figure 6 It is a three-dimensional schematic diagram of the sheet body and the second shell after being combined in this application.

[0025] Figure 7 It is a cross-sectional schematic diagram of the sheet body in the present application when being punctured by the puncturing member.

[0026] Description of reference numerals:

[0027] 100: battery housing structure;

[0028] 1: Shell body;

[0029] 1a: first shell;

[0030] 1b: second shell;

[0031] 11: Inner wall surface;

[0032] 111: convex wall;

[0033] 12: Outer wall surface;

[0034] 13: Stomatal group;

[0035] 131: pore;

[0036] 14: Accommodation space;

[0037] 15: Activity room;

[0038] 2: sheet body;

[0039] 21: peripheral part;

[0040] 3: puncture component;

[0041] 31: thorn part;

[0042] 500: lithium battery cell assembly;

[0043] 5: Lithium battery cell;

[0044] D: interval distance. DETAILED DESCRIPTION

[0045] The detailed description and technical contents of the present application are described as follows in conjunction with the accompanying drawings. However, the attached drawings are only provided for reference and illustration and are not intended to limit the present application.

[0046] The present application provides a pressure relief type battery housing structure, such as Figure 1 and Figure 2 As shown, it includes a pressure relief type battery casing structure (referred to as battery casing structure) 100 and a lithium battery core assembly 500, and the lithium battery core assembly 500 is accommodated in the battery casing structure 100. Among them, the lithium battery core assembly 500 includes at least one lithium battery core 5, and as shown in the figure, includes a plurality of lithium battery cores 5 stacked on each other; the battery casing structure 100 includes: a casing body 1, a sheet body 2 and a piercing member 3.

[0047] like Figure 1 and Figure 2 As shown, the housing body 1 has a containing space 14, and the aforementioned lithium battery core assembly 500 is contained in the containing space 14. The housing body 1 is also provided with a pore group 13, and the pore group 13 is connected to the containing space 14. The housing body 1 has an inner wall surface 11 and an outer wall surface 12 opposite to each other, and the containing space 14 is located within the inner wall surface 11; the pore group 13 includes at least one pore 131, such as Figure 5 As shown, it includes a plurality of air holes 131 surrounding each other, and each air hole 131 penetrates the inner wall surface 11 and the outer wall surface 12 .

[0048] It should be noted that the housing body 1 can be a single-piece structure (not shown) or a Figure 1 , Figure 2 and Figure 4 The two-piece structure shown includes a first shell 1 a and a second shell 1 b , which can be combined with each other to form a housing body 1 .

[0049] like Figures 2 to 6 As shown, the sheet 2 is a deformable sheet that can be deformed due to external force, for example, it can be a waterproof breathable sheet or a waterproof breathable membrane. The present application does not limit this, as long as it can be deformed under the action of external force; and the so-called waterproof breathable, as the name implies, means: having both waterproof and breathable effects, wherein the waterproof effect can prevent external moisture from entering the shell body 1, and as for the breathable effect, it can discharge the slight gas that will be generated by the gradual consumption of the lithium battery core assembly 500 during normal use. The sheet 2 is arranged on the inner wall surface 11 corresponding to the position of the pore group 13 in the accommodating space 14, so that the sheet 2 is blocked between the accommodating space 14 and the pore group 13. In other words, if the lithium battery core assembly 500 only generates slight gas due to the aforementioned gradual normal consumption, these slight gases will only be discharged to the outside by the breathable effect of the sheet 2; but if the lithium battery core assembly 500 quickly generates a large amount of gas due to damage, it will be squeezed by the gas and force the sheet 2 to deform.

[0050] like Figures 2 to 6 As shown, the piercing member 3 can be any member having a piercing portion 31, for example, a conical member as shown in the figure, but the present application is not limited thereto. The piercing member 3 is also arranged on the inner wall surface 11 in the accommodating space 14 at a position corresponding to the position of the air hole group 13, and the piercing portion 31 faces the sheet body 2, and the piercing portion 31 is as shown in the figure. Figure 3As shown, a small distance D is maintained between the sheet 2 and the sheet 2 to provide space for the sheet 2 to deform. It should be noted that the reason for maintaining this small distance D is to allow the sheet 2 to deform sufficiently to be pierced by the thorn portion 31 only when the lithium battery core assembly 500 rapidly generates a large amount of gas as described above; when the lithium battery core assembly 500 only generates a small amount of gas due to normal consumption as described above, even if the sheet 2 is slightly deformed, it will not touch the thorn portion 31. It should be noted that the thorn portion 31 can be a pointed body as shown in the figure, or any shape or structure that can pierce the sheet 2, and the present application does not limit this, as long as it can pierce the sheet 2.

