Battery structure

Abstract

The utility model relates to a battery structure, belongs to the technical field of batteries, and solves at least one of the problems that a sealing ring is not stably supported, insufficient sealing is easily caused and a rolling groove is easily broken in the conventional battery structure. The device comprises a shell, a cover cap, a sealing ring and a supporting gasket, the shell is provided with a pressing part, an annular wall and a rolling groove, the pressing part, the annular wall and the rolling groove jointly define a mounting cavity, and the cover cap covers and seals the mounting cavity; the sealing ring is filled in the mounting cavity; the pressing part is bent inwards and used for pressing the sealing ring on the outer end face of the cap. The rolling grooves protrude inwards; the supporting gasket comprises a jacking part and a supporting part, the supporting part is embedded in the rolling groove, and the jacking part abuts against the sealing ring to support the sealing ring and press the sealing ring on the inner end face of the cap. According to the utility model, the sealing ring can be pressed on the inner end face of the cap through the supporting gasket, so that the section of sealing ring is prevented from collapsing, the sealing performance of the sealing ring is improved, and the battery is fully sealed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery structure. Background Art

[0002] Since Tesla released the 46 series large cylindrical battery, the large cylindrical series battery has gradually become a hot spot in the industry, and major companies have made plans. The 46 series refers to batteries with a battery diameter of 46 and varying heights, which achieve a larger volume in structure. The main advantage of the 46 large cylindrical series battery is that the single cell capacity is nearly 5 to 8 times higher than the 26 series. The outer shell does not increase significantly with the increase in the outer diameter of the battery, the proportion of internal chemical active substances increases, and the energy density increases: the endurance is increased by 16%; the existing 46 series large cylindrical battery structure has a larger sealing diameter than the traditional 18650 and 26700. The increase in diameter puts higher requirements on the sealing performance of the battery after sealing (industry standard: internal pressure ≥ 2.0Mpa without leakage).

[0003] In the existing battery structure, a sealing ring is provided to seal the gap between the cap and the shell, and the cap and the sealing ring are usually supported by rolling grooves. On the one hand, the rolling grooves of the existing battery structure have a small contact area with the sealing ring, and the sealing ring is easy to sag, which provides unstable support for the sealing ring, resulting in insufficient sealing and easy leakage of electrolyte; on the other hand, the compressed sealing ring cannot be supported, which easily leads to the breakage of the rolling grooves. Utility Model Content

[0004] In view of the above analysis, the utility model aims to provide a battery structure to solve at least one of the problems of unstable support for the sealing ring in the existing battery structure, which easily causes insufficient sealing and easily leads to rolling groove breakage.

[0005] The purpose of this utility model is mainly achieved through the following technical solutions:

[0006] A battery structure includes a shell, a cap, a sealing ring and a supporting gasket, one end of the shell is an open end, the open end is provided with a clamping portion, an annular wall and a rolling groove, the clamping portion, the annular wall and the rolling groove together form an installation cavity, and the cap is sealed in the installation cavity; the sealing ring is filled in the installation cavity to seal the gap between the cap and the shell; the clamping portion is bent inwardly to press the sealing ring against the outer end face of the cap; the rolling groove protrudes inwardly, and the supporting gasket includes a pressing portion and a supporting portion, the supporting portion is embedded in the rolling groove, the pressing portion abuts against the sealing ring to support the sealing ring and press the sealing ring against the inner end face of the cap.

[0007] Furthermore, the sealing ring includes a first sealing segment, a second sealing segment and a third sealing segment, the first sealing segment is opposite to the pressing portion, the second sealing segment is opposite to the annular wall, and the third sealing segment is opposite to the supporting gasket.

[0008] Furthermore, the pressing portion compresses the first sealing section so that the first sealing section is pressed against the outer end surface of the cap to form a primary seal.

[0009] Furthermore, the tightening portion abuts against the third sealing segment and compresses the third sealing segment so that the third sealing segment is pressed against the inner end surface of the cap to form a secondary seal.

[0010] Furthermore, the cross-sectional shape of the support portion is arc-shaped, and can fit with the outer circumferential surface of the rolling groove.

[0011] Furthermore, the first sealing section is compressed and deformed after being pressed onto the outer end surface of the cap, and the thickness of the first sealing section after the compression deformation is 50±10% of that before the compression.

[0012] Furthermore, the third sealing segment is compressed and deformed after being pressed onto the inner end surface of the cap, and the thickness of the third sealing segment after the compression deformation is 50±10% of that before the compression.

[0013] Furthermore, the second sealing section is filled between the edge of the cap and the annular wall to form a triple seal.

[0014] Furthermore, there is a bending angle between the pressing portion and the annular wall, and the bending angle is 90±20°.

[0015] Furthermore, the thickness of the first sealing segment and the third sealing segment after compression deformation is 50% of that before compression; and the bending angle is 90°.

[0016] The technical solution of the utility model can achieve at least one of the following effects:

[0017] The utility model provides a battery structure, including a shell, a cap, a sealing ring and a supporting gasket, one end of the shell is an open end, the open end is provided with a clamping portion, an annular wall and a rolling groove, the clamping portion, the annular wall and the rolling groove together form an installation cavity, the cap is sealed in the installation cavity; the sealing ring is filled in the installation cavity to seal the gap between the cap and the shell; the clamping portion is bent inwardly to press the sealing ring on the outer end face of the cap; the rolling groove protrudes inwardly, and the supporting gasket includes a pressing portion and a supporting portion, the supporting portion is embedded in the rolling groove, the pressing portion abuts against the sealing ring to support the sealing ring and presses the sealing ring on the inner end face of the cap, which can prevent the sealing ring from collapsing, improve the sealing performance of the sealing ring, and enable the sealing ring to be fully sealed.

[0018] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0020] Figure 1 A partial structural cross-sectional view of a battery structure according to an embodiment of the utility model;

[0021] Figure 2 A cross-sectional view of a housing of an embodiment of the utility model;

[0022] Figure 3 A cross-sectional view of a sealing ring according to an embodiment of the utility model;

[0023] Figure 4 It is a cross-sectional view of a support washer according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 1-housing; 11-pressing part; 12-ring wall; 13-rolling groove;

[0026] 2-Battery cell;

[0027] 3- Blocked shots;

[0028] 4-seal ring; 41-first seal section; 42-second seal section; 43-third seal section;

[0029] 5-supporting washer; 51-tightening portion; 52-supporting portion. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] A specific embodiment of the utility model discloses a battery structure, such as Figure 1As shown, it includes a shell 1, a battery cell 2, a cap 3, a sealing ring 4 and a supporting gasket 5, one end of the shell 1 is an open end, the cap 3 is buckled on the open end of the shell 1, and the sealing ring 4 is filled between the cap 3 and the shell 1 to seal the gap between the cap 3 and the shell 1; the supporting gasket 5 is embedded in the open end to press the sealing ring 4 against the inner end surface of the cap 3; compared with the prior art, by arranging the supporting gasket 5, the sealing ring 4 can be pressed against the inner end surface of the cap 3, which can prevent the sealing ring 4 from collapsing, improve the sealing performance of the sealing ring 4, and make the sealing ring 4 fully sealed.

[0032] Preferably, the housing 1 is cylindrical; Figure 2 As shown, the open end of the shell 1 is provided with a clamping portion 11, an annular wall 12 and a rolling groove 13, and the clamping portion 11, the annular wall 12 and the rolling groove 13 together form an installation cavity, the cap 3 is sealed in the installation cavity, and the sealing ring 4 is filled in the installation cavity; the clamping portion 11 is bent inwardly, and is used to press the sealing ring 4 on the outer end face of the cap 3 to form a primary compression seal; the rolling groove 13 bulges inwardly, and the supporting gasket 5 is embedded in the rolling groove 13 and abuts against the sealing ring 4, and is used to support the sealing ring 4 and press the sealing ring 4 on the inner end face of the cap 3 to form a secondary compression seal; compared with the prior art, by providing the supporting gasket 5, the sealing ring 4 can be supported and compressed and sealed, and the section of the sealing ring 4 in contact with the supporting gasket 5 can be prevented from collapsing, resulting in ineffective compression or insufficient compression, resulting in poor sealing performance of the battery and easy leakage of electrolyte.