[0051] like Figure 3 As shown, in order to keep a small distance D between the thorn portion 31 and the sheet 2, an activity chamber 15 can be formed on the inner wall surface 11, and the sheet 2 is arranged on the inner wall surface 11 in a covering manner corresponding to the position of the activity chamber 15, so that the sheet 2 covers the activity chamber 15. Specifically, the activity chamber 15 can be a groove, which is at least formed by being recessed from the inner wall surface 11 toward the outer wall surface 12 (so that the bottom of the groove will move away from the original inner wall surface 11 in one direction). In other embodiments, the groove can be further formed by a convex wall 111 protruding from the inner wall surface 11 (so that the head of the convex wall 111 will move away from the original inner wall surface 11 in the opposite direction), so that the height of the activity chamber between the head of the convex wall 111 and the bottom of the groove is increased; at this time, the aforementioned accommodating space 14 is connected to the air hole group 13 through the activity chamber 15. The sheet 2 has a peripheral portion 21, and the sheet 2 is disposed on the wall head of the convex wall 111 with its peripheral portion 21, and the piercing member 3 is disposed on the recessed portion of the inner wall surface 11 (i.e., the bottom of the groove) in the activity chamber 15, and the height of the piercing member 3 itself must be smaller than the height of the activity chamber by the aforementioned spacing distance D, so that a small spacing distance D can be maintained between the piercing portion 31 and the sheet 2. As for the plurality of air holes 131, they are opened in the housing body 1 corresponding to the location of the activity chamber 15; in addition, these air holes 131 can be distributed around the piercing member 3, but are not limited thereto.

[0052] It should be noted that if Figure 4 and Figure 5 As shown, the activity chamber 15 is formed in the second housing 1 b , but the present invention is not limited thereto.

[0053] By this, Figure 3 As shown, when the sheet 2 is intact and undamaged, the battery housing structure 100 is a closed space, and only the slight gas generated by the lithium battery core assembly 500 as described above will be discharged to the outside by utilizing the ventilation effect of the sheet 2. Figure 7As shown, when the lithium battery cell assembly 500 accommodated in the battery shell structure 100 is damaged, the lithium battery cell assembly 500 will quickly generate a large amount of gas in the closed space, and the gas will generate air pressure in the shell body 1, and use the air pressure to force the sheet 2 to deform, and make the deformed part move toward the thorn portion 31, so that the sheet 2 is pierced by the thorn portion 31 of the piercing member 3. In this way, a large amount of gas generated by the damage of the lithium battery cell assembly 500 can enter the active chamber 15 through the punctured part of the sheet 2, and then be discharged to the outside through the pore group 13. Therefore, it can have a pressure relief effect when the lithium battery cell assembly 500 quickly generates a large amount of gas due to damage. In other words, it can also prevent the shell body 1 from expanding or even exploding when the lithium battery cell assembly 500 generates a large amount of gas.

[0054] In simple terms, the present application utilizes the large amount of gas generated when the lithium battery core assembly 500 is damaged to increase the air pressure inside the outer shell body 1, and then utilizes the increase in air pressure to force the sheet body 2 to deform toward the piercing member 3. In this way, the deformed sheet body 2 can be pierced by the piercing member 3, and then the aforementioned large amount of gas is discharged from the pore group 13 to release the pressure. This is effective, simple in structure, does not take up space, and has low cost.

[0055] In summary, the pressure relief battery casing structure of the present application can indeed achieve the expected purpose and effect of use, and can solve the deficiencies of the prior art, and therefore a patent application is filed.

[0056] The above is only the preferred feasible embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the description and drawings of the present application are also included in the scope of the rights of the present application and are hereby stated.

Claims

1. A pressure relief battery housing structure, characterized in that: include: The outer shell body has a containing space and is provided with a group of air holes communicating with the containing space; A sheet body, arranged in the accommodation space corresponding to the position of the air hole group; as well as a piercing member, arranged on the housing body in the accommodating space corresponding to the sheet body; When gas is generated in the accommodating space, the sheet is squeezed by the gas and deformed toward the piercing member until it is pierced by the piercing member, so that the gas in the accommodating space is discharged to the outside through the pore group.

2. The pressure relief type battery housing structure according to claim 1, characterized in that: The shell body has an inner wall surface and an outer wall surface facing each other, the pore group penetrates the inner wall surface and the outer wall surface, the piercing member is arranged on the inner wall surface and has a piercing portion, and the piercing portion faces the sheet body.

3. The pressure relief battery housing structure according to claim 2, characterized in that: The thorn portion is spaced apart from the sheet body.

4. The pressure relief type battery housing structure according to claim 1, characterized in that: The shell body has an inner wall surface and an outer wall surface opposite to each other, the pore group penetrates the inner wall surface and the outer wall surface, the inner wall surface forms an active chamber, the accommodating space is connected to the pore group via the active chamber, the piercing member is arranged in the active chamber, and the sheet body covers the active chamber.

5. The pressure relief type battery housing structure according to claim 4, characterized in that: The piercing member is arranged on the inner wall surface in the activity chamber, and the air hole group is opened on the shell body corresponding to the position of the activity chamber.

6. The pressure relief type battery housing structure according to claim 4, characterized in that: The activity chamber is a groove that is sunken from the inner wall surface toward the outer wall surface, and the sheet body covers the inner wall surface at a position corresponding to the activity chamber.

7. The pressure relief type battery housing structure according to claim 6, characterized in that: The inner wall surface further has a convex wall protruding from the outer wall surface toward the inner wall surface corresponding to the position of the activity chamber, the groove and the convex wall together form the activity chamber, and the sheet body is arranged on the convex wall.

8. The pressure relief type battery housing structure according to claim 1, characterized in that: The sheet body is a waterproof and breathable sheet.

9. The pressure relief type battery housing structure according to claim 1, characterized in that: The pore group includes a plurality of pores, and the plurality of pores are distributed around the puncturing member.

10. The pressure relief type battery housing structure according to claim 1, characterized in that: The housing body includes a first shell and a second shell combined with each other.

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