[0033] Preferably, if Figure 3 As shown, the sealing ring 4 includes a first sealing segment 41, a second sealing segment 42 and a third sealing segment 43. The first sealing segment 41 is opposite to the pressing portion 11. The pressing portion 11 compresses the first sealing segment 41 and causes the first sealing segment 41 to be compressed and deformed, so that the first sealing segment 41 is pressed on the outer end surface of the cap 3. The thickness of the first sealing segment 41 after compression is 50±10% of that before compression. When the thickness of the first sealing segment 41 after compression is greater than 60% of that before compression, it indicates that the first sealing segment 41 is not pressed on the outer end surface of the cap 3, which may easily cause poor airtightness; when the thickness of the first sealing segment 41 after compression is less than 40% of that before compression, it indicates that the first sealing segment 41 is over-compressed, and over-compression may easily lead to a reduction in its service life; in this embodiment, the thickness of the first sealing segment 41 after compression is 50% of that before compression, so that the first sealing segment 41 is fully compressed and deformed to form an effective seal, which can fully guarantee the sealing effect and extend its service life.

[0034] Preferably, the third sealing segment 43 is opposite to the supporting gasket 5, and the supporting gasket 5 compresses the third sealing segment 43, and causes the third sealing segment 43 to be compressed and deformed, so that the third sealing segment 43 is pressed against the inner end surface of the cap 3, and the thickness of the third sealing segment 43 after compression is 50±10% of that before compression. When the thickness of the third sealing segment 43 after compression is greater than 60% of that before compression, it indicates that the third sealing segment 43 is not fully compressed, which may easily cause the third sealing segment 43 to collapse and cause poor airtightness; when the thickness of the third sealing segment 43 after compression is less than 40% of that before compression, it indicates that the third sealing segment 43 is over-compressed, and over-compression may easily lead to a reduction in its service life; in this embodiment, the thickness of the third sealing segment 43 after compression is 50% of that before compression, so that the third sealing segment 43 is fully deformed to form effective compression, which can not only fully guarantee the sealing effect but also extend its service life.

[0035] Preferably, the second sealing section 42 is opposite to the annular wall 12 , and the second sealing section 42 is filled between the edge of the cap 3 and the annular wall 12 to form a triple seal.

[0036] Preferably, the bending angle between the clamping portion 11 and the annular wall 12 is 90±20°. When the bending angle is less than 70°, the shell 1 will easily deform and crack due to excessive bending. When the bending angle is greater than 110°, the clamping portion 11 cannot effectively compress the first sealing section 41, resulting in poor sealing effect of the first sealing section 41. In this embodiment, the bending angle between the clamping portion 11 and the annular wall 12 is preferably 90°, which can prevent the shell 1 from deforming and cracking after bending, and can effectively compress the first sealing section 41, thereby ensuring the sealing effect.

[0037] Preferably, if Figure 4 As shown, the support gasket 5 includes a tightening portion 51 and a supporting portion 52, wherein the tightening portion 51 abuts against the third sealing segment 43 and presses the third sealing segment 43 so that the third sealing segment 43 is pressed against the inner end surface of the cap 3; the cross-sectional shape of the supporting portion 52 is an arc, which can fit with the outer circumferential surface of the rolling groove 13 to prevent the tightening portion 51 from sliding and stably support the tightening portion 51; in addition, compared with the prior art in which the sealing ring 4 is directly in line contact with the rolling groove 13 when compressing the sealing ring 4, so that the rolling groove 13 is subjected to shear force, the supporting portion 52 in this embodiment is engaged with the rolling groove 13 in surface contact, thereby expanding the force-bearing surface of the rolling groove 13, reducing the force per unit area of ​​the rolling groove 13, and making the force uniform; at the same time, the force applied by the supporting portion 52 on the circumferential surface of the rolling groove 13 is in the normal direction thereof, reducing the shear force, thereby preventing the rolling groove 13 from breaking when the sealing ring 4 is compressed, thereby improving the safety of the battery.

[0038] Preferably, the thickness of the first sealing section 41 is 0.8 mm, and the thickness after compression is 0.4 mm; the thickness of the third sealing section 43 is 0.8 mm, and the thickness after compression is 0.4 mm.

[0039] Preferably, the support washer 5 is made of an elastic steel sheet; the thickness of the elastic steel sheet is 0.3-0.5 mm.

[0040] Preferably, the sealing ring 4 is made of an elastic material with reversible deformation, such as rubber, polytetrafluoroethylene, polyurethane, silicone, fluororubber, etc.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A battery structure, characterized in that: The invention comprises a shell (1), a cover cap (3), a sealing ring (4) and a supporting gasket (5); one end of the shell (1) is an open end, the open end is provided with a pressing portion (11), an annular wall (12) and a rolling groove (13); the pressing portion (11), the annular wall (12) and the rolling groove (13) together form a mounting cavity; the cover cap (3) is sealed in the mounting cavity; the sealing ring (4) is filled in the mounting cavity and is used to seal the gap between the cover cap (3) and the shell (1). The gap is sealed; the pressing portion (11) is bent inwardly to press the sealing ring (4) against the outer end surface of the cover cap (3); the rolling groove (13) is convex inwardly, and the supporting gasket (5) comprises a pressing portion (51) and a supporting portion (52), the supporting portion (52) is embedded in the rolling groove (13), and the pressing portion (51) is in contact with the sealing ring (4) to support the sealing ring (4) and press the sealing ring (4) against the inner end surface of the cover cap (3).

2. A battery structure according to claim 1, characterized in that: The sealing ring (4) comprises a first sealing section (41), a second sealing section (42) and a third sealing section (43); the first sealing section (41) is opposite to the pressing portion (11); the second sealing section (42) is opposite to the annular wall (12); and the third sealing section (43) is opposite to the supporting gasket (5).

3. A battery structure according to claim 2, characterized in that: The pressing portion (11) compresses the first sealing section (41), so that the first sealing section (41) is pressed against the outer end surface of the cap (3), thereby forming a primary seal.

4. A battery structure according to claim 3, characterized in that: The pressing portion (51) abuts against the third sealing section (43) and compresses the third sealing section (43), so that the third sealing section (43) is pressed against the inner end surface of the cap (3) to form a secondary seal.

5. A battery structure according to claim 4, characterized in that: The cross-sectional shape of the support portion (52) is arc-shaped and can fit with the outer circumferential surface of the rolling groove (13).

6. A battery structure according to claim 5, characterized in that: The first sealing section (41) is compressed and deformed after being pressed against the outer end surface of the cap (3), and the thickness of the first sealing section (41) after the compression deformation is 50±10% of the thickness before the compression.

7. A battery structure according to claim 6, characterized in that: The third sealing section (43) is compressed and deformed after being pressed onto the inner end surface of the cap (3), and the thickness of the third sealing section (43) after compression deformation is 50±10% of that before compression.

8. A battery structure according to claim 7, characterized in that: The second sealing section (42) is filled between the edge of the cap (3) and the annular wall (12), forming a triple seal.

9. A battery structure according to claim 8, characterized in that: There is a bending angle between the pressing portion (11) and the annular wall (12), and the bending angle is 90±20°.

10. A battery structure according to claim 9, characterized in that: The thickness of the first sealing section (41) and the third sealing section (43) after compression deformation is 50% of that before compression; and the bending angle is 90°.

